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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 ||
494 (p->p_flags & P_PPWAIT)) {
495 lwkt_reltoken(&tty_token);
498 pgsignal(p->p_pgrp, SIGTTIN, 1);
499 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
501 lwkt_reltoken(&tty_token);
505 if (tp->t_canq.c_cc == 0) {
506 if (ap->a_ioflag & IO_NDELAY) {
507 lwkt_reltoken(&tty_token);
508 return (EWOULDBLOCK);
510 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
513 lwkt_reltoken(&tty_token);
518 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
519 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
523 if (tp->t_canq.c_cc == 1)
524 clist_getc(&tp->t_canq);
525 if (tp->t_canq.c_cc) {
526 lwkt_reltoken(&tty_token);
531 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
532 ptcwakeup(tp, FWRITE);
533 lwkt_reltoken(&tty_token);
538 * Write to pseudo-tty.
539 * Wakeups of controlling tty will happen
540 * indirectly, when tty driver calls ptsstart.
543 ptswrite(struct dev_write_args *ap)
545 cdev_t dev = ap->a_head.a_dev;
549 lwkt_gettoken(&tty_token);
551 if (tp->t_oproc == NULL) {
552 lwkt_reltoken(&tty_token);
555 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
556 lwkt_reltoken(&tty_token);
561 * Start output on pseudo-tty.
562 * Wake up process selecting or sleeping for input from controlling tty.
565 ptsstart(struct tty *tp)
567 lwkt_gettoken(&tty_token);
568 struct pt_ioctl *pti = tp->t_dev->si_drv1;
570 if (tp->t_state & TS_TTSTOP) {
571 lwkt_reltoken(&tty_token);
575 if (pti->pt_flags & PF_STOPPED) {
576 pti->pt_flags &= ~PF_STOPPED;
577 pti->pt_send = TIOCPKT_START;
580 ptcwakeup(tp, FREAD);
581 lwkt_reltoken(&tty_token);
585 * NOTE: Must be called with tty_token held
588 ptcwakeup(struct tty *tp, int flag)
590 ASSERT_LWKT_TOKEN_HELD(&tty_token);
593 wakeup(TSA_PTC_READ(tp));
594 KNOTE(&tp->t_rkq.ki_note, 0);
597 wakeup(TSA_PTC_WRITE(tp));
598 KNOTE(&tp->t_wkq.ki_note, 0);
603 ptcopen(struct dev_open_args *ap)
605 cdev_t dev = ap->a_head.a_dev;
607 struct pt_ioctl *pti;
610 * The pti will already be assigned by the clone code or
611 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
612 * we are somehow racing a unix98 termination.
614 if (dev->si_drv1 == NULL)
617 lwkt_gettoken(&tty_token);
620 lwkt_reltoken(&tty_token);
623 if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison) {
625 lwkt_reltoken(&tty_token);
631 lwkt_reltoken(&tty_token);
636 * If the slave side is not yet open clear any left over zombie
637 * state before doing our modem control.
639 if ((pti->pt_flags & PF_SOPEN) == 0)
640 tp->t_state &= ~TS_ZOMBIE;
642 tp->t_oproc = ptsstart;
643 tp->t_stop = ptsstop;
644 tp->t_unhold = ptsunhold;
649 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
651 tp->t_lflag &= ~EXTPROC;
652 pti->pt_prison = ap->a_cred->cr_prison;
653 pti->pt_flags &= ~PF_PTCSTATEMASK;
657 pti->devs->si_uid = ap->a_cred->cr_uid;
658 pti->devs->si_gid = 0;
659 pti->devs->si_perms = 0600;
660 pti->devc->si_uid = ap->a_cred->cr_uid;
661 pti->devc->si_gid = 0;
662 pti->devc->si_perms = 0600;
665 * Mark master side open. This does not cause any events
668 pti->pt_flags |= PF_MOPEN;
671 lwkt_reltoken(&tty_token);
676 ptcclose(struct dev_close_args *ap)
678 cdev_t dev = ap->a_head.a_dev;
680 struct pt_ioctl *pti = dev->si_drv1;
682 lwkt_gettoken(&tty_token);
684 panic("ptcclose on terminated pti");
687 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
690 * Mark the master side closed. If the slave is still open
691 * mark the tty ZOMBIE, preventing any new action until both
694 * NOTE: The ttyflush() will wake up the slave once we've
695 * set appropriate flags. The ZOMBIE flag will be
696 * cleared when the slave side is closed.
