TD3/exo3/exo3.c

   1 #include <unistd.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <sys/types.h>
   5 #include <wait.h>
   6
   7 int main()
   8 {
   9         pid_t pid;
  10
  11         if ((pid = fork()) == -1) {
  12                 perror("erreur");
  13                 exit(EXIT_FAILURE);
  14         } else if (pid == 0) {
  15                 execlp("who", "who", NULL);
  16                 perror("execlp");
  17                 exit(1);
  18         }
  19
  20         // without it just exec with the &
  21         // with it exec with the ;
  22         wait(NULL);
  23
  24         if ((pid = fork()) == -1) {
  25                 perror("erreur");
  26                 exit(EXIT_FAILURE);
  27         } else if (pid == 0) {
  28                 execlp("ps", "ps", NULL);
  29                 perror("execlp");
  30                 exit(1);
  31         }
  32
  33         wait(NULL);
  34
  35         execlp("ls", "ls", "-l", NULL);
  36         perror("execlp");
  37 }