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33 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
34 * $FreeBSD: src/sys/kern/tty_pty.c,v 1.74.2.4 2002/02/20 19:58:13 dillon Exp $
35 * $DragonFly: src/sys/kern/tty_pty.c,v 1.21 2008/08/13 10:29:38 swildner Exp $
39 * Pseudo-teletype Driver
40 * (Actually two drivers, requiring two dev_ops structures)
42 #include "use_pty.h" /* XXX */
43 #include "opt_compat.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
48 #include <sys/ioctl_compat.h>
54 #include <sys/fcntl.h>
55 #include <sys/kernel.h>
56 #include <sys/vnode.h>
57 #include <sys/signalvar.h>
58 #include <sys/malloc.h>
59 #include <sys/device.h>
60 #include <sys/thread2.h>
61 #include <sys/devfs.h>
63 #include <sys/sysctl.h>
67 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
69 static void ptsstart (struct tty *tp);
70 static void ptsstop (struct tty *tp, int rw);
71 static void ptcwakeup (struct tty *tp, int flag);
72 static void ptyinit (int n);
73 static int filt_ptcread (struct knote *kn, long hint);
74 static void filt_ptcrdetach (struct knote *kn);
75 static int filt_ptcwrite (struct knote *kn, long hint);
76 static void filt_ptcwdetach (struct knote *kn);
78 static d_open_t ptsopen;
79 static d_close_t ptsclose;
80 static d_read_t ptsread;
81 static d_write_t ptswrite;
82 static d_ioctl_t ptyioctl;
83 static d_open_t ptcopen;
84 static d_close_t ptcclose;
85 static d_read_t ptcread;
86 static d_write_t ptcwrite;
87 static d_kqfilter_t ptckqfilter;
90 DEVFS_DECLARE_CLONE_BITMAP(pty);
92 static d_clone_t ptyclone;
94 static int pty_debug_level = 0;
96 static struct dev_ops pts98_ops = {
97 { "pts98", 0, D_TTY | D_KQFILTER },
103 .d_kqfilter = ttykqfilter,
104 .d_revoke = ttyrevoke
107 static struct dev_ops ptc98_ops = {
108 { "ptc98", 0, D_TTY | D_KQFILTER | D_MASTER },
114 .d_kqfilter = ptckqfilter,
115 .d_revoke = ttyrevoke
119 #define CDEV_MAJOR_S 5
120 static struct dev_ops pts_ops = {
121 { "pts", CDEV_MAJOR_S, D_TTY | D_KQFILTER },
127 .d_kqfilter = ttykqfilter,
128 .d_revoke = ttyrevoke
131 #define CDEV_MAJOR_C 6
132 static struct dev_ops ptc_ops = {
133 { "ptc", CDEV_MAJOR_C, D_TTY | D_KQFILTER | D_MASTER },
139 .d_kqfilter = ptckqfilter,
140 .d_revoke = ttyrevoke
143 #define BUFSIZ 100 /* Chunk size iomoved to/from user */
148 struct selinfo pt_selr, pt_selw;
153 struct prison *pt_prison;
156 #define PF_PKT 0x08 /* packet mode */
157 #define PF_STOPPED 0x10 /* user told stopped */
158 #define PF_REMOTE 0x20 /* remote and flow controlled input */
159 #define PF_NOSTOP 0x40
160 #define PF_UCNTL 0x80 /* user control mode */
162 #define PF_UNIX98 0x01
163 #define PF_SOPEN 0x02
164 #define PF_MOPEN 0x04
167 ptydebug(int level, char *fmt, ...)
