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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
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| <span id="894">894</span> |
| </pre><pre class="rust "> |
| <span class="doccomment">//! Safe wrappers around functions found in libc "unistd.h" header</span> |
| |
| <span class="kw">use</span> {<span class="ident">Errno</span>, <span class="ident">Error</span>, <span class="prelude-ty">Result</span>, <span class="ident">NixPath</span>}; |
| <span class="kw">use</span> <span class="ident">fcntl</span>::{<span class="ident">fcntl</span>, <span class="ident">OFlag</span>, <span class="ident">O_CLOEXEC</span>, <span class="ident">FD_CLOEXEC</span>}; |
| <span class="kw">use</span> <span class="ident">fcntl</span>::<span class="ident">FcntlArg</span>::<span class="ident">F_SETFD</span>; |
| <span class="kw">use</span> <span class="ident">libc</span>::{<span class="self">self</span>, <span class="ident">c_char</span>, <span class="ident">c_void</span>, <span class="ident">c_int</span>, <span class="ident">c_uint</span>, <span class="ident">size_t</span>, <span class="ident">pid_t</span>, <span class="ident">off_t</span>, <span class="ident">uid_t</span>, <span class="ident">gid_t</span>, <span class="ident">mode_t</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ffi</span>::{<span class="ident">CString</span>, <span class="ident">CStr</span>, <span class="ident">OsString</span>, <span class="ident">OsStr</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">ffi</span>::{<span class="ident">OsStringExt</span>, <span class="ident">OsStrExt</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">io</span>::<span class="ident">RawFd</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>::{<span class="ident">PathBuf</span>}; |
| <span class="kw">use</span> <span class="ident">void</span>::<span class="ident">Void</span>; |
| <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">stat</span>::<span class="ident">Mode</span>; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>))]</span> |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">linux</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// Represents the successful result of calling `fork`</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When `fork` is called, the process continues execution in the parent process</span> |
| <span class="doccomment">/// and in the new child. This return type can be examined to determine whether</span> |
| <span class="doccomment">/// you are now executing in the parent process or in the child.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">ForkResult</span> { |
| <span class="ident">Parent</span> { <span class="ident">child</span>: <span class="ident">pid_t</span> }, |
| <span class="ident">Child</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">ForkResult</span> { |
| |
| <span class="doccomment">/// Return `true` if this is the child process of the `fork()`</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_child</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { |
| <span class="ident">ForkResult</span>::<span class="ident">Child</span> <span class="op">=></span> <span class="bool-val">true</span>, |
| _ <span class="op">=></span> <span class="bool-val">false</span> |
| } |
| } |
| |
| <span class="doccomment">/// Returns `true` if this is the parent process of the `fork()`</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_parent</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="op">!</span><span class="self">self</span>.<span class="ident">is_child</span>() |
| } |
| } |
| |
| <span class="doccomment">/// Create a new child process duplicating the parent process ([see</span> |
| <span class="doccomment">/// fork(2)](http://man7.org/linux/man-pages/man2/fork.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// After calling the fork system call (successfully) two processes will</span> |
| <span class="doccomment">/// be created that are identical with the exception of their pid and the</span> |
| <span class="doccomment">/// return value of this function. As an example:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```no_run</span> |
| <span class="doccomment">/// use nix::unistd::{fork, ForkResult};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// match fork() {</span> |
| <span class="doccomment">/// Ok(ForkResult::Parent { child, .. }) => {</span> |
| <span class="doccomment">/// println!("Continuing execution in parent process, new child has pid: {}", child);</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// Ok(ForkResult::Child) => println!("I'm a new child process"),</span> |
| <span class="doccomment">/// Err(e) => println!("Fork failed"),</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This will print something like the following (order indeterministic). The</span> |
| <span class="doccomment">/// thing to note is that you end up with two processes continuing execution</span> |
| <span class="doccomment">/// immediately after the fork call but with different match arms.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```text</span> |
| <span class="doccomment">/// Continuing execution in parent process, new child has pid: 1234</span> |
| <span class="doccomment">/// I'm a new child process</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fork</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">ForkResult</span><span class="op">></span> { |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">ForkResult</span>::<span class="kw-2">*</span>; |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">fork</span>() }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">res</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">res</span> { |
| <span class="number">0</span> <span class="op">=></span> <span class="ident">Child</span>, |
| <span class="ident">res</span> <span class="op">=></span> <span class="ident">Parent</span> { <span class="ident">child</span>: <span class="ident">res</span> }, |
| }) |
| } |
| |
| <span class="doccomment">/// Get the pid of this process (see</span> |
| <span class="doccomment">/// [getpid(2)](http://man7.org/linux/man-pages/man2/getpid.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Since you are running code, there is always a pid to return, so there</span> |
| <span class="doccomment">/// is no error case that needs to be handled.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">getpid</span>() <span class="op">-></span> <span class="ident">pid_t</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">getpid</span>() } |
| } |
| |
| <span class="doccomment">/// Get the pid of this processes' parent (see</span> |
| <span class="doccomment">/// [getpid(2)](http://man7.org/linux/man-pages/man2/getpid.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// There is always a parent pid to return, so there is no error case that needs</span> |
| <span class="doccomment">/// to be handled.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">getppid</span>() <span class="op">-></span> <span class="ident">pid_t</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">getppid</span>() } <span class="comment">// no error handling, according to man page: "These functions are always successful."</span> |
| } |
| |
| <span class="doccomment">/// Set a process group ID (see</span> |
| <span class="doccomment">/// [setpgid(2)](http://man7.org/linux/man-pages/man2/setpgid.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Set the process group id (PGID) of a particular process. If a pid of zero</span> |
| <span class="doccomment">/// is specified, then the pid of the calling process is used. Process groups</span> |
| <span class="doccomment">/// may be used to group together a set of processes in order for the OS to</span> |
