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35 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
36 * $FreeBSD: src/sys/kern/tty_pty.c,v 1.74.2.4 2002/02/20 19:58:13 dillon Exp $
41 * Most functions here could use a separate lock to deal with concurrent
42 * access to the 'pt's.
44 * Right now the tty_token must be held for all this.
48 * Pseudo-teletype Driver
49 * (Actually two drivers, requiring two dev_ops structures)
52 #include "opt_compat.h"
54 #include <sys/param.h>
55 #include <sys/systm.h>
56 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
57 #include <sys/ioctl_compat.h>
63 #include <sys/fcntl.h>
64 #include <sys/kernel.h>
65 #include <sys/vnode.h>
66 #include <sys/signalvar.h>
67 #include <sys/malloc.h>
68 #include <sys/device.h>
69 #include <sys/thread2.h>
70 #include <sys/devfs.h>
72 #include <sys/sysctl.h>
76 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
78 static void ptsstart (struct tty *tp);
79 static void ptsstop (struct tty *tp, int rw);
80 static void ptsunhold (struct tty *tp);
81 static void ptcwakeup (struct tty *tp, int flag);
82 static void ptyinit (int n);
83 static int filt_ptcread (struct knote *kn, long hint);
84 static void filt_ptcrdetach (struct knote *kn);
85 static int filt_ptcwrite (struct knote *kn, long hint);
86 static void filt_ptcwdetach (struct knote *kn);
88 static d_open_t ptsopen;
89 static d_close_t ptsclose;
90 static d_read_t ptsread;
91 static d_write_t ptswrite;
92 static d_ioctl_t ptyioctl;
93 static d_open_t ptcopen;
94 static d_close_t ptcclose;
95 static d_read_t ptcread;
96 static d_write_t ptcwrite;
97 static d_kqfilter_t ptckqfilter;
100 DEVFS_DECLARE_CLONE_BITMAP(pty);
102 static d_clone_t ptyclone;
104 static int pty_debug_level = 0;
106 static struct dev_ops pts98_ops = {
107 { "pts98", 0, D_TTY | D_MPSAFE },
113 .d_kqfilter = ttykqfilter,
114 .d_revoke = ttyrevoke
117 static struct dev_ops ptc98_ops = {
118 { "ptc98", 0, D_TTY | D_MASTER | D_MPSAFE },
124 .d_kqfilter = ptckqfilter,
125 .d_revoke = ttyrevoke
129 static struct dev_ops pts_ops = {
130 { "pts", 0, D_TTY | D_MPSAFE },
136 .d_kqfilter = ttykqfilter,
137 .d_revoke = ttyrevoke
140 #define CDEV_MAJOR_C 6
141 static struct dev_ops ptc_ops = {
142 { "ptc", 0, D_TTY | D_MASTER | D_MPSAFE },
148 .d_kqfilter = ptckqfilter,
149 .d_revoke = ttyrevoke
152 #define BUFSIZ 100 /* Chunk size iomoved to/from user */
156 int pt_refs; /* Structural references interlock S/MOPEN */
158 struct kqinfo pt_kqr, pt_kqw;
163 struct prison *pt_prison;
169 #define PF_PKT 0x0008 /* packet mode */
170 #define PF_STOPPED 0x0010 /* user told stopped */
171 #define PF_REMOTE 0x0020 /* remote and flow controlled input */
172 #define PF_NOSTOP 0x0040
173 #define PF_UCNTL 0x0080 /* user control mode */
175 #define PF_PTCSTATEMASK 0x00FF
178 * pt_flags open state. Note that PF_SCLOSED is used to activate
179 * read EOF on the ptc so it is only set after the slave has been
180 * opened and then closed, and cleared again if the slave is opened
183 #define PF_UNIX98 0x0100
184 #define PF_SOPEN 0x0200
185 #define PF_MOPEN 0x0400
186 #define PF_SCLOSED 0x0800
187 #define PF_TERMINATED 0x8000
190 * This function creates and initializes a pts/ptc pair
192 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
193 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
195 * XXX: define and add mapping of upper minor bits to allow more
202 char *names = "pqrsPQRS";
205 /* For now we only map the lower 8 bits of the minor */
209 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
210 pt->devs = devs = make_dev(&pts_ops, n,
211 0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
212 pt->devc = devc = make_dev(&ptc_ops, n,
