Use brute force and ignorance to run a program with a specified PID

pidforce.c

#include <unistd.h>
#include <stdlib.h>
int main(int argc, char** argv) {
    int targetPid = atoi(argv[1]);
    for(;;) {
        int newPid = fork();
        if (newPid == 0) { //child
            newPid = getpid();
            if (newPid == targetPid) {
                execv(argv[2], argv + 3);
            } else {
                exit(0);
            }
        } else {
            if (newPid == targetPid) {
                exit(0);
            } else {
                wait(NULL);
            }
        }
    }
}