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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 $
37 * $DragonFly: src/sys/kern/tty_pty.c,v 1.21 2008/08/13 10:29:38 swildner Exp $
42 * Most functions here could use a separate lock to deal with concurrent
43 * access to the 'pt's.
45 * Right now the tty_token must be held for all this.
49 * Pseudo-teletype Driver
50 * (Actually two drivers, requiring two dev_ops structures)
52 #include "use_pty.h" /* XXX */
53 #include "opt_compat.h"
55 #include <sys/param.h>
56 #include <sys/systm.h>
57 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
58 #include <sys/ioctl_compat.h>
64 #include <sys/fcntl.h>
65 #include <sys/kernel.h>
66 #include <sys/vnode.h>
67 #include <sys/signalvar.h>
68 #include <sys/malloc.h>
69 #include <sys/device.h>
70 #include <sys/thread2.h>
71 #include <sys/devfs.h>
73 #include <sys/sysctl.h>
77 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
79 static void ptsstart (struct tty *tp);
80 static void ptsstop (struct tty *tp, int rw);
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 },
113 .d_kqfilter = ttykqfilter,
114 .d_revoke = ttyrevoke
117 static struct dev_ops ptc98_ops = {
118 { "ptc98", 0, D_TTY | D_MASTER },
124 .d_kqfilter = ptckqfilter,
125 .d_revoke = ttyrevoke
129 #define CDEV_MAJOR_S 5
130 static struct dev_ops pts_ops = {
131 { "pts", CDEV_MAJOR_S, D_TTY },
137 .d_kqfilter = ttykqfilter,
138 .d_revoke = ttyrevoke
141 #define CDEV_MAJOR_C 6
142 static struct dev_ops ptc_ops = {
143 { "ptc", CDEV_MAJOR_C, D_TTY | D_MASTER },
149 .d_kqfilter = ptckqfilter,
150 .d_revoke = ttyrevoke
153 #define BUFSIZ 100 /* Chunk size iomoved to/from user */
158 int pt_refs; /* Structural references interlock S/MOPEN */
160 struct kqinfo pt_kqr, pt_kqw;
165 struct prison *pt_prison;
168 #define PF_PKT 0x08 /* packet mode */
169 #define PF_STOPPED 0x10 /* user told stopped */
170 #define PF_REMOTE 0x20 /* remote and flow controlled input */
171 #define PF_NOSTOP 0x40
172 #define PF_UCNTL 0x80 /* user control mode */
174 #define PF_UNIX98 0x01
175 #define PF_SOPEN 0x02
176 #define PF_MOPEN 0x04
177 #define PF_TERMINATED 0x08
180 ptydebug(int level, char *fmt, ...)
185 if (level <= pty_debug_level)
193 * This function creates and initializes a pts/ptc pair
195 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
196 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
198 * XXX: define and add mapping of upper minor bits to allow more
205 char *names = "pqrsPQRS";
208 /* For now we only map the lower 8 bits of the minor */
212 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
213 pt->devs = devs = make_dev(&pts_ops, n,
214 0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
215 pt->devc = devc = make_dev(&ptc_ops, n,
216 0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
218 pt->pt_tty.t_dev = devs;
220 devs->si_drv1 = devc->si_drv1 = pt;
221 devs->si_tty = devc->si_tty = &pt->pt_tty;
222 devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
223 devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
224 ttyregister(&pt->pt_tty);
229 ptyclone(struct dev_clone_args *ap)
235 * Limit the number of unix98 pty (slave) devices to 1000, as
236 * the utmp(5) format only allows for 8 bytes for the tty,
238 * If this limit is reached, we don't clone and return error
241 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 1000);
248 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
250 pt->devc = make_only_dev(&ptc98_ops, unit,
252 0, 0600, "ptm/%d", unit);
253 pt->devs = make_dev(&pts98_ops, unit,
255 GID_TTY, 0620, "pts/%d", unit);
256 ap->a_dev = pt->devc;
258 pt->devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
259 pt->devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
261 pt->pt_tty.t_dev = pt->devs;
262 pt->pt_flags2 |= PF_UNIX98;
263 pt->pt_uminor = unit;
264 pt->devs->si_drv1 = pt->devc->si_drv1 = pt;
265 pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty;
267 ttyregister(&pt->pt_tty);
274 * pti_hold() prevents the pti from being destroyed due to a termination
275 * while a pt*open() is blocked.
