297 lines
9.8 KiB
Rust
297 lines
9.8 KiB
Rust
#![allow(missing_docs, nonstandard_style)]
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use crate::ffi::{OsStr, OsString};
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use crate::io::ErrorKind;
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use crate::os::windows::ffi::{OsStrExt, OsStringExt};
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use crate::path::PathBuf;
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use crate::time::Duration;
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pub use self::rand::hashmap_random_keys;
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pub use libc::strlen;
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#[macro_use]
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pub mod compat;
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pub mod alloc;
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pub mod args;
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pub mod c;
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pub mod cmath;
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pub mod condvar;
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pub mod env;
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pub mod fs;
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pub mod handle;
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pub mod io;
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pub mod memchr;
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pub mod mutex;
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pub mod net;
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pub mod os;
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pub mod os_str;
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pub mod path;
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pub mod pipe;
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pub mod process;
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pub mod rand;
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pub mod rwlock;
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pub mod thread;
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pub mod thread_local_dtor;
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pub mod thread_local_key;
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pub mod thread_parker;
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pub mod time;
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cfg_if::cfg_if! {
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if #[cfg(not(target_vendor = "uwp"))] {
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pub mod stdio;
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pub mod stack_overflow;
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} else {
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pub mod stdio_uwp;
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pub mod stack_overflow_uwp;
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pub use self::stdio_uwp as stdio;
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pub use self::stack_overflow_uwp as stack_overflow;
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}
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}
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// SAFETY: must be called only once during runtime initialization.
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// NOTE: this is not guaranteed to run, for example when Rust code is called externally.
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pub unsafe fn init(_argc: isize, _argv: *const *const u8) {
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stack_overflow::init();
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}
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// SAFETY: must be called only once during runtime cleanup.
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// NOTE: this is not guaranteed to run, for example when the program aborts.
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pub unsafe fn cleanup() {
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net::cleanup();
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}
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pub fn decode_error_kind(errno: i32) -> ErrorKind {
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match errno as c::DWORD {
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c::ERROR_ACCESS_DENIED => return ErrorKind::PermissionDenied,
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c::ERROR_ALREADY_EXISTS => return ErrorKind::AlreadyExists,
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c::ERROR_FILE_EXISTS => return ErrorKind::AlreadyExists,
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c::ERROR_BROKEN_PIPE => return ErrorKind::BrokenPipe,
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c::ERROR_FILE_NOT_FOUND => return ErrorKind::NotFound,
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c::ERROR_PATH_NOT_FOUND => return ErrorKind::NotFound,
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c::ERROR_NO_DATA => return ErrorKind::BrokenPipe,
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c::ERROR_INVALID_PARAMETER => return ErrorKind::InvalidInput,
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c::ERROR_NOT_ENOUGH_MEMORY | c::ERROR_OUTOFMEMORY => return ErrorKind::OutOfMemory,
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c::ERROR_SEM_TIMEOUT
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| c::WAIT_TIMEOUT
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| c::ERROR_DRIVER_CANCEL_TIMEOUT
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| c::ERROR_OPERATION_ABORTED
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| c::ERROR_SERVICE_REQUEST_TIMEOUT
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| c::ERROR_COUNTER_TIMEOUT
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| c::ERROR_TIMEOUT
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| c::ERROR_RESOURCE_CALL_TIMED_OUT
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| c::ERROR_CTX_MODEM_RESPONSE_TIMEOUT
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| c::ERROR_CTX_CLIENT_QUERY_TIMEOUT
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| c::FRS_ERR_SYSVOL_POPULATE_TIMEOUT
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| c::ERROR_DS_TIMELIMIT_EXCEEDED
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| c::DNS_ERROR_RECORD_TIMED_OUT
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| c::ERROR_IPSEC_IKE_TIMED_OUT
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| c::ERROR_RUNLEVEL_SWITCH_TIMEOUT
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| c::ERROR_RUNLEVEL_SWITCH_AGENT_TIMEOUT => return ErrorKind::TimedOut,
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c::ERROR_CALL_NOT_IMPLEMENTED => return ErrorKind::Unsupported,
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_ => {}
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}
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match errno {
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c::WSAEACCES => ErrorKind::PermissionDenied,
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c::WSAEADDRINUSE => ErrorKind::AddrInUse,
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c::WSAEADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
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c::WSAECONNABORTED => ErrorKind::ConnectionAborted,
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c::WSAECONNREFUSED => ErrorKind::ConnectionRefused,
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c::WSAECONNRESET => ErrorKind::ConnectionReset,
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c::WSAEINVAL => ErrorKind::InvalidInput,
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c::WSAENOTCONN => ErrorKind::NotConnected,
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c::WSAEWOULDBLOCK => ErrorKind::WouldBlock,
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c::WSAETIMEDOUT => ErrorKind::TimedOut,
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_ => ErrorKind::Other,
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}
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}
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pub fn unrolled_find_u16s(needle: u16, haystack: &[u16]) -> Option<usize> {
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let ptr = haystack.as_ptr();
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let mut start = &haystack[..];
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// For performance reasons unfold the loop eight times.