172 if (level <= pty_debug_level)
180 * This function creates and initializes a pts/ptc pair
182 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
183 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
185 * XXX: define and add mapping of upper minor bits to allow more
192 char *names = "pqrsPQRS";
195 /* For now we only map the lower 8 bits of the minor */
199 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
200 pt->devs = devs = make_dev(&pts_ops, n,
201 0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
202 pt->devc = devc = make_dev(&ptc_ops, n,
203 0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
205 devs->si_drv1 = devc->si_drv1 = pt;
206 devs->si_tty = devc->si_tty = &pt->pt_tty;
207 devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
208 devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
209 pt->pt_tty.t_dev = devs;
210 ttyregister(&pt->pt_tty);
215 ptyclone(struct dev_clone_args *ap)
221 * Limit the number of unix98 pty (slave) devices to 1000, as
222 * the utmp(5) format only allows for 8 bytes for the tty,
224 * If this limit is reached, we don't clone and return error
227 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 1000);
234 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
236 pt->devc = ap->a_dev = make_only_dev(&ptc98_ops, unit, ap->a_cred->cr_ruid,
237 0, 0600, "ptm/%d", unit);
238 pt->devs = make_dev(&pts98_ops, unit, ap->a_cred->cr_ruid, GID_TTY, 0620,
241 pt->devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
242 pt->devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
244 pt->devs->si_drv1 = pt->devc->si_drv1 = pt;
245 pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty;
246 pt->pt_tty.t_dev = pt->devs;
247 pt->pt_flags2 |= PF_UNIX98;
249 ttyregister(&pt->pt_tty);
257 ptsopen(struct dev_open_args *ap)
259 cdev_t dev = ap->a_head.a_dev;
262 struct pt_ioctl *pti;
270 if ((tp->t_state & TS_ISOPEN) == 0) {
271 ttychars(tp); /* Set up default chars */
272 tp->t_iflag = TTYDEF_IFLAG;
273 tp->t_oflag = TTYDEF_OFLAG;
274 tp->t_lflag = TTYDEF_LFLAG;
275 tp->t_cflag = TTYDEF_CFLAG;
276 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
277 } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
279 } else if (pti->pt_prison != ap->a_cred->cr_prison) {
282 if (tp->t_oproc) /* Ctrlr still around. */
283 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
284 while ((tp->t_state & TS_CARR_ON) == 0) {
285 if (ap->a_oflags & FNONBLOCK)
287 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
291 error = (*linesw[tp->t_line].l_open)(dev, tp);
293 ptcwakeup(tp, FREAD|FWRITE);
298 * On open of the slave, we set the corresponding flag in the common
301 ptydebug(1, "ptsopen=%s | unix98? %s\n", dev->si_name,
302 (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
304 if ((!error) && (pti->pt_flags2 & PF_UNIX98)) {
305 pti->pt_flags2 |= PF_SOPEN;
313 ptsclose(struct dev_close_args *ap)
315 cdev_t dev = ap->a_head.a_dev;
317 struct pt_ioctl *pti = dev->si_drv1;
321 err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
322 ptsstop(tp, FREAD|FWRITE);
328 * On close of the slave, we unset the corresponding flag, and if the master
329 * isn't open anymore, we destroy the slave and unset the unit.
331 ptydebug(1, "ptsclose=%s | unix98? %s\n", dev->si_name,
332 (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
334 if (pti->pt_flags2 & PF_UNIX98) {
335 pti->pt_flags2 &= ~PF_SOPEN;
336 KKASSERT((pti->pt_flags2 & PF_SOPEN) == 0);
337 ptydebug(1, "master open? %s\n",
338 (pti->pt_flags2 & PF_MOPEN)?"yes":"no");
340 if (!(pti->pt_flags2 & PF_SOPEN) && !(pti->pt_flags2 & PF_MOPEN)) {
341 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor);
351 ptsread(struct dev_read_args *ap)
353 cdev_t dev = ap->a_head.a_dev;
354 struct proc *p = curproc;
355 struct tty *tp = dev->si_tty;
356 struct pt_ioctl *pti = dev->si_drv1;
361 lp = curthread->td_lwp;
364 if (pti->pt_flags & PF_REMOTE) {
365 while (isbackground(p, tp)) {
366 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
367 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
368 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT)
370 pgsignal(p->p_pgrp, SIGTTIN, 1);
371 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
375 if (tp->t_canq.c_cc == 0) {
376 if (ap->a_ioflag & IO_NDELAY)
377 return (EWOULDBLOCK);
378 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
384 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
385 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
389 if (tp->t_canq.c_cc == 1)
390 clist_getc(&tp->t_canq);
395 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
396 ptcwakeup(tp, FWRITE);
401 * Write to pseudo-tty.
402 * Wakeups of controlling tty will happen
403 * indirectly, when tty driver calls ptsstart.
406 ptswrite(struct dev_write_args *ap)
408 cdev_t dev = ap->a_head.a_dev;
412 if (tp->t_oproc == 0)
414 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
418 * Start output on pseudo-tty.
419 * Wake up process selecting or sleeping for input from controlling tty.
