/* $NetBSD: tty_pty.c,v 1.68 2003/02/05 15:49:03 pk Exp $ */ /* * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 */ /* * Pseudo-teletype Driver * (Actually two drivers, requiring two entries in 'cdevsw') */ #include __KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.68 2003/02/05 15:49:03 pk Exp $"); #include "opt_compat_sunos.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DEFAULT_NPTYS 16 /* default number of initial ptys */ #define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */ /* Macros to clear/set/test flags. */ #define SET(t, f) (t) |= (f) #define CLR(t, f) (t) &= ~((unsigned)(f)) #define ISSET(t, f) ((t) & (f)) #define BUFSIZ 100 /* Chunk size iomoved to/from user */ /* * pts == /dev/tty[pqrs]? * ptc == /dev/pty[pqrs]? */ struct pt_softc { struct tty *pt_tty; int pt_flags; struct selinfo pt_selr, pt_selw; u_char pt_send; u_char pt_ucntl; }; static struct pt_softc **pt_softc = NULL; /* pty array */ static int npty = 0; /* for pstat -t */ static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ static struct simplelock pt_softc_mutex = SIMPLELOCK_INITIALIZER; #define PF_PKT 0x08 /* packet mode */ #define PF_STOPPED 0x10 /* user told stopped */ #define PF_REMOTE 0x20 /* remote and flow controlled input */ #define PF_NOSTOP 0x40 #define PF_UCNTL 0x80 /* user control mode */ void ptyattach __P((int)); void ptcwakeup __P((struct tty *, int)); void ptsstart __P((struct tty *)); int pty_maxptys __P((int, int)); static struct pt_softc **ptyarralloc __P((int)); static int check_pty __P((dev_t)); dev_type_open(ptcopen); dev_type_close(ptcclose); dev_type_read(ptcread); dev_type_write(ptcwrite); dev_type_poll(ptcpoll); dev_type_kqfilter(ptckqfilter); dev_type_open(ptsopen); dev_type_close(ptsclose); dev_type_read(ptsread); dev_type_write(ptswrite); dev_type_stop(ptsstop); dev_type_poll(ptspoll); dev_type_ioctl(ptyioctl); dev_type_tty(ptytty); const struct cdevsw ptc_cdevsw = { ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY }; const struct cdevsw pts_cdevsw = { ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY }; #if defined(pmax) const struct cdevsw ptc_ultrix_cdevsw = { ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY }; const struct cdevsw pts_ultrix_cdevsw = { ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY }; #endif /* defined(pmax) */ /* * Allocate and zero array of nelem elements. */ static struct pt_softc ** ptyarralloc(nelem) int nelem; { struct pt_softc **pt; nelem += 10; pt = malloc(nelem * sizeof(struct pt_softc *), M_DEVBUF, M_WAITOK); memset(pt, '\0', nelem * sizeof(struct pt_softc *)); return pt; } /* * Check if the minor is correct and ensure necessary structures * are properly allocated. */ static int check_pty(dev) dev_t dev; { struct pt_softc *pti; if (minor(dev) >= npty) { struct pt_softc **newpt; int newnpty; /* check if the requested pty can be granted */ if (minor(dev) >= maxptys) { limit_reached: tablefull("pty", "increase kern.maxptys"); return (ENXIO); } /* * Now grab the pty array mutex - we need to ensure * that the pty array is consistent while copying it's * content to newly allocated, larger space; we also * need to be safe against pty_maxptys(). */ simple_lock(&pt_softc_mutex); do { for(newnpty = npty; newnpty <= minor(dev); newnpty *= 2); if (newnpty > maxptys) newnpty = maxptys; simple_unlock(&pt_softc_mutex); newpt = ptyarralloc(newnpty); simple_lock(&pt_softc_mutex); if (maxptys == npty) { simple_unlock(&pt_softc_mutex); goto