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Full Discussion: Background processes return 127 sporadically
Top Forums Shell Programming and Scripting Background processes return 127 sporadically Post 36181 by max_largo on Thursday 22nd of May 2003 12:57:19 PM
Old 05-22-2003
Data Background processes return 127 sporadically
I have created a shell script that spawns multiple background processes (spawns sqlplus application). I use an array to capture the process id of those background processes. I then loop through the array and issue a 'wait' command to wait on the process id that was captured in the array. I am getting sporadic results where some of the background processes return an exit code of 127.

It seems possible that it may be related to the OS because I get different results on different machines. Sun OS 5.6 I get sporadic results. Sun OS 5.8 seems to be OK.

Output results to show inconsitency:
--Run 1
Process: 0 PID: 13718 Return Value of: 0
Process: 1 PID: 13721 Return Value of: 0
Process: 2 PID: 13724 Return Value of: 0
Process: 3 PID: 13727 Return Value of: 127
Process: 4 PID: 13730 Return Value of: 0
--Run 1
Process: 0 PID: 20849 Return Value of: 0
Process: 1 PID: 20852 Return Value of: 127
Process: 2 PID: 20855 Return Value of: 127
Process: 3 PID: 20858 Return Value of: 127
Process: 4 PID: 20861 Return Value of: 0
--Run 1
Process: 0 PID: 21688 Return Value of: 0
Process: 1 PID: 21691 Return Value of: 0
Process: 2 PID: 21694 Return Value of: 127
Process: 3 PID: 21697 Return Value of: 0
Process: 4 PID: 21700 Return Value of: 0
--Run 1
Process: 0 PID: 23945 Return Value of: 0
Process: 1 PID: 23948 Return Value of: 0
Process: 2 PID: 23951 Return Value of: 0
Process: 3 PID: 23954 Return Value of: 0
Process: 4 PID: 23957 Return Value of: 0

Any ideas?????
 

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LEARN ABOUT MINIX

ps

PS(1)							      General Commands Manual							     PS(1)

NAME

       ps - process status

SYNOPSIS

       ps [-alxU] [kernel mm fs]

OPTIONS

       -a     Print all processes with controlling terminals

       -l     Give long listing

       -x     Include processes without a terminal

EXAMPLES

       ps -axl		   # Print all processes and tasks in long format

DESCRIPTION

       Ps  prints the status of active processes.  Normally only the caller's own processes are listed in short format (the PID, TTY, TIME and CMD
       fields as explained below).  The long listing contains:

	 F  Kernel flags:	    001: free slot	     002: no memory map 	  004: sending; 	   010:  receiving	      020:
       inform on pending signals	   040: pending signals 	  100: being traced.

	 S	 State: 	   R: runnable		 W: waiting (on a message)	     S: sleeping (i.e.,suspended on MM or FS)		Z:
       zombie		T: stopped

	 UID, PID, PPID, PGRP	   The user, process, parent process and process group ID's.

	 SZ	 Size of the process in kilobytes.

	 RECV	   Process/task on which a receiving process is waiting or sleeping.

	 TTY	       Controlling tty for the process.

	 TIME	   Process' cumulative (user + system) execution time.

	 CMD	 Command line arguments of the process.

       The files /dev/{mem,kmem} are used to read the system tables and command line arguments from.  Terminal names in /dev are used to  generate
       the mnemonic names in the TTY column, so ps is independent of terminal naming conventions.

																	     PS(1)
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