topic Re: How to know the Exit status of a executable in HP Unix through PERL in Operating System - Linux

How to know the Exit status of a executable in HP Unix through PERL

CA1490051 — Wed, 20 Feb 2008 13:01:02 GMT

Hi All,

Can any one please help me to solve the below problem.

I have a perl script. In the Perl script i am executing a "a.out" file using the system("./a.out").

But, I want to check whether the a.out terminated normally without causing any "Bus Error" or "Segmentation Fault".

CAn i do this using "$?". If yes what will be the exit status for normal execution. And does this exit status differ for different flavours of UNIX like Linux and SunOs.

thanks in advance
regards
Vikram

Re: How to know the Exit status of a executable in HP Unix through PERL

James R. Ferguson — Wed, 20 Feb 2008 14:08:39 GMT

Hi Vikram:

To obtain the exit value you need to examine the high eight bits of the value returned:

Hence:

# perl -le '$rc=system("/usr/bin/cp");print "exit status = ",$rc>>8'

1

...looks just like you did:

# /usr/bin/cp; echo $?
1

Regards!

...JRF...

Re: How to know the Exit status of a executable in HP Unix through PERL

Ralph Grothe — Wed, 20 Feb 2008 16:30:04 GMT

The explanation can be found in either

perldoc -f system

or

perldoc perlvar

if you look for $?

Re: How to know the Exit status of a executable in HP Unix through PERL

Ralph Grothe — Wed, 20 Feb 2008 16:41:23 GMT

The explanation can be found in either

perldoc -f system

or

perldoc perlvar

if you look for $?

Except for SIGKILL and SIGSTOP you can implement a signal handler by assigning the special Perl hash %SIG a code ref to the appropriate key which is the respective signal name without the prefix SIG.
Details to %SIG may also be found in perldoc perlvar.

Re: How to know the Exit status of a executable in HP Unix through PERL

Ralph Grothe — Wed, 20 Feb 2008 16:43:51 GMT

Webmasters, please remove my first reply.
This only happens because there are minutes between clicking submit and waiting for the server confirmational response.

Re: How to know the Exit status of a executable in HP Unix through PERL

Steven Schweda — Wed, 20 Feb 2008 18:51:19 GMT

> This only happens because there are minutes
> between clicking submit and waiting for the
> server confirmational response.

So, don't wait for that. Wait a few seconds,
then re-view the topic. (I open a new window
for the Reply, so it's easy to reload the
original thread's window after Submitting the
reply.)

And when Submit from Preview fails for no
good reason, just back up to the pre-Preview
page, and try Submit from there.

And when it gets all confused by switching
between forums11.itrc.hp.com and
forums12.itrc.hp.com, try editing the URL to
say forums.itrc.hp.com.

And so on ...

The Forum software appears to be garbage, but
figuring out how to work around its many
problems can be viewed as an entertaining
game (if you're easily entertained).