/*- * 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. * 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 */ #include __FBSDID("$FreeBSD$"); /* * Pseudo-teletype Driver * (Actually two drivers, requiring two entries in 'cdevsw') */ #include "opt_compat.h" #include "opt_tty.h" #include #include #include #include #include #include #if defined(COMPAT_43TTY) #include #endif #include #include #include #include #include #include #include #include #include #include static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); static void ptsstart(struct tty *tp); static void ptsstop(struct tty *tp, int rw); static void ptcwakeup(struct tty *tp, int flag); static struct cdev *ptyinit(struct cdev *cdev, struct thread *td); static d_open_t ptsopen; static d_close_t ptsclose; static d_read_t ptsread; static d_write_t ptswrite; static d_ioctl_t ptsioctl; static d_open_t ptcopen; static d_close_t ptcclose; static d_read_t ptcread; static d_ioctl_t ptcioctl; static d_write_t ptcwrite; static d_poll_t ptcpoll; static struct cdevsw pts_cdevsw = { .d_version = D_VERSION, .d_open = ptsopen, .d_close = ptsclose, .d_read = ptsread, .d_write = ptswrite, .d_ioctl = ptsioctl, .d_name = "pts", .d_flags = D_TTY | D_NEEDGIANT, }; static struct cdevsw ptc_cdevsw = { .d_version = D_VERSION, .d_open = ptcopen, .d_close = ptcclose, .d_read = ptcread, .d_write = ptcwrite, .d_ioctl = ptcioctl, .d_poll = ptcpoll, .d_name = "ptc", .d_flags = D_TTY | D_NEEDGIANT, }; #define BUFSIZ 100 /* Chunk size iomoved to/from user */ struct ptsc { int pt_flags; struct selinfo pt_selr, pt_selw; u_char pt_send; u_char pt_ucntl; struct tty *pt_tty; struct cdev *devs, *devc; int pt_devs_open, pt_devc_open; struct prison *pt_prison; }; #define PF_PKT 0x08 /* packet mode */ #define PF_STOPPED 0x10 /* user told stopped */ #define PF_NOSTOP 0x40 #define PF_UCNTL 0x80 /* user control mode */ #define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf) #define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl) #define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq) static const char names[] = "pqrsPQRSlmnoLMNO"; /* * This function creates and initializes a pts/ptc pair * * pts == /dev/tty[pqrsPQRSlmnoLMNO][0123456789abcdefghijklmnopqrstuv] * ptc == /dev/pty[pqrsPQRSlmnoLMNO][0123456789abcdefghijklmnopqrstuv] */ static struct cdev * ptyinit(struct cdev *devc, struct thread *td) { struct ptsc *pt; int n; n = minor2unit(minor(devc)); /* We only allow for up to 32 ptys per char in "names". */ if (n >= 32 * (sizeof(names) - 1)) return (NULL); devc->si_flags &= ~SI_CHEAPCLONE; /* * Initially do not create a slave endpoint. */ pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); pt->devc = devc; pt->pt_tty = ttyalloc(); pt->pt_tty->t_sc = pt; devc->si_drv1 = pt; devc->si_tty = pt->pt_tty; return (devc); } static void pty_create_slave(struct ucred *cred, struct ptsc *pt, int n) { KASSERT(n >= 0 && n / 32 < sizeof(names), ("pty_create_slave: n %d ptsc %p", n, pt)); pt->devs = make_dev_cred(&pts_cdevsw, n, cred, UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); pt->devs->si_drv1 = pt; pt->devs->si_tty = pt->pt_tty; pt->pt_tty->t_dev = pt->devs; } static void pty_destroy_slave(struct ptsc *pt) { if (pt->pt_tty->t_refcnt > 1) return; pt->pt_tty->t_dev = NULL; ttyrel(pt->pt_tty); pt->pt_tty = NULL; destroy_dev(pt->devs); pt->devs = NULL; } static void pty_maybe_destroy_slave(struct ptsc *pt) { /* * vfs bugs and complications near revoke() make * it currently impossible to destroy struct cdev */ if (0 && pt->pt_devc_open == 0 && pt->pt_devs_open == 0) pty_destroy_slave(pt); } /*ARGSUSED*/ static int ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td) { struct tty *tp; int error; struct ptsc *pt; if (!dev->si_drv1) return(ENXIO); pt = dev->si_drv1; tp = dev->si_tty; if ((tp->t_state & TS_ISOPEN) == 0) { ttyinitmode(tp, 1, 0); } else if (tp->t_state & TS_XCLUDE && priv_check(td, PRIV_TTY_EXCLUSIVE)) return (EBUSY); else if (pt->pt_prison != td->td_ucred->cr_prison && priv_check(td, PRIV_TTY_PRISON)) return (EBUSY); if (tp->t_oproc) /* Ctrlr still around. */ (void)ttyld_modem(tp, 1); while ((tp->t_state & TS_CARR_ON) == 0) { if (flag&FNONBLOCK) break; error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, "ptsopn", 0); if (error) return (error); } error = ttyld_open(tp, dev); if (error == 0) { ptcwakeup(tp, FREAD|FWRITE); pt->pt_devs_open = 1; } else