422 ptsstart(struct tty *tp)
424 struct pt_ioctl *pti = tp->t_dev->si_drv1;
426 if (tp->t_state & TS_TTSTOP)
428 if (pti->pt_flags & PF_STOPPED) {
429 pti->pt_flags &= ~PF_STOPPED;
430 pti->pt_send = TIOCPKT_START;
432 ptcwakeup(tp, FREAD);
436 ptcwakeup(struct tty *tp, int flag)
439 wakeup(TSA_PTC_READ(tp));
440 KNOTE(&tp->t_rsel.si_note, 0);
443 wakeup(TSA_PTC_WRITE(tp));
444 KNOTE(&tp->t_wsel.si_note, 0);
449 ptcopen(struct dev_open_args *ap)
451 cdev_t dev = ap->a_head.a_dev;
453 struct pt_ioctl *pti;
460 if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison)
465 tp->t_oproc = ptsstart;
466 tp->t_stop = ptsstop;
467 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
468 tp->t_lflag &= ~EXTPROC;
469 pti->pt_prison = ap->a_cred->cr_prison;
474 pti->devs->si_uid = ap->a_cred->cr_uid;
475 pti->devs->si_gid = 0;
476 pti->devs->si_perms = 0600;
477 pti->devc->si_uid = ap->a_cred->cr_uid;
478 pti->devc->si_gid = 0;
479 pti->devc->si_perms = 0600;
484 * On open of the master, we set the corresponding flag in the common
487 ptydebug(1, "ptcopen=%s (master) | unix98? %s\n", dev->si_name,
488 (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
490 if (pti->pt_flags2 & PF_UNIX98) {
491 pti->pt_flags2 |= PF_MOPEN;
499 ptcclose(struct dev_close_args *ap)
501 cdev_t dev = ap->a_head.a_dev;
503 struct pt_ioctl *pti = dev->si_drv1;
506 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
511 * On close of the master, we unset the corresponding flag in the common
514 pti->pt_flags2 &= ~PF_MOPEN;
518 * XXX MDMBUF makes no sense for ptys but would inhibit the above
519 * l_modem(). CLOCAL makes sense but isn't supported. Special
520 * l_modem()s that ignore carrier drop make no sense for ptys but
521 * may be in use because other parts of the line discipline make
522 * sense for ptys. Recover by doing everything that a normal
523 * ttymodem() would have done except for sending a SIGHUP.
525 if (tp->t_state & TS_ISOPEN) {
526 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
527 tp->t_state |= TS_ZOMBIE;
528 ttyflush(tp, FREAD | FWRITE);
530 tp->t_oproc = 0; /* mark closed */
533 pti->pt_prison = NULL;
534 pti->devs->si_uid = 0;
535 pti->devs->si_gid = 0;
536 pti->devs->si_perms = 0666;
537 pti->devc->si_uid = 0;
538 pti->devc->si_gid = 0;
539 pti->devc->si_perms = 0666;
544 * On close of the master, we destroy the master and, if no slaves are open,
545 * we destroy the slave device and unset the unit.
547 ptydebug(1, "ptcclose=%s (master) | unix98? %s\n", dev->si_name,
548 (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
549 if (pti->pt_flags2 & PF_UNIX98) {
550 KKASSERT((pti->pt_flags2 & PF_MOPEN) == 0);
554 if (!(pti->pt_flags2 & PF_SOPEN)) {
555 ptydebug(1, "ptcclose: slaves are not open\n");
556 destroy_dev(pti->devs);
557 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor);
566 ptcread(struct dev_read_args *ap)
568 cdev_t dev = ap->a_head.a_dev;
569 struct tty *tp = dev->si_tty;
570 struct pt_ioctl *pti = dev->si_drv1;
575 * We want to block until the slave
576 * is open, and there's something to read;
577 * but if we lost the slave or we're NBIO,
578 * then return the appropriate error instead.
