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31 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
32 * $FreeBSD: src/sys/kern/tty_pty.c,v 1.74.2.4 2002/02/20 19:58:13 dillon Exp $
37 * Most functions here could use a separate lock to deal with concurrent
38 * access to the 'pt's.
40 * Right now the tty_token must be held for all this.
44 * Pseudo-teletype Driver
45 * (Actually two drivers, requiring two dev_ops structures)
48 #include <sys/param.h>
49 #include <sys/systm.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>
65 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
67 static void ptsstart (struct tty *tp);
68 static void ptsstop (struct tty *tp, int rw);
69 static void ptsunhold (struct tty *tp);
70 static void ptcwakeup (struct tty *tp, int flag);
71 static void ptyinit (int n);
72 static int filt_ptcread (struct knote *kn, long hint);
73 static void filt_ptcrdetach (struct knote *kn);
74 static int filt_ptcwrite (struct knote *kn, long hint);
75 static void filt_ptcwdetach (struct knote *kn);
77 static d_open_t ptsopen;
78 static d_close_t ptsclose;
79 static d_read_t ptsread;
80 static d_write_t ptswrite;
81 static d_ioctl_t ptyioctl;
82 static d_open_t ptcopen;
83 static d_close_t ptcclose;
84 static d_read_t ptcread;
85 static d_write_t ptcwrite;
86 static d_kqfilter_t ptckqfilter;
88 DEVFS_DEFINE_CLONE_BITMAP(pty);
90 static d_clone_t ptyclone;
92 static int pty_debug_level = 0;
94 static struct dev_ops pts98_ops = {
95 { "pts98", 0, D_TTY | D_MPSAFE },
101 .d_kqfilter = ttykqfilter,
102 .d_revoke = ttyrevoke
105 static struct dev_ops ptc98_ops = {
106 { "ptc98", 0, D_TTY | D_MASTER | D_MPSAFE },
112 .d_kqfilter = ptckqfilter,
113 .d_revoke = ttyrevoke
116 static struct dev_ops pts_ops = {
117 { "pts", 0, D_TTY | D_MPSAFE },
123 .d_kqfilter = ttykqfilter,
124 .d_revoke = ttyrevoke
127 #define CDEV_MAJOR_C 6
128 static struct dev_ops ptc_ops = {
129 { "ptc", 0, D_TTY | D_MASTER | D_MPSAFE },
135 .d_kqfilter = ptckqfilter,
136 .d_revoke = ttyrevoke
139 #define BUFSIZ 100 /* Chunk size iomoved to/from user */
143 int pt_refs; /* Structural references interlock S/MOPEN */
145 struct kqinfo pt_kqr, pt_kqw;
150 struct prison *pt_prison;
156 #define PF_PKT 0x0008 /* packet mode */
157 #define PF_STOPPED 0x0010 /* user told stopped */
158 #define PF_REMOTE 0x0020 /* remote and flow controlled input */
159 #define PF_NOSTOP 0x0040
160 #define PF_UCNTL 0x0080 /* user control mode */
162 #define PF_PTCSTATEMASK 0x00FF
165 * pt_flags open state. Note that PF_SCLOSED is used to activate
166 * read EOF on the ptc so it is only set after the slave has been
167 * opened and then closed, and cleared again if the slave is opened
170 #define PF_UNIX98 0x0100
171 #define PF_SOPEN 0x0200
172 #define PF_MOPEN 0x0400
173 #define PF_SCLOSED 0x0800
174 #define PF_TERMINATED 0x8000
177 * This function creates and initializes a pts/ptc pair
179 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
180 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
182 * XXX: define and add mapping of upper minor bits to allow more
189 char *names = "pqrsPQRS";
192 /* For now we only map the lower 8 bits of the minor */
196 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
197 pt->devs = devs = make_dev(&pts_ops, n,
198 0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
199 pt->devc = devc = make_dev(&ptc_ops, n,
200 0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
202 pt->pt_tty.t_dev = devs;
204 devs->si_drv1 = devc->si_drv1 = pt;
205 devs->si_tty = devc->si_tty = &pt->pt_tty;
206 devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
207 devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
208 ttyregister(&pt->pt_tty);
212 ptyclone(struct dev_clone_args *ap)
218 * Limit the number of unix98 pty (slave) devices to 1000, as
219 * the utmp(5) format only allows for 8 bytes for the tty,
221 * If this limit is reached, we don't clone and return error
224 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 1000);
231 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
233 pt->devc = make_only_dev(&ptc98_ops, unit,
235 0, 0600, "ptm/%d", unit);
236 pt->devs = make_dev(&pts98_ops, unit,
238 GID_TTY, 0620, "pts/%d", unit);
239 ap->a_dev = pt->devc;
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->pt_tty.t_dev = pt->devs;
245 pt->pt_flags |= PF_UNIX98;
246 pt->pt_uminor = unit;
247 pt->devs->si_drv1 = pt->devc->si_drv1 = pt;
248 pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty;
250 ttyregister(&pt->pt_tty);
256 * pti_hold() prevents the pti from being destroyed due to a termination
257 * while a pt*open() is blocked.
