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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 1.10 2004/10/12 19:20:46 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, td);
98 VOP_UNLOCK(ttyvp, 0, td);
107 cttyclose(dev_t dev, int fflag, int devtype, struct thread *td)
109 struct proc *p = td->td_proc;
117 * The tty may have been TIOCNOTTY'd, don't return an
118 * error on close. We just have nothing to do.
122 } else if (ttyvp->v_flag & VCTTYISOPEN) {
123 vclrflags(ttyvp, VCTTYISOPEN);
124 error = vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
126 error = VOP_CLOSE(ttyvp, fflag, td);
127 VOP_UNLOCK(ttyvp, 0, td);
137 cttyread(dev, uio, flag)
142 struct thread *td = uio->uio_td;
143 struct proc *p = td->td_proc;
151 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
152 error = VOP_READ(ttyvp, uio, flag, NOCRED);
153 VOP_UNLOCK(ttyvp, 0, td);
159 cttywrite(dev, uio, flag)
164 struct thread *td = uio->uio_td;
165 struct proc *p = td->td_proc;
173 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
174 error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
175 VOP_UNLOCK(ttyvp, 0, td);
181 cttyioctl(dev, cmd, addr, flag, td)
189 struct proc *p = td->td_proc;
195 if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
196 return EINVAL; /* to controlling tty -- infinite recursion */
197 if (cmd == TIOCNOTTY) {
198 if (!SESS_LEADER(p)) {
199 p->p_flag &= ~P_CONTROLT;
204 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, td));
209 cttypoll(dev_t dev, int events, struct thread *td)
212 struct proc *p = td->td_proc;
217 /* try operation to get EOF/failure */
218 return (seltrue(dev, events, td));
219 return (VOP_POLL(ttyvp, events, p->p_ucred, td));
222 static void ctty_drvinit (void *unused);
227 cdevsw_add(&ctty_cdevsw, 0, 0);
228 make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "tty");
231 SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)