277 * This function returns non-zero if we cannot hold due to a termination
280 * NOTE: Must be called with tty_token held
283 pti_hold(struct pt_ioctl *pti)
285 if (pti->pt_flags2 & PF_TERMINATED)
292 * pti_done() releases the reference and checks to see if both sides have
293 * been closed on a unix98 pty, allowing us to destroy the device and
296 * We do not release resources on non-unix98 ptys. Those are left
297 * statically allocated.
300 pti_done(struct pt_ioctl *pti)
302 lwkt_gettoken(&tty_token);
303 if (--pti->pt_refs == 0) {
309 * Only unix09 ptys are freed up
311 if ((pti->pt_flags2 & PF_UNIX98) == 0) {
312 lwkt_reltoken(&tty_token);
317 * Interlock open attempts against termination by setting
318 * PF_TERMINATED. This allows us to block while cleaning
319 * out the device infrastructure.
321 * Do not terminate the tty if it still has a session
322 * association (t_refs).
324 if ((pti->pt_flags2 & (PF_SOPEN|PF_MOPEN)) == 0 &&
325 pti->pt_tty.t_refs == 0) {
326 pti->pt_flags2 |= PF_TERMINATED;
327 uminor_no = pti->pt_uminor;
329 if ((dev = pti->devs) != NULL) {
334 if ((dev = pti->devc) != NULL) {
339 ttyunregister(&pti->pt_tty);
340 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty),
346 lwkt_reltoken(&tty_token);
351 ptsopen(struct dev_open_args *ap)
353 cdev_t dev = ap->a_head.a_dev;
356 struct pt_ioctl *pti;
359 * The pti will already be assigned by the clone code or
360 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
361 * we are somehow racing a unix98 termination.
363 if (dev->si_drv1 == NULL)
367 lwkt_gettoken(&tty_token);
369 lwkt_reltoken(&tty_token);
373 if ((tp->t_state & TS_ISOPEN) == 0) {
374 ttychars(tp); /* Set up default chars */
375 tp->t_iflag = TTYDEF_IFLAG;
376 tp->t_oflag = TTYDEF_OFLAG;
377 tp->t_lflag = TTYDEF_LFLAG;
378 tp->t_cflag = TTYDEF_CFLAG;
379 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
380 } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
382 lwkt_reltoken(&tty_token);
384 } else if (pti->pt_prison != ap->a_cred->cr_prison) {
386 lwkt_reltoken(&tty_token);
389 if (tp->t_oproc) /* Ctrlr still around. */
390 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
391 while ((tp->t_state & TS_CARR_ON) == 0) {
392 if (ap->a_oflags & FNONBLOCK)
394 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
397 lwkt_reltoken(&tty_token);
401 tp->t_state &= ~TS_ZOMBIE;
402 error = (*linesw[tp->t_line].l_open)(dev, tp);
404 ptcwakeup(tp, FREAD|FWRITE);
409 * On open of the slave, we set the corresponding flag in the common
412 ptydebug(1, "ptsopen=%s | unix98? %s\n", dev->si_name,
413 (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
415 if (error == 0 && (pti->pt_flags2 & PF_UNIX98)) {
416 pti->pt_flags2 |= PF_SOPEN;
421 lwkt_reltoken(&tty_token);
426 ptsclose(struct dev_close_args *ap)
428 cdev_t dev = ap->a_head.a_dev;
430 struct pt_ioctl *pti = dev->si_drv1;
433 lwkt_gettoken(&tty_token);
435 panic("ptsclose on terminated pti");
437 err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
438 ptsstop(tp, FREAD|FWRITE);
439 (void) ttyclose(tp); /* clears t_state */
440 tp->t_state |= TS_ZOMBIE;
445 * On close of the slave, we unset the corresponding flag, and if the master
446 * isn't open anymore, we destroy the slave and unset the unit.
