What does fork() actually return?
main.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
int main(int argc, char* argv[]) {
int id = fork();
// Inside parent process - child process id - it's going to be different than getpid()
// Inside child process - 0 - it's going to be different than getpid()
if (id == 0) {
sleep(1);
}
printf("Returned by fork: %d, Current ID: %d, parent ID: %d\n", id, getpid(), getppid());
int res = wait(NULL);
if (res == -1) {
printf("No children to wait for\n");
} else {
printf("%d finished execution\n", res);
}
return 0;
}