1/*
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
| 1/*
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
|
34 * $FreeBSD: head/sys/kern/tty_pty.c 53483 1999-11-21 02:54:54Z jkh $
| 34 * $FreeBSD: head/sys/kern/tty_pty.c 57070 2000-02-09 03:32:11Z rwatson $
|
35 */
36
37/*
38 * Pseudo-teletype Driver
39 * (Actually two drivers, requiring two entries in 'cdevsw')
40 */
41#include "pty.h" /* XXX */
42#include "opt_compat.h"
43#include <sys/param.h>
44#include <sys/systm.h>
45#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
46#include <sys/ioctl_compat.h>
47#endif
48#include <sys/proc.h>
49#include <sys/tty.h>
50#include <sys/conf.h>
51#include <sys/fcntl.h>
52#include <sys/poll.h>
53#include <sys/kernel.h>
54#include <sys/vnode.h>
55#include <sys/signalvar.h>
56#include <sys/malloc.h>
57
58MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
59
60static void ptsstart __P((struct tty *tp));
61static void ptsstop __P((struct tty *tp, int rw));
62static void ptcwakeup __P((struct tty *tp, int flag));
63static void ptyinit __P((int n));
64
65static d_open_t ptsopen;
66static d_close_t ptsclose;
67static d_read_t ptsread;
68static d_write_t ptswrite;
69static d_ioctl_t ptyioctl;
70static d_open_t ptcopen;
71static d_close_t ptcclose;
72static d_read_t ptcread;
73static d_write_t ptcwrite;
74static d_poll_t ptcpoll;
75
76#define CDEV_MAJOR_S 5
77static struct cdevsw pts_cdevsw = {
78 /* open */ ptsopen,
79 /* close */ ptsclose,
80 /* read */ ptsread,
81 /* write */ ptswrite,
82 /* ioctl */ ptyioctl,
83 /* poll */ ttypoll,
84 /* mmap */ nommap,
85 /* strategy */ nostrategy,
86 /* name */ "pts",
87 /* maj */ CDEV_MAJOR_S,
88 /* dump */ nodump,
89 /* psize */ nopsize,
90 /* flags */ D_TTY,
91 /* bmaj */ -1
92};
93
94#define CDEV_MAJOR_C 6
95static struct cdevsw ptc_cdevsw = {
96 /* open */ ptcopen,
97 /* close */ ptcclose,
98 /* read */ ptcread,
99 /* write */ ptcwrite,
100 /* ioctl */ ptyioctl,
101 /* poll */ ptcpoll,
102 /* mmap */ nommap,
103 /* strategy */ nostrategy,
104 /* name */ "ptc",
105 /* maj */ CDEV_MAJOR_C,
106 /* dump */ nodump,
107 /* psize */ nopsize,
108 /* flags */ D_TTY,
109 /* bmaj */ -1
110};
111
112#define BUFSIZ 100 /* Chunk size iomoved to/from user */
113
114struct pt_ioctl {
115 int pt_flags;
116 struct selinfo pt_selr, pt_selw;
117 u_char pt_send;
118 u_char pt_ucntl;
119 struct tty pt_tty;
120 dev_t devs, devc;
| 35 */
36
37/*
38 * Pseudo-teletype Driver
39 * (Actually two drivers, requiring two entries in 'cdevsw')
40 */
41#include "pty.h" /* XXX */
42#include "opt_compat.h"
43#include <sys/param.h>
44#include <sys/systm.h>
45#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
46#include <sys/ioctl_compat.h>
47#endif
48#include <sys/proc.h>
49#include <sys/tty.h>
50#include <sys/conf.h>
51#include <sys/fcntl.h>
52#include <sys/poll.h>
53#include <sys/kernel.h>
54#include <sys/vnode.h>
55#include <sys/signalvar.h>
56#include <sys/malloc.h>
57
58MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
59
60static void ptsstart __P((struct tty *tp));
61static void ptsstop __P((struct tty *tp, int rw));
62static void ptcwakeup __P((struct tty *tp, int flag));
63static void ptyinit __P((int n));
64
65static d_open_t ptsopen;
66static d_close_t ptsclose;
67static d_read_t ptsread;
68static d_write_t ptswrite;
69static d_ioctl_t ptyioctl;
70static d_open_t ptcopen;
71static d_close_t ptcclose;
72static d_read_t ptcread;
73static d_write_t ptcwrite;
74static d_poll_t ptcpoll;
75
76#define CDEV_MAJOR_S 5
77static struct cdevsw pts_cdevsw = {
78 /* open */ ptsopen,
79 /* close */ ptsclose,
80 /* read */ ptsread,
81 /* write */ ptswrite,
82 /* ioctl */ ptyioctl,
83 /* poll */ ttypoll,
84 /* mmap */ nommap,
85 /* strategy */ nostrategy,
86 /* name */ "pts",
87 /* maj */ CDEV_MAJOR_S,
88 /* dump */ nodump,
89 /* psize */ nopsize,
90 /* flags */ D_TTY,
91 /* bmaj */ -1
92};
93
94#define CDEV_MAJOR_C 6
95static struct cdevsw ptc_cdevsw = {
96 /* open */ ptcopen,
97 /* close */ ptcclose,
98 /* read */ ptcread,
99 /* write */ ptcwrite,
100 /* ioctl */ ptyioctl,
101 /* poll */ ptcpoll,
102 /* mmap */ nommap,
103 /* strategy */ nostrategy,
104 /* name */ "ptc",
105 /* maj */ CDEV_MAJOR_C,
106 /* dump */ nodump,
107 /* psize */ nopsize,
108 /* flags */ D_TTY,
109 /* bmaj */ -1
110};
111
112#define BUFSIZ 100 /* Chunk size iomoved to/from user */
113
114struct pt_ioctl {
115 int pt_flags;
116 struct selinfo pt_selr, pt_selw;
117 u_char pt_send;
118 u_char pt_ucntl;
119 struct tty pt_tty;
120 dev_t devs, devc;
|
| 121 struct prison *pt_prison;
|
121};
122
123#define PF_PKT 0x08 /* packet mode */
124#define PF_STOPPED 0x10 /* user told stopped */
125#define PF_REMOTE 0x20 /* remote and flow controlled input */
126#define PF_NOSTOP 0x40
127#define PF_UCNTL 0x80 /* user control mode */
128
129/*
130 * This function creates and initializes a pts/ptc pair
131 *
132 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
133 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
134 *
135 * XXX: define and add mapping of upper minor bits to allow more
136 * than 256 ptys.