581 if (tp->t_state&TS_ISOPEN) {
582 if (pti->pt_flags&PF_PKT && pti->pt_send) {
583 error = ureadc((int)pti->pt_send, ap->a_uio);
586 if (pti->pt_send & TIOCPKT_IOCTL) {
587 cc = (int)szmin(ap->a_uio->uio_resid,
588 sizeof(tp->t_termios));
589 uiomove((caddr_t)&tp->t_termios, cc,
595 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
596 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
602 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
605 if ((tp->t_state & TS_CONNECTED) == 0)
606 return (0); /* EOF */
607 if (ap->a_ioflag & IO_NDELAY)
608 return (EWOULDBLOCK);
609 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
613 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
614 error = ureadc(0, ap->a_uio);
615 while (ap->a_uio->uio_resid > 0 && error == 0) {
616 cc = q_to_b(&tp->t_outq, buf,
617 (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
620 error = uiomove(buf, (size_t)cc, ap->a_uio);
627 ptsstop(struct tty *tp, int flush)
629 struct pt_ioctl *pti = tp->t_dev->si_drv1;
632 /* note: FLUSHREAD and FLUSHWRITE already ok */
634 flush = TIOCPKT_STOP;
635 pti->pt_flags |= PF_STOPPED;
637 pti->pt_flags &= ~PF_STOPPED;
638 pti->pt_send |= flush;
639 /* change of perspective */
649 * kqueue ops for pseudo-terminals.
651 static struct filterops ptcread_filtops =
652 { 1, NULL, filt_ptcrdetach, filt_ptcread };
653 static struct filterops ptcwrite_filtops =
654 { 1, NULL, filt_ptcwdetach, filt_ptcwrite };
657 ptckqfilter(struct dev_kqfilter_args *ap)
659 cdev_t dev = ap->a_head.a_dev;
660 struct knote *kn = ap->a_kn;
661 struct tty *tp = dev->si_tty;
665 switch (kn->kn_filter) {
667 klist = &tp->t_rsel.si_note;
668 kn->kn_fop = &ptcread_filtops;
671 klist = &tp->t_wsel.si_note;
672 kn->kn_fop = &ptcwrite_filtops;
675 ap->a_result = EOPNOTSUPP;
679 kn->kn_hook = (caddr_t)dev;
682 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
689 filt_ptcread (struct knote *kn, long hint)
691 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
692 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
694 if ((tp->t_state & TS_ISOPEN) &&
695 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
696 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
697 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
698 kn->kn_data = tp->t_outq.c_cc;
706 filt_ptcwrite (struct knote *kn, long hint)
708 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
709 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
711 if (tp->t_state & TS_ISOPEN &&
712 ((pti->pt_flags & PF_REMOTE) ?
713 (tp->t_canq.c_cc == 0) :
714 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
715 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) {
716 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc;
724 filt_ptcrdetach (struct knote *kn)
726 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
729 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
734 filt_ptcwdetach (struct knote *kn)
736 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
739 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
747 ptcwrite(struct dev_write_args *ap)
749 cdev_t dev = ap->a_head.a_dev;
750 struct tty *tp = dev->si_tty;
753 u_char locbuf[BUFSIZ];
755 struct pt_ioctl *pti = dev->si_drv1;
759 if ((tp->t_state&TS_ISOPEN) == 0)
761 if (pti->pt_flags & PF_REMOTE) {
764 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
765 tp->t_canq.c_cc < TTYHOG - 1) {
767 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
768 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
770 error = uiomove(cp, (size_t)cc, ap->a_uio);
773 /* check again for safety */
774 if ((tp->t_state & TS_ISOPEN) == 0) {
775 /* adjust as usual */
776 ap->a_uio->uio_resid += cc;
781 cc = b_to_q((char *)cp, cc, &tp->t_canq);
783 * XXX we don't guarantee that the canq size
784 * is >= TTYHOG, so the above b_to_q() may
785 * leave some bytes uncopied. However, space
786 * is guaranteed for the null terminator if
787 * we don't fail here since (TTYHOG - 1) is
788 * not a multiple of CBSIZE.
794 /* adjust for data copied in but not written */
795 ap->a_uio->uio_resid += cc;
796 clist_putc(0, &tp->t_canq);
798 wakeup(TSA_PTS_READ(tp));
801 while (ap->a_uio->uio_resid > 0 || cc > 0) {
803 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
805 error = uiomove(cp, (size_t)cc, ap->a_uio);
808 /* check again for safety */
809 if ((tp->t_state & TS_ISOPEN) == 0) {
810 /* adjust for data copied in but not written */
811 ap->a_uio->uio_resid += cc;
816 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
817 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
818 wakeup(TSA_HUP_OR_INPUT(tp));
821 (*linesw[tp->t_line].l_rint)(*cp++, tp);
830 * Come here to wait for slave to open, for space
831 * in outq, or space in rawq, or an empty canq.
