src/libstd/sys/windows/mod.rs - third_party/rust - Git at Google

 #![allow(missing_docs, nonstandard_style)]

 use crate::ffi::{OsStr, OsString};
 use crate::io::ErrorKind;
 use crate::os::windows::ffi::{OsStrExt, OsStringExt};
 use crate::path::PathBuf;
 use crate::ptr;
 use crate::time::Duration;

 pub use self::rand::hashmap_random_keys;
 pub use libc::strlen;

 #[macro_use]
 pub mod compat;

 pub mod alloc;
 pub mod args;
 pub mod c;
 pub mod cmath;
 pub mod condvar;
 pub mod env;
 pub mod ext;
 pub mod fast_thread_local;
 pub mod fs;
 pub mod handle;
 pub mod io;
 pub mod memchr;
 pub mod mutex;
 pub mod net;
 pub mod os;
 pub mod os_str;
 pub mod path;
 pub mod pipe;
 pub mod process;
 pub mod rand;
 pub mod rwlock;
 pub mod thread;
 pub mod thread_local;
 pub mod time;
 cfg_if::cfg_if! {
     if #[cfg(not(target_vendor = "uwp"))] {
         pub mod stdio;
         pub mod stack_overflow;
     } else {
         pub mod stdio_uwp;
         pub mod stack_overflow_uwp;
         pub use self::stdio_uwp as stdio;
         pub use self::stack_overflow_uwp as stack_overflow;
     }
 }

 #[cfg(not(test))]
 pub fn init() {}

 pub fn decode_error_kind(errno: i32) -> ErrorKind {
     match errno as c::DWORD {
         c::ERROR_ACCESS_DENIED => return ErrorKind::PermissionDenied,
         c::ERROR_ALREADY_EXISTS => return ErrorKind::AlreadyExists,
         c::ERROR_FILE_EXISTS => return ErrorKind::AlreadyExists,
         c::ERROR_BROKEN_PIPE => return ErrorKind::BrokenPipe,
         c::ERROR_FILE_NOT_FOUND => return ErrorKind::NotFound,
         c::ERROR_PATH_NOT_FOUND => return ErrorKind::NotFound,
         c::ERROR_NO_DATA => return ErrorKind::BrokenPipe,
         c::ERROR_OPERATION_ABORTED => return ErrorKind::TimedOut,
         _ => {}
     }

     match errno {
         c::WSAEACCES => ErrorKind::PermissionDenied,
         c::WSAEADDRINUSE => ErrorKind::AddrInUse,
         c::WSAEADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
         c::WSAECONNABORTED => ErrorKind::ConnectionAborted,
         c::WSAECONNREFUSED => ErrorKind::ConnectionRefused,
         c::WSAECONNRESET => ErrorKind::ConnectionReset,
         c::WSAEINVAL => ErrorKind::InvalidInput,
         c::WSAENOTCONN => ErrorKind::NotConnected,
         c::WSAEWOULDBLOCK => ErrorKind::WouldBlock,
         c::WSAETIMEDOUT => ErrorKind::TimedOut,

         _ => ErrorKind::Other,
     }
 }

 pub fn to_u16s<S: AsRef<OsStr>>(s: S) -> crate::io::Result<Vec<u16>> {
     fn inner(s: &OsStr) -> crate::io::Result<Vec<u16>> {
         let mut maybe_result: Vec<u16> = s.encode_wide().collect();
         if maybe_result.iter().any(|&u| u == 0) {
             return Err(crate::io::Error::new(
                 ErrorKind::InvalidInput,
                 "strings passed to WinAPI cannot contain NULs",
             ));
         }
         maybe_result.push(0);
         Ok(maybe_result)
     }
     inner(s.as_ref())
 }

 // Many Windows APIs follow a pattern of where we hand a buffer and then they
 // will report back to us how large the buffer should be or how many bytes
 // currently reside in the buffer. This function is an abstraction over these
 // functions by making them easier to call.
 //
 // The first callback, `f1`, is yielded a (pointer, len) pair which can be
 // passed to a syscall. The `ptr` is valid for `len` items (u16 in this case).
 // The closure is expected to return what the syscall returns which will be
 // interpreted by this function to determine if the syscall needs to be invoked
 // again (with more buffer space).
 //
 // Once the syscall has completed (errors bail out early) the second closure is
 // yielded the data which has been read from the syscall. The return value
 // from this closure is then the return value of the function.
 fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> crate::io::Result<T>
 where
     F1: FnMut(*mut u16, c::DWORD) -> c::DWORD,
     F2: FnOnce(&[u16]) -> T,
 {
     // Start off with a stack buf but then spill over to the heap if we end up
     // needing more space.
     let mut stack_buf = [0u16; 512];
     let mut heap_buf = Vec::new();
     unsafe {
         let mut n = stack_buf.len();
         loop {
             let buf = if n <= stack_buf.len() {
                 &mut stack_buf[..]
             } else {
                 let extra = n - heap_buf.len();
                 heap_buf.reserve(extra);
                 heap_buf.set_len(n);
                 &mut heap_buf[..]
             };