698 pti->pt_flags &= ~PF_MOPEN;
699 if (pti->pt_flags & PF_SOPEN)
700 tp->t_state |= TS_ZOMBIE;
703 * Turn off the carrier and disconnect. This will notify the slave
706 if (tp->t_state & TS_ISOPEN) {
707 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
708 ttyflush(tp, FREAD | FWRITE);
710 tp->t_oproc = NULL; /* mark closed */
712 pti->pt_prison = NULL;
713 pti->devs->si_uid = 0;
714 pti->devs->si_gid = 0;
715 pti->devs->si_perms = 0666;
716 pti->devc->si_uid = 0;
717 pti->devc->si_gid = 0;
718 pti->devc->si_perms = 0666;
722 lwkt_reltoken(&tty_token);
727 ptcread(struct dev_read_args *ap)
729 cdev_t dev = ap->a_head.a_dev;
730 struct tty *tp = dev->si_tty;
731 struct pt_ioctl *pti = dev->si_drv1;
735 lwkt_gettoken(&tty_token);
737 * We want to block until the slave
738 * is open, and there's something to read;
739 * but if we lost the slave or we're NBIO,
740 * then return the appropriate error instead.
743 if (tp->t_state&TS_ISOPEN) {
744 if ((pti->pt_flags & PF_PKT) && pti->pt_send) {
745 error = ureadc((int)pti->pt_send, ap->a_uio);
747 lwkt_reltoken(&tty_token);
750 if (pti->pt_send & TIOCPKT_IOCTL) {
751 cc = (int)szmin(ap->a_uio->uio_resid,
752 sizeof(tp->t_termios));
753 uiomove((caddr_t)&tp->t_termios, cc,
757 lwkt_reltoken(&tty_token);
760 if ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl) {
761 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
763 lwkt_reltoken(&tty_token);
767 lwkt_reltoken(&tty_token);
770 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
773 if ((tp->t_state & TS_CONNECTED) == 0) {
774 lwkt_reltoken(&tty_token);
775 return (0); /* EOF */
777 if (ap->a_ioflag & IO_NDELAY) {
778 lwkt_reltoken(&tty_token);
779 return (EWOULDBLOCK);
781 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
783 lwkt_reltoken(&tty_token);
787 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
788 error = ureadc(0, ap->a_uio);
789 while (ap->a_uio->uio_resid > 0 && error == 0) {
790 cc = q_to_b(&tp->t_outq, buf,
791 (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
794 error = uiomove(buf, (size_t)cc, ap->a_uio);
797 lwkt_reltoken(&tty_token);
802 ptsstop(struct tty *tp, int flush)
804 struct pt_ioctl *pti = tp->t_dev->si_drv1;
807 lwkt_gettoken(&tty_token);
808 /* note: FLUSHREAD and FLUSHWRITE already ok */
811 flush = TIOCPKT_STOP;
812 pti->pt_flags |= PF_STOPPED;
814 pti->pt_flags &= ~PF_STOPPED;
816 pti->pt_send |= flush;
817 /* change of perspective */
826 lwkt_reltoken(&tty_token);
830 * ttyunhold() calls us instead of just decrementing tp->t_refs. This
831 * is needed because a session can hold onto a pts (half closed state)
832 * even if there are no live file descriptors. Without the callback
836 ptsunhold(struct tty *tp)
838 struct pt_ioctl *pti = tp->t_dev->si_drv1;
840 lwkt_gettoken(&tty_token);
844 lwkt_reltoken(&tty_token);
848 * kqueue ops for pseudo-terminals.
850 static struct filterops ptcread_filtops =
851 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcrdetach, filt_ptcread };
852 static struct filterops ptcwrite_filtops =
853 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ptcwdetach, filt_ptcwrite };
856 ptckqfilter(struct dev_kqfilter_args *ap)
858 cdev_t dev = ap->a_head.a_dev;
859 struct knote *kn = ap->a_kn;
860 struct tty *tp = dev->si_tty;
863 lwkt_gettoken(&tty_token);
865 switch (kn->kn_filter) {
867 klist = &tp->t_rkq.ki_note;
868 kn->kn_fop = &ptcread_filtops;
871 klist = &tp->t_wkq.ki_note;
872 kn->kn_fop = &ptcwrite_filtops;
875 ap->a_result = EOPNOTSUPP;
876 lwkt_reltoken(&tty_token);
880 kn->kn_hook = (caddr_t)dev;
881 knote_insert(klist, kn);
882 lwkt_reltoken(&tty_token);
887 filt_ptcread (struct knote *kn, long hint)
889 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
890 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
892 lwkt_gettoken(&tty_token);
893 if ((tp->t_state & TS_ZOMBIE) || (pti->pt_flags & PF_SCLOSED)) {
894 kn->kn_flags |= (EV_EOF | EV_NODATA);
895 lwkt_reltoken(&tty_token);
899 if ((tp->t_state & TS_ISOPEN) &&
900 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
901 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
902 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
903 kn->kn_data = tp->t_outq.c_cc;
904 lwkt_reltoken(&tty_token);
907 lwkt_reltoken(&tty_token);
913 filt_ptcwrite (struct knote *kn, long hint)
915 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
916 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
918 lwkt_gettoken(&tty_token);
919 if (tp->t_state & TS_ZOMBIE) {
920 kn->kn_flags |= (EV_EOF | EV_NODATA);
921 lwkt_reltoken(&tty_token);
925 if (tp->t_state & TS_ISOPEN &&
926 ((pti->pt_flags & PF_REMOTE) ?
