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use crate::process::Pid;
use crate::{backend, io};
use bitflags::bitflags;
#[cfg(target_os = "linux")]
use crate::fd::BorrowedFd;
bitflags! {
/// Options for modifying the behavior of wait/waitpid
pub struct WaitOptions: u32 {
/// Return immediately if no child has exited.
const NOHANG = backend::process::wait::WNOHANG as _;
/// Return if a child has stopped (but not traced via `ptrace(2)`)
const UNTRACED = backend::process::wait::WUNTRACED as _;
/// Return if a stopped child has been resumed by delivery of `SIGCONT`
const CONTINUED = backend::process::wait::WCONTINUED as _;
}
}
#[cfg(not(any(target_os = "wasi", target_os = "redox", target_os = "openbsd")))]
bitflags! {
/// Options for modifying the behavior of waitid
pub struct WaitidOptions: u32 {
/// Return immediately if no child has exited.
const NOHANG = backend::process::wait::WNOHANG as _;
/// Return if a stopped child has been resumed by delivery of `SIGCONT`
const CONTINUED = backend::process::wait::WCONTINUED as _;
/// Wait for processed that have exited.
const EXITED = backend::process::wait::WEXITED as _;
/// Keep processed in a waitable state.
const NOWAIT = backend::process::wait::WNOWAIT as _;
/// Wait for processes that have been stopped.
const STOPPED = backend::process::wait::WSTOPPED as _;
}
}
/// the status of the child processes the caller waited on
#[derive(Debug, Clone, Copy)]
pub struct WaitStatus(u32);
impl WaitStatus {
/// create a `WaitStatus` out of an integer.
#[inline]
pub(crate) fn new(status: u32) -> Self {
Self(status)
}
/// Converts a `WaitStatus` into its raw representation as an integer.
#[inline]
pub const fn as_raw(self) -> u32 {
self.0
}
/// Returns whether the process is currently stopped.
#[inline]
pub fn stopped(self) -> bool {
backend::process::wait::WIFSTOPPED(self.0 as _)
}
/// Returns whether the process has continued from a job control stop.
#[inline]
pub fn continued(self) -> bool {
backend::process::wait::WIFCONTINUED(self.0 as _)
}
/// Returns the number of the signal that stopped the process,
/// if the process was stopped by a signal.
#[inline]
pub fn stopping_signal(self) -> Option<u32> {
if self.stopped() {
Some(backend::process::wait::WSTOPSIG(self.0 as _) as _)
} else {
None
}
}
/// Returns the exit status number returned by the process,
/// if it exited normally.
#[inline]
pub fn exit_status(self) -> Option<u32> {
if backend::process::wait::WIFEXITED(self.0 as _) {
Some(backend::process::wait::WEXITSTATUS(self.0 as _) as _)
} else {
None
}
}
/// Returns the number of the signal that terminated the process,
/// if the process was terminated by a signal.
#[inline]
pub fn terminating_signal(self) -> Option<u32> {
if backend::process::wait::WIFSIGNALED(self.0 as _) {
Some(backend::process::wait::WTERMSIG(self.0 as _) as _)
} else {
None
}
}
}
/// The status of a process after calling [`waitid`].
#[derive(Clone, Copy)]
#[cfg(not(any(target_os = "wasi", target_os = "redox", target_os = "openbsd")))]
pub struct WaitidStatus(pub(crate) backend::c::siginfo_t);
/// The identifier to wait on in a call to [`waitid`].
#[cfg(not(any(target_os = "wasi", target_os = "redox", target_os = "openbsd")))]
#[derive(Debug, Clone)]
#[non_exhaustive]
pub enum WaitId<'a> {
/// Wait on all processes.
All,
/// Wait for a specific process ID.
Pid(Pid),
/// Wait for a specific process file descriptor.
#[cfg(target_os = "linux")]
PidFd(BorrowedFd<'a>),
/// Eat the lifetime for non-Linux platforms.
#[doc(hidden)]
#[cfg(not(target_os = "linux"))]
__EatLifetime(std::marker::PhantomData<&'a ()>),
// TODO(notgull): Once this crate has the concept of PGIDs, add a WaitId::Pgid
}
/// `waitpid(pid, waitopts)`—Wait for a specific process to change state.
///
/// If the pid is `None`, the call will wait for any child process whose
/// process group id matches that of the calling process.
///
/// If the pid is equal to `RawPid::MAX`, the call will wait for any child
/// process.
///
/// Otherwise if the `wrapping_neg` of pid is less than pid, the call will wait
/// for any child process with a group ID equal to the `wrapping_neg` of `pid`.
///
/// Otherwise, the call will wait for the child process with the given pid.
///
/// On Success, returns the status of the selected process.
///
/// If `NOHANG` was specified in the options, and the selected child process
/// didn't change state, returns `None`.
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/wait.html
/// [Linux]: https://man7.org/linux/man-pages/man2/waitpid.2.html
#[cfg(not(target_os = "wasi"))]
#[inline]
pub fn waitpid(pid: Option<Pid>, waitopts: WaitOptions) -> io::Result<Option<WaitStatus>> {
Ok(backend::process::syscalls::waitpid(pid, waitopts)?.map(|(_, status)| status))
}
/// `wait(waitopts)`—Wait for any of the children of calling process to
/// change state.
///
/// On success, returns the pid of the child process whose state changed, and
/// the status of said process.
///
/// If `NOHANG` was specified in the options, and the selected child process
/// didn't change state, returns `None`.
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/wait.html
/// [Linux]: https://man7.org/linux/man-pages/man2/waitpid.2.html
#[cfg(not(target_os = "wasi"))]
#[inline]
pub fn wait(waitopts: WaitOptions) -> io::Result<Option<(Pid, WaitStatus)>> {
backend::process::syscalls::wait(waitopts)
}
/// `waitid(_, _, _, opts)`—Wait for the specified child process to change
/// state.
#[cfg(not(any(target_os = "wasi", target_os = "redox", target_os = "openbsd")))]
#[inline]
pub fn waitid<'a>(
id: impl Into<WaitId<'a>>,
options: WaitidOptions,
) -> io::Result<Option<WaitidStatus>> {
backend::process::syscalls::waitid(id.into(), options)
}
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