text: /* $OpenBSD: closefrom.c,v 1.1 2004/01/15 22:22:52 marc Exp $ */
  
  /* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
  
  #include <errno.h>
  #include <pthread.h>
  #include <unistd.h>
  
  #include "test.h"
  
  static void *
  dummy_thread(void* arg)
  {
  	/* just exit */
  	return NULL;
  }
  
  /*
   * Test that closefrom does the right thing in a threaded programs,
   * specifically that it doesn't kill the thread kernel signal pipe.
   */
  int
  main(int argc, char *argv[])
  {
  	pthread_t thread;
  	void *status;
  	int fd;
  	int result;
  
  	/* close files above stderr.   The kernel pipes shouldn't be touched */
  	fd = STDERR_FILENO + 1;
  	result = closefrom(fd);
  	printf("closefrom(%d) == %d/%d\n", fd, result, errno);
  
  	/* do it again: make sure that the result is -1/EBADF */
  	result = closefrom(fd);
  	printf("closefrom(%d) == %d/%d\n", fd, result, errno);
  	ASSERT(result == -1 && errno == EBADF);
  
  	/* start a thread to verify the thread kernel is working */
  	CHECKr(pthread_create(&thread, NULL, dummy_thread, NULL));
  	CHECKr(pthread_join(thread, &status));
  	printf("dummy thread exited with status %p\n", status);
  
  	SUCCEED;
  	return 0;
  }
  