gems-kernel/source/THIRDPARTY/xnu/bsd/kern/tty_pty.c
2024-06-03 11:29:39 -05:00

182 lines
5.7 KiB
C

/*
* Copyright (c) 1997-2013 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
*/
/*
* Pseudo-teletype Driver
* (Actually two drivers, requiring two entries in 'cdevsw')
*/
#include "pty.h" /* XXX */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/tty.h>
#include <sys/conf.h>
#include <sys/file_internal.h>
#include <sys/uio_internal.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/user.h>
#include <sys/signalvar.h>
#if CONFIG_MACF
#include <security/mac_framework.h>
#endif
#include "tty_dev.h"
#if NPTY == 1
#undef NPTY
#define NPTY 32 /* crude XXX */
#warning You have only one pty defined, redefining to 32.
#endif
/*
* pts == /dev/tty[pqrsPQRS][0-9a-v]
* ptc == /dev/pty[pqrsPQRS][0-9a-v]
*/
static struct ptmx_ioctl pt_ioctl[NPTY];
int pty_init(int n_ptys);
#ifndef DEVFS
int
pty_init(__unused int n_ptys)
{
return 0;
}
#else // DEVFS
#include <miscfs/devfs/devfs.h>
#define START_CHAR 'p'
#define HEX_BASE 16
static struct tty_dev_t _pty_driver;
static struct ptmx_ioctl *
pty_get_ioctl(int minor, int open_flag)
{
if (minor >= NPTY) {
return NULL;
}
struct ptmx_ioctl *pti = &pt_ioctl[minor];
if (open_flag & (PF_OPEN_M | PF_OPEN_S)) {
if (!pti->pt_tty) {
pti->pt_tty = ttymalloc();
}
if (!pti->pt_tty) {
return NULL;
}
}
return pti;
}
static int
pty_get_name(int minor, char *buffer, size_t size)
{
return snprintf(buffer, size, "/dev/tty%c%x",
START_CHAR + (minor / HEX_BASE),
minor % HEX_BASE);
}
int
pty_init(int n_ptys)
{
int i;
int j;
n_ptys = min(n_ptys, NPTY); /* clamp to avoid pt_ioctl overflow */
/* create the pseudo tty device nodes */
for (j = 0; j < 10; j++) {
for (i = 0; i < HEX_BASE; i++) {
int m = j * HEX_BASE + i;
if (m >= n_ptys) {
goto done;
}
pt_ioctl[m].pt_devhandle = devfs_make_node(makedev(PTS_MAJOR, m),
DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666,
"tty%c%x", j + START_CHAR, i);
(void)devfs_make_node(makedev(PTC_MAJOR, m),
DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666,
"pty%c%x", j + START_CHAR, i);
}
}
done:
_pty_driver.primary = PTC_MAJOR;
_pty_driver.replica = PTS_MAJOR;
_pty_driver.open_reset = 1;
_pty_driver.open = &pty_get_ioctl;
_pty_driver.name = &pty_get_name;
tty_dev_register(&_pty_driver);
if (cdevsw_setkqueueok(PTC_MAJOR, &cdevsw[PTC_MAJOR], CDEVSW_IS_PTC) == -1) {
panic("Can't mark ptc as kqueue ok");
}
if (cdevsw_setkqueueok(PTS_MAJOR, &cdevsw[PTS_MAJOR], CDEVSW_IS_PTS) == -1) {
panic("Can't mark pts as kqueue ok");
}
return 0;
}
#endif // DEVFS