Connor-GH
125 lines
3.4 KiB
Rust
125 lines
3.4 KiB
Rust
//! `fcntl.h` implementation.
|
|
//!
|
|
//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/fcntl.h.html>.
|
|
|
|
use core::num::NonZeroU64;
|
|
|
|
use crate::{
|
|
c_str::CStr,
|
|
error::ResultExt,
|
|
platform::{
|
|
Pal, Sys,
|
|
types::{c_char, c_int, c_short, c_ulonglong, mode_t, off_t, pid_t},
|
|
},
|
|
};
|
|
|
|
pub use self::sys::*;
|
|
|
|
use super::errno::EINVAL;
|
|
|
|
#[cfg(target_os = "linux")]
|
|
#[path = "linux.rs"]
|
|
pub mod sys;
|
|
|
|
#[cfg(target_os = "redox")]
|
|
#[path = "redox.rs"]
|
|
pub mod sys;
|
|
|
|
pub const F_DUPFD: c_int = 0;
|
|
pub const F_GETFD: c_int = 1;
|
|
pub const F_SETFD: c_int = 2;
|
|
pub const F_GETFL: c_int = 3;
|
|
pub const F_SETFL: c_int = 4;
|
|
pub const F_GETLK: c_int = 5;
|
|
pub const F_SETLK: c_int = 6;
|
|
pub const F_SETLKW: c_int = 7;
|
|
pub const F_OFD_GETLK: c_int = 36;
|
|
pub const F_OFD_SETLK: c_int = 37;
|
|
pub const F_OFD_SETLKW: c_int = 38;
|
|
pub const F_DUPFD_CLOEXEC: c_int = 1030;
|
|
|
|
pub const F_RDLCK: c_int = 0;
|
|
pub const F_WRLCK: c_int = 1;
|
|
pub const F_UNLCK: c_int = 2;
|
|
|
|
pub const F_ULOCK: c_int = 0;
|
|
pub const F_LOCK: c_int = 1;
|
|
pub const F_TLOCK: c_int = 2;
|
|
pub const F_TEST: c_int = 3;
|
|
|
|
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/creat.html>.
|
|
#[unsafe(no_mangle)]
|
|
pub unsafe extern "C" fn creat(path: *const c_char, mode: mode_t) -> c_int {
|
|
unsafe { open(path, O_WRONLY | O_CREAT | O_TRUNC, mode) }
|
|
}
|
|
|
|
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/fcntl.h.html>.
|
|
#[repr(C)]
|
|
#[derive(Clone, Copy, Default)]
|
|
pub struct flock {
|
|
pub l_type: c_short,
|
|
pub l_whence: c_short,
|
|
pub l_start: off_t,
|
|
pub l_len: off_t,
|
|
pub l_pid: pid_t,
|
|
}
|
|
|
|
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/fcntl.html>.
|
|
#[unsafe(no_mangle)]
|
|
pub unsafe extern "C" fn fcntl(fildes: c_int, cmd: c_int, mut __valist: ...) -> c_int {
|
|
// c_ulonglong
|
|
let arg = match cmd {
|
|
F_DUPFD | F_SETFD | F_SETFL | F_GETLK | F_SETLK | F_SETLKW | F_OFD_GETLK | F_OFD_SETLK
|
|
| F_OFD_SETLKW | F_DUPFD_CLOEXEC => unsafe { __valist.arg::<c_ulonglong>() },
|
|
_ => 0,
|
|
};
|
|
|
|
Sys::fcntl(fildes, cmd, arg).or_minus_one_errno()
|
|
}
|
|
|
|
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/open.html>.
|
|
#[unsafe(no_mangle)]
|
|
pub unsafe extern "C" fn open(path: *const c_char, oflag: c_int, mut __valist: ...) -> c_int {
|
|
unsafe { openat(AT_FDCWD, path, oflag, __valist) }
|
|
}
|
|
|
|
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/openat.html>.
|
|
#[unsafe(no_mangle)]
|
|
pub unsafe extern "C" fn openat(
|
|
fd: c_int,
|
|
path: *const c_char,
|
|
oflag: c_int,
|
|
mut __valist: ...
|
|
) -> c_int {
|
|
let mode = if oflag & O_CREAT == O_CREAT
|
|
/* || oflag & O_TMPFILE == O_TMPFILE */
|
|
{
|
|
unsafe { __valist.arg::<mode_t>() }
|
|
} else {
|
|
0
|
|
};
|
|
|
|
let path = unsafe { CStr::from_ptr(path) };
|
|
Sys::openat(fd, path, oflag, mode).or_minus_one_errno()
|
|
}
|
|
|
|
#[unsafe(no_mangle)]
|
|
pub unsafe extern "C" fn cbindgen_stupid_struct_user_for_fcntl(_: flock) {}
|
|
|
|
#[unsafe(no_mangle)]
|
|
pub unsafe extern "C" fn posix_fallocate(fd: c_int, offset: off_t, length: off_t) -> c_int {
|
|
// Length can't be zero and offset must be positive.
|
|
let Ok(offset) = offset.try_into() else {
|
|
return EINVAL;
|
|
};
|
|
let Some(length) = length.try_into().ok().and_then(NonZeroU64::new) else {
|
|
return EINVAL;
|
|
};
|
|
|
|
// posix_fallocate does not set errno but instead returns it.
|
|
Sys::posix_fallocate(fd, offset, length)
|
|
.err()
|
|
.map(|e| e.0)
|
|
.unwrap_or_default()
|
|
}
|