Here is my code snippet that is driving me crazy:
////
#!/usr/local/bin/perl
printf "Hello World\n";
printf "ERRNO: %d\n", $!;
# use lib "$ENV{RTM_HOME}/rtm/src/vtm";
# printf "ERRNO: %d\n", $!;
////
$ t
Hello World
ERRNO: 0
////
#!/usr/local/bin/perl
printf "Hello World\n";
printf "ERRNO: %d\n", $!;
use lib "$ENV{RTM_HOME}/rtm/src/vtm";
printf "ERRNO: %d\n", $!;
////
$ t
Hello World
ERRNO: 2
ERRNO: 2
$ENV{RTM_HOME}/rtm/src/vtm is a good path, why would ERRNO get set to 2
BEFORE and after the 'use lib' call?
Thanks again,
Jason
-----Original Message-----
From: Jeff 'japhy' Pinyan [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 07, 2003 1:58 PM
To: Allison, Jason (JALLISON)
Cc: '[EMAIL PROTECTED]'
Subject: Re: ERRNO ... What am I missing
On Aug 7, Allison, Jason (JALLISON) said:
>Can someone explain the interaction of POSIX ERRNO and PERL scripts?
>When does ERRNO get set and is it set with each PERL call? I cant seem
>to track when '$!' is set. Sometimes it will be set to 0, and others
>2. I am having difficultly nailing its behavior down.
>
>If there is good reading I am missing, please let me know.
$! is set whenever there is an error from the system, more or less. This
can happen after a failed chmod() or mkdir() or open() or unlink() call. $!
will only have a meaningful value when there's a failure, which is why you
should only check it if the function being used returns false:
chmod(...) or warn "chmod error: $!";
open(...) or warn "can't open xxx: $!";
unlink(...) or warn "can't unlink xxx: $!";
$! is also magical. It can be used as a number AND as a string.
--
Jeff "japhy" Pinyan [EMAIL PROTECTED] http://www.pobox.com/~japhy/
RPI Acacia brother #734 http://www.perlmonks.org/ http://www.cpan.org/
<stu> what does y/// stand for? <tenderpuss> why, yansliterate of course. [
I'm looking for programming work. If you like my work, let me know. ]
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