mirror of
https://github.com/coreutils/coreutils.git
synced 2024-12-14 04:18:48 +08:00
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/* 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;
|
|
}
|