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 pub use self::rand::hashmap_random_keys;
22 #[macro_use] pub mod compat;
25 #[cfg(feature = "backtrace")]
30 #[cfg(feature = "backtrace")]
34 pub mod fast_thread_local;
47 pub mod stack_overflow;
57 pub fn decode_error_kind(errno: i32) -> ErrorKind {
58 match errno as c::DWORD {
59 c::ERROR_ACCESS_DENIED => return ErrorKind::PermissionDenied,
60 c::ERROR_ALREADY_EXISTS => return ErrorKind::AlreadyExists,
61 c::ERROR_FILE_EXISTS => return ErrorKind::AlreadyExists,
62 c::ERROR_BROKEN_PIPE => return ErrorKind::BrokenPipe,
63 c::ERROR_FILE_NOT_FOUND => return ErrorKind::NotFound,
64 c::ERROR_PATH_NOT_FOUND => return ErrorKind::NotFound,
65 c::ERROR_NO_DATA => return ErrorKind::BrokenPipe,
66 c::ERROR_OPERATION_ABORTED => return ErrorKind::TimedOut,
71 c::WSAEACCES => ErrorKind::PermissionDenied,
72 c::WSAEADDRINUSE => ErrorKind::AddrInUse,
73 c::WSAEADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
74 c::WSAECONNABORTED => ErrorKind::ConnectionAborted,
75 c::WSAECONNREFUSED => ErrorKind::ConnectionRefused,
76 c::WSAECONNRESET => ErrorKind::ConnectionReset,
77 c::WSAEINVAL => ErrorKind::InvalidInput,
78 c::WSAENOTCONN => ErrorKind::NotConnected,
79 c::WSAEWOULDBLOCK => ErrorKind::WouldBlock,
80 c::WSAETIMEDOUT => ErrorKind::TimedOut,
82 _ => ErrorKind::Other,
86 pub fn to_u16s<S: AsRef<OsStr>>(s: S) -> io::Result<Vec<u16>> {
87 fn inner(s: &OsStr) -> io::Result<Vec<u16>> {
88 let mut maybe_result: Vec<u16> = s.encode_wide().collect();
89 if maybe_result.iter().any(|&u| u == 0) {
90 return Err(io::Error::new(io::ErrorKind::InvalidInput,
91 "strings passed to WinAPI cannot contain NULs"));
99 // Many Windows APIs follow a pattern of where we hand a buffer and then they
100 // will report back to us how large the buffer should be or how many bytes
101 // currently reside in the buffer. This function is an abstraction over these
102 // functions by making them easier to call.
104 // The first callback, `f1`, is yielded a (pointer, len) pair which can be
105 // passed to a syscall. The `ptr` is valid for `len` items (u16 in this case).
106 // The closure is expected to return what the syscall returns which will be
107 // interpreted by this function to determine if the syscall needs to be invoked
108 // again (with more buffer space).
110 // Once the syscall has completed (errors bail out early) the second closure is
111 // yielded the data which has been read from the syscall. The return value
112 // from this closure is then the return value of the function.
113 fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> io::Result<T>
114 where F1: FnMut(*mut u16, c::DWORD) -> c::DWORD,
115 F2: FnOnce(&[u16]) -> T
117 // Start off with a stack buf but then spill over to the heap if we end up
118 // needing more space.
119 let mut stack_buf = [0u16; 512];
120 let mut heap_buf = Vec::new();
122 let mut n = stack_buf.len();
124 let buf = if n <= stack_buf.len() {
127 let extra = n - heap_buf.len();
128 heap_buf.reserve(extra);
133 // This function is typically called on windows API functions which
134 // will return the correct length of the string, but these functions
135 // also return the `0` on error. In some cases, however, the
136 // returned "correct length" may actually be 0!
138 // To handle this case we call `SetLastError` to reset it to 0 and
139 // then check it again if we get the "0 error value". If the "last
140 // error" is still 0 then we interpret it as a 0 length buffer and
141 // not an actual error.
143 let k = match f1(buf.as_mut_ptr(), n as c::DWORD) {
144 0 if c::GetLastError() == 0 => 0,
145 0 => return Err(io::Error::last_os_error()),
148 if k == n && c::GetLastError() == c::ERROR_INSUFFICIENT_BUFFER {
153 return Ok(f2(&buf[..k]))
159 fn os2path(s: &[u16]) -> PathBuf {
160 PathBuf::from(OsString::from_wide(s))
163 #[allow(dead_code)] // Only used in backtrace::gnu::get_executable_filename()
164 fn wide_char_to_multi_byte(code_page: u32,
167 no_default_char: bool)
168 -> io::Result<Vec<i8>> {
170 let mut size = c::WideCharToMultiByte(code_page,
179 return Err(io::Error::last_os_error());
182 let mut buf = Vec::with_capacity(size as usize);
183 buf.set_len(size as usize);
185 let mut used_default_char = c::FALSE;
186 size = c::WideCharToMultiByte(code_page,
193 if no_default_char { &mut used_default_char }
194 else { ptr::null_mut() });
196 return Err(io::Error::last_os_error());
198 if no_default_char && used_default_char == c::TRUE {
199 return Err(io::Error::new(io::ErrorKind::InvalidData,
200 "string cannot be converted to requested code page"));
203 buf.set_len(size as usize);
209 pub fn truncate_utf16_at_nul<'a>(v: &'a [u16]) -> &'a [u16] {
210 match v.iter().position(|c| *c == 0) {
211 // don't include the 0
218 fn is_zero(&self) -> bool;
221 macro_rules! impl_is_zero {
222 ($($t:ident)*) => ($(impl IsZero for $t {
223 fn is_zero(&self) -> bool {
229 impl_is_zero! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }
231 pub fn cvt<I: IsZero>(i: I) -> io::Result<I> {
233 Err(io::Error::last_os_error())
239 pub fn dur2timeout(dur: Duration) -> c::DWORD {
240 // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
241 // timeouts in windows APIs are typically u32 milliseconds. To translate, we
242 // have two pieces to take care of:
244 // * Nanosecond precision is rounded up
245 // * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
247 dur.as_secs().checked_mul(1000).and_then(|ms| {
248 ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000)
250 ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 {1} else {0})
252 if ms > <c::DWORD>::max_value() as u64 {
257 }).unwrap_or(c::INFINITE)
260 // On Windows, use the processor-specific __fastfail mechanism. In Windows 8
261 // and later, this will terminate the process immediately without running any
262 // in-process exception handlers. In earlier versions of Windows, this
263 // sequence of instructions will be treated as an access violation,
264 // terminating the process but without necessarily bypassing all exception
267 // https://msdn.microsoft.com/en-us/library/dn774154.aspx
268 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
269 pub unsafe fn abort_internal() -> ! {
270 asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT
271 ::intrinsics::unreachable();