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sdiff udiff text old ( 111741 ) new ( 111742 )
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pty.c (111741) pty.c (111742)
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

--- 17 unchanged lines hidden (view full) ---

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

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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 111741 2003-03-02 15:50:23Z des $
34 * $FreeBSD: head/sys/kern/tty_pty.c 111742 2003-03-02 15:56:49Z des $
35 */
36
37/*
38 * Pseudo-teletype Driver
39 * (Actually two drivers, requiring two entries in 'cdevsw')
40 */
41#include "opt_compat.h"
42#include <sys/param.h>

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131
132static char *names = "pqrsPQRS";
133/*
134 * This function creates and initializes a pts/ptc pair
135 *
136 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
137 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
138 *
35 */
36
37/*
38 * Pseudo-teletype Driver
39 * (Actually two drivers, requiring two entries in 'cdevsw')
40 */
41#include "opt_compat.h"
42#include <sys/param.h>

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131
132static char *names = "pqrsPQRS";
133/*
134 * This function creates and initializes a pts/ptc pair
135 *
136 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
137 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
138 *
139 * XXX: define and add mapping of upper minor bits to allow more
139 * XXX: define and add mapping of upper minor bits to allow more
140 * than 256 ptys.
141 */
142static dev_t
143ptyinit(dev_t devc)
144{
145 dev_t devs;
146 struct pt_ioctl *pt;
147 int n;

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167
168/*ARGSUSED*/
169static int
170ptsopen(dev, flag, devtype, td)
171 dev_t dev;
172 int flag, devtype;
173 struct thread *td;
174{
140 * than 256 ptys.
141 */
142static dev_t
143ptyinit(dev_t devc)
144{
145 dev_t devs;
146 struct pt_ioctl *pt;
147 int n;

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167
168/*ARGSUSED*/
169static int
170ptsopen(dev, flag, devtype, td)
171 dev_t dev;
172 int flag, devtype;
173 struct thread *td;
174{
175 register struct tty *tp;
175 struct tty *tp;
176 int error;
177 struct pt_ioctl *pti;
178
179 if (!dev->si_drv1)
176 int error;
177 struct pt_ioctl *pti;
178
179 if (!dev->si_drv1)
180 return(ENXIO);
180 return(ENXIO);
181 pti = dev->si_drv1;
182 tp = dev->si_tty;
183 if ((tp->t_state & TS_ISOPEN) == 0) {
184 ttychars(tp); /* Set up default chars */
185 tp->t_iflag = TTYDEF_IFLAG;
186 tp->t_oflag = TTYDEF_OFLAG;
187 tp->t_lflag = TTYDEF_LFLAG;
188 tp->t_cflag = TTYDEF_CFLAG;

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209}
210
211static int
212ptsclose(dev, flag, mode, td)
213 dev_t dev;
214 int flag, mode;
215 struct thread *td;
216{
181 pti = dev->si_drv1;
182 tp = dev->si_tty;
183 if ((tp->t_state & TS_ISOPEN) == 0) {
184 ttychars(tp); /* Set up default chars */
185 tp->t_iflag = TTYDEF_IFLAG;
186 tp->t_oflag = TTYDEF_OFLAG;
187 tp->t_lflag = TTYDEF_LFLAG;
188 tp->t_cflag = TTYDEF_CFLAG;

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209}
210
211static int
212ptsclose(dev, flag, mode, td)
213 dev_t dev;
214 int flag, mode;
215 struct thread *td;
216{
217 register struct tty *tp;
217 struct tty *tp;
218 int err;
219
220 tp = dev->si_tty;
221 err = (*linesw[tp->t_line].l_close)(tp, flag);
222 ptsstop(tp, FREAD|FWRITE);
223 (void) ttyclose(tp);
224 return (err);
225}
226
227static int
228ptsread(dev, uio, flag)
229 dev_t dev;
230 struct uio *uio;
231 int flag;
232{
233 struct thread *td = curthread;
234 struct proc *p = td->td_proc;
218 int err;
219
220 tp = dev->si_tty;
221 err = (*linesw[tp->t_line].l_close)(tp, flag);
222 ptsstop(tp, FREAD|FWRITE);
223 (void) ttyclose(tp);
224 return (err);
225}
226
227static int
228ptsread(dev, uio, flag)
229 dev_t dev;
230 struct uio *uio;
231 int flag;
232{
233 struct thread *td = curthread;
234 struct proc *p = td->td_proc;
235 register struct tty *tp = dev->si_tty;
236 register struct pt_ioctl *pti = dev->si_drv1;
235 struct tty *tp = dev->si_tty;
236 struct pt_ioctl *pti = dev->si_drv1;
237 struct pgrp *pg;
238 int error = 0;
239
240again:
241 if (pti->pt_flags & PF_REMOTE) {
242 while (isbackground(p, tp)) {
243 sx_slock(&proctree_lock);
244 PROC_LOCK(p);

