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Top Forums UNIX for Advanced & Expert Users How can i get the parent process only? Post 302214358 by fsahog on Sunday 13th of July 2008 05:33:56 PM
Old 07-13-2008
Process management

I think you're seeing two due to your invocation method. One method that would be more "tight" would be to have your process write it's PID to a PID file, or have the script write it if necessary. Then check to see if the PID is running, rather than guessing by checking for the existence of a file. ABEND-ing programs rarely clean up after themselves. PID's are either in use or not. The only possible hole in this logic is that PID's are reused periodically as the PID integer is incremented through it's max. The likelihood of that error is quite very very low.
 

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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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