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Top Forums UNIX for Advanced & Expert Users Finding Out When A Process Has Finished? Post 9622 by 1cuervo on Wednesday 31st of October 2001 06:31:26 AM
Old 10-31-2001
Finding Out When A Process Has Finished?

Problem

I have an application which basically runs lots of UNIX programs remotely, using the Telnet protocol. For each program it remotely executes, it stores the process ID (PID) for that process.

At regular intervals, I would like my application to take the PID for every process still running and find out if it is still running, or if it has terminated.

Solution

What is the most elegant, or the cleanest way of finding out whether a process is still running? Bear in mind that it is a program doing the checking, not a human!

My idea was simply to execute a "ps -p <PID>" command for every PID and if there are no entries, the process has terminated, otherwise it must still be running.

What do you think? Thankyou very much.
 

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kill.d(1m)							   USER COMMANDS							kill.d(1m)

NAME
kill.d - snoop process signals as they occur. Uses DTrace. SYNOPSIS
kill.d DESCRIPTION
kill.d is a simple DTrace program to print details of process signals as they are sent, such as the PID source and destination, signal num- ber and result. This program can be used to determine which process is sending signals to which other process. Since this uses DTrace, only users with root privileges can run this command. EXAMPLES
Default output, print process signals as they are sent. # kill.d FIELDS
FROM source PID COMMAND source command name TO destination PID SIG destination signal ("9" for a kill -9) RESULT result of signal (-1 is for failure) DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver- bose descriptions explaining the output. EXIT
kill.d will run forever until Ctrl-C is hit. AUTHOR
Brendan Gregg [Sydney, Australia] SEE ALSO
dtrace(1M), truss(1) version 0.90 May 14, 2005 kill.d(1m)
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