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;
41 pub mod stack_overflow;
49 ::alloc::oom::set_oom_handler(oom_handler);
51 // See comment in sys/unix/mod.rs
52 fn oom_handler() -> ! {
55 let msg = "fatal runtime error: out of memory\n";
57 // WriteFile silently fails if it is passed an invalid handle, so
58 // there is no need to check the result of GetStdHandle.
59 c::WriteFile(c::GetStdHandle(c::STD_ERROR_HANDLE),
60 msg.as_ptr() as c::LPVOID,
61 msg.len() as c::DWORD,
69 pub fn decode_error_kind(errno: i32) -> ErrorKind {
70 match errno as c::DWORD {
71 c::ERROR_ACCESS_DENIED => return ErrorKind::PermissionDenied,
72 c::ERROR_ALREADY_EXISTS => return ErrorKind::AlreadyExists,
73 c::ERROR_FILE_EXISTS => return ErrorKind::AlreadyExists,
74 c::ERROR_BROKEN_PIPE => return ErrorKind::BrokenPipe,
75 c::ERROR_FILE_NOT_FOUND => return ErrorKind::NotFound,
76 c::ERROR_PATH_NOT_FOUND => return ErrorKind::NotFound,
77 c::ERROR_NO_DATA => return ErrorKind::BrokenPipe,
78 c::ERROR_OPERATION_ABORTED => return ErrorKind::TimedOut,
83 c::WSAEACCES => ErrorKind::PermissionDenied,
84 c::WSAEADDRINUSE => ErrorKind::AddrInUse,
85 c::WSAEADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
86 c::WSAECONNABORTED => ErrorKind::ConnectionAborted,
87 c::WSAECONNREFUSED => ErrorKind::ConnectionRefused,
88 c::WSAECONNRESET => ErrorKind::ConnectionReset,
89 c::WSAEINVAL => ErrorKind::InvalidInput,
90 c::WSAENOTCONN => ErrorKind::NotConnected,
91 c::WSAEWOULDBLOCK => ErrorKind::WouldBlock,
92 c::WSAETIMEDOUT => ErrorKind::TimedOut,
94 _ => ErrorKind::Other,
98 pub fn to_u16s<S: AsRef<OsStr>>(s: S) -> io::Result<Vec<u16>> {
99 fn inner(s: &OsStr) -> io::Result<Vec<u16>> {
100 let mut maybe_result: Vec<u16> = s.encode_wide().collect();
101 if maybe_result.iter().any(|&u| u == 0) {
102 return Err(io::Error::new(io::ErrorKind::InvalidInput,
103 "strings passed to WinAPI cannot contain NULs"));
105 maybe_result.push(0);
111 // Many Windows APIs follow a pattern of where we hand a buffer and then they
112 // will report back to us how large the buffer should be or how many bytes
113 // currently reside in the buffer. This function is an abstraction over these
114 // functions by making them easier to call.
116 // The first callback, `f1`, is yielded a (pointer, len) pair which can be
117 // passed to a syscall. The `ptr` is valid for `len` items (u16 in this case).
118 // The closure is expected to return what the syscall returns which will be
119 // interpreted by this function to determine if the syscall needs to be invoked
120 // again (with more buffer space).
122 // Once the syscall has completed (errors bail out early) the second closure is
123 // yielded the data which has been read from the syscall. The return value
124 // from this closure is then the return value of the function.
125 fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> io::Result<T>
126 where F1: FnMut(*mut u16, c::DWORD) -> c::DWORD,
127 F2: FnOnce(&[u16]) -> T
129 // Start off with a stack buf but then spill over to the heap if we end up
130 // needing more space.
131 let mut stack_buf = [0u16; 512];
132 let mut heap_buf = Vec::new();
134 let mut n = stack_buf.len();
136 let buf = if n <= stack_buf.len() {
139 let extra = n - heap_buf.len();
140 heap_buf.reserve(extra);
145 // This function is typically called on windows API functions which
146 // will return the correct length of the string, but these functions
147 // also return the `0` on error. In some cases, however, the
148 // returned "correct length" may actually be 0!
150 // To handle this case we call `SetLastError` to reset it to 0 and
151 // then check it again if we get the "0 error value". If the "last
152 // error" is still 0 then we interpret it as a 0 length buffer and
153 // not an actual error.
155 let k = match f1(buf.as_mut_ptr(), n as c::DWORD) {
156 0 if c::GetLastError() == 0 => 0,
157 0 => return Err(io::Error::last_os_error()),
160 if k == n && c::GetLastError() == c::ERROR_INSUFFICIENT_BUFFER {
165 return Ok(f2(&buf[..k]))
171 fn os2path(s: &[u16]) -> PathBuf {
172 PathBuf::from(OsString::from_wide(s))
175 #[allow(dead_code)] // Only used in backtrace::gnu::get_executable_filename()
176 fn wide_char_to_multi_byte(code_page: u32,
179 no_default_char: bool)
180 -> io::Result<Vec<i8>> {
182 let mut size = c::WideCharToMultiByte(code_page,
191 return Err(io::Error::last_os_error());
194 let mut buf = Vec::with_capacity(size as usize);
195 buf.set_len(size as usize);
197 let mut used_default_char = c::FALSE;
198 size = c::WideCharToMultiByte(code_page,
205 if no_default_char { &mut used_default_char }
206 else { ptr::null_mut() });
208 return Err(io::Error::last_os_error());
210 if no_default_char && used_default_char == c::TRUE {
211 return Err(io::Error::new(io::ErrorKind::InvalidData,
212 "string cannot be converted to requested code page"));
215 buf.set_len(size as usize);
221 pub fn truncate_utf16_at_nul<'a>(v: &'a [u16]) -> &'a [u16] {
222 match v.iter().position(|c| *c == 0) {
223 // don't include the 0
230 fn is_zero(&self) -> bool;
233 macro_rules! impl_is_zero {
234 ($($t:ident)*) => ($(impl IsZero for $t {
235 fn is_zero(&self) -> bool {
241 impl_is_zero! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }
243 pub fn cvt<I: IsZero>(i: I) -> io::Result<I> {
245 Err(io::Error::last_os_error())
251 pub fn dur2timeout(dur: Duration) -> c::DWORD {
252 // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
253 // timeouts in windows APIs are typically u32 milliseconds. To translate, we
254 // have two pieces to take care of:
256 // * Nanosecond precision is rounded up
257 // * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
259 dur.as_secs().checked_mul(1000).and_then(|ms| {
260 ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000)
262 ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 {1} else {0})
264 if ms > <c::DWORD>::max_value() as u64 {
269 }).unwrap_or(c::INFINITE)
272 // On Windows, use the processor-specific __fastfail mechanism. In Windows 8
273 // and later, this will terminate the process immediately without running any
274 // in-process exception handlers. In earlier versions of Windows, this
275 // sequence of instructions will be treated as an access violation,
276 // terminating the process but without necessarily bypassing all exception
279 // https://msdn.microsoft.com/en-us/library/dn774154.aspx
280 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
281 pub unsafe fn abort_internal() -> ! {
282 asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT
283 ::intrinsics::unreachable();