segmentation fault for perl

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

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Re: segmentation fault for perl by ikegami (Patriarch) on Jul 03, 2009 at 15:52 UTC
The value returned by `system`/`$?` is from the OS. If the OS says the child segfaulted, there's not much Perl can do but to trust it. I find it very unlikely that the OS would say it segfaulted if it didn't. Update: Not on Windows, I suppose. Windows has larger exit codes that are squished into the unix format. Are you on Windows? Maybe there's a bug in the emulation.	[reply] [d/l] [select]
Re^2: segmentation fault for perl by Anonymous Monk on Jul 06, 2009 at 06:48 UTC
My os is solaris 10. Stating the problem again. I am invoking the script x.pl from y.pl as system(x.pl); my $exit_status = $? >> 8; I am capturing the status always. It sometimes happen that x.pl is able to execute successfuly (it updates a database before exiting). But capturing the error status in y.pl shows the system(x.pl) has a exit status of segmentation fault.	[reply]
Re^3: segmentation fault for perl by ikegami (Patriarch) on Jul 06, 2009 at 16:49 UTC
You can't find out if a segfault occured by looking at `$? >> 8`. Do you mean `$? & 127`? What's the value of `$?`? In any case, if a segfault did occur, I can't see how Perl was responsible.	[reply] [d/l] [select]
Re: segmentation fault for perl by rovf (Priest) on Jul 03, 2009 at 15:47 UTC
How do you call y.pl when you capture the error, as opposed to when not capturing the error? -- Ronald Fischer <ynnor@mm.st>	[reply] [d/l]
Re^2: segmentation fault for perl by Anonymous Monk on Jul 06, 2009 at 06:47 UTC
I am invoking the script x.pl from y.pl as system(x.pl); my $exit_status = $? >> 8; I am capturing the status always. It sometimes happen that x.pl is able to execute successfuly (it updates a database before exiting). But capturing the error status in y.pl shows the system(x.pl) has a exit status of segmentation fault. My os is solaris 10	[reply]
Re^3: segmentation fault for perl by rovf (Priest) on Jul 07, 2009 at 09:23 UTC
I am invoking the script x.pl from y.pl as system(x.pl); I take it to mean `system('x.pl');`. And I guess you made sure that x.pl has a correct #! line? `my $exit_status = $? >> 8;` I am capturing the status always. How do you know that your program died by segmentation fault? `$? >> 8` is whatever x.pl passes to its `exit` call, so from this value alone, you can not deduce that your program segfaulted. But if it does, it could be that either the Perl used has a problem (that's why I'm asking you about the #! line), or (more likely) that x.pl uses some Perl module which contains compiled parts, so this would be the place to look. -- Ronald Fischer <ynnor@mm.st>	[reply] [d/l] [select]