New file.

1 files changed, 75 insertions, 0 deletions

diff --git a/lib/open-safer.c b/lib/open-safer.c
new file mode 100644
index 000000000..ff7f45d44
--- /dev/null
+++ b/lib/open-safer.c
@@ -0,0 +1,75 @@
+/* Invoke open, but avoid some glitches.
+
+   Copyright (C) 2004 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 2, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by Paul Eggert.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <fcntl-safer.h>
+
+#include <unistd-safer.h>
+
+#include <errno.h>
+#include <stdarg.h>
+
+#if HAVE_FCNTL_H
+# include <fcntl.h>
+#endif
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#ifndef STDERR_FILENO
+# define STDERR_FILENO 2
+#endif
+
+/* Like open, but do not return STDIN_FILENO, STDOUT_FILENO, or
+   STDERR_FILENO.  */
+
+int
+open_safer (char const *file, int oflag, ...)
+{
+  int fd;
+  mode_t mode = 0;
+
+  if (oflag & O_CREAT)
+    {
+      va_list args;
+      va_start (args, oflag);
+      if (sizeof (int) <= sizeof (mode_t))
+	mode = va_arg (args, mode_t);
+      else
+	mode = va_arg (args, int);
+      va_end (args);
+    }
+
+  fd = open (file, oflag, mode);
+
+  if (0 <= fd && fd <= STDERR_FILENO)
+    {
+      int f = dup_safer (fd);
+      int e = errno;
+      close (fd);
+      errno = e;
+      fd = f;
+    }
+
+  return fd;
+}