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291 * indirectly, when tty driver calls ptsstart.
292 */
293static int
294ptswrite(dev, uio, flag)
295 dev_t dev;
296 struct uio *uio;
297 int flag;
298{
237 struct pgrp *pg;
238 int error = 0;
239
240again:
241 if (pti->pt_flags & PF_REMOTE) {
242 while (isbackground(p, tp)) {
243 sx_slock(&proctree_lock);
244 PROC_LOCK(p);

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291 * indirectly, when tty driver calls ptsstart.
292 */
293static int
294ptswrite(dev, uio, flag)
295 dev_t dev;
296 struct uio *uio;
297 int flag;
298{
299 register struct tty *tp;
299 struct tty *tp;
300
301 tp = dev->si_tty;
302 if (tp->t_oproc == 0)
303 return (EIO);
304 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
305}
306
307/*
308 * Start output on pseudo-tty.
309 * Wake up process selecting or sleeping for input from controlling tty.
310 */
311static void
312ptsstart(tp)
313 struct tty *tp;
314{
300
301 tp = dev->si_tty;
302 if (tp->t_oproc == 0)
303 return (EIO);
304 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
305}
306
307/*
308 * Start output on pseudo-tty.
309 * Wake up process selecting or sleeping for input from controlling tty.
310 */
311static void
312ptsstart(tp)
313 struct tty *tp;
314{
315 register struct pt_ioctl *pti = tp->t_dev->si_drv1;
315 struct pt_ioctl *pti = tp->t_dev->si_drv1;
316
317 if (tp->t_state & TS_TTSTOP)
318 return;
319 if (pti->pt_flags & PF_STOPPED) {
320 pti->pt_flags &= ~PF_STOPPED;
321 pti->pt_send = TIOCPKT_START;
322 }
323 ptcwakeup(tp, FREAD);

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341}
342
343static int
344ptcopen(dev, flag, devtype, td)
345 dev_t dev;
346 int flag, devtype;
347 struct thread *td;
348{
316
317 if (tp->t_state & TS_TTSTOP)
318 return;
319 if (pti->pt_flags & PF_STOPPED) {
320 pti->pt_flags &= ~PF_STOPPED;
321 pti->pt_send = TIOCPKT_START;
322 }
323 ptcwakeup(tp, FREAD);

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341}
342
343static int
344ptcopen(dev, flag, devtype, td)
345 dev_t dev;
346 int flag, devtype;
347 struct thread *td;
348{
349 register struct tty *tp;
349 struct tty *tp;
350 struct pt_ioctl *pti;
351
352 if (!dev->si_drv1)
353 ptyinit(dev);
354 if (!dev->si_drv1)
350 struct pt_ioctl *pti;
351
352 if (!dev->si_drv1)
353 ptyinit(dev);
354 if (!dev->si_drv1)
355 return(ENXIO);
355 return(ENXIO);
356 tp = dev->si_tty;
357 if (tp->t_oproc)
358 return (EIO);
359 tp->t_timeout = -1;
360 tp->t_oproc = ptsstart;
361 tp->t_stop = ptsstop;
362 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
363 tp->t_lflag &= ~EXTPROC;

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371
372static int
373ptcclose(dev, flags, fmt, td)
374 dev_t dev;
375 int flags;
376 int fmt;
377 struct thread *td;
378{
356 tp = dev->si_tty;
357 if (tp->t_oproc)
358 return (EIO);
359 tp->t_timeout = -1;
360 tp->t_oproc = ptsstart;
361 tp->t_stop = ptsstop;
362 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
363 tp->t_lflag &= ~EXTPROC;