             // This function is typically called on windows API functions which
             // will return the correct length of the string, but these functions
             // also return the `0` on error. In some cases, however, the
             // returned "correct length" may actually be 0!
             //
             // To handle this case we call `SetLastError` to reset it to 0 and
             // then check it again if we get the "0 error value". If the "last
             // error" is still 0 then we interpret it as a 0 length buffer and
             // not an actual error.
             c::SetLastError(0);
             let k = match f1(buf.as_mut_ptr(), n as c::DWORD) {
                 0 if c::GetLastError() == 0 => 0,
                 0 => return Err(crate::io::Error::last_os_error()),
                 n => n,
             } as usize;
             if k == n && c::GetLastError() == c::ERROR_INSUFFICIENT_BUFFER {
                 n *= 2;
             } else if k >= n {
                 n = k;
             } else {
                 return Ok(f2(&buf[..k]));
             }
         }
     }
 }

 fn os2path(s: &[u16]) -> PathBuf {
     PathBuf::from(OsString::from_wide(s))
 }

 #[allow(dead_code)] // Only used in backtrace::gnu::get_executable_filename()
 fn wide_char_to_multi_byte(
     code_page: u32,
     flags: u32,
     s: &[u16],
     no_default_char: bool,
 ) -> crate::io::Result<Vec<i8>> {
     unsafe {
         let mut size = c::WideCharToMultiByte(
             code_page,
             flags,
             s.as_ptr(),
             s.len() as i32,
             ptr::null_mut(),
             0,
             ptr::null(),
             ptr::null_mut(),
         );
         if size == 0 {
             return Err(crate::io::Error::last_os_error());
         }

         let mut buf = Vec::with_capacity(size as usize);
         buf.set_len(size as usize);

         let mut used_default_char = c::FALSE;
         size = c::WideCharToMultiByte(
             code_page,
             flags,
             s.as_ptr(),
             s.len() as i32,
             buf.as_mut_ptr(),
             buf.len() as i32,
             ptr::null(),
             if no_default_char { &mut used_default_char } else { ptr::null_mut() },
         );
         if size == 0 {
             return Err(crate::io::Error::last_os_error());
         }
         if no_default_char && used_default_char == c::TRUE {
             return Err(crate::io::Error::new(
                 crate::io::ErrorKind::InvalidData,
                 "string cannot be converted to requested code page",
             ));
         }

         buf.set_len(size as usize);

         Ok(buf)
     }
 }

 pub fn truncate_utf16_at_nul(v: &[u16]) -> &[u16] {
     match v.iter().position(|c| *c == 0) {
         // don't include the 0
         Some(i) => &v[..i],
         None => v,
     }
 }

 pub trait IsZero {
     fn is_zero(&self) -> bool;
 }

 macro_rules! impl_is_zero {
     ($($t:ident)*) => ($(impl IsZero for $t {
         fn is_zero(&self) -> bool {
             *self == 0
         }
     })*)
 }

 impl_is_zero! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }

 pub fn cvt<I: IsZero>(i: I) -> crate::io::Result<I> {
     if i.is_zero() { Err(crate::io::Error::last_os_error()) } else { Ok(i) }
 }

 pub fn dur2timeout(dur: Duration) -> c::DWORD {
     // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
     // timeouts in windows APIs are typically u32 milliseconds. To translate, we
     // have two pieces to take care of:
     //
     // * Nanosecond precision is rounded up
     // * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
     //   (never time out).
     dur.as_secs()
         .checked_mul(1000)
         .and_then(|ms| ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000))
         .and_then(|ms| ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 { 1 } else { 0 }))
         .map(|ms| if ms > <c::DWORD>::max_value() as u64 { c::INFINITE } else { ms as c::DWORD })
         .unwrap_or(c::INFINITE)
 }

 // On Windows, use the processor-specific __fastfail mechanism.  In Windows 8
 // and later, this will terminate the process immediately without running any
 // in-process exception handlers.  In earlier versions of Windows, this
 // sequence of instructions will be treated as an access violation,
 // terminating the process but without necessarily bypassing all exception
 // handlers.
 //
 // https://docs.microsoft.com/en-us/cpp/intrinsics/fastfail
 #[allow(unreachable_code)]
 pub unsafe fn abort_internal() -> ! {
     #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
     {
         asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT
         crate::intrinsics::unreachable();
     }
     crate::intrinsics::abort();
 }
	#![allow(missing_docs, nonstandard_style)]

	use crate::ffi::{OsStr, OsString};
	use crate::io::ErrorKind;
	use crate::os::windows::ffi::{OsStrExt, OsStringExt};
	use crate::path::PathBuf;
	use crate::ptr;
	use crate::time::Duration;

	pub use self::rand::hashmap_random_keys;
	pub use libc::strlen;