213 0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
215 pt->pt_tty.t_dev = devs;
217 devs->si_drv1 = devc->si_drv1 = pt;
218 devs->si_tty = devc->si_tty = &pt->pt_tty;
219 devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
220 devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
221 ttyregister(&pt->pt_tty);
226 ptyclone(struct dev_clone_args *ap)
232 * Limit the number of unix98 pty (slave) devices to 1000, as
233 * the utmp(5) format only allows for 8 bytes for the tty,
235 * If this limit is reached, we don't clone and return error
238 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 1000);
245 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
247 pt->devc = make_only_dev(&ptc98_ops, unit,
249 0, 0600, "ptm/%d", unit);
250 pt->devs = make_dev(&pts98_ops, unit,
252 GID_TTY, 0620, "pts/%d", unit);
253 ap->a_dev = pt->devc;
255 pt->devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
256 pt->devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
258 pt->pt_tty.t_dev = pt->devs;
259 pt->pt_flags |= PF_UNIX98;
260 pt->pt_uminor = unit;
261 pt->devs->si_drv1 = pt->devc->si_drv1 = pt;
262 pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty;
264 ttyregister(&pt->pt_tty);
271 * pti_hold() prevents the pti from being destroyed due to a termination
272 * while a pt*open() is blocked.
274 * This function returns non-zero if we cannot hold due to a termination
277 * NOTE: Must be called with tty_token held
280 pti_hold(struct pt_ioctl *pti)
282 if (pti->pt_flags & PF_TERMINATED)
289 * pti_done() releases the reference and checks to see if both sides have
290 * been closed on a unix98 pty, allowing us to destroy the device and
293 * We do not release resources on non-unix98 ptys. Those are left
294 * statically allocated.
297 pti_done(struct pt_ioctl *pti)
299 lwkt_gettoken(&tty_token);
300 if (--pti->pt_refs == 0) {
306 * Only unix09 ptys are freed up
308 if ((pti->pt_flags & PF_UNIX98) == 0) {
309 lwkt_reltoken(&tty_token);
314 * Interlock open attempts against termination by setting
315 * PF_TERMINATED. This allows us to block while cleaning
316 * out the device infrastructure.
318 * Do not terminate the tty if it still has a session
319 * association (t_refs).
321 if ((pti->pt_flags & (PF_SOPEN|PF_MOPEN)) == 0 &&
322 pti->pt_tty.t_refs == 0) {
323 pti->pt_flags |= PF_TERMINATED;
324 uminor_no = pti->pt_uminor;
326 if ((dev = pti->devs) != NULL) {
331 if ((dev = pti->devc) != NULL) {
336 ttyunregister(&pti->pt_tty);
337 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty),
343 lwkt_reltoken(&tty_token);
348 ptsopen(struct dev_open_args *ap)
350 cdev_t dev = ap->a_head.a_dev;
353 struct pt_ioctl *pti;
356 * The pti will already be assigned by the clone code or
357 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
358 * we are somehow racing a unix98 termination.
360 if (dev->si_drv1 == NULL)
364 lwkt_gettoken(&tty_token);
366 lwkt_reltoken(&tty_token);
373 * Reinit most of the tty state if it isn't open. Handle
376 if ((tp->t_state & TS_ISOPEN) == 0) {
377 ttychars(tp); /* Set up default chars */
378 tp->t_iflag = TTYDEF_IFLAG;
379 tp->t_oflag = TTYDEF_OFLAG;
380 tp->t_lflag = TTYDEF_LFLAG;
381 tp->t_cflag = TTYDEF_CFLAG;
382 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
383 } else if ((tp->t_state & TS_XCLUDE) &&
384 priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
386 lwkt_reltoken(&tty_token);
388 } else if (pti->pt_prison != ap->a_cred->cr_prison) {
390 lwkt_reltoken(&tty_token);
395 * If the ptc is already present this will connect us up. It
396 * is unclear if this is actually needed.
398 * If neither side is open be sure to clear any left over
399 * ZOMBIE state before continuing.