448 ptydebug(1, "ptsclose=%s | unix98? %s\n", dev->si_name,
449 (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
451 if (pti->pt_flags2 & PF_UNIX98) {
452 pti->pt_flags2 &= ~PF_SOPEN;
453 KKASSERT((pti->pt_flags2 & PF_SOPEN) == 0);
454 ptydebug(1, "master open? %s\n",
455 (pti->pt_flags2 & PF_MOPEN)?"yes":"no");
459 lwkt_reltoken(&tty_token);
464 ptsread(struct dev_read_args *ap)
466 cdev_t dev = ap->a_head.a_dev;
467 struct proc *p = curproc;
468 struct tty *tp = dev->si_tty;
469 struct pt_ioctl *pti = dev->si_drv1;
474 lp = curthread->td_lwp;
476 lwkt_gettoken(&tty_token);
478 if (pti->pt_flags & PF_REMOTE) {
479 while (isbackground(p, tp)) {
480 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
481 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
482 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) {
483 lwkt_reltoken(&tty_token);
486 pgsignal(p->p_pgrp, SIGTTIN, 1);
487 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
489 lwkt_reltoken(&tty_token);
493 if (tp->t_canq.c_cc == 0) {
494 if (ap->a_ioflag & IO_NDELAY) {
495 lwkt_reltoken(&tty_token);
496 return (EWOULDBLOCK);
498 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
501 lwkt_reltoken(&tty_token);
506 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
507 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
511 if (tp->t_canq.c_cc == 1)
512 clist_getc(&tp->t_canq);
513 if (tp->t_canq.c_cc) {
514 lwkt_reltoken(&tty_token);
519 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
520 ptcwakeup(tp, FWRITE);
521 lwkt_reltoken(&tty_token);
526 * Write to pseudo-tty.
527 * Wakeups of controlling tty will happen
528 * indirectly, when tty driver calls ptsstart.
531 ptswrite(struct dev_write_args *ap)
533 cdev_t dev = ap->a_head.a_dev;
537 lwkt_gettoken(&tty_token);
539 if (tp->t_oproc == 0) {
540 lwkt_reltoken(&tty_token);
543 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
544 lwkt_reltoken(&tty_token);
549 * Start output on pseudo-tty.
550 * Wake up process selecting or sleeping for input from controlling tty.
553 ptsstart(struct tty *tp)
555 lwkt_gettoken(&tty_token);
556 struct pt_ioctl *pti = tp->t_dev->si_drv1;
558 if (tp->t_state & TS_TTSTOP)
561 if (pti->pt_flags & PF_STOPPED) {
562 pti->pt_flags &= ~PF_STOPPED;
563 pti->pt_send = TIOCPKT_START;
566 ptcwakeup(tp, FREAD);
567 lwkt_reltoken(&tty_token);
571 * NOTE: Must be called with tty_token held
574 ptcwakeup(struct tty *tp, int flag)
576 ASSERT_LWKT_TOKEN_HELD(&tty_token);
579 wakeup(TSA_PTC_READ(tp));
580 KNOTE(&tp->t_rkq.ki_note, 0);
583 wakeup(TSA_PTC_WRITE(tp));
584 KNOTE(&tp->t_wkq.ki_note, 0);
589 ptcopen(struct dev_open_args *ap)
591 cdev_t dev = ap->a_head.a_dev;
593 struct pt_ioctl *pti;
596 * The pti will already be assigned by the clone code or
597 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
598 * we are somehow racing a unix98 termination.