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371
372static int
373ptcclose(dev, flags, fmt, td)
374 dev_t dev;
375 int flags;
376 int fmt;
377 struct thread *td;
378{
379 register struct tty *tp;
379 struct tty *tp;
380
381 tp = dev->si_tty;
382 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
383
384 /*
385 * XXX MDMBUF makes no sense for ptys but would inhibit the above
386 * l_modem(). CLOCAL makes sense but isn't supported. Special
387 * l_modem()s that ignore carrier drop make no sense for ptys but

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400}
401
402static int
403ptcread(dev, uio, flag)
404 dev_t dev;
405 struct uio *uio;
406 int flag;
407{
380
381 tp = dev->si_tty;
382 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
383
384 /*
385 * XXX MDMBUF makes no sense for ptys but would inhibit the above
386 * l_modem(). CLOCAL makes sense but isn't supported. Special
387 * l_modem()s that ignore carrier drop make no sense for ptys but

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400}
401
402static int
403ptcread(dev, uio, flag)
404 dev_t dev;
405 struct uio *uio;
406 int flag;
407{
408 register struct tty *tp = dev->si_tty;
408 struct tty *tp = dev->si_tty;
409 struct pt_ioctl *pti = dev->si_drv1;
410 char buf[BUFSIZ];
411 int error = 0, cc;
412
413 /*
414 * We want to block until the slave
415 * is open, and there's something to read;
416 * but if we lost the slave or we're NBIO,

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457 error = uiomove(buf, cc, uio);
458 }
459 ttwwakeup(tp);
460 return (error);
461}
462
463static void
464ptsstop(tp, flush)
409 struct pt_ioctl *pti = dev->si_drv1;
410 char buf[BUFSIZ];
411 int error = 0, cc;
412
413 /*
414 * We want to block until the slave
415 * is open, and there's something to read;
416 * but if we lost the slave or we're NBIO,

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457 error = uiomove(buf, cc, uio);
458 }
459 ttwwakeup(tp);
460 return (error);
461}
462
463static void
464ptsstop(tp, flush)
465 register struct tty *tp;
465 struct tty *tp;
466 int flush;
467{
468 struct pt_ioctl *pti = tp->t_dev->si_drv1;
469 int flag;
470
471 /* note: FLUSHREAD and FLUSHWRITE already ok */
472 if (flush == 0) {
473 flush = TIOCPKT_STOP;

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485}
486
487static int
488ptcpoll(dev, events, td)
489 dev_t dev;
490 int events;
491 struct thread *td;
492{
466 int flush;
467{
468 struct pt_ioctl *pti = tp->t_dev->si_drv1;
469 int flag;
470
471 /* note: FLUSHREAD and FLUSHWRITE already ok */
472 if (flush == 0) {
473 flush = TIOCPKT_STOP;

--- 11 unchanged lines hidden (view full) ---

485}
486
487static int
488ptcpoll(dev, events, td)
489 dev_t dev;
490 int events;
491 struct thread *td;
492{
493 register struct tty *tp = dev->si_tty;
493 struct tty *tp = dev->si_tty;
494 struct pt_ioctl *pti = dev->si_drv1;
495 int revents = 0;
496 int s;
497
498 if ((tp->t_state & TS_CONNECTED) == 0)
499 return (seltrue(dev, events, td) | POLLHUP);
500
501 /*

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508 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
509 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
510 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
511 revents |= events & (POLLIN | POLLRDNORM);
512
513 if (events & (POLLOUT | POLLWRNORM))
514 if (tp->t_state & TS_ISOPEN &&
515 ((pti->pt_flags & PF_REMOTE) ?
494 struct pt_ioctl *pti = dev->si_drv1;
495 int revents = 0;
496 int s;
497
498 if ((tp->t_state & TS_CONNECTED) == 0)
499 return (seltrue(dev, events, td) | POLLHUP);
500
501 /*

