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. ] -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