927 (tp->t_canq.c_cc == 0) :
928 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
929 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) {
930 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc;
931 lwkt_reltoken(&tty_token);
934 lwkt_reltoken(&tty_token);
941 filt_ptcrdetach (struct knote *kn)
943 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
945 knote_remove(&tp->t_rkq.ki_note, kn);
949 filt_ptcwdetach (struct knote *kn)
951 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
953 knote_remove(&tp->t_wkq.ki_note, kn);
960 ptcwrite(struct dev_write_args *ap)
962 cdev_t dev = ap->a_head.a_dev;
963 struct tty *tp = dev->si_tty;
966 u_char locbuf[BUFSIZ];
968 struct pt_ioctl *pti = dev->si_drv1;
971 lwkt_gettoken(&tty_token);
973 if ((tp->t_state&TS_ISOPEN) == 0)
975 if (pti->pt_flags & PF_REMOTE) {
978 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
979 tp->t_canq.c_cc < TTYHOG - 1) {
981 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
982 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
984 error = uiomove(cp, (size_t)cc, ap->a_uio);
986 lwkt_reltoken(&tty_token);
989 /* check again for safety */
990 if ((tp->t_state & TS_ISOPEN) == 0) {
991 /* adjust as usual */
992 ap->a_uio->uio_resid += cc;
993 lwkt_reltoken(&tty_token);
998 cc = b_to_q((char *)cp, cc, &tp->t_canq);
1000 * XXX we don't guarantee that the canq size
1001 * is >= TTYHOG, so the above b_to_q() may
1002 * leave some bytes uncopied. However, space
1003 * is guaranteed for the null terminator if
1004 * we don't fail here since (TTYHOG - 1) is
1005 * not a multiple of CBSIZE.
1011 /* adjust for data copied in but not written */
1012 ap->a_uio->uio_resid += cc;
1013 clist_putc(0, &tp->t_canq);
1015 wakeup(TSA_PTS_READ(tp));
1016 lwkt_reltoken(&tty_token);
1019 while (ap->a_uio->uio_resid > 0 || cc > 0) {
1021 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
1023 error = uiomove(cp, (size_t)cc, ap->a_uio);
1025 lwkt_reltoken(&tty_token);
1028 /* check again for safety */
1029 if ((tp->t_state & TS_ISOPEN) == 0) {
1030 /* adjust for data copied in but not written */
1031 ap->a_uio->uio_resid += cc;
1032 lwkt_reltoken(&tty_token);
1037 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
1038 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
1039 wakeup(TSA_HUP_OR_INPUT(tp));
1042 (*linesw[tp->t_line].l_rint)(*cp++, tp);
1048 lwkt_reltoken(&tty_token);
1052 * Come here to wait for slave to open, for space
1053 * in outq, or space in rawq, or an empty canq.
1055 if ((tp->t_state & TS_CONNECTED) == 0) {
1056 /* adjust for data copied in but not written */
1057 ap->a_uio->uio_resid += cc;
1058 lwkt_reltoken(&tty_token);
1061 if (ap->a_ioflag & IO_NDELAY) {
1062 /* adjust for data copied in but not written */
1063 ap->a_uio->uio_resid += cc;
1065 lwkt_reltoken(&tty_token);
1066 return (EWOULDBLOCK);
1068 lwkt_reltoken(&tty_token);
1071 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
1073 /* adjust for data copied in but not written */
1074 ap->a_uio->uio_resid += cc;
1075 lwkt_reltoken(&tty_token);
1083 ptyioctl(struct dev_ioctl_args *ap)
1085 cdev_t dev = ap->a_head.a_dev;
1086 struct tty *tp = dev->si_tty;
1087 struct pt_ioctl *pti = dev->si_drv1;
1088 u_char *cc = tp->t_cc;
1091 lwkt_gettoken(&tty_token);
1092 if (dev_dflags(dev) & D_MASTER) {
1093 switch (ap->a_cmd) {
1097 * We avoid calling ttioctl on the controller since,
1098 * in that case, tp must be the controlling terminal.
