1 files changed, 127 insertions, 0 deletions
diff --git a/lib/openat.h b/lib/openat.h
new file mode 100644
index 0000000..f8333f0
--- /dev/null
+++ b/lib/openat.h
@@ -0,0 +1,127 @@
+/* provide a replacement openat function
+   Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* written by Jim Meyering */
+
+#include <fcntl.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stdbool.h>
+
+#ifndef __attribute__
+# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
+#  define __attribute__(x) /* empty */
+# endif
+#endif
+
+#ifndef ATTRIBUTE_NORETURN
+# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
+#endif
+
+/* Work around a bug in Solaris 9 and 10: AT_FDCWD is positive.  Its
+   value exceeds INT_MAX, so its use as an int doesn't conform to the
+   C standard, and GCC and Sun C complain in some cases.  If the bug
+   is present, undef AT_FDCWD here, so it can be redefined below.  */
+#if 0 < AT_FDCWD && AT_FDCWD == 0xffd19553
+# undef AT_FDCWD
+#endif
+
+/* Use the same bit pattern as Solaris 9, but with the proper
+   signedness.  The bit pattern is important, in case this actually is
+   Solaris with the above workaround.  */
+#ifndef AT_FDCWD
+# define AT_FDCWD (-3041965)
+#endif
+
+/* Use the same values as Solaris 9.  This shouldn't matter, but
+   there's no real reason to differ.  */
+#ifndef AT_SYMLINK_NOFOLLOW
+# define AT_SYMLINK_NOFOLLOW 4096
+# define AT_REMOVEDIR 1
+#endif
+
+#ifdef __OPENAT_PREFIX
+
+# undef openat
+# define __OPENAT_CONCAT(x, y) x ## y
+# define __OPENAT_XCONCAT(x, y) __OPENAT_CONCAT (x, y)
+# define __OPENAT_ID(y) __OPENAT_XCONCAT (__OPENAT_PREFIX, y)
+# define openat __OPENAT_ID (openat)
+int openat (int fd, char const *file, int flags, /* mode_t mode */ ...);
+int openat_permissive (int fd, char const *file, int flags, mode_t mode,
+		       int *cwd_errno);
+# if ! HAVE_FDOPENDIR
+#  define fdopendir __OPENAT_ID (fdopendir)
+# endif
+DIR *fdopendir (int fd);
+# define fstatat __OPENAT_ID (fstatat)
+int fstatat (int fd, char const *file, struct stat *st, int flag);
+# define unlinkat __OPENAT_ID (unlinkat)
+int unlinkat (int fd, char const *file, int flag);
+bool openat_needs_fchdir (void);
+
+#else
+
+# define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \
+    openat (Fd, File, Flags, Mode)
+# define openat_needs_fchdir() false
+
+#endif
+
+#if HAVE_OPENAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
+int rpl_fstatat (int fd, char const *file, struct stat *st, int flag);
+# if !COMPILING_FSTATAT
+#  undef fstatat
+#  define fstatat rpl_fstatat
+# endif
+#endif
+
+int mkdirat (int fd, char const *file, mode_t mode);
+void openat_restore_fail (int) ATTRIBUTE_NORETURN;
+void openat_save_fail (int) ATTRIBUTE_NORETURN;
+int fchmodat (int fd, char const *file, mode_t mode, int flag);
+int fchownat (int fd, char const *file, uid_t owner, gid_t group, int flag);
+
+/* Using these function names makes application code
+   slightly more readable than it would be with
+   fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW).  */
+static inline int
+chownat (int fd, char const *file, uid_t owner, gid_t group)
+{
+  return fchownat (fd, file, owner, group, 0);
+}
+
+static inline int
+lchownat (int fd, char const *file, uid_t owner, gid_t group)
+{
+  return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW);
+}
+
+static inline int
+chmodat (int fd, char const *file, mode_t mode)
+{
+  return fchmodat (fd, file, mode, 0);
+}
+
+static inline int
+lchmodat (int fd, char const *file, mode_t mode)
+{
+  return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW);
+}