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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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LEARN ABOUT CENTOS

card_eventmgr

card_eventmgr(1)						    PAM-PKCS#11 						  card_eventmgr(1)

NAME

       card_eventmgr - PCSC-Lite Event Manager

SYNTAX

       card_eventmgr [debug] [[no]daemon] [timeout=<msecs>] [config_file=<filename>] [kill] [pidfile=<pidfile>]

DESCRIPTION

       card_eventmgr  is  a  smart  card  monitoring  tool  that  listen  to the status of the card reader and dispatch actions on several events.
       card_eventmgr can be used for several actions: like screen lock on card removal.

       Three events are supported: card insertion, card removal and timeout on removed card. Actions are specified in a configuration file.

OPTIONS

       debug  Enable debugging output.

       [no]daemon
	      Runs in background if daemon or in foreground if nodaemon (default). If debug is unset, the program dettaches itself from the tty.

       timeout=<msecs>
	      Set polling timeout in milliseconds. Defaults to 1000 (1 second).

       config_file=<configuration file>
	      Sets de configuration file. Default value is /etc/pam_pkcs11/card_eventmgr.conf.

       pidfile=<pidfile>
	      Store the card_eventmgr process ID (pid) in the file pidfile.

       kill   Read a process id from pidfile and kill that process. You must use the argument pidfile=<pidfile> to use kill.

FILES

       /etc/pam_pkcs11/card_eventmgr.conf

EXAMPLES

       To run this program the standard way type:

	card_eventmgr

       Alternatively you can specify options:

	card_eventmgr debug nodaemon timeout=500 config_file=$HOME/.card_eventmgr.conf

       If you want to start and stop card_eventmgr automatically in an X11 session you can create a ~/.xsession file containing:
	# start the card autolock
	card_eventmgr pidfile=$HOME/.card_eventmgr.pid

	# start Gnome or something else
	/usr/bin/x-session-manager

	# kill the card autolock
	card_eventmgr kill pidfile=$HOME/.card_eventmgr.pid

BUGS

       Some applications like xscreensaver-command may fail due to external events (eg: try to unlock an unlocked session).   In  this	case,  the
       command incorrectly returns error code.

AUTHORS

       Juan Antonio Martinez <jonsito@teleline.es>
       Ludovic Rousseau <ludovic.rousseau@free.fr>

SEE ALSO

       pam_pkcs11(8), pkcs11_eventmgr(1), README.eventmgr, PAM-PKCS11 User Manual

Juan Antonio Martinez						     Aug 2005							  card_eventmgr(1)
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