unlink ("aaa");
unlink (tmpl);
do_test (void){  char tmpl[] = "/tmp/tst-put-error.XXXXXX";  int fd = mkstemp (tmpl);  if (fd == -1)    error (EXIT_FAILURE, errno, "cannot create temporary file");  FILE *fp = fdopen (fd, "w");  if (fp == NULL)    error (EXIT_FAILURE, errno, "fdopen");  setlinebuf (fp);  close (fd);  unlink ("aaa");  int n = fprintf (fp, "hello world\n");  printf ("fprintf = %d\n", n);  if (n >= 0)    error (EXIT_FAILURE, 0, "first fprintf succeeded");  n = fprintf (fp, "hello world\n");  printf ("fprintf = %d\n", n);  if (n >= 0)    error (EXIT_FAILURE, 0, "second fprintf succeeded");  return 0;}