137 */
138static void
139ptyinit(n)
140 int n;
141{
142 dev_t devs, devc;
143 char *names = "pqrsPQRS";
144 struct pt_ioctl *pt;
145
146 /* For now we only map the lower 8 bits of the minor */
147 if (n & ~0xff)
148 return;
149
150 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK);
151 bzero(pt, sizeof(*pt));
152 pt->devs = devs = make_dev(&pts_cdevsw, n,
153 0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
154 pt->devc = devc = make_dev(&ptc_cdevsw, n,
155 0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
156
157 devs->si_drv1 = devc->si_drv1 = pt;
158 devs->si_tty = devc->si_tty = &pt->pt_tty;
159 ttyregister(&pt->pt_tty);
160}
161
162/*ARGSUSED*/
163static int
164ptsopen(dev, flag, devtype, p)
165 dev_t dev;
166 int flag, devtype;
167 struct proc *p;
168{
169 register struct tty *tp;
170 int error;
171 int minr;
172 dev_t nextdev;
| 122};
123
124#define PF_PKT 0x08 /* packet mode */
125#define PF_STOPPED 0x10 /* user told stopped */
126#define PF_REMOTE 0x20 /* remote and flow controlled input */
127#define PF_NOSTOP 0x40
128#define PF_UCNTL 0x80 /* user control mode */
129
130/*
131 * This function creates and initializes a pts/ptc pair
132 *
133 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
134 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
135 *
136 * XXX: define and add mapping of upper minor bits to allow more
137 * than 256 ptys.
138 */
139static void
140ptyinit(n)
141 int n;
142{
143 dev_t devs, devc;
144 char *names = "pqrsPQRS";
145 struct pt_ioctl *pt;
146
147 /* For now we only map the lower 8 bits of the minor */
148 if (n & ~0xff)
149 return;
150
151 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK);
152 bzero(pt, sizeof(*pt));
153 pt->devs = devs = make_dev(&pts_cdevsw, n,
154 0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
155 pt->devc = devc = make_dev(&ptc_cdevsw, n,
156 0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
157
158 devs->si_drv1 = devc->si_drv1 = pt;
159 devs->si_tty = devc->si_tty = &pt->pt_tty;
160 ttyregister(&pt->pt_tty);
161}
162
163/*ARGSUSED*/
164static int
165ptsopen(dev, flag, devtype, p)
166 dev_t dev;
167 int flag, devtype;
168 struct proc *p;
169{
170 register struct tty *tp;
171 int error;
172 int minr;
173 dev_t nextdev;
|
| 174 struct pt_ioctl *pti;
|
173
174 /*
175 * XXX: Gross hack for DEVFS:
176 * If we openned this device, ensure we have the
177 * next one too, so people can open it.
178 */
179 minr = lminor(dev);
180 if (minr < 255) {
181 nextdev = makedev(major(dev), minr + 1);
182 if (!nextdev->si_drv1) {
183 ptyinit(minr + 1);
184 }
185 }
186 if (!dev->si_drv1)
187 ptyinit(minor(dev));
188 if (!dev->si_drv1)
189 return(ENXIO);
| 175
176 /*
177 * XXX: Gross hack for DEVFS:
178 * If we openned this device, ensure we have the
179 * next one too, so people can open it.
180 */
181 minr = lminor(dev);
182 if (minr < 255) {
183 nextdev = makedev(major(dev), minr + 1);
184 if (!nextdev->si_drv1) {
185 ptyinit(minr + 1);
186 }
187 }
188 if (!dev->si_drv1)
189 ptyinit(minor(dev));
190 if (!dev->si_drv1)
191 return(ENXIO);
|
| 192 pti = dev->si_drv1;
|
190 tp = dev->si_tty;
191 if ((tp->t_state & TS_ISOPEN) == 0) {
192 ttychars(tp); /* Set up default chars */
193 tp->t_iflag = TTYDEF_IFLAG;
194 tp->t_oflag = TTYDEF_OFLAG;
195 tp->t_lflag = TTYDEF_LFLAG;
196 tp->t_cflag = TTYDEF_CFLAG;
197 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
| 193 tp = dev->si_tty;
194 if ((tp->t_state & TS_ISOPEN) == 0) {
195 ttychars(tp); /* Set up default chars */
196 tp->t_iflag = TTYDEF_IFLAG;
197 tp->t_oflag = TTYDEF_OFLAG;
198 tp->t_lflag = TTYDEF_LFLAG;
199 tp->t_cflag = TTYDEF_CFLAG;
200 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
|
198 } else if (tp->t_state & TS_XCLUDE && suser(p))
| 201 } else if (tp->t_state & TS_XCLUDE && suser(p)) {
|
199 return (EBUSY);
| 202 return (EBUSY);
|
| 203 } else if (pti->pt_prison != p->p_prison) {
204 return (EBUSY);
205 }
|
200 if (tp->t_oproc) /* Ctrlr still around. */
201 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
202 while ((tp->t_state & TS_CARR_ON) == 0) {
203 if (flag&FNONBLOCK)
204 break;
205 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
206 "ptsopn", 0);
207 if (error)
208 return (error);
209 }
210 error = (*linesw[tp->t_line].l_open)(dev, tp);
211 if (error == 0)
212 ptcwakeup(tp, FREAD|FWRITE);
213 return (error);
214}
215
216static int
217ptsclose(dev, flag, mode, p)
218 dev_t dev;
219 int flag, mode;
220 struct proc *p;
221{
222 register struct tty *tp;
223 int err;
224
225 tp = dev->si_tty;
226 err = (*linesw[tp->t_line].l_close)(tp, flag);
227 ptsstop(tp, FREAD|FWRITE);
228 (void) ttyclose(tp);
229 return (err);
230}
231
232static int
233ptsread(dev, uio, flag)
234 dev_t dev;
235 struct uio *uio;
236 int flag;
237{
238 struct proc *p = curproc;
239 register struct tty *tp = dev->si_tty;
240 register struct pt_ioctl *pti = dev->si_drv1;
241 int error = 0;
242
243again:
244 if (pti->pt_flags & PF_REMOTE) {
245 while (isbackground(p, tp)) {
246 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
247 SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
248 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT)
249 return (EIO);
250 pgsignal(p->p_pgrp, SIGTTIN, 1);
251 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg",
252 0);
253 if (error)
254 return (error);
255 }
256 if (tp->t_canq.c_cc == 0) {
257 if (flag & IO_NDELAY)
258 return (EWOULDBLOCK);
259 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH,
260 "ptsin", 0);
261 if (error)
262 return (error);
263 goto again;
264 }
265 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
266 if (ureadc(getc(&tp->t_canq), uio) < 0) {
267 error = EFAULT;
268 break;
269 }
270 if (tp->t_canq.c_cc == 1)
271 (void) getc(&tp->t_canq);
272 if (tp->t_canq.c_cc)
273 return (error);
274 } else
275 if (tp->t_oproc)
276 error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
277 ptcwakeup(tp, FWRITE);
278 return (error);
279}
280
281/*
282 * Write to pseudo-tty.
