gjs-io-sample.js

gjs-io-sample.js

const GLib = imports.gi.GLib;
const Gio = imports.gi.Gio;

let [res, out, err, status] = GLib.spawn_command_line_sync('ls -la');
print(out);

let [res, out] = GLib.spawn_command_line_sync('ls -la');
print(out);

let [res, out] = GLib.spawn_sync(null, ['/bin/ls', '-la'], null, 0, null);
print(out);

let [res, out] = GLib.spawn_sync(GLib.getenv('HOME'), ['/bin/ls', '-la'], null, 0, null);
print(out);

let [res, out] = GLib.spawn_sync(null, ['ls', '-la'], null, GLib.SpawnFlags.SEARCH_PATH, null);
print(out);

GLib.spawn_command_line_async('ls -la');

let [res, pid, in_fd, out_fd, err_fd]  = GLib.spawn_async_with_pipes(null, ['/bin/cat'], null, 0, null);
let out_reader = new Gio.DataInputStream({
  base_stream: new Gio.UnixInputStream({fd: out_fd})
});
let in_writer = new Gio.DataOutputStream({
  base_stream: new Gio.UnixOutputStream({fd: in_fd})
});
let data = ["hoge", "fuga", ""].join("\n");
in_writer.put_string(data, null);
let [out, size] = out_reader.read_line(null);
print(out);
let [out, size] = out_reader.read_line(null);
print(out);

When I developed a cinnamon applet it helped me to out.toString(), because out is not string!

After a few iterations of calling spawn_async_with_pipes() I get the error 'Failed to create pipe for communicating with child process (Too many open files)' I tried closing everything I can, but I must be missing something.

With output:

let [result, stdout, stderr] = GLib.spawn_command_line_sync(command);

For those finding this in a search, there's a good example of a asynchronous file reader class here: https://github.com/optimisme/gjs-examples/blob/master/egSpawn.js