# tokio-command-fds
A library for passing arbitrary file descriptors when spawning child processes.
(Forked from https://github.com/google/command-fds to add support for tokio)
## Example
```rust
#[tokio::main(flavor="current_thread")]
async fn main() {
use tokio_command_fds::{CommandFdExt, FdMapping};
use std::fs::File;
use std::os::unix::io::AsRawFd;
use tokio::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 = tokio::process::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().await.unwrap();
}
```
## License
Licensed under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0).