* io/Makefile (routines): Add fstatat, fstatat64, fxstatat, fxstatat64,

	fchownat, and unlinkat.
	(static-only-routines): Add fstatat and fstatat64.
	(tests): Add tst-unlinkat, tst-fstatat, tst-futimesat, tst-renameat,
	and tst-fchownat.
	* io/Versions [GLIBC_2.4]: Add fchownat, __fxstatat, __fxstatat64,
	and unlinkat.
	* io/fcntl.h: Define AT_FDCWD, AT_SYMLINK_NOFOLLOW, and AT_REMOVEDIR.
	* io/fstatat.c: New file.
	* io/fstatat64.c: New file.
	* io/sys/stat.h: Declare fstatat, fstatat64, __fxstatat, __fxstatat64
	and define fstatat and fstatat64 inline functions.
	* libio/stdio.h: Declare renameat.
	* misc/Makefile (routines): Add futimesat.
	* misc/Versions [GLIBC_2.4]: Add futimesat.
	* posix/unistd.h: Declare fchownat and unlinkat.
	* stdio-common/Makefile (routines): Add renameat.
	* stdio-common/Versions [GLIBC_2.4]: Add renameat.
	* sysdeps/generic/fchownat.c: New file.
	* sysdeps/generic/futimesat.c: New file.
	* sysdeps/generic/fxstatat.c: New file.
	* sysdeps/generic/fxstatat64.c: New file.
	* sysdeps/generic/renameat.c: New file.
	* sysdeps/generic/unlinkat.c: New file.
	* sysdeps/unix/sysv/linux/fchownat.c: New file.
	* sysdeps/unix/sysv/linux/futimesat.c: New file.
	* sysdeps/unix/sysv/linux/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/fxstatat64.c: New file.
	* sysdeps/unix/sysv/linux/renameat.c: New file.
	* sysdeps/unix/sysv/linux/unlinkat.c: New file.
	* sysdeps/unix/sysv/linux/alpha/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/i386/fchownat.c: New file.
	* sysdeps/unix/sysv/linux/i386/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/m68k/fchownat.c: New file.
	* sysdeps/unix/sysv/linux/m68k/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/powerpc/fchownat.c: New file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/s390/s390-32/fchownat.c: New file.
	* sysdeps/unix/sysv/linux/s390/s390-32/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/sh/fchownat.c: New file.
	* sysdeps/unix/sysv/linux/sh/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/sparc/sparc32/fchownat.c: New file.
	* sysdeps/unix/sysv/linux/sparc/sparc32/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/sparc/sparc64/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/wordsize-64/fxstatat.c: New file.
	* sysdeps/unix/sysv/linux/wordsize-64/fxstatat64.c: New file.
	* time/sys/time.h: Declare futimesat.
	* include/fcntl.h: Declare __atfct_seterrno.
	* sysdeps/unix/sysv/linux/openat.c (__atfct_seterrno): New function.
	Split out from openat code and called.
	(do_test): Allow openat to fail with ENOSYS.  Handle AT_FDCWD.
	* sysdeps/generic/openat.c: Handle AT_FDCWD.
	* sysdeps/generic/openat64.c: Likewise.
	* io/tst-unlinkat.c: New file.
	* io/tst-fstatat.c: New file.
	* io/tst-futimesat.c: New file.
	* io/tst-renameat.c: New file.
	* io/tst-fchownat.c: New file.
	* io/tst-openat.c: Don't fail if openat is not implemented.

	* sysdeps/unix/sysv/linux/powerpc/chown.c: Don't provide backward
	compatibility code if new kernel is guaranteed.

	* time/sys/time.h: Add a few nonnull attributes.

3 files changed, 279 insertions, 67 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/chown.c b/sysdeps/unix/sysv/linux/powerpc/chown.c
index 4b283e720c..fdcbd3683a 100644
--- a/sysdeps/unix/sysv/linux/powerpc/chown.c
+++ b/sysdeps/unix/sysv/linux/powerpc/chown.c
@@ -1,5 +1,5 @@
 /* chown() compatibility.
-   Copyright (C) 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
+   Copyright (C) 1998, 2000, 2002, 2003, 2005 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
@@ -24,6 +24,8 @@
 #include <sysdep.h>
 #include <stdlib.h>
 