283 * Wakeups of controlling tty will happen
284 * indirectly, when tty driver calls ptsstart.
285 */
286static int
287ptswrite(dev, uio, flag)
288 dev_t dev;
289 struct uio *uio;
290 int flag;
291{
292 register struct tty *tp;
293
294 tp = dev->si_tty;
295 if (tp->t_oproc == 0)
296 return (EIO);
297 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
298}
299
300/*
301 * Start output on pseudo-tty.
302 * Wake up process selecting or sleeping for input from controlling tty.
303 */
304static void
305ptsstart(tp)
306 struct tty *tp;
307{
308 register struct pt_ioctl *pti = tp->t_dev->si_drv1;
309
310 if (tp->t_state & TS_TTSTOP)
311 return;
312 if (pti->pt_flags & PF_STOPPED) {
313 pti->pt_flags &= ~PF_STOPPED;
314 pti->pt_send = TIOCPKT_START;
315 }
316 ptcwakeup(tp, FREAD);
317}
318
319static void
320ptcwakeup(tp, flag)
321 struct tty *tp;
322 int flag;
323{
324 struct pt_ioctl *pti = tp->t_dev->si_drv1;
325
326 if (flag & FREAD) {
327 selwakeup(&pti->pt_selr);
328 wakeup(TSA_PTC_READ(tp));
329 }
330 if (flag & FWRITE) {
331 selwakeup(&pti->pt_selw);
332 wakeup(TSA_PTC_WRITE(tp));
333 }
334}
335
336static int
337ptcopen(dev, flag, devtype, p)
338 dev_t dev;
339 int flag, devtype;
340 struct proc *p;
341{
342 register struct tty *tp;
343 struct pt_ioctl *pti;
344
345 if (!dev->si_drv1)
346 ptyinit(minor(dev));
347 if (!dev->si_drv1)
348 return(ENXIO);
349 tp = dev->si_tty;
350 if (tp->t_oproc)
351 return (EIO);
352 tp->t_oproc = ptsstart;
353 tp->t_stop = ptsstop;
354 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
355 tp->t_lflag &= ~EXTPROC;
356 pti = dev->si_drv1;
| 206 if (tp->t_oproc) /* Ctrlr still around. */
207 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
208 while ((tp->t_state & TS_CARR_ON) == 0) {
209 if (flag&FNONBLOCK)
210 break;
211 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
212 "ptsopn", 0);
213 if (error)
214 return (error);
215 }
216 error = (*linesw[tp->t_line].l_open)(dev, tp);
217 if (error == 0)
218 ptcwakeup(tp, FREAD|FWRITE);
219 return (error);
220}
221
222static int
223ptsclose(dev, flag, mode, p)
224 dev_t dev;
225 int flag, mode;
226 struct proc *p;
227{
228 register struct tty *tp;
229 int err;
230
231 tp = dev->si_tty;
232 err = (*linesw[tp->t_line].l_close)(tp, flag);
233 ptsstop(tp, FREAD|FWRITE);
234 (void) ttyclose(tp);
235 return (err);
236}
237
238static int
239ptsread(dev, uio, flag)
240 dev_t dev;
241 struct uio *uio;
242 int flag;
243{
244 struct proc *p = curproc;
245 register struct tty *tp = dev->si_tty;
246 register struct pt_ioctl *pti = dev->si_drv1;
247 int error = 0;
248
249again:
250 if (pti->pt_flags & PF_REMOTE) {
251 while (isbackground(p, tp)) {
252 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
253 SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
254 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT)
255 return (EIO);
256 pgsignal(p->p_pgrp, SIGTTIN, 1);
257 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg",
258 0);
259 if (error)
260 return (error);
261 }
262 if (tp->t_canq.c_cc == 0) {
263 if (flag & IO_NDELAY)
264 return (EWOULDBLOCK);
265 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH,
266 "ptsin", 0);
267 if (error)
268 return (error);
269 goto again;
270 }
271 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
272 if (ureadc(getc(&tp->t_canq), uio) < 0) {
273 error = EFAULT;
274 break;
275 }
276 if (tp->t_canq.c_cc == 1)
277 (void) getc(&tp->t_canq);
278 if (tp->t_canq.c_cc)
279 return (error);
280 } else
281 if (tp->t_oproc)
282 error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
283 ptcwakeup(tp, FWRITE);
284 return (error);
285}
286
287/*
288 * Write to pseudo-tty.
289 * Wakeups of controlling tty will happen
290 * indirectly, when tty driver calls ptsstart.
291 */
292static int
293ptswrite(dev, uio, flag)
294 dev_t dev;
295 struct uio *uio;
296 int flag;
297{
298 register struct tty *tp;
299
300 tp = dev->si_tty;
301 if (tp->t_oproc == 0)
302 return (EIO);
303 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
304}
305
306/*
307 * Start output on pseudo-tty.