259 * This function returns non-zero if we cannot hold due to a termination
262 * NOTE: Must be called with tty_token held
265 pti_hold(struct pt_ioctl *pti)
267 if (pti->pt_flags & PF_TERMINATED)
274 * pti_done() releases the reference and checks to see if both sides have
275 * been closed on a unix98 pty, allowing us to destroy the device and
278 * We do not release resources on non-unix98 ptys. Those are left
279 * statically allocated.
282 pti_done(struct pt_ioctl *pti)
284 lwkt_gettoken(&tty_token);
285 if (--pti->pt_refs == 0) {
290 * Only unix09 ptys are freed up
292 if ((pti->pt_flags & PF_UNIX98) == 0) {
293 lwkt_reltoken(&tty_token);
298 * Interlock open attempts against termination by setting
299 * PF_TERMINATED. This allows us to block while cleaning
300 * out the device infrastructure.
302 * Do not terminate the tty if it still has a session
303 * association (t_refs).
305 if ((pti->pt_flags & (PF_SOPEN|PF_MOPEN)) == 0 &&
306 pti->pt_tty.t_refs == 0) {
307 pti->pt_flags |= PF_TERMINATED;
308 uminor_no = pti->pt_uminor;
310 if ((dev = pti->devs) != NULL) {
315 if ((dev = pti->devc) != NULL) {
320 ttyunregister(&pti->pt_tty);
321 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty),
326 lwkt_reltoken(&tty_token);
331 ptsopen(struct dev_open_args *ap)
333 cdev_t dev = ap->a_head.a_dev;
336 struct pt_ioctl *pti;
339 * The pti will already be assigned by the clone code or
340 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
341 * we are somehow racing a unix98 termination.
343 if (dev->si_drv1 == NULL)
347 lwkt_gettoken(&tty_token);
349 lwkt_reltoken(&tty_token);
356 * Reinit most of the tty state if it isn't open. Handle
359 if ((tp->t_state & TS_ISOPEN) == 0) {
360 ttychars(tp); /* Set up default chars */
361 tp->t_iflag = TTYDEF_IFLAG;
362 tp->t_oflag = TTYDEF_OFLAG;
363 tp->t_lflag = TTYDEF_LFLAG;
364 tp->t_cflag = TTYDEF_CFLAG;
365 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
366 } else if ((tp->t_state & TS_XCLUDE) &&
367 priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
369 lwkt_reltoken(&tty_token);
371 } else if (pti->pt_prison != ap->a_cred->cr_prison) {
373 lwkt_reltoken(&tty_token);
378 * If the ptc is already present this will connect us up. It
379 * is unclear if this is actually needed.
381 * If neither side is open be sure to clear any left over
382 * ZOMBIE state before continuing.
385 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
386 else if ((pti->pt_flags & PF_SOPEN) == 0)
387 tp->t_state &= ~TS_ZOMBIE;
390 * Wait for the carrier (ptc side)
392 while ((tp->t_state & TS_CARR_ON) == 0) {
393 if (ap->a_oflags & FNONBLOCK)
395 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
398 lwkt_reltoken(&tty_token);
404 * Mark the tty open and mark the slave side as being open.
