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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">convert</span>::<span class="ident">TryInto</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</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">mem</span>::{<span class="ident">size_of</span>, <span class="ident">MaybeUninit</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">net</span>::{<span class="self">self</span>, <span class="ident">SocketAddr</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">AsRawFd</span>, <span class="ident">FromRawFd</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::<span class="ident">Duration</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">net</span>::<span class="ident">TcpKeepalive</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">sys</span>::<span class="ident">unix</span>::<span class="ident">net</span>::{<span class="ident">new_socket</span>, <span class="ident">socket_addr</span>, <span class="ident">to_socket_addr</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">&quot;openbsd&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;netbsd&quot;</span>))]</span>
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">SO_KEEPALIVE</span> <span class="kw">as</span> <span class="ident">KEEPALIVE_TIME</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">&quot;macos&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>))]</span>
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">TCP_KEEPALIVE</span> <span class="kw">as</span> <span class="ident">KEEPALIVE_TIME</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">&quot;macos&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;openbsd&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;netbsd&quot;</span>,
)))]</span>
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">TCP_KEEPIDLE</span> <span class="kw">as</span> <span class="ident">KEEPALIVE_TIME</span>;
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">TcpSocket</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">c_int</span>;
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new_v4_socket</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">TcpSocket</span><span class="op">&gt;</span> {
<span class="ident">new_socket</span>(<span class="ident">libc</span>::<span class="ident">AF_INET</span>, <span class="ident">libc</span>::<span class="ident">SOCK_STREAM</span>)
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new_v6_socket</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">TcpSocket</span><span class="op">&gt;</span> {
<span class="ident">new_socket</span>(<span class="ident">libc</span>::<span class="ident">AF_INET6</span>, <span class="ident">libc</span>::<span class="ident">SOCK_STREAM</span>)
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">bind</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">addr</span>: <span class="ident">SocketAddr</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> (<span class="ident">raw_addr</span>, <span class="ident">raw_addr_length</span>) <span class="op">=</span> <span class="ident">socket_addr</span>(<span class="kw-2">&amp;</span><span class="ident">addr</span>);
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">bind</span>(<span class="ident">socket</span>, <span class="ident">raw_addr</span>.<span class="ident">as_ptr</span>(), <span class="ident">raw_addr_length</span>))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(())
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">connect</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">addr</span>: <span class="ident">SocketAddr</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">net</span>::<span class="ident">TcpStream</span><span class="op">&gt;</span> {
<span class="kw">let</span> (<span class="ident">raw_addr</span>, <span class="ident">raw_addr_length</span>) <span class="op">=</span> <span class="ident">socket_addr</span>(<span class="kw-2">&amp;</span><span class="ident">addr</span>);
<span class="kw">match</span> <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">connect</span>(<span class="ident">socket</span>, <span class="ident">raw_addr</span>.<span class="ident">as_ptr</span>(), <span class="ident">raw_addr_length</span>)) {
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="kw">if</span> <span class="ident">err</span>.<span class="ident">raw_os_error</span>() <span class="op">!</span><span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">libc</span>::<span class="ident">EINPROGRESS</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="kw">unsafe</span> { <span class="ident">net</span>::<span class="ident">TcpStream</span>::<span class="ident">from_raw_fd</span>(<span class="ident">socket</span>) }),
}
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">listen</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">backlog</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">net</span>::<span class="ident">TcpListener</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">backlog</span> <span class="op">=</span> <span class="ident">backlog</span>.<span class="ident">try_into</span>().<span class="ident">unwrap_or</span>(<span class="ident">i32</span>::<span class="ident">max_value</span>());
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">listen</span>(<span class="ident">socket</span>, <span class="ident">backlog</span>))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="kw">unsafe</span> { <span class="ident">net</span>::<span class="ident">TcpListener</span>::<span class="ident">from_raw_fd</span>(<span class="ident">socket</span>) })
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">close</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) {
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">net</span>::<span class="ident">TcpStream</span>::<span class="ident">from_raw_fd</span>(<span class="ident">socket</span>) };
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">set_reuseaddr</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">reuseaddr</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">val</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">reuseaddr</span> { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">0</span> };
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_REUSEADDR</span>,
<span class="kw-2">&amp;</span><span class="ident">val</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_int</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_void</span>,
<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>,
))
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_reuseaddr</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optval</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optlen</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_REUSEADDR</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optval</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optlen</span>,
))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">optval</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">unix</span>, <span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;solaris&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;illumos&quot;</span>))))]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">set_reuseport</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">reuseport</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">val</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">reuseport</span> { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">0</span> };