402 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
403 else if ((pti->pt_flags & PF_SOPEN) == 0)
404 tp->t_state &= ~TS_ZOMBIE;
407 * Wait for the carrier (ptc side)
409 while ((tp->t_state & TS_CARR_ON) == 0) {
410 if (ap->a_oflags & FNONBLOCK)
412 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
415 lwkt_reltoken(&tty_token);
421 * Mark the tty open and mark the slave side as being open.
423 error = (*linesw[tp->t_line].l_open)(dev, tp);
426 pti->pt_flags |= PF_SOPEN;
427 pti->pt_flags &= ~PF_SCLOSED;
428 ptcwakeup(tp, FREAD|FWRITE);
432 lwkt_reltoken(&tty_token);
437 ptsclose(struct dev_close_args *ap)
439 cdev_t dev = ap->a_head.a_dev;
441 struct pt_ioctl *pti = dev->si_drv1;
444 lwkt_gettoken(&tty_token);
446 panic("ptsclose on terminated pti");
449 * Disconnect the slave side
452 err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
453 ptsstop(tp, FREAD|FWRITE);
454 ttyclose(tp); /* clears t_state */
457 * Mark the pts side closed and signal the ptc. Do not mark the
458 * tty a zombie... that is, allow the tty to be re-opened as long
459 * as the ptc is still open. The ptc will read() EOFs until the
460 * pts side is reopened or the ptc is closed.
462 * xterm() depends on this behavior as it will revoke() the pts
463 * and then reopen it after the (unnecessary old code) chmod.
465 pti->pt_flags &= ~PF_SOPEN;
466 pti->pt_flags |= PF_SCLOSED;
468 ptcwakeup(tp, FREAD);
470 lwkt_reltoken(&tty_token);
475 ptsread(struct dev_read_args *ap)
477 cdev_t dev = ap->a_head.a_dev;
478 struct proc *p = curproc;
479 struct tty *tp = dev->si_tty;
480 struct pt_ioctl *pti = dev->si_drv1;
485 lp = curthread->td_lwp;
487 lwkt_gettoken(&tty_token);
489 if (pti->pt_flags & PF_REMOTE) {
490 while (isbackground(p, tp)) {
491 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
492 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
493 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) {
494 lwkt_reltoken(&tty_token);
497 pgsignal(p->p_pgrp, SIGTTIN, 1);
498 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
500 lwkt_reltoken(&tty_token);
504 if (tp->t_canq.c_cc == 0) {
505 if (ap->a_ioflag & IO_NDELAY) {
506 lwkt_reltoken(&tty_token);
507 return (EWOULDBLOCK);
509 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
512 lwkt_reltoken(&tty_token);
517 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
518 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
522 if (tp->t_canq.c_cc == 1)
523 clist_getc(&tp->t_canq);
524 if (tp->t_canq.c_cc) {
525 lwkt_reltoken(&tty_token);
530 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
531 ptcwakeup(tp, FWRITE);
532 lwkt_reltoken(&tty_token);
537 * Write to pseudo-tty.
538 * Wakeups of controlling tty will happen
539 * indirectly, when tty driver calls ptsstart.
542 ptswrite(struct dev_write_args *ap)
544 cdev_t dev = ap->a_head.a_dev;
548 lwkt_gettoken(&tty_token);
550 if (tp->t_oproc == 0) {
551 lwkt_reltoken(&tty_token);
554 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
555 lwkt_reltoken(&tty_token);
560 * Start output on pseudo-tty.
561 * Wake up process selecting or sleeping for input from controlling tty.
