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Diffstat (limited to 'library/std/src/sys/windows/mod.rs')
| -rw-r--r-- | library/std/src/sys/windows/mod.rs | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/library/std/src/sys/windows/mod.rs b/library/std/src/sys/windows/mod.rs new file mode 100644 index 00000000000..9a52371280e --- /dev/null +++ b/library/std/src/sys/windows/mod.rs @@ -0,0 +1,334 @@ +#![allow(missing_docs, nonstandard_style)] + +use crate::ffi::{OsStr, OsString}; +use crate::io::ErrorKind; +use crate::os::windows::ffi::{OsStrExt, OsStringExt}; +use crate::path::PathBuf; +use crate::ptr; +use crate::time::Duration; + +pub use self::rand::hashmap_random_keys; +pub use libc::strlen; + +#[macro_use] +pub mod compat; + +pub mod alloc; +pub mod args; +pub mod c; +pub mod cmath; +pub mod condvar; +pub mod env; +pub mod ext; +pub mod fs; +pub mod handle; +pub mod io; +pub mod memchr; +pub mod mutex; +pub mod net; +pub mod os; +pub mod os_str; +pub mod path; +pub mod pipe; +pub mod process; +pub mod rand; +pub mod rwlock; +pub mod thread; +pub mod thread_local_dtor; +pub mod thread_local_key; +pub mod time; +cfg_if::cfg_if! { + if #[cfg(not(target_vendor = "uwp"))] { + pub mod stdio; + pub mod stack_overflow; + } else { + pub mod stdio_uwp; + pub mod stack_overflow_uwp; + pub use self::stdio_uwp as stdio; + pub use self::stack_overflow_uwp as stack_overflow; + } +} + +#[cfg(not(test))] +pub fn init() {} + +pub fn decode_error_kind(errno: i32) -> ErrorKind { + match errno as c::DWORD { + c::ERROR_ACCESS_DENIED => return ErrorKind::PermissionDenied, + c::ERROR_ALREADY_EXISTS => return ErrorKind::AlreadyExists, + c::ERROR_FILE_EXISTS => return ErrorKind::AlreadyExists, + c::ERROR_BROKEN_PIPE => return ErrorKind::BrokenPipe, + c::ERROR_FILE_NOT_FOUND => return ErrorKind::NotFound, + c::ERROR_PATH_NOT_FOUND => return ErrorKind::NotFound, + c::ERROR_NO_DATA => return ErrorKind::BrokenPipe, + c::ERROR_INVALID_PARAMETER => return ErrorKind::InvalidInput, + c::ERROR_SEM_TIMEOUT + | c::WAIT_TIMEOUT + | c::ERROR_DRIVER_CANCEL_TIMEOUT + | c::ERROR_OPERATION_ABORTED + | c::ERROR_SERVICE_REQUEST_TIMEOUT + | c::ERROR_COUNTER_TIMEOUT + | c::ERROR_TIMEOUT + | c::ERROR_RESOURCE_CALL_TIMED_OUT + | c::ERROR_CTX_MODEM_RESPONSE_TIMEOUT + | c::ERROR_CTX_CLIENT_QUERY_TIMEOUT + | c::FRS_ERR_SYSVOL_POPULATE_TIMEOUT + | c::ERROR_DS_TIMELIMIT_EXCEEDED + | c::DNS_ERROR_RECORD_TIMED_OUT + | c::ERROR_IPSEC_IKE_TIMED_OUT + | c::ERROR_RUNLEVEL_SWITCH_TIMEOUT + | c::ERROR_RUNLEVEL_SWITCH_AGENT_TIMEOUT => return ErrorKind::TimedOut, + _ => {} + } + + match errno { + c::WSAEACCES => ErrorKind::PermissionDenied, + c::WSAEADDRINUSE => ErrorKind::AddrInUse, + c::WSAEADDRNOTAVAIL => ErrorKind::AddrNotAvailable, + c::WSAECONNABORTED => ErrorKind::ConnectionAborted, + c::WSAECONNREFUSED => ErrorKind::ConnectionRefused, + c::WSAECONNRESET => ErrorKind::ConnectionReset, + c::WSAEINVAL => ErrorKind::InvalidInput, + c::WSAENOTCONN => ErrorKind::NotConnected, + c::WSAEWOULDBLOCK => ErrorKind::WouldBlock, + c::WSAETIMEDOUT => ErrorKind::TimedOut, + + _ => ErrorKind::Other, + } +} + +pub fn unrolled_find_u16s(needle: u16, haystack: &[u16]) -> Option<usize> { + let ptr = haystack.as_ptr(); + let mut len = haystack.len(); + let mut start = &haystack[..]; + + // For performance reasons unfold the loop eight times. + while len >= 8 { + if start[0] == needle { + return Some((start.as_ptr() as usize - ptr as usize) / 2); + } + if start[1] == needle { + return Some((start[1..].as_ptr() as usize - ptr as usize) / 2); + } + if start[2] == needle { + return Some((start[2..].as_ptr() as usize - ptr as usize) / 2); + } + if start[3] == needle { + return Some((start[3..].as_ptr() as usize - ptr as usize) / 2); + } + if start[4] == needle { + return Some((start[4..].as_ptr() as usize - ptr as usize) / 2); + } + if start[5] == needle { + return Some((start[5..].as_ptr() as usize - ptr as usize) / 2); + } + if start[6] == needle { + return Some((start[6..].as_ptr() as usize - ptr as usize) / 2); + } + if start[7] == needle { + return Some((start[7..].as_ptr() as usize - ptr as usize) / 2); + } + + start = &start[8..]; + len -= 8; + } + + for (i, c) in start.iter().enumerate() { + if *c == needle { + return Some((start.as_ptr() as usize - ptr as usize) / 2 + i); + } + } + None +} + +pub fn to_u16s<S: AsRef<OsStr>>(s: S) -> crate::io::Result<Vec<u16>> { + fn inner(s: &OsStr) -> crate::io::Result<Vec<u16>> { + let mut maybe_result: Vec<u16> = s.encode_wide().collect(); + if unrolled_find_u16s(0, &maybe_result).is_some() { + return Err(crate::io::Error::new( + ErrorKind::InvalidInput, + "strings passed to WinAPI cannot contain NULs", + )); + } + maybe_result.push(0); + Ok(maybe_result) + } + inner(s.as_ref()) +} + +// Many Windows APIs follow a pattern of where we hand a buffer and then they +// will report back to us how large the buffer should be or how many bytes +// currently reside in the buffer. This function is an abstraction over these +// functions by making them easier to call. +// +// The first callback, `f1`, is yielded a (pointer, len) pair which can be +// passed to a syscall. The `ptr` is valid for `len` items (u16 in this case). +// The closure is expected to return what the syscall returns which will be +// interpreted by this function to determine if the syscall needs to be invoked +// again (with more buffer space). +// +// Once the syscall has completed (errors bail out early) the second closure is +// yielded the data which has been read from the syscall. The return value +// from this closure is then the return value of the function. +fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> crate::io::Result<T> +where + F1: FnMut(*mut u16, c::DWORD) -> c::DWORD, + F2: FnOnce(&[u16]) -> T, +{ + // Start off with a stack buf but then spill over to the heap if we end up + // needing more space. + let mut stack_buf = [0u16; 512]; + let mut heap_buf = Vec::new(); + unsafe { + let mut n = stack_buf.len(); + loop { + let buf = if n <= stack_buf.len() { + &mut stack_buf[..] + } else { + let extra = n - heap_buf.len(); + heap_buf.reserve(extra); + heap_buf.set_len(n); + &mut heap_buf[..] + }; + + // This function is typically called on windows API functions which + // will return the correct length of the string, but these functions + // also return the `0` on error. In some cases, however, the + // returned "correct length" may actually be 0! + // + // To handle this case we call `SetLastError` to reset it to 0 and + // then check it again if we get the "0 error value". If the "last + // error" is still 0 then we interpret it as a 0 length buffer and + // not an actual error. + c::SetLastError(0); + let k = match f1(buf.as_mut_ptr(), n as c::DWORD) { + 0 if c::GetLastError() == 0 => 