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Full Discussion: Shell script runs fine in Solaris, in Linux hangs at wait command
Top Forums Shell Programming and Scripting Shell script runs fine in Solaris, in Linux hangs at wait command Post 302466867 by aksaravanan on Wednesday 27th of October 2010 02:34:43 PM
Old 10-27-2010
Shell script runs fine in Solaris, in Linux hangs at wait command
HI,

I have a strange problem. A shell script that runs fine on solaris. when i ported to linux, it started hanging.

here is the core of the script
Code:
CFG_FILE=tab25.cfg
sort -t "!" -k 2 ${CFG_FILE} | egrep -v "^#|^$" |  while IFS="!" read  a b c
do
#echo "jobs output"
#jobs
#echo "jobs -p  "
#jobs -p
# echo "Before entering parallel process  $$ "
#                jobs  -l
#if [[ `jobs | wc -l` -ne 0 ]] ; then
#               jobs|wc -l
#                ps -ef|grep "`jobs -p`"
#fi
 
wait
done

my CFG_FILE is
Code:
this_is_a_test_ttt! lask;djfl;a ljkasfl; as l;jsladfjasldfj aslk;fjas flj;asf fABCDEFGHIJ KLMNOP ABCDELKJ :LKJSDFLKJSDFKLJDFKDJF  DFKSDHFIUI JSF SIDFJISDFISJDIF  ! lkjasdflkjasf

repeated for 32 times.


if i uncomment the body of while loop , here is the output (that shows what for "wait" is waiting)
Code:
[2] +  Running                 <command unknown>
[1] -  Running                 <command unknown>
jobs -p  
28418

Before entering parallel process 28416
Code:
[2] + 28418      Running                 <command unknown>
       1 
myid   28418 28416  0 14:26 pts/31   00:00:00 egrep -v ^#|^$
myid   28421 28416  0 14:26 pts/31   00:00:00 ps -ef
myid   28422 28416  0 14:26 pts/31   00:00:00 grep 28421?28418

what causes this script wait for a while/grep command in linux whereas in solaris it is fine.

To give further details, i suppose to call a (8) background process, for each of line read from the file. So i introduced a wait command and when all complete i read next line and so on.
Since wait was really waiting for grep and not for spawned child, my script broke.

Othercases when it can run fine in linux

1. fewer lines in config file
2. in one test, i shrink one of row length from 260 to 250, it worked.

i can't predict a consitance condition for this behaviour.

Any help is appreciated in fixing / explaining this behaviour.

thanks
AK
Last edited by Scott; 10-27-2010 at 04:22 PM.. Reason: Please use code tags
 

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LEARN ABOUT DEBIAN

safe_asterisk

SAFE_ASTERISK(8)					     Linux Programmer's Manual						  SAFE_ASTERISK(8)

NAME

       safe_asterisk -- A wrapper to run the asterisk executable in a loop

SYNOPSIS

       safe_asterisk [ asterisk_params ]

DESCRIPTION

       safe_asterisk is a script that runs asterisk in a loop, which can be useful if you fear asterisk may crash.

       The  script  does  not run in the background like a standard service. Rather, it runs in its own linux virtual console (9, by default).	It
       also uses the option '-c' of asterisk(8) to avoid detaching asterisk from that terminal.

       safe_asterisk also runs asterisk with unlimited core file size, and thus asterisk will dump core in case of a crash.

       To get a "picture" of console 9, from another terminal (e.g: from a remote shell session) you can use:

	 screendump 9

       The init script of the Debian package should be able to run safe_asterisk as the  asterisk  service,  if  so  configured.  See  coments	in
       /etc/default/asterisk

FILES

       /tmp
	      safe_asterisk runs in that directory, rather than in / as usual.

       /tmp/core
	      If core files were generated there, they may be

       /etc/asterisk/startup.d
	      Files  in  this directory will be 'source'd by the safe_asterisk script before it starts Asterisk proper, allowing them to set addi-
	      tional environment variables or run any other steps that are needed for your system.

BUGS

       While showing the output on a console is useful, using screen(1) as the terminal may be better.

       The script does not read configuration from standard location under /etc

       It uses fixed locations under /tmp , and thus may be exposed to a symlink attacks.

SEE ALSO

       asterisk(8), screendump(9)

AUTHOR

       This manual page was written by Tzafrir Cohen <tzafrir.cohen@xorcom.com> Permission is granted to copy, distribute and/or modify this docu-
       ment under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2.

Asterisk							  Jun 30th, 2005						  SAFE_ASTERISK(8)
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