600 if (dev->si_drv1 == NULL)
603 lwkt_gettoken(&tty_token);
606 lwkt_reltoken(&tty_token);
609 if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison) {
611 lwkt_reltoken(&tty_token);
617 lwkt_reltoken(&tty_token);
620 tp->t_oproc = ptsstart;
621 tp->t_stop = ptsstop;
622 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
623 tp->t_lflag &= ~EXTPROC;
624 pti->pt_prison = ap->a_cred->cr_prison;
629 pti->devs->si_uid = ap->a_cred->cr_uid;
630 pti->devs->si_gid = 0;
631 pti->devs->si_perms = 0600;
632 pti->devc->si_uid = ap->a_cred->cr_uid;
633 pti->devc->si_gid = 0;
634 pti->devc->si_perms = 0600;
639 * On open of the master, we set the corresponding flag in the common
642 ptydebug(1, "ptcopen=%s (master) | unix98? %s\n", dev->si_name,
643 (pti->pt_flags2 & PF_UNIX98)?"yes":"no");
645 if (pti->pt_flags2 & PF_UNIX98) {
646 pti->pt_flags2 |= PF_MOPEN;
651 lwkt_reltoken(&tty_token);
656 ptcclose(struct dev_close_args *ap)
658 cdev_t dev = ap->a_head.a_dev;
660 struct pt_ioctl *pti = dev->si_drv1;
662 lwkt_gettoken(&tty_token);
664 panic("ptcclose on terminated pti");
667 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
670 * XXX MDMBUF makes no sense for ptys but would inhibit the above
671 * l_modem(). CLOCAL makes sense but isn't supported. Special
672 * l_modem()s that ignore carrier drop make no sense for ptys but
673 * may be in use because other parts of the line discipline make
674 * sense for ptys. Recover by doing everything that a normal
675 * ttymodem() would have done except for sending a SIGHUP.
677 if (tp->t_state & TS_ISOPEN) {
678 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
679 tp->t_state |= TS_ZOMBIE;
680 ttyflush(tp, FREAD | FWRITE);
682 tp->t_oproc = 0; /* mark closed */
687 * On close of the master, we unset the corresponding flag in the common
690 pti->pt_flags2 &= ~PF_MOPEN;
693 pti->pt_prison = NULL;
694 pti->devs->si_uid = 0;
695 pti->devs->si_gid = 0;
696 pti->devs->si_perms = 0666;
697 pti->devc->si_uid = 0;
698 pti->devc->si_gid = 0;
699 pti->devc->si_perms = 0666;
703 lwkt_reltoken(&tty_token);
708 ptcread(struct dev_read_args *ap)
710 cdev_t dev = ap->a_head.a_dev;
711 struct tty *tp = dev->si_tty;
712 struct pt_ioctl *pti = dev->si_drv1;
716 lwkt_gettoken(&tty_token);
718 * We want to block until the slave
719 * is open, and there's something to read;
720 * but if we lost the slave or we're NBIO,
721 * then return the appropriate error instead.