| <span class="doccomment">/// apply some operations across the group.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// `setsid()` may be used to create a new process group.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">setpgid</span>(<span class="ident">pid</span>: <span class="ident">pid_t</span>, <span class="ident">pgid</span>: <span class="ident">pid_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">setpgid</span>(<span class="ident">pid</span>, <span class="ident">pgid</span>) }; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">getpgid</span>(<span class="ident">pid</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">pid_t</span><span class="op">></span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">pid_t</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">getpgid</span>(<span class="ident">pid</span>.<span class="ident">unwrap_or</span>(<span class="number">0</span> <span class="kw">as</span> <span class="ident">pid_t</span>)) }; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>) |
| } |
| |
| <span class="doccomment">/// Create new session and set process group id (see</span> |
| <span class="doccomment">/// [setsid(2)](http://man7.org/linux/man-pages/man2/setsid.2.html)).</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">setsid</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">pid_t</span><span class="op">></span> { |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">setsid</span>() }) |
| } |
| |
| |
| <span class="doccomment">/// Get the terminal foreground process group (see</span> |
| <span class="doccomment">/// [tcgetpgrp(3)](http://man7.org/linux/man-pages/man3/tcgetpgrp.3.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Get the group process id (GPID) of the foreground process group on the</span> |
| <span class="doccomment">/// terminal associated to file descriptor (FD).</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tcgetpgrp</span>(<span class="ident">fd</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">pid_t</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">tcgetpgrp</span>(<span class="ident">fd</span>) }; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>) |
| } |
| <span class="doccomment">/// Set the terminal foreground process group (see</span> |
| <span class="doccomment">/// [tcgetpgrp(3)](http://man7.org/linux/man-pages/man3/tcgetpgrp.3.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Get the group process id (PGID) to the foreground process group on the</span> |
| <span class="doccomment">/// terminal associated to file descriptor (FD).</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tcsetpgrp</span>(<span class="ident">fd</span>: <span class="ident">c_int</span>, <span class="ident">pgrp</span>: <span class="ident">pid_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">tcsetpgrp</span>(<span class="ident">fd</span>, <span class="ident">pgrp</span>) }; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| |
| <span class="doccomment">/// Get the group id of the calling process (see</span> |
| <span class="doccomment">///[getpgrp(3)](http://man7.org/linux/man-pages/man3/getpgrp.3p.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Get the process group id (PGID) of the calling process.</span> |
| <span class="doccomment">/// According to the man page it is always successful.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">getpgrp</span>() <span class="op">-></span> <span class="ident">pid_t</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">getpgrp</span>() } |
| } |
| |
| <span class="doccomment">/// Get the caller's thread ID (see</span> |
| <span class="doccomment">/// [gettid(2)](http://man7.org/linux/man-pages/man2/gettid.2.html).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function is only available on Linux based systems. In a single</span> |
| <span class="doccomment">/// threaded process, the main thread will have the same ID as the process. In</span> |
| <span class="doccomment">/// a multithreaded process, each thread will have a unique thread id but the</span> |
| <span class="doccomment">/// same process ID.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// No error handling is required as a thread id should always exist for any</span> |
| <span class="doccomment">/// process, even if threads are not being used.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>))]</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">gettid</span>() <span class="op">-></span> <span class="ident">pid_t</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">syscall</span>(<span class="ident">libc</span>::<span class="ident">SYS_gettid</span>) <span class="kw">as</span> <span class="ident">pid_t</span> } |
| } |
| |
| <span class="doccomment">/// Create a copy of the specified file descriptor (see</span> |
| <span class="doccomment">/// [dup(2)](http://man7.org/linux/man-pages/man2/dup.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The new file descriptor will be have a new index but refer to the same</span> |
| <span class="doccomment">/// resource as the old file descriptor and the old and new file descriptors may</span> |
| <span class="doccomment">/// be used interchangeably. The new and old file descriptor share the same</span> |
| <span class="doccomment">/// underlying resource, offset, and file status flags. The actual index used</span> |
| <span class="doccomment">/// for the file descriptor will be the lowest fd index that is available.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The two file descriptors do not share file descriptor flags (e.g. `FD_CLOEXEC`).</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dup</span>(<span class="ident">oldfd</span>: <span class="ident">RawFd</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">RawFd</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">dup</span>(<span class="ident">oldfd</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>) |
| } |
| |
| <span class="doccomment">/// Create a copy of the specified file descriptor using the specified fd (see</span> |
| <span class="doccomment">/// [dup(2)](http://man7.org/linux/man-pages/man2/dup.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function behaves similar to `dup()` except that it will try to use the</span> |
| <span class="doccomment">/// specified fd instead of allocating a new one. See the man pages for more</span> |
| <span class="doccomment">/// detail on the exact behavior of this function.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dup2</span>(<span class="ident">oldfd</span>: <span class="ident">RawFd</span>, <span class="ident">newfd</span>: <span class="ident">RawFd</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">RawFd</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">dup2</span>(<span class="ident">oldfd</span>, <span class="ident">newfd</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>) |
| } |
| |
| <span class="doccomment">/// Create a new copy of the specified file descriptor using the specified fd</span> |
| <span class="doccomment">/// and flags (see [dup(2)](http://man7.org/linux/man-pages/man2/dup.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function behaves similar to `dup2()` but allows for flags to be</span> |
| <span class="doccomment">/// specified.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dup3</span>(<span class="ident">oldfd</span>: <span class="ident">RawFd</span>, <span class="ident">newfd</span>: <span class="ident">RawFd</span>, <span class="ident">flags</span>: <span class="ident">OFlag</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">RawFd</span><span class="op">></span> { |
| <span class="ident">dup3_polyfill</span>(<span class="ident">oldfd</span>, <span class="ident">newfd</span>, <span class="ident">flags</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">dup3_polyfill</span>(<span class="ident">oldfd</span>: <span class="ident">RawFd</span>, <span class="ident">newfd</span>: <span class="ident">RawFd</span>, <span class="ident">flags</span>: <span class="ident">OFlag</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">RawFd</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="ident">oldfd</span> <span class="op">==</span> <span class="ident">newfd</span> { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">EINVAL</span>)); |
| } |
| |
| <span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">dup2</span>(<span class="ident">oldfd</span>, <span class="ident">newfd</span>)); |
