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Calling fork multiple times

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <sys/types.h> #include <sys/wait.h> int main(int argc, char* argv[]) { int id1 = fork(); int id2 = fork(); if (id1 == 0) { if (id2 == 0) { printf("We are process y\n"); } else { printf("We are process x\n"); } } else { if (id2 == 0) { printf("We are process z\n"); } else { printf("We are the parent process\n"); } } while (wait(NULL) != -1 || errno != ECHILD) { printf("Waited for a child to finish\n"); } return 0; }