/* $NetBSD: tty_pty.c,v 1.145 2019/02/15 18:57:15 mgorny 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. 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 1.145 2019/02/15 18:57:15 mgorny Exp $"); #include "opt_ptm.h" #define TTY_ALLOW_PRIVATE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ioconf.h" #define DEFAULT_NPTYS 16 /* default number of initial ptys */ #define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */ #define BUFSIZ 100 /* Chunk size iomoved to/from user */ 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 maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */ kmutex_t pt_softc_mutex; int npty = 0; /* for pstat -t */ #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 ptcwakeup(struct tty *, int); void ptsstart(struct tty *); int pty_maxptys(int, int); static struct pt_softc **ptyarralloc(int); 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 = { .d_open = ptcopen, .d_close = ptcclose, .d_read = ptcread, .d_write = ptcwrite, .d_ioctl = ptyioctl, .d_stop = nullstop, .d_tty = ptytty, .d_poll = ptcpoll, .d_mmap = nommap, .d_kqfilter = ptckqfilter, .d_discard = nodiscard, .d_flag = D_TTY }; const struct cdevsw pts_cdevsw = { .d_open = ptsopen, .d_close = ptsclose, .d_read = ptsread, .d_write = ptswrite, .d_ioctl = ptyioctl, .d_stop = ptsstop, .d_tty = ptytty, .d_poll = ptspoll, .d_mmap = nommap, .d_kqfilter = ttykqfilter, .d_discard = nodiscard, .d_flag = D_TTY }; #if defined(pmax) /* * Used by arch/pmax/conf/majors.pmax, which needs a second copy as it * needs to map this stuff to two pairs of majors. */ const struct cdevsw ptc_ultrix_cdevsw = { .d_open = ptcopen, .d_close = ptcclose, .d_read = ptcread, .d_write = ptcwrite, .d_ioctl = ptyioctl, .d_stop = nullstop, .d_tty = ptytty, .d_poll = ptcpoll, .d_mmap = nommap, .d_kqfilter = ptckqfilter, .d_discard = nodiscard, .d_flag = D_TTY }; const struct cdevsw pts_ultrix_cdevsw = { .d_open = ptsopen, .d_close = ptsclose, .d_read = ptsread, .d_write = ptswrite, .d_ioctl = ptyioctl, .d_stop = ptsstop, .d_tty = ptytty, .d_poll = ptspoll, .d_mmap = nommap, .d_kqfilter = ttykqfilter, .d_discard = nodiscard, .d_flag = D_TTY }; #endif /* defined(pmax) */ /* * Check if a pty is free to use. */ int pty_isfree(int minor, int lock) { struct pt_softc *pt = pt_softc[minor]; if (lock) mutex_enter(&pt_softc_mutex); minor = pt == NULL || pt->pt_tty == NULL || pt->pt_tty->t_oproc == NULL; if (lock) mutex_exit(&pt_softc_mutex); return minor; } /* * Allocate and zero array of nelem elements. */ static struct pt_softc ** ptyarralloc(int nelem) { struct pt_softc **pt; nelem += 10; pt = kmem_zalloc(nelem * sizeof(*pt), KM_SLEEP); return pt; } static void ptyarrfree(struct pt_softc **pt, int nelem) { nelem += 10; kmem_free(pt, nelem * sizeof(*pt)); } /* * Check if the minor is correct and ensure necessary structures * are properly allocated. */ int pty_check(int ptn) { struct pt_softc *pti; if (ptn >= npty) { struct pt_softc **newpt, **oldpt; int newnpty; int oldnpty; /* check if the requested pty can be granted */ if (ptn >= maxptys) { limit_reached: tablefull("pty", "increase kern.maxptys"); return ENXIO; } /* Allocate a larger pty array */ for (newnpty = npty; newnpty <= ptn;) newnpty *= 2; if (newnpty > maxptys) newnpty = maxptys; newpt = ptyarralloc(newnpty); /* * Now grab the pty array mutex - we need to ensure * that the pty array is consistent while