| |
| <span class="kw">if</span> <span class="ident">flags</span>.<span class="ident">contains</span>(<span class="ident">O_CLOEXEC</span>) { |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=</span> <span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">F_SETFD</span>(<span class="ident">FD_CLOEXEC</span>)) { |
| <span class="kw">let</span> _ <span class="op">=</span> <span class="ident">close</span>(<span class="ident">fd</span>); |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>); |
| } |
| } |
| |
| <span class="prelude-val">Ok</span>(<span class="ident">fd</span>) |
| } |
| |
| <span class="doccomment">/// Change the current working directory of the calling process (see</span> |
| <span class="doccomment">/// [chdir(2)](http://man7.org/linux/man-pages/man2/chdir.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function may fail in a number of different scenarios. See the man</span> |
| <span class="doccomment">/// pages for additional details on possible failure cases.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">chdir</span><span class="op"><</span><span class="ident">P</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">NixPath</span><span class="op">></span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">P</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">path</span>.<span class="ident">with_nix_path</span>(<span class="op">|</span><span class="ident">cstr</span><span class="op">|</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">chdir</span>(<span class="ident">cstr</span>.<span class="ident">as_ptr</span>()) } |
| })); |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="doccomment">/// Change the current working directory of the process to the one</span> |
| <span class="doccomment">/// given as an open file descriptor (see</span> |
| <span class="doccomment">/// [fchdir(2)](http://man7.org/linux/man-pages/man2/fchdir.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function may fail in a number of different scenarios. See the man</span> |
| <span class="doccomment">/// pages for additional details on possible failure cases.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fchdir</span>(<span class="ident">dirfd</span>: <span class="ident">RawFd</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">fchdir</span>(<span class="ident">dirfd</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="doccomment">/// Creates new directory `path` with access rights `mode`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Errors</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// There are several situations where mkdir might fail:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// - current user has insufficient rights in the parent directory</span> |
| <span class="doccomment">/// - the path already exists</span> |
| <span class="doccomment">/// - the path name is too long (longer than `PATH_MAX`, usually 4096 on linux, 1024 on OS X)</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// For a full list consult </span> |
| <span class="doccomment">/// [man mkdir(2)](http://man7.org/linux/man-pages/man2/mkdir.2.html#ERRORS)</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```rust</span> |
| <span class="doccomment">/// extern crate tempdir;</span> |
| <span class="doccomment">/// extern crate nix;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// use nix::unistd;</span> |
| <span class="doccomment">/// use nix::sys::stat;</span> |
| <span class="doccomment">/// use tempdir::TempDir;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// fn main() {</span> |
| <span class="doccomment">/// let tmp_dir1 = TempDir::new("test_mkdir").unwrap();</span> |
| <span class="doccomment">/// let tmp_dir2 = tmp_dir1.path().join("new_dir");</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // create new directory and give read, write and execute rights to the owner</span> |
| <span class="doccomment">/// match unistd::mkdir(&tmp_dir2, stat::S_IRWXU) {</span> |
| <span class="doccomment">/// Ok(_) => println!("created {:?}", tmp_dir2),</span> |
| <span class="doccomment">/// Err(err) => println!("Error creating directory: {}", err),</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mkdir</span><span class="op"><</span><span class="ident">P</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">NixPath</span><span class="op">></span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">P</span>, <span class="ident">mode</span>: <span class="ident">Mode</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">path</span>.<span class="ident">with_nix_path</span>(<span class="op">|</span><span class="ident">cstr</span><span class="op">|</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">mkdir</span>(<span class="ident">cstr</span>.<span class="ident">as_ptr</span>(), <span class="ident">mode</span>.<span class="ident">bits</span>() <span class="kw">as</span> <span class="ident">mode_t</span>) } |
| })); |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="doccomment">/// Returns the current directory as a PathBuf</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Err is returned if the current user doesn't have the permission to read or search a component</span> |
| <span class="doccomment">/// of the current path.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```rust</span> |
| <span class="doccomment">/// extern crate nix;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// use nix::unistd;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// fn main() {</span> |
| <span class="doccomment">/// // assume that we are allowed to get current directory</span> |
| <span class="doccomment">/// let dir = unistd::getcwd().unwrap();</span> |
| <span class="doccomment">/// println!("The current directory is {:?}", dir);</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">getcwd</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">PathBuf</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="number">512</span>); |
| <span class="kw">loop</span> { |
| <span class="kw">unsafe</span> { |
| <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_char</span>; |
| |
| <span class="comment">// The buffer must be large enough to store the absolute pathname plus</span> |
| <span class="comment">// a terminating null byte, or else null is returned.</span> |
| <span class="comment">// To safely handle this we start with a reasonable size (512 bytes)</span> |
| <span class="comment">// and double the buffer size upon every error</span> |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">libc</span>::<span class="ident">getcwd</span>(<span class="ident">ptr</span>, <span class="ident">buf</span>.<span class="ident">capacity</span>()).<span class="ident">is_null</span>() { |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">CStr</span>::<span class="ident">from_ptr</span>(<span class="ident">buf</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">c_char</span>).<span class="ident">to_bytes</span>().<span class="ident">len</span>(); |
| <span class="ident">buf</span>.<span class="ident">set_len</span>(<span class="ident">len</span>); |
| <span class="ident">buf</span>.<span class="ident">shrink_to_fit</span>(); |
| <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">PathBuf</span>::<span class="ident">from</span>(<span class="ident">OsString</span>::<span class="ident">from_vec</span>(<span class="ident">buf</span>))); |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> <span class="ident">error</span> <span class="op">=</span> <span class="ident">Errno</span>::<span class="ident">last</span>(); |
| <span class="comment">// ERANGE means buffer was too small to store directory name</span> |
| <span class="kw">if</span> <span class="ident">error</span> <span class="op">!=</span> <span class="ident">Errno</span>::<span class="ident">ERANGE</span> { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">error</span>)); |
| } |
| } |
| |
| <span class="comment">// Trigger the internal buffer resizing logic of `Vec` by requiring</span> |
