New file.

diff --git a/lib/fcntl-safer.h b/lib/fcntl-safer.h
new file mode 100644 (file)
index 0000000..1c119f0
--- /dev/null
+++ b/lib/fcntl-safer.h
@@ -0,0 +1,21 @@
+/* Invoke fcntl functions, 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.  */
+
+int open_safer (char const *, int, ...);

diff --git a/lib/open-safer.c b/lib/open-safer.c
new file mode 100644 (file)
index 0000000..ff7f45d
--- /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;
+}

diff --git a/m4/fcntl-safer.m4 b/m4/fcntl-safer.m4
new file mode 100644 (file)
index 0000000..1f9cd0b
--- /dev/null
+++ b/m4/fcntl-safer.m4
@@ -0,0 +1,29 @@
+# fcntl-safer.m4 serial 1
+
+# 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.
+
+AC_DEFUN([gl_FCNTL_SAFER],
+[
+  gl_PREREQ_OPEN_SAFER
+])
+
+# Prerequisites of lib/open-safer.c.
+AC_DEFUN([gl_PREREQ_OPEN_SAFER], [
+  AC_CHECK_HEADERS_ONCE(fcntl.h unistd.h)
+])