1/*- 2 * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Portions of this software were developed under sponsorship from Snow 6 * B.V., the Netherlands. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#include <sys/cdefs.h>
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31__FBSDID("$FreeBSD: head/sys/kern/tty_pty.c 196378 2009-08-19 14:30:46Z ed $");
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31__FBSDID("$FreeBSD: head/sys/dev/pty/pty.c 196480 2009-08-23 20:26:09Z ed $"); |
32 33#include <sys/param.h> 34#include <sys/conf.h> 35#include <sys/eventhandler.h> 36#include <sys/fcntl.h> 37#include <sys/kernel.h>
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38#include <sys/module.h> |
39#include <sys/proc.h> 40#include <sys/sysctl.h> 41#include <sys/syslog.h> 42#include <sys/systm.h> 43#include <sys/tty.h> 44 45/* 46 * This driver implements a BSD-style compatibility naming scheme for 47 * the pts(4) driver. We just call into pts(4) to create the actual PTY. 48 * To make sure we don't use the same PTY multiple times, we abuse 49 * si_drv1 inside the cdev to mark whether the PTY is in use. 50 */ 51 52static unsigned int pty_warningcnt = 1; 53SYSCTL_UINT(_kern, OID_AUTO, tty_pty_warningcnt, CTLFLAG_RW, 54 &pty_warningcnt, 0, 55 "Warnings that will be triggered upon legacy PTY allocation"); 56 57static int 58ptydev_fdopen(struct cdev *dev, int fflags, struct thread *td, struct file *fp) 59{ 60 int error; 61 char name[6]; /* "ttyXX" */ 62 63 if (!atomic_cmpset_ptr((uintptr_t *)&dev->si_drv1, 0, 1)) 64 return (EBUSY); 65 66 /* Generate device name and create PTY. */ 67 strcpy(name, devtoname(dev)); 68 name[0] = 't'; 69 70 error = pts_alloc_external(fflags & (FREAD|FWRITE), td, fp, dev, name); 71 if (error != 0) { 72 destroy_dev_sched(dev); 73 return (error); 74 } 75 76 /* Raise a warning when a legacy PTY has been allocated. */ 77 if (pty_warningcnt > 0) { 78 pty_warningcnt--; 79 log(LOG_INFO, "pid %d (%s) is using legacy pty devices%s\n", 80 td->td_proc->p_pid, td->td_name, 81 pty_warningcnt ? "" : " - not logging anymore"); 82 } 83 84 return (0); 85} 86 87static struct cdevsw ptydev_cdevsw = { 88 .d_version = D_VERSION, 89 .d_fdopen = ptydev_fdopen, 90 .d_name = "ptydev", 91}; 92 93static void 94pty_clone(void *arg, struct ucred *cr, char *name, int namelen, 95 struct cdev **dev) 96{ 97 98 /* Cloning is already satisfied. */ 99 if (*dev != NULL) 100 return; 101 102 /* Only catch /dev/ptyXX. */ 103 if (namelen != 5 || bcmp(name, "pty", 3) != 0) 104 return; 105 106 /* Only catch /dev/pty[l-sL-S]X. */ 107 if (!(name[3] >= 'l' && name[3] <= 's') && 108 !(name[3] >= 'L' && name[3] <= 'S')) 109 return; 110 111 /* Only catch /dev/pty[l-sL-S][0-9a-v]. */ 112 if (!(name[4] >= '0' && name[4] <= '9') && 113 !(name[4] >= 'a' && name[4] <= 'v')) 114 return; 115 116 /* Create the controller device node. */ 117 *dev = make_dev_credf(MAKEDEV_REF, &ptydev_cdevsw, 0, 118 NULL, UID_ROOT, GID_WHEEL, 0666, "%s", name); 119} 120
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120static void
121pty_init(void *unused)
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121static int 122pty_modevent(module_t mod, int type, void *data) |
123{ 124
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124 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
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125 switch(type) { 126 case MOD_LOAD: 127 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 128 break; 129 case MOD_SHUTDOWN: 130 break; 131 case MOD_UNLOAD: 132 /* XXX: No unloading support yet. */ 133 return (EBUSY); 134 default: 135 return (EOPNOTSUPP); 136 } 137 138 return (0); |
139} 140
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127SYSINIT(pty, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, pty_init, NULL);
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141DEV_MODULE(pty, pty_modevent, NULL); |
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