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while start.len() >= 8 {
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macro_rules! if_return {
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($($n:literal,)+) => {
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$(
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if start[$n] == needle {
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return Some((&start[$n] as *const u16 as usize - ptr as usize) / 2);
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}
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)+
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}
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}
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if_return!(0, 1, 2, 3, 4, 5, 6, 7,);
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start = &start[8..];
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}
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for c in start {
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if *c == needle {
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return Some((c as *const u16 as usize - ptr as usize) / 2);
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}
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}
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None
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}
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pub fn to_u16s<S: AsRef<OsStr>>(s: S) -> crate::io::Result<Vec<u16>> {
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fn inner(s: &OsStr) -> crate::io::Result<Vec<u16>> {
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let mut maybe_result: Vec<u16> = s.encode_wide().collect();
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if unrolled_find_u16s(0, &maybe_result).is_some() {
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return Err(crate::io::Error::new_const(
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ErrorKind::InvalidInput,
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&"strings passed to WinAPI cannot contain NULs",
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));
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}
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maybe_result.push(0);
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Ok(maybe_result)
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}
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inner(s.as_ref())
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}
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// Many Windows APIs follow a pattern of where we hand a buffer and then they
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// will report back to us how large the buffer should be or how many bytes
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// currently reside in the buffer. This function is an abstraction over these
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// functions by making them easier to call.
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//
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// The first callback, `f1`, is yielded a (pointer, len) pair which can be
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// passed to a syscall. The `ptr` is valid for `len` items (u16 in this case).
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// The closure is expected to return what the syscall returns which will be
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// interpreted by this function to determine if the syscall needs to be invoked
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// again (with more buffer space).
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//
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// Once the syscall has completed (errors bail out early) the second closure is
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// yielded the data which has been read from the syscall. The return value
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// from this closure is then the return value of the function.
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fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> crate::io::Result<T>
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where
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F1: FnMut(*mut u16, c::DWORD) -> c::DWORD,
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F2: FnOnce(&[u16]) -> T,
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{
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// Start off with a stack buf but then spill over to the heap if we end up
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// needing more space.
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let mut stack_buf = [0u16; 512];
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let mut heap_buf = Vec::new();
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unsafe {
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let mut n = stack_buf.len();
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loop {
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let buf = if n <= stack_buf.len() {
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&mut stack_buf[..]
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} else {
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let extra = n - heap_buf.len();
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heap_buf.reserve(extra);
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heap_buf.set_len(n);
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&mut heap_buf[..]
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};
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// This function is typically called on windows API functions which
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// will return the correct length of the string, but these functions
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// also return the `0` on error. In some cases, however, the
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// returned "correct length" may actually be 0!
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//
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// To handle this case we call `SetLastError` to reset it to 0 and
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// then check it again if we get the "0 error value". If the "last
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// error" is still 0 then we interpret it as a 0 length buffer and
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// not an actual error.
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c::SetLastError(0);
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let k = match f1(buf.as_mut_ptr(), n as c::DWORD) {
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0 if c::GetLastError() == 0 => 0,
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0 => return Err(crate::io::Error::last_os_error()),
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n => n,
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} as usize;
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if k == n && c::GetLastError() == c::ERROR_INSUFFICIENT_BUFFER {
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n *= 2;
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} else if k >= n {
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n = k;
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} else {
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return Ok(f2(&buf[..k]));
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}
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}
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}
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}
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fn os2path(s: &[u16]) -> PathBuf {
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PathBuf::from(OsString::from_wide(s))
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}
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pub fn truncate_utf16_at_nul(v: &[u16]) -> &[u16] {
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match unrolled_find_u16s(0, v) {
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// don't include the 0
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Some(i) => &v[..i],
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None => v,
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}
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}
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pub trait IsZero {
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fn is_zero(&self) -> bool;
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}
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macro_rules! impl_is_zero {
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($($t:ident)*) => ($(impl IsZero for $t {
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fn is_zero(&self) -> bool {
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*self == 0
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}
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})*)
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}
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impl_is_zero! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }
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pub fn cvt<I: IsZero>(i: I) -> crate::io::Result<I> {
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if i.is_zero() { Err(crate::io::Error::last_os_error()) } else { Ok(i) }
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}
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pub fn dur2timeout(dur: Duration) -> c::DWORD {
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// Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
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// timeouts in windows APIs are typically u32 milliseconds. To translate, we
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// have two pieces to take care of:
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//
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// * Nanosecond precision is rounded up
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// * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
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// (never time out).
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dur.as_secs()
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.checked_mul(1000)
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.and_then(|ms| ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000))
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.and_then(|ms| ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 { 1 } else { 0 }))
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.map(|ms| if ms > <c::DWORD>::MAX as u64 { c::INFINITE } else { ms as c::DWORD })
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.unwrap_or(c::INFINITE)
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}
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/// Use `__fastfail` to abort the process
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///
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/// This is the same implementation as in libpanic_abort's `__rust_start_panic`. See
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/// that function for more information on `__fastfail`
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#[allow(unreachable_code)]
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pub fn abort_internal() -> ! {
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const FAST_FAIL_FATAL_APP_EXIT: usize = 7;
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unsafe {
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cfg_if::cfg_if! {
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if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
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asm!("int $$0x29", in("ecx") FAST_FAIL_FATAL_APP_EXIT);
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crate::intrinsics::unreachable();
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} else if #[cfg(all(target_arch = "arm", target_feature = "thumb-mode"))] {
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asm!(".inst 0xDEFB", in("r0") FAST_FAIL_FATAL_APP_EXIT);
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crate::intrinsics::unreachable();
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} else if #[cfg(target_arch = "aarch64")] {
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asm!("brk 0xF003", in("x0") FAST_FAIL_FATAL_APP_EXIT);
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crate::intrinsics::unreachable();
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}
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}
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}
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crate::intrinsics::abort();
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}
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cfg_if::cfg_if! {
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if #[cfg(target_vendor = "uwp")] {
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#[link(name = "ws2_32")]
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// For BCryptGenRandom
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#[link(name = "bcrypt")]
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extern "C" {}
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} else {
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#[link(name = "advapi32")]
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#[link(name = "ws2_32")]
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#[link(name = "userenv")]
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extern "C" {}
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}
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}
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