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_REUSEPORT</span>,
<span class="kw-2">&amp;</span><span class="ident">val</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_int</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_void</span>,
<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>,
))
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">unix</span>, <span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;solaris&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;illumos&quot;</span>))))]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_reuseport</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optval</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optlen</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_REUSEPORT</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optval</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optlen</span>,
))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">optval</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span>)
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_localaddr</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">SocketAddr</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">addr</span>: <span class="ident">libc</span>::<span class="ident">sockaddr_storage</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">zeroed</span>() };
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">length</span> <span class="op">=</span> <span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">sockaddr_storage</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockname</span>(
<span class="ident">socket</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">addr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">length</span>
))<span class="question-mark">?</span>;
<span class="kw">unsafe</span> { <span class="ident">to_socket_addr</span>(<span class="kw-2">&amp;</span><span class="ident">addr</span>) }
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">set_linger</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">dur</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">val</span>: <span class="ident">libc</span>::<span class="ident">linger</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">linger</span> {
<span class="ident">l_onoff</span>: <span class="kw">if</span> <span class="ident">dur</span>.<span class="ident">is_some</span>() { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">0</span> },
<span class="ident">l_linger</span>: <span class="ident">dur</span>
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">dur</span><span class="op">|</span> <span class="ident">dur</span>.<span class="ident">as_secs</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_int</span>)
.<span class="ident">unwrap_or_default</span>(),
};
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">&quot;apple&quot;</span>)]</span>
<span class="ident">libc</span>::<span class="ident">SO_LINGER_SEC</span>,
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">&quot;apple&quot;</span>))]</span>
<span class="ident">libc</span>::<span class="ident">SO_LINGER</span>,
<span class="kw-2">&amp;</span><span class="ident">val</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">linger</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_void</span>,
<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">linger</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>,
))
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_linger</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">val</span>: <span class="ident">libc</span>::<span class="ident">linger</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">zeroed</span>() };
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">linger</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">&quot;apple&quot;</span>)]</span>
<span class="ident">libc</span>::<span class="ident">SO_LINGER_SEC</span>,
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">&quot;apple&quot;</span>))]</span>
<span class="ident">libc</span>::<span class="ident">SO_LINGER</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">val</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">len</span>,
))<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="ident">val</span>.<span class="ident">l_onoff</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">Duration</span>::<span class="ident">from_secs</span>(<span class="ident">val</span>.<span class="ident">l_linger</span> <span class="kw">as</span> <span class="ident">u64</span>)))
}
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">set_recv_buffer_size</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">size</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">size</span>.<span class="ident">try_into</span>().<span class="ident">ok</span>().<span class="ident">unwrap_or_else</span>(<span class="ident">i32</span>::<span class="ident">max_value</span>);
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_RCVBUF</span>,
<span class="kw-2">&amp;</span><span class="ident">size</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</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_void</span>,
<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>
))
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_recv_buffer_size</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optval</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optlen</span> <span class="op">=</span> <span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_RCVBUF</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optval</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optlen</span>,
))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">optval</span> <span class="kw">as</span> <span class="ident">u32</span>)
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">set_send_buffer_size</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">size</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">size</span>.<span class="ident">try_into</span>().<span class="ident">ok</span>().<span class="ident">unwrap_or_else</span>(<span class="ident">i32</span>::<span class="ident">max_value</span>);
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_SNDBUF</span>,
<span class="kw-2">&amp;</span><span class="ident">size</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</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_void</span>,
<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>
))
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_send_buffer_size</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optval</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optlen</span> <span class="op">=</span> <span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_SNDBUF</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optval</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optlen</span>,
))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">optval</span> <span class="kw">as</span> <span class="ident">u32</span>)
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">set_keepalive</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">keepalive</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">val</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">keepalive</span> { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">0</span> };
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_KEEPALIVE</span>,
