/* fork.c */
#include <sys/types.h>

int global_variable = 0;

void main(int argc, char *argv[])
{
  int local_variable = 0;
  pid_t pid;

  printf("before fork\n");
  if ((pid = fork()) < 0) {
    printf("error on fork\n");
    exit(1);
  } else if (pid == 0) {  /* child does this */
    global_variable++;
    local_variable++;
  } else {                /* parent does this */
  }
  printf("pid = %d, global_variable = %d, local_variable = %d\n",
         getpid(), global_variable, local_variable);
  exit(0);
}
/* end of fork.c */