Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

Re^2: "use strict" sets $!

by superfrink (Curate)
on Aug 19, 2009 at 22:30 UTC ( #789959=note: print w/ replies, xml ) Need Help??


in reply to Re: "use strict" sets $!
in thread "use strict" sets $!

I ran a couple strace commands:

strace -o strace.out -ff perl -lwe 'use strict; print qq($!)' strace -o strace.out.2 -ff perl -lwe 'print qq($!)'
I ran grep ' E' on each output file to check for system calls that returned an error. (This may not find all errors.) Here is the diff. The lines starting with < are in the strace from running with use strict;.
[chad@chad-laptop ~/x]$ diff 1 2 21,53c21,27 < stat64("/usr/local/lib/site_perl/5.10.0/i486-linux-gnu-thread-multi" +, 0xbfe70cf0) = -1 ENOENT (No such file or directory) < stat64("/usr/local/lib/site_perl/5.10.0", 0xbfe70cf0) = -1 ENOENT (N +o such file or directory) < stat64("/usr/local/lib/site_perl/i486-linux-gnu-thread-multi", 0xbfe +70cf0) = -1 ENOENT (No such file or directory) < _llseek(0, 0, 0xbfe70b60, SEEK_CUR) = -1 ESPIPE (Illegal seek) < _llseek(1, 0, 0xbfe70b60, SEEK_CUR) = -1 ESPIPE (Illegal seek) < _llseek(2, 0, 0xbfe70b60, SEEK_CUR) = -1 ESPIPE (Illegal seek) < ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfe70be8) = -1 ENOTTY (Ina +ppropriate ioctl for device) < stat64("/etc/perl/strict.pmc", 0xbfe7090c) = -1 ENOENT (No such file + or directory) < stat64("/etc/perl/strict.pm", 0xbfe70884) = -1 ENOENT (No such file +or directory) < stat64("/usr/local/lib/perl/5.10.0/strict.pmc", 0xbfe7090c) = -1 ENO +ENT (No such file or directory) < stat64("/usr/local/lib/perl/5.10.0/strict.pm", 0xbfe70884) = -1 ENOE +NT (No such file or directory) < stat64("/usr/local/share/perl/5.10.0/strict.pmc", 0xbfe7090c) = -1 E +NOENT (No such file or directory) < stat64("/usr/local/share/perl/5.10.0/strict.pm", 0xbfe70884) = -1 EN +OENT (No such file or directory) < stat64("/usr/lib/perl5/strict.pmc", 0xbfe7090c) = -1 ENOENT (No such + file or directory) < stat64("/usr/lib/perl5/strict.pm", 0xbfe70884) = -1 ENOENT (No such +file or directory) < stat64("/usr/share/perl5/strict.pmc", 0xbfe7090c) = -1 ENOENT (No su +ch file or directory) < stat64("/usr/share/perl5/strict.pm", 0xbfe70884) = -1 ENOENT (No suc +h file or directory) < stat64("/usr/lib/perl/5.10/strict.pmc", 0xbfe7090c) = -1 ENOENT (No +such file or directory) < stat64("/usr/lib/perl/5.10/strict.pm", 0xbfe70884) = -1 ENOENT (No s +uch file or directory) < stat64("/usr/share/perl/5.10/strict.pmc", 0xbfe7090c) = -1 ENOENT (N +o such file or directory) < ioctl(4, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfe70698) = -1 ENOTTY (Ina +ppropriate ioctl for device) < open("/usr/share/locale/en_CA.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) += -1 ENOENT (No such file or directory) < open("/usr/share/locale/en_CA.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = + -1 ENOENT (No such file or directory) < open("/usr/share/locale/en_CA/LC_MESSAGES/libc.mo", O_RDONLY) = -1 E +NOENT (No such file or directory) < open("/usr/share/locale/en.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = - +1 ENOENT (No such file or directory) < open("/usr/share/locale/en.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 + ENOENT (No such file or directory) < open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOE +NT (No such file or directory) < open("/usr/share/locale-langpack/en_CA.UTF-8/LC_MESSAGES/libc.mo", O +_RDONLY) = -1 ENOENT (No such file or directory) < open("/usr/share/locale-langpack/en_CA.utf8/LC_MESSAGES/libc.mo", O_ +RDONLY) = -1 ENOENT (No such file or directory) < open("/usr/share/locale-langpack/en_CA/LC_MESSAGES/libc.mo", O_RDONL +Y) = -1 ENOENT (No such file or directory) < open("/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/libc.mo", O_RD +ONLY) = -1 ENOENT (No such file or directory) < open("/usr/share/locale-langpack/en.utf8/LC_MESSAGES/libc.mo", O_RDO +NLY) = -1 ENOENT (No such file or directory) < open("/usr/share/locale-langpack/en/LC_MESSAGES/libc.mo", O_RDONLY) += -1 ENOENT (No such file or directory) --- > stat64("/usr/local/lib/site_perl/5.10.0/i486-linux-gnu-thread-multi" +, 0xbfb1b1a0) = -1 ENOENT (No such file or directory) > stat64("/usr/local/lib/site_perl/5.10.0", 0xbfb1b1a0) = -1 ENOENT (N +o such file or directory) > stat64("/usr/local/lib/site_perl/i486-linux-gnu-thread-multi", 0xbfb +1b1a0) = -1 ENOENT (No such file or directory) > _llseek(0, 0, 0xbfb1b010, SEEK_CUR) = -1 ESPIPE (Illegal seek) > _llseek(1, 0, 0xbfb1b010, SEEK_CUR) = -1 ESPIPE (Illegal seek) > _llseek(2, 0, 0xbfb1b010, SEEK_CUR) = -1 ESPIPE (Illegal seek) > ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfb1b098) = -1 ENOTTY (Ina +ppropriate ioctl for device)
Maybe the difference is related to the language settings or the ioctl on file descriptor 4. The strace output shows:
open("/usr/share/perl/5.10/strict.pm", O_RDONLY|O_LARGEFILE) = 4 ioctl(4, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfe70698) = -1 ENOTTY (Inapp +ropriate ioctl for device) _llseek(4, 0, [0], SEEK_CUR) = 0
Update: I'm running perl 5.10.0 on Ubuntu 9.04.


Comment on Re^2: "use strict" sets $!
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://789959]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others browsing the Monastery: (12)
As of 2015-07-08 08:36 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (98 votes), past polls