Re: the best form to wait the finish of execution of a child...
From: Florent Thoumie (flz_at_xbsd.org)
Date: 03/30/05
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To: "Michael C. Shultz" <ringworm01@gmail.com> Date: Wed, 30 Mar 2005 20:42:23 +0200
Le Mercredi 30 mars 2005 à 10:25 -0800, Michael C. Shultz a écrit :
> On Wednesday 30 March 2005 10:17 am, zean zean wrote:
> > Hi Hackers:
> >
> > Excuse for my badly English. which is the best form to wait the
> > finish of execution of a child.
> >
> > My idea is:
> >
> > pid_t chilpid;
> >
> > while(childpid != wait(&status))
> > ;
> >
> > Any aid to obtain the best way is very welcome.
> >
> > PD. Excuse my ignorance and I hope they can guide me.
> >
> > Bye and thanxs ;)
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>
> Here is how I do it, likely someone will have a better way:
>
> pid_t pid;
>
> pid = fork();
> if( !pid )
> {
> execl( "/bin/mkdir", "mkdir", "directory_name", 0 );
> }
> wait( (int*)pid );
Something like this would be better I think :
pid_t pid;
int ret;
pid = fork();
if (pid < 0)
{
perror("fork");
/* exit(1); if you want */
}
else if (pid == 0)
{
if (execl("/bin/mkdir", "mkdir", "directory_name", 0 ))
perror("execl");
}
else
{
wait(&ret); /* plus return code handling, YMMV */
}
You need to check fork(2) return code or your wait(2) is useless.
Don't mix pid_t with int just for the gain of one variable.
I haven't played with this for some time, I guess it's correct.
-- Florent Thoumie flz@xbsd.org
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