0, + 0 => return Err(crate::io::Error::last_os_error()), + n => n, + } as usize; + if k == n && c::GetLastError() == c::ERROR_INSUFFICIENT_BUFFER { + n *= 2; + } else if k >= n { + n = k; + } else { + return Ok(f2(&buf[..k])); + } + } + } +} + +fn os2path(s: &[u16]) -> PathBuf { + PathBuf::from(OsString::from_wide(s)) +} + +#[allow(dead_code)] // Only used in backtrace::gnu::get_executable_filename() +fn wide_char_to_multi_byte( + code_page: u32, + flags: u32, + s: &[u16], + no_default_char: bool, +) -> crate::io::Result<Vec<i8>> { + unsafe { + let mut size = c::WideCharToMultiByte( + code_page, + flags, + s.as_ptr(), + s.len() as i32, + ptr::null_mut(), + 0, + ptr::null(), + ptr::null_mut(), + ); + if size == 0 { + return Err(crate::io::Error::last_os_error()); + } + + let mut buf = Vec::with_capacity(size as usize); + buf.set_len(size as usize); + + let mut used_default_char = c::FALSE; + size = c::WideCharToMultiByte( + code_page, + flags, + s.as_ptr(), + s.len() as i32, + buf.as_mut_ptr(), + buf.len() as i32, + ptr::null(), + if no_default_char { &mut used_default_char } else { ptr::null_mut() }, + ); + if size == 0 { + return Err(crate::io::Error::last_os_error()); + } + if no_default_char && used_default_char == c::TRUE { + return Err(crate::io::Error::new( + crate::io::ErrorKind::InvalidData, + "string cannot be converted to requested code page", + )); + } + + buf.set_len(size as usize); + + Ok(buf) + } +} + +pub fn truncate_utf16_at_nul(v: &[u16]) -> &[u16] { + match unrolled_find_u16s(0, v) { + // don't include the 0 + Some(i) => &v[..i], + None => v, + } +} + +pub trait IsZero { + fn is_zero(&self) -> bool; +} + +macro_rules! impl_is_zero { + ($($t:ident)*) => ($(impl IsZero for $t { + fn is_zero(&self) -> bool { + *self == 0 + } + })*) +} + +impl_is_zero! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize } + +pub fn cvt<I: IsZero>(i: I) -> crate::io::Result<I> { + if i.is_zero() { Err(crate::io::Error::last_os_error()) } else { Ok(i) } +} + +pub fn dur2timeout(dur: Duration) -> c::DWORD { + // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the + // timeouts in windows APIs are typically u32 milliseconds. To translate, we + // have two pieces to take care of: + // + // * Nanosecond precision is rounded up + // * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE + // (never time out). + dur.as_secs() + .checked_mul(1000) + .and_then(|ms| ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000)) + .and_then(|ms| ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 { 1 } else { 0 })) + .map(|ms| if ms > <c::DWORD>::MAX as u64 { c::INFINITE } else { ms as c::DWORD }) + .unwrap_or(c::INFINITE) +} + +// On Windows, use the processor-specific __fastfail mechanism. In Windows 8 +// and later, this will terminate the process immediately without running any +// in-process exception handlers. In earlier versions of Windows, this +// sequence of instructions will be treated as an access violation, +// terminating the process but without necessarily bypassing all exception +// handlers. +// +// https://docs.microsoft.com/en-us/cpp/intrinsics/fastfail +#[allow(unreachable_code)] +pub fn abort_internal() -> ! { + #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] + unsafe { + llvm_asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT + crate::intrinsics::unreachable(); + } + crate::intrinsics::abort(); +} |