ipc/fork_execlp.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <sys/wait.h>
   5
   6 int main(void)
   7 {
   8     pid_t pid;
   9     int retval;
  10
  11     if ((pid = fork()) < 0) {  /* fork error */
  12         perror("fork");
  13         exit(EXIT_FAILURE);
  14     }
  15
  16     else if (pid > 0)          /* parent process */
  17         wait(&retval);
  18
  19     else if (pid == 0) {       /* child process */
  20         if (execlp("date", "date", (char *)0) < 0) {
  21             perror("execlp");
  22             exit(EXIT_FAILURE);
  23         }
  24     }
  25
  26    return EXIT_SUCCESS;
  27 }