std/sys/pal/unix/linux/
pidfd.rs

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1use crate::io;
2use crate::os::fd::{AsRawFd, FromRawFd, RawFd};
3use crate::sys::cvt;
4use crate::sys::pal::unix::fd::FileDesc;
5use crate::sys::process::ExitStatus;
6use crate::sys_common::{AsInner, FromInner, IntoInner};
7
8#[cfg(test)]
9mod tests;
10
11#[derive(Debug)]
12pub(crate) struct PidFd(FileDesc);
13
14impl PidFd {
15    pub fn kill(&self) -> io::Result<()> {
16        cvt(unsafe {
17            libc::syscall(
18                libc::SYS_pidfd_send_signal,
19                self.0.as_raw_fd(),
20                libc::SIGKILL,
21                crate::ptr::null::<()>(),
22                0,
23            )
24        })
25        .map(drop)
26    }
27
28    pub fn wait(&self) -> io::Result<ExitStatus> {
29        let mut siginfo: libc::siginfo_t = unsafe { crate::mem::zeroed() };
30        cvt(unsafe {
31            libc::waitid(libc::P_PIDFD, self.0.as_raw_fd() as u32, &mut siginfo, libc::WEXITED)
32        })?;
33        Ok(ExitStatus::from_waitid_siginfo(siginfo))
34    }
35
36    pub fn try_wait(&self) -> io::Result<Option<ExitStatus>> {
37        let mut siginfo: libc::siginfo_t = unsafe { crate::mem::zeroed() };
38
39        cvt(unsafe {
40            libc::waitid(
41                libc::P_PIDFD,
42                self.0.as_raw_fd() as u32,
43                &mut siginfo,
44                libc::WEXITED | libc::WNOHANG,
45            )
46        })?;
47        if unsafe { siginfo.si_pid() } == 0 {
48            Ok(None)
49        } else {
50            Ok(Some(ExitStatus::from_waitid_siginfo(siginfo)))
51        }
52    }
53}
54
55impl AsInner<FileDesc> for PidFd {
56    fn as_inner(&self) -> &FileDesc {
57        &self.0
58    }
59}
60
61impl IntoInner<FileDesc> for PidFd {
62    fn into_inner(self) -> FileDesc {
63        self.0
64    }
65}
66
67impl FromInner<FileDesc> for PidFd {
68    fn from_inner(inner: FileDesc) -> Self {
69        Self(inner)
70    }
71}
72
73impl FromRawFd for PidFd {
74    unsafe fn from_raw_fd(fd: RawFd) -> Self {
75        Self(FileDesc::from_raw_fd(fd))
76    }
77}
std/sys/pal/unix/linux/pidfd.rs

std/sys/pal/unix/linux/
pidfd.rs
