ipc/fork_execlp.c

   1 /*
   2  * Compile with:
   3  * gcc fork_execlp.c -o fork_execlp -Wall -W -Wextra -ansi -pedantic
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9 #include <sys/wait.h>
  10
  11 int main(void)
  12 {
  13     pid_t pid;
  14     int retval;
  15
  16     if ((pid = fork()) < 0) {  /* fork error */
  17         perror("fork");
  18         exit(EXIT_FAILURE);
  19     }
  20
  21     else if (pid > 0)          /* parent process */
  22         wait(&retval);
  23
  24     else {                     /* child process (pid = 0) */
  25         if (execlp("date", "date", (char *)0) < 0) {
  26             perror("execlp");
  27             exit(EXIT_FAILURE);
  28         }
  29     }
  30
  31     /*
  32      * Whatever goes here, will be executed from the
  33      * parent AND the child process as well
  34      */
  35
  36    return EXIT_SUCCESS;
  37 }