fork() system call in c

Question

    #include 
    #include 
    int main()
    {
       fork();
       fork() && fork() || fork();
       fork();

     printf         


        

Answer 1

You should not use fork() like this. Never. And, nevertheless, you won't need to do so in real life. How to use it:

int main() {
    /* code */
    pid_t pid = fork();
    if (pid < 0) {
        /* error, no child process spawned */
    }
    if (pid > 0) {
        /* we are the parent process, pid is the process ID of the ONE child process spawned */
    }
    /* else, we are the child process, running exactly one command later the fork() was called in the parent. */
    /* some more code */
    return 0;
}