833 if ((tp->t_state & TS_CONNECTED) == 0) {
834 /* adjust for data copied in but not written */
835 ap->a_uio->uio_resid += cc;
838 if (ap->a_ioflag & IO_NDELAY) {
839 /* adjust for data copied in but not written */
840 ap->a_uio->uio_resid += cc;
842 return (EWOULDBLOCK);
845 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
847 /* adjust for data copied in but not written */
848 ap->a_uio->uio_resid += cc;
856 ptyioctl(struct dev_ioctl_args *ap)
858 cdev_t dev = ap->a_head.a_dev;
859 struct tty *tp = dev->si_tty;
860 struct pt_ioctl *pti = dev->si_drv1;
861 u_char *cc = tp->t_cc;
864 if (dev_dflags(dev) & D_MASTER) {
869 * We avoid calling ttioctl on the controller since,
870 * in that case, tp must be the controlling terminal.
872 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
876 if (*(int *)ap->a_data) {
877 if (pti->pt_flags & PF_UCNTL)
879 pti->pt_flags |= PF_PKT;
881 pti->pt_flags &= ~PF_PKT;
885 if (*(int *)ap->a_data) {
886 if (pti->pt_flags & PF_PKT)
888 pti->pt_flags |= PF_UCNTL;
890 pti->pt_flags &= ~PF_UCNTL;
894 if (*(int *)ap->a_data)
895 pti->pt_flags |= PF_REMOTE;
897 pti->pt_flags &= ~PF_REMOTE;
898 ttyflush(tp, FREAD|FWRITE);
902 if ((pti->pt_flags2 & PF_UNIX98) && (pti->devc == dev))
909 * The rest of the ioctls shouldn't be called until
912 if ((tp->t_state & TS_ISOPEN) == 0)
925 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
926 * ttywflush(tp) will hang if there are characters in
929 ndflush(&tp->t_outq, tp->t_outq.c_cc);
933 if (*(unsigned int *)ap->a_data >= NSIG ||
934 *(unsigned int *)ap->a_data == 0)
936 if ((tp->t_lflag&NOFLSH) == 0)
937 ttyflush(tp, FREAD|FWRITE);
938 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
939 if ((*(unsigned int *)ap->a_data == SIGINFO) &&
940 ((tp->t_lflag&NOKERNINFO) == 0))
945 if (ap->a_cmd == TIOCEXT) {
947 * When the EXTPROC bit is being toggled, we need
948 * to send an TIOCPKT_IOCTL if the packet driver
951 if (*(int *)ap->a_data) {
952 if (pti->pt_flags & PF_PKT) {
953 pti->pt_send |= TIOCPKT_IOCTL;
954 ptcwakeup(tp, FREAD);
956 tp->t_lflag |= EXTPROC;
958 if ((tp->t_lflag & EXTPROC) &&
959 (pti->pt_flags & PF_PKT)) {
960 pti->pt_send |= TIOCPKT_IOCTL;
961 ptcwakeup(tp, FREAD);
963 tp->t_lflag &= ~EXTPROC;
967 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
968 ap->a_fflag, ap->a_cred);
969 if (error == ENOIOCTL)
970 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
971 if (error == ENOIOCTL) {
972 if (pti->pt_flags & PF_UCNTL &&
973 (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
974 if (ap->a_cmd & 0xff) {
975 pti->pt_ucntl = (u_char)ap->a_cmd;
976 ptcwakeup(tp, FREAD);
983 * If external processing and packet mode send ioctl packet.
985 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
994 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1001 pti->pt_send |= TIOCPKT_IOCTL;
1002 ptcwakeup(tp, FREAD);
1007 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
1008 && CCEQ(cc[VSTART], CTRL('q'));
1009 if (pti->pt_flags & PF_NOSTOP) {
1011 pti->pt_send &= ~TIOCPKT_NOSTOP;
1012 pti->pt_send |= TIOCPKT_DOSTOP;
1013 pti->pt_flags &= ~PF_NOSTOP;
1014 ptcwakeup(tp, FREAD);
1018 pti->pt_send &= ~TIOCPKT_DOSTOP;
1019 pti->pt_send |= TIOCPKT_NOSTOP;
1020 pti->pt_flags |= PF_NOSTOP;
1021 ptcwakeup(tp, FREAD);
1028 static void ptc_drvinit (void *unused);
1031 SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
1032 0, "Change pty debug level");
1036 ptc_drvinit(void *unused)
1043 * Create the clonable base device.
1045 make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone,
1046 0, 0, 0666, "ptmx");
1049 for (i = 0; i < 256; i++) {
1054 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)