	#[macro_use]
	pub mod compat;

	pub mod alloc;
	pub mod args;
	pub mod c;
	pub mod cmath;
	pub mod condvar;
	pub mod env;
	pub mod ext;
	pub mod fast_thread_local;
	pub mod fs;
	pub mod handle;
	pub mod io;
	pub mod memchr;
	pub mod mutex;
	pub mod net;
	pub mod os;
	pub mod os_str;
	pub mod path;
	pub mod pipe;
	pub mod process;
	pub mod rand;
	pub mod rwlock;
	pub mod thread;
	pub mod thread_local;
	pub mod time;
	cfg_if::cfg_if! {
	if #[cfg(not(target_vendor = "uwp"))] {
	pub mod stdio;
	pub mod stack_overflow;
	} else {
	pub mod stdio_uwp;
	pub mod stack_overflow_uwp;
	pub use self::stdio_uwp as stdio;
	pub use self::stack_overflow_uwp as stack_overflow;
	}
	}

	#[cfg(not(test))]
	pub fn init() {}

	pub fn decode_error_kind(errno: i32) -> ErrorKind {
	match errno as c::DWORD {
	c::ERROR_ACCESS_DENIED => return ErrorKind::PermissionDenied,
	c::ERROR_ALREADY_EXISTS => return ErrorKind::AlreadyExists,
	c::ERROR_FILE_EXISTS => return ErrorKind::AlreadyExists,
	c::ERROR_BROKEN_PIPE => return ErrorKind::BrokenPipe,
	c::ERROR_FILE_NOT_FOUND => return ErrorKind::NotFound,
	c::ERROR_PATH_NOT_FOUND => return ErrorKind::NotFound,
	c::ERROR_NO_DATA => return ErrorKind::BrokenPipe,
	c::ERROR_OPERATION_ABORTED => return ErrorKind::TimedOut,
	_ => {}
	}

	match errno {
	c::WSAEACCES => ErrorKind::PermissionDenied,
	c::WSAEADDRINUSE => ErrorKind::AddrInUse,
	c::WSAEADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
	c::WSAECONNABORTED => ErrorKind::ConnectionAborted,
	c::WSAECONNREFUSED => ErrorKind::ConnectionRefused,
	c::WSAECONNRESET => ErrorKind::ConnectionReset,
	c::WSAEINVAL => ErrorKind::InvalidInput,
	c::WSAENOTCONN => ErrorKind::NotConnected,
	c::WSAEWOULDBLOCK => ErrorKind::WouldBlock,
	c::WSAETIMEDOUT => ErrorKind::TimedOut,

	_ => ErrorKind::Other,
	}
	}

	pub fn to_u16s<S: AsRef<OsStr>>(s: S) -> crate::io::Result<Vec<u16>> {
	fn inner(s: &OsStr) -> crate::io::Result<Vec<u16>> {
	let mut maybe_result: Vec<u16> = s.encode_wide().collect();
	if maybe_result.iter().any(\|&u\| u == 0) {
	return Err(crate::io::Error::new(
	ErrorKind::InvalidInput,
	"strings passed to WinAPI cannot contain NULs",
	));
	}
	maybe_result.push(0);
	Ok(maybe_result)
	}
	inner(s.as_ref())
	}

	// Many Windows APIs follow a pattern of where we hand a buffer and then they
	// will report back to us how large the buffer should be or how many bytes
	// currently reside in the buffer. This function is an abstraction over these
	// functions by making them easier to call.
	//
	// The first callback, `f1`, is yielded a (pointer, len) pair which can be
	// passed to a syscall. The `ptr` is valid for `len` items (u16 in this case).
	// The closure is expected to return what the syscall returns which will be
	// interpreted by this function to determine if the syscall needs to be invoked
	// again (with more buffer space).
	//
	// Once the syscall has completed (errors bail out early) the second closure is
	// yielded the data which has been read from the syscall. The return value
	// from this closure is then the return value of the function.
	fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> crate::io::Result<T>
	where
	F1: FnMut(*mut u16, c::DWORD) -> c::DWORD,
	F2: FnOnce(&[u16]) -> T,
	{
	// Start off with a stack buf but then spill over to the heap if we end up
	// needing more space.
	let mut stack_buf = [0u16; 512];
	let mut heap_buf = Vec::new();
	unsafe {
	let mut n = stack_buf.len();
	loop {
	let buf = if n <= stack_buf.len() {
	&mut stack_buf[..]
	} else {
	let extra = n - heap_buf.len();
	heap_buf.reserve(extra);
	heap_buf.set_len(n);
	&mut heap_buf[..]
	};