564 ptsstart(struct tty *tp)
566 lwkt_gettoken(&tty_token);
567 struct pt_ioctl *pti = tp->t_dev->si_drv1;
569 if (tp->t_state & TS_TTSTOP) {
570 lwkt_reltoken(&tty_token);
574 if (pti->pt_flags & PF_STOPPED) {
575 pti->pt_flags &= ~PF_STOPPED;
576 pti->pt_send = TIOCPKT_START;
579 ptcwakeup(tp, FREAD);
580 lwkt_reltoken(&tty_token);
584 * NOTE: Must be called with tty_token held
587 ptcwakeup(struct tty *tp, int flag)
589 ASSERT_LWKT_TOKEN_HELD(&tty_token);
592 wakeup(TSA_PTC_READ(tp));
593 KNOTE(&tp->t_rkq.ki_note, 0);
596 wakeup(TSA_PTC_WRITE(tp));
597 KNOTE(&tp->t_wkq.ki_note, 0);
602 ptcopen(struct dev_open_args *ap)
604 cdev_t dev = ap->a_head.a_dev;
606 struct pt_ioctl *pti;
609 * The pti will already be assigned by the clone code or
610 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
611 * we are somehow racing a unix98 termination.
613 if (dev->si_drv1 == NULL)
616 lwkt_gettoken(&tty_token);
619 lwkt_reltoken(&tty_token);
622 if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison) {
624 lwkt_reltoken(&tty_token);
630 lwkt_reltoken(&tty_token);
635 * If the slave side is not yet open clear any left over zombie
636 * state before doing our modem control.
638 if ((pti->pt_flags & PF_SOPEN) == 0)
639 tp->t_state &= ~TS_ZOMBIE;
641 tp->t_oproc = ptsstart;
642 tp->t_stop = ptsstop;
643 tp->t_unhold = ptsunhold;
648 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
650 tp->t_lflag &= ~EXTPROC;
651 pti->pt_prison = ap->a_cred->cr_prison;
652 pti->pt_flags &= ~PF_PTCSTATEMASK;
656 pti->devs->si_uid = ap->a_cred->cr_uid;
657 pti->devs->si_gid = 0;
658 pti->devs->si_perms = 0600;
659 pti->devc->si_uid = ap->a_cred->cr_uid;
660 pti->devc->si_gid = 0;
661 pti->devc->si_perms = 0600;
664 * Mark master side open. This does not cause any events
667 pti->pt_flags |= PF_MOPEN;
670 lwkt_reltoken(&tty_token);
675 ptcclose(struct dev_close_args *ap)
677 cdev_t dev = ap->a_head.a_dev;
679 struct pt_ioctl *pti = dev->si_drv1;
681 lwkt_gettoken(&tty_token);
683 panic("ptcclose on terminated pti");
686 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
689 * Mark the master side closed. If the slave is still open
690 * mark the tty ZOMBIE, preventing any new action until both
693 * NOTE: The ttyflush() will wake up the slave once we've
694 * set appropriate flags. The ZOMBIE flag will be
695 * cleared when the slave side is closed.
697 pti->pt_flags &= ~PF_MOPEN;
698 if (pti->pt_flags & PF_SOPEN)
699 tp->t_state |= TS_ZOMBIE;
702 * Turn off the carrier and disconnect. This will notify the slave
705 if (tp->t_state & TS_ISOPEN) {
706 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
707 ttyflush(tp, FREAD | FWRITE);
709 tp->t_oproc = NULL; /* mark closed */
711 pti->pt_prison = NULL;
712 pti->devs->si_uid = 0;
713 pti->devs->si_gid = 0;
714 pti->devs->si_perms = 0666;
715 pti->devc->si_uid = 0;
716 pti->devc->si_gid = 0;
717 pti->devc->si_perms = 0666;
721 lwkt_reltoken(&tty_token);
726 ptcread(struct dev_read_args *ap)
728 cdev_t dev = ap->a_head.a_dev;
729 struct tty *tp = dev->si_tty;
730 struct pt_ioctl *pti = dev->si_drv1;
734 lwkt_gettoken(&tty_token);
736 * We want to block until the slave
737 * is open, and there's something to read;
738 * but if we lost the slave or we're NBIO,
739 * then return the appropriate error instead.
