X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fgetcwd.c;h=a185ef3c6b7cc7eee0b871f570fa0aaa27f8030f;hb=57fdfd3f8ec62b105c53bcdf6f127c35c7fe7391;hp=f13da4dcc69feda0ad56c88cd5651a3c7fcd6b25;hpb=854ebf64dc7dae95a43a4e139e075156d2add805;p=pspp

diff --git a/lib/getcwd.c b/lib/getcwd.c
index f13da4dcc6..a185ef3c6b 100644
--- a/lib/getcwd.c
+++ b/lib/getcwd.c
@@ -1,24 +1,24 @@
-/* Copyright (C) 1991,92,93,94,95,96,97,98,99,2004,2005,2006 Free Software
+/* Copyright (C) 1991,92,93,94,95,96,97,98,99,2004,2005,2006,2007 Free Software
    Foundation, Inc.
    This file is part of the GNU C Library.
 
-   This program is free software; you can redistribute it and/or modify
+   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.
+   the Free Software Foundation; either version 3 of the License, 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.  */
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #if !_LIBC
 # include <config.h>
-# include "getcwd.h"
+# include <unistd.h>
+# include "dirfd.h"
 #endif
 
 #include <errno.h>
@@ -49,8 +49,6 @@
 # ifndef mempcpy
 #  define mempcpy __mempcpy
 # endif
-#else
-# include "mempcpy.h"
 #endif
 
 #include <limits.h>
@@ -142,13 +140,18 @@ __getcwd (char *buf, size_t size)
   size_t allocated = size;
   size_t used;
 
-#if HAVE_PARTLY_WORKING_GETCWD && !defined AT_FDCWD
+#if HAVE_PARTLY_WORKING_GETCWD
   /* The system getcwd works, except it sometimes fails when it
      shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.  If
      AT_FDCWD is not defined, the algorithm below is O(N**2) and this
      is much slower than the system getcwd (at least on GNU/Linux).
      So trust the system getcwd's results unless they look
-     suspicious.  */
+     suspicious.
+
+     Use the system getcwd even if we have openat support, since the
+     system getcwd works even when a parent is unreadable, while the
+     openat-based approach does not.  */
+
 # undef getcwd
   dir = getcwd (buf, size);
   if (dir || (errno != ERANGE && !is_ENAMETOOLONG (errno) && errno != ENOENT))
@@ -231,6 +234,8 @@ __getcwd (char *buf, size_t size)
       dirstream = fdopendir (fd);
       if (dirstream == NULL)
 	goto lose;
+      /* Reset fd.  It may have been closed by fdopendir.  */
+      fd = dirfd (dirstream);
       fd_needs_closing = false;
 #else
       dirstream = __opendir (dotlist);
@@ -385,7 +390,7 @@ __getcwd (char *buf, size_t size)
   used = dir + allocated - dirp;
   memmove (dir, dirp, used);
 
-  if (buf == NULL && size == 0)
+  if (size == 0)
     /* Ensure that the buffer is only as large as necessary.  */
     buf = realloc (dir, used);