2 /// # valac --pkg gio-2.0 --pkg posix Spawn.vala -o /tmp/Spawn
10 * x = new Spawn( "/tmp", {"ls", "-l" })
12 * // these are optionall..
13 * x.env = ..... (if you need to set one...
14 * x.output_line.connect((string str) => {
15 * if ( Gtk.events_pending()) { Gtk.main_iteration(); }
17 * x.input_line.connect(() => { return string });
19 * x.run((int res, string output, string stderr) => { ... });
27 public errordomain SpawnError {
36 * @param cwd {String} working directory. (defaults to home directory)
37 * @param args {Array} arguments eg. [ 'ls', '-l' ]
40 * @arg env {Array} enviroment eg. [ 'GITDIR=/home/test' ]
41 * @arg is_async {Boolean} (optional)return instantly, or wait for exit. (default no)
42 * @arg trhow_exceptions {Boolean} throw exception on failure (default no)
47 public class Spawn : Object
50 * @signal input called at start to send input when process starts?
51 * @return the string or null
53 public signal string? input();
55 * @signal complete called at when the command has completed.
58 public signal void complete(int res, string str, string stderr);
60 * @signal output_line called when a line is recieved from the process.
61 * Note you may want to connect this and run
62 * if ( Gtk.events_pending()) { Gtk.main_iteration(); }
66 public signal void output_line(string str);
72 public bool is_async = true;
73 public bool throw_exceptions = false;
74 public bool detach = false;
76 public Spawn(string cwd, string[] args) throws Error
87 this.cwd = this.cwd.length < 1 ? GLib.Environment.get_home_dir() : this.cwd;
88 if (this.args.length < 0) {
89 throw new SpawnError.NO_ARGS("No arguments");
96 MainLoop ctx = null; // the mainloop ctx.
99 * @property output {String} resulting output
101 public string output;
103 * @property stderr {String} resulting output from stderr
105 public string stderr;
107 * @property result {Number} execution result.
109 public int result= 0;
111 * @property pid {Number} pid of child process (of false if it's not running)
115 * @property in_ch {GLib.IOChannel} input io channel
117 IOChannel in_ch = null;
119 * @property out_ch {GLib.IOChannel} output io channel
121 IOChannel out_ch = null;
123 * @property err_ch {GLib.IOChannel} stderr io channel
125 IOChannel err_ch = null;
127 * @property err_src {int} the watch for errors
132 * @property err_src {int} the watch for output
139 * Run the configured command.
140 * result is applied to object properties (eg. '?' or 'stderr')
141 * @returns {Object} self.
143 public void run( ) throws SpawnError, GLib.SpawnError, GLib.IOChannelError
155 GLib.debug("cd %s; %s" , this.cwd , string.joinv(" ", this.args));
158 Process.spawn_async_with_pipes (
161 this.env.length > 0 ? this.env : null,
162 SpawnFlags.SEARCH_PATH | SpawnFlags.DO_NOT_REAP_CHILD,
165 ChildWatch.add (this.pid, (pid, status) => {
166 // Triggered when the child indicated by child_pid exits
167 Process.close_pid (pid);
174 Process.spawn_async_with_pipes (
177 this.env.length > 0 ? this.env : null,
178 SpawnFlags.SEARCH_PATH | SpawnFlags.DO_NOT_REAP_CHILD,
190 //print(JSON.stringify(gret));
192 GLib.debug("PID: %d" ,this.pid);
195 this.in_ch = new GLib.IOChannel.unix_new(standard_input);
196 this.out_ch = new GLib.IOChannel.unix_new(standard_output);
197 this.err_ch = new GLib.IOChannel.unix_new(standard_error);
199 // make everything non-blocking!
203 // using NONBLOCKING only works if io_add_watch
204 //returns true/false in right conditions
205 this.in_ch.set_flags (GLib.IOFlags.NONBLOCK);
206 this.out_ch.set_flags (GLib.IOFlags.NONBLOCK);
207 this.err_ch.set_flags (GLib.IOFlags.NONBLOCK);
212 ChildWatch.add (this.pid, (w_pid, result) => {
214 this.result = result;
215 GLib.debug("child_watch_add : result:%d ", result);
218 this.read(this.out_ch);
219 this.read(this.err_ch);
222 Process.close_pid(this.pid);
224 if (this.ctx != null) {
229 //print("DONE TIDYUP");
231 this.complete(this.result, this.output, this.stderr);
240 // add handlers for output and stderr.
