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/* 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;
}
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