[Octave-bug-tracker] [bug #45625] fork on command line

[Mike Miller]

Follow-up Comment #6, bug #45625 (project octave):

So besides Rik's point about making the fork function error if a user tries to
call it from the top level, there is another lower-level bug here with fork
and the Qt libraries.

The following script works fine for me with --no-gui-libs (octave-cli), but
hangs as Ceral describes when I run it in the GUI or with --no-gui (meaning
Qt's event loop is still running).


function fork_test ()
  pid = fork ();
  if (pid != 0)
    printf ("waiting for child process %d…", pid);
    fflush (stdout);
    [~, sts] = waitpid (pid);
    printf (" done: %d\n", WEXITSTATUS (sts));
  else
    pause (3);
    exit (3);
  endif
endfunction


I think this hang may be related to bug #38305, where it was observed that
there is some interference between the way Octave and Qt both want to manage
child processes. I don't have an exact explanation but it certainly seems
related.

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