#![allow(unsafe_code)]
#![allow(clippy::undocumented_unsafe_blocks)]
use super::super::c;
#[cfg(target_arch = "x86")]
use super::super::conv::by_mut;
use super::super::conv::{
by_ref, c_int, c_uint, ret, ret_c_int, ret_c_uint, ret_error, ret_usize_infallible, size_of,
zero,
};
#[cfg(feature = "fs")]
use crate::fd::BorrowedFd;
use crate::ffi::CStr;
#[cfg(feature = "fs")]
use crate::fs::AtFlags;
use crate::io;
use crate::process::{Pid, RawNonZeroPid, Signal};
use crate::runtime::{How, Sigaction, Siginfo, Sigset, Stack, Timespec};
use crate::utils::optional_as_ptr;
#[cfg(target_pointer_width = "32")]
use core::convert::TryInto;
use core::mem::MaybeUninit;
#[cfg(target_pointer_width = "32")]
use linux_raw_sys::general::__kernel_old_timespec;
use linux_raw_sys::general::{__kernel_pid_t, kernel_sigset_t, PR_SET_NAME, SIGCHLD};
#[cfg(target_arch = "x86_64")]
use {super::super::conv::ret_infallible, linux_raw_sys::general::ARCH_SET_FS};
#[inline]
pub(crate) unsafe fn fork() -> io::Result<Option<Pid>> {
let pid = ret_c_uint(syscall_readonly!(
__NR_clone,
c_uint(SIGCHLD),
zero(),
zero(),
zero(),
zero()
))?;
Ok(Pid::from_raw(pid))
}
#[cfg(feature = "fs")]
pub(crate) unsafe fn execveat(
dirfd: BorrowedFd<'_>,
path: &CStr,
args: *const *const u8,
env_vars: *const *const u8,
flags: AtFlags,
) -> io::Errno {
ret_error(syscall_readonly!(
__NR_execveat,
dirfd,
path,
args,
env_vars,
flags
))
}
pub(crate) unsafe fn execve(
path: &CStr,
args: *const *const u8,
env_vars: *const *const u8,
) -> io::Errno {
ret_error(syscall_readonly!(__NR_execve, path, args, env_vars))
}
pub(crate) mod tls {
#[cfg(target_arch = "x86")]
use super::super::tls::UserDesc;
use super::*;
#[cfg(target_arch = "x86")]
#[inline]
pub(crate) unsafe fn set_thread_area(u_info: &mut UserDesc) -> io::Result<()> {
ret(syscall!(__NR_set_thread_area, by_mut(u_info)))
}
#[cfg(target_arch = "arm")]
#[inline]
pub(crate) unsafe fn arm_set_tls(data: *mut c::c_void) -> io::Result<()> {
ret(syscall_readonly!(__ARM_NR_set_tls, data))
}
#[cfg(target_arch = "x86_64")]
#[inline]
pub(crate) unsafe fn set_fs(data: *mut c::c_void) {
ret_infallible(syscall_readonly!(
__NR_arch_prctl,
c_uint(ARCH_SET_FS),
data
))
}
#[inline]
pub(crate) unsafe fn set_tid_address(data: *mut c::c_void) -> Pid {
let tid: i32 =
ret_usize_infallible(syscall_readonly!(__NR_set_tid_address, data)) as __kernel_pid_t;
debug_assert_ne!(tid, 0);
Pid::from_raw_nonzero(RawNonZeroPid::new_unchecked(tid as u32))
}
#[inline]
pub(crate) unsafe fn set_thread_name(name: &CStr) -> io::Result<()> {
ret(syscall_readonly!(__NR_prctl, c_uint(PR_SET_NAME), name))
}
#[inline]
pub(crate) fn exit_thread(code: c::c_int) -> ! {
unsafe { syscall_noreturn!(__NR_exit, c_int(code)) }
}
}
#[inline]
pub(crate) unsafe fn sigaction(signal: Signal, new: Option<Sigaction>) -> io::Result<Sigaction> {
