/* Basic test of statx system call.

   Copyright (C) 2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <stdbool.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <support/check.h>

#include <support/support.h>

#include <support/temp_file.h>

#include <support/xunistd.h>

#include <sys/stat.h>

#include <sys/syscall.h>

#include <sys/sysmacros.h>

#include <unistd.h>

/* Ensure that the types have the kernel-expected layout.  */

_Static_assert (sizeof (struct statx_timestamp) == 16, "statx_timestamp size");

_Static_assert (sizeof (struct statx) == 256, "statx size");

_Static_assert (offsetof (struct statx, stx_nlink) == 16, "statx nlink");

_Static_assert (offsetof (struct statx, stx_ino) == 32, "statx ino");

_Static_assert (offsetof (struct statx, stx_atime) == 64, "statx atime");

_Static_assert (offsetof (struct statx, stx_rdev_major) == 128, "statx rdev");

_Static_assert (offsetof (struct statx, __statx_pad2) == 144, "statx pad2");

#include "statx_generic.c"

typedef int (*statx_function) (int, const char *, int, unsigned int,

                               struct statx *);

/* Return true if we have a real implementation of statx.  */

static bool

kernel_supports_statx (void)

{

#ifdef __NR_statx

  struct statx buf;

  return syscall (__NR_statx, 0, "", AT_EMPTY_PATH, 0, &buf) == 0

    || errno != ENOSYS;

#else

  return false;

#endif

}

/* Tests which apply to both implementations.  */

static void

both_implementations_tests (statx_function impl, const char *path, int fd)

{

  uint64_t ino;

  {

    struct statx buf = { 0, };

    TEST_COMPARE (statx (fd, "", AT_EMPTY_PATH, STATX_BASIC_STATS, &buf), 0);

    TEST_COMPARE (buf.stx_size, 3);

    ino = buf.stx_ino;

  }

  {

    struct statx buf = { 0, };

    TEST_COMPARE (statx (AT_FDCWD, path, 0, STATX_BASIC_STATS, &buf), 0);

    TEST_COMPARE (buf.stx_size, 3);

    TEST_COMPARE (buf.stx_ino, ino);

  }

  {

    struct statx stx = { 0, };

    TEST_COMPARE (statx (fd, "", AT_EMPTY_PATH, STATX_BASIC_STATS, &stx), 0);

    struct stat64 st;

    xfstat (fd, &st);

    TEST_COMPARE (stx.stx_mode, st.st_mode);

    TEST_COMPARE (stx.stx_dev_major, major (st.st_dev));

    TEST_COMPARE (stx.stx_dev_minor, minor (st.st_dev));

  }

  {

    struct statx stx = { 0, };

    TEST_COMPARE (statx (AT_FDCWD, "/dev/null", 0, STATX_BASIC_STATS, &stx),

                  0);

    struct stat64 st;

    xstat ("/dev/null", &st);

    TEST_COMPARE (stx.stx_mode, st.st_mode);

    TEST_COMPARE (stx.stx_dev_major, major (st.st_dev));

    TEST_COMPARE (stx.stx_dev_minor, minor (st.st_dev));

    TEST_COMPARE (stx.stx_rdev_major, major (st.st_rdev));

    TEST_COMPARE (stx.stx_rdev_minor, minor (st.st_rdev));

  }

}

/* Tests which apply only to the non-kernel (generic)

   implementation.  */

static void

non_kernel_tests (statx_function impl, int fd)

{

  /* The non-kernel implementation must always fail for explicit sync

     flags.  */

  struct statx buf;

  errno = 0;

  TEST_COMPARE (impl (fd, "", AT_EMPTY_PATH | AT_STATX_FORCE_SYNC,

                      STATX_BASIC_STATS, &buf), -1);

  TEST_COMPARE (errno, EINVAL);

  errno = 0;

  TEST_COMPARE (impl (fd, "", AT_EMPTY_PATH | AT_STATX_DONT_SYNC,

                      STATX_BASIC_STATS, &buf), -1);

  TEST_COMPARE (errno, EINVAL);

}

static int

do_test (void)

{

  char *path;

  int fd = create_temp_file ("tst-statx-", &path);

  TEST_VERIFY_EXIT (fd >= 0);

  support_write_file_string (path, "abc");

  both_implementations_tests (&statx, path, fd);

  both_implementations_tests (&statx_generic, path, fd);

  if (kernel_supports_statx ())

    {

      puts ("info: kernel supports statx");

      struct statx buf;

      buf.stx_size = 0;

      TEST_COMPARE (statx (fd, "", AT_EMPTY_PATH | AT_STATX_FORCE_SYNC,

                           STATX_BASIC_STATS, &buf),

                    0);

      TEST_COMPARE (buf.stx_size, 3);

      buf.stx_size = 0;

      TEST_COMPARE (statx (fd, "", AT_EMPTY_PATH | AT_STATX_DONT_SYNC,

                           STATX_BASIC_STATS, &buf),

                    0);

      TEST_COMPARE (buf.stx_size, 3);

    }

  else

    {

      puts ("info: kernel does not support statx");

      non_kernel_tests (&statx, fd);

    }

  non_kernel_tests (&statx_generic, fd);

  xclose (fd);

  free (path);

  return 0;

}

#include <support/test-driver.c>