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Full Discussion: Pid file and process check
Top Forums UNIX for Beginners Questions & Answers Pid file and process check Post 303036937 by MadeInGermany on Thursday 18th of July 2019 03:14:32 AM
Old 07-18-2019
/var/run/ is supposed to be writable and volatile: to be cleaned during system boot, or an in-memory file system (e.g. tmpfs).
The daemon process should create the pidfile, and remove it when it is killed, in an exit handler that captures all kill signals. (Please do not kill -9 the daemon process!)
Further, an init script can check for an existing pidfile, if yes then check for validity and refuse to start a second daemon process. If the daemon-process runs as non-root, the init script creates a subdirectory and chowns it to the daemon user.

AIX generates random and big (7 or 8 digits) pids.
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lsmsad(8)						      System Manager's Manual							 lsmsad(8)

NAME
lsmsad - Starts the Storage Administrator (SA) daemon SYNOPSIS
/usr/sbin/lsmsad DESCRIPTION
The SA daemon, lsmsad, is a process required by lsmsa, the SA graphical user interface (GUI). The daemon issues commands and obtains system information on behalf of SA. The SA daemon runs on a Tru64 UNIX system on which LSM is initialized and running. The SA client runs on any machine that supports the Java Runtime Environment. The SA daemon is automatically started at boot time. Under normal conditions, the daemon does not need to be run manually. If SA does not start during the boot process, enter: /sbin/init.d/lsmsa stop To restart SA, enter: /sbin/init.d/lsmsa start Only one SA daemon can be running on a system at a given time. If a second SA daemon attempts to start, it will fail. RESTRICTIONS
You must be root user to run lsmsad. FILES
The script that starts lsmsad at boot time. The command log file that tracks SA tasks. The access log file that tracks login to SA. The server log file that tracks server startup information and server errors. The log maintenance shell script that saves and compresses log files. SEE ALSO
lsmsa(8), volintro(8) lsmsad(8)
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