ipc/fork_execlp.c

   1 /* compile with:
   2    gcc fork_execlp.c -o fork_execlp -Wall -W -Wextra -ansi -pedantic */
   3
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7 #include <sys/wait.h>
   8
   9 int main(void)
  10 {
  11     pid_t pid;
  12     int retval;
  13
  14     if ((pid = fork()) < 0) {  /* fork error */
  15         perror("fork");
  16         exit(EXIT_FAILURE);
  17     }
  18
  19     else if (pid > 0)          /* parent process */
  20         wait(&retval);
  21
  22     else {                     /* child process (pid = 0) */
  23         if (execlp("date", "date", (char *)0) < 0) {
  24             perror("execlp");
  25             exit(EXIT_FAILURE);
  26         }
  27     }
  28
  29     /* whatever goes here, will be executed from the
  30        parent AND the child process as well  */
  31
  32    return EXIT_SUCCESS;
  33 }