Chas, thanks a lot for your example.
if the while loop is inside a main infinite loop (as if it was a
daemon), do I still need to have the waitpid function? and if yes, where
should be located?
Once again, thanks a lot!
Chas Owens wrote:
> On Tue, 2002-03-26 at 01:14, Ahmed Moustafa wrote:
> Fork returns 0 to the child process and the pid of the child process to
> the parent. This allows you to say things like
>
> my @children;
> #loop while get_filename retruns a vaild filename
> #this could easily be a foreach loop of @filenames
> while (my $filename = get_filename()) {
> my $forked = fork; #fork into two processes(parent and child)
>
> #if $forked is undef then fork failed
> unless (defined $forked) {
> warn "something went wrong with fork";
> next;
> }
>
> #push the PID of the child onto a stack
> push @children, $forked; #meaningless for child
>
> next if $forked; #parent loops
>
> #only the child can get here
> encrypt_the_file($filename);
>
> #child ends execution here
> exit 0;
> }
>
> #reap the children to avoid zombies
> waitpid $_ for (@children);
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