406 error = (*linesw[tp->t_line].l_open)(dev, tp);
409 pti->pt_flags |= PF_SOPEN;
410 pti->pt_flags &= ~PF_SCLOSED;
411 ptcwakeup(tp, FREAD|FWRITE);
415 lwkt_reltoken(&tty_token);
420 ptsclose(struct dev_close_args *ap)
422 cdev_t dev = ap->a_head.a_dev;
424 struct pt_ioctl *pti = dev->si_drv1;
427 lwkt_gettoken(&tty_token);
429 panic("ptsclose on terminated pti");
432 * Disconnect the slave side
435 err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
436 ptsstop(tp, FREAD|FWRITE);
437 ttyclose(tp); /* clears t_state */
440 * Mark the pts side closed and signal the ptc. Do not mark the
441 * tty a zombie... that is, allow the tty to be re-opened as long
442 * as the ptc is still open. The ptc will read() EOFs until the
443 * pts side is reopened or the ptc is closed.
445 * xterm() depends on this behavior as it will revoke() the pts
446 * and then reopen it after the (unnecessary old code) chmod.
448 pti->pt_flags &= ~PF_SOPEN;
449 pti->pt_flags |= PF_SCLOSED;
451 ptcwakeup(tp, FREAD);
453 lwkt_reltoken(&tty_token);
458 ptsread(struct dev_read_args *ap)
460 cdev_t dev = ap->a_head.a_dev;
461 struct proc *p = curproc;
462 struct tty *tp = dev->si_tty;
463 struct pt_ioctl *pti = dev->si_drv1;
468 lp = curthread->td_lwp;
470 lwkt_gettoken(&tty_token);
472 if (pti->pt_flags & PF_REMOTE) {
473 while (isbackground(p, tp)) {
474 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
475 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
476 p->p_pgrp->pg_jobc == 0 ||
477 (p->p_flags & P_PPWAIT)) {
478 lwkt_reltoken(&tty_token);
481 pgsignal(p->p_pgrp, SIGTTIN, 1);
482 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
484 lwkt_reltoken(&tty_token);
488 if (tp->t_canq.c_cc == 0) {
489 if (ap->a_ioflag & IO_NDELAY) {
490 lwkt_reltoken(&tty_token);
491 return (EWOULDBLOCK);
493 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
496 lwkt_reltoken(&tty_token);
501 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
502 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
506 if (tp->t_canq.c_cc == 1)
507 clist_getc(&tp->t_canq);
508 if (tp->t_canq.c_cc) {
509 lwkt_reltoken(&tty_token);
514 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
515 ptcwakeup(tp, FWRITE);
516 lwkt_reltoken(&tty_token);
521 * Write to pseudo-tty.
522 * Wakeups of controlling tty will happen
523 * indirectly, when tty driver calls ptsstart.
526 ptswrite(struct dev_write_args *ap)
528 cdev_t dev = ap->a_head.a_dev;
532 lwkt_gettoken(&tty_token);
534 if (tp->t_oproc == NULL) {
535 lwkt_reltoken(&tty_token);
538 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
539 lwkt_reltoken(&tty_token);
544 * Start output on pseudo-tty.
545 * Wake up process selecting or sleeping for input from controlling tty.
548 ptsstart(struct tty *tp)
550 lwkt_gettoken(&tty_token);
551 struct pt_ioctl *pti = tp->t_dev->si_drv1;
553 if (tp->t_state & TS_TTSTOP) {
554 lwkt_reltoken(&tty_token);
558 if (pti->pt_flags & PF_STOPPED) {
559 pti->pt_flags &= ~PF_STOPPED;
560 pti->pt_send = TIOCPKT_START;
563 ptcwakeup(tp, FREAD);
564 lwkt_reltoken(&tty_token);
568 * NOTE: Must be called with tty_token held
571 ptcwakeup(struct tty *tp, int flag)
573 ASSERT_LWKT_TOKEN_HELD(&tty_token);
576 wakeup(TSA_PTC_READ(tp));
577 KNOTE(&tp->t_rkq.ki_note, 0);
580 wakeup(TSA_PTC_WRITE(tp));
581 KNOTE(&tp->t_wkq.ki_note, 0);
586 ptcopen(struct dev_open_args *ap)
588 cdev_t dev = ap->a_head.a_dev;
590 struct pt_ioctl *pti;
593 * The pti will already be assigned by the clone code or
594 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
595 * we are somehow racing a unix98 termination.
