Create a child process

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <unistd.h>
 4 
 5 
 6 int main(void)
 7 {
 8     pid_t pid;
 9     pid = fork();
10     if(pid < 0){
11         perror("fail to fock!\n");
12         exit(-1);
13     }
14     else if(pid == 0){
15         /*子进程*/
16         printf("Sub-process,PID: %u,PPID: %u\n",getpid(),getppid());
17     }
18     else{
19         /*父进程*/
20         printf("Parent,PID: %u,Sub-process PID: %u\n",getpid(),pid);
21         sleep(2);
22     }
23     return 0;
24 }