+#include <kernel-features.h>
+
 /*
   In Linux 2.1.x the chown functions have been changed.  A new function lchown
   was introduced.  The new chown now follows symlinks - the old chown and the
@@ -34,58 +36,61 @@
 int
 __chown (const char *file, uid_t owner, gid_t group)
 {
-   int err;
-   int old_errno;
-   char link[PATH_MAX+2];
-   char path[2*PATH_MAX+4];
-   int loopct;
-   size_t filelen;
-   static int libc_old_chown = 0 /* -1=old linux, 1=new linux, 0=unknown */;
-
-   if (libc_old_chown == 1)
-     return INLINE_SYSCALL (chown, 3, __ptrvalue (file), owner, group);
-
-   old_errno = errno;
-
-#ifdef __NR_lchown
-   if (libc_old_chown == 0)
-     {
-       err = INLINE_SYSCALL (chown, 3, __ptrvalue (file), owner, group);
-       if (err != -1 || errno != ENOSYS)
-	 {
-	   libc_old_chown = 1;
-	   return err;
-	 }
-       libc_old_chown = -1;
-     }
-#endif
-
-   err = __readlink (file, link, PATH_MAX+1);
-   if (err == -1)
-     {
-       errno = old_errno;
-       return __lchown(file, owner, group);
-     }
-
-   filelen = strlen (file) + 1;
-   if (filelen > sizeof(path))
-     {
-       errno = ENAMETOOLONG;
-       return -1;
-     }
-   memcpy (path, file, filelen);
-
-   /* 'The system has an arbitrary limit...'  In practise, we'll hit
-      ENAMETOOLONG before this, usually.  */
-   for (loopct = 0; loopct < 128; loopct++)
-   {
-     size_t linklen;
-
-     if (err >= PATH_MAX+1)
-       {
-	 errno = ENAMETOOLONG;
-	 return -1;
-       }
+#if __ASSUME_LCHOWN_SYSCALL
+  return INLINE_SYSCALL (chown, 3, file, owner, group);
+#else
+  int err;
+  int old_errno;
+  char link[PATH_MAX + 2];
+  char path[2 * PATH_MAX + 4];
+  int loopct;
+  size_t filelen;
+  static int libc_old_chown = 0 /* -1=old linux, 1=new linux, 0=unknown */;
+
+  if (libc_old_chown == 1)
+    return INLINE_SYSCALL (chown, 3, __ptrvalue (file), owner, group);
+
+  old_errno = errno;
+
+# ifdef __NR_lchown
+  if (libc_old_chown == 0)
+    {
+      err = INLINE_SYSCALL (chown, 3, __ptrvalue (file), owner, group);
+      if (err != -1 || errno != ENOSYS)
+	{
+	  libc_old_chown = 1;
+	  return err;
+	}
+      libc_old_chown = -1;
+    }
+# endif
+
+  err = __readlink (file, link, PATH_MAX + 1);
+  if (err == -1)
+    {
+      __set_errno (old_errno);
+      return __lchown (file, owner, group);
+    }
+
+  filelen = strlen (file) + 1;
+  if (filelen > sizeof (path))
+    {
+      __set_errno (ENAMETOOLONG);
+      return -1;
+    }
+  memcpy (path, file, filelen);
+
+  /* 'The system has an arbitrary limit...'  In practise, we'll hit
+     ENAMETOOLONG before this, usually.  */
+  for (loopct = 0; loopct < 128; ++loopct)
+    {
+      size_t linklen;
+
+      if (err >= PATH_MAX + 1)
+	{
+	  __set_errno (ENAMETOOLONG);
+	  return -1;
+	}
 
       link[err] = 0;  /* Null-terminate string, just-in-case.  */
 
@@ -97,28 +102,29 @@ __chown (const char *file, uid_t owner, gid_t group)
 	{
 	  filelen = strlen (path);
 
-	  while (filelen > 1 && path[filelen-1] == '/')
-	    filelen--;
-	  while (filelen > 0 && path[filelen-1] != '/')
-	    filelen--;
-	  if (filelen + linklen > sizeof(path))
+	  while (filelen > 1 && path[filelen - 1] == '/')
+	    --filelen;
+	  while (filelen > 0 && path[filelen - 1] != '/')
+	    --filelen;
+	  if (filelen + linklen > sizeof (path))
 	    {
 	      errno = ENAMETOOLONG;
 	      return -1;
 	    }
-	  memcpy (path+filelen, link, linklen);
+	  memcpy (path + filelen, link, linklen);
 	}
 
-      err = __readlink(path, link, PATH_MAX+1);
+      err = __readlink (path, link, PATH_MAX + 1);
 
       if (err == -1)
-      {
-	errno = old_errno;
-	return __lchown(path, owner, group);
-      }
-   }
-   errno = ELOOP;
-   return -1;
+	{
+	  __set_errno (old_errno);
+	  return __lchown (path, owner, group);
+	}
+    }
+  __set_errno (ELOOP);
+  return -1;
+#endif
 }
 libc_hidden_def (__chown)
 