597 if (dev->si_drv1 == NULL)
600 lwkt_gettoken(&tty_token);
603 lwkt_reltoken(&tty_token);
606 if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison) {
608 lwkt_reltoken(&tty_token);
614 lwkt_reltoken(&tty_token);
619 * If the slave side is not yet open clear any left over zombie
620 * state before doing our modem control.
622 if ((pti->pt_flags & PF_SOPEN) == 0)
623 tp->t_state &= ~TS_ZOMBIE;
625 tp->t_oproc = ptsstart;
626 tp->t_stop = ptsstop;
627 tp->t_unhold = ptsunhold;
632 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
634 tp->t_lflag &= ~EXTPROC;
635 pti->pt_prison = ap->a_cred->cr_prison;
636 pti->pt_flags &= ~PF_PTCSTATEMASK;
640 pti->devs->si_uid = ap->a_cred->cr_uid;
641 pti->devs->si_gid = 0;
642 pti->devs->si_perms = 0600;
643 pti->devc->si_uid = ap->a_cred->cr_uid;
644 pti->devc->si_gid = 0;
645 pti->devc->si_perms = 0600;
648 * Mark master side open. This does not cause any events
651 pti->pt_flags |= PF_MOPEN;
654 lwkt_reltoken(&tty_token);
659 ptcclose(struct dev_close_args *ap)
661 cdev_t dev = ap->a_head.a_dev;
663 struct pt_ioctl *pti = dev->si_drv1;
665 lwkt_gettoken(&tty_token);
667 panic("ptcclose on terminated pti");
670 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
673 * Mark the master side closed. If the slave is still open
674 * mark the tty ZOMBIE, preventing any new action until both
677 * NOTE: The ttyflush() will wake up the slave once we've
678 * set appropriate flags. The ZOMBIE flag will be
679 * cleared when the slave side is closed.
681 pti->pt_flags &= ~PF_MOPEN;
682 if (pti->pt_flags & PF_SOPEN)
683 tp->t_state |= TS_ZOMBIE;
686 * Turn off the carrier and disconnect. This will notify the slave
689 if (tp->t_state & TS_ISOPEN) {
690 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
691 ttyflush(tp, FREAD | FWRITE);
693 tp->t_oproc = NULL; /* mark closed */
695 pti->pt_prison = NULL;
696 pti->devs->si_uid = 0;
697 pti->devs->si_gid = 0;
698 pti->devs->si_perms = 0666;
699 pti->devc->si_uid = 0;
700 pti->devc->si_gid = 0;
701 pti->devc->si_perms = 0666;
705 lwkt_reltoken(&tty_token);
710 ptcread(struct dev_read_args *ap)
712 cdev_t dev = ap->a_head.a_dev;
713 struct tty *tp = dev->si_tty;
714 struct pt_ioctl *pti = dev->si_drv1;
718 lwkt_gettoken(&tty_token);
720 * We want to block until the slave
721 * is open, and there's something to read;
722 * but if we lost the slave or we're NBIO,
723 * then return the appropriate error instead.
