1 #include <stdio.h>
 2 #include <sys/types.h>
 3 #include <sys/wait.h>
 4 #include <unistd.h>
 5
 6
 7 int main(int argc, char **argv) {
 8     pid_t childPID = fork();
 9
10     if (childPID < 0) {
11         // An error occured
12         fprintf(stderr, "Could not fork!\n");
13         return -1;
14     } else if (childPID == 0) {
15
16         // We are in the child process
17         printf("The child process is executing...\n");
18         sleep(2);
19
20     } else {
21
22         // We are in the parent process
23         if (wait(NULL) < 0) {
24             fprintf(stderr, "Could not wait for child!\n");
25             return -1;
26         }
27         printf("Everything is done!\n");
28
29     }
30
31     return 0;
32 }