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 #ifndef RWF_HIPRI
  26 # define RWF_HIPRI 0
  27 #endif
  28 #ifndef RWF_DSYNC
  29 # define RWF_DSYNC 0
  30 #endif
  31 #ifndef RWF_SYNC
  32 # define RWF_SYNC 0
  33 #endif
  34 #ifndef RWF_NOWAIT
  35 # define RWF_NOWAIT 0
  36 #endif
  37 #define RWF_SUPPORTED   (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT)
  38   /* Set the next bit from the mask of all supported flags.  */
  39   int invalid_flag = RWF_SUPPORTED != 0 ? __builtin_clz (RWF_SUPPORTED) : 2;
  40   invalid_flag = 0x1 << ((sizeof (int) * CHAR_BIT) - invalid_flag);
  41
  42   char buf[32];
  43   const struct iovec vec = { .iov_base = buf, .iov_len = sizeof (buf) };
  44   if (preadv2 (temp_fd, &vec, 1, 0, invalid_flag) != -1)
  45     FAIL_EXIT1 ("preadv2 did not fail with an invalid flag");
  46   if (errno != ENOTSUP)
  47     FAIL_EXIT1 ("preadv2 failure did not set errno to ENOTSUP (%d)", errno);
  48
  49   /* This might fail for compat syscall (32 bits running on 64 bits kernel)
  50      due a kernel issue.  */
  51   if (pwritev2 (temp_fd, &vec, 1, 0, invalid_flag) != -1)
  52     FAIL_EXIT1 ("pwritev2 did not fail with an invalid flag");
  53   if (errno != ENOTSUP)
  54     FAIL_EXIT1 ("pwritev2 failure did not set errno to ENOTSUP (%d)", errno);
  55 }