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);}
The current process-group id is inherited across fork() and execve() - see their respective man pages. So if you reorder the operations so setsid() occurs before [task launch], then the child inherits automatically.
This doesn't mean the child can't change its own pgid/sid. And since you mention a shell, it's not unusual for shells to do exactly that.
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