1 #![allow(missing_docs, nonstandard_style)]
3 use crate::ffi
::{OsStr, OsString}
;
4 use crate::io
::ErrorKind
;
5 use crate::os
::windows
::ffi
::{OsStrExt, OsStringExt}
;
6 use crate::path
::PathBuf
;
7 use crate::time
::Duration
;
9 pub use self::rand
::hashmap_random_keys
;
36 pub mod thread_local_dtor
;
37 pub mod thread_local_key
;
38 pub mod thread_parker
;
41 if #[cfg(not(target_vendor = "uwp"))] {
43 pub mod stack_overflow
;
46 pub mod stack_overflow_uwp
;
47 pub use self::stdio_uwp
as stdio
;
48 pub use self::stack_overflow_uwp
as stack_overflow
;
52 // SAFETY: must be called only once during runtime initialization.
53 // NOTE: this is not guaranteed to run, for example when Rust code is called externally.
54 pub unsafe fn init(_argc
: isize, _argv
: *const *const u8) {
55 stack_overflow
::init();
58 // SAFETY: must be called only once during runtime cleanup.
59 // NOTE: this is not guaranteed to run, for example when the program aborts.
60 pub unsafe fn cleanup() {
64 pub fn decode_error_kind(errno
: i32) -> ErrorKind
{
65 match errno
as c
::DWORD
{
66 c
::ERROR_ACCESS_DENIED
=> return ErrorKind
::PermissionDenied
,
67 c
::ERROR_ALREADY_EXISTS
=> return ErrorKind
::AlreadyExists
,
68 c
::ERROR_FILE_EXISTS
=> return ErrorKind
::AlreadyExists
,
69 c
::ERROR_BROKEN_PIPE
=> return ErrorKind
::BrokenPipe
,
70 c
::ERROR_FILE_NOT_FOUND
=> return ErrorKind
::NotFound
,
71 c
::ERROR_PATH_NOT_FOUND
=> return ErrorKind
::NotFound
,
72 c
::ERROR_NO_DATA
=> return ErrorKind
::BrokenPipe
,
73 c
::ERROR_INVALID_PARAMETER
=> return ErrorKind
::InvalidInput
,
76 | c
::ERROR_DRIVER_CANCEL_TIMEOUT
77 | c
::ERROR_OPERATION_ABORTED
78 | c
::ERROR_SERVICE_REQUEST_TIMEOUT
79 | c
::ERROR_COUNTER_TIMEOUT
81 | c
::ERROR_RESOURCE_CALL_TIMED_OUT
82 | c
::ERROR_CTX_MODEM_RESPONSE_TIMEOUT
83 | c
::ERROR_CTX_CLIENT_QUERY_TIMEOUT
84 | c
::FRS_ERR_SYSVOL_POPULATE_TIMEOUT
85 | c
::ERROR_DS_TIMELIMIT_EXCEEDED
86 | c
::DNS_ERROR_RECORD_TIMED_OUT
87 | c
::ERROR_IPSEC_IKE_TIMED_OUT
88 | c
::ERROR_RUNLEVEL_SWITCH_TIMEOUT
89 | c
::ERROR_RUNLEVEL_SWITCH_AGENT_TIMEOUT
=> return ErrorKind
::TimedOut
,
90 c
::ERROR_CALL_NOT_IMPLEMENTED
=> return ErrorKind
::Unsupported
,
95 c
::WSAEACCES
=> ErrorKind
::PermissionDenied
,
96 c
::WSAEADDRINUSE
=> ErrorKind
::AddrInUse
,
97 c
::WSAEADDRNOTAVAIL
=> ErrorKind
::AddrNotAvailable
,
98 c
::WSAECONNABORTED
=> ErrorKind
::ConnectionAborted
,
99 c
::WSAECONNREFUSED
=> ErrorKind
::ConnectionRefused
,
100 c
::WSAECONNRESET
=> ErrorKind
::ConnectionReset
,
101 c
::WSAEINVAL
=> ErrorKind
::InvalidInput
,
102 c
::WSAENOTCONN
=> ErrorKind
::NotConnected
,
103 c
::WSAEWOULDBLOCK
=> ErrorKind
::WouldBlock
,
104 c
::WSAETIMEDOUT
=> ErrorKind
::TimedOut
,
106 _
=> ErrorKind
::Other
,
110 pub fn unrolled_find_u16s(needle
: u16, haystack
: &[u16]) -> Option
<usize> {
111 let ptr
= haystack
.as_ptr();
112 let mut start
= &haystack
[..];
114 // For performance reasons unfold the loop eight times.
115 while start
.len() >= 8 {
116 macro_rules
! if_return
{
117 ($
($n
:literal
,)+) => {
119 if start
[$n
] == needle
{
120 return Some((&start
[$n
] as *const u16 as usize - ptr
as usize) / 2);
126 if_return
!(0, 1, 2, 3, 4, 5, 6, 7,);
133 return Some((c
as *const u16 as usize - ptr
as usize) / 2);
139 pub fn to_u16s
<S
: AsRef
<OsStr
>>(s
: S
) -> crate::io
::Result
<Vec
<u16>> {
140 fn inner(s
: &OsStr
) -> crate::io
::Result
<Vec
<u16>> {
141 let mut maybe_result
: Vec
<u16> = s
.encode_wide().collect();
142 if unrolled_find_u16s(0, &maybe_result
).is_some() {
143 return Err(crate::io
::Error
::new_const(
144 ErrorKind
::InvalidInput
,
145 &"strings passed to WinAPI cannot contain NULs",
148 maybe_result
.push(0);
154 // Many Windows APIs follow a pattern of where we hand a buffer and then they
155 // will report back to us how large the buffer should be or how many bytes
156 // currently reside in the buffer. This function is an abstraction over these
157 // functions by making them easier to call.
