+
−/* 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
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−   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,
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−   but WITHOUT ANY WARRANTY; without even the implied warranty of
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−   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>
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−
+
−#include <unistd-safer.h>
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−
+
−#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
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−# define STDERR_FILENO 2
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−#endif
+
−
+
−/* Like open, but do not return STDIN_FILENO, STDOUT_FILENO, or
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−   STDERR_FILENO.  */
+
−
+
−int
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−open_safer (char const *file, int oflag, ...)
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−{
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−  int fd;
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−  mode_t mode = 0;
+
−
+
−  if (oflag & O_CREAT)
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−    {
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−      va_list args;
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−      va_start (args, oflag);
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−      if (sizeof (int) <= sizeof (mode_t))
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−	mode = va_arg (args, mode_t);
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−      else
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−	mode = va_arg (args, int);
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−      va_end (args);
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−    }
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−
+
−  fd = open (file, oflag, mode);
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−
+
−  if (0 <= fd && fd <= STDERR_FILENO)
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−    {
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−      int f = dup_safer (fd);
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−      int e = errno;
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−      close (fd);
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−      errno = e;
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−      fd = f;
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−    }
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−
+
−  return fd;
+
−}