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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 * This function creates and initializes a pts/ptc pair
182 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
183 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
185 * XXX: define and add mapping of upper minor bits to allow more
192 char *names = "pqrsPQRS";
195 /* For now we only map the lower 8 bits of the minor */
199 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
200 pt->devs = devs = make_dev(&pts_ops, n,
201 0, 0, 0666, "tty%c%r", names[n / 32], n % 32);
202 pt->devc = devc = make_dev(&ptc_ops, n,
203 0, 0, 0666, "pty%c%r", names[n / 32], n % 32);
205 pt->pt_tty.t_dev = devs;
207 devs->si_drv1 = devc->si_drv1 = pt;
208 devs->si_tty = devc->si_tty = &pt->pt_tty;
209 devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
210 devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
211 ttyregister(&pt->pt_tty);
216 ptyclone(struct dev_clone_args *ap)
222 * Limit the number of unix98 pty (slave) devices to 1000, as
223 * the utmp(5) format only allows for 8 bytes for the tty,
225 * If this limit is reached, we don't clone and return error
228 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 1000);
235 pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
237 pt->devc = make_only_dev(&ptc98_ops, unit,
239 0, 0600, "ptm/%d", unit);
240 pt->devs = make_dev(&pts98_ops, unit,
242 GID_TTY, 0620, "pts/%d", unit);
243 ap->a_dev = pt->devc;
245 pt->devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
246 pt->devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */
248 pt->pt_tty.t_dev = pt->devs;
249 pt->pt_flags2 |= PF_UNIX98;
250 pt->pt_uminor = unit;
251 pt->devs->si_drv1 = pt->devc->si_drv1 = pt;
252 pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty;
254 ttyregister(&pt->pt_tty);
261 * pti_hold() prevents the pti from being destroyed due to a termination
262 * while a pt*open() is blocked.
264 * This function returns non-zero if we cannot hold due to a termination
267 * NOTE: Must be called with tty_token held
270 pti_hold(struct pt_ioctl *pti)
272 if (pti->pt_flags2 & PF_TERMINATED)
279 * pti_done() releases the reference and checks to see if both sides have
280 * been closed on a unix98 pty, allowing us to destroy the device and
283 * We do not release resources on non-unix98 ptys. Those are left
284 * statically allocated.
287 pti_done(struct pt_ioctl *pti)
289 lwkt_gettoken(&tty_token);
290 if (--pti->pt_refs == 0) {
296 * Only unix09 ptys are freed up
298 if ((pti->pt_flags2 & PF_UNIX98) == 0) {
299 lwkt_reltoken(&tty_token);
304 * Interlock open attempts against termination by setting
305 * PF_TERMINATED. This allows us to block while cleaning
306 * out the device infrastructure.
308 * Do not terminate the tty if it still has a session
309 * association (t_refs).
311 if ((pti->pt_flags2 & (PF_SOPEN|PF_MOPEN)) == 0 &&
312 pti->pt_tty.t_refs == 0) {
313 pti->pt_flags2 |= PF_TERMINATED;
314 uminor_no = pti->pt_uminor;
316 if ((dev = pti->devs) != NULL) {
321 if ((dev = pti->devc) != NULL) {
326 ttyunregister(&pti->pt_tty);
327 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty),
333 lwkt_reltoken(&tty_token);
338 ptsopen(struct dev_open_args *ap)
340 cdev_t dev = ap->a_head.a_dev;
343 struct pt_ioctl *pti;
346 * The pti will already be assigned by the clone code or
347 * pre-created if a non-unix 98 pty. If si_drv1 is NULL
348 * we are somehow racing a unix98 termination.