	// This function is typically called on windows API functions which
	// will return the correct length of the string, but these functions
	// also return the `0` on error. In some cases, however, the
	// returned "correct length" may actually be 0!
	//
	// To handle this case we call `SetLastError` to reset it to 0 and
	// then check it again if we get the "0 error value". If the "last
	// error" is still 0 then we interpret it as a 0 length buffer and
	// not an actual error.
	c::SetLastError(0);
	let k = match f1(buf.as_mut_ptr(), n as c::DWORD) {
	0 if c::GetLastError() == 0 => 0,
	0 => return Err(crate::io::Error::last_os_error()),
	n => n,
	} as usize;
	if k == n && c::GetLastError() == c::ERROR_INSUFFICIENT_BUFFER {
	n *= 2;
	} else if k >= n {
	n = k;
	} else {
	return Ok(f2(&buf[..k]));
	}
	}
	}
	}

	fn os2path(s: &[u16]) -> PathBuf {
	PathBuf::from(OsString::from_wide(s))
	}

	#[allow(dead_code)] // Only used in backtrace::gnu::get_executable_filename()
	fn wide_char_to_multi_byte(
	code_page: u32,
	flags: u32,
	s: &[u16],
	no_default_char: bool,
	) -> crate::io::Result<Vec<i8>> {
	unsafe {
	let mut size = c::WideCharToMultiByte(
	code_page,
	flags,
	s.as_ptr(),
	s.len() as i32,
	ptr::null_mut(),
	0,
	ptr::null(),
	ptr::null_mut(),
	);
	if size == 0 {
	return Err(crate::io::Error::last_os_error());
	}

	let mut buf = Vec::with_capacity(size as usize);
	buf.set_len(size as usize);

	let mut used_default_char = c::FALSE;
	size = c::WideCharToMultiByte(
	code_page,
	flags,
	s.as_ptr(),
	s.len() as i32,
	buf.as_mut_ptr(),
	buf.len() as i32,
	ptr::null(),
	if no_default_char { &mut used_default_char } else { ptr::null_mut() },
	);
	if size == 0 {
	return Err(crate::io::Error::last_os_error());
	}
	if no_default_char && used_default_char == c::TRUE {
	return Err(crate::io::Error::new(
	crate::io::ErrorKind::InvalidData,
	"string cannot be converted to requested code page",
	));
	}

	buf.set_len(size as usize);

	Ok(buf)
	}
	}

	pub fn truncate_utf16_at_nul(v: &[u16]) -> &[u16] {
	match v.iter().position(\|c\| *c == 0) {
	// don't include the 0
	Some(i) => &v[..i],
	None => v,
	}
	}

	pub trait IsZero {
	fn is_zero(&self) -> bool;
	}

	macro_rules! impl_is_zero {
	($($t:ident)*) => ($(impl IsZero for $t {
	fn is_zero(&self) -> bool {
	*self == 0
	}
	})*)
	}

	impl_is_zero! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }

	pub fn cvt<I: IsZero>(i: I) -> crate::io::Result<I> {
	if i.is_zero() { Err(crate::io::Error::last_os_error()) } else { Ok(i) }
	}

	pub fn dur2timeout(dur: Duration) -> c::DWORD {
	// Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
	// timeouts in windows APIs are typically u32 milliseconds. To translate, we
	// have two pieces to take care of:
	//
	// * Nanosecond precision is rounded up
	// * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
	// (never time out).
	dur.as_secs()
	.checked_mul(1000)
	.and_then(\|ms\| ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000))
	.and_then(\|ms\| ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 { 1 } else { 0 }))
	.map(\|ms\| if ms > <c::DWORD>::max_value() as u64 { c::INFINITE } else { ms as c::DWORD })
	.unwrap_or(c::INFINITE)
	}

	// On Windows, use the processor-specific __fastfail mechanism. In Windows 8
	// and later, this will terminate the process immediately without running any
	// in-process exception handlers. In earlier versions of Windows, this
	// sequence of instructions will be treated as an access violation,
	// terminating the process but without necessarily bypassing all exception
	// handlers.
	//
	// https://docs.microsoft.com/en-us/cpp/intrinsics/fastfail
	#[allow(unreachable_code)]
	pub unsafe fn abort_internal() -> ! {
	#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
	{
	asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT
	crate::intrinsics::unreachable();
	}
	crate::intrinsics::abort();
	}