Updated

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

diff --git a/lib/save-cwd.c b/lib/save-cwd.c
index 272f742..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, 2004 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
@@ -51,68 +53,33 @@
    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 SunOS 4 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)
 {
-#if !HAVE_FCHDIR
-# undef fchdir
-# define fchdir(x) (abort (), 0)
-  bool have_working_fchdir = false;
-  bool fchdir_needs_testing = false;
-#elif (__sgi || __sun)
-  static bool have_working_fchdir = true;
-  bool fchdir_needs_testing = true;
-#else
-  bool have_working_fchdir = true;
-  bool fchdir_needs_testing = false;
-#endif
-
-  cwd->desc = -1;
   cwd->name = NULL;
 
-  if (have_working_fchdir)
+  cwd->desc = open (".", O_RDONLY);
+  if (cwd->desc < 0)
     {
-      cwd->desc = open (".", O_RDONLY);
+      cwd->desc = open (".", O_WRONLY);
       if (cwd->desc < 0)
        {
-         cwd->desc = open (".", O_WRONLY);
-         if (cwd->desc < 0)
-           {
-             cwd->name = xgetcwd ();
-             return cwd->name ? 0 : -1;
-           }
-       }
-
-      /* On SunOS 4 and IRIX 5.3, fchdir returns EINVAL when auditing
-        is enabled, so we have to fall back to chdir.  */
-      if (fchdir_needs_testing && fchdir (cwd->desc) != 0)
-       {
-         int saved_errno = errno;
-         close (cwd->desc);
-         cwd->desc = -1;
-         if (saved_errno != EINVAL)
-           {
-             errno = saved_errno;
-             return -1;
-           }
-         have_working_fchdir = false;
+         cwd->name = xgetcwd ();
+         return cwd->name ? 0 : -1;
        }
     }
 
-  if (!have_working_fchdir)
-    {
-      cwd->name = xgetcwd ();
-      if (cwd->name == NULL)
-       return -1;
-    }
   return 0;
 }