726 if (tp->t_state&TS_ISOPEN) {
727 if ((pti->pt_flags & PF_PKT) && pti->pt_send) {
728 error = ureadc((int)pti->pt_send, ap->a_uio);
730 lwkt_reltoken(&tty_token);
733 if (pti->pt_send & TIOCPKT_IOCTL) {
734 cc = (int)szmin(ap->a_uio->uio_resid,
735 sizeof(tp->t_termios));
736 uiomove((caddr_t)&tp->t_termios, cc,
740 lwkt_reltoken(&tty_token);
743 if ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl) {
744 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
746 lwkt_reltoken(&tty_token);
750 lwkt_reltoken(&tty_token);
753 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
756 if ((tp->t_state & TS_CONNECTED) == 0) {
757 lwkt_reltoken(&tty_token);
758 return (0); /* EOF */
760 if (ap->a_ioflag & IO_NDELAY) {
761 lwkt_reltoken(&tty_token);
762 return (EWOULDBLOCK);
764 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
766 lwkt_reltoken(&tty_token);
770 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
771 error = ureadc(0, ap->a_uio);
772 while (ap->a_uio->uio_resid > 0 && error == 0) {
773 cc = q_to_b(&tp->t_outq, buf,
774 (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
777 error = uiomove(buf, (size_t)cc, ap->a_uio);
780 lwkt_reltoken(&tty_token);
785 ptsstop(struct tty *tp, int flush)
787 struct pt_ioctl *pti = tp->t_dev->si_drv1;
790 lwkt_gettoken(&tty_token);
791 /* note: FLUSHREAD and FLUSHWRITE already ok */
794 flush = TIOCPKT_STOP;
795 pti->pt_flags |= PF_STOPPED;
797 pti->pt_flags &= ~PF_STOPPED;
799 pti->pt_send |= flush;
800 /* change of perspective */
809 lwkt_reltoken(&tty_token);
813 * ttyunhold() calls us instead of just decrementing tp->t_refs. This
814 * is needed because a session can hold onto a pts (half closed state)
815 * even if there are no live file descriptors. Without the callback
819 ptsunhold(struct tty *tp)
821 struct pt_ioctl *pti = tp->t_dev->si_drv1;
823 lwkt_gettoken(&tty_token);
827 lwkt_reltoken(&tty_token);
831 * kqueue ops for pseudo-terminals.
833 static struct filterops ptcread_filtops =
834 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcrdetach, filt_ptcread };
835 static struct filterops ptcwrite_filtops =
836 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcwdetach, filt_ptcwrite };
839 ptckqfilter(struct dev_kqfilter_args *ap)
841 cdev_t dev = ap->a_head.a_dev;
842 struct knote *kn = ap->a_kn;
843 struct tty *tp = dev->si_tty;
847 switch (kn->kn_filter) {
849 klist = &tp->t_rkq.ki_note;
850 kn->kn_fop = &ptcread_filtops;
853 klist = &tp->t_wkq.ki_note;
854 kn->kn_fop = &ptcwrite_filtops;
857 ap->a_result = EOPNOTSUPP;
861 kn->kn_hook = (caddr_t)dev;
862 knote_insert(klist, kn);
867 filt_ptcread (struct knote *kn, long hint)
869 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
870 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
872 lwkt_gettoken(&tty_token);
873 if ((tp->t_state & TS_ZOMBIE) || (pti->pt_flags & PF_SCLOSED)) {
874 lwkt_reltoken(&tty_token);
875 kn->kn_flags |= (EV_EOF | EV_NODATA);
879 if ((tp->t_state & TS_ISOPEN) &&
880 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
881 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
882 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
883 kn->kn_data = tp->t_outq.c_cc;
884 lwkt_reltoken(&tty_token);
887 lwkt_reltoken(&tty_token);
893 filt_ptcwrite (struct knote *kn, long hint)
895 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
896 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
898 lwkt_gettoken(&tty_token);
899 if (tp->t_state & TS_ZOMBIE) {
900 lwkt_reltoken(&tty_token);
901 kn->kn_flags |= (EV_EOF | EV_NODATA);
905 if (tp->t_state & TS_ISOPEN &&
906 ((pti->pt_flags & PF_REMOTE) ?