350 if (dev->si_drv1 == NULL)
354 lwkt_gettoken(&tty_token);
356 lwkt_reltoken(&tty_token);
363 * Reinit most of the tty state if it isn't open. Handle
366 if ((tp->t_state & TS_ISOPEN) == 0) {
367 ttychars(tp); /* Set up default chars */
368 tp->t_iflag = TTYDEF_IFLAG;
369 tp->t_oflag = TTYDEF_OFLAG;
370 tp->t_lflag = TTYDEF_LFLAG;
371 tp->t_cflag = TTYDEF_CFLAG;
372 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
373 } else if ((tp->t_state & TS_XCLUDE) &&
374 priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) {
376 lwkt_reltoken(&tty_token);
378 } else if (pti->pt_prison != ap->a_cred->cr_prison) {
380 lwkt_reltoken(&tty_token);
385 * If the ptc is already present this will connect us up. It
386 * is unclear if this is actually needed.
388 * If neither side is open be sure to clear any left over
389 * ZOMBIE state before continuing.
392 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
393 else if ((pti->pt_flags2 & PF_SOPEN) == 0)
394 tp->t_state &= ~TS_ZOMBIE;
397 * Wait for the carrier (ptc side)
399 while ((tp->t_state & TS_CARR_ON) == 0) {
400 if (ap->a_oflags & FNONBLOCK)
402 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0);
405 lwkt_reltoken(&tty_token);
411 * Mark the tty open and mark the slave side as being open.
413 error = (*linesw[tp->t_line].l_open)(dev, tp);
416 pti->pt_flags2 |= PF_SOPEN;
417 ptcwakeup(tp, FREAD|FWRITE);
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");
438 * Disconnect the slave side
441 err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
442 ptsstop(tp, FREAD|FWRITE);
443 ttyclose(tp); /* clears t_state */
446 * Mark the pty side closed.
448 * If the ptc is still open mark the tty zombie and wakeup the
451 pti->pt_flags2 &= ~PF_SOPEN;
453 tp->t_state |= TS_ZOMBIE;
454 ptcwakeup(tp, FREAD);
457 lwkt_reltoken(&tty_token);
462 ptsread(struct dev_read_args *ap)
464 cdev_t dev = ap->a_head.a_dev;
465 struct proc *p = curproc;
466 struct tty *tp = dev->si_tty;
467 struct pt_ioctl *pti = dev->si_drv1;
472 lp = curthread->td_lwp;
474 lwkt_gettoken(&tty_token);
476 if (pti->pt_flags & PF_REMOTE) {
477 while (isbackground(p, tp)) {
478 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
479 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
480 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) {
481 lwkt_reltoken(&tty_token);
484 pgsignal(p->p_pgrp, SIGTTIN, 1);
485 error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0);
487 lwkt_reltoken(&tty_token);
491 if (tp->t_canq.c_cc == 0) {
492 if (ap->a_ioflag & IO_NDELAY) {
493 lwkt_reltoken(&tty_token);
494 return (EWOULDBLOCK);
496 error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH,
499 lwkt_reltoken(&tty_token);
504 while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0)
505 if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) {
509 if (tp->t_canq.c_cc == 1)
510 clist_getc(&tp->t_canq);
511 if (tp->t_canq.c_cc) {
512 lwkt_reltoken(&tty_token);
517 error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
518 ptcwakeup(tp, FWRITE);
519 lwkt_reltoken(&tty_token);
524 * Write to pseudo-tty.
525 * Wakeups of controlling tty will happen
526 * indirectly, when tty driver calls ptsstart.
529 ptswrite(struct dev_write_args *ap)
531 cdev_t dev = ap->a_head.a_dev;
535 lwkt_gettoken(&tty_token);
537 if (tp->t_oproc == 0) {
538 lwkt_reltoken(&tty_token);
541 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
542 lwkt_reltoken(&tty_token);
547 * Start output on pseudo-tty.
548 * Wake up process selecting or sleeping for input from controlling tty.
551 ptsstart(struct tty *tp)
553 lwkt_gettoken(&tty_token);
554 struct pt_ioctl *pti = tp->t_dev->si_drv1;
556 if (tp->t_state & TS_TTSTOP) {
557 lwkt_reltoken(&tty_token);
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);
622 * If the slave side is not yet open clear any left over zombie
623 * state before doing our modem control.
