ITEM: J3247L

How to determine if process is still running.

Question:

Is there is a function that can used to determine if a process is still 
running.  Customer wants a function that can be executed by a non-root 
user by which it can be determined whether or not a process, which may 
or not be a child of the calling non-root user is still extant.

Response:

The method to use to do the above is to issue:
    kill(pid, 0)
If the return code is  0, process exists and belongs to user.
If the return code is -1 and errno = EPERM, process exists and
    belongs to someone else.
If the return code is -1 and errno = ESRCH, process is no longer extant.



Support Line: How to determine if process is still running. ITEM: J3247L

Dated: May 1994 Category: N/A

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