Very Computer

You see my problem is not simple at all.

Roland

Cheers

Mark  
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I have a daemon that acts as a server for incoming socket connections. The
parent process forks and waits with accept for a process to connect to the
parent socket. The child process performs the asked job and terminates
with an exit(0). This is the normal way it should be done.

But the child processes do not really quit, they become zombies <defunct>
and they disapear only if I kill the parent process.

What can I do to kill the child processes ???

Can someone help me?

Thanks in advance.

        if (fork()==0) {
                if (fork()==0) {
                        /* all of the sub-program stuff */
                }
                exit(0);
        }
        wait(&status);
        return;

Quote:}

Your milage may vary

Jeff
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  v   first superhero  \ SM / | "This time it will | Curiosity has it own
"more than a cute .sig" \__/  | surely run" - anon | reason for existing."

    Roland> But the child processes do not really quit, they become
    Roland> zombies <defunct> and they disapear only if I kill the
    Roland> parent process.

You need to catch SIGCHLD and wait() for the child.  Richard Stevens
has a very good example of a "child reaper" in his "Advanced Programming
in the UNIX Environment" book.

Kevin

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?I forgot to mention that I can not use the normal wait(0) method in a
?signal handler which is activated on the signal of the child because in
?this case the parent process which waits in in the accept routine will be
                                             ^^^^^^^^^^^^^
?interrupted and can not wait anymore for sockets to connect.

?You see my problem is not simple at all.

I suppose that you mean: "in the listen routine"

You of course do something like that:

  do {
        newfd = listen(fd);
        if (-1 == newfd) {
                int err = errno;
                if (EINTR == err) {
                        /* To do tasks what don't have possible to do
                         * in signal handlers:
                         */
                        do_possible_bookkeeping();      
                } else {
                        perror("listen:");
                        break; /* break retry loop */
                }
        }
  } while (-1 == newfd);