05-03-2005
There is not any general way to do this unix. Each OS has different ways to handle it and some are very hard. You mention Linux though. With Linux, the info is in the /proc filesystem. To get the command line for process id 9999, read the file "/proc/9999/cmdline".
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setpgid(2) System Calls Manual setpgid(2)
NAME
setpgid(), setpgrp2() - set process group ID for job control
SYNOPSIS
DESCRIPTION
The and system calls cause the process specified by pid to join an existing process group or create a new process group within the session
of the calling process. The process group ID of the process whose process ID is pid is set to pgid. If pid is zero, the process ID of the
calling process is used. If pgid is zero, the process ID of the indicated process is used. The process group ID of a session leader does
not change.
is provided for backward compatibility only.
Security Restrictions
Some or all of the actions associated with this system call are subject to compartmental restrictions.
See compartments(5) for more information about compartmentalization on systems that support that feature. Compartmental restrictions can
be overridden if the process possesses the privilege (COMMALLOWED). Processes owned by the superuser may not have this privilege. Pro-
cesses owned by any user may have this privilege, depending on system configuration.
See privileges(5) for more information about privileged access on systems that support fine-grained privileges.
RETURN VALUE
and return the following values:
Successful completion.
Failure.
is set to indicate the error.
ERRORS
If or fails, is set to one of the following values.
The value of pid matches the process ID of a child process of the calling process and the child process has successfully executed
one of the exec(2) functions.
The value of pgid is less than zero or is outside the range of valid process group ID values.
The process indicated by
pid is a session leader.
The value of pid is valid but matches the process ID of a child process of the calling process, and the child process is not in
the same session as the calling process.
The value of pgid does not match the process ID of the process indicated by pid and there is no process with a process group ID
that matches the value of pgid in the same session as the calling process.
The value of pid does not match the process ID of the calling process or of a child process of the calling process.
AUTHOR
and were developed by HP and the University of California, Berkeley.
SEE ALSO
bsdproc(3C), exec(2), exit(2), fork(2), getpid(2), kill(2), setsid(2), signal(2), privileges(5), termio(7).
STANDARDS CONFORMANCE
setpgid(2)