diff --git a/sysdeps/unix/sysv/linux/powerpc/fchownat.c b/sysdeps/unix/sysv/linux/powerpc/fchownat.c
new file mode 100644
index 0000000000..1fbae5c448
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/fchownat.c
@@ -0,0 +1,205 @@
+/* Copyright (C) 2005 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+#include <sysdep.h>
+#include <stdlib.h>
+
+#include <kernel-features.h>
+
+/*
+  In Linux 2.1.x the chown functions have been changed.  A new function lchown
+  was introduced.  The new chown now follows symlinks - the old chown and the
+  new lchown do not follow symlinks.
+  This file emulates chown() under the old kernels.
+*/
+
+int
+fchownat (int fd, const char *file, uid_t owner, gid_t group, int flag)
+{
+  if (flag & ~AT_SYMLINK_NOFOLLOW)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+  char *buf = NULL;
+
+  if (fd != AT_FDCWD && file[0] != '/')
+    {
+      size_t filelen = strlen (file);
+      static const char procfd[] = "/proc/self/fd/%d/%s";
+      /* Buffer for the path name we are going to use.  It consists of
+	 - the string /proc/self/fd/
+	 - the file descriptor number
+	 - the file name provided.
+	 The final NUL is included in the sizeof.   A bit of overhead
+	 due to the format elements compensates for possible negative
+	 numbers.  */
+      size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
+      buf = alloca (buflen);
+
+      __snprintf (buf, buflen, procfd, fd, file);
+      file = buf;
+    }
+
+  int result;
+  INTERNAL_SYSCALL_DECL (err);
+
+#if __ASSUME_LCHOWN_SYSCALL
+  if (flag & AT_SYMLINK_NOFOLLOW)
+    result = INTERNAL_SYSCALL (lchown, err, 3, file, owner, group);
+  else
+    result = INTERNAL_SYSCALL (chown, err, 3, file, owner, group);
+#else
+  char link[PATH_MAX + 2];
+  char path[2 * PATH_MAX + 4];
+  int loopct;
+  size_t filelen;
+  static int libc_old_chown = 0 /* -1=old linux, 1=new linux, 0=unknown */;
+
+  if (libc_old_chown == 1)
+    {
+      if (flag & AT_SYMLINK_NOFOLLOW)
+	result = INTERNAL_SYSCALL (lchown, err, 3, __ptrvalue (file), owner,
+				   group);
+      else
+	result = INTERNAL_SYSCALL (chown, err, 3, __ptrvalue (file), owner,
+				   group);
+      goto out;
+    }
+
+# ifdef __NR_lchown
+  if (flag & AT_SYMLINK_NOFOLLOW)
+    {
+      result = INTERNAL_SYSCALL (lchown, err, 3, __ptrvalue (file), owner,
+				 group);
+      goto out;
+    }
+
+  if (libc_old_chown == 0)
+    {
+      result = INTERNAL_SYSCALL (chown, err, 3, __ptrvalue (file), owner,
+				 group);
+      if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
+	return result;
+      if (INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS)
+	{
+	  libc_old_chown = 1;
+	  goto fail;
+	}
+      libc_old_chown = -1;
+    }
+# else
+  if (flag & AT_SYMLINK_NOFOLLOW)
+    {
+      result = INTERNAL_SYSCALL (chown, err, 3, __ptrvalue (file), owner,
+				 group);
+      goto out;
+    }
+# endif
+
+  result = __readlink (file, link, PATH_MAX + 1);
+  if (result == -1)
+    {
+# ifdef __NR_lchown
+      result = INTERNAL_SYSCALL (lchown, err, 3, __ptrvalue (file), owner,
+				 group);
+# else
+      result = INTERNAL_SYSCALL (chown, err, 3, __ptrvalue (file), owner,
+				 group);
+# endif
+      goto out;
+    }
+
+  filelen = strlen (file) + 1;
+  if (filelen > sizeof (path))
+    {
+      errno = ENAMETOOLONG;
+      return -1;
+    }
+  memcpy (path, file, filelen);
+
+  /* 'The system has an arbitrary limit...'  In practise, we'll hit
+     ENAMETOOLONG before this, usually.  */
+  for (loopct = 0; loopct < 128; ++loopct)
+    {
+      size_t linklen;
+
+      if (result >= PATH_MAX + 1)
+	{
+	  errno = ENAMETOOLONG;
+	  return -1;
+	}
+
+      link[result] = 0;  /* Null-terminate string, just-in-case.  */
+
+      linklen = strlen (link) + 1;
+
+      if (link[0] == '/')
+	memcpy (path, link, linklen);
+      else
+	{
+	  filelen = strlen (path);
+
+	  while (filelen > 1 && path[filelen - 1] == '/')
+	    --filelen;
+	  while (filelen > 0 && path[filelen - 1] != '/')
+	    --filelen;
+	  if (filelen + linklen > sizeof (path))
+	    {
+	      errno = ENAMETOOLONG;
+	      return -1;
+	    }
+	  memcpy (path + filelen, link, linklen);
+	}
+
+      result = __readlink (path, link, PATH_MAX + 1);
+
+      if (result == -1)
+	{
+# ifdef __NR_lchown
+	  result = INTERNAL_SYSCALL (lchown, err, 3, path, owner, group);
+# else
+	  result = INTERNAL_SYSCALL (chown, err, 3, path, owner, group);
+# endif
+	  goto out;
+	}
+    }
+  __set_errno (ELOOP);
+  return -1;
+
+ out:
+#endif
+
+  if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0))
+    {
+#if !__ASSUME_LCHOWN_SYSCALL
+    fail:
+#endif
+      __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf);
+      result = -1;
+    }
+
+  return result;
+}
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fxstatat.c b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fxstatat.c
new file mode 100644
index 0000000000..0f8b3135d8
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fxstatat.c
@@ -0,0 +1 @@
+#include <sysdeps/unix/sysv/linux/i386/fxstatat.c>