625 if ((pti->pt_flags2 & PF_SOPEN) == 0)
626 tp->t_state &= ~TS_ZOMBIE;
628 tp->t_oproc = ptsstart;
629 tp->t_stop = ptsstop;
634 (void)(*linesw[tp->t_line].l_modem)(tp, 1);
636 tp->t_lflag &= ~EXTPROC;
637 pti->pt_prison = ap->a_cred->cr_prison;
642 pti->devs->si_uid = ap->a_cred->cr_uid;
643 pti->devs->si_gid = 0;
644 pti->devs->si_perms = 0600;
645 pti->devc->si_uid = ap->a_cred->cr_uid;
646 pti->devc->si_gid = 0;
647 pti->devc->si_perms = 0600;
650 * Mark master side open. This does not cause any events
653 pti->pt_flags2 |= PF_MOPEN;
656 lwkt_reltoken(&tty_token);
661 ptcclose(struct dev_close_args *ap)
663 cdev_t dev = ap->a_head.a_dev;
665 struct pt_ioctl *pti = dev->si_drv1;
667 lwkt_gettoken(&tty_token);
669 panic("ptcclose on terminated pti");
672 (void)(*linesw[tp->t_line].l_modem)(tp, 0);
675 * Mark the master side closed. If the slave is still open
676 * mark the tty ZOMBIE, preventing any new action until both
679 * NOTE: The ttyflush() will wake up the slave once we've
680 * set appropriate flags. The ZOMBIE flag will be
681 * cleared when the slave side is closed.
683 pti->pt_flags2 &= ~PF_MOPEN;
684 if (pti->pt_flags2 & PF_SOPEN) {
685 tp->t_state |= TS_ZOMBIE;
689 * Turn off the carrier and disconnect. This will notify the slave
692 if (tp->t_state & TS_ISOPEN) {
693 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
694 ttyflush(tp, FREAD | FWRITE);
696 tp->t_oproc = NULL; /* mark closed */
698 pti->pt_prison = NULL;
699 pti->devs->si_uid = 0;
700 pti->devs->si_gid = 0;
701 pti->devs->si_perms = 0666;
702 pti->devc->si_uid = 0;
703 pti->devc->si_gid = 0;
704 pti->devc->si_perms = 0666;
708 lwkt_reltoken(&tty_token);
713 ptcread(struct dev_read_args *ap)
715 cdev_t dev = ap->a_head.a_dev;
716 struct tty *tp = dev->si_tty;
717 struct pt_ioctl *pti = dev->si_drv1;
721 lwkt_gettoken(&tty_token);
723 * We want to block until the slave
724 * is open, and there's something to read;
725 * but if we lost the slave or we're NBIO,
726 * then return the appropriate error instead.
729 if (tp->t_state&TS_ISOPEN) {
730 if (pti->pt_flags&PF_PKT && pti->pt_send) {
731 error = ureadc((int)pti->pt_send, ap->a_uio);
733 lwkt_reltoken(&tty_token);
736 if (pti->pt_send & TIOCPKT_IOCTL) {
737 cc = (int)szmin(ap->a_uio->uio_resid,
738 sizeof(tp->t_termios));
739 uiomove((caddr_t)&tp->t_termios, cc,
743 lwkt_reltoken(&tty_token);
746 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
747 error = ureadc((int)pti->pt_ucntl, ap->a_uio);
749 lwkt_reltoken(&tty_token);
753 lwkt_reltoken(&tty_token);
756 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
759 if ((tp->t_state & TS_CONNECTED) == 0) {
760 lwkt_reltoken(&tty_token);
761 return (0); /* EOF */
763 if (ap->a_ioflag & IO_NDELAY) {
764 lwkt_reltoken(&tty_token);
765 return (EWOULDBLOCK);
767 error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0);
769 lwkt_reltoken(&tty_token);
773 if (pti->pt_flags & (PF_PKT|PF_UCNTL))
774 error = ureadc(0, ap->a_uio);
775 while (ap->a_uio->uio_resid > 0 && error == 0) {
776 cc = q_to_b(&tp->t_outq, buf,
777 (int)szmin(ap->a_uio->uio_resid, BUFSIZ));
780 error = uiomove(buf, (size_t)cc, ap->a_uio);
783 lwkt_reltoken(&tty_token);
788 ptsstop(struct tty *tp, int flush)
790 struct pt_ioctl *pti = tp->t_dev->si_drv1;
793 lwkt_gettoken(&tty_token);
794 /* note: FLUSHREAD and FLUSHWRITE already ok */
797 flush = TIOCPKT_STOP;
798 pti->pt_flags |= PF_STOPPED;
800 pti->pt_flags &= ~PF_STOPPED;
802 pti->pt_send |= flush;
803 /* change of perspective */
812 lwkt_reltoken(&tty_token);
816 * kqueue ops for pseudo-terminals.