242 this.out_src = (int) this.out_ch.add_watch (
243 IOCondition.OUT | IOCondition.IN | IOCondition.PRI | IOCondition.HUP | IOCondition.ERR ,
244 (channel, condition) => {
245 return this.read(this.out_ch);
248 this.err_src = (int) this.err_ch.add_watch (
249 IOCondition.OUT | IOCondition.IN | IOCondition.PRI | IOCondition.HUP | IOCondition.ERR ,
250 (channel, condition) => {
251 return this.read(this.err_ch);
258 // child can exit before we get this far..
259 var input = this.input();
264 // this probably needs to be a bit smarter...
265 //but... let's close input now..
266 this.in_ch.shutdown(true);
280 // async - if running - return..
281 if (this.is_async && this.pid > -1) {
285 // start mainloop if not async..
288 GLib.debug("starting main loop");
289 //if (this.cfg.debug) {
292 this.ctx = new MainLoop ();
293 this.ctx.run(); // wait fore exit?
295 GLib.debug("main_loop done!");
297 this.tidyup(); // tidyup get's called in main loop.
300 if (this.throw_exceptions && this.result != 0) {
302 throw new SpawnError.EXECUTE_ERROR(this.stderr);
303 //this.toString = function() { return this.stderr; };
304 ///throw new Exception this; // we throw self...
307 // finally throw, or return self..
315 private void tidyup()
318 Process.close_pid(this.pid); // hopefully kills it..
322 if (this.in_ch != null) this.in_ch.shutdown(true);
323 if (this.out_ch != null) this.out_ch.shutdown(true);
324 if (this.err_ch != null) this.err_ch.shutdown(true);
326 // error shutting donw.
328 // blank out channels
332 // rmeove listeners !! important otherwise we kill the CPU
333 //if (this.err_src > -1 ) GLib.source_remove(this.err_src);
334 //if (this.out_src > -1 ) GLib.source_remove(this.out_src);
342 * write to stdin of process
343 * @arg str {String} string to write to stdin of process
344 * @returns GLib.IOStatus (0 == error, 1= NORMAL)
346 private int write(string str) throws Error // write a line to
348 if (this.in_ch == null) {
349 return 0; // input is closed
351 //print("write: " + str);
352 // NEEDS GIR FIX! for return value.. let's ignore for the time being..
355 var res = this.in_ch.write_chars(str.to_utf8(), out written);
357 //print("write_char retunred:" + JSON.stringify(res) + ' ' +JSON.stringify(ret) );
359 if (res != GLib.IOStatus.NORMAL) {
360 throw new SpawnError.WRITE_ERROR("Write failed");
370 * read from pipe and call appropriate listerner and add to output or stderr string.
371 * @arg giochannel to read from.
374 private bool read(IOChannel ch)
376 // string prop = (ch == this.out_ch) ? "output" : "stderr";
377 // print("prop: " + prop);
380 //print(JSON.stringify(ch, null,4));
387 status = ch.read_line( out buffer, out len, out term_pos );
394 // print('status: ' +JSON.stringify(status));
395 // print(JSON.stringify(x));
397 case GLib.IOStatus.NORMAL:
401 //if (this.listeners[prop]) {
402 // this.listeners[prop].call(this, x.str_return);
404 if (ch == this.out_ch) {
405 this.output += buffer;
406 this.output_line( buffer);
409 this.stderr += buffer;
410 this.output_line( buffer);
412 //_this[prop] += x.str_return;
413 //if (this.cfg.debug) {
414 //GLib.debug("%s : %s", prop , buffer);
418 //if ( Gtk.events_pending()) {
419 // Gtk.main_iteration();
424 //this.ctx.iteration(true);
426 case GLib.IOStatus.AGAIN:
427 //print("Should be called again.. waiting for more data..");
430 case GLib.IOStatus.ERROR:
431 case GLib.IOStatus.EOF:
439 //print("RETURNING");
440 return false; // allow it to be called again..
446 int main (string[] args) {
447 GLib.Log.set_handler(null,
448 GLib.LogLevelFlags.LEVEL_DEBUG | GLib.LogLevelFlags.LEVEL_WARNING,
450 print("%s: %s\n", dom, msg);
453 var ctx = new GLib.MainLoop ();
454 var a = new Spawn("", { "ls" , "-l"});
455 a.run((res, str, stderr) => {
461 ctx.run(); // wait for exit?