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SubjectRe: disowning a process
From
Date
On Fri, 2005-05-27 at 12:30 -0500, Davy Durham wrote:
> Hi, I'm not sure if there's a posix way of doing this, but wanted to
> check if there is a way in linux.
>
> I want to have a daemon that fork/execs a new process, but don't want
> (for various reasons) the responsibility for cleaning up those process
> with the wait() function family. I'm assuming that if the init process
> became the parent of one of these forked processes, then it would clean
> them up for me (is this assumption true?). Besides the daemon process
> exiting, is there a way to disown the process on purpose so that init
> inherits it?

Try man daemon.

The way I use to do it was simply do a double fork. That is
(simplified)...

if ((pid = fork()) < 0) {
perror("fork");
} else if (!pid) {
/* child */
if ((pid = fork()) < 0) {
perror("child fork");
exit(-1);
} if (pid) {
/* child parent */
/* Here we detach from the child */
exit(0);
}
/* Now this code is a child running almost as a daemon
with init as the parent. */
setsid();
/* Now the child is completely detached from the original
parent */
/* ... daemon code here ... */
exit(0);
}

/* parent code here */

-- Steve


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