My app generates a task using NSTask(). If my app is killed or calls abort() - which equates to raise(SIGABRT) - then it would be desirable that the child die too.
If I have the code for the launched task then a kqueue comes to the rescue: http://old.nabble.com/Ensure-NSTask-terminates-when-parent-application-does-td22510014.html However, if I launch a shell this option isn't available. So process groups come to mind. However calling setpgid (see code below) seems to fail however with RPERM - operation not allowed. Is this an OS X POSIX process implementation detail or a consequence of the interior NSTask fork() implementation? I know that there are some OS NSTask substitutes available but I am not certain that that is the answer. My only thought is to install a Cocoa friendly signal handler and explicitly terminate the child. But there is no guarantee that this sort of post trauma cleanup will always succeed. Process group code: // launch the task [task launch]; pid_t group = setsid(); if (group == -1) { NSLog(@"setsid() == -1"); group = getpgrp(); } if (setpgid([task processIdentifier], group) == -1) { NSLog(@"unable to put task into same group as self: errno = %i", errno); } NSLog(@"new task process id = %i", [task processIdentifier]); NSLog(@"pgid = %i", group); Regards Jonathan Mitchell Developer Mugginsoft LLP http://www.mugginsoft.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