724 if (tp->t_state&TS_ISOPEN) {
725 if (pti->pt_flags&PF_PKT && pti->pt_send) {
726 error = ureadc((int)pti->pt_send, ap->a_uio);
728 lwkt_reltoken(&tty_token);
731 if (pti->pt_send & TIOCPKT_IOCTL) {
732 cc = (int)szmin(ap->a_uio->uio_resid,
733 sizeof(tp->t_termios));
734 uiomove((caddr_t)&tp->t_termios, cc,
738 lwkt_reltoken(&tty_token);
741 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
742 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
744 lwkt_reltoken(&tty_token);
748 lwkt_reltoken(&tty_token);
751 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
754 if ((tp->t_state & TS_CONNECTED) == 0) {
755 lwkt_reltoken(&tty_token);
756 return (0); /* EOF */
758 if (ap->a_ioflag & IO_NDELAY) {
759 lwkt_reltoken(&tty_token);
760 return (EWOULDBLOCK);
762 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
764 lwkt_reltoken(&tty_token);
768 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
769 error = ureadc(0, ap->a_uio);
770 while (ap->a_uio->uio_resid > 0 && error == 0) {
771 cc = q_to_b(&tp->t_outq, buf,
772 (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
775 error = uiomove(buf, (size_t)cc, ap->a_uio);
778 lwkt_reltoken(&tty_token);
783 ptsstop(struct tty *tp, int flush)
785 struct pt_ioctl *pti = tp->t_dev->si_drv1;
788 lwkt_gettoken(&tty_token);
789 /* note: FLUSHREAD and FLUSHWRITE already ok */
792 flush = TIOCPKT_STOP;
793 pti->pt_flags |= PF_STOPPED;
795 pti->pt_flags &= ~PF_STOPPED;
797 pti->pt_send |= flush;
798 /* change of perspective */
807 lwkt_reltoken(&tty_token);
811 * kqueue ops for pseudo-terminals.
813 static struct filterops ptcread_filtops =
814 { FILTEROP_ISFD, NULL, filt_ptcrdetach, filt_ptcread };
815 static struct filterops ptcwrite_filtops =
816 { FILTEROP_ISFD, NULL, filt_ptcwdetach, filt_ptcwrite };
819 ptckqfilter(struct dev_kqfilter_args *ap)
821 cdev_t dev = ap->a_head.a_dev;
822 struct knote *kn = ap->a_kn;
823 struct tty *tp = dev->si_tty;
826 lwkt_gettoken(&tty_token);
828 switch (kn->kn_filter) {
830 klist = &tp->t_rkq.ki_note;
831 kn->kn_fop = &ptcread_filtops;
834 klist = &tp->t_wkq.ki_note;
835 kn->kn_fop = &ptcwrite_filtops;
838 ap->a_result = EOPNOTSUPP;
839 lwkt_reltoken(&tty_token);
843 kn->kn_hook = (caddr_t)dev;
844 knote_insert(klist, kn);
845 lwkt_reltoken(&tty_token);
850 filt_ptcread (struct knote *kn, long hint)
852 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
853 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
855 lwkt_gettoken(&tty_token);
856 if (tp->t_state & TS_ZOMBIE) {
857 kn->kn_flags |= EV_EOF;
858 lwkt_reltoken(&tty_token);
862 if ((tp->t_state & TS_ISOPEN) &&
863 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
864 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
865 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
866 kn->kn_data = tp->t_outq.c_cc;
867 lwkt_reltoken(&tty_token);
870 lwkt_reltoken(&tty_token);
876 filt_ptcwrite (struct knote *kn, long hint)
878 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
879 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
881 lwkt_gettoken(&tty_token);
882 if (tp->t_state & TS_ZOMBIE) {
883 kn->kn_flags |= EV_EOF;
884 lwkt_reltoken(&tty_token);
888 if (tp->t_state & TS_ISOPEN &&
889 ((pti->pt_flags & PF_REMOTE) ?
