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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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setpgrp(2)							System Calls Manual							setpgrp(2)

NAME
setpgrp - set process group ID SYNOPSIS
DESCRIPTION
If the calling process is not already a session leader, sets the process group ID of the calling process to the process ID of the calling process. If creates a new session, then the new session has no controlling terminal. The function has no effect when the calling process is a session leader. Security Restrictions Some or all of the actions associated with this system call may require privileges. See privileges(5) for more information. RETURN VALUE
Upon successful completion, returns the new process group ID. ERRORS
If fails, no changes occur and (see errno(2)) is set to one of the following values: The calling process is already a process group leader or the process group ID of a process other than the calling process matches the process ID of the calling process. The calling process does not have sufficient privileges. SEE ALSO
exec(2), fork(2), getpid(2), getsid(2), kill(2), setpgrp3(2), setsid(2), privileges(5), <unistd.h>. STANDARDS CONFORMANCE
setpgrp(2)
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