1/* 2 * Copyright (c) 1997-2013 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * Copyright (c) 1982, 1986, 1989, 1993 30 * The Regents of the University of California. All rights reserved. 31 * 32 * Redistribution and use in source and binary forms, with or without 33 * modification, are permitted provided that the following conditions 34 * are met: 35 * 1. Redistributions of source code must retain the above copyright 36 * notice, this list of conditions and the following disclaimer. 37 * 2. Redistributions in binary form must reproduce the above copyright 38 * notice, this list of conditions and the following disclaimer in the 39 * documentation and/or other materials provided with the distribution. 40 * 3. All advertising materials mentioning features or use of this software 41 * must display the following acknowledgement: 42 * This product includes software developed by the University of 43 * California, Berkeley and its contributors. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 61 */ 62 63/* 64 * Pseudo-teletype Driver 65 * (Actually two drivers, requiring two entries in 'cdevsw') 66 */ 67#include "pty.h" /* XXX */ 68 69#include <sys/param.h> 70#include <sys/systm.h> 71#include <sys/ioctl.h> 72#include <sys/proc_internal.h> 73#include <sys/kauth.h> 74#include <sys/tty.h> 75#include <sys/conf.h> 76#include <sys/file_internal.h> 77#include <sys/uio_internal.h> 78#include <sys/kernel.h> 79#include <sys/vnode.h> 80#include <sys/user.h> 81#include <sys/signalvar.h> 82 83#if CONFIG_MACF 84#include <security/mac_framework.h> 85#endif 86 87#include "tty_dev.h" 88 89#if NPTY == 1 90#undef NPTY 91#define NPTY 32 /* crude XXX */ 92#warning You have only one pty defined, redefining to 32. 93#endif 94 95#define PTY_MAJOR 5 96#define TTY_MAJOR 4 97 98/* 99 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 100 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 101 */ 102static struct ptmx_ioctl pt_ioctl[NPTY]; 103 104int pty_init(int n_ptys); 105 106#ifndef DEVFS 107int 108pty_init(__unused int n_ptys) 109{ 110 return 0; 111} 112#else // DEVFS 113#include <miscfs/devfs/devfs.h> 114#define START_CHAR 'p' 115#define HEX_BASE 16 116 117static struct tty_dev_t _pty_driver; 118 119static struct ptmx_ioctl * 120pty_get_ioctl(int minor, int open_flag) 121{ 122 if (minor >= NPTY) { 123 return NULL; 124 } 125 struct ptmx_ioctl *pti = &pt_ioctl[minor]; 126 if (open_flag & (PF_OPEN_M|PF_OPEN_S)) { 127 if (!pti->pt_tty) { 128 pti->pt_tty = ttymalloc(); 129 } 130 if (!pti->pt_tty) { 131 return NULL; 132 } 133 } 134 return pti; 135} 136 137static int 138pty_get_name(int minor, char *buffer, size_t size) 139{ 140 return snprintf(buffer, size, "/dev/tty%c%x", 141 START_CHAR + (minor / HEX_BASE), 142 minor % HEX_BASE); 143} 144 145int 146pty_init(int n_ptys) 147{ 148 int i; 149 int j; 150 151 /* create the pseudo tty device nodes */ 152 for (j = 0; j < 10; j++) { 153 for (i = 0; i < HEX_BASE; i++) { 154 int m = j * HEX_BASE + i; 155 if (m == n_ptys) 156 goto done; 157 pt_ioctl[m].pt_devhandle = devfs_make_node(makedev(TTY_MAJOR, m), 158 DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666, 159 "tty%c%x", j + START_CHAR, i); 160 (void)devfs_make_node(makedev(PTY_MAJOR, m), 161 DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666, 162 "pty%c%x", j + START_CHAR, i); 163 } 164 } 165done: 166 _pty_driver.master = PTY_MAJOR; 167 _pty_driver.slave = TTY_MAJOR; 168 _pty_driver.open_reset = 1; 169 _pty_driver.open = &pty_get_ioctl; 170 _pty_driver.name = &pty_get_name; 171 tty_dev_register(&_pty_driver); 172 return (0); 173} 174#endif // DEVFS 175