Process Identification

In the system, there are lots of processes. We can identify one process uniquely by its Process ID or PID.

We have a special system call getpid() to retrieve the PID of the current process.

/* GettingStarted/getpid.c */
#include <stdio.h>
#include <unistd.h>

int main(int argc,char *argv[])
{
    printf("My PID is %d\n",getpid());
}

You can run multiple time to check the pid changes!