auronandace
88 lines
3.1 KiB
Rust
88 lines
3.1 KiB
Rust
//! `sys/wait.h` implementation.
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//!
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//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_wait.h.html>.
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use crate::{
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error::ResultExt,
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out::Out,
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platform::{
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Pal, Sys,
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types::{c_int, pid_t},
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},
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};
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/// Do not hang if no status is available; return immediately.
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pub const WNOHANG: c_int = 1;
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/// Report status of stopped child process.
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pub const WUNTRACED: c_int = 2;
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/// Report status of continued child process.
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pub const WCONTINUED: c_int = 8;
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/// Status is returned for any child that has stopped upon receipt of a signal.
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pub const WSTOPPED: c_int = 2;
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/// Wait for processes that have terminated.
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pub const WEXITED: c_int = 4;
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/// Keep the process whose status is returned in `infop` in a waitable state.
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pub const WNOWAIT: c_int = 0x0100_0000;
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/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man2/waitpid.2.html>.
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///
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/// Do not wait for children of other threads in the same thread group.
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pub const __WNOTHREAD: c_int = 0x2000_0000;
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/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man2/waitpid.2.html>.
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///
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/// Wait for all children regardless of type ("clone" or "non-clone").
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pub const __WALL: c_int = 0x4000_0000;
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/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man2/waitpid.2.html>.
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///
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/// Wait for "clone" children only.
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#[allow(overflowing_literals)]
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pub const __WCLONE: c_int = 0x8000_0000;
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/wait.html>.
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///
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/// Obtains status information pertaining to one of the caller's child
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/// processes.
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///
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/// If returning because the status of a child process is available, returns a
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/// value equal to the process ID of the child process for which status is
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/// reported. If returning due to the delivery of a signal to the calling
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/// process, returns `-1` and sets errno to `EINTR`. If otherwise failing,
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/// returns `-1` and sets errno.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn wait(stat_loc: *mut c_int) -> pid_t {
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unsafe { waitpid(!0, stat_loc, 0) }
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}
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/*
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* TODO: implement idtype_t, id_t, and siginfo_t
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*
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* #[unsafe(no_mangle)]
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* pub unsafe extern "C" fn waitid(
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* idtype: idtype_t,
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* id: id_t,
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* infop: siginfo_t,
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* options: c_int
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* ) -> c_int {
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* unimplemented!();
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* }
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*/
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/waitpid.html>.
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///
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/// Obtains status information pertaining to one of the caller's child
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/// processes.
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///
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/// If returning because the status of a child process is available, returns a
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/// value equal to the process ID of the child process for which status is
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/// reported. If returning due to the delivery of a signal to the calling
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/// process, returns `-1` and sets errno to `EINTR`. if invoked with `WNOHANG`
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/// set in `options`, it has at least one child process specified by `pid` for
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/// wchich status is not available, and status is not available for any process
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/// specified by `pid`, `0` is returned. If otherwise failing, returns `-1` and
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/// sets errno.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn waitpid(pid: pid_t, stat_loc: *mut c_int, options: c_int) -> pid_t {
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Sys::waitpid(pid, unsafe { Out::nullable(stat_loc) }, options).or_minus_one_errno()
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}
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