the best form to wait the finish of execution of a child...

[Florent Thoumie]

Le Mercredi 30 mars 2005 à 14:17 -0400, zean zean a écrit :

> Hi Hackers:
> 
> Excuse for my badly English.  which is the best form to wait  the
> finish of execution of a child.

	It depends on the context of your program 
	(synchronous/asynchronous).

> My idea is:
> 
> pid_t chilpid;
> 
> while(childpid != wait(&status))
> ;

	That's a possibility, you can catch SIGCHLD with a signal 
	handler (see signal(3), sigprocmask(2), sigaction(2)) which 
	would set a global flag, and then use a non-blocking waitpid(2) 
	or wait4(2) instead.

	Note: What you suggested isn't really safe. You shouldn't 
	ignore wait(2) return status (could be -1 because something
	unexpected happened, see ERRORS section from the manpage).

-- 
Florent Thoumie
flz at xbsd.org


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