copying its * content to newly allocated, larger space; we also * need to be safe against pty_maxptys(). */ mutex_enter(&pt_softc_mutex); if (newnpty >= maxptys) { /* limit cut away beneath us... */ if (ptn >= maxptys) { mutex_exit(&pt_softc_mutex); ptyarrfree(newpt, newnpty); goto limit_reached; } 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 (newnpty > npty) { memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *)); oldpt = pt_softc; oldnpty = npty; pt_softc = newpt; npty = newnpty; } else { /* was enlarged when waited for lock, free new space */ oldpt = newpt; oldnpty = newnpty; } mutex_exit(&pt_softc_mutex); ptyarrfree(oldpt, oldnpty); } /* * 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 lengthened above. */ if (!pt_softc[ptn]) { pti = kmem_zalloc(sizeof(*pti), KM_SLEEP); selinit(&pti->pt_selr); selinit(&pti->pt_selw); pti->pt_tty = tty_alloc(); mutex_enter(&pt_softc_mutex); /* * Check the entry again - it might have been * added while we were waiting for mutex. */ if (pt_softc[ptn]) { mutex_exit(&pt_softc_mutex); tty_free(pti->pt_tty); seldestroy(&pti->pt_selr); seldestroy(&pti->pt_selw); kmem_free(pti, sizeof(*pti)); return 0; } tty_attach(pti->pt_tty); pt_softc[ptn] = pti; mutex_exit(&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(int newmax, int set) { if (!set) return maxptys; /* * We have to grab the pt_softc lock, so that we would pick correct * value of npty (might be modified in pty_check()). */ mutex_enter(&pt_softc_mutex); /* * The value cannot be set to value lower than the highest pty * number ever allocated. */ if (newmax >= npty) maxptys = newmax; else newmax = 0; mutex_exit(&pt_softc_mutex); return newmax; } /* * Establish n (or default if n is 1) ptys in the system. */ void ptyattach(int n) { mutex_init(&pt_softc_mutex, MUTEX_DEFAULT, IPL_NONE); /* maybe should allow 0 => none? */ if (n <= 1) n = DEFAULT_NPTYS; pt_softc = ptyarralloc(n); npty = n; #ifndef NO_DEV_PTM ptmattach(1); #endif } /*ARGSUSED*/ int ptsopen(dev_t dev, int flag, int devtype, struct lwp *l) { struct pt_softc *pti; struct tty *tp; int error; int ptn = minor(dev); if ((error = pty_check(ptn)) != 0) return error; mutex_spin_enter(&tty_lock); pti = pt_softc[ptn]; tp = pti->pt_tty; if (!ISSET(tp->t_state, TS_ISOPEN)) { tp->t_dev = dev; 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 (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp) != 0) { mutex_spin_exit(&tty_lock); return EBUSY; } if (tp->t_oproc) /* Ctrlr still around. */ SET(tp->t_state, TS_CARR_ON); if (!ISSET(flag, O_NONBLOCK)) { while (!ISSET(tp->t_state, TS_CARR_ON)) { tp->t_wopen++; error = ttysleep(tp, &tp->t_rawcv, true, 0); tp->t_wopen--; if (error != 0) { mutex_spin_exit(&tty_lock); return error; } } } mutex_spin_exit(&tty_lock); error = (*tp->t_linesw->l_open)(dev, tp); ptcwakeup(tp, FREAD|FWRITE); return error; } int ptsclose(dev_t dev, int flag, int mode, struct lwp *l) { 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_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, c; again: if (pti->pt_flags & PF_REMOTE) { mutex_spin_enter(&tty_lock); while (isbackground(p, tp)) { /* XXXSMP */ if (sigismasked(curlwp, SIGTTIN) || p->p_pgrp->pg_jobc == 0 || p->p_lflag & PL_PPWAIT) { mutex_spin_exit(&tty_lock); return EIO; } ttysig(tp, TTYSIG_PG1, SIGTTIN); error = ttypause(tp, hz); if (error != 0) { mutex_spin_exit(&tty_lock); return error; } } if (tp->t_canq.c_cc == 0) { if (flag & IO_NDELAY) { mutex_spin_exit(&tty_lock); return EWOULDBLOCK; } error = ttysleep(tp, &tp->t_cancv, true, 0); mutex_spin_exit(&tty_lock); if (error != 0) return error; goto again; } while(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) { c = getc(&tp->t_canq); mutex_spin_exit(&tty_lock); error = ureadc(c, uio); mutex_spin_enter(&tty_lock); /* Re-check terminal state here? */ } if (tp->t_canq.c_cc == 1) (void) getc(&tp->t_canq); cc = tp->t_canq.c_cc; mutex_spin_exit(&tty_lock); 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_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 == NULL) return EIO; return (*tp->t_linesw->l_write)(tp, uio, flag); } /* * Poll pseudo-tty. */ int ptspoll(dev_t dev, int events, struct lwp *l) { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; if (tp->t_oproc == NULL) return POLLHUP; return (*tp->t_linesw->l_poll)(tp, events, l); } /* * Start output on pseudo-tty. * Wake up process polling or sleeping for input from controlling tty. */ void ptsstart(struct tty *tp) { struct pt_softc *pti; KASSERT(tp->t_dev != NODEV); pti = pt_softc[minor(tp->t_dev)]; KASSERT(mutex_owned(&tty_lock)); 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, NOTE_SUBMIT); cv_broadcast(&tp->t_outcvf); } /* * Stop output. */ void ptsstop(struct tty *tp, int flush) { struct pt_softc *pti; KASSERT(tp->t_dev != NODEV); pti = pt_softc[minor(tp->t_dev)]; KASSERT(mutex_owned(&tty_lock)); /* note: FLUSHREAD and FLUSHWRITE already ok */ CTASSERT(TIOCPKT_FLUSHREAD == FREAD); CTASSERT(TIOCPKT_FLUSHWRITE == FWRITE); 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, NOTE_SUBMIT); cv_broadcast(&tp->t_rawcvf); } if (flush & FWRITE) { selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); cv_broadcast(&tp->t_outcvf); } } void ptcwakeup(struct tty *tp, int flag) { struct pt_softc *pti; if (tp->t_dev == NODEV) return; /* client side not open yet */ pti = pt_softc[minor(tp->t_dev)]; KASSERT(pti != NULL); mutex_spin_enter(&tty_lock); if (flag & FREAD) { selnotify(&pti->pt_selr, 0, NOTE_SUBMIT); cv_broadcast(&tp->t_outcvf); } if (flag & FWRITE) { selnotify(&pti->pt_selw, 0, NOTE_SUBMIT); cv_broadcast(&tp->t_rawcvf); } mutex_spin_exit(&tty_lock); } /*ARGSUSED*/ int ptcopen(dev_t dev, int flag, int devtype, struct lwp *l) { struct pt_softc *pti; struct tty *tp; int error; int ptn = minor(dev); if ((error = pty_check(ptn)) != 0) return error; pti = pt_softc[ptn]; tp = pti->pt_tty; mutex_spin_enter(&tty_lock); if (tp->t_oproc) { mutex_spin_exit(&tty_lock); return EIO; } tp->t_dev = dev; tp->t_oproc = ptsstart; mutex_spin_exit(&tty_lock); (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_t dev, int flag, int devtype, struct lwp *l) { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; (void)(*tp->t_linesw->l_modem)(tp, 0); mutex_spin_enter(&tty_lock); CLR(tp->t_state, TS_CARR_ON); tp->t_oproc = NULL; /* mark closed */ mutex_spin_exit(&tty_lock); return 0; } int ptcread(dev_t dev, struct uio *uio, int flag) { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; u_char bf[BUFSIZ]; int error = 0, cc; int c; if (uio->uio_resid <= 0) return EINVAL; /* * 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. */ mutex_spin_enter(&tty_lock); for (;;) { if (ISSET(tp->t_state, TS_ISOPEN)) { if (pti->pt_flags & PF_PKT && (c = pti->pt_send)) { pti->pt_send = 0; mutex_spin_exit(&tty_lock); error = ureadc(c, uio); if (error != 0) 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 (c & TIOCPKT_IOCTL) { cc = uimin(uio->uio_resid, sizeof(tp->t_termios)); uiomove((void *) &tp->t_termios, cc, uio); } return 0; } if (pti->pt_flags & PF_UCNTL && (c = pti->pt_ucntl)) { pti->pt_ucntl = 0; mutex_spin_exit(&tty_lock); error = ureadc(c, uio); if (error != 0) return error; 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 = cv_wait_sig(&tp->t_outcvf, &tty_lock); if (error != 0) goto out; } if (pti->pt_flags & (PF_PKT|PF_UCNTL)) { mutex_spin_exit(&tty_lock); error = ureadc(0, uio); mutex_spin_enter(&tty_lock); 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, bf, uimin(uio->uio_resid, BUFSIZ)); if (cc <= 0) break; mutex_spin_exit(&tty_lock); error = uiomove(bf, cc, uio); mutex_spin_enter(&tty_lock); if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN)) error = EIO; } ttypull(tp); out: mutex_spin_exit(&tty_lock); return error; } int ptcwrite(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: mutex_spin_enter(&tty_lock); 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) { if (cc == 0) { cc = uimin(uio->uio_resid, BUFSIZ); cc = uimin(cc, TTYHOG - tp->t_canq.c_cc); cp = locbuf; mutex_spin_exit(&tty_lock); error = uiomove(cp, cc, uio); if (error != 0) return error; mutex_spin_enter(&tty_lock); /* check again for safety */ if (!ISSET(tp->t_state, TS_ISOPEN)) { /* * adjust for data copied in but not * written */ uio->uio_resid += cc; error = EIO; goto out; } } if (cc) { cc = b_to_q(cp, cc, &tp->t_outq); if (cc > 0) goto block; } } (void) putc(0, &tp->t_canq); ttwakeup(tp); cv_broadcast(&tp->t_cancv); error = 0; goto out; } while (uio->uio_resid > 0) { if (cc == 0) { cc = uimin(uio->uio_resid, BUFSIZ); cp = locbuf; mutex_spin_exit(&tty_lock); error = uiomove(cp, cc, uio); if (error != 0) return error; mutex_spin_enter(&tty_lock); /* check again for safety */ if (!ISSET(tp->t_state, TS_ISOPEN)) { /* adjust for data copied in but not written */ uio->uio_resid += cc; error = EIO; goto out; } } while (cc > 0) { int used = tp->t_rawq.c_cc + tp->t_canq.c_cc; int canon = ISSET(tp->t_lflag, ICANON) ? 1 : 0; /* * We need space for 2 characters if canonical * because we might need to print ^C */ if (used >= (TTYHOG - canon) && (tp->t_canq.c_cc > 0 || !canon)) { cv_broadcast(&tp->t_rawcv); goto block; } /* * XXX - should change l_rint to be called with lock * see also tty.c:ttyinput_wlock() */ mutex_spin_exit(&tty_lock); (*tp->t_linesw->l_rint)(*cp++, tp); mutex_spin_enter(&tty_lock); cnt++; cc--; } } 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)) { /* adjust for data copied in but not written */ uio->uio_resid += cc; 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 = cv_wait_sig(&tp->t_rawcvf, &tty_lock); mutex_spin_exit(&tty_lock); if (error != 0) { /* adjust for data copied in but not written */ uio->uio_resid += cc; return error; } goto again; out: mutex_spin_exit(&tty_lock); return error; } int ptcpoll(dev_t dev, int events, struct lwp *l) { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; int revents = 0; mutex_spin_enter(&tty_lock); 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(l, &pti->pt_selr); if (events & (POLLOUT | POLLWRNORM)) selrecord(l, &pti->pt_selw); } mutex_spin_exit(&tty_lock); return revents; } static void filt_ptcrdetach(struct knote *kn) { struct pt_softc *pti; pti = kn->kn_hook; mutex_spin_enter(&tty_lock); SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext); mutex_spin_exit(&tty_lock); } 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; if ((hint & NOTE_SUBMIT) == 0) { mutex_spin_enter(&tty_lock); } 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++; } if (!ISSET(tp->t_state, TS_CARR_ON)) { kn->kn_flags |= EV_EOF; canread = 1; } if ((hint & NOTE_SUBMIT) == 0) { mutex_spin_exit(&tty_lock); } return canread; } static void filt_ptcwdetach(struct knote *kn) { struct pt_softc *pti; pti = kn->kn_hook; mutex_spin_enter(&tty_lock); SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext); mutex_spin_exit(&tty_lock); } 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; if ((hint & NOTE_SUBMIT) == 0) { mutex_spin_enter(&tty_lock); } 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; } if ((hint & NOTE_SUBMIT) == 0) { mutex_spin_exit(&tty_lock); } return canwrite; } static const struct filterops ptcread_filtops = { .f_isfd = 1, .f_attach = NULL, .f_detach = filt_ptcrdetach, .f_event = filt_ptcread, }; static const struct filterops ptcwrite_filtops = { .f_isfd = 1, .f_attach = NULL, .f_detach = filt_ptcwdetach, .f_event = filt_ptcwrite, }; int ptckqfilter(dev_t dev, struct knote *kn) { struct pt_softc *pti = pt_softc[minor(dev)]; struct klist *klist; 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 EINVAL; } kn->kn_hook = pti; mutex_spin_enter(&tty_lock); SLIST_INSERT_HEAD(klist, kn, kn_selnext); mutex_spin_exit(&tty_lock); return 0; } struct tty * ptytty(dev_t dev) { struct pt_softc *pti = pt_softc[minor(dev)]; struct tty *tp = pti->pt_tty; return tp; } /*ARGSUSED*/ int ptyioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) { 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; #ifndef NO_DEV_PTM struct mount *mp; #endif /* * 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); } #ifndef NO_DEV_PTM /* Allow getting the name from either the master or the slave */ if (cmd == TIOCPTSNAME) { if ((error = pty_getmp(l, &mp)) != 0) return error; return pty_fill_ptmget(l, dev, -1, -1, data, mp); } #endif cdev = cdevsw_lookup(dev); if (cdev != NULL && cdev->d_open == ptcopen) switch (cmd) { #ifndef NO_DEV_PTM case TIOCGRANTPT: if ((error = pty_getmp(l, &mp)) != 0) return error; return pty_grant_slave(l, dev, mp); #endif 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; mutex_spin_enter(&tty_lock); ttyflush(tp, FREAD|FWRITE); mutex_spin_exit(&tty_lock); return 0; case TIOCSETP: case TIOCSETN: case TIOCSETD: case TIOCSETA: case TIOCSETAW: case TIOCSETAF: mutex_spin_enter(&tty_lock); ndflush(&tp->t_outq, tp->t_outq.c_cc); mutex_spin_exit(&tty_lock); break; case TIOCSIG: sig = (int)(long)*(void **)data; if (sig <= 0 || sig >= NSIG) return EINVAL; mutex_spin_enter(&tty_lock); if (!ISSET(tp->t_lflag, NOFLSH)) ttyflush(tp, FREAD|FWRITE); tp->t_state |= TS_SIGINFO; ttysig(tp, TTYSIG_PG1, sig); mutex_spin_exit(&tty_lock); return 0; case FIONREAD: mutex_spin_enter(&tty_lock); *(int *)data = tp->t_outq.c_cc; mutex_spin_exit(&tty_lock); return 0; } error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l); if (error == EPASSTHROUGH) error = ttioctl(tp, cmd, data, flag, l); 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: case TIOCSETP: case TIOCSETN: case TIOCSETC: case TIOCSLTC: case TIOCLBIS: case TIOCLBIC: case TIOCLSET: 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; }