BSYSTEM/B call on windows misbehaves

Cheburashka has asked for the wisdom of the Perl Monks concerning the following question:


...
if(!system("$program>$seq_file")) { 
      //error
 }
...
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I recently had to port some perl script to a unix machine and it calls an executable at some point via a C program. It works, but... SYSTEM does not return 0 as it's supposed to when execution is successful. I don't know why. Some things I thought about: a) Maybe I need to flush befare calling system? I used the line I got from perl.com documentation:

select((select(STDIN), $| = 1) [ 0 ]);
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but it didn't help. b) Another thing I thought...was maybe there is a timeout for the SYSTEM cal I am not aware of? The program takes about .5 seconds to execute. I could use any help or suggestions. Thanx fuzzy animals unite!!! Cheb

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Re: SYSTEM call on windows misbehaves by Ido (Hermit) on Feb 26, 2002 at 18:50 UTC
System, as you said, returns 0 when execution is successful. Therefore the lines: `if(!system("$program>$seq_file")) { # not //;) error }` [download] Aren't correct. Because When the return of system is false, as you check in the condition, there's no error. I think you should drop the !..	[reply] [d/l]
Re: Re: SYSTEM call on windows misbehaves by Cheburashka (Acolyte) on Mar 01, 2002 at 22:51 UTC
by god you are right...that's what I get for using other people's scripts...thanks a lot.	[reply]