1100 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1101 lwkt_reltoken(&tty_token);
1105 if (*(int *)ap->a_data) {
1106 if (pti->pt_flags & PF_UCNTL) {
1107 lwkt_reltoken(&tty_token);
1110 pti->pt_flags |= PF_PKT;
1112 pti->pt_flags &= ~PF_PKT;
1114 lwkt_reltoken(&tty_token);
1118 if (*(int *)ap->a_data) {
1119 if (pti->pt_flags & PF_PKT) {
1120 lwkt_reltoken(&tty_token);
1123 pti->pt_flags |= PF_UCNTL;
1125 pti->pt_flags &= ~PF_UCNTL;
1127 lwkt_reltoken(&tty_token);
1131 if (*(int *)ap->a_data)
1132 pti->pt_flags |= PF_REMOTE;
1134 pti->pt_flags &= ~PF_REMOTE;
1135 ttyflush(tp, FREAD|FWRITE);
1136 lwkt_reltoken(&tty_token);
1140 case TIOCISPTMASTER:
1141 if ((pti->pt_flags & PF_UNIX98) &&
1142 (pti->devc == dev)) {
1143 lwkt_reltoken(&tty_token);
1146 lwkt_reltoken(&tty_token);
1153 * The rest of the ioctls shouldn't be called until
1154 * the slave is open.
1156 if ((tp->t_state & TS_ISOPEN) == 0) {
1157 lwkt_reltoken(&tty_token);
1161 switch (ap->a_cmd) {
1171 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
1172 * ttywflush(tp) will hang if there are characters in
1175 ndflush(&tp->t_outq, tp->t_outq.c_cc);
1179 if (*(unsigned int *)ap->a_data >= NSIG ||
1180 *(unsigned int *)ap->a_data == 0) {
1181 lwkt_reltoken(&tty_token);
1184 if ((tp->t_lflag&NOFLSH) == 0)
1185 ttyflush(tp, FREAD|FWRITE);
1186 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
1187 if ((*(unsigned int *)ap->a_data == SIGINFO) &&
1188 ((tp->t_lflag&NOKERNINFO) == 0))
1190 lwkt_reltoken(&tty_token);
1194 if (ap->a_cmd == TIOCEXT) {
1196 * When the EXTPROC bit is being toggled, we need
1197 * to send an TIOCPKT_IOCTL if the packet driver
1200 if (*(int *)ap->a_data) {
1201 if (pti->pt_flags & PF_PKT) {
1202 pti->pt_send |= TIOCPKT_IOCTL;
1203 ptcwakeup(tp, FREAD);
1205 tp->t_lflag |= EXTPROC;
1207 if ((tp->t_lflag & EXTPROC) &&
1208 (pti->pt_flags & PF_PKT)) {
1209 pti->pt_send |= TIOCPKT_IOCTL;
1210 ptcwakeup(tp, FREAD);
1212 tp->t_lflag &= ~EXTPROC;
1214 lwkt_reltoken(&tty_token);
1217 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
1218 ap->a_fflag, ap->a_cred);
1219 if (error == ENOIOCTL)
1220 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
1221 if (error == ENOIOCTL) {
1222 if (pti->pt_flags & PF_UCNTL &&
1223 (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
1224 if (ap->a_cmd & 0xff) {
1225 pti->pt_ucntl = (u_char)ap->a_cmd;
1226 ptcwakeup(tp, FREAD);
1228 lwkt_reltoken(&tty_token);
1234 * If external processing and packet mode send ioctl packet.
1236 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
1245 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1252 pti->pt_send |= TIOCPKT_IOCTL;
1253 ptcwakeup(tp, FREAD);
1258 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
1259 && CCEQ(cc[VSTART], CTRL('q'));
1260 if (pti->pt_flags & PF_NOSTOP) {
1262 pti->pt_send &= ~TIOCPKT_NOSTOP;
1263 pti->pt_send |= TIOCPKT_DOSTOP;
1264 pti->pt_flags &= ~PF_NOSTOP;
1265 ptcwakeup(tp, FREAD);
1269 pti->pt_send &= ~TIOCPKT_DOSTOP;
1270 pti->pt_send |= TIOCPKT_NOSTOP;
1271 pti->pt_flags |= PF_NOSTOP;
1272 ptcwakeup(tp, FREAD);
1275 lwkt_reltoken(&tty_token);
1280 static void ptc_drvinit (void *unused);
1283 SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
1284 0, "Change pty debug level");
1288 ptc_drvinit(void *unused)
1295 * Create the clonable base device.
1297 make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone,
1298 0, 0, 0666, "ptmx");
1301 for (i = 0; i < 256; i++) {
1306 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)