818 static struct filterops ptcread_filtops =
819 { FILTEROP_ISFD, NULL, filt_ptcrdetach, filt_ptcread };
820 static struct filterops ptcwrite_filtops =
821 { FILTEROP_ISFD, NULL, filt_ptcwdetach, filt_ptcwrite };
824 ptckqfilter(struct dev_kqfilter_args *ap)
826 cdev_t dev = ap->a_head.a_dev;
827 struct knote *kn = ap->a_kn;
828 struct tty *tp = dev->si_tty;
831 lwkt_gettoken(&tty_token);
833 switch (kn->kn_filter) {
835 klist = &tp->t_rkq.ki_note;
836 kn->kn_fop = &ptcread_filtops;
839 klist = &tp->t_wkq.ki_note;
840 kn->kn_fop = &ptcwrite_filtops;
843 ap->a_result = EOPNOTSUPP;
844 lwkt_reltoken(&tty_token);
848 kn->kn_hook = (caddr_t)dev;
849 knote_insert(klist, kn);
850 lwkt_reltoken(&tty_token);
855 filt_ptcread (struct knote *kn, long hint)
857 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
858 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
860 lwkt_gettoken(&tty_token);
861 if (tp->t_state & TS_ZOMBIE) {
862 kn->kn_flags |= EV_EOF;
863 lwkt_reltoken(&tty_token);
867 if ((tp->t_state & TS_ISOPEN) &&
868 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
869 ((pti->pt_flags & PF_PKT) && pti->pt_send) ||
870 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
871 kn->kn_data = tp->t_outq.c_cc;
872 lwkt_reltoken(&tty_token);
875 lwkt_reltoken(&tty_token);
881 filt_ptcwrite (struct knote *kn, long hint)
883 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
884 struct pt_ioctl *pti = ((cdev_t)kn->kn_hook)->si_drv1;
886 lwkt_gettoken(&tty_token);
887 if (tp->t_state & TS_ZOMBIE) {
888 kn->kn_flags |= EV_EOF;
889 lwkt_reltoken(&tty_token);
893 if (tp->t_state & TS_ISOPEN &&
894 ((pti->pt_flags & PF_REMOTE) ?
895 (tp->t_canq.c_cc == 0) :
896 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
897 (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) {
898 kn->kn_data = tp->t_canq.c_cc + tp->t_rawq.c_cc;
899 lwkt_reltoken(&tty_token);
902 lwkt_reltoken(&tty_token);
909 filt_ptcrdetach (struct knote *kn)
911 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
913 knote_remove(&tp->t_rkq.ki_note, kn);
917 filt_ptcwdetach (struct knote *kn)
919 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
921 knote_remove(&tp->t_wkq.ki_note, kn);
928 ptcwrite(struct dev_write_args *ap)
930 cdev_t dev = ap->a_head.a_dev;
931 struct tty *tp = dev->si_tty;
934 u_char locbuf[BUFSIZ];
936 struct pt_ioctl *pti = dev->si_drv1;
939 lwkt_gettoken(&tty_token);
941 if ((tp->t_state&TS_ISOPEN) == 0)
943 if (pti->pt_flags & PF_REMOTE) {
946 while ((ap->a_uio->uio_resid > 0 || cc > 0) &&
947 tp->t_canq.c_cc < TTYHOG - 1) {
949 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
950 cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc);
952 error = uiomove(cp, (size_t)cc, ap->a_uio);
954 lwkt_reltoken(&tty_token);
957 /* check again for safety */
958 if ((tp->t_state & TS_ISOPEN) == 0) {
959 /* adjust as usual */
960 ap->a_uio->uio_resid += cc;
961 lwkt_reltoken(&tty_token);
966 cc = b_to_q((char *)cp, cc, &tp->t_canq);
968 * XXX we don't guarantee that the canq size
969 * is >= TTYHOG, so the above b_to_q() may
970 * leave some bytes uncopied. However, space
971 * is guaranteed for the null terminator if
972 * we don't fail here since (TTYHOG - 1) is
973 * not a multiple of CBSIZE.
