Re: off-topic ->UNIX question

hello

hey - this is a great and really comprehensive explanation.

>>> jherrick_at_host.ott.igs.net 09/03/02 14:36 PM >>>

Hello

Processes can test the validity of PID's by signalling the PID with a ZERO signal number. To signal the process you use the kill() system call. When a zero signal number is used error checking is done but no signal is sent so that you don't have to worry about what the process is going to do with a untrapped or ill-defined interrupt handler

eg.

#include <stdio.h>
#include <signal.h>

main(int argc, char *argv[])
{
  int pidno = atoi(argv[1]);
  if(kill(pidno,0) == 0)
    printf("pid number %d exists\n",pidno);   else
    printf("pid number %d does not exist (or does not belong to you)\n",pidno);
  exit(0);
}

The above code will check the pid passed as the first command line argument to the program. Note that you can't signal arbitrary processes unless you are the superuser or the process is owned by your userid.

HTH Jeff Herrick

On Tue, 3 Sep 2002, Santosh Varma wrote:

> Hello all,
>
> I get a process id by calling getProcessId()..I want to know from
> program whether that processId exists.
> Any way to find out how ?
>
> Thanks and regards,
> Santosh
>

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