742 if (tp->t_state&TS_ISOPEN) {
743 if ((pti->pt_flags & PF_PKT) && pti->pt_send) {
744 error = ureadc((int)pti->pt_send, ap->a_uio);
746 lwkt_reltoken(&tty_token);
749 if (pti->pt_send & TIOCPKT_IOCTL) {
750 cc = (int)szmin(ap->a_uio->uio_resid,
751 sizeof(tp->t_termios));
752 uiomove((caddr_t)&tp->t_termios, cc,
756 lwkt_reltoken(&tty_token);
759 if ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl) {
760 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
762 lwkt_reltoken(&tty_token);
766 lwkt_reltoken(&tty_token);
769 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
772 if ((tp->t_state & TS_CONNECTED) == 0) {
773 lwkt_reltoken(&tty_token);
774 return (0); /* EOF */
776 if (ap->a_ioflag & IO_NDELAY) {
777 lwkt_reltoken(&tty_token);
778 return (EWOULDBLOCK);
780 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
782 lwkt_reltoken(&tty_token);
786 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
787 error = ureadc(0, ap->a_uio);
788 while (ap->a_uio->uio_resid > 0 && error == 0) {
789 cc = q_to_b(&tp->t_outq, buf,
790 (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
793 error = uiomove(buf, (size_t)cc, ap->a_uio);
796 lwkt_reltoken(&tty_token);
801 ptsstop(struct tty *tp, int flush)
803 struct pt_ioctl *pti = tp->t_dev->si_drv1;
806 lwkt_gettoken(&tty_token);
807 /* note: FLUSHREAD and FLUSHWRITE already ok */
810 flush = TIOCPKT_STOP;
811 pti->pt_flags |= PF_STOPPED;
813 pti->pt_flags &= ~PF_STOPPED;
815 pti->pt_send |= flush;
816 /* change of perspective */
825 lwkt_reltoken(&tty_token);
829 * ttyunhold() calls us instead of just decrementing tp->t_refs. This
830 * is needed because a session can hold onto a pts (half closed state)
831 * even if there are no live file descriptors. Without the callback
835 ptsunhold(struct tty *tp)
837 struct pt_ioctl *pti = tp->t_dev->si_drv1;
839 lwkt_gettoken(&tty_token);
843 lwkt_reltoken(&tty_token);
847 * kqueue ops for pseudo-terminals.
849 static struct filterops ptcread_filtops =
850 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcrdetach, filt_ptcread };
851 static struct filterops ptcwrite_filtops =
852 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcwdetach, filt_ptcwrite };
855 ptckqfilter(struct dev_kqfilter_args *ap)
857 cdev_t dev = ap->a_head.a_dev;
858 struct knote *kn = ap->a_kn;
859 struct tty *tp = dev->si_tty;
862 lwkt_gettoken(&tty_token);
864 switch (kn->kn_filter) {
866 klist = &tp->t_rkq.ki_note;
867 kn->kn_fop = &ptcread_filtops;
870 klist = &tp->t_wkq.ki_note;
871 kn->kn_fop = &ptcwrite_filtops;
874 ap->a_result = EOPNOTSUPP;
875 lwkt_reltoken(&tty_token);
879 kn->kn_hook = (caddr_t)dev;
880 knote_insert(klist, kn);
881 lwkt_reltoken(&tty_token);
886 filt_ptcread (struct knote *kn, long hint)
888 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
889 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
891 lwkt_gettoken(&tty_token);
892 if ((tp->t_state & TS_ZOMBIE) || (pti->pt_flags & PF_SCLOSED)) {
893 kn->kn_flags |= EV_EOF;
894 lwkt_reltoken(&tty_token);
898 if ((tp->t_state & TS_ISOPEN) &&
899 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
900 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
901 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
902 kn->kn_data = tp->t_outq.c_cc;
903 lwkt_reltoken(&tty_token);
906 lwkt_reltoken(&tty_token);
912 filt_ptcwrite (struct knote *kn, long hint)
914 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
915 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
917 lwkt_gettoken(&tty_token);
918 if (tp->t_state & TS_ZOMBIE) {
919 kn->kn_flags |= EV_EOF;
920 lwkt_reltoken(&tty_token);
924 if (tp->t_state & TS_ISOPEN &&
925 ((pti->pt_flags & PF_REMOTE) ?