<span class="kw-2">&amp;</span><span class="ident">val</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</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_void</span>,
<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>
))
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_keepalive</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optval</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optlen</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>,
<span class="ident">libc</span>::<span class="ident">SO_KEEPALIVE</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optval</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optlen</span>,
))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">optval</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span>)
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">set_keepalive_params</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">keepalive</span>: <span class="ident">TcpKeepalive</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">dur</span>) <span class="op">=</span> <span class="ident">keepalive</span>.<span class="ident">time</span> {
<span class="ident">set_keepalive_time</span>(<span class="ident">socket</span>, <span class="ident">dur</span>)<span class="question-mark">?</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">&quot;linux&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;freebsd&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;netbsd&quot;</span>,
))]</span>
{
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">dur</span>) <span class="op">=</span> <span class="ident">keepalive</span>.<span class="ident">interval</span> {
<span class="ident">set_keepalive_interval</span>(<span class="ident">socket</span>, <span class="ident">dur</span>)<span class="question-mark">?</span>;
}
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">retries</span>) <span class="op">=</span> <span class="ident">keepalive</span>.<span class="ident">retries</span> {
<span class="ident">set_keepalive_retries</span>(<span class="ident">socket</span>, <span class="ident">retries</span>)<span class="question-mark">?</span>;
}
}
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">set_keepalive_time</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">time</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">time_secs</span> <span class="op">=</span> <span class="ident">time</span>
.<span class="ident">as_secs</span>()
.<span class="ident">try_into</span>()
.<span class="ident">ok</span>()
.<span class="ident">unwrap_or_else</span>(<span class="ident">i32</span>::<span class="ident">max_value</span>);
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">IPPROTO_TCP</span>,
<span class="ident">KEEPALIVE_TIME</span>,
<span class="kw-2">&amp;</span>(<span class="ident">time_secs</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</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_void</span>,
<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>
))
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_keepalive_time</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">get_keepalive</span>(<span class="ident">socket</span>)<span class="question-mark">?</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>);
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optval</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optlen</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">IPPROTO_TCP</span>,
<span class="ident">KEEPALIVE_TIME</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optval</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optlen</span>,
))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">Duration</span>::<span class="ident">from_secs</span>(<span class="ident">optval</span> <span class="kw">as</span> <span class="ident">u64</span>)))
}
<span class="doccomment">/// Linux, FreeBSD, and NetBSD support setting the keepalive interval via</span>
<span class="doccomment">/// `TCP_KEEPINTVL`.</span>
<span class="doccomment">/// See:</span>
<span class="doccomment">/// - https://man7.org/linux/man-pages/man7/tcp.7.html</span>
<span class="doccomment">/// - https://www.freebsd.org/cgi/man.cgi?query=tcp#end</span>
<span class="doccomment">/// - http://man.netbsd.org/tcp.4#DESCRIPTION</span>
<span class="doccomment">///</span>
<span class="doccomment">/// OpenBSD does not:</span>
<span class="doccomment">/// https://man.openbsd.org/tcp</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">&quot;linux&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;freebsd&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;netbsd&quot;</span>,
))]</span>
<span class="kw">fn</span> <span class="ident">set_keepalive_interval</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">interval</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">interval_secs</span> <span class="op">=</span> <span class="ident">interval</span>
.<span class="ident">as_secs</span>()
.<span class="ident">try_into</span>()
.<span class="ident">ok</span>()
.<span class="ident">unwrap_or_else</span>(<span class="ident">i32</span>::<span class="ident">max_value</span>);
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">IPPROTO_TCP</span>,
<span class="ident">libc</span>::<span class="ident">TCP_KEEPINTVL</span>,
<span class="kw-2">&amp;</span>(<span class="ident">interval_secs</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</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_void</span>,
<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>
))
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</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">&quot;linux&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;freebsd&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;netbsd&quot;</span>,
))]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_keepalive_interval</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">get_keepalive</span>(<span class="ident">socket</span>)<span class="question-mark">?</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>);
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optval</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optlen</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">IPPROTO_TCP</span>,
<span class="ident">libc</span>::<span class="ident">TCP_KEEPINTVL</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optval</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optlen</span>,
))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">Duration</span>::<span class="ident">from_secs</span>(<span class="ident">optval</span> <span class="kw">as</span> <span class="ident">u64</span>)))
}
<span class="doccomment">/// Linux, macOS/iOS, FreeBSD, and NetBSD support setting the number of TCP</span>
<span class="doccomment">/// keepalive retries via `TCP_KEEPCNT`.</span>
<span class="doccomment">/// See:</span>
<span class="doccomment">/// - https://man7.org/linux/man-pages/man7/tcp.7.html</span>
<span class="doccomment">/// - https://www.freebsd.org/cgi/man.cgi?query=tcp#end</span>
<span class="doccomment">/// - http://man.netbsd.org/tcp.4#DESCRIPTION</span>
<span class="doccomment">///</span>
<span class="doccomment">/// OpenBSD does not:</span>
<span class="doccomment">/// https://man.openbsd.org/tcp</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">&quot;linux&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;freebsd&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;netbsd&quot;</span>,
))]</span>
