1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254
//! Functions returning the stdio file descriptors.
//!
//! # Safety
//!
//! These access the file descriptors by absolute index value, and nothing
//! prevents them from being closed and reused. They should only be used in
//! `main` or other situations where one is in control of the process'
//! stdio streams.
#![allow(unsafe_code)]
use crate::backend;
use crate::fd::OwnedFd;
use backend::fd::{BorrowedFd, FromRawFd, RawFd};
/// `STDIN_FILENO`—Standard input, borrowed.
///
/// # Safety
///
/// This function must be called from code which knows how the process'
/// standard input is being used. Often, this will be the `main` function or
/// code that knows its relationship with the `main` function.
///
/// The stdin file descriptor can be closed, potentially on other threads, in
/// which case the file descriptor index value could be dynamically reused for
/// other purposes, potentially on different threads.
///
/// # Other hazards
///
/// Stdin could be redirected from arbitrary input sources, and unless one
/// knows how the process' standard input is being used, one could consume
/// bytes that are expected to be consumed by other parts of the process.
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html
/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html
#[doc(alias = "STDIN_FILENO")]
#[inline]
pub const unsafe fn stdin() -> BorrowedFd<'static> {
BorrowedFd::borrow_raw(backend::io::types::STDIN_FILENO as RawFd)
}
/// `STDIN_FILENO`—Standard input, owned.
///
/// This is similar to [`stdin`], however it returns an `OwnedFd` which closes
/// standard input when it is dropped.
///
/// # Safety
///
/// This is unsafe for the same reasons as [`stdin`].
///
/// # Other hazards
///
/// This has the same hazards as [`stdin`].
///
/// And, when the `OwnedFd` is dropped, subsequent newly created file
/// descriptors may unknowingly reuse the stdin file descriptor number, which
/// may break common assumptions, so it should typically only be dropped at the
/// end of a program when no more file descriptors will be created.
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html
/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html
#[doc(alias = "STDIN_FILENO")]
#[inline]
pub unsafe fn take_stdin() -> OwnedFd {
backend::fd::OwnedFd::from_raw_fd(backend::io::types::STDIN_FILENO as RawFd)
}
/// `STDOUT_FILENO`—Standard output, borrowed.
///
/// # Safety
///
/// This function must be called from code which knows how the process'
/// standard output is being used. Often, this will be the `main` function or
/// code that knows its relationship with the `main` function.
///
/// The stdout file descriptor can be closed, potentially on other threads, in
/// which case the file descriptor index value could be dynamically reused for
/// other purposes, potentially on different threads.
///
/// # Other hazards
///
/// Stdout could be redirected to arbitrary output sinks, and unless one
/// knows how the process' standard output is being used, one could
/// unexpectedly inject bytes into a stream being written by another part of
/// the process.
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html
/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html
#[doc(alias = "STDOUT_FILENO")]
#[inline]
pub const unsafe fn stdout() -> BorrowedFd<'static> {
BorrowedFd::borrow_raw(backend::io::types::STDOUT_FILENO as RawFd)
}
/// `STDOUT_FILENO`—Standard output, owned.
///
/// This is similar to [`stdout`], however it returns an `OwnedFd` which closes
/// standard output when it is dropped.
///
/// # Safety
///
/// This is unsafe for the same reasons as [`stdout`].
///
/// # Other hazards
///
/// This has the same hazards as [`stdout`].
///
/// And, when the `OwnedFd` is dropped, subsequent newly created file
/// descriptors may unknowingly reuse the stdout file descriptor number, which
/// may break common assumptions, so it should typically only be dropped at the
/// end of a program when no more file descriptors will be created.
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html
/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html
#[doc(alias = "STDOUT_FILENO")]
#[inline]
pub unsafe fn take_stdout() -> OwnedFd {
backend::fd::OwnedFd::from_raw_fd(backend::io::types::STDOUT_FILENO as RawFd)
}
/// `STDERR_FILENO`—Standard error, borrowed.
///
/// # Safety
///
/// This function must be called from code which knows how the process'
/// standard error is being used. Often, this will be the `main` function or
/// code that knows its relationship with the `main` function.
///
/// The stderr file descriptor can be closed, potentially on other threads, in
/// which case the file descriptor index value could be dynamically reused for
/// other purposes, potentially on different threads.
///
/// # Other hazards
///
/// Stderr could be redirected to arbitrary output sinks, and unless one
/// knows how the process' standard error is being used, one could unexpectedly
/// inject bytes into a stream being written by another part of the process.
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html
/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html
#[doc(alias = "STDERR_FILENO")]
#[inline]
pub const unsafe fn stderr() -> BorrowedFd<'static> {
BorrowedFd::borrow_raw(backend::io::types::STDERR_FILENO as RawFd)
}
/// `STDERR_FILENO`—Standard error, owned.
///
/// This is similar to [`stdout`], however it returns an `OwnedFd` which closes
/// standard output when it is dropped.
///
/// # Safety
///
/// This is unsafe for the same reasons as [`stderr`].
///
/// # Other hazards
///
/// This has the same hazards as [`stderr`].
///
/// And, when the `OwnedFd` is dropped, subsequent newly created file
/// descriptors may unknowingly reuse the stderr file descriptor number, which
/// may break common assumptions, so it should typically only be dropped at the
/// end of a program when no more file descriptors will be created.
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html
/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html
#[doc(alias = "STDERR_FILENO")]
#[inline]
pub unsafe fn take_stderr() -> OwnedFd {
backend::fd::OwnedFd::from_raw_fd(backend::io::types::STDERR_FILENO as RawFd)
}
/// `STDIN_FILENO`—Standard input, raw.
///
/// This is similar to [`stdin`], however it returns a `RawFd`.
///
/// # Other hazards
///
/// This has the same hazards as [`stdin`].
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdin.html
/// [Linux]: https://man7.org/linux/man-pages/man3/stdin.3.html
#[doc(alias = "STDIN_FILENO")]
#[inline]
pub const fn raw_stdin() -> RawFd {
backend::io::types::STDIN_FILENO as RawFd
}
/// `STDOUT_FILENO`—Standard output, raw.
///
/// This is similar to [`stdout`], however it returns a `RawFd`.
///
/// # Other hazards
///
/// This has the same hazards as [`stdout`].
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stdout.html
/// [Linux]: https://man7.org/linux/man-pages/man3/stdout.3.html
#[doc(alias = "STDOUT_FILENO")]
#[inline]
pub const fn raw_stdout() -> RawFd {
backend::io::types::STDOUT_FILENO as RawFd
}
/// `STDERR_FILENO`—Standard error, raw.
///
/// This is similar to [`stderr`], however it returns a `RawFd`.
///
/// # Other hazards
///
/// This has the same hazards as [`stderr`].
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/stderr.html
/// [Linux]: https://man7.org/linux/man-pages/man3/stderr.3.html
#[doc(alias = "STDERR_FILENO")]
#[inline]
pub const fn raw_stderr() -> RawFd {
backend::io::types::STDERR_FILENO as RawFd
}