let mut old = MaybeUninit::<Sigaction>::uninit();
let new = optional_as_ptr(new.as_ref());
ret(syscall!(
__NR_rt_sigaction,
signal,
new,
&mut old,
size_of::<kernel_sigset_t, _>()
))?;
Ok(old.assume_init())
}
#[inline]
pub(crate) unsafe fn sigaltstack(new: Option<Stack>) -> io::Result<Stack> {
let mut old = MaybeUninit::<Stack>::uninit();
let new = optional_as_ptr(new.as_ref());
ret(syscall!(__NR_sigaltstack, new, &mut old))?;
Ok(old.assume_init())
}
#[inline]
pub(crate) unsafe fn tkill(tid: Pid, sig: Signal) -> io::Result<()> {
ret(syscall_readonly!(__NR_tkill, tid, sig))
}
#[inline]
pub(crate) unsafe fn sigprocmask(how: How, new: Option<&Sigset>) -> io::Result<Sigset> {
let mut old = MaybeUninit::<Sigset>::uninit();
let new = optional_as_ptr(new);
ret(syscall!(
__NR_rt_sigprocmask,
how,
new,
&mut old,
size_of::<kernel_sigset_t, _>()
))?;
Ok(old.assume_init())
}
#[inline]
pub(crate) fn sigwait(set: &Sigset) -> io::Result<Signal> {
unsafe {
match Signal::from_raw(ret_c_int(syscall_readonly!(
__NR_rt_sigtimedwait,
by_ref(set),
zero(),
zero(),
size_of::<kernel_sigset_t, _>()
))?) {
Some(signum) => Ok(signum),
None => Err(io::Errno::NOTSUP),
}
}
}
#[inline]
pub(crate) fn sigwaitinfo(set: &Sigset) -> io::Result<Siginfo> {
let mut info = MaybeUninit::<Siginfo>::uninit();
unsafe {
let _signum = ret_c_int(syscall!(
__NR_rt_sigtimedwait,
by_ref(set),
&mut info,
zero(),
size_of::<kernel_sigset_t, _>()
))?;
Ok(info.assume_init())
}
}
#[inline]
pub(crate) fn sigtimedwait(set: &Sigset, timeout: Option<Timespec>) -> io::Result<Siginfo> {
let mut info = MaybeUninit::<Siginfo>::uninit();
let timeout_ptr = optional_as_ptr(timeout.as_ref());
#[cfg(target_pointer_width = "32")]
unsafe {
match ret_c_int(syscall!(
__NR_rt_sigtimedwait_time64,
by_ref(set),
&mut info,
timeout_ptr,
size_of::<kernel_sigset_t, _>()
)) {
Ok(_signum) => (),
Err(io::Errno::NOSYS) => sigtimedwait_old(set, timeout, &mut info)?,
Err(err) => return Err(err),
}
Ok(info.assume_init())
}
#[cfg(target_pointer_width = "64")]
unsafe {
let _signum = ret_c_int(syscall!(
__NR_rt_sigtimedwait,
by_ref(set),
&mut info,
timeout_ptr,
size_of::<kernel_sigset_t, _>()
))?;
Ok(info.assume_init())
}
}
#[cfg(target_pointer_width = "32")]
unsafe fn sigtimedwait_old(
set: &Sigset,
timeout: Option<Timespec>,
info: &mut MaybeUninit<Siginfo>,
) -> io::Result<()> {
let old_timeout = match timeout {
Some(timeout) => Some(__kernel_old_timespec {
tv_sec: timeout.tv_sec.try_into().map_err(|_| io::Errno::OVERFLOW)?,
tv_nsec: timeout.tv_nsec as _,
}),
None => None,
};
let old_timeout_ptr = optional_as_ptr(old_timeout.as_ref());
let _signum = ret_c_int(syscall!(
__NR_rt_sigtimedwait,
by_ref(set),
info,
old_timeout_ptr,
size_of::<kernel_sigset_t, _>()
))?;
Ok(())
}