11541Srgrimes/*- 2109524Sphk * Copyright (c) 2003 Poul-Henning Kamp. All rights reserved. 3109524Sphk * 4109524Sphk * Redistribution and use in source and binary forms, with or without 5109524Sphk * modification, are permitted provided that the following conditions 6109524Sphk * are met: 7109524Sphk * 1. Redistributions of source code must retain the above copyright 8109524Sphk * notice, this list of conditions and the following disclaimer. 9109524Sphk * 2. Redistributions in binary form must reproduce the above copyright 10109524Sphk * notice, this list of conditions and the following disclaimer in the 11109524Sphk * documentation and/or other materials provided with the distribution. 12109524Sphk * 13109524Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14109524Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15109524Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16109524Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17109524Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18109524Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19109524Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20109524Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21109524Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22109524Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23109524Sphk * SUCH DAMAGE. 24109524Sphk */ 25109524Sphk 26116182Sobrien#include <sys/cdefs.h> 27116182Sobrien__FBSDID("$FreeBSD$"); 28116182Sobrien 29109524Sphk#include <sys/param.h> 30109524Sphk#include <sys/systm.h> 31109524Sphk#include <sys/conf.h> 32109524Sphk#include <sys/kernel.h> 33109524Sphk#include <sys/proc.h> 34171186Skib#include <sys/sx.h> 35109524Sphk#include <sys/vnode.h> 36109524Sphk 37171186Skib#include <fs/devfs/devfs.h> 38171186Skib#include <fs/devfs/devfs_int.h> 39171186Skib 40109524Sphkstatic d_open_t cttyopen; 41109524Sphk 42109524Sphkstatic struct cdevsw ctty_cdevsw = { 43126080Sphk .d_version = D_VERSION, 44111815Sphk .d_open = cttyopen, 45111815Sphk .d_name = "ctty", 46109524Sphk}; 47109524Sphk 48130585Sphkstatic struct cdev *ctty; 49109524Sphk 50109524Sphkstatic int 51130585Sphkcttyopen(struct cdev *dev, int flag, int mode, struct thread *td) 52109524Sphk{ 53109524Sphk 54109524Sphk return (ENXIO); 55109524Sphk} 56109524Sphk 57109524Sphkstatic void 58148868Srwatsonctty_clone(void *arg, struct ucred *cred, char *name, int namelen, 59148868Srwatson struct cdev **dev) 60109524Sphk{ 61109524Sphk 62130640Sphk if (*dev != NULL) 63109524Sphk return; 64109524Sphk if (strcmp(name, "tty")) 65109524Sphk return; 66171186Skib sx_sunlock(&clone_drain_lock); 67171186Skib sx_slock(&proctree_lock); 68171186Skib sx_slock(&clone_drain_lock); 69171186Skib dev_lock(); 70109940Sphk if (!(curthread->td_proc->p_flag & P_CONTROLT)) 71109940Sphk *dev = ctty; 72109940Sphk else if (curthread->td_proc->p_session->s_ttyvp == NULL) 73109940Sphk *dev = ctty; 74162573Smbr else if (curthread->td_proc->p_session->s_ttyvp->v_type == VBAD || 75162573Smbr curthread->td_proc->p_session->s_ttyvp->v_rdev == NULL) { 76162573Smbr /* e.g. s_ttyvp was revoked */ 77162705Smbr *dev = ctty; 78162573Smbr } else 79109524Sphk *dev = curthread->td_proc->p_session->s_ttyvp->v_rdev; 80171186Skib dev_refl(*dev); 81171186Skib dev_unlock(); 82171186Skib sx_sunlock(&proctree_lock); 83109524Sphk} 84109524Sphk 85109524Sphkstatic void 86109524Sphkctty_drvinit(void *unused) 87109524Sphk{ 88109524Sphk 89109524Sphk EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000); 90216952Skib ctty = make_dev_credf(MAKEDEV_ETERNAL, &ctty_cdevsw, 0, NULL, UID_ROOT, 91216952Skib GID_WHEEL, 0666, "ctty"); 92109524Sphk} 93109524Sphk 94177253SrwatsonSYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ctty_drvinit,NULL); 95