907 (tp->t_canq.c_cc == 0) :
908 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
909 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) {
910 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc;
911 lwkt_reltoken(&tty_token);
914 lwkt_reltoken(&tty_token);
921 filt_ptcrdetach (struct knote *kn)
923 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
925 knote_remove(&tp->t_rkq.ki_note, kn);
929 filt_ptcwdetach (struct knote *kn)
931 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
933 knote_remove(&tp->t_wkq.ki_note, kn);
940 ptcwrite(struct dev_write_args *ap)
942 cdev_t dev = ap->a_head.a_dev;
943 struct tty *tp = dev->si_tty;
946 u_char locbuf[BUFSIZ];
948 struct pt_ioctl *pti = dev->si_drv1;
951 lwkt_gettoken(&tty_token);
953 if ((tp->t_state&TS_ISOPEN) == 0)
955 if (pti->pt_flags & PF_REMOTE) {
958 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
959 tp->t_canq.c_cc < TTYHOG - 1) {
961 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
962 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
964 error = uiomove(cp, (size_t)cc, ap->a_uio);
966 lwkt_reltoken(&tty_token);
969 /* check again for safety */
970 if ((tp->t_state & TS_ISOPEN) == 0) {
971 /* adjust as usual */
972 ap->a_uio->uio_resid += cc;
973 lwkt_reltoken(&tty_token);
978 cc = b_to_q((char *)cp, cc, &tp->t_canq);
980 * XXX we don't guarantee that the canq size
981 * is >= TTYHOG, so the above b_to_q() may
982 * leave some bytes uncopied. However, space
983 * is guaranteed for the null terminator if
984 * we don't fail here since (TTYHOG - 1) is
985 * not a multiple of CBSIZE.
991 /* adjust for data copied in but not written */
992 ap->a_uio->uio_resid += cc;
993 clist_putc(0, &tp->t_canq);
995 wakeup(TSA_PTS_READ(tp));
996 lwkt_reltoken(&tty_token);
999 while (ap->a_uio->uio_resid > 0 || cc > 0) {
1001 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
1003 error = uiomove(cp, (size_t)cc, ap->a_uio);
1005 lwkt_reltoken(&tty_token);
1008 /* check again for safety */
1009 if ((tp->t_state & TS_ISOPEN) == 0) {
1010 /* adjust for data copied in but not written */
1011 ap->a_uio->uio_resid += cc;
1012 lwkt_reltoken(&tty_token);
1017 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
1018 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
1019 wakeup(TSA_HUP_OR_INPUT(tp));
1022 (*linesw[tp->t_line].l_rint)(*cp++, tp);
1028 lwkt_reltoken(&tty_token);
1032 * Come here to wait for slave to open, for space
1033 * in outq, or space in rawq, or an empty canq.
1035 if ((tp->t_state & TS_CONNECTED) == 0) {
1036 /* adjust for data copied in but not written */
1037 ap->a_uio->uio_resid += cc;
1038 lwkt_reltoken(&tty_token);
1041 if (ap->a_ioflag & IO_NDELAY) {
1042 /* adjust for data copied in but not written */
1043 ap->a_uio->uio_resid += cc;
1045 lwkt_reltoken(&tty_token);
1046 return (EWOULDBLOCK);
1048 lwkt_reltoken(&tty_token);
1051 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
1053 /* adjust for data copied in but not written */
1054 ap->a_uio->uio_resid += cc;
1055 lwkt_reltoken(&tty_token);
1063 ptyioctl(struct dev_ioctl_args *ap)
1065 cdev_t dev = ap->a_head.a_dev;
1066 struct tty *tp = dev->si_tty;
1067 struct pt_ioctl *pti = dev->si_drv1;
1068 u_char *cc = tp->t_cc;
1071 lwkt_gettoken(&tty_token);
1072 if (dev_dflags(dev) & D_MASTER) {
1073 switch (ap->a_cmd) {
1077 * We avoid calling ttioctl on the controller since,
1078 * in that case, tp must be the controlling terminal.