--- 6 unchanged lines hidden (view full) ---

508 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
509 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
510 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
511 revents |= events & (POLLIN | POLLRDNORM);
512
513 if (events & (POLLOUT | POLLWRNORM))
514 if (tp->t_state & TS_ISOPEN &&
515 ((pti->pt_flags & PF_REMOTE) ?
516 (tp->t_canq.c_cc == 0) :
516 (tp->t_canq.c_cc == 0) :
517 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
518 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
519 revents |= events & (POLLOUT | POLLWRNORM);
520
521 if (events & POLLHUP)
522 if ((tp->t_state & TS_CARR_ON) == 0)
523 revents |= POLLHUP;
524
525 if (revents == 0) {
526 if (events & (POLLIN | POLLRDNORM))
527 selrecord(td, &pti->pt_selr);
528
517 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
518 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
519 revents |= events & (POLLOUT | POLLWRNORM);
520
521 if (events & POLLHUP)
522 if ((tp->t_state & TS_CARR_ON) == 0)
523 revents |= POLLHUP;
524
525 if (revents == 0) {
526 if (events & (POLLIN | POLLRDNORM))
527 selrecord(td, &pti->pt_selr);
528
529 if (events & (POLLOUT | POLLWRNORM))
529 if (events & (POLLOUT | POLLWRNORM))
530 selrecord(td, &pti->pt_selw);
531 }
532 splx(s);
533
534 return (revents);
535}
536
537static int
538ptcwrite(dev, uio, flag)
539 dev_t dev;
530 selrecord(td, &pti->pt_selw);
531 }
532 splx(s);
533
534 return (revents);
535}
536
537static int
538ptcwrite(dev, uio, flag)
539 dev_t dev;
540 register struct uio *uio;
540 struct uio *uio;
541 int flag;
542{
541 int flag;
542{
543 register struct tty *tp = dev->si_tty;
544 register u_char *cp = 0;
545 register int cc = 0;
543 struct tty *tp = dev->si_tty;
544 u_char *cp = 0;
545 int cc = 0;
546 u_char locbuf[BUFSIZ];
547 int cnt = 0;
548 struct pt_ioctl *pti = dev->si_drv1;
549 int error = 0;
550
551again:
552 if ((tp->t_state&TS_ISOPEN) == 0)
553 goto block;

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648static int
649ptyioctl(dev, cmd, data, flag, td)
650 dev_t dev;
651 u_long cmd;
652 caddr_t data;
653 int flag;
654 struct thread *td;
655{
546 u_char locbuf[BUFSIZ];
547 int cnt = 0;
548 struct pt_ioctl *pti = dev->si_drv1;
549 int error = 0;
550
551again:
552 if ((tp->t_state&TS_ISOPEN) == 0)
553 goto block;

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648static int
649ptyioctl(dev, cmd, data, flag, td)
650 dev_t dev;
651 u_long cmd;
652 caddr_t data;
653 int flag;
654 struct thread *td;
655{
656 register struct tty *tp = dev->si_tty;
657 register struct pt_ioctl *pti = dev->si_drv1;
658 register u_char *cc = tp->t_cc;
656 struct tty *tp = dev->si_tty;
657 struct pt_ioctl *pti = dev->si_drv1;
658 u_char *cc = tp->t_cc;
659 int stop, error;
660
661 if (devsw(dev)->d_open == ptcopen) {
662 switch (cmd) {
663
664 case TIOCGPGRP:
665 /*
666 * We avoid calling ttioctl on the controller since,

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692 pti->pt_flags |= PF_REMOTE;
693 else
694 pti->pt_flags &= ~PF_REMOTE;
695 ttyflush(tp, FREAD|FWRITE);
696 return (0);
697 }
698
699 /*
659 int stop, error;
660
661 if (devsw(dev)->d_open == ptcopen) {
662 switch (cmd) {
663
664 case TIOCGPGRP:
665 /*
666 * We avoid calling ttioctl on the controller since,

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692 pti->pt_flags |= PF_REMOTE;
693 else
694 pti->pt_flags &= ~PF_REMOTE;
695 ttyflush(tp, FREAD|FWRITE);
696 return (0);
697 }
698
699 /*
700 * The rest of the ioctls shouldn't be called until
700 * The rest of the ioctls shouldn't be called until
701 * the slave is open.
702 */
703 if ((tp->t_state & TS_ISOPEN) == 0)
704 return (EAGAIN);
705
706 switch (cmd) {
707#ifdef COMPAT_43
708 case TIOCSETP:

--- 164 unchanged lines hidden --- 		701 * the slave is open.
702 */
703 if ((tp->t_state & TS_ISOPEN) == 0)
704 return (EAGAIN);
705
706 switch (cmd) {
707#ifdef COMPAT_43
708 case TIOCSETP:

--- 164 unchanged lines hidden ---