Add the statx function

1 files changed, 157 insertions, 0 deletions

diff --git a/io/tst-statx.c b/io/tst-statx.c
new file mode 100644
index 0000000000..61bf31d177
--- /dev/null
+++ b/io/tst-statx.c
@@ -0,0 +1,157 @@
+/* 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>