Index: bison/src/bison/2.4.1/bison-2.4.1-src/lib/fd-safer.c |
=================================================================== |
--- bison/src/bison/2.4.1/bison-2.4.1-src/lib/fd-safer.c (revision 0) |
+++ bison/src/bison/2.4.1/bison-2.4.1-src/lib/fd-safer.c (revision 0) |
@@ -0,0 +1,56 @@ |
+/* Return a safer copy of a file descriptor. |
+ |
+ Copyright (C) 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 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, see <http://www.gnu.org/licenses/>. */ |
+ |
+/* Written by Paul Eggert. */ |
+ |
+#include <config.h> |
+ |
+#include "unistd-safer.h" |
+ |
+#include <errno.h> |
+ |
+#include <unistd.h> |
+#ifndef STDIN_FILENO |
+# define STDIN_FILENO 0 |
+#endif |
+#ifndef STDERR_FILENO |
+# define STDERR_FILENO 2 |
+#endif |
+ |
+/* Return FD, unless FD would be a copy of standard input, output, or |
+ error; in that case, return a duplicate of FD, closing FD. On |
+ failure to duplicate, close FD, set errno, and return -1. Preserve |
+ errno if FD is negative, so that the caller can always inspect |
+ errno when the returned value is negative. |
+ |
+ This function is usefully wrapped around functions that return file |
+ descriptors, e.g., fd_safer (open ("file", O_RDONLY)). */ |
+ |
+int |
+fd_safer (int fd) |
+{ |
+ if (STDIN_FILENO <= fd && fd <= STDERR_FILENO) |
+ { |
+ int f = dup_safer (fd); |
+ int e = errno; |
+ close (fd); |
+ errno = e; |
+ fd = f; |
+ } |
+ |
+ return fd; |
+} |
Property changes on: bison\src\bison\2.4.1\bison-2.4.1-src\lib\fd-safer.c |
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Added: svn:eol-style |
+ LF |