misc/tst-preadvwritev2-common.c

   1 /* Common function for preadv2 and pwritev2 tests.
   2    Copyright (C) 2017 Free Software Foundation, Inc.
   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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <limits.h>
  20 #include <support/check.h>
  21
  22 static void
  23 do_test_with_invalid_flags (void)
  24 {
  25 #define RWF_SUPPORTED   (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT)
  26   /* Set the next bit from the mask of all supported flags.  */
  27   int invalid_flag = __builtin_clz (RWF_SUPPORTED);
  28   invalid_flag = 0x1 << ((sizeof (int) * CHAR_BIT) - invalid_flag);
  29
  30   char buf[32];
  31   const struct iovec vec = { .iov_base = buf, .iov_len = sizeof (buf) };
  32   if (preadv2 (temp_fd, &vec, 1, 0, invalid_flag) != -1)
  33     FAIL_EXIT1 ("preadv2 did not fail with an invalid flag");
  34   if (errno != ENOTSUP)
  35     FAIL_EXIT1 ("preadv2 failure did not set errno to ENOTSUP (%d)", errno);
  36
  37   /* This might fail for compat syscall (32 bits running on 64 bits kernel)
  38      due a kernel issue.  */
  39   if (pwritev2 (temp_fd, &vec, 1, 0, invalid_flag) != -1)
  40     FAIL_EXIT1 ("pwritev2 did not fail with an invalid flag");
  41   if (errno != ENOTSUP)
  42     FAIL_EXIT1 ("pwritev2 failure did not set errno to ENOTSUP (%d)", errno);
  43 }