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Top Forums UNIX for Advanced & Expert Users Finding process id of subsequent process Post 302366810 by matrixmadhan on Friday 30th of October 2009 11:18:14 AM
Old 10-30-2009
Finding process id of subsequent process

hi all,

I am trying to find the process id of the subsequent process created via fork and exec calls in perl.

For eg:
Code:
envVarSetter dataCruncher.exe < input.txt > output.txt

When I fork and exec the above command,
it returns only the pid of envVarSetter and I don't know how to find the pid of dataCruncher.exe

Option of pgrep, grepping by process name don't seem to suit my case and it will only involve additional processing. Also, multiple different parameters are passed which when grepped will return different values, so that's not a nice option

In short, is there a way to find out the pid of subsequent process executed in one command?
 

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TAPSET::KPROCESS(3stap) 												   TAPSET::KPROCESS(3stap)

NAME
tapset::kprocess - systemtap kernel process probe points DESCRIPTION
This family of probe points is used to probe the kernel's process activities. It contains the following probe points: kprocess.create Fires whenever a new process is successfully created, either as a result of one of the fork syscall variants, or a new kernel thread. Arguments: task a handle to the newly created process new_pid pid of the newly created process kprocess.start Fires immediately before a new process begins execution. Arguments: N/A kprocess.exec Fires whenever a process attempts to exec to a new program Arguments: filename the path to the new executable kprocess.exec_complete Fires at the completion of an exec call Arguments: errno the error number resulting from the exec success a boolean indicating whether the exec was successful kprocess.exit Fires when a process terminates. This will always be followed by a kprocess.release, though the latter may be delayed if the process waits in a zombie state. Arguments: code the exit code of the process kprocess.release Fires when a process is released from the kernel. This always follows a kprocess.exit, though it may be delayed somewhat if the process waits in a zombie state. Arguments: task a task handle to the process being released pid pid of the process being released SEE ALSO
stap(1), stapprobes(3stap) Intel, IBM TAPSET::KPROCESS(3stap)
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