979 /* adjust for data copied in but not written */
980 ap->a_uio->uio_resid += cc;
981 clist_putc(0, &tp->t_canq);
983 wakeup(TSA_PTS_READ(tp));
984 lwkt_reltoken(&tty_token);
987 while (ap->a_uio->uio_resid > 0 || cc > 0) {
989 cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ);
991 error = uiomove(cp, (size_t)cc, ap->a_uio);
993 lwkt_reltoken(&tty_token);
996 /* check again for safety */
997 if ((tp->t_state & TS_ISOPEN) == 0) {
998 /* adjust for data copied in but not written */
999 ap->a_uio->uio_resid += cc;
1000 lwkt_reltoken(&tty_token);
1005 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
1006 (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) {
1007 wakeup(TSA_HUP_OR_INPUT(tp));
1010 (*linesw[tp->t_line].l_rint)(*cp++, tp);
1016 lwkt_reltoken(&tty_token);
1020 * Come here to wait for slave to open, for space
1021 * in outq, or space in rawq, or an empty canq.
1023 if ((tp->t_state & TS_CONNECTED) == 0) {
1024 /* adjust for data copied in but not written */
1025 ap->a_uio->uio_resid += cc;
1026 lwkt_reltoken(&tty_token);
1029 if (ap->a_ioflag & IO_NDELAY) {
1030 /* adjust for data copied in but not written */
1031 ap->a_uio->uio_resid += cc;
1033 lwkt_reltoken(&tty_token);
1034 return (EWOULDBLOCK);
1036 lwkt_reltoken(&tty_token);
1039 error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0);
1041 /* adjust for data copied in but not written */
1042 ap->a_uio->uio_resid += cc;
1043 lwkt_reltoken(&tty_token);
1051 ptyioctl(struct dev_ioctl_args *ap)
1053 cdev_t dev = ap->a_head.a_dev;
1054 struct tty *tp = dev->si_tty;
1055 struct pt_ioctl *pti = dev->si_drv1;
1056 u_char *cc = tp->t_cc;
1059 lwkt_gettoken(&tty_token);
1060 if (dev_dflags(dev) & D_MASTER) {
1061 switch (ap->a_cmd) {
1065 * We avoid calling ttioctl on the controller since,
1066 * in that case, tp must be the controlling terminal.
1068 *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
1069 lwkt_reltoken(&tty_token);
1073 if (*(int *)ap->a_data) {
1074 if (pti->pt_flags & PF_UCNTL) {
1075 lwkt_reltoken(&tty_token);
1078 pti->pt_flags |= PF_PKT;
1080 pti->pt_flags &= ~PF_PKT;
1081 lwkt_reltoken(&tty_token);
1085 if (*(int *)ap->a_data) {
1086 if (pti->pt_flags & PF_PKT) {
1087 lwkt_reltoken(&tty_token);
1090 pti->pt_flags |= PF_UCNTL;
1092 pti->pt_flags &= ~PF_UCNTL;
1093 lwkt_reltoken(&tty_token);
1097 if (*(int *)ap->a_data)
1098 pti->pt_flags |= PF_REMOTE;
1100 pti->pt_flags &= ~PF_REMOTE;
1101 ttyflush(tp, FREAD|FWRITE);
1102 lwkt_reltoken(&tty_token);
1106 case TIOCISPTMASTER:
1107 if ((pti->pt_flags2 & PF_UNIX98) &&
1108 (pti->devc == dev)) {
1109 lwkt_reltoken(&tty_token);
1112 lwkt_reltoken(&tty_token);
1119 * The rest of the ioctls shouldn't be called until
1120 * the slave is open.