890 (tp->t_canq.c_cc == 0) :
891 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
892 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) {
893 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc;
894 lwkt_reltoken(&tty_token);
897 lwkt_reltoken(&tty_token);
904 filt_ptcrdetach (struct knote *kn)
906 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
908 knote_remove(&tp->t_rkq.ki_note, kn);
912 filt_ptcwdetach (struct knote *kn)
914 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
916 knote_remove(&tp->t_wkq.ki_note, kn);
923 ptcwrite(struct dev_write_args *ap)
925 cdev_t dev = ap->a_head.a_dev;
926 struct tty *tp = dev->si_tty;
929 u_char locbuf[BUFSIZ];
931 struct pt_ioctl *pti = dev->si_drv1;
934 lwkt_gettoken(&tty_token);
936 if ((tp->t_state&TS_ISOPEN) == 0)
938 if (pti->pt_flags & PF_REMOTE) {
941 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
942 tp->t_canq.c_cc < TTYHOG - 1) {
944 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
945 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
947 error = uiomove(cp, (size_t)cc, ap->a_uio);
949 lwkt_reltoken(&tty_token);
952 /* check again for safety */
953 if ((tp->t_state & TS_ISOPEN) == 0) {
954 /* adjust as usual */
955 ap->a_uio->uio_resid += cc;
956 lwkt_reltoken(&tty_token);
961 cc = b_to_q((char *)cp, cc, &tp->t_canq);
963 * XXX we don't guarantee that the canq size
964 * is >= TTYHOG, so the above b_to_q() may
965 * leave some bytes uncopied. However, space
966 * is guaranteed for the null terminator if
967 * we don't fail here since (TTYHOG - 1) is
968 * not a multiple of CBSIZE.
974 /* adjust for data copied in but not written */
975 ap->a_uio->uio_resid += cc;
976 clist_putc(0, &tp->t_canq);
978 wakeup(TSA_PTS_READ(tp));
979 lwkt_reltoken(&tty_token);
982 while (ap->a_uio->uio_resid > 0 || cc > 0) {
984 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
986 error = uiomove(cp, (size_t)cc, ap->a_uio);
988 lwkt_reltoken(&tty_token);
991 /* check again for safety */
992 if ((tp->t_state & TS_ISOPEN) == 0) {
993 /* adjust for data copied in but not written */
994 ap->a_uio->uio_resid += cc;
995 lwkt_reltoken(&tty_token);
1000 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
1001 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
1002 wakeup(TSA_HUP_OR_INPUT(tp));
1005 (*linesw[tp->t_line].l_rint)(*cp++, tp);
1011 lwkt_reltoken(&tty_token);
1015 * Come here to wait for slave to open, for space
1016 * in outq, or space in rawq, or an empty canq.
1018 if ((tp->t_state & TS_CONNECTED) == 0) {
1019 /* adjust for data copied in but not written */
1020 ap->a_uio->uio_resid += cc;
1021 lwkt_reltoken(&tty_token);
1024 if (ap->a_ioflag & IO_NDELAY) {
1025 /* adjust for data copied in but not written */
1026 ap->a_uio->uio_resid += cc;
1028 lwkt_reltoken(&tty_token);
1029 return (EWOULDBLOCK);
1031 lwkt_reltoken(&tty_token);
1034 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
1036 /* adjust for data copied in but not written */
1037 ap->a_uio->uio_resid += cc;
1038 lwkt_reltoken(&tty_token);
1046 ptyioctl(struct dev_ioctl_args *ap)
1048 cdev_t dev = ap->a_head.a_dev;
1049 struct tty *tp = dev->si_tty;
1050 struct pt_ioctl *pti = dev->si_drv1;
1051 u_char *cc = tp->t_cc;
1054 lwkt_gettoken(&tty_token);
1055 if (dev_dflags(dev) & D_MASTER) {
1056 switch (ap->a_cmd) {
1060 * We avoid calling ttioctl on the controller since,
1061 * in that case, tp must be the controlling terminal.