| <span class="comment">// more space than the current capacity.</span> |
| <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">capacity</span>(); |
| <span class="ident">buf</span>.<span class="ident">set_len</span>(<span class="ident">cap</span>); |
| <span class="ident">buf</span>.<span class="ident">reserve</span>(<span class="number">1</span>); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Change the ownership of the file at `path` to be owned by the specified</span> |
| <span class="doccomment">/// `owner` (user) and `group` (see</span> |
| <span class="doccomment">/// [chown(2)](http://man7.org/linux/man-pages/man2/lchown.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The owner/group for the provided path name will not be modified if `None` is</span> |
| <span class="doccomment">/// provided for that argument. Ownership change will be attempted for the path</span> |
| <span class="doccomment">/// only if `Some` owner/group is provided.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This call may fail under a number of different situations. See [the man</span> |
| <span class="doccomment">/// pages](http://man7.org/linux/man-pages/man2/lchown.2.html#ERRORS) for</span> |
| <span class="doccomment">/// additional details.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">chown</span><span class="op"><</span><span class="ident">P</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">NixPath</span><span class="op">></span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">P</span>, <span class="ident">owner</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">uid_t</span><span class="op">></span>, <span class="ident">group</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">gid_t</span><span class="op">></span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">path</span>.<span class="ident">with_nix_path</span>(<span class="op">|</span><span class="ident">cstr</span><span class="op">|</span> { |
| <span class="comment">// According to the POSIX specification, -1 is used to indicate that</span> |
| <span class="comment">// owner and group, respectively, are not to be changed. Since uid_t and</span> |
| <span class="comment">// gid_t are unsigned types, we use wrapping_sub to get '-1'.</span> |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">chown</span>(<span class="ident">cstr</span>.<span class="ident">as_ptr</span>(), |
| <span class="ident">owner</span>.<span class="ident">unwrap_or</span>((<span class="number">0</span> <span class="kw">as</span> <span class="ident">uid_t</span>).<span class="ident">wrapping_sub</span>(<span class="number">1</span>)), |
| <span class="ident">group</span>.<span class="ident">unwrap_or</span>((<span class="number">0</span> <span class="kw">as</span> <span class="ident">gid_t</span>).<span class="ident">wrapping_sub</span>(<span class="number">1</span>))) } |
| })); |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">to_exec_array</span>(<span class="ident">args</span>: <span class="kw-2">&</span>[<span class="ident">CString</span>]) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span><span class="op">></span> { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ptr</span>; |
| <span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">c_char</span>; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">args_p</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span><span class="op">></span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">as_ptr</span>()).<span class="ident">collect</span>(); |
| <span class="ident">args_p</span>.<span class="ident">push</span>(<span class="ident">ptr</span>::<span class="ident">null</span>()); |
| <span class="ident">args_p</span> |
| } |
| |
| <span class="doccomment">/// Replace the current process image with a new one (see</span> |
| <span class="doccomment">/// [exec(3)](http://man7.org/linux/man-pages/man3/exec.3.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// See the `::nix::unistd::execve` system call for additional details. `execv`</span> |
| <span class="doccomment">/// performs the same action but does not allow for customization of the</span> |
| <span class="doccomment">/// environment for the new process.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">execv</span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">CString</span>, <span class="ident">argv</span>: <span class="kw-2">&</span>[<span class="ident">CString</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Void</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">args_p</span> <span class="op">=</span> <span class="ident">to_exec_array</span>(<span class="ident">argv</span>); |
| |
| <span class="kw">unsafe</span> { |
| <span class="ident">libc</span>::<span class="ident">execv</span>(<span class="ident">path</span>.<span class="ident">as_ptr</span>(), <span class="ident">args_p</span>.<span class="ident">as_ptr</span>()) |
| }; |
| |
| <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">last</span>())) |
| } |
| |
| |
| <span class="doccomment">/// Replace the current process image with a new one (see</span> |
| <span class="doccomment">/// [execve(2)](http://man7.org/linux/man-pages/man2/execve.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The execve system call allows for another process to be "called" which will</span> |
| <span class="doccomment">/// replace the current process image. That is, this process becomes the new</span> |
| <span class="doccomment">/// command that is run. On success, this function will not return. Instead,</span> |
| <span class="doccomment">/// the new program will run until it exits.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If an error occurs, this function will return with an indication of the</span> |
| <span class="doccomment">/// cause of failure. See</span> |
| <span class="doccomment">/// [execve(2)#errors](http://man7.org/linux/man-pages/man2/execve.2.html#ERRORS)</span> |
| <span class="doccomment">/// for a list of potential problems that maight cause execv to fail.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// `::nix::unistd::execv` and `::nix::unistd::execve` take as arguments a slice</span> |
| <span class="doccomment">/// of `::std::ffi::CString`s for `args` and `env` (for `execve`). Each element</span> |
| <span class="doccomment">/// in the `args` list is an argument to the new process. Each element in the</span> |
| <span class="doccomment">/// `env` list should be a string in the form "key=value".</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">execve</span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">CString</span>, <span class="ident">args</span>: <span class="kw-2">&</span>[<span class="ident">CString</span>], <span class="ident">env</span>: <span class="kw-2">&</span>[<span class="ident">CString</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Void</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">args_p</span> <span class="op">=</span> <span class="ident">to_exec_array</span>(<span class="ident">args</span>); |
| <span class="kw">let</span> <span class="ident">env_p</span> <span class="op">=</span> <span class="ident">to_exec_array</span>(<span class="ident">env</span>); |
| |
| <span class="kw">unsafe</span> { |
| <span class="ident">libc</span>::<span class="ident">execve</span>(<span class="ident">path</span>.<span class="ident">as_ptr</span>(), <span class="ident">args_p</span>.<span class="ident">as_ptr</span>(), <span class="ident">env_p</span>.<span class="ident">as_ptr</span>()) |
| }; |
| |
| <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">last</span>())) |
| } |
| |
| <span class="doccomment">/// Replace the current process image with a new one and replicate shell `PATH`</span> |
| <span class="doccomment">/// searching behavior (see</span> |
| <span class="doccomment">/// [exec(3)](http://man7.org/linux/man-pages/man3/exec.3.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// See `::nix::unistd::execve` for additoinal details. `execvp` behaves the</span> |
| <span class="doccomment">/// same as execv except that it will examine the `PATH` environment variables</span> |