159 // The first callback, `f1`, is yielded a (pointer, len) pair which can be
160 // passed to a syscall. The `ptr` is valid for `len` items (u16 in this case).
161 // The closure is expected to return what the syscall returns which will be
162 // interpreted by this function to determine if the syscall needs to be invoked
163 // again (with more buffer space).
165 // Once the syscall has completed (errors bail out early) the second closure is
166 // yielded the data which has been read from the syscall. The return value
167 // from this closure is then the return value of the function.
168 fn fill_utf16_buf
<F1
, F2
, T
>(mut f1
: F1
, f2
: F2
) -> crate::io
::Result
<T
>
170 F1
: FnMut(*mut u16, c
::DWORD
) -> c
::DWORD
,
171 F2
: FnOnce(&[u16]) -> T
,
173 // Start off with a stack buf but then spill over to the heap if we end up
174 // needing more space.
175 let mut stack_buf
= [0u16; 512];
176 let mut heap_buf
= Vec
::new();
178 let mut n
= stack_buf
.len();
180 let buf
= if n
<= stack_buf
.len() {
183 let extra
= n
- heap_buf
.len();
184 heap_buf
.reserve(extra
);
189 // This function is typically called on windows API functions which
190 // will return the correct length of the string, but these functions
191 // also return the `0` on error. In some cases, however, the
192 // returned "correct length" may actually be 0!
194 // To handle this case we call `SetLastError` to reset it to 0 and
195 // then check it again if we get the "0 error value". If the "last
196 // error" is still 0 then we interpret it as a 0 length buffer and
197 // not an actual error.
199 let k
= match f1(buf
.as_mut_ptr(), n
as c
::DWORD
) {
200 0 if c
::GetLastError() == 0 => 0,
201 0 => return Err(crate::io
::Error
::last_os_error()),
204 if k
== n
&& c
::GetLastError() == c
::ERROR_INSUFFICIENT_BUFFER
{
209 return Ok(f2(&buf
[..k
]));
215 fn os2path(s
: &[u16]) -> PathBuf
{
216 PathBuf
::from(OsString
::from_wide(s
))
219 pub fn truncate_utf16_at_nul(v
: &[u16]) -> &[u16] {
220 match unrolled_find_u16s(0, v
) {
221 // don't include the 0
228 fn is_zero(&self) -> bool
;
231 macro_rules
! impl_is_zero
{
232 ($
($t
:ident
)*) => ($
(impl IsZero
for $t
{
233 fn is_zero(&self) -> bool
{
239 impl_is_zero
! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }
241 pub fn cvt
<I
: IsZero
>(i
: I
) -> crate::io
::Result
<I
> {
242 if i
.is_zero() { Err(crate::io::Error::last_os_error()) }
else { Ok(i) }
245 pub fn dur2timeout(dur
: Duration
) -> c
::DWORD
{
246 // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
247 // timeouts in windows APIs are typically u32 milliseconds. To translate, we
248 // have two pieces to take care of:
250 // * Nanosecond precision is rounded up
251 // * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
255 .and_then(|ms
| ms
.checked_add((dur
.subsec_nanos() as u64) / 1_000_000))
256 .and_then(|ms
| ms
.checked_add(if dur
.subsec_nanos() % 1_000_000 > 0 { 1 }
else { 0 }
))
257 .map(|ms
| if ms
> <c
::DWORD
>::MAX
as u64 { c::INFINITE }
else { ms as c::DWORD }
)
258 .unwrap_or(c
::INFINITE
)
261 /// Use `__fastfail` to abort the process
263 /// This is the same implementation as in libpanic_abort's `__rust_start_panic`. See
264 /// that function for more information on `__fastfail`
265 #[allow(unreachable_code)]
266 pub fn abort_internal() -> ! {
267 const FAST_FAIL_FATAL_APP_EXIT
: usize = 7;
270 if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
271 asm
!("int $$0x29", in("ecx") FAST_FAIL_FATAL_APP_EXIT
);
272 crate::intrinsics
::unreachable();
273 } else if #[cfg(all(target_arch = "arm", target_feature = "thumb-mode"))] {
274 asm
!(".inst 0xDEFB", in("r0") FAST_FAIL_FATAL_APP_EXIT
);
275 crate::intrinsics
::unreachable();
276 } else if #[cfg(target_arch = "aarch64")] {
277 asm
!("brk 0xF003", in("x0") FAST_FAIL_FATAL_APP_EXIT
);
278 crate::intrinsics
::unreachable();
282 crate::intrinsics
::abort();
286 if #[cfg(target_vendor = "uwp")] {
287 #[link(name = "ws2_32")]
288 // For BCryptGenRandom
289 #[link(name = "bcrypt")]
292 #[link(name = "advapi32")]
293 #[link(name = "ws2_32")]
294 #[link(name = "userenv")]