1063 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1064 lwkt_reltoken(&tty_token);
1068 if (*(int *)ap->a_data) {
1069 if (pti->pt_flags & PF_UCNTL) {
1070 lwkt_reltoken(&tty_token);
1073 pti->pt_flags |= PF_PKT;
1075 pti->pt_flags &= ~PF_PKT;
1076 lwkt_reltoken(&tty_token);
1080 if (*(int *)ap->a_data) {
1081 if (pti->pt_flags & PF_PKT) {
1082 lwkt_reltoken(&tty_token);
1085 pti->pt_flags |= PF_UCNTL;
1087 pti->pt_flags &= ~PF_UCNTL;
1088 lwkt_reltoken(&tty_token);
1092 if (*(int *)ap->a_data)
1093 pti->pt_flags |= PF_REMOTE;
1095 pti->pt_flags &= ~PF_REMOTE;
1096 ttyflush(tp, FREAD|FWRITE);
1097 lwkt_reltoken(&tty_token);
1101 case TIOCISPTMASTER:
1102 if ((pti->pt_flags2 & PF_UNIX98) && (pti->devc == dev)) {
1103 lwkt_reltoken(&tty_token);
1106 lwkt_reltoken(&tty_token);
1113 * The rest of the ioctls shouldn't be called until
1114 * the slave is open.
1116 if ((tp->t_state & TS_ISOPEN) == 0) {
1117 lwkt_reltoken(&tty_token);
1121 switch (ap->a_cmd) {
1131 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
1132 * ttywflush(tp) will hang if there are characters in
1135 ndflush(&tp->t_outq, tp->t_outq.c_cc);
1139 if (*(unsigned int *)ap->a_data >= NSIG ||
1140 *(unsigned int *)ap->a_data == 0) {
1141 lwkt_reltoken(&tty_token);
1144 if ((tp->t_lflag&NOFLSH) == 0)
1145 ttyflush(tp, FREAD|FWRITE);
1146 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
1147 if ((*(unsigned int *)ap->a_data == SIGINFO) &&
1148 ((tp->t_lflag&NOKERNINFO) == 0))
1150 lwkt_reltoken(&tty_token);
1154 if (ap->a_cmd == TIOCEXT) {
1156 * When the EXTPROC bit is being toggled, we need
1157 * to send an TIOCPKT_IOCTL if the packet driver
1160 if (*(int *)ap->a_data) {
1161 if (pti->pt_flags & PF_PKT) {
1162 pti->pt_send |= TIOCPKT_IOCTL;
1163 ptcwakeup(tp, FREAD);
1165 tp->t_lflag |= EXTPROC;
1167 if ((tp->t_lflag & EXTPROC) &&
1168 (pti->pt_flags & PF_PKT)) {
1169 pti->pt_send |= TIOCPKT_IOCTL;
1170 ptcwakeup(tp, FREAD);
1172 tp->t_lflag &= ~EXTPROC;
1174 lwkt_reltoken(&tty_token);
1177 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
1178 ap->a_fflag, ap->a_cred);
1179 if (error == ENOIOCTL)
1180 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
1181 if (error == ENOIOCTL) {
1182 if (pti->pt_flags & PF_UCNTL &&
1183 (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
1184 if (ap->a_cmd & 0xff) {
1185 pti->pt_ucntl = (u_char)ap->a_cmd;
1186 ptcwakeup(tp, FREAD);
1188 lwkt_reltoken(&tty_token);
1194 * If external processing and packet mode send ioctl packet.
1196 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
1205 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1212 pti->pt_send |= TIOCPKT_IOCTL;
1213 ptcwakeup(tp, FREAD);
1218 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
1219 && CCEQ(cc[VSTART], CTRL('q'));
1220 if (pti->pt_flags & PF_NOSTOP) {
1222 pti->pt_send &= ~TIOCPKT_NOSTOP;
1223 pti->pt_send |= TIOCPKT_DOSTOP;
1224 pti->pt_flags &= ~PF_NOSTOP;
1225 ptcwakeup(tp, FREAD);
1229 pti->pt_send &= ~TIOCPKT_DOSTOP;
1230 pti->pt_send |= TIOCPKT_NOSTOP;
1231 pti->pt_flags |= PF_NOSTOP;
1232 ptcwakeup(tp, FREAD);
1235 lwkt_reltoken(&tty_token);
1240 static void ptc_drvinit (void *unused);
1243 SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
1244 0, "Change pty debug level");
1248 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");
1261 for (i = 0; i < 256; i++) {
1266 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)