| <span class="doccomment">/// for file names not specified with a leading slash. For example, `execv`</span> |
| <span class="doccomment">/// would not work if "bash" was specified for the path argument, but `execvp`</span> |
| <span class="doccomment">/// would assuming that a bash executable was on the system `PATH`.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">execvp</span>(<span class="ident">filename</span>: <span class="kw-2">&</span><span class="ident">CString</span>, <span class="ident">args</span>: <span class="kw-2">&</span>[<span class="ident">CString</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Void</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">args_p</span> <span class="op">=</span> <span class="ident">to_exec_array</span>(<span class="ident">args</span>); |
| |
| <span class="kw">unsafe</span> { |
| <span class="ident">libc</span>::<span class="ident">execvp</span>(<span class="ident">filename</span>.<span class="ident">as_ptr</span>(), <span class="ident">args_p</span>.<span class="ident">as_ptr</span>()) |
| }; |
| |
| <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">last</span>())) |
| } |
| |
| <span class="doccomment">/// Daemonize this process by detaching from the controlling terminal (see</span> |
| <span class="doccomment">/// [daemon(3)](http://man7.org/linux/man-pages/man3/daemon.3.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When a process is launched it is typically associated with a parent and it,</span> |
| <span class="doccomment">/// in turn, by its controlling terminal/process. In order for a process to run</span> |
| <span class="doccomment">/// in the "background" it must daemonize itself by detaching itself. Under</span> |
| <span class="doccomment">/// posix, this is done by doing the following:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// 1. Parent process (this one) forks</span> |
| <span class="doccomment">/// 2. Parent process exits</span> |
| <span class="doccomment">/// 3. Child process continues to run.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// `nochdir`:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// * `nochdir = true`: The current working directory after daemonizing will</span> |
| <span class="doccomment">/// be the current working directory.</span> |
| <span class="doccomment">/// * `nochdir = false`: The current working directory after daemonizing will</span> |
| <span class="doccomment">/// be the root direcory, `/`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// `noclose`:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// * `noclose = true`: The process' current stdin, stdout, and stderr file</span> |
| <span class="doccomment">/// descriptors will remain identical after daemonizing.</span> |
| <span class="doccomment">/// * `noclose = false`: The process' stdin, stdout, and stderr will point to</span> |
| <span class="doccomment">/// `/dev/null` after daemonizing.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The underlying implementation (in libc) calls both</span> |
| <span class="doccomment">/// [fork(2)](http://man7.org/linux/man-pages/man2/fork.2.html) and</span> |
| <span class="doccomment">/// [setsid(2)](http://man7.org/linux/man-pages/man2/setsid.2.html) and, as</span> |
| <span class="doccomment">/// such, error that could be returned by either of those functions could also</span> |
| <span class="doccomment">/// show up as errors here.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">daemon</span>(<span class="ident">nochdir</span>: <span class="ident">bool</span>, <span class="ident">noclose</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">daemon</span>(<span class="ident">nochdir</span> <span class="kw">as</span> <span class="ident">c_int</span>, <span class="ident">noclose</span> <span class="kw">as</span> <span class="ident">c_int</span>) }; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="doccomment">/// Set the system host name (see</span> |
| <span class="doccomment">/// [gethostname(2)](http://man7.org/linux/man-pages/man2/gethostname.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Given a name, attempt to update the system host name to the given string.</span> |
| <span class="doccomment">/// On some systems, the host name is limited to as few as 64 bytes. An error</span> |
| <span class="doccomment">/// will be return if the name is not valid or the current process does not have</span> |
| <span class="doccomment">/// permissions to update the host name.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sethostname</span><span class="op"><</span><span class="ident">S</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">OsStr</span><span class="op">>></span>(<span class="ident">name</span>: <span class="ident">S</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="comment">// Handle some differences in type of the len arg across platforms.</span> |
| <span class="macro">cfg_if</span><span class="macro">!</span> { |
| <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"dragonfly"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"ios"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, ))]</span> { |
| <span class="kw">type</span> <span class="ident">sethostname_len_t</span> <span class="op">=</span> <span class="ident">c_int</span>; |
| } <span class="kw">else</span> { |
| <span class="kw">type</span> <span class="ident">sethostname_len_t</span> <span class="op">=</span> <span class="ident">size_t</span>; |
| } |
| } |
| <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">name</span>.<span class="ident">as_ref</span>().<span class="ident">as_bytes</span>().<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span>; |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">name</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">sethostname_len_t</span>; |
| |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">sethostname</span>(<span class="ident">ptr</span>, <span class="ident">len</span>) }; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="doccomment">/// Get the host name and store it in the provided buffer, returning a pointer</span> |
| <span class="doccomment">/// the CStr in that buffer on success (see</span> |
| <span class="doccomment">/// [gethostname(2)](http://man7.org/linux/man-pages/man2/gethostname.2.html)).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function call attempts to get the host name for the running system and</span> |
| <span class="doccomment">/// store it in a provided buffer. The buffer will be populated with bytes up</span> |
| <span class="doccomment">/// to the length of the provided slice including a NUL terminating byte. If</span> |
| <span class="doccomment">/// the hostname is longer than the length provided, no error will be provided.</span> |
| <span class="doccomment">/// The posix specification does not specify whether implementations will</span> |
| <span class="doccomment">/// null-terminate in this case, but the nix implementation will ensure that the</span> |
| <span class="doccomment">/// buffer is null terminated in this case.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```no_run</span> |
| <span class="doccomment">/// use nix::unistd;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let mut buf = [0u8; 64];</span> |
| <span class="doccomment">/// let hostname_cstr = unistd::gethostname(&mut buf).expect("Failed getting hostname");</span> |
| <span class="doccomment">/// let hostname = hostname_cstr.to_str().expect("Hostname wasn't valid UTF-8");</span> |
| <span class="doccomment">/// println!("Hostname: {}", hostname);</span> |
| <span class="doccomment">/// ```</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">gethostname</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">buffer</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">CStr</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">buffer</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_char</span>; |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">buffer</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>; |