1122 if ((tp->t_state & TS_ISOPEN) == 0) {
1123 lwkt_reltoken(&tty_token);
1127 switch (ap->a_cmd) {
1137 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
1138 * ttywflush(tp) will hang if there are characters in
1141 ndflush(&tp->t_outq, tp->t_outq.c_cc);
1145 if (*(unsigned int *)ap->a_data >= NSIG ||
1146 *(unsigned int *)ap->a_data == 0) {
1147 lwkt_reltoken(&tty_token);
1150 if ((tp->t_lflag&NOFLSH) == 0)
1151 ttyflush(tp, FREAD|FWRITE);
1152 pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1);
1153 if ((*(unsigned int *)ap->a_data == SIGINFO) &&
1154 ((tp->t_lflag&NOKERNINFO) == 0))
1156 lwkt_reltoken(&tty_token);
1160 if (ap->a_cmd == TIOCEXT) {
1162 * When the EXTPROC bit is being toggled, we need
1163 * to send an TIOCPKT_IOCTL if the packet driver
1166 if (*(int *)ap->a_data) {
1167 if (pti->pt_flags & PF_PKT) {
1168 pti->pt_send |= TIOCPKT_IOCTL;
1169 ptcwakeup(tp, FREAD);
1171 tp->t_lflag |= EXTPROC;
1173 if ((tp->t_lflag & EXTPROC) &&
1174 (pti->pt_flags & PF_PKT)) {
1175 pti->pt_send |= TIOCPKT_IOCTL;
1176 ptcwakeup(tp, FREAD);
1178 tp->t_lflag &= ~EXTPROC;
1180 lwkt_reltoken(&tty_token);
1183 error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
1184 ap->a_fflag, ap->a_cred);
1185 if (error == ENOIOCTL)
1186 error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
1187 if (error == ENOIOCTL) {
1188 if (pti->pt_flags & PF_UCNTL &&
1189 (ap->a_cmd & ~0xff) == UIOCCMD(0)) {
1190 if (ap->a_cmd & 0xff) {
1191 pti->pt_ucntl = (u_char)ap->a_cmd;
1192 ptcwakeup(tp, FREAD);
1194 lwkt_reltoken(&tty_token);
1200 * If external processing and packet mode send ioctl packet.
1202 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
1211 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1218 pti->pt_send |= TIOCPKT_IOCTL;
1219 ptcwakeup(tp, FREAD);
1224 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
1225 && CCEQ(cc[VSTART], CTRL('q'));
1226 if (pti->pt_flags & PF_NOSTOP) {
1228 pti->pt_send &= ~TIOCPKT_NOSTOP;
1229 pti->pt_send |= TIOCPKT_DOSTOP;
1230 pti->pt_flags &= ~PF_NOSTOP;
1231 ptcwakeup(tp, FREAD);
1235 pti->pt_send &= ~TIOCPKT_DOSTOP;
1236 pti->pt_send |= TIOCPKT_NOSTOP;
1237 pti->pt_flags |= PF_NOSTOP;
1238 ptcwakeup(tp, FREAD);
1241 lwkt_reltoken(&tty_token);
1246 static void ptc_drvinit (void *unused);
1249 SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level,
1250 0, "Change pty debug level");
1254 ptc_drvinit(void *unused)
1261 * Create the clonable base device.
1263 make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone,
1264 0, 0, 0666, "ptmx");
1267 for (i = 0; i < 256; i++) {
1272 SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)