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+/* Return a safer copy of a file descriptor.
+
+ Copyright (C) 2005-2006, 2009-2015 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>
+
+/* 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;
+}