* io/fcntl.h: Declare openat and openat64.

	* io/Makefile (routines): Add openat and openat64.
	(tests): Add tst-openat.
	* io/Versions: Add openat and openat64 for GLIBC_2.4.
	* sysdeps/generic/openat.c: New file.
	* sysdeps/generic/openat64.c: New file.
	* sysdeps/unix/sysv/linux/openat.c: New file.
	* sysdeps/unix/sysv/linux/openat64.c: New file.
	* io/tst-openat.c: New file.

	* sysdeps/unix/sysv/linux/device-nrs.h: Add info for /dev/full.

1 files changed, 163 insertions, 0 deletions

diff --git a/io/tst-openat.c b/io/tst-openat.c
new file mode 100644
index 0000000000..c20c95a10d
--- /dev/null
+++ b/io/tst-openat.c
@@ -0,0 +1,163 @@
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+static void prepare (void);
+#define PREPARE(argc, argv) prepare ()
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+
+#include "../test-skeleton.c"
+
+static int dir_fd;
+
+static void
+prepare (void)
+{
+  size_t test_dir_len = strlen (test_dir);
+  static const char dir_name[] = "/tst-openat.XXXXXX";
+
+  size_t dirbuflen = test_dir_len + sizeof (dir_name);
+  char *dirbuf = malloc (dirbuflen);
+  if (dirbuf == NULL)
+    {
+      puts ("out of memory");
+      exit (1);
+    }
+
+  snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
+  if (mkdtemp (dirbuf) == NULL)
+    {
+      puts ("cannot create temporary directory");
+      exit (1);
+    }
+
+  add_temp_file (dirbuf);
+
+  dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY);
+  if (dir_fd == -1)
+    {
+      puts ("cannot open directory");
+      exit (1);
+    }
+}
+
+
+static int
+do_test (void)
+{
+  /* fdopendir takes over the descriptor, make a copy.  */
+  int dupfd = dup (dir_fd);
+  if (dupfd == -1)
+    {
+      puts ("dup failed");
+      return 1;
+    }
+  if (lseek (dupfd, 0, SEEK_SET) != 0)
+    {
+      puts ("1st lseek failed");
+      return 1;
+    }
+
+  /* The directory should be empty safe the . and .. files.  */
+  DIR *dir = fdopendir (dupfd);
+  if (dir == NULL)
+    {
+      puts ("fdopendir failed");
+      return 1;
+    }
+  struct dirent64 *d;
+  while ((d = readdir64 (dir)) != NULL)
+    if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
+      {
+	printf ("temp directory contains file \"%s\"\n", d->d_name);
+	return 1;
+      }
+  closedir (dir);
+
+  /* Try to create a file.  */
+  int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
+  if (fd == -1)
+    {
+      puts ("file creation failed");
+      return 1;
+    }
+  write (fd, "hello", 5);
+  close (fd);
+  puts ("file created");
+
+  /* fdopendir takes over the descriptor, make a copy.  */
+  dupfd = dup (dir_fd);
+  if (dupfd == -1)
+    {
+      puts ("dup failed");
+      return 1;
+    }
+  if (lseek (dupfd, 0, SEEK_SET) != 0)
+    {
+      puts ("2nd lseek failed");
+      return 1;
+    }
+
+  /* The directory should be empty safe the . and .. files.  */
+  dir = fdopendir (dupfd);
+  if (dir == NULL)
+    {
+      puts ("fdopendir failed");
+      return 1;
+    }
+  bool seen_file = false;
+  while ((d = readdir64 (dir)) != NULL)
+    if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
+      {
+	if (strcmp (d->d_name, "some-file") != 0)
+	  {
+	    printf ("temp directory contains file \"%s\"\n", d->d_name);
+	    return 1;
+	  }
+
+	seen_file = true;
+      }
+  closedir (dir);
+
+  if (!seen_file)
+    {
+      puts ("file not created in correct directory");
+      return 1;
+    }
+
+  int cwdfd = open (".", O_RDONLY | O_DIRECTORY);
+  if (cwdfd == -1)
+    {
+      puts ("cannot get descriptor for cwd");
+      return 1;
+    }
+
+  if (fchdir (dir_fd) != 0)
+    {
+      puts ("1st fchdir failed");
+      return 1;
+    }
+
+  if (unlink ("some-file") != 0)
+    {
+      puts ("unlink failed");
+      return 1;
+    }
+
+  if (fchdir (cwdfd) != 0)
+    {
+      puts ("2nd fchdir failed");
+      return 1;
+    }
+
+  close (dir_fd);
+  close (cwdfd);
+
+  return 0;
+}