308 * Wake up process selecting or sleeping for input from controlling tty.
309 */
310static void
311ptsstart(tp)
312 struct tty *tp;
313{
314 register struct pt_ioctl *pti = tp->t_dev->si_drv1;
315
316 if (tp->t_state & TS_TTSTOP)
317 return;
318 if (pti->pt_flags & PF_STOPPED) {
319 pti->pt_flags &= ~PF_STOPPED;
320 pti->pt_send = TIOCPKT_START;
321 }
322 ptcwakeup(tp, FREAD);
323}
324
325static void
326ptcwakeup(tp, flag)
327 struct tty *tp;
328 int flag;
329{
330 struct pt_ioctl *pti = tp->t_dev->si_drv1;
331
332 if (flag & FREAD) {
333 selwakeup(&pti->pt_selr);
334 wakeup(TSA_PTC_READ(tp));
335 }
336 if (flag & FWRITE) {
337 selwakeup(&pti->pt_selw);
338 wakeup(TSA_PTC_WRITE(tp));
339 }
340}
341
342static int
343ptcopen(dev, flag, devtype, p)
344 dev_t dev;
345 int flag, devtype;
346 struct proc *p;
347{
348 register struct tty *tp;
349 struct pt_ioctl *pti;
350
351 if (!dev->si_drv1)
352 ptyinit(minor(dev));
353 if (!dev->si_drv1)
354 return(ENXIO);
355 tp = dev->si_tty;
356 if (tp->t_oproc)
357 return (EIO);
358 tp->t_oproc = ptsstart;
359 tp->t_stop = ptsstop;
360 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
361 tp->t_lflag &= ~EXTPROC;
362 pti = dev->si_drv1;
|
| 363 pti->pt_prison = p->p_prison;
|
357 pti->pt_flags = 0;
358 pti->pt_send = 0;
359 pti->pt_ucntl = 0;
360 return (0);
361}
362
363static int
364ptcclose(dev, flags, fmt, p)
365 dev_t dev;
366 int flags;
367 int fmt;
368 struct proc *p;
369{
370 register struct tty *tp;
371
372 tp = dev->si_tty;
373 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
374
375 /*
376 * XXX MDMBUF makes no sense for ptys but would inhibit the above
377 * l_modem(). CLOCAL makes sense but isn't supported. Special
378 * l_modem()s that ignore carrier drop make no sense for ptys but
379 * may be in use because other parts of the line discipline make
380 * sense for ptys. Recover by doing everything that a normal
381 * ttymodem() would have done except for sending a SIGHUP.
382 */
383 if (tp->t_state & TS_ISOPEN) {
384 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
385 tp->t_state |= TS_ZOMBIE;
386 ttyflush(tp, FREAD | FWRITE);
387 }
388
389 tp->t_oproc = 0; /* mark closed */
390 return (0);
391}
392
393static int
394ptcread(dev, uio, flag)
395 dev_t dev;
396 struct uio *uio;
397 int flag;
398{
399 register struct tty *tp = dev->si_tty;
400 struct pt_ioctl *pti = dev->si_drv1;
401 char buf[BUFSIZ];
402 int error = 0, cc;
403
404 /*
405 * We want to block until the slave
406 * is open, and there's something to read;
407 * but if we lost the slave or we're NBIO,
408 * then return the appropriate error instead.
409 */
410 for (;;) {
411 if (tp->t_state&TS_ISOPEN) {
412 if (pti->pt_flags&PF_PKT && pti->pt_send) {
413 error = ureadc((int)pti->pt_send, uio);
414 if (error)
415 return (error);
416 if (pti->pt_send & TIOCPKT_IOCTL) {
417 cc = min(uio->uio_resid,
418 sizeof(tp->t_termios));
419 uiomove((caddr_t)&tp->t_termios, cc,
420 uio);
421 }
422 pti->pt_send = 0;
423 return (0);
424 }
425 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
426 error = ureadc((int)pti->pt_ucntl, uio);
427 if (error)
428 return (error);
429 pti->pt_ucntl = 0;
430 return (0);
431 }
432 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
433 break;
434 }
435 if ((tp->t_state & TS_CONNECTED) == 0)
436 return (0); /* EOF */
437 if (flag & IO_NDELAY)
438 return (EWOULDBLOCK);
439 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
440 if (error)
441 return (error);
442 }
443 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
444 error = ureadc(0, uio);
445 while (uio->uio_resid > 0 && error == 0) {
446 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
447 if (cc <= 0)
448 break;
449 error = uiomove(buf, cc, uio);
450 }
451 ttwwakeup(tp);
452 return (error);
453}
454
455static void
456ptsstop(tp, flush)
457 register struct tty *tp;
458 int flush;
459{
460 struct pt_ioctl *pti = tp->t_dev->si_drv1;
461 int flag;
462
463 /* note: FLUSHREAD and FLUSHWRITE already ok */
464 if (flush == 0) {
465 flush = TIOCPKT_STOP;
466 pti->pt_flags |= PF_STOPPED;
467 } else
468 pti->pt_flags &= ~PF_STOPPED;
469 pti->pt_send |= flush;
470 /* change of perspective */
471 flag = 0;
472 if (flush & FREAD)
473 flag |= FWRITE;
474 if (flush & FWRITE)
475 flag |= FREAD;
476 ptcwakeup(tp, flag);
477}
478
479static int
480ptcpoll(dev, events, p)
481 dev_t dev;
482 int events;
483 struct proc *p;
484{
485 register struct tty *tp = dev->si_tty;
486 struct pt_ioctl *pti = dev->si_drv1;
487 int revents = 0;
488 int s;
489
490 if ((tp->t_state & TS_CONNECTED) == 0)
491 return (seltrue(dev, events, p) | POLLHUP);
492
493 /*
494 * Need to block timeouts (ttrstart).
