/* main.cc
 *
 */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <pthread.h>

void usage()
  {
  printf("Usage:\n");
  printf("-p <program>  - use program instead of /bin/ls \n");
  exit(1);
  }

void * forkit2me(void *data)
  {

  pid_t pid;

  printf("forking\n");
  if ((pid = fork()) < 0 )
    {
    printf("Unable to fork\n");
    }
  else if (pid == 0 )
    {
    printf ("child\n");

    execve((char *)data,NULL,NULL);

    exit(-1);
    }
  else
    {
    printf ("parent\n");
    }
  printf ("done here\n");
  }

int main(int argc, char * argv[])
  {
  int quit=0;

  char * prog2run = "/bin/ls";
  if (argc > 0)
    {
    for (int i=1; i < argc; i++)
      {
      if ( argv[i][0]== '-' )
        {
        switch (argv[i][1])
          {
          case 'p':
            if ( i+1 < argc )
              {
              prog2run=argv[i+1];
              i++;
              }
            break;
          default:
            usage();
          }
        }
      }
    }

  fcntl( fileno( stdout ), F_SETFD, 1 );
  fcntl( fileno( stderr ), F_SETFD, 1 );

  int rc;
  pthread_attr_t ta;
  pthread_t threadId;
  while (!quit)
    {
    printf("here we go\n");
    rc=pthread_attr_init(&ta);
    if (rc)
      {
      printf("pthread_attr_init failed: rc (%d)\n",rc);
      break;
      }
 
    rc=pthread_attr_setdetachstate(&ta,PTHREAD_CREATE_DETACHED);
    if (rc)
      {
      printf("pthread_attr_setdetachstate failed: rc (%d)\n",rc);
      break;
      }

#ifdef PRFAIL
    printf("creating thread\n");
#endif
    rc=pthread_create(&threadId, &ta, forkit2me, prog2run);
    if (rc)
      {
      printf("pthread_create failed: rc (%d)\n",rc);
      break;
      }
#ifdef PRFAIL
    printf("created\n");
#endif
 
    pthread_attr_destroy(&ta);
#ifdef PRFAIL
    printf("destory\n");
#endif
 
    }

  return 0;
  }