926 (tp->t_canq.c_cc == 0) :
927 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
928 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) {
929 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc;
930 lwkt_reltoken(&tty_token);
933 lwkt_reltoken(&tty_token);
940 filt_ptcrdetach (struct knote *kn)
942 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
944 knote_remove(&tp->t_rkq.ki_note, kn);
948 filt_ptcwdetach (struct knote *kn)
950 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
952 knote_remove(&tp->t_wkq.ki_note, kn);
959 ptcwrite(struct dev_write_args *ap)
961 cdev_t dev = ap->a_head.a_dev;
962 struct tty *tp = dev->si_tty;
965 u_char locbuf[BUFSIZ];
967 struct pt_ioctl *pti = dev->si_drv1;
970 lwkt_gettoken(&tty_token);
972 if ((tp->t_state&TS_ISOPEN) == 0)
974 if (pti->pt_flags & PF_REMOTE) {
977 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
978 tp->t_canq.c_cc < TTYHOG - 1) {
980 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
981 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
983 error = uiomove(cp, (size_t)cc, ap->a_uio);
985 lwkt_reltoken(&tty_token);
988 /* check again for safety */
989 if ((tp->t_state & TS_ISOPEN) == 0) {
990 /* adjust as usual */
991 ap->a_uio->uio_resid += cc;
992 lwkt_reltoken(&tty_token);
997 cc = b_to_q((char *)cp, cc, &tp->t_canq);
999 * XXX we don't guarantee that the canq size
1000 * is >= TTYHOG, so the above b_to_q() may
1001 * leave some bytes uncopied. However, space
1002 * is guaranteed for the null terminator if
1003 * we don't fail here since (TTYHOG - 1) is
1004 * not a multiple of CBSIZE.
1010 /* adjust for data copied in but not written */
1011 ap->a_uio->uio_resid += cc;
1012 clist_putc(0, &tp->t_canq);
1014 wakeup(TSA_PTS_READ(tp));
1015 lwkt_reltoken(&tty_token);
1018 while (ap->a_uio->uio_resid > 0 || cc > 0) {
1020 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
1022 error = uiomove(cp, (size_t)cc, ap->a_uio);
1024 lwkt_reltoken(&tty_token);
1027 /* check again for safety */
1028 if ((tp->t_state & TS_ISOPEN) == 0) {
1029 /* adjust for data copied in but not written */
1030 ap->a_uio->uio_resid += cc;
1031 lwkt_reltoken(&tty_token);
1036 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
1037 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
1038 wakeup(TSA_HUP_OR_INPUT(tp));
1041 (*linesw[tp->t_line].l_rint)(*cp++, tp);
1047 lwkt_reltoken(&tty_token);
1051 * Come here to wait for slave to open, for space
1052 * in outq, or space in rawq, or an empty canq.
1054 if ((tp->t_state & TS_CONNECTED) == 0) {
1055 /* adjust for data copied in but not written */
1056 ap->a_uio->uio_resid += cc;
1057 lwkt_reltoken(&tty_token);
1060 if (ap->a_ioflag & IO_NDELAY) {
1061 /* adjust for data copied in but not written */
1062 ap->a_uio->uio_resid += cc;
1064 lwkt_reltoken(&tty_token);
1065 return (EWOULDBLOCK);
1067 lwkt_reltoken(&tty_token);
1070 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
1072 /* adjust for data copied in but not written */
1073 ap->a_uio->uio_resid += cc;
1074 lwkt_reltoken(&tty_token);
1082 ptyioctl(struct dev_ioctl_args *ap)
1084 cdev_t dev = ap->a_head.a_dev;
1085 struct tty *tp = dev->si_tty;
1086 struct pt_ioctl *pti = dev->si_drv1;
1087 u_char *cc = tp->t_cc;
1090 lwkt_gettoken(&tty_token);
1091 if (dev_dflags(dev) & D_MASTER) {
1092 switch (ap->a_cmd) {
1096 * We avoid calling ttioctl on the controller since,
1097 * in that case, tp must be the controlling terminal.