495 */
496 s = spltty();
497
498 if (events & (POLLIN | POLLRDNORM))
499 if ((tp->t_state & TS_ISOPEN) &&
500 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
501 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
502 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
503 revents |= events & (POLLIN | POLLRDNORM);
504
505 if (events & (POLLOUT | POLLWRNORM))
506 if (tp->t_state & TS_ISOPEN &&
507 ((pti->pt_flags & PF_REMOTE) ?
508 (tp->t_canq.c_cc == 0) :
509 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
510 (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON)))))
511 revents |= events & (POLLOUT | POLLWRNORM);
512
513 if (events & POLLHUP)
514 if ((tp->t_state & TS_CARR_ON) == 0)
515 revents |= POLLHUP;
516
517 if (revents == 0) {
518 if (events & (POLLIN | POLLRDNORM))
519 selrecord(p, &pti->pt_selr);
520
521 if (events & (POLLOUT | POLLWRNORM))
522 selrecord(p, &pti->pt_selw);
523 }
524 splx(s);
525
526 return (revents);
527}
528
529static int
530ptcwrite(dev, uio, flag)
531 dev_t dev;
532 register struct uio *uio;
533 int flag;
534{
535 register struct tty *tp = dev->si_tty;
536 register u_char *cp = 0;
537 register int cc = 0;
538 u_char locbuf[BUFSIZ];
539 int cnt = 0;
540 struct pt_ioctl *pti = dev->si_drv1;
541 int error = 0;
542
543again:
544 if ((tp->t_state&TS_ISOPEN) == 0)
545 goto block;
546 if (pti->pt_flags & PF_REMOTE) {
547 if (tp->t_canq.c_cc)
548 goto block;
549 while ((uio->uio_resid > 0 || cc > 0) &&
550 tp->t_canq.c_cc < TTYHOG - 1) {
551 if (cc == 0) {
552 cc = min(uio->uio_resid, BUFSIZ);
553 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
554 cp = locbuf;
555 error = uiomove((caddr_t)cp, cc, uio);
556 if (error)
557 return (error);
558 /* check again for safety */
559 if ((tp->t_state & TS_ISOPEN) == 0) {
560 /* adjust as usual */
561 uio->uio_resid += cc;
562 return (EIO);
563 }
564 }
565 if (cc > 0) {
566 cc = b_to_q((char *)cp, cc, &tp->t_canq);
567 /*
568 * XXX we don't guarantee that the canq size
569 * is >= TTYHOG, so the above b_to_q() may
570 * leave some bytes uncopied. However, space
571 * is guaranteed for the null terminator if
572 * we don't fail here since (TTYHOG - 1) is
573 * not a multiple of CBSIZE.
574 */
575 if (cc > 0)
576 break;
577 }
578 }
579 /* adjust for data copied in but not written */
580 uio->uio_resid += cc;
581 (void) putc(0, &tp->t_canq);
582 ttwakeup(tp);
583 wakeup(TSA_PTS_READ(tp));
584 return (0);
585 }
586 while (uio->uio_resid > 0 || cc > 0) {
587 if (cc == 0) {
588 cc = min(uio->uio_resid, BUFSIZ);
589 cp = locbuf;
590 error = uiomove((caddr_t)cp, cc, uio);
591 if (error)
592 return (error);
593 /* check again for safety */
594 if ((tp->t_state & TS_ISOPEN) == 0) {
595 /* adjust for data copied in but not written */
596 uio->uio_resid += cc;
597 return (EIO);
598 }
599 }
600 while (cc > 0) {
601 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
602 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) {
603 wakeup(TSA_HUP_OR_INPUT(tp));
604 goto block;
605 }
606 (*linesw[tp->t_line].l_rint)(*cp++, tp);
607 cnt++;
608 cc--;
609 }
610 cc = 0;
611 }
612 return (0);
613block:
614 /*
615 * Come here to wait for slave to open, for space
616 * in outq, or space in rawq, or an empty canq.
617 */
618 if ((tp->t_state & TS_CONNECTED) == 0) {
619 /* adjust for data copied in but not written */
620 uio->uio_resid += cc;
621 return (EIO);
622 }
623 if (flag & IO_NDELAY) {
624 /* adjust for data copied in but not written */
625 uio->uio_resid += cc;
626 if (cnt == 0)
627 return (EWOULDBLOCK);
628 return (0);
629 }
630 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
631 if (error) {
632 /* adjust for data copied in but not written */
633 uio->uio_resid += cc;
634 return (error);
635 }
636 goto again;
637}
638
639/*ARGSUSED*/
640static int
641ptyioctl(dev, cmd, data, flag, p)
642 dev_t dev;
643 u_long cmd;
644 caddr_t data;
645 int flag;
646 struct proc *p;
647{
648 register struct tty *tp = dev->si_tty;
649 register struct pt_ioctl *pti = dev->si_drv1;
650 register u_char *cc = tp->t_cc;
651 int stop, error;
652
653 if (devsw(dev)->d_open == ptcopen) {
654 switch (cmd) {
655
656 case TIOCGPGRP:
657 /*
658 * We avoid calling ttioctl on the controller since,
659 * in that case, tp must be the controlling terminal.
660 */
661 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
662 return (0);
663
664 case TIOCPKT:
665 if (*(int *)data) {
666 if (pti->pt_flags & PF_UCNTL)
667 return (EINVAL);
668 pti->pt_flags |= PF_PKT;
669 } else
670 pti->pt_flags &= ~PF_PKT;
671 return (0);
672
673 case TIOCUCNTL:
674 if (*(int *)data) {
675 if (pti->pt_flags & PF_PKT)
676 return (EINVAL);
677 pti->pt_flags |= PF_UCNTL;
678 } else
679 pti->pt_flags &= ~PF_UCNTL;
680 return (0);
681
682 case TIOCREMOTE:
683 if (*(int *)data)
684 pti->pt_flags |= PF_REMOTE;
685 else
686 pti->pt_flags &= ~PF_REMOTE;
687 ttyflush(tp, FREAD|FWRITE);
688 return (0);
689 }
690
691 /*
692 * The rest of the ioctls shouldn't be called until
693 * the slave is open.
