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Date: Sun, 30 Oct 2005 20:10:17 +0200 (EET)
From: micheel drippee <micheel_d23@yahoo.com.tr>
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Subject: signal handling in child process.
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hello,

i have a daemon program and installed a
signal_handler() function for it. from signal_handler:

case SIGCHLD:
  if ((wait(&status)) == -1) return;  
  if (WIFSIGNALED(status)) return;
  if (WIFSTOPPED(status)) return;
  if (WIFEXITED(status)) return; 
  break;

in child process i am doing a fork() and then execve.

switch((pid = vfork())) {
case -1:
  error...
case 0:
  execve();
default:
  if (wait(&stat) == -1) {
    syslog(LOG_ERR, "wait: %s", strerror(errno));
    return -1;
  }
}

The problem is that: when the executing program is
exited wait() returns error. 'No child processes'

I determined that, my signal handler catchs SIGCHLD
when the process finish. And then waits it. So the
child process cannot wait its own child.

How can i solve this problem? I found a solution but i
am not sure if it is best way.

I ignore SIGCHLD in child before execve.

signal(SIGCHLD, SIG_IGN);

What is your comments.

thank you..

-mch


		
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