1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![allow(missing_docs, bad_style)]
14 use ffi::{OsStr, OsString};
15 use io::{self, ErrorKind};
16 use os::windows::ffi::{OsStrExt, OsStringExt};
20 #[macro_use] pub mod compat;
29 pub mod fast_thread_local;
42 pub mod stack_overflow;
52 pub fn decode_error_kind(errno: i32) -> ErrorKind {
53 match errno as c::DWORD {
54 c::ERROR_ACCESS_DENIED => return ErrorKind::PermissionDenied,
55 c::ERROR_ALREADY_EXISTS => return ErrorKind::AlreadyExists,
56 c::ERROR_FILE_EXISTS => return ErrorKind::AlreadyExists,
57 c::ERROR_BROKEN_PIPE => return ErrorKind::BrokenPipe,
58 c::ERROR_FILE_NOT_FOUND => return ErrorKind::NotFound,
59 c::ERROR_PATH_NOT_FOUND => return ErrorKind::NotFound,
60 c::ERROR_NO_DATA => return ErrorKind::BrokenPipe,
61 c::ERROR_OPERATION_ABORTED => return ErrorKind::TimedOut,
66 c::WSAEACCES => ErrorKind::PermissionDenied,
67 c::WSAEADDRINUSE => ErrorKind::AddrInUse,
68 c::WSAEADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
69 c::WSAECONNABORTED => ErrorKind::ConnectionAborted,
70 c::WSAECONNREFUSED => ErrorKind::ConnectionRefused,
71 c::WSAECONNRESET => ErrorKind::ConnectionReset,
72 c::WSAEINVAL => ErrorKind::InvalidInput,
73 c::WSAENOTCONN => ErrorKind::NotConnected,
74 c::WSAEWOULDBLOCK => ErrorKind::WouldBlock,
75 c::WSAETIMEDOUT => ErrorKind::TimedOut,
77 _ => ErrorKind::Other,
81 pub fn to_u16s<S: AsRef<OsStr>>(s: S) -> io::Result<Vec<u16>> {
82 fn inner(s: &OsStr) -> io::Result<Vec<u16>> {
83 let mut maybe_result: Vec<u16> = s.encode_wide().collect();
84 if maybe_result.iter().any(|&u| u == 0) {
85 return Err(io::Error::new(io::ErrorKind::InvalidInput,
86 "strings passed to WinAPI cannot contain NULs"));
94 // Many Windows APIs follow a pattern of where we hand a buffer and then they
95 // will report back to us how large the buffer should be or how many bytes
96 // currently reside in the buffer. This function is an abstraction over these
97 // functions by making them easier to call.
99 // The first callback, `f1`, is yielded a (pointer, len) pair which can be
100 // passed to a syscall. The `ptr` is valid for `len` items (u16 in this case).
101 // The closure is expected to return what the syscall returns which will be
102 // interpreted by this function to determine if the syscall needs to be invoked
103 // again (with more buffer space).
105 // Once the syscall has completed (errors bail out early) the second closure is
106 // yielded the data which has been read from the syscall. The return value
107 // from this closure is then the return value of the function.
108 fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> io::Result<T>
109 where F1: FnMut(*mut u16, c::DWORD) -> c::DWORD,
110 F2: FnOnce(&[u16]) -> T
112 // Start off with a stack buf but then spill over to the heap if we end up
113 // needing more space.
114 let mut stack_buf = [0u16; 512];
115 let mut heap_buf = Vec::new();
117 let mut n = stack_buf.len();
119 let buf = if n <= stack_buf.len() {
122 let extra = n - heap_buf.len();
123 heap_buf.reserve(extra);
128 // This function is typically called on windows API functions which
129 // will return the correct length of the string, but these functions
130 // also return the `0` on error. In some cases, however, the
131 // returned "correct length" may actually be 0!
133 // To handle this case we call `SetLastError` to reset it to 0 and
134 // then check it again if we get the "0 error value". If the "last
135 // error" is still 0 then we interpret it as a 0 length buffer and
136 // not an actual error.
138 let k = match f1(buf.as_mut_ptr(), n as c::DWORD) {
139 0 if c::GetLastError() == 0 => 0,
140 0 => return Err(io::Error::last_os_error()),
143 if k == n && c::GetLastError() == c::ERROR_INSUFFICIENT_BUFFER {
148 return Ok(f2(&buf[..k]))
154 fn os2path(s: &[u16]) -> PathBuf {
155 PathBuf::from(OsString::from_wide(s))
158 #[allow(dead_code)] // Only used in backtrace::gnu::get_executable_filename()
159 fn wide_char_to_multi_byte(code_page: u32,
162 no_default_char: bool)
163 -> io::Result<Vec<i8>> {
165 let mut size = c::WideCharToMultiByte(code_page,
174 return Err(io::Error::last_os_error());
177 let mut buf = Vec::with_capacity(size as usize);
178 buf.set_len(size as usize);
180 let mut used_default_char = c::FALSE;
181 size = c::WideCharToMultiByte(code_page,
188 if no_default_char { &mut used_default_char }
189 else { ptr::null_mut() });
191 return Err(io::Error::last_os_error());
193 if no_default_char && used_default_char == c::TRUE {
194 return Err(io::Error::new(io::ErrorKind::InvalidData,
195 "string cannot be converted to requested code page"));
198 buf.set_len(size as usize);
204 pub fn truncate_utf16_at_nul<'a>(v: &'a [u16]) -> &'a [u16] {
205 match v.iter().position(|c| *c == 0) {
206 // don't include the 0
213 fn is_zero(&self) -> bool;
216 macro_rules! impl_is_zero {
217 ($($t:ident)*) => ($(impl IsZero for $t {
218 fn is_zero(&self) -> bool {
224 impl_is_zero! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }
226 pub fn cvt<I: IsZero>(i: I) -> io::Result<I> {
228 Err(io::Error::last_os_error())
234 pub fn dur2timeout(dur: Duration) -> c::DWORD {
235 // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
236 // timeouts in windows APIs are typically u32 milliseconds. To translate, we
237 // have two pieces to take care of:
239 // * Nanosecond precision is rounded up
240 // * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
242 dur.as_secs().checked_mul(1000).and_then(|ms| {
243 ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000)
245 ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 {1} else {0})
247 if ms > <c::DWORD>::max_value() as u64 {
252 }).unwrap_or(c::INFINITE)
255 // On Windows, use the processor-specific __fastfail mechanism. In Windows 8
256 // and later, this will terminate the process immediately without running any
257 // in-process exception handlers. In earlier versions of Windows, this
258 // sequence of instructions will be treated as an access violation,
259 // terminating the process but without necessarily bypassing all exception
262 // https://msdn.microsoft.com/en-us/library/dn774154.aspx
263 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
264 pub unsafe fn abort_internal() -> ! {
265 asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT
266 ::intrinsics::unreachable();