#include <sys/types.h>
#include <stdio.h>
#include <unistd.h> /* for write*/
#include <stdlib.h> /* for exit */

int      glob = 6;		/* external variable in initialized data */
char     buf[] = "a write to stdout\n";

int main(void) {
      int     var;		/* automatic variable on the stack */
      pid_t   pid;

      var = 88;
      if (write( STDOUT_FILENO, buf, sizeof(buf)-1) != sizeof(buf)-1) {
      	printf("write error\n");
      	exit(-1);
      }
      
      printf("before fork %i\n", STDOUT_FILENO);	/* we don't flush stdout */
        /*fflush(stdout);*/

      if ( (pid = fork()) < 0) {
      	printf("fork error\n");
      	exit(-1);
      }
      
      else if (pid == 0) {		/* child */
      	glob++;		                /* modify variables */
      	var++;
      } else
      sleep(2);      			/* parent */

      printf("pid = %d, ppid=%d, glob = %d, var = %d\n", getpid(), getppid(), glob, var);
      exit(0);
}