694 */
695 if ((tp->t_state & TS_ISOPEN) == 0)
696 return (EAGAIN);
697
698 switch (cmd) {
699#ifdef COMPAT_43
700 case TIOCSETP:
701 case TIOCSETN:
702#endif
703 case TIOCSETD:
704 case TIOCSETA:
705 case TIOCSETAW:
706 case TIOCSETAF:
707 /*
708 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
709 * ttywflush(tp) will hang if there are characters in
710 * the outq.
711 */
712 ndflush(&tp->t_outq, tp->t_outq.c_cc);
713 break;
714
715 case TIOCSIG:
716 if (*(unsigned int *)data >= NSIG ||
717 *(unsigned int *)data == 0)
718 return(EINVAL);
719 if ((tp->t_lflag&NOFLSH) == 0)
720 ttyflush(tp, FREAD|FWRITE);
721 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
722 if ((*(unsigned int *)data == SIGINFO) &&
723 ((tp->t_lflag&NOKERNINFO) == 0))
724 ttyinfo(tp);
725 return(0);
726 }
727 }
728 if (cmd == TIOCEXT) {
729 /*
730 * When the EXTPROC bit is being toggled, we need
731 * to send an TIOCPKT_IOCTL if the packet driver
732 * is turned on.
733 */
734 if (*(int *)data) {
735 if (pti->pt_flags & PF_PKT) {
736 pti->pt_send |= TIOCPKT_IOCTL;
737 ptcwakeup(tp, FREAD);
738 }
739 tp->t_lflag |= EXTPROC;
740 } else {
741 if ((tp->t_lflag & EXTPROC) &&
742 (pti->pt_flags & PF_PKT)) {
743 pti->pt_send |= TIOCPKT_IOCTL;
744 ptcwakeup(tp, FREAD);
745 }
746 tp->t_lflag &= ~EXTPROC;
747 }
748 return(0);
749 }
750 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
751 if (error == ENOIOCTL)
752 error = ttioctl(tp, cmd, data, flag);
753 if (error == ENOIOCTL) {
754 if (pti->pt_flags & PF_UCNTL &&
755 (cmd & ~0xff) == UIOCCMD(0)) {
756 if (cmd & 0xff) {
757 pti->pt_ucntl = (u_char)cmd;
758 ptcwakeup(tp, FREAD);
759 }
760 return (0);
761 }
762 error = ENOTTY;
763 }
764 /*
765 * If external processing and packet mode send ioctl packet.
766 */
767 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
768 switch(cmd) {
769 case TIOCSETA:
770 case TIOCSETAW:
771 case TIOCSETAF:
772#ifdef COMPAT_43
773 case TIOCSETP:
774 case TIOCSETN:
775#endif
776#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
777 case TIOCSETC:
778 case TIOCSLTC:
779 case TIOCLBIS:
780 case TIOCLBIC:
781 case TIOCLSET:
782#endif
783 pti->pt_send |= TIOCPKT_IOCTL;
784 ptcwakeup(tp, FREAD);
785 default:
786 break;
787 }
788 }
789 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
790 && CCEQ(cc[VSTART], CTRL('q'));
791 if (pti->pt_flags & PF_NOSTOP) {
792 if (stop) {
793 pti->pt_send &= ~TIOCPKT_NOSTOP;
794 pti->pt_send |= TIOCPKT_DOSTOP;
795 pti->pt_flags &= ~PF_NOSTOP;
796 ptcwakeup(tp, FREAD);
797 }
798 } else {
799 if (!stop) {
800 pti->pt_send &= ~TIOCPKT_DOSTOP;
801 pti->pt_send |= TIOCPKT_NOSTOP;
802 pti->pt_flags |= PF_NOSTOP;
803 ptcwakeup(tp, FREAD);
804 }
805 }
806 return (error);
807}
808
809
810static void ptc_drvinit __P((void *unused));
811
812static void
813ptc_drvinit(unused)
814 void *unused;
815{
816 cdevsw_add(&pts_cdevsw);
817 cdevsw_add(&ptc_cdevsw);
818 /* XXX: Gross hack for DEVFS */
819 ptyinit(0);
820}
821
822SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)
| 364 pti->pt_flags = 0;
365 pti->pt_send = 0;
366 pti->pt_ucntl = 0;
367 return (0);
368}
369
370static int
371ptcclose(dev, flags, fmt, p)
372 dev_t dev;
373 int flags;
374 int fmt;
375 struct proc *p;
376{
377 register struct tty *tp;
378
379 tp = dev->si_tty;
380 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
381
382 /*
383 * XXX MDMBUF makes no sense for ptys but would inhibit the above
384 * l_modem(). CLOCAL makes sense but isn't supported. Special
385 * l_modem()s that ignore carrier drop make no sense for ptys but
386 * may be in use because other parts of the line discipline make
387 * sense for ptys. Recover by doing everything that a normal
388 * ttymodem() would have done except for sending a SIGHUP.
389 */
390 if (tp->t_state & TS_ISOPEN) {
391 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
392 tp->t_state |= TS_ZOMBIE;
393 ttyflush(tp, FREAD | FWRITE);
394 }
395
396 tp->t_oproc = 0; /* mark closed */
397 return (0);
398}
399
400static int
401ptcread(dev, uio, flag)
402 dev_t dev;
403 struct uio *uio;
404 int flag;
405{
406 register struct tty *tp = dev->si_tty;
407 struct pt_ioctl *pti = dev->si_drv1;
408 char buf[BUFSIZ];
409 int error = 0, cc;
410
411 /*
412 * We want to block until the slave
413 * is open, and there's something to read;
414 * but if we lost the slave or we're NBIO,
415 * then return the appropriate error instead.
