Waitpid equivalent with timeout?

Question

Imagine I have a process that starts several child processes. The parent needs to know when a child exits.

I can use waitpid, but then if/when the paren

Answer 1

I thought that select will return EINTR when SIGCHLD signaled by on of the child. I belive this should work:

while(1)
{
  int retval = select(0, NULL, NULL, NULL, &tv, &mask);
  if (retval == -1 && errno == EINTR) // some signal
  { 
      pid_t pid = (waitpid(-1, &st, WNOHANG) == 0);
      if (pid != 0) // some child signaled
  }
  else if (retval == 0)
  {
      // timeout
      break;
  }
  else // error
}

Note: you can use pselect to override current sigmask and avoid interrupts from unneeded signals.