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33 * @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
34 * $FreeBSD: src/sys/kern/tty_tty.c,v 1.30 1999/09/25 18:24:24 phk Exp $
35 * $DragonFly: src/sys/kern/tty_tty.c,v 1.12 2005/01/29 05:48:17 dillon Exp $
39 * Indirect driver for controlling tty.
42 #include <sys/param.h>
43 #include <sys/systm.h>
47 #include <sys/ttycom.h>
48 #include <sys/vnode.h>
49 #include <sys/kernel.h>
51 static d_open_t cttyopen;
52 static d_close_t cttyclose;
53 static d_read_t cttyread;
54 static d_write_t cttywrite;
55 static d_ioctl_t cttyioctl;
56 static d_poll_t cttypoll;
59 /* Don't make this static, since fdesc_vnops uses it. */
60 struct cdevsw ctty_cdevsw = {
68 /* close */ cttyclose,
70 /* write */ cttywrite,
71 /* ioctl */ cttyioctl,
74 /* strategy */ nostrategy,
79 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
83 cttyopen(dev_t dev, int flag, int mode, struct thread *td)
85 struct proc *p = td->td_proc;
92 if (ttyvp->v_flag & VCTTYISOPEN) {
95 vsetflags(ttyvp, VCTTYISOPEN);
96 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
97 error = VOP_OPEN(ttyvp, flag, NOCRED, NULL, td);
99 vclrflags(ttyvp, VCTTYISOPEN);
100 VOP_UNLOCK(ttyvp, 0, td);
109 cttyclose(dev_t dev, int fflag, int devtype, struct thread *td)
111 struct proc *p = td->td_proc;
119 * The tty may have been TIOCNOTTY'd, don't return an
120 * error on close. We just have nothing to do.
124 } else if (ttyvp->v_flag & VCTTYISOPEN) {
125 vclrflags(ttyvp, VCTTYISOPEN);
126 error = vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
128 error = VOP_CLOSE(ttyvp, fflag, td);
129 VOP_UNLOCK(ttyvp, 0, td);
139 cttyread(dev, uio, flag)
144 struct thread *td = uio->uio_td;
145 struct proc *p = td->td_proc;
153 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
154 error = VOP_READ(ttyvp, uio, flag, NOCRED);
155 VOP_UNLOCK(ttyvp, 0, td);
161 cttywrite(dev, uio, flag)
166 struct thread *td = uio->uio_td;
167 struct proc *p = td->td_proc;
175 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
176 error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
177 VOP_UNLOCK(ttyvp, 0, td);
183 cttyioctl(dev, cmd, addr, flag, td)
191 struct proc *p = td->td_proc;
197 if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
198 return EINVAL; /* to controlling tty -- infinite recursion */
199 if (cmd == TIOCNOTTY) {
200 if (!SESS_LEADER(p)) {
201 p->p_flag &= ~P_CONTROLT;
206 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, td));
211 cttypoll(dev_t dev, int events, struct thread *td)
214 struct proc *p = td->td_proc;
219 /* try operation to get EOF/failure */
220 return (seltrue(dev, events, td));
221 return (VOP_POLL(ttyvp, events, p->p_ucred, td));
224 static void ctty_drvinit (void *unused);
229 cdevsw_add(&ctty_cdevsw, 0, 0);
230 make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "tty");
233 SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)