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//! linux_raw syscalls supporting `rustix::io_uring`.
//!
//! # Safety
//!
//! See the `rustix::backend::syscalls` module documentation for details.
#![allow(unsafe_code, clippy::undocumented_unsafe_blocks)]
use crate::backend::conv::{by_mut, c_uint, pass_usize, ret_c_uint, ret_owned_fd};
use crate::fd::{BorrowedFd, OwnedFd};
use crate::io;
use crate::io_uring::{io_uring_params, IoringEnterFlags, IoringRegisterOp};
use core::ffi::c_void;
#[inline]
pub(crate) fn io_uring_setup(entries: u32, params: &mut io_uring_params) -> io::Result<OwnedFd> {
unsafe {
ret_owned_fd(syscall!(
__NR_io_uring_setup,
c_uint(entries),
by_mut(params)
))
}
}
#[inline]
pub(crate) unsafe fn io_uring_register(
fd: BorrowedFd<'_>,
opcode: IoringRegisterOp,
arg: *const c_void,
nr_args: u32,
) -> io::Result<u32> {
ret_c_uint(syscall_readonly!(
__NR_io_uring_register,
fd,
c_uint(opcode as u32),
arg,
c_uint(nr_args)
))
}
#[inline]
pub(crate) unsafe fn io_uring_enter(
fd: BorrowedFd<'_>,
to_submit: u32,
min_complete: u32,
flags: IoringEnterFlags,
arg: *const c_void,
size: usize,
) -> io::Result<u32> {
// This is not `_readonly` because `io_uring_enter` waits for I/O to
// complete, and I/O could involve writing to memory buffers, which
// could be a side effect depended on by the caller.
ret_c_uint(syscall!(
__NR_io_uring_enter,
fd,
c_uint(to_submit),
c_uint(min_complete),
flags,
arg,
pass_usize(size)
))
}