1099 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1100 lwkt_reltoken(&tty_token);
1104 if (*(int *)ap->a_data) {
1105 if (pti->pt_flags & PF_UCNTL) {
1106 lwkt_reltoken(&tty_token);
1109 pti->pt_flags |= PF_PKT;
1111 pti->pt_flags &= ~PF_PKT;
1113 lwkt_reltoken(&tty_token);
1117 if (*(int *)ap->a_data) {
1118 if (pti->pt_flags & PF_PKT) {
1119 lwkt_reltoken(&tty_token);
1122 pti->pt_flags |= PF_UCNTL;
1124 pti->pt_flags &= ~PF_UCNTL;
1126 lwkt_reltoken(&tty_token);
1130 if (*(int *)ap->a_data)
1131 pti->pt_flags |= PF_REMOTE;
1133 pti->pt_flags &= ~PF_REMOTE;
1134 ttyflush(tp, FREAD|FWRITE);
1135 lwkt_reltoken(&tty_token);
1139 case TIOCISPTMASTER:
1140 if ((pti->pt_flags & PF_UNIX98) &&
1141 (pti->devc == dev)) {
1142 lwkt_reltoken(&tty_token);
1145 lwkt_reltoken(&tty_token);
1152 * The rest of the ioctls shouldn't be called until
1153 * the slave is open.
1155 if ((tp->t_state & TS_ISOPEN) == 0) {
1156 lwkt_reltoken(&tty_token);
1160 switch (ap->a_cmd) {
1170 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
1171 * ttywflush(tp) will hang if there are characters in
1174 ndflush(&tp->t_outq, tp->t_outq.c_cc);
1178 if (*(unsigned int *)ap->a_data >= NSIG ||
1179 *(unsigned int *)ap->a_data == 0) {
1180 lwkt_reltoken(&tty_token);
1183 if ((tp->t_lflag&NOFLSH) == 0)
1184 ttyflush(tp, FREAD|FWRITE);
1185 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
1186 if ((*(unsigned int *)ap->a_data == SIGINFO) &&
1187 ((tp->t_lflag&NOKERNINFO) == 0))
1189 lwkt_reltoken(&tty_token);
1193 if (ap->a_cmd == TIOCEXT) {
1195 * When the EXTPROC bit is being toggled, we need
1196 * to send an TIOCPKT_IOCTL if the packet driver
1199 if (*(int *)ap->a_data) {
1200 if (pti->pt_flags & PF_PKT) {
1201 pti->pt_send |= TIOCPKT_IOCTL;
1202 ptcwakeup(tp, FREAD);
1204 tp->t_lflag |= EXTPROC;
1206 if ((tp->t_lflag & EXTPROC) &&
1207 (pti->pt_flags & PF_PKT)) {
1208 pti->pt_send |= TIOCPKT_IOCTL;
1209 ptcwakeup(tp, FREAD);
1211 tp->t_lflag &= ~EXTPROC;
1213 lwkt_reltoken(&tty_token);
1216 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
1217 ap->a_fflag, ap->a_cred);
1218 if (error == ENOIOCTL)
1219 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
1220 if (error == ENOIOCTL) {
1221 if (pti->pt_flags & PF_UCNTL &&
1222 (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
1223 if (ap->a_cmd & 0xff) {
1224 pti->pt_ucntl = (u_char)ap->a_cmd;
1225 ptcwakeup(tp, FREAD);
1227 lwkt_reltoken(&tty_token);
1233 * If external processing and packet mode send ioctl packet.
1235 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
1244 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1251 pti->pt_send |= TIOCPKT_IOCTL;
1252 ptcwakeup(tp, FREAD);
1257 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
1258 && CCEQ(cc[VSTART], CTRL('q'));
1259 if (pti->pt_flags & PF_NOSTOP) {
1261 pti->pt_send &= ~TIOCPKT_NOSTOP;
1262 pti->pt_send |= TIOCPKT_DOSTOP;
1263 pti->pt_flags &= ~PF_NOSTOP;
1264 ptcwakeup(tp, FREAD);
1268 pti->pt_send &= ~TIOCPKT_DOSTOP;
1269 pti->pt_send |= TIOCPKT_NOSTOP;
1270 pti->pt_flags |= PF_NOSTOP;
1271 ptcwakeup(tp, FREAD);
1274 lwkt_reltoken(&tty_token);
1279 static void ptc_drvinit (void *unused);
1282 SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
1283 0, "Change pty debug level");
1287 ptc_drvinit(void *unused)
1294 * Create the clonable base device.
1296 make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone,
1297 0, 0, 0666, "ptmx");
1300 for (i = 0; i < 256; i++) {
1305 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)