/*-------------------------------------------------------------------*/
/* textforkexec.c                                                    */
/* The fork and exec system calls.                                   */
/*-------------------------------------------------------------------*/

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define MAX_COMMAND_SIZE 1024

int main(int argc, char *argv[])
{
   int iPid;
   char pcCommandName[MAX_COMMAND_SIZE];

   printf("testforkexec process (%ld)\n", (long)getpid());
   fflush(stdout);

   printf("Enter a command (no arguments, exit to stop):  ");
   fflush(stdout);
   scanf("%s", pcCommandName);
   while (strcmp(pcCommandName, "exit") != 0)
   {
      iPid = fork();
      if (iPid == -1)
      {
         perror(argv[0]);
         return 1;
      }

      if (iPid == 0)
      {
         char *ppcArgv[2];
         ppcArgv[0] = pcCommandName;
         ppcArgv[1] = NULL;
         execvp(ppcArgv[0], ppcArgv);
         perror(argv[0]);
         _exit(1);
      }

      printf("Enter a command (no arguments, exit to stop):  ");
      fflush(stdout);
      scanf("%s", pcCommandName);
   }

   return 0;
}


/* Sample execution:

$ gcc -o hello hello.c
$ gcc -o testforkexec testforkexec.c
$ testforkexec
testforkexec process (2357)
Enter a command (no arguments, exit to stop):  hello
Enter a command (no arguments, exit to stop):  hello process (2364)
Hello world.
date
Enter a command (no arguments, exit to stop):  Wed Apr 24 15:53:36 EDT 2002
xxx
Enter a command (no arguments, exit to stop):  testforkexec: No such file or directory
exit
$

*/

/* Note:  Malformed! */