Perl Error 256
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Tutorials Poetry RecentThreads NewestNodes Donate What'sNew on May 19, 2001 at 01:33UTC ( #81640=perlquestion: print w/replies, xml ) Need Help?? Ras has asked for the wisdom of the Perl Monks concerning the following question: Does any body exit code 256 in unix knows what happens when you do a system call and it returns
Exit Code 256 Informatica
256? Do you know what 256 means? Thanks in advance Edited 2001-05-18 by Ovid Comment on System Return c++ system return code 256 Code (was: 256) Replies are listed 'Best First'. Re: System Return Code (was: 256) by kschwab (Priest) on May 19, 2001 at 17:26UTC The perl docs actually do have perl return code 2 a good explanation of what the return value from system() is, but it's in "perldoc perlvar" instead of "perldoc -f system". system() returns the value of $? after the wait() is done. Here it is: $? The status returned by the last pipe close, backtick (``) command, or system() operator. Note that this is the status word returned by the
Perl System Return Code
wait() system call (or else is made up to look like it). Thus, the exit value of the subprocess is actually ($? >> 8), and $? & 127 gives which signal, if any, the process died from, and $? & 128 reports whether there was a core dump. (Mnemonic: similar to sh and ksh.) Just to clarify, $? >> 8 is bitshifting by 8, which is essentially dividing by 256. So, if you are getting a return val of 256 from system(), your spawned program did an exit(1).[reply][d/l] Re: 256 by no_slogan (Deacon) on May 19, 2001 at 01:40UTC You mean... $result = system("foo") sets $result to 256? It means "foo" returned 1. Read "man foo" to see what that means - probably something went wrong. Or not. I need more information to be helpful.[reply][d/l] Re: 256 by Beatnik (Parson) on May 19, 2001 at 01:38UTC AFAIK it's application dependent. system() returns the application status/exit code, so whatever the application passes along as exit code is catcheable in your perl code.256 could be anything really :) Greetz Beatni
Fix support for textcomp package Next message (by thread): [tex4ht] erorr code 256, possible perl error code, come up wexitstatus with using --lua option with make4ht, error --- Improper dvi file perl system call Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Hello; I
Linux Exit Code
mentioned this in tex chat room. I found a work around. But may be I should send it here also, just in case someone gets this error in the http://www.perlmonks.org/?node_id=81640 future or may be seen this before. I am not able to make a MWE since I do not even know where to start, since the error is just error code 256. I put one zip file with folder that have the one large latex file and everything else in it (all images, .mk4, and .cfg file). It http://tug.org/pipermail/tex4ht/2015q4/001301.html is 75 MB. (link at the bottom) To see the error, Please extract the zip file and go to the folder that gets created, (it will be called error_make4ht_lua/ then type the command: make4ht -u --lua -c ./nma.cfg -e ./main.mk4 KERNEL.tex "htm,3,pic-align,notoc*" -d KERNEL After a while (few minutes, as it is large), the error I get is ---------------------- (./KERNEL.4ct) [392] [393] [394] [395] [396] [397] [398] [399] [400] [401] [402] (./KERNEL.aux) LaTeX Font Warning: Some font shapes were not available, defaults substituted. LaTeX Warning: Label(s) may have changed. Rerun to get cross-references right. ) (see the transcript file for additional information) 9393 words of node memory still in use: 6 hlist, 2 vlist, 2 rule, 2 glue, 1 kern, 20 sub_mlist, 948 glyph, 82 glue_sp ec, 1 write nodes avail lists: 1:3,2:44,3:9651,4:3646,5:5534,6:9308,7:9005,8:2,9:8913,10:2634 Output written on KERNEL.dvi (402 pages, 4467600 bytes). Transcript written on KERNEL.log. Make4ht: tex4ht -cunihtf -utf8 KERNEL ---------------------------- tex4ht.c (2012-07-25-19:36 kpathsea) tex4ht -cunihtf -utf8 KERNEL (/usr/local/texlive/2015/texmf-dist/tex4ht/base/unix/tex4ht.env) --- error --- Improper dvi file Make4ht: Fatal error. Command tex4ht returned
New? Today's Posts FAQ Rules Guidelines Search Advanced Search Forum :: Server side development Perl/ CGI system() function returning a value 256 ? If this is your first visit, be sure to check out the FAQ by clicking the link above. You http://www.codingforums.com/perl-cgi/95555-system-function-returning-value-256-a.html may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Enjoy an ad free experience by logging in. Not a member yet? Register. Page 1 of 2 12 Last Jump to page: Results 1 to 15 of 16 Thread: system() function returning a value 256 ? Thread Tools Show Printable Version Email this Page… Subscribe to this code 2 Thread… Rate This Thread Current Rating Excellent Good Average Bad Terrible 09-08-2006,06:39 AM #1 ganesh_mak View Profile View Forum Posts Regular Coder Join Date Sep 2005 Posts 113 Thanks 0 Thanked 0 Times in 0 Posts system() function returning a value 256 ? Hi, i have test.cgi file in cgi-bin directory . test.cgi Code: #! /usr/bin/perl use CGI; print start_html(); system('sudo ls'); print end_html; even i have added the apache user with certain permission to execute the ls command exit code 256 in /etc/sudoers file. when i run it through command line its working perfectly fine.but when i run it through web browser i am getting no o/p as system() is returnning a value of 256. i am using apache on fedora core -3 can anybody help me out in solving this ? thanks Reply With Quote 09-08-2006,06:56 AM #2 FishMonger View Profile View Forum Posts Super Moderator Join Date May 2005 Location Southern tip of Silicon Valley Posts 3,329 Thanks 2 Thanked 232 Times in 225 Posts Why are you using sudo? The ls command doesn't require sudo access. i am getting no o/p as system() is returnning a value of 256 That's because a system call returns the return code of the command you execute. If you want the output of the command use backticks. Code: #!/usr/bin/perl use CGI qw(:standard); print header(), start_html(); print `ls`; print end_html(); Reply With Quote 09-08-2006,07:45 AM #3 ganesh_mak View Profile View Forum Posts Regular Coder Join Date Sep 2005 Posts 113 Thanks 0 Thanked 0 Times in 0 Posts using the backticks also i am not getting the output on the web browser.its blank. and if need to call an c executable which has got root as owner through the cgi . should i have to use system() and sudo . or is there any other way ? thanks Reply With Quote 09-08-2006,10:03 AM #4 ganesh_mak View Prof