1080 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1081 lwkt_reltoken(&tty_token);
1085 if (*(int *)ap->a_data) {
1086 if (pti->pt_flags & PF_UCNTL) {
1087 lwkt_reltoken(&tty_token);
1090 pti->pt_flags |= PF_PKT;
1092 pti->pt_flags &= ~PF_PKT;
1094 lwkt_reltoken(&tty_token);
1098 if (*(int *)ap->a_data) {
1099 if (pti->pt_flags & PF_PKT) {
1100 lwkt_reltoken(&tty_token);
1103 pti->pt_flags |= PF_UCNTL;
1105 pti->pt_flags &= ~PF_UCNTL;
1107 lwkt_reltoken(&tty_token);
1111 if (*(int *)ap->a_data)
1112 pti->pt_flags |= PF_REMOTE;
1114 pti->pt_flags &= ~PF_REMOTE;
1115 ttyflush(tp, FREAD|FWRITE);
1116 lwkt_reltoken(&tty_token);
1119 case TIOCISPTMASTER:
1120 if ((pti->pt_flags & PF_UNIX98) &&
1121 (pti->devc == dev)) {
1122 lwkt_reltoken(&tty_token);
1125 lwkt_reltoken(&tty_token);
1131 * The rest of the ioctls shouldn't be called until
1132 * the slave is open.
1134 if ((tp->t_state & TS_ISOPEN) == 0) {
1135 lwkt_reltoken(&tty_token);
1139 switch (ap->a_cmd) {
1145 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
1146 * ttywflush(tp) will hang if there are characters in
1149 ndflush(&tp->t_outq, tp->t_outq.c_cc);
1153 if (*(unsigned int *)ap->a_data >= NSIG ||
1154 *(unsigned int *)ap->a_data == 0) {
1155 lwkt_reltoken(&tty_token);
1158 if ((tp->t_lflag&NOFLSH) == 0)
1159 ttyflush(tp, FREAD|FWRITE);
1160 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
1161 if ((*(unsigned int *)ap->a_data == SIGINFO) &&
1162 ((tp->t_lflag&NOKERNINFO) == 0))
1164 lwkt_reltoken(&tty_token);
1168 if (ap->a_cmd == TIOCEXT) {
1170 * When the EXTPROC bit is being toggled, we need
1171 * to send an TIOCPKT_IOCTL if the packet driver
1174 if (*(int *)ap->a_data) {
1175 if (pti->pt_flags & PF_PKT) {
1176 pti->pt_send |= TIOCPKT_IOCTL;
1177 ptcwakeup(tp, FREAD);
1179 tp->t_lflag |= EXTPROC;
1181 if ((tp->t_lflag & EXTPROC) &&
1182 (pti->pt_flags & PF_PKT)) {
1183 pti->pt_send |= TIOCPKT_IOCTL;
1184 ptcwakeup(tp, FREAD);
1186 tp->t_lflag &= ~EXTPROC;
1188 lwkt_reltoken(&tty_token);
1191 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
1192 ap->a_fflag, ap->a_cred);
1193 if (error == ENOIOCTL)
1194 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
1195 if (error == ENOIOCTL) {
1196 if (pti->pt_flags & PF_UCNTL &&
1197 (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
1198 if (ap->a_cmd & 0xff) {
1199 pti->pt_ucntl = (u_char)ap->a_cmd;
1200 ptcwakeup(tp, FREAD);
1202 lwkt_reltoken(&tty_token);
1208 * If external processing and packet mode send ioctl packet.
1210 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
1215 pti->pt_send |= TIOCPKT_IOCTL;
1216 ptcwakeup(tp, FREAD);
1221 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
1222 && CCEQ(cc[VSTART], CTRL('q'));
1223 if (pti->pt_flags & PF_NOSTOP) {
1225 pti->pt_send &= ~TIOCPKT_NOSTOP;
1226 pti->pt_send |= TIOCPKT_DOSTOP;
1227 pti->pt_flags &= ~PF_NOSTOP;
1228 ptcwakeup(tp, FREAD);
1232 pti->pt_send &= ~TIOCPKT_DOSTOP;
1233 pti->pt_send |= TIOCPKT_NOSTOP;
1234 pti->pt_flags |= PF_NOSTOP;
1235 ptcwakeup(tp, FREAD);
1238 lwkt_reltoken(&tty_token);
1243 static void ptc_drvinit (void *unused);
1245 SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
1246 0, "Change pty debug level");
1249 ptc_drvinit(void *unused)
1255 * Create the clonable base device.
1257 make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone,
1258 0, 0, 0666, "ptmx");
1260 for (i = 0; i < 256; i++) {
1265 SYSINIT(ptcdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE + CDEV_MAJOR_C, ptc_drvinit,