416 */
417 for (;;) {
418 if (tp->t_state&TS_ISOPEN) {
419 if (pti->pt_flags&PF_PKT && pti->pt_send) {
420 error = ureadc((int)pti->pt_send, uio);
421 if (error)
422 return (error);
423 if (pti->pt_send & TIOCPKT_IOCTL) {
424 cc = min(uio->uio_resid,
425 sizeof(tp->t_termios));
426 uiomove((caddr_t)&tp->t_termios, cc,
427 uio);
428 }
429 pti->pt_send = 0;
430 return (0);
431 }
432 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
433 error = ureadc((int)pti->pt_ucntl, uio);
434 if (error)
435 return (error);
436 pti->pt_ucntl = 0;
437 return (0);
438 }
439 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
440 break;
441 }
442 if ((tp->t_state & TS_CONNECTED) == 0)
443 return (0); /* EOF */
444 if (flag & IO_NDELAY)
445 return (EWOULDBLOCK);
446 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
447 if (error)
448 return (error);
449 }
450 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
451 error = ureadc(0, uio);
452 while (uio->uio_resid > 0 && error == 0) {
453 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
454 if (cc <= 0)
455 break;
456 error = uiomove(buf, cc, uio);
457 }
458 ttwwakeup(tp);
459 return (error);
460}
461
462static void
463ptsstop(tp, flush)
464 register struct tty *tp;
465 int flush;
466{
467 struct pt_ioctl *pti = tp->t_dev->si_drv1;
468 int flag;
469
470 /* note: FLUSHREAD and FLUSHWRITE already ok */
471 if (flush == 0) {
472 flush = TIOCPKT_STOP;
473 pti->pt_flags |= PF_STOPPED;
474 } else
475 pti->pt_flags &= ~PF_STOPPED;
476 pti->pt_send |= flush;
477 /* change of perspective */
478 flag = 0;
479 if (flush & FREAD)
480 flag |= FWRITE;
481 if (flush & FWRITE)
482 flag |= FREAD;
483 ptcwakeup(tp, flag);
484}
485
486static int
487ptcpoll(dev, events, p)
488 dev_t dev;
489 int events;
490 struct proc *p;
491{
492 register struct tty *tp = dev->si_tty;
493 struct pt_ioctl *pti = dev->si_drv1;
494 int revents = 0;
495 int s;
496
497 if ((tp->t_state & TS_CONNECTED) == 0)
498 return (seltrue(dev, events, p) | POLLHUP);
499
500 /*
501 * Need to block timeouts (ttrstart).
502 */
503 s = spltty();
504
505 if (events & (POLLIN | POLLRDNORM))
506 if ((tp->t_state & TS_ISOPEN) &&
507 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
508 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
509 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
510 revents |= events & (POLLIN | POLLRDNORM);
511
512 if (events & (POLLOUT | POLLWRNORM))
513 if (tp->t_state & TS_ISOPEN &&
514 ((pti->pt_flags & PF_REMOTE) ?
515 (tp->t_canq.c_cc == 0) :
516 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
517 (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON)))))
518 revents |= events & (POLLOUT | POLLWRNORM);
519
520 if (events & POLLHUP)
521 if ((tp->t_state & TS_CARR_ON) == 0)
522 revents |= POLLHUP;
523
524 if (revents == 0) {
525 if (events & (POLLIN | POLLRDNORM))
526 selrecord(p, &pti->pt_selr);
527
528 if (events & (POLLOUT | POLLWRNORM))
529 selrecord(p, &pti->pt_selw);
530 }
531 splx(s);
532
533 return (revents);
534}
535
536static int
537ptcwrite(dev, uio, flag)
538 dev_t dev;
539 register struct uio *uio;
540 int flag;
541{
542 register struct tty *tp = dev->si_tty;
543 register u_char *cp = 0;
544 register int cc = 0;
545 u_char locbuf[BUFSIZ];
546 int cnt = 0;
547 struct pt_ioctl *pti = dev->si_drv1;
548 int error = 0;
549
550again:
551 if ((tp->t_state&TS_ISOPEN) == 0)
552 goto block;
553 if (pti->pt_flags & PF_REMOTE) {
554 if (tp->t_canq.c_cc)
555 goto block;
556 while ((uio->uio_resid > 0 || cc > 0) &&
557 tp->t_canq.c_cc < TTYHOG - 1) {
558 if (cc == 0) {
559 cc = min(uio->uio_resid, BUFSIZ);
560 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
561 cp = locbuf;
562 error = uiomove((caddr_t)cp, cc, uio);
563 if (error)
564 return (error);
565 /* check again for safety */
566 if ((tp->t_state & TS_ISOPEN) == 0) {
567 /* adjust as usual */
568 uio->uio_resid += cc;
569 return (EIO);
570 }
571 }
572 if (cc > 0) {
573 cc = b_to_q((char *)cp, cc, &tp->t_canq);
574 /*
575 * XXX we don't guarantee that the canq size
576 * is >= TTYHOG, so the above b_to_q() may
577 * leave some bytes uncopied. However, space
578 * is guaranteed for the null terminator if
579 * we don't fail here since (TTYHOG - 1) is
580 * not a multiple of CBSIZE.
581 */
582 if (cc > 0)
583 break;
584 }
585 }
586 /* adjust for data copied in but not written */
587 uio->uio_resid += cc;
588 (void) putc(0, &tp->t_canq);
589 ttwakeup(tp);
590 wakeup(TSA_PTS_READ(tp));
591 return (0);
592 }
593 while (uio->uio_resid > 0 || cc > 0) {
594 if (cc == 0) {
595 cc = min(uio->uio_resid, BUFSIZ);
596 cp = locbuf;
597 error = uiomove((caddr_t)cp, cc, uio);
598 if (error)
599 return (error);
600 /* check again for safety */
601 if ((tp->t_state & TS_ISOPEN) == 0) {
602 /* adjust for data copied in but not written */
603 uio->uio_resid += cc;
604 return (EIO);
605 }
606 }
607 while (cc > 0) {
608 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
609 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) {
610 wakeup(TSA_HUP_OR_INPUT(tp));
611 goto block;
612 }
613 (*linesw[tp->t_line].l_rint)(*cp++, tp);
614 cnt++;
615 cc--;
616 }
617 cc = 0;
618 }
619 return (0);
620block:
621 /*
622 * Come here to wait for slave to open, for space
623 * in outq, or space in rawq, or an empty canq.
