Implement pidfd APIs for Linux #1859
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Seems we had the same idea #1868 |
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Dec 11, 2022
1923: feat: I/O safety for 'sys/wait' r=asomers a=SteveLauC
#### What this PR does:
1. Adds I/O safety for `sys/wait`
----------
Actually, I am not sure about which type to use here:
```rust
pub enum Id<'fd> {
/// Wait for the child referred to by the given PID file descriptor
#[cfg(any(target_os = "android", target_os = "linux"))]
PIDFd(RawFd),
PIDFd(BorrowedFd<'fd>),
}
```
If we use `Fd: AsFd`
```rust
pub enum Id<'fd, Fd: AsFd> {
/// Wait for the child referred to by the given PID file descriptor
#[cfg(any(target_os = "android", target_os = "linux"))]
PIDFd(RawFd),
PIDFd(&'fd Fd),
}
```
then the user has to specify that generic type when using this interface, which is kinda user-unfriendly...
------
The typical usage of this interface will be something like:
```rust
// Thought currently we don't have pidfd_open(2) in `Nix`
let fd_referring_to_a_process: OwnedFd = pidfd_open().unwrap();
let status = waitid(Id::PIDFd(fd_referring_to_a_process), WaitPidFlag::XXXX).unwrap();
```
UPDATE: `pidfd_open(2)` will be added in #1859 or #1868 .
Co-authored-by: Steve Lau <stevelauc@outlook.com>
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PID file descriptors are file descriptors that refers to processes. This is a Linux specific API.
The use case is described in the manual of pidfd_open.
Added syscall wrappers:
pidfd_open(2)pidfd_getfd(2)pidfd_send_signal(2)