io/tst-read-zero.c

   1 /* read smoke test for 0-sized structures.
   2    Copyright The GNU Toolchain Authors.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* Zero-sized structures should not result in any overflow warnings or
  20    errors when fortification is enabled.  */
  21 #include <fcntl.h>
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <support/check.h>
  25
  26 int
  27 do_test (void)
  28 {
  29   struct test_st {} test_info[16];
  30   int fd = open ("/dev/zero", O_RDONLY, 0);
  31
  32   if (fd == -1)
  33     FAIL_UNSUPPORTED ("Unable to open /dev/zero: %m");
  34
  35   TEST_VERIFY_EXIT (read (fd, test_info, sizeof(test_info)) == 0);
  36   return 0;
  37 }
  38
  39 #include <support/test-driver.c>