Question

Is it possible to change the PID in Linux? If anyone know, please tell me.

Requirement: actually I want to bring up the back ground process to foreground, which is being run under the init. So if I can change the PID or parent PID of the process, I can achieve my goal.

Answer 1

No, it’s not possible to do such a thing on Unix. You might be able to use fork to achieve this effect, but you have to tell us what you are trying to achieve.

pid_t pid;

/* I want a new PID. */
pid fork();
if (pid == 0) {
    /* getpid() will show I've got a new PID. */
else
    _exit(0); /* Parent or check for -1 (tinfoil hat)

Obviously, like I said before, you “might” be able to use this.