mirror of https://github.com/sharkdp/fd.git
99 lines
3.2 KiB
Rust
99 lines
3.2 KiB
Rust
// Copyright (c) 2017 fd developers
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// Licensed under the Apache License, Version 2.0
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// <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0>
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// or the MIT license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
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// at your option. All files in the project carrying such
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// notice may not be copied, modified, or distributed except
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// according to those terms.
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use std::process::Command;
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use std::sync::{Arc, Mutex};
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use std::io;
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/// Executes a command.
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#[cfg(not(unix))]
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pub fn execute_command(mut cmd: Command, out_perm: Arc<Mutex<()>>) {
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use std::process::Stdio;
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use std::io::Write;
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// Spawn the supplied command.
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let output = cmd.stdout(Stdio::piped()).stderr(Stdio::piped()).output();
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// Then wait for the command to exit, if it was spawned.
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match output {
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Ok(output) => {
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// While this lock is active, this thread will be the only thread allowed
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// to write it's outputs.
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let _lock = out_perm.lock().unwrap();
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let stdout = io::stdout();
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let stderr = io::stderr();
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let _ = stdout.lock().write_all(&output.stdout);
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let _ = stderr.lock().write_all(&output.stderr);
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}
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Err(why) => eprintln!("fd: exec error: {}", why),
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}
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}
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/// Executes a command.
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#[cfg(all(unix))]
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pub fn execute_command(mut cmd: Command, out_perm: Arc<Mutex<()>>) {
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use libc::{close, dup2, pipe, STDERR_FILENO, STDOUT_FILENO};
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use std::fs::File;
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use std::os::unix::process::CommandExt;
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use std::os::unix::io::FromRawFd;
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// Initial a pair of pipes that will be used to
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// pipe the std{out,err} of the spawned process.
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let mut stdout_fds = [0; 2];
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let mut stderr_fds = [0; 2];
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unsafe {
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pipe(stdout_fds.as_mut_ptr());
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pipe(stderr_fds.as_mut_ptr());
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}
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// Configure the pipes accordingly in the child.
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let child = cmd.before_exec(move || unsafe {
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// Redirect the child's std{out,err} to the write ends of our pipe.
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dup2(stdout_fds[1], STDOUT_FILENO);
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dup2(stderr_fds[1], STDERR_FILENO);
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// Close all the fds we created here, so EOF will be sent when the program exits.
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close(stdout_fds[0]);
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close(stdout_fds[1]);
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close(stderr_fds[0]);
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close(stderr_fds[1]);
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Ok(())
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}).spawn();
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// Open the read end of the pipes as `File`s.
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let (mut pout, mut perr) = unsafe {
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// Close the write ends of the pipes in the parent
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close(stdout_fds[1]);
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close(stderr_fds[1]);
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(
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// But create files from the read ends.
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File::from_raw_fd(stdout_fds[0]),
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File::from_raw_fd(stderr_fds[0]),
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)
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};
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match child {
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Ok(mut child) => {
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let _ = child.wait();
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// Create a lock to ensure that this thread has exclusive access to writing.
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let _lock = self.out_perm.lock().unwrap();
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// And then write the outputs of the process until EOF is sent to each file.
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let stdout = io::stdout();
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let stderr = io::stderr();
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let _ = io::copy(&mut pout, &mut stdout.lock());
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let _ = io::copy(&mut perr, &mut stderr.lock());
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}
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Err(why) => eprintln!("fd: exec error: {}", why),
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}
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}
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