| |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">gethostname</span>(<span class="ident">ptr</span>, <span class="ident">len</span>) }; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span>_<span class="op">|</span> { |
| <span class="ident">buffer</span>[<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>] <span class="op">=</span> <span class="number">0</span>; <span class="comment">// ensure always null-terminated</span> |
| <span class="kw">unsafe</span> { <span class="ident">CStr</span>::<span class="ident">from_ptr</span>(<span class="ident">buffer</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span>) } |
| }) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">close</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">close</span>(<span class="ident">fd</span>) }; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">read</span>(<span class="ident">fd</span>, <span class="ident">buf</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>, <span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">write</span>(<span class="ident">fd</span>, <span class="ident">buf</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_void</span>, <span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Whence</span> { |
| <span class="ident">SeekSet</span>, |
| <span class="ident">SeekCur</span>, |
| <span class="ident">SeekEnd</span>, |
| <span class="ident">SeekData</span>, |
| <span class="ident">SeekHole</span> |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Whence</span> { |
| <span class="kw">fn</span> <span class="ident">to_libc_type</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">c_int</span> { |
| <span class="kw">match</span> <span class="self">self</span> { |
| <span class="kw-2">&</span><span class="ident">Whence</span>::<span class="ident">SeekSet</span> <span class="op">=></span> <span class="ident">libc</span>::<span class="ident">SEEK_SET</span>, |
| <span class="kw-2">&</span><span class="ident">Whence</span>::<span class="ident">SeekCur</span> <span class="op">=></span> <span class="ident">libc</span>::<span class="ident">SEEK_CUR</span>, |
| <span class="kw-2">&</span><span class="ident">Whence</span>::<span class="ident">SeekEnd</span> <span class="op">=></span> <span class="ident">libc</span>::<span class="ident">SEEK_END</span>, |
| <span class="kw-2">&</span><span class="ident">Whence</span>::<span class="ident">SeekData</span> <span class="op">=></span> <span class="number">3</span>, |
| <span class="kw-2">&</span><span class="ident">Whence</span>::<span class="ident">SeekHole</span> <span class="op">=></span> <span class="number">4</span> |
| } |
| } |
| |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">lseek</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">offset</span>: <span class="ident">libc</span>::<span class="ident">off_t</span>, <span class="ident">whence</span>: <span class="ident">Whence</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">libc</span>::<span class="ident">off_t</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">lseek</span>(<span class="ident">fd</span>, <span class="ident">offset</span>, <span class="ident">whence</span>.<span class="ident">to_libc_type</span>()) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">off_t</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">lseek64</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">offset</span>: <span class="ident">libc</span>::<span class="ident">off64_t</span>, <span class="ident">whence</span>: <span class="ident">Whence</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">libc</span>::<span class="ident">off64_t</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">lseek64</span>(<span class="ident">fd</span>, <span class="ident">offset</span>, <span class="ident">whence</span>.<span class="ident">to_libc_type</span>()) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">off64_t</span>) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pipe</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">RawFd</span>, <span class="ident">RawFd</span>)<span class="op">></span> { |
| <span class="kw">unsafe</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fds</span>: [<span class="ident">c_int</span>; <span class="number">2</span>] <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>(); |
| |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pipe</span>(<span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>()); |
| |
| <span class="macro">try</span><span class="macro">!</span>(<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>)); |
| |
| <span class="prelude-val">Ok</span>((<span class="ident">fds</span>[<span class="number">0</span>], <span class="ident">fds</span>[<span class="number">1</span>])) |
| } |
| } |
| |
| <span class="comment">// libc only defines `pipe2` in `libc::notbsd`.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pipe2</span>(<span class="ident">flags</span>: <span class="ident">OFlag</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">RawFd</span>, <span class="ident">RawFd</span>)<span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fds</span>: [<span class="ident">c_int</span>; <span class="number">2</span>] <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">uninitialized</span>() }; |
| |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">pipe2</span>(<span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>(), <span class="ident">flags</span>.<span class="ident">bits</span>()) }; |
| |
| <span class="macro">try</span><span class="macro">!</span>(<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>)); |
| |
| <span class="prelude-val">Ok</span>((<span class="ident">fds</span>[<span class="number">0</span>], <span class="ident">fds</span>[<span class="number">1</span>])) |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>)))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pipe2</span>(<span class="ident">flags</span>: <span class="ident">OFlag</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">RawFd</span>, <span class="ident">RawFd</span>)<span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fds</span>: [<span class="ident">c_int</span>; <span class="number">2</span>] <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">uninitialized</span>() }; |
| |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">pipe</span>(<span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>()) }; |
| |
| <span class="macro">try</span><span class="macro">!</span>(<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>)); |
| |
| <span class="macro">try</span><span class="macro">!</span>(<span class="ident">pipe2_setflags</span>(<span class="ident">fds</span>[<span class="number">0</span>], <span class="ident">fds</span>[<span class="number">1</span>], <span class="ident">flags</span>)); |
| |
| <span class="prelude-val">Ok</span>((<span class="ident">fds</span>[<span class="number">0</span>], <span class="ident">fds</span>[<span class="number">1</span>])) |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>)))]</span> |
| <span class="kw">fn</span> <span class="ident">pipe2_setflags</span>(<span class="ident">fd1</span>: <span class="ident">RawFd</span>, <span class="ident">fd2</span>: <span class="ident">RawFd</span>, <span class="ident">flags</span>: <span class="ident">OFlag</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">use</span> <span class="ident">fcntl</span>::<span class="ident">O_NONBLOCK</span>; |
| <span class="kw">use</span> <span class="ident">fcntl</span>::<span class="ident">FcntlArg</span>::<span class="ident">F_SETFL</span>; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">res</span> <span class="op">=</span> <span class="prelude-val">Ok</span>(<span class="number">0</span>); |
| |
| <span class="kw">if</span> <span class="ident">flags</span>.<span class="ident">contains</span>(<span class="ident">O_CLOEXEC</span>) { |
| <span class="ident">res</span> <span class="op">=</span> <span class="ident">res</span> |
| .<span class="ident">and_then</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">fcntl</span>(<span class="ident">fd1</span>, <span class="ident">F_SETFD</span>(<span class="ident">FD_CLOEXEC</span>))) |