limit_reached; } } while(newnpty > maxptys); /* * If the pty array was not enlarged while we were waiting * for mutex, copy current contents of pt_softc[] to newly * allocated array and start using the new bigger array. */ if (minor(dev) >= npty) { memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); free(pt_softc, M_DEVBUF); pt_softc = newpt; npty = newnpty; } else { /* was enlarged when waited fot lock, free new space */ free(newpt, M_DEVBUF); } simple_unlock(&pt_softc_mutex); } /* * If the entry is not yet allocated, allocate one. The mutex is * needed so that the state of pt_softc[] array is consistant * in case it has been longened above. */ if (!pt_softc[minor(dev)]) { MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc), M_DEVBUF, M_WAITOK); memset(pti, 0, sizeof(struct pt_softc)); pti->pt_tty = ttymalloc(); simple_lock(&pt_softc_mutex); /* * Check the entry again - it might have been * added while we were waiting for mutex. */ if (!pt_softc[minor(dev)]) { tty_attach(pti->pt_tty); pt_softc[minor(dev)] = pti; } else { ttyfree(pti->pt_tty); FREE(pti, M_DEVBUF); } simple_unlock(&pt_softc_mutex); } return (0); } /* * Set maxpty in thread-safe way. Returns 0 in case of error, otherwise * new value of maxptys. */ int pty_maxptys(newmax, set) int newmax, set; { if (!set) return (maxptys); /* the value cannot be set to value lower than current number of ptys */ if (newmax < npty) return (0); /* can proceed immediatelly if bigger than current maximum */ if (newmax > maxptys) { maxptys = newmax; return (maxptys); } /* * We have to grab the pt_softc lock, so that we would pick correct * value of npty (might be modified in check_pty()). */ simple_lock(&pt_softc_mutex); if (newmax > npty) maxptys = newmax; simple_unlock(&pt_softc_mutex); return (maxptys); } /* * Establish n (or default if n is 1) ptys in the system. */ void ptyattach(n) int n; { /* maybe should allow 0 => none? */ if (n <= 1) n = DEFAULT_NPTYS; pt_softc = ptyarralloc(n); npty = n; } /*ARGSUSED*/ int ptsopen(dev, flag, devtype, p) dev_t dev; int flag, devtype; struct proc *p; { struct pt_softc *pti; struct tty *tp; int error; if ((error = check_pty(dev))) return (error); pti = pt_softc[minor(dev)]; tp = pti->pt_tty; if (!ISSET(tp->t_state, TS_ISOPEN)) { ttychars(tp); /* Set up default chars */ tp->t_iflag = TTYDEF_IFLAG; tp->t_oflag = TTYDEF_OFLAG; tp->t_lflag = TTYDEF_LFLAG; tp->t_cflag = TTYDEF_CFLAG; tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; ttsetwater(tp); /* would be done in xxparam() */ } else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0) return (EBUSY); if (tp->t_oproc) /* Ctrlr still around. */ SET(tp->t_state, TS_CARR_ON); if (!ISSET(flag, O_NONBLOCK)) { TTY_LOCK(tp); while (!ISSET(tp->t_state, TS_CARR_ON)) { tp->t_wopen++; error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, ttopen, 0); tp->t_wopen--; if (error) { TTY_UNLOCK(tp); return (error); } } TTY_UNLOCK(tp); } error = (*tp->t_linesw->l_open)(dev, tp); ptcwakeup(tp, FREAD|FWRITE); return (error); } int ptsclose(dev, flag, mode, p) dev_t dev; int flag, mode; struct proc *p; { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; int error; error = (*tp->t_linesw->l_close)(tp, flag); error |= ttyclose(tp); ptcwakeup(tp, FREAD|FWRITE); return (error); } int ptsread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct proc *p = curproc; struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; int error = 0; int cc; again: if (pti->pt_flags & PF_REMOTE) { while (isbackground(p, tp)) { if (sigismasked(p, SIGTTIN) || p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) return (EIO); pgsignal(p->p_pgrp, SIGTTIN, 1); TTY_LOCK(tp); error = ttysleep(tp, (caddr_t)&lbolt, TTIPRI | PCATCH | PNORELOCK, ttybg, 0); if (error) return (error); } TTY_LOCK(tp); if (tp->t_canq.c_cc == 0) { if (flag & IO_NDELAY) { TTY_UNLOCK(tp); return (EWOULDBLOCK); } error = ttysleep(tp, (caddr_t)&tp->t_canq, TTIPRI | PCATCH | PNORELOCK, ttyin, 0); if (error) return (error); goto again; } while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { TTY_UNLOCK(tp); error = ureadc(getc(&tp->t_canq), uio); TTY_LOCK(tp); /* Re-check terminal state here? */ } if (tp->t_canq.c_cc == 1) (void) getc(&tp->t_canq); cc = tp->t_canq.c_cc; TTY_UNLOCK(tp); if (cc) return (error); } else if (tp->t_oproc) error = (*tp->t_linesw->l_read)(tp, uio, flag); ptcwakeup(tp, FWRITE); return (error); } /* * Write to pseudo-tty. * Wakeups of controlling tty will happen * indirectly, when tty driver calls ptsstart. */ int ptswrite(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; if (tp->t_oproc == 0) return (EIO); return ((*tp->t_linesw->l_write)(tp, uio, flag)); } /* * Poll pseudo-tty. */ int ptspoll(dev, events, p) dev_t dev; int events; struct proc *p; { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; if (tp->t_oproc == 0) return (EIO); return ((*tp->t_linesw->l_poll)(tp, events, p)); } /* * Start output on pseudo-tty. * Wake up process polling or sleeping for input from controlling tty. * Called with tty slock held. */ void ptsstart(tp) struct tty *tp; { struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; if (ISSET(tp->t_state, TS_TTSTOP)) return; if (pti->pt_flags & PF_STOPPED) { pti->pt_flags &= ~PF_STOPPED; pti->pt_send = TIOCPKT_START; } selnotify(&pti->pt_selr, 0); wakeup((caddr_t)&tp->t_outq.c_cf); } /* * Stop output. * Called with tty slock held. */ void ptsstop(tp, flush) struct tty *tp; int flush; { struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; /* note: FLUSHREAD and FLUSHWRITE already ok */ if (flush == 0) { flush = TIOCPKT_STOP; pti->pt_flags |= PF_STOPPED; } else pti->pt_flags &= ~PF_STOPPED; pti->pt_send |= flush; /* change of perspective */ if (flush & FREAD) { selnotify(&pti->pt_selw, 0); wakeup((caddr_t)&tp->t_rawq.c_cf); } if (flush & FWRITE) { selnotify(&pti->pt_selr, 0); wakeup((caddr_t)&tp->t_outq.c_cf); } } void ptcwakeup(tp, flag) struct tty *tp; int flag; { struct pt_softc *pti = pt_softc[minor(tp->t_dev)]; TTY_LOCK(tp); if (flag & FREAD) { selnotify(&pti->pt_selr, 0); wakeup((caddr_t)&tp->t_outq.c_cf); } if (flag & FWRITE) { selnotify(&pti->pt_selw, 0); wakeup((caddr_t)&tp->t_rawq.c_cf); } TTY_UNLOCK(tp); } /*ARGSUSED*/ int ptcopen(dev, flag, devtype, p) dev_t dev; int flag, devtype; struct proc *p; { struct pt_softc *pti; struct tty *tp; int error; if ((error = check_pty(dev))) return (error); pti = pt_softc[minor(dev)]; tp = pti->pt_tty; if (tp->t_oproc) return (EIO); tp->t_oproc = ptsstart; (void)(*tp->t_linesw->l_modem)(tp, 1); CLR(tp->t_lflag, EXTPROC); pti->pt_flags = 0; pti->pt_send = 0; pti->pt_ucntl = 0; return (0); } /*ARGSUSED*/ int ptcclose(dev, flag, devtype, p) dev_t dev; int flag, devtype; struct proc *p; { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; (void)(*tp->t_linesw->l_modem)(tp, 0); CLR(tp->t_state, TS_CARR_ON); tp->t_oproc = 0; /* mark closed */ return (0); } int ptcread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; u_char