Updated

[gnulib.git] / lib / save-cwd.c

diff --git a/lib/save-cwd.c b/lib/save-cwd.c
index 068ff0a..596b78c 100644 (file)
--- a/lib/save-cwd.c
+++ b/lib/save-cwd.c
@@ -1,5 +1,7 @@
 /* save-cwd.c -- Save and restore current working directory.
-   Copyright (C) 1995, 1997, 1998, 2003 Free Software Foundation, Inc.
+
+   Copyright (C) 1995, 1997, 1998, 2003, 2004, 2005 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
@@ -21,11 +23,11 @@
 # include "config.h"
 #endif
 
-#include <stdio.h>
+#include "save-cwd.h"
 
-#ifdef STDC_HEADERS
-# include <stdlib.h>
-#endif
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 #if HAVE_UNISTD_H
 # include <unistd.h>
@@ -38,15 +40,8 @@
 #endif
 
 #include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
-
-#ifndef O_DIRECTORY
-# define O_DIRECTORY 0
-#endif
 
-#include "save-cwd.h"
+#include "chdir-long.h"
 #include "xgetcwd.h"
 
 /* Record the location of the current working directory in CWD so that
@@ -58,76 +53,47 @@ extern int errno;
    closed;  return non-zero -- in that case, free_cwd need not be
    called, but doing so is ok.  Otherwise, return zero.
 
-   The `raison d'etre' for this interface is that some systems lack
-   support for fchdir, and getcwd is not robust or as efficient.
+   The `raison d'etre' for this interface is that the working directory
+   is sometimes inaccessible, and getcwd is not robust or as efficient.
    So, we prefer to use the open/fchdir approach, but fall back on
-   getcwd if necessary.  Some systems lack fchdir altogether: OS/2,
-   Cygwin (as of March 2003), SCO Xenix.  At least SunOS4 and Irix 5.3
-   provide the function, yet it doesn't work for partitions on which
-   auditing is enabled.  */
+   getcwd if necessary.
+
+   Some systems lack fchdir altogether: e.g., OS/2, pre-2001 Cygwin,
+   SCO Xenix.  Also, SunOS 4 and Irix 5.3 provide the function, yet it
+   doesn't work for partitions on which auditing is enabled.  If
+   you're still using an obsolete system with these problems, please
+   send email to the maintainer of this code.  */
 
 int
 save_cwd (struct saved_cwd *cwd)
 {
-  static int have_working_fchdir = 1;
-
-  cwd->desc = -1;
   cwd->name = NULL;
 
-  if (have_working_fchdir)
+  cwd->desc = open (".", O_RDONLY);
+  if (cwd->desc < 0)
     {
-#if HAVE_FCHDIR
-      cwd->desc = open (".", O_RDONLY | O_DIRECTORY);
+      cwd->desc = open (".", O_WRONLY);
       if (cwd->desc < 0)
-       return 1;
-
-# if __sun__ || sun
-      /* On SunOS 4 and IRIX 5.3, fchdir returns EINVAL when auditing
-        is enabled, so we have to fall back to chdir.  */
-      if (fchdir (cwd->desc))
        {
-         if (errno == EINVAL)
-           {
-             close (cwd->desc);
-             cwd->desc = -1;
-             have_working_fchdir = 0;
-           }
-         else
-           {
-             int saved_errno = errno;
-             close (cwd->desc);
-             cwd->desc = -1;
-             errno = saved_errno;
-             return 1;
-           }
+         cwd->name = xgetcwd ();
+         return cwd->name ? 0 : -1;
        }
-# endif /* __sun__ || sun */
-#else
-# define fchdir(x) (abort (), 0)
-      have_working_fchdir = 0;
-#endif
     }
 
-  if (!have_working_fchdir)
-    {
-      cwd->name = xgetcwd ();
-      if (cwd->name == NULL)
-       return 1;
-    }
   return 0;
 }
 
 /* Change to recorded location, CWD, in directory hierarchy.
-   Upon failure, return nonzero (errno is set by chdir or fchdir).
+   Upon failure, return -1 (errno is set by chdir or fchdir).
    Upon success, return zero.  */
 
 int
 restore_cwd (const struct saved_cwd *cwd)
 {
   if (0 <= cwd->desc)
-    return fchdir (cwd->desc) < 0;
+    return fchdir (cwd->desc);
   else
-    return chdir (cwd->name) < 0;
+    return chdir_long (cwd->name);
 }
 
 void