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Solaris
keeping a process alive ?
Post 302474538 by Praveen_218 on Wednesday 24th of November 2010 01:23:16 PM
11-24-2010
Try this ....
In order to know, if a process is running or gone, I can suggest you two methods:
1) Use pidof <name of your program> and check its return value which should be any number as the pid of your process but should not be zero. So if you get zero as return value, means the process is gone.
2) You may use ls /proc/<pid_of_your_process> should be sucessful. Meaning check the value of $? immediately and the decide, if your process is running or gone.
Now write a parent script which loops for ever (like while (1) ...) and checks the process state everytime, if your process is found to be not running then invoke the process again and sleep for a reasonable time to allow the process up and running before your this parent script loops to check the status of your process for the next time.
Also invoke your process, from this parent script, using nohup <your_process_name> &, as you would be knowing to allow your process run in the background and asynchronously to this script.
Cheers!!!!!!!!!!!!
1) Use pidof <name of your program> and check its return value which should be any number as the pid of your process but should not be zero. So if you get zero as return value, means the process is gone.
2) You may use ls /proc/<pid_of_your_process> should be sucessful. Meaning check the value of $? immediately and the decide, if your process is running or gone.
Now write a parent script which loops for ever (like while (1) ...) and checks the process state everytime, if your process is found to be not running then invoke the process again and sleep for a reasonable time to allow the process up and running before your this parent script loops to check the status of your process for the next time.
Also invoke your process, from this parent script, using nohup <your_process_name> &, as you would be knowing to allow your process run in the background and asynchronously to this script.
Cheers!!!!!!!!!!!!
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LEARN ABOUT LINUX
pidof
PIDOF(8) Linux System Administrator's Manual PIDOF(8) NAME
pidof -- find the process ID of a running program. SYNOPSIS
pidof [-s] [-c] [-n] [-x] [-o omitpid[,omitpid..]] [-o omitpid[,omitpid..]..] program [program..] DESCRIPTION
Pidof finds the process id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts are located in /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead. OPTIONS
-s Single shot - this instructs the program to only return one pid. -c Only return process ids that are running with the same root directory. This option is ignored for non-root users, as they will be unable to check the current root directory of processes they do not own. -n Avoid stat(2) system function call on all binaries which are located on network based file systems like NFS. Instead of using this option the the variable PIDOF_NETFS may be set and exported. -x Scripts too - this causes the program to also return process id's of shells running the named scripts. -o omitpid Tells pidof to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro- gram, in other words the calling shell or shell script. EXIT STATUS
0 At least one program was found with the requested name. 1 No program was found with the requested name. NOTES
pidof is actually the same program as killall5; the program behaves according to the name under which it is called. When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that it returns pids of running programs that happen to have the same name as the program you're after but are actually other programs. Note that that the executable name of running processes is calculated with readlink(2), so symbolic links to executables will also match. SEE ALSO
shutdown(8), init(8), halt(8), reboot(8), killall5(8) AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl 01 Sep 1998 PIDOF(8)