94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/*-
|
|
* Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Portions of this software were developed under sponsorship from Snow
|
|
* B.V., the Netherlands.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
__FBSDID("$FreeBSD$");
|
|
#endif /* not lint */
|
|
|
|
#include "namespace.h"
|
|
#include <sys/param.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
#include <errno.h>
|
|
#include <paths.h>
|
|
#include <stdlib.h>
|
|
#include "un-namespace.h"
|
|
|
|
/*
|
|
* __isptmaster(): return whether the file descriptor refers to a
|
|
* pseudo-terminal master device.
|
|
*/
|
|
static int
|
|
__isptmaster(int fildes)
|
|
{
|
|
|
|
if (_ioctl(fildes, TIOCPTMASTER) == 0)
|
|
return (0);
|
|
|
|
if (errno != EBADF)
|
|
errno = EINVAL;
|
|
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* In our implementation, grantpt() and unlockpt() don't actually have
|
|
* any use, because PTY's are created on the fly and already have proper
|
|
* permissions upon creation.
|
|
*
|
|
* Just make sure `fildes' actually points to a real PTY master device.
|
|
*/
|
|
__strong_reference(__isptmaster, grantpt);
|
|
__strong_reference(__isptmaster, unlockpt);
|
|
|
|
/*
|
|
* ptsname(): return the pathname of the slave pseudo-terminal device
|
|
* associated with the specified master.
|
|
*/
|
|
char *
|
|
ptsname(int fildes)
|
|
{
|
|
static char pt_slave[sizeof _PATH_DEV + SPECNAMELEN] = _PATH_DEV;
|
|
char *ret = NULL;
|
|
int sverrno = errno;
|
|
|
|
/* Make sure fildes points to a master device. */
|
|
if (__isptmaster(fildes) != 0)
|
|
goto done;
|
|
|
|
if (fdevname_r(fildes, pt_slave + (sizeof _PATH_DEV - 1),
|
|
sizeof pt_slave - (sizeof _PATH_DEV - 1)) != NULL)
|
|
ret = pt_slave;
|
|
|
|
done: /* Make sure ptsname() does not overwrite errno. */
|
|
errno = sverrno;
|
|
return (ret);
|
|
}
|