diff options
Diffstat (limited to 'vendor/getrandom-0.1.16/src/util_libc.rs')
-rw-r--r-- | vendor/getrandom-0.1.16/src/util_libc.rs | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/vendor/getrandom-0.1.16/src/util_libc.rs b/vendor/getrandom-0.1.16/src/util_libc.rs deleted file mode 100644 index 3cecb1dd6..000000000 --- a/vendor/getrandom-0.1.16/src/util_libc.rs +++ /dev/null @@ -1,122 +0,0 @@ -// Copyright 2019 Developers of the Rand project. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. -#![allow(dead_code)] -use crate::error::ERRNO_NOT_POSITIVE; -use crate::util::LazyUsize; -use crate::Error; -use core::num::NonZeroU32; -use core::ptr::NonNull; - -cfg_if! { - if #[cfg(any(target_os = "netbsd", target_os = "openbsd", target_os = "android"))] { - use libc::__errno as errno_location; - } else if #[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "redox"))] { - use libc::__errno_location as errno_location; - } else if #[cfg(any(target_os = "solaris", target_os = "illumos"))] { - use libc::___errno as errno_location; - } else if #[cfg(any(target_os = "macos", target_os = "freebsd"))] { - use libc::__error as errno_location; - } else if #[cfg(target_os = "haiku")] { - use libc::_errnop as errno_location; - } -} - -cfg_if! { - if #[cfg(target_os = "vxworks")] { - use libc::errnoGet as get_errno; - } else if #[cfg(target_os = "dragonfly")] { - // Until rust-lang/rust#29594 is stable, we cannot get the errno value - // on DragonFlyBSD. So we just return an out-of-range errno. - unsafe fn get_errno() -> libc::c_int { -1 } - } else { - unsafe fn get_errno() -> libc::c_int { *errno_location() } - } -} - -pub fn last_os_error() -> Error { - let errno = unsafe { get_errno() }; - if errno > 0 { - Error::from(NonZeroU32::new(errno as u32).unwrap()) - } else { - ERRNO_NOT_POSITIVE - } -} - -// Fill a buffer by repeatedly invoking a system call. The `sys_fill` function: -// - should return -1 and set errno on failure -// - should return the number of bytes written on success -pub fn sys_fill_exact( - mut buf: &mut [u8], - sys_fill: impl Fn(&mut [u8]) -> libc::ssize_t, -) -> Result<(), Error> { - while !buf.is_empty() { - let res = sys_fill(buf); - if res < 0 { - let err = last_os_error(); - // We should try again if the call was interrupted. - if err.raw_os_error() != Some(libc::EINTR) { - return Err(err); - } - } else { - // We don't check for EOF (ret = 0) as the data we are reading - // should be an infinite stream of random bytes. - buf = &mut buf[(res as usize)..]; - } - } - Ok(()) -} - -// A "weak" binding to a C function that may or may not be present at runtime. -// Used for supporting newer OS features while still building on older systems. -// F must be a function pointer of type `unsafe extern "C" fn`. Based off of the -// weak! macro in libstd. -pub struct Weak { - name: &'static str, - addr: LazyUsize, -} - -impl Weak { - // Construct a binding to a C function with a given name. This function is - // unsafe because `name` _must_ be null terminated. - pub const unsafe fn new(name: &'static str) -> Self { - Self { - name, - addr: LazyUsize::new(), - } - } - - // Return a function pointer if present at runtime. Otherwise, return null. - pub fn ptr(&self) -> Option<NonNull<libc::c_void>> { - let addr = self.addr.unsync_init(|| unsafe { - libc::dlsym(libc::RTLD_DEFAULT, self.name.as_ptr() as *const _) as usize - }); - NonNull::new(addr as *mut _) - } -} - -cfg_if! { - if #[cfg(any(target_os = "linux", target_os = "emscripten"))] { - use libc::open64 as open; - } else { - use libc::open; - } -} - -// SAFETY: path must be null terminated, FD must be manually closed. -pub unsafe fn open_readonly(path: &str) -> Result<libc::c_int, Error> { - debug_assert!(path.as_bytes().last() == Some(&0)); - let fd = open(path.as_ptr() as *const _, libc::O_RDONLY | libc::O_CLOEXEC); - if fd < 0 { - return Err(last_os_error()); - } - // O_CLOEXEC works on all Unix targets except for older Linux kernels (pre - // 2.6.23), so we also use an ioctl to make sure FD_CLOEXEC is set. - #[cfg(target_os = "linux")] - libc::ioctl(fd, libc::FIOCLEX); - Ok(fd) -} |