buf[BUFSIZ]; int error = 0, cc; /* * We want to block until the slave * is open, and there's something to read; * but if we lost the slave or we're NBIO, * then return the appropriate error instead. */ TTY_LOCK(tp); for (;;) { if (ISSET(tp->t_state, TS_ISOPEN)) { if (pti->pt_flags&PF_PKT && pti->pt_send) { TTY_UNLOCK(tp); error = ureadc((int)pti->pt_send, uio); if (error) return (error); /* * Since we don't have the tty locked, there's * a risk of messing up `t_termios'. This is * relevant only if the tty got closed and then * opened again while we were out uiomoving. */ if (pti->pt_send & TIOCPKT_IOCTL) { cc = min(uio->uio_resid, sizeof(tp->t_termios)); uiomove((caddr_t) &tp->t_termios, cc, uio); } pti->pt_send = 0; return (0); } if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { TTY_UNLOCK(tp); error = ureadc((int)pti->pt_ucntl, uio); if (error) return (error); pti->pt_ucntl = 0; return (0); } if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP)) break; } if (!ISSET(tp->t_state, TS_CARR_ON)) { error = 0; /* EOF */ goto out; } if (flag & IO_NDELAY) { error = EWOULDBLOCK; goto out; } error = ltsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH, ttyin, 0, &tp->t_slock); if (error) goto out; } if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { TTY_UNLOCK(tp); error = ureadc(0, uio); TTY_LOCK(tp); if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) error = EIO; } while (uio->uio_resid > 0 && error == 0) { cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); if (cc <= 0) break; TTY_UNLOCK(tp); error = uiomove(buf, cc, uio); TTY_LOCK(tp); if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) error = EIO; } if (tp->t_outq.c_cc <= tp->t_lowat) { if (ISSET(tp->t_state, TS_ASLEEP)) { CLR(tp->t_state, TS_ASLEEP); wakeup((caddr_t)&tp->t_outq); } selnotify(&tp->t_wsel, 0); } out: TTY_UNLOCK(tp); return (error); } int ptcwrite(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; u_char *cp = NULL; int cc = 0; u_char locbuf[BUFSIZ]; int cnt = 0; int error = 0; again: TTY_LOCK(tp); if (!ISSET(tp->t_state, TS_ISOPEN)) goto block; if (pti->pt_flags & PF_REMOTE) { if (tp->t_canq.c_cc) goto block; while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) { if (cc == 0) { cc = min(uio->uio_resid, BUFSIZ); cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); cp = locbuf; TTY_UNLOCK(tp); error = uiomove((caddr_t)cp, cc, uio); if (error) return (error); TTY_LOCK(tp); /* check again for safety */ if (!ISSET(tp->t_state, TS_ISOPEN)) { error = EIO; goto out; } } if (cc) (void) b_to_q(cp, cc, &tp->t_canq); cc = 0; } (void) putc(0, &tp->t_canq); ttwakeup(tp); wakeup((caddr_t)&tp->t_canq); error = 0; goto out; } while (uio->uio_resid > 0) { if (cc == 0) { cc = min(uio->uio_resid, BUFSIZ); cp = locbuf; TTY_UNLOCK(tp); error = uiomove((caddr_t)cp, cc, uio); if (error) return (error); TTY_LOCK(tp); /* check again for safety */ if (!ISSET(tp->t_state, TS_ISOPEN)) { error = EIO; goto out; } } while (cc > 0) { if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && (tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) { wakeup((caddr_t)&tp->t_rawq); goto block; } /* XXX - should change l_rint to be called with lock * see also tty.c:ttyinput_wlock() */ TTY_UNLOCK(tp); (*tp->t_linesw->l_rint)(*cp++, tp); TTY_LOCK(tp); cnt++; cc--; } cc = 0; } error = 0; goto out; block: /* * Come here to wait for slave to open, for space * in outq, or space in rawq. */ if (!ISSET(tp->t_state, TS_CARR_ON)) { error = EIO; goto