<span class="kw">fn</span> <span class="ident">set_keepalive_retries</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>, <span class="ident">retries</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">retries</span> <span class="op">=</span> <span class="ident">retries</span>.<span class="ident">try_into</span>().<span class="ident">ok</span>().<span class="ident">unwrap_or_else</span>(<span class="ident">i32</span>::<span class="ident">max_value</span>);
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">setsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">IPPROTO_TCP</span>,
<span class="ident">libc</span>::<span class="ident">TCP_KEEPCNT</span>,
<span class="kw-2">&amp;</span>(<span class="ident">retries</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</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_void</span>,
<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>
))
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</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">&quot;linux&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;freebsd&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;netbsd&quot;</span>,
))]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_keepalive_retries</span>(<span class="ident">socket</span>: <span class="ident">TcpSocket</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">get_keepalive</span>(<span class="ident">socket</span>)<span class="question-mark">?</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>);
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optval</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">optlen</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">c_int</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">getsockopt</span>(
<span class="ident">socket</span>,
<span class="ident">libc</span>::<span class="ident">IPPROTO_TCP</span>,
<span class="ident">libc</span>::<span class="ident">TCP_KEEPCNT</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optval</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">optlen</span>,
))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">optval</span> <span class="kw">as</span> <span class="ident">u32</span>))
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">accept</span>(<span class="ident">listener</span>: <span class="kw-2">&amp;</span><span class="ident">net</span>::<span class="ident">TcpListener</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>(<span class="ident">net</span>::<span class="ident">TcpStream</span>, <span class="ident">SocketAddr</span>)<span class="op">&gt;</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">addr</span>: <span class="ident">MaybeUninit</span><span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">sockaddr_storage</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">MaybeUninit</span>::<span class="ident">uninit</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">length</span> <span class="op">=</span> <span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">sockaddr_storage</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>;
<span class="comment">// On platforms that support it we can use `accept4(2)` to set `NONBLOCK`</span>
<span class="comment">// and `CLOEXEC` in the call to accept the connection.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(
<span class="comment">// Android x86&#39;s seccomp profile forbids calls to `accept4(2)`</span>
<span class="comment">// See https://github.com/tokio-rs/mio/issues/1445 for details</span>
<span class="ident">all</span>(
<span class="ident">not</span>(<span class="ident">target_arch</span><span class="op">=</span><span class="string">&quot;x86&quot;</span>),
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;android&quot;</span>
),
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;dragonfly&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;freebsd&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;illumos&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;linux&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;netbsd&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;openbsd&quot;</span>
))]</span>
<span class="kw">let</span> <span class="ident">stream</span> <span class="op">=</span> {
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">accept4</span>(
<span class="ident">listener</span>.<span class="ident">as_raw_fd</span>(),
<span class="ident">addr</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">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">length</span>,
<span class="ident">libc</span>::<span class="ident">SOCK_CLOEXEC</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">SOCK_NONBLOCK</span>,
))
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">socket</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">net</span>::<span class="ident">TcpStream</span>::<span class="ident">from_raw_fd</span>(<span class="ident">socket</span>) })
}<span class="question-mark">?</span>;
<span class="comment">// But not all platforms have the `accept4(2)` call. Luckily BSD (derived)</span>
<span class="comment">// OSes inherit the non-blocking flag from the listener, so we just have to</span>
<span class="comment">// set `CLOEXEC`.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(
<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;android&quot;</span>),
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>,
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;solaris&quot;</span>
))]</span>
<span class="kw">let</span> <span class="ident">stream</span> <span class="op">=</span> {
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">accept</span>(
<span class="ident">listener</span>.<span class="ident">as_raw_fd</span>(),
<span class="ident">addr</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">_</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">length</span>
))
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">socket</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">net</span>::<span class="ident">TcpStream</span>::<span class="ident">from_raw_fd</span>(<span class="ident">socket</span>) })
.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> {
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">fcntl</span>(<span class="ident">s</span>.<span class="ident">as_raw_fd</span>(), <span class="ident">libc</span>::<span class="ident">F_SETFD</span>, <span class="ident">libc</span>::<span class="ident">FD_CLOEXEC</span>))<span class="question-mark">?</span>;
<span class="comment">// See https://github.com/tokio-rs/mio/issues/1450</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;android&quot;</span>))]</span>
<span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">fcntl</span>(<span class="ident">s</span>.<span class="ident">as_raw_fd</span>(), <span class="ident">libc</span>::<span class="ident">F_SETFL</span>, <span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span>))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">s</span>)
})
}<span class="question-mark">?</span>;
<span class="comment">// This is safe because `accept` calls above ensures the address</span>
<span class="comment">// initialised.</span>
<span class="kw">unsafe</span> { <span class="ident">to_socket_addr</span>(<span class="ident">addr</span>.<span class="ident">as_ptr</span>()) }.<span class="ident">map</span>(<span class="op">|</span><span class="ident">addr</span><span class="op">|</span> (<span class="ident">stream</span>, <span class="ident">addr</span>))
}
</pre></div>
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