Hi,
I'm writing an app that uses an NSTask to spawn a long-lived process.
When my app is force-quit or otherwise SIGKILLed, the spawned process
gets re-parented and hangs around indefinitely. I was hoping to use
process groups to tackle this, but although setpgid() reports success,
it doesn't seem to have had any effect. Here is the code I am using:
myTask = [[NSTask alloc] init];
// ...snipped code for setting up path, args, pipes for
stdin/stdout/stderr, etc...
pid_t pgrp = setpgrp();
if (pgrp < 0)
{
NSLog(@"could not create new pgrp");
pgrp = getpgrp();
}
[myTask launch];
pid_t taskpid = [myTask processIdentifier];
int res = setpgid(taskpid, pgrp);
pid_t newpgrp = getpgid(taskpid);
NSLog(@"pgrp = %d, res = %d, newpgrd = %d", pgrp, res, newpgrp);
The call to setpgrp() is successful (the parent process has the same
pgid as its pid) and the NSLog reports "pgrp = 3166, res = 0, newpgrd
= 3166". However, "ps -xj" reports that the child process does not
have 3166 as its pgid (FWIW, it has pid/ppid/pgid 3167/3166/3167).
What am I missing here? Has anyone else had any success setting the
process group on a process spawned using NSTask?
Thanks,
Hamish
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