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)]
12 #![allow(non_camel_case_types)]
13 #![allow(non_snake_case)]
17 use ffi::{OsStr, OsString};
18 use io::{self, ErrorKind};
21 use os::windows::ffi::{OsStrExt, OsStringExt};
25 #[macro_use] pub mod compat;
40 pub mod stack_overflow;
48 pub fn decode_error_kind(errno: i32) -> ErrorKind {
49 match errno as libc::c_int {
50 libc::ERROR_ACCESS_DENIED => ErrorKind::PermissionDenied,
51 libc::ERROR_ALREADY_EXISTS => ErrorKind::AlreadyExists,
52 libc::ERROR_BROKEN_PIPE => ErrorKind::BrokenPipe,
53 libc::ERROR_FILE_NOT_FOUND => ErrorKind::NotFound,
54 libc::ERROR_NO_DATA => ErrorKind::BrokenPipe,
55 libc::ERROR_OPERATION_ABORTED => ErrorKind::TimedOut,
57 libc::WSAEACCES => ErrorKind::PermissionDenied,
58 libc::WSAEADDRINUSE => ErrorKind::AddrInUse,
59 libc::WSAEADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
60 libc::WSAECONNABORTED => ErrorKind::ConnectionAborted,
61 libc::WSAECONNREFUSED => ErrorKind::ConnectionRefused,
62 libc::WSAECONNRESET => ErrorKind::ConnectionReset,
63 libc::WSAEINVAL => ErrorKind::InvalidInput,
64 libc::WSAENOTCONN => ErrorKind::NotConnected,
65 libc::WSAEWOULDBLOCK => ErrorKind::WouldBlock,
66 libc::WSAETIMEDOUT => ErrorKind::TimedOut,
68 _ => ErrorKind::Other,
72 fn to_utf16_os(s: &OsStr) -> Vec<u16> {
73 let mut v: Vec<_> = s.encode_wide().collect();
78 // Many Windows APIs follow a pattern of where we hand a buffer and then they
79 // will report back to us how large the buffer should be or how many bytes
80 // currently reside in the buffer. This function is an abstraction over these
81 // functions by making them easier to call.
83 // The first callback, `f1`, is yielded a (pointer, len) pair which can be
84 // passed to a syscall. The `ptr` is valid for `len` items (u16 in this case).
85 // The closure is expected to return what the syscall returns which will be
86 // interpreted by this function to determine if the syscall needs to be invoked
87 // again (with more buffer space).
89 // Once the syscall has completed (errors bail out early) the second closure is
90 // yielded the data which has been read from the syscall. The return value
91 // from this closure is then the return value of the function.
92 fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> io::Result<T>
93 where F1: FnMut(*mut u16, libc::DWORD) -> libc::DWORD,
94 F2: FnOnce(&[u16]) -> T
96 // Start off with a stack buf but then spill over to the heap if we end up
97 // needing more space.
98 let mut stack_buf = [0u16; 512];
99 let mut heap_buf = Vec::new();
101 let mut n = stack_buf.len();
103 let buf = if n <= stack_buf.len() {
106 let extra = n - heap_buf.len();
107 heap_buf.reserve(extra);
112 // This function is typically called on windows API functions which
113 // will return the correct length of the string, but these functions
114 // also return the `0` on error. In some cases, however, the
115 // returned "correct length" may actually be 0!
117 // To handle this case we call `SetLastError` to reset it to 0 and
118 // then check it again if we get the "0 error value". If the "last
119 // error" is still 0 then we interpret it as a 0 length buffer and
120 // not an actual error.
122 let k = match f1(buf.as_mut_ptr(), n as libc::DWORD) {
123 0 if libc::GetLastError() == 0 => 0,
124 0 => return Err(io::Error::last_os_error()),
127 if k == n && libc::GetLastError() ==
128 libc::ERROR_INSUFFICIENT_BUFFER as libc::DWORD {
133 return Ok(f2(&buf[..k]))
139 fn os2path(s: &[u16]) -> PathBuf {
140 PathBuf::from(OsString::from_wide(s))
143 pub fn truncate_utf16_at_nul<'a>(v: &'a [u16]) -> &'a [u16] {
144 match v.iter().position(|c| *c == 0) {
145 // don't include the 0
151 fn cvt<I: PartialEq + Zero>(i: I) -> io::Result<I> {
153 Err(io::Error::last_os_error())
159 fn dur2timeout(dur: Duration) -> libc::DWORD {
160 // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
161 // timeouts in windows APIs are typically u32 milliseconds. To translate, we
162 // have two pieces to take care of:
164 // * Nanosecond precision is rounded up
165 // * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
167 dur.as_secs().checked_mul(1000).and_then(|ms| {
168 ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000)
170 ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 {1} else {0})
172 if ms > <libc::DWORD>::max_value() as u64 {
177 }).unwrap_or(libc::INFINITE)