sysdeps/unix/sysv/linux/tst-sysconf-iov_max.c

   1 /* Check IOV_MAX definition for consistency (bug 22321).
   2    Copyright (C) 2017-2024 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    <https://www.gnu.org/licenses/>.  */
  18
  19 /* Defined in tst-sysconf-iov_max-uapi.c.  */
  20 long uio_maxiov_value (void);
  21
  22
  23 #include <limits.h>
  24 #include <support/check.h>
  25 #include <sys/uio.h>
  26 #include <unistd.h>
  27
  28 static int
  29 do_test (void)
  30 {
  31   TEST_VERIFY (_XOPEN_IOV_MAX == 16); /* Value required by POSIX.  */
  32   TEST_VERIFY (uio_maxiov_value () >= _XOPEN_IOV_MAX);
  33   TEST_VERIFY (IOV_MAX == uio_maxiov_value ());
  34   TEST_VERIFY (UIO_MAXIOV == uio_maxiov_value ());
  35   TEST_VERIFY (sysconf (_SC_UIO_MAXIOV) == uio_maxiov_value ());
  36   TEST_VERIFY (sysconf (_SC_IOV_MAX) == uio_maxiov_value ());
  37   return 0;
  38 }
  39
  40 #include <support/test-driver.c>