tty_tty.c revision 126080
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: head/sys/kern/tty_tty.c 126080 2004-02-21 21:10:55Z phk $"); 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> 34109524Sphk#include <sys/vnode.h> 35109524Sphk 36109524Sphkstatic d_open_t cttyopen; 37109524Sphk 38109524Sphk#define CDEV_MAJOR 1 39109524Sphk 40109524Sphkstatic struct cdevsw ctty_cdevsw = { 41126080Sphk .d_version = D_VERSION, 42111815Sphk .d_open = cttyopen, 43111815Sphk .d_name = "ctty", 44111815Sphk .d_maj = CDEV_MAJOR, 45126080Sphk .d_flags = D_TTY | D_NEEDGIANT, 46109524Sphk}; 47109524Sphk 48109524Sphkstatic dev_t ctty; 49109524Sphk 50109524Sphkstatic int 51109524Sphkcttyopen(dev_t dev, int flag, int mode, struct thread *td) 52109524Sphk{ 53109524Sphk 54109524Sphk return (ENXIO); 55109524Sphk} 56109524Sphk 57109524Sphkstatic void 58109524Sphkctty_clone(void *arg, char *name, int namelen, dev_t *dev) 59109524Sphk{ 60109524Sphk 61109524Sphk if (*dev != NODEV) 62109524Sphk return; 63109524Sphk if (strcmp(name, "tty")) 64109524Sphk return; 65109940Sphk if (!(curthread->td_proc->p_flag & P_CONTROLT)) 66109940Sphk *dev = ctty; 67109940Sphk else if (curthread->td_proc->p_session->s_ttyvp == NULL) 68109940Sphk *dev = ctty; 69109940Sphk else 70109524Sphk *dev = curthread->td_proc->p_session->s_ttyvp->v_rdev; 71109524Sphk} 72109524Sphk 73109524Sphkstatic void 74109524Sphkctty_drvinit(void *unused) 75109524Sphk{ 76109524Sphk 77109524Sphk EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000); 78109524Sphk ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty"); 79109524Sphk} 80109524Sphk 81109524SphkSYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL) 82