CareerCup

when a process calls fork to create a child, fork returns the pid of child
it does not change the pid of the process
getpid will still show it's original pid

if a process called fork 100 times, each time fork will return a different pid (of the children) but getpid in the parent process is always the same

bigphatkdawg, understood thanks for the explanation

Parent process PID will always remain same irrespective of number of forks. Adding some working code for benefit of all.

#include<stdio.h>
#include<unistd.h>

main() 
{
    pid_t parent = getpid();
    int i;

    for (i = 1; i <= 5; i++)
    {
        pid_t forkpid;
        pid_t curprocess = getpid();

        if (curprocess == parent)  // Make sure we don't get into infinite loop
        {
            forkpid = fork();
            curprocess = getpid(); // override value for child
        }

        if (parent == curprocess)
            printf("Fork number: %d, parent process id %ld\n", i, (long)curprocess);
        else
            printf("Iteration number: %d, child process id %ld\n", i, (long)curprocess);
    }
}