Crate command_fds
source ·Expand description
A library for passing arbitrary file descriptors when spawning child processes.
Example
use command_fds::{CommandFdExt, FdMapping};
use std::fs::File;
use std::os::unix::io::AsRawFd;
use std::process::Command;
// Open a file.
let file = File::open("Cargo.toml").unwrap();
// Prepare to run `ls -l /proc/self/fd` with some FDs mapped.
let mut command = Command::new("ls");
command.arg("-l").arg("/proc/self/fd");
command
.fd_mappings(vec![
// Map `file` as FD 3 in the child process.
FdMapping {
parent_fd: file.as_raw_fd(),
child_fd: 3,
},
// Map this process's stdin as FD 5 in the child process.
FdMapping {
parent_fd: 0,
child_fd: 5,
},
])
.unwrap();
// Spawn the child process.
let mut child = command.spawn().unwrap();
child.wait().unwrap();
Structs
- A mapping from a file descriptor in the parent to a file descriptor in the child, to be applied when spawning a child process.
- Error setting up FD mappings, because there were two or more mappings for the same child FD.
Traits
- Extension to add file descriptor mappings to a
Command
.