624 */
625 if ((tp->t_state & TS_CONNECTED) == 0) {
626 /* adjust for data copied in but not written */
627 uio->uio_resid += cc;
628 return (EIO);
629 }
630 if (flag & IO_NDELAY) {
631 /* adjust for data copied in but not written */
632 uio->uio_resid += cc;
633 if (cnt == 0)
634 return (EWOULDBLOCK);
635 return (0);
636 }
637 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
638 if (error) {
639 /* adjust for data copied in but not written */
640 uio->uio_resid += cc;
641 return (error);
642 }
643 goto again;
644}
645
646/*ARGSUSED*/
647static int
648ptyioctl(dev, cmd, data, flag, p)
649 dev_t dev;
650 u_long cmd;
651 caddr_t data;
652 int flag;
653 struct proc *p;
654{
655 register struct tty *tp = dev->si_tty;
656 register struct pt_ioctl *pti = dev->si_drv1;
657 register u_char *cc = tp->t_cc;
658 int stop, error;
659
660 if (devsw(dev)->d_open == ptcopen) {
661 switch (cmd) {
662
663 case TIOCGPGRP:
664 /*
665 * We avoid calling ttioctl on the controller since,
666 * in that case, tp must be the controlling terminal.
667 */
668 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
669 return (0);
670
671 case TIOCPKT:
672 if (*(int *)data) {
673 if (pti->pt_flags & PF_UCNTL)
674 return (EINVAL);
675 pti->pt_flags |= PF_PKT;
676 } else
677 pti->pt_flags &= ~PF_PKT;
678 return (0);
679
680 case TIOCUCNTL:
681 if (*(int *)data) {
682 if (pti->pt_flags & PF_PKT)
683 return (EINVAL);
684 pti->pt_flags |= PF_UCNTL;
685 } else
686 pti->pt_flags &= ~PF_UCNTL;
687 return (0);
688
689 case TIOCREMOTE:
690 if (*(int *)data)
691 pti->pt_flags |= PF_REMOTE;
692 else
693 pti->pt_flags &= ~PF_REMOTE;
694 ttyflush(tp, FREAD|FWRITE);
695 return (0);
696 }
697
698 /*
699 * The rest of the ioctls shouldn't be called until
700 * the slave is open.
701 */
702 if ((tp->t_state & TS_ISOPEN) == 0)
703 return (EAGAIN);
704
705 switch (cmd) {
706#ifdef COMPAT_43
707 case TIOCSETP:
708 case TIOCSETN:
709#endif
710 case TIOCSETD:
711 case TIOCSETA:
712 case TIOCSETAW:
713 case TIOCSETAF:
714 /*
715 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
716 * ttywflush(tp) will hang if there are characters in
717 * the outq.
718 */
719 ndflush(&tp->t_outq, tp->t_outq.c_cc);
720 break;
721
722 case TIOCSIG:
723 if (*(unsigned int *)data >= NSIG ||
724 *(unsigned int *)data == 0)
725 return(EINVAL);
726 if ((tp->t_lflag&NOFLSH) == 0)
727 ttyflush(tp, FREAD|FWRITE);
728 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
729 if ((*(unsigned int *)data == SIGINFO) &&
730 ((tp->t_lflag&NOKERNINFO) == 0))
731 ttyinfo(tp);
732 return(0);
733 }
734 }
735 if (cmd == TIOCEXT) {
736 /*
737 * When the EXTPROC bit is being toggled, we need
738 * to send an TIOCPKT_IOCTL if the packet driver
739 * is turned on.
740 */
741 if (*(int *)data) {
742 if (pti->pt_flags & PF_PKT) {
743 pti->pt_send |= TIOCPKT_IOCTL;
744 ptcwakeup(tp, FREAD);
745 }
746 tp->t_lflag |= EXTPROC;
747 } else {
748 if ((tp->t_lflag & EXTPROC) &&
749 (pti->pt_flags & PF_PKT)) {
750 pti->pt_send |= TIOCPKT_IOCTL;
751 ptcwakeup(tp, FREAD);
752 }
753 tp->t_lflag &= ~EXTPROC;
754 }
755 return(0);
756 }
757 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
758 if (error == ENOIOCTL)
759 error = ttioctl(tp, cmd, data, flag);
760 if (error == ENOIOCTL) {
761 if (pti->pt_flags & PF_UCNTL &&
762 (cmd & ~0xff) == UIOCCMD(0)) {
763 if (cmd & 0xff) {
764 pti->pt_ucntl = (u_char)cmd;
765 ptcwakeup(tp, FREAD);
766 }
767 return (0);
768 }
769 error = ENOTTY;
770 }
771 /*
772 * If external processing and packet mode send ioctl packet.
773 */
774 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
775 switch(cmd) {
776 case TIOCSETA:
777 case TIOCSETAW:
778 case TIOCSETAF:
779#ifdef COMPAT_43
780 case TIOCSETP:
781 case TIOCSETN:
782#endif
783#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
784 case TIOCSETC:
785 case TIOCSLTC:
786 case TIOCLBIS:
787 case TIOCLBIC:
788 case TIOCLSET:
789#endif
790 pti->pt_send |= TIOCPKT_IOCTL;
791 ptcwakeup(tp, FREAD);
792 default:
793 break;
794 }
795 }
796 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
797 && CCEQ(cc[VSTART], CTRL('q'));
798 if (pti->pt_flags & PF_NOSTOP) {
799 if (stop) {
800 pti->pt_send &= ~TIOCPKT_NOSTOP;
801 pti->pt_send |= TIOCPKT_DOSTOP;
802 pti->pt_flags &= ~PF_NOSTOP;
803 ptcwakeup(tp, FREAD);
804 }
805 } else {
806 if (!stop) {
807 pti->pt_send &= ~TIOCPKT_DOSTOP;
808 pti->pt_send |= TIOCPKT_NOSTOP;
809 pti->pt_flags |= PF_NOSTOP;
810 ptcwakeup(tp, FREAD);
811 }
812 }
813 return (error);
814}
815
816
817static void ptc_drvinit __P((void *unused));
818
819static void
820ptc_drvinit(unused)
821 void *unused;
822{
823 cdevsw_add(&pts_cdevsw);
824 cdevsw_add(&ptc_cdevsw);
825 /* XXX: Gross hack for DEVFS */
826 ptyinit(0);
827}
828
829SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)
|