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I've written a shell script to soft-restart HAProxy (reverse proxy). Executing the script from the shell works. But I want a daemon to execute the script. That doesn't work. system() returns 256. I have no clue what that might mean.
#!/bin/sh # save previous state mv /home/haproxy/haproxy.cfg /home/haproxy/haproxy.cfg.old mv /var/run/haproxy.pid /var/run/haproxy.pid.old cp /tmp/haproxy.cfg.new /home/haproxy/haproxy.cfg kill -TTOU $(cat /var/run/haproxy.pid.old) if haproxy -p /var/run/haproxy.pid -f /home/haproxy/haproxy.cfg; then kill -USR1 $(cat /var/run/haproxy.pid.old) rm -f /var/run/haproxy.pid.old exit 1 else kill -TTIN $(cat /var/run/haproxy.pid.old) rm -f /var/run/haproxy.pid mv /var/run/haproxy.pid.old /var/run/haproxy.pid mv /home/haproxy/haproxy.cfg /home/haproxy/haproxy.cfg.err mv /home/haproxy/haproxy.cfg.old /home/haproxy/haproxy.cfg exit 0 fi HAProxy is executed with user haproxy. My daemon has it's own user too. Both run with sudo.
Any hints?
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The Exit code [256] is a general error and not an error displayed by PowerCenter. The failure occurs when shell script has $PMSourceFileDir t on UNIX, while there is no shortcut defined as an environment variable for the same.
return command is used to exit from a shell function. It takes a parameter [N], if N is mentioned then it returns [N] and if N is not mentioned then it returns the status of the last command executed within the function or script.
Every command returns an exit status (sometimes referred to as a return status or exit code). A successful command returns a 0, while an unsuccessful one returns a non-zero value that usually can be interpreted as an error code.
According to this and that, Perl's system() returns exit values multiplied by 256. So it's actually exiting with 1. It seems this happens in C too.
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Unless system returns -1 its return value is of the same format as the status value from the wait family of system calls (man 2 wait). There are macros to help you interpret this status:
man 3 wait Lists these macros and what they tell you.
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