| .<span class="ident">and_then</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">fcntl</span>(<span class="ident">fd2</span>, <span class="ident">F_SETFD</span>(<span class="ident">FD_CLOEXEC</span>))); |
| } |
| |
| <span class="kw">if</span> <span class="ident">flags</span>.<span class="ident">contains</span>(<span class="ident">O_NONBLOCK</span>) { |
| <span class="ident">res</span> <span class="op">=</span> <span class="ident">res</span> |
| .<span class="ident">and_then</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">fcntl</span>(<span class="ident">fd1</span>, <span class="ident">F_SETFL</span>(<span class="ident">O_NONBLOCK</span>))) |
| .<span class="ident">and_then</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">fcntl</span>(<span class="ident">fd2</span>, <span class="ident">F_SETFL</span>(<span class="ident">O_NONBLOCK</span>))); |
| } |
| |
| <span class="kw">match</span> <span class="ident">res</span> { |
| <span class="prelude-val">Ok</span>(_) <span class="op">=></span> <span class="prelude-val">Ok</span>(()), |
| <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> { |
| <span class="kw">let</span> _ <span class="op">=</span> <span class="ident">close</span>(<span class="ident">fd1</span>); |
| <span class="kw">let</span> _ <span class="op">=</span> <span class="ident">close</span>(<span class="ident">fd2</span>); |
| <span class="prelude-val">Err</span>(<span class="ident">e</span>) |
| } |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ftruncate</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">len</span>: <span class="ident">off_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">ftruncate</span>(<span class="ident">fd</span>, <span class="ident">len</span>) }).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">isatty</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span> { |
| <span class="kw">use</span> <span class="ident">libc</span>; |
| |
| <span class="kw">unsafe</span> { |
| <span class="comment">// ENOTTY means `fd` is a valid file descriptor, but not a TTY, so</span> |
| <span class="comment">// we return `Ok(false)`</span> |
| <span class="kw">if</span> <span class="ident">libc</span>::<span class="ident">isatty</span>(<span class="ident">fd</span>) <span class="op">==</span> <span class="number">1</span> { |
| <span class="prelude-val">Ok</span>(<span class="bool-val">true</span>) |
| } <span class="kw">else</span> { |
| <span class="kw">match</span> <span class="ident">Errno</span>::<span class="ident">last</span>() { |
| <span class="ident">Errno</span>::<span class="ident">ENOTTY</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="bool-val">false</span>), |
| <span class="ident">err</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">err</span>)), |
| } |
| } |
| } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unlink</span><span class="op"><</span><span class="ident">P</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">NixPath</span><span class="op">></span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">P</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">path</span>.<span class="ident">with_nix_path</span>(<span class="op">|</span><span class="ident">cstr</span><span class="op">|</span> { |
| <span class="kw">unsafe</span> { |
| <span class="ident">libc</span>::<span class="ident">unlink</span>(<span class="ident">cstr</span>.<span class="ident">as_ptr</span>()) |
| } |
| })); |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">chroot</span><span class="op"><</span><span class="ident">P</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">NixPath</span><span class="op">></span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">P</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">path</span>.<span class="ident">with_nix_path</span>(<span class="op">|</span><span class="ident">cstr</span><span class="op">|</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">chroot</span>(<span class="ident">cstr</span>.<span class="ident">as_ptr</span>()) } |
| })); |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fsync</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">fsync</span>(<span class="ident">fd</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="comment">// `fdatasync(2) is in POSIX, but in libc it is only defined in `libc::notbsd`.</span> |
| <span class="comment">// TODO: exclude only Apple systems after https://github.com/rust-lang/libc/pull/211</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>))]</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fdatasync</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">fdatasync</span>(<span class="ident">fd</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="comment">// POSIX requires that getuid, geteuid, getgid, getegid are always successful,</span> |
| <span class="comment">// so no need to check return value or errno. See:</span> |
| <span class="comment">// - http://pubs.opengroup.org/onlinepubs/9699919799/functions/getuid.html</span> |
| <span class="comment">// - http://pubs.opengroup.org/onlinepubs/9699919799/functions/geteuid.html</span> |
| <span class="comment">// - http://pubs.opengroup.org/onlinepubs/9699919799/functions/getgid.html</span> |
| <span class="comment">// - http://pubs.opengroup.org/onlinepubs/9699919799/functions/geteuid.html</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">getuid</span>() <span class="op">-></span> <span class="ident">uid_t</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">getuid</span>() } |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">geteuid</span>() <span class="op">-></span> <span class="ident">uid_t</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">geteuid</span>() } |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">getgid</span>() <span class="op">-></span> <span class="ident">gid_t</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">getgid</span>() } |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">getegid</span>() <span class="op">-></span> <span class="ident">gid_t</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">getegid</span>() } |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">setuid</span>(<span class="ident">uid</span>: <span class="ident">uid_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">setuid</span>(<span class="ident">uid</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">setgid</span>(<span class="ident">gid</span>: <span class="ident">gid_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">setgid</span>(<span class="ident">gid</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pause</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">pause</span>() }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="comment">// Per POSIX, does not fail:</span> |
| <span class="comment">// http://pubs.opengroup.org/onlinepubs/009695399/functions/sleep.html#tag_03_705_05</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sleep</span>(<span class="ident">seconds</span>: <span class="ident">libc</span>::<span class="ident">c_uint</span>) <span class="op">-></span> <span class="ident">c_uint</span> { |
| <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">sleep</span>(<span class="ident">seconds</span>) } |
| } |
| |
| <span class="doccomment">/// Creates a regular file which persists even after process termination</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// * `template`: a path whose 6 rightmost characters must be X, e.g. /tmp/tmpfile_XXXXXX</span> |
| <span class="doccomment">/// * returns: tuple of file descriptor and filename</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Err is returned either if no temporary filename could be created or the template doesn't</span> |
| <span class="doccomment">/// end with XXXXXX</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```rust</span> |
| <span class="doccomment">/// use nix::unistd;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let fd = match unistd::mkstemp("/tmp/tempfile_XXXXXX") {</span> |
| <span class="doccomment">/// Ok((fd, path)) => {</span> |
