Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

Re: No child processes

by slife (Scribe)
on Sep 13, 2002 at 13:22 UTC ( #197563=note: print w/replies, xml ) Need Help??


in reply to No child processes

If you are really determined that you don't want to un-set your CHLD signal handler, you need to bear in mind two things:

i) your 'standard' handler is throwing away the child pid and return code values and
ii) system() is, in effect, shorthand for the traditional UNIX fork/exec/wait idiom.

You may, therefore, want to set the signal handler to do something useful like:
my %pid; $SIG{CHLD} = sub { while((my $kid = waitpid(-1,WNOHANG))>0 ) { warn "PID $kid returned $?"; } };

(this is based Lincoln Stein's 'Network Programming with Perl' p305).
.....

and replace $res = system @args;
with exec @args;

Though, you will need to consider the usual caveats regarding signal handlers in perls prior to 5.8.0 ...

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://197563]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (3)
As of 2021-09-18 12:50 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?