63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
|
/* Invoke dup, but avoid some glitches.
|
||
|
|
Copyright (C) 2001 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 <errno.h>
|
||
|
|
#ifndef errno
|
||
|
|
extern int errno;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if HAVE_FCNTL_H
|
||
|
|
# include <fcntl.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if HAVE_UNISTD_H
|
||
|
|
# include <unistd.h>
|
||
|
|
#endif
|
||
|
|
#ifndef STDERR_FILENO
|
||
|
|
# define STDERR_FILENO 2
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <unistd-safer.h>
|
||
|
|
|
||
|
|
/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
|
||
|
|
STDERR_FILENO. */
|
||
|
|
|
||
|
|
int
|
||
|
|
dup_safer (int fd)
|
||
|
|
{
|
||
|
|
#ifdef F_DUPFD
|
||
|
|
return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
|
||
|
|
#else
|
||
|
|
int f = dup (fd);
|
||
|
|
if (0 <= f && f <= STDERR_FILENO)
|
||
|
|
{
|
||
|
|
int f1 = dup_safer (f);
|
||
|
|
int e = errno;
|
||
|
|
close (f);
|
||
|
|
errno = e;
|
||
|
|
f = f1;
|
||
|
|
}
|
||
|
|
return f;
|
||
|
|
#endif
|
||
|
|
}
|