| <span class="doccomment">/// unistd::unlink(path.as_path()).unwrap(); // flag file to be deleted at app termination</span> |
| <span class="doccomment">/// fd</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// Err(e) => panic!("mkstemp failed: {}", e)</span> |
| <span class="doccomment">/// };</span> |
| <span class="doccomment">/// // do something with fd</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mkstemp</span><span class="op"><</span><span class="ident">P</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">NixPath</span><span class="op">></span>(<span class="ident">template</span>: <span class="kw-2">&</span><span class="ident">P</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">RawFd</span>, <span class="ident">PathBuf</span>)<span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">path</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">template</span>.<span class="ident">with_nix_path</span>(<span class="op">|</span><span class="ident">path</span><span class="op">|</span> {<span class="ident">path</span>.<span class="ident">to_bytes_with_nul</span>().<span class="ident">to_owned</span>()})); |
| <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _; |
| <span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">mkstemp</span>(<span class="ident">p</span>) }; |
| <span class="kw">let</span> <span class="ident">last</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">pop</span>(); <span class="comment">// drop the trailing nul</span> |
| <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">last</span> <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="string">b'\0'</span>)); |
| <span class="kw">let</span> <span class="ident">pathname</span> <span class="op">=</span> <span class="ident">OsString</span>::<span class="ident">from_vec</span>(<span class="ident">path</span>); |
| <span class="macro">try</span><span class="macro">!</span>(<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">fd</span>)); |
| <span class="prelude-val">Ok</span>((<span class="ident">fd</span>, <span class="ident">PathBuf</span>::<span class="ident">from</span>(<span class="ident">pathname</span>))) |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>))]</span> |
| <span class="kw">mod</span> <span class="ident">linux</span> { |
| <span class="kw">use</span> <span class="ident">libc</span>::{<span class="self">self</span>, <span class="ident">uid_t</span>, <span class="ident">gid_t</span>}; |
| <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">syscall</span>::{<span class="ident">syscall</span>, <span class="ident">SYSPIVOTROOT</span>}; |
| <span class="kw">use</span> {<span class="ident">Errno</span>, <span class="prelude-ty">Result</span>, <span class="ident">NixPath</span>}; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"execvpe"</span>)]</span> |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ffi</span>::<span class="ident">CString</span>; |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pivot_root</span><span class="op"><</span><span class="ident">P1</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">NixPath</span>, <span class="ident">P2</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">NixPath</span><span class="op">></span>( |
| <span class="ident">new_root</span>: <span class="kw-2">&</span><span class="ident">P1</span>, <span class="ident">put_old</span>: <span class="kw-2">&</span><span class="ident">P2</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">new_root</span>.<span class="ident">with_nix_path</span>(<span class="op">|</span><span class="ident">new_root</span><span class="op">|</span> { |
| <span class="ident">put_old</span>.<span class="ident">with_nix_path</span>(<span class="op">|</span><span class="ident">put_old</span><span class="op">|</span> { |
| <span class="kw">unsafe</span> { |
| <span class="ident">syscall</span>(<span class="ident">SYSPIVOTROOT</span>, <span class="ident">new_root</span>.<span class="ident">as_ptr</span>(), <span class="ident">put_old</span>.<span class="ident">as_ptr</span>()) |
| } |
| }) |
| }))); |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="doccomment">/// Sets the real, effective, and saved uid.</span> |
| <span class="doccomment">/// ([see setresuid(2)](http://man7.org/linux/man-pages/man2/setresuid.2.html))</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// * `ruid`: real user id</span> |
| <span class="doccomment">/// * `euid`: effective user id</span> |
| <span class="doccomment">/// * `suid`: saved user id</span> |
| <span class="doccomment">/// * returns: Ok or libc error code.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Err is returned if the user doesn't have permission to set this UID.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">setresuid</span>(<span class="ident">ruid</span>: <span class="ident">uid_t</span>, <span class="ident">euid</span>: <span class="ident">uid_t</span>, <span class="ident">suid</span>: <span class="ident">uid_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">setresuid</span>(<span class="ident">ruid</span>, <span class="ident">euid</span>, <span class="ident">suid</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="doccomment">/// Sets the real, effective, and saved gid.</span> |
| <span class="doccomment">/// ([see setresuid(2)](http://man7.org/linux/man-pages/man2/setresuid.2.html))</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// * `rgid`: real user id</span> |
| <span class="doccomment">/// * `egid`: effective user id</span> |
| <span class="doccomment">/// * `sgid`: saved user id</span> |
| <span class="doccomment">/// * returns: Ok or libc error code.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Err is returned if the user doesn't have permission to set this GID.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">setresgid</span>(<span class="ident">rgid</span>: <span class="ident">gid_t</span>, <span class="ident">egid</span>: <span class="ident">gid_t</span>, <span class="ident">sgid</span>: <span class="ident">gid_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">setresgid</span>(<span class="ident">rgid</span>, <span class="ident">egid</span>, <span class="ident">sgid</span>) }; |
| |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"execvpe"</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">execvpe</span>(<span class="ident">filename</span>: <span class="kw-2">&</span><span class="ident">CString</span>, <span class="ident">args</span>: <span class="kw-2">&</span>[<span class="ident">CString</span>], <span class="ident">env</span>: <span class="kw-2">&</span>[<span class="ident">CString</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ptr</span>; |
| <span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">c_char</span>; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">args_p</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span><span class="op">></span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">as_ptr</span>()).<span class="ident">collect</span>(); |
| <span class="ident">args_p</span>.<span class="ident">push</span>(<span class="ident">ptr</span>::<span class="ident">null</span>()); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">env_p</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span><span class="op">></span> <span class="op">=</span> <span class="ident">env</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">as_ptr</span>()).<span class="ident">collect</span>(); |
| <span class="ident">env_p</span>.<span class="ident">push</span>(<span class="ident">ptr</span>::<span class="ident">null</span>()); |
| |
| <span class="kw">unsafe</span> { |
| <span class="kw">super</span>::<span class="ident">ffi</span>::<span class="ident">execvpe</span>(<span class="ident">filename</span>.<span class="ident">as_ptr</span>(), <span class="ident">args_p</span>.<span class="ident">as_ptr</span>(), <span class="ident">env_p</span>.<span class="ident">as_ptr</span>()) |
| }; |
| |
| <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">last</span>())) |
| } |
| } |
| </pre> |
| </section> |
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