out; } if (flag & IO_NDELAY) { /* adjust for data copied in but not written */ uio->uio_resid += cc; error = cnt == 0 ? EWOULDBLOCK : 0; goto out; } error = ltsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH | PNORELOCK, ttyout, 0, &tp->t_slock); if (error) { /* adjust for data copied in but not written */ uio->uio_resid += cc; return (error); } goto again; out: TTY_UNLOCK(tp); return (error); } int ptcpoll(dev, events, p) dev_t dev; int events; struct proc *p; { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; int revents = 0; int s = splsoftclock(); if (events & (POLLIN | POLLRDNORM)) if (ISSET(tp->t_state, TS_ISOPEN) && ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || ((pti->pt_flags & PF_PKT) && pti->pt_send) || ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) revents |= events & (POLLIN | POLLRDNORM); if (events & (POLLOUT | POLLWRNORM)) if (ISSET(tp->t_state, TS_ISOPEN) && ((pti->pt_flags & PF_REMOTE) ? (tp->t_canq.c_cc == 0) : ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))) revents |= events & (POLLOUT | POLLWRNORM); if (events & POLLHUP) if (!ISSET(tp->t_state, TS_CARR_ON)) revents |= POLLHUP; if (revents == 0) { if (events & (POLLIN | POLLHUP | POLLRDNORM)) selrecord(p, &pti->pt_selr); if (events & (POLLOUT | POLLWRNORM)) selrecord(p, &pti->pt_selw); } splx(s); return (revents); } static void filt_ptcrdetach(struct knote *kn) { struct pt_softc *pti; int s; pti = kn->kn_hook; s = spltty(); SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); splx(s); } static int filt_ptcread(struct knote *kn, long hint) { struct pt_softc *pti; struct tty *tp; int canread; pti = kn->kn_hook; tp = pti->pt_tty; canread = (ISSET(tp->t_state, TS_ISOPEN) && ((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) || ((pti->pt_flags & PF_PKT) && pti->pt_send) || ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))); if (canread) { /* * c_cc is number of characters after output post-processing; * the amount of data actually read(2) depends on * setting of input flags for the terminal. */ kn->kn_data = tp->t_outq.c_cc; if (((pti->pt_flags & PF_PKT) && pti->pt_send) || ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)) kn->kn_data++; } return (canread); } static void filt_ptcwdetach(struct knote *kn) { struct pt_softc *pti; int s; pti = kn->kn_hook; s = spltty(); SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); splx(s); } static int filt_ptcwrite(struct knote *kn, long hint) { struct pt_softc *pti; struct tty *tp; int canwrite; int nwrite; pti = kn->kn_hook; tp = pti->pt_tty; canwrite = (ISSET(tp->t_state, TS_ISOPEN) && ((pti->pt_flags & PF_REMOTE) ? (tp->t_canq.c_cc == 0) : ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) || (tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON))))); if (canwrite) { if (pti->pt_flags & PF_REMOTE) nwrite = tp->t_canq.c_cn; else { /* this is guaranteed to be > 0 due to above check */ nwrite = tp->t_canq.c_cn - (tp->t_rawq.c_cc + tp->t_canq.c_cc); } kn->kn_data = nwrite; } return (canwrite); } static const struct filterops ptcread_filtops = { 1, NULL, filt_ptcrdetach, filt_ptcread }; static const struct filterops ptcwrite_filtops = { 1, NULL, filt_ptcwdetach, filt_ptcwrite }; int ptckqfilter(dev_t dev, struct knote *kn) { struct pt_softc *pti = pt_softc[minor(dev)]; struct klist *klist; int s; switch (kn->kn_filter) { case EVFILT_READ: klist = &pti->pt_selr.sel_klist; kn->kn_fop = &ptcread_filtops; break; case EVFILT_WRITE: klist = &pti->pt_selw.sel_klist; kn->kn_fop = &ptcwrite_filtops; break; default: return (1); } kn->kn_hook = pti; s = spltty(); SLIST_INSERT_HEAD(klist, kn, kn_selnext); splx(s); return (0); } struct tty * ptytty(dev) dev_t dev; { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; return (tp); } /*ARGSUSED*/ int ptyioctl(dev, cmd, data, flag, p) dev_t dev; u_long cmd; caddr_t data; int flag; struct proc *p; { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; const struct cdevsw *cdev; u_char *cc = tp->t_cc; int stop, error, sig; cdev = cdevsw_lookup(dev); /* * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. * ttywflush(tp) will hang if there are characters in the outq. */ if (cmd == TIOCEXT) { /* * When the EXTPROC bit is being toggled, we need * to send an TIOCPKT_IOCTL if the packet driver * is turned on. */ if (*(int *)data) { if (pti->pt_flags & PF_PKT) { pti->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); } SET(tp->t_lflag, EXTPROC); } else { if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { pti->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); } CLR(tp->t_lflag, EXTPROC); } return(0); } else if (cdev != NULL && cdev->d_open == ptcopen) switch (cmd) { case TIOCGPGRP: /* * We avoid calling ttioctl on the controller since, * in that case, tp must be the controlling terminal. */ *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; return (0); case TIOCPKT: if (*(int *)data) { if (pti->pt_flags & PF_UCNTL) return (EINVAL); pti->pt_flags |= PF_PKT; } else pti->pt_flags &= ~PF_PKT; return (0); case TIOCUCNTL: if (*(int *)data) { if (pti->pt_flags & PF_PKT) return (EINVAL); pti->pt_flags |= PF_UCNTL; } else pti->pt_flags &= ~PF_UCNTL; return (0); case TIOCREMOTE: if (*(int *)data) pti->pt_flags |= PF_REMOTE; else pti->pt_flags &= ~PF_REMOTE; TTY_LOCK(tp); ttyflush(tp, FREAD|FWRITE); TTY_UNLOCK(tp); return (0); #ifdef COMPAT_OLDTTY case TIOCSETP: case TIOCSETN: #endif case TIOCSETD: case TIOCSETA: case TIOCSETAW: case TIOCSETAF: TTY_LOCK(tp); ndflush(&tp->t_outq, tp->t_outq.c_cc); TTY_UNLOCK(tp); break; case TIOCSIG: sig = (int)(long)*(caddr_t *)data; if (sig <= 0 || sig >= NSIG) return (EINVAL); TTY_LOCK(tp); if (!ISSET(tp->t_lflag, NOFLSH)) ttyflush(tp, FREAD|FWRITE); if ((sig == SIGINFO) && (!ISSET(tp->t_lflag, NOKERNINFO))) ttyinfo(tp); TTY_UNLOCK(tp); pgsignal(tp->t_pgrp, sig, 1); return(0); } error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p); if (error == EPASSTHROUGH) error = ttioctl(tp, cmd, data, flag, p); if (error == EPASSTHROUGH) { if (pti->pt_flags & PF_UCNTL && (cmd & ~0xff) == UIOCCMD(0)) { if (cmd & 0xff) { pti->pt_ucntl = (u_char)cmd; ptcwakeup(tp, FREAD); } return (0); } } /* * If external processing and packet mode send ioctl packet. */ if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) { switch(cmd) { case TIOCSETA: case TIOCSETAW: case TIOCSETAF: #ifdef COMPAT_OLDTTY case TIOCSETP: case TIOCSETN: case TIOCSETC: case TIOCSLTC: case TIOCLBIS: case TIOCLBIC: case TIOCLSET: #endif pti->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); default: break; } } stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s')) && CCEQ(cc[VSTART], CTRL('q')); if (pti->pt_flags & PF_NOSTOP) { if (stop) { pti->pt_send &= ~TIOCPKT_NOSTOP; pti->pt_send |= TIOCPKT_DOSTOP; pti->pt_flags &= ~PF_NOSTOP; ptcwakeup(tp, FREAD); } } else { if (!stop) { pti->pt_send &= ~TIOCPKT_DOSTOP; pti->pt_send |= TIOCPKT_NOSTOP; pti->pt_flags |= PF_NOSTOP; ptcwakeup(tp, FREAD); } } return (error); }