Finding Out When A Process Has Finished? Post: 9677

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Top Forums UNIX for Advanced & Expert Users Finding Out When A Process Has Finished? Post 9677 by 1cuervo on Thursday 1st of November 2001 03:20:47 AM

11-01-2001

Registered User

Thanks for your tips! I have one more query concerning PIDs:

On a typical UNIX machine (whatever that is!), how often is a specific PID likely to be allocated to a process? Of course, this will depend on the number of processes running, but I was just curious to see if there is a chance that during the time between my checks to see if processes are running, one of my processes terminates and it's PID is actually applied to a new process, thus giving my application the impression that the terminated process is still running, when in fact it has finished & the PID being searched for actually belongs to a completely different process!

My application is currently checking all PIDs at 5-minute intervals, so in the worst case scenario, the same PID would have to be allocated within a time-frame of 4:59 minutes. This seems unlikely.

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getpgid

getpgid(2)							System Calls Manual							getpgid(2)

NAME

       getpgid - Gets process group ID

LIBRARY

       Standard C Library (libc.a)

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>
       pid_t getpgid(	   pid_t pid);

PARAMETERS

       Specifies the process ID of the target process; zero implies the calling process.

DESCRIPTION

       The  getpgid()  function returns the process group ID of the process specified by the process ID pid.  Specifying a pid of 0 (zero) returns
       the process group ID of the calling process.

RETURN VALUES

       The getpgid() function returns the process group ID of the process specified.  If there was an error, a value of -1 is returned	and  errno
       is set to indicate the error.

ERRORS

       If  any	of  the following conditions occurs, the getpgid() function sets errno to the corresponding value: The specified process is not in
       the same session as the calling process, and the calling process lacks sufficient privilege to read the specified  process.   As  released,
       Tru64 UNIX does not check the privilege.  No process has been found that has a process ID identical to that specified by the pid parameter.

RELATED INFORMATION

       Functions: exec(2), fork(2), setpgid(2) delim off

																	getpgid(2)