pty_maybe_destroy_slave(pt); return (error); } static int ptsclose(struct cdev *dev, int flag, int mode, struct thread *td) { struct ptsc *pti; struct tty *tp; int err; tp = dev->si_tty; pti = dev->si_drv1; KASSERT(dev == pti->devs, ("ptsclose: dev != pti->devs")); err = ttyld_close(tp, flag); (void) tty_close(tp); pti->pt_devs_open = 0; pty_maybe_destroy_slave(pti); return (err); } static int ptsread(struct cdev *dev, struct uio *uio, int flag) { struct tty *tp = dev->si_tty; int error = 0; if (tp->t_oproc) error = ttyld_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. */ static int ptswrite(struct cdev *dev, struct uio *uio, int flag) { struct tty *tp; tp = dev->si_tty; if (tp->t_oproc == 0) return (EIO); return (ttyld_write(tp, uio, flag)); } /* * Start output on pseudo-tty. * Wake up process selecting or sleeping for input from controlling tty. */ static void ptsstart(struct tty *tp) { struct ptsc *pt = tp->t_sc; if (tp->t_state & TS_TTSTOP) return; if (pt->pt_flags & PF_STOPPED) { pt->pt_flags &= ~PF_STOPPED; pt->pt_send = TIOCPKT_START; } ptcwakeup(tp, FREAD); } static void ptcwakeup(struct tty *tp, int flag) { struct ptsc *pt = tp->t_sc; if (flag & FREAD) { selwakeuppri(&pt->pt_selr, TTIPRI); wakeup(TSA_PTC_READ(tp)); } if (flag & FWRITE) { selwakeuppri(&pt->pt_selw, TTOPRI); wakeup(TSA_PTC_WRITE(tp)); } } static int ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td) { struct tty *tp; struct ptsc *pt; if (!dev->si_drv1) ptyinit(dev, td); if (!dev->si_drv1) return(ENXIO); pt = dev->si_drv1; /* * In case we have destroyed the struct tty at the last connect time, * we need to recreate it. */ if (pt->pt_tty == NULL) { pt->pt_tty = ttyalloc(); pt->pt_tty->t_sc = pt; dev->si_tty = pt->pt_tty; } tp = dev->si_tty; if (tp->t_oproc) return (EIO); tp->t_timeout = -1; tp->t_oproc = ptsstart; tp->t_stop = ptsstop; (void)ttyld_modem(tp, 1); tp->t_lflag &= ~EXTPROC; pt->pt_prison = td->td_ucred->cr_prison; pt->pt_flags = 0; pt->pt_send = 0; pt->pt_ucntl = 0; if (!pt->devs) pty_create_slave(td->td_ucred, pt, minor2unit(minor(dev))); pt->pt_devc_open = 1; return (0); } static int ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td) { struct ptsc *pti = dev->si_drv1; struct tty *tp; tp = dev->si_tty; (void)ttyld_modem(tp, 0); /* * XXX MDMBUF makes no sense for ptys but would inhibit the above * l_modem(). CLOCAL makes sense but isn't supported. Special * l_modem()s that ignore carrier drop make no sense for ptys but * may be in use because other parts of the line discipline make * sense for ptys. Recover by doing everything that a normal * ttymodem() would have done except for sending a SIGHUP. */ if (tp->t_state & TS_ISOPEN) { tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); tp->t_state |= TS_ZOMBIE; ttyflush(tp, FREAD | FWRITE); } tp->t_oproc = 0; /* mark closed */ pti->pt_devc_open = 0; pty_maybe_destroy_slave(pti); return (0); } static int ptcread(struct cdev *dev, struct uio *uio, int flag) { struct tty *tp = dev->si_tty; struct ptsc *pt = dev->si_drv1; 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. */ for (;;) { if (tp->t_state&TS_ISOPEN) { if (pt->pt_flags&PF_PKT && pt->pt_send) { error = ureadc((int)pt->pt_send, uio); if (error) return (error); if (pt->pt_send & TIOCPKT_IOCTL) { cc = min(uio->uio_resid, sizeof(tp->t_termios)); uiomove(&tp->t_termios, cc, uio); } pt->pt_send = 0; return (0); } if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) { error = ureadc((int)pt->pt_ucntl, uio); if (error) return (error); pt->pt_ucntl = 0; return (0); } if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) break; } if ((tp->t_state & TS_CONNECTED) == 0) return (0); /* EOF */ if (flag & O_NONBLOCK) return (EWOULDBLOCK); error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); if (error) return (error); } if (pt->pt_flags & (PF_PKT|PF_UCNTL)) error = ureadc(0, uio); while (uio->uio_resid > 0 && error == 0) { cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); if (cc <= 0) break; error = uiomove(buf, cc, uio); } ttwwakeup(tp); return (error); } static void ptsstop(struct tty *tp, int flush) { struct ptsc *pt = tp->t_sc; int flag; /* note: FLUSHREAD and FLUSHWRITE already ok */ if (flush == 0) { flush = TIOCPKT_STOP; pt->pt_flags |= PF_STOPPED; } else pt->pt_flags &= ~PF_STOPPED; pt->pt_send |= flush; /* change of perspective */ flag = 0; if (flush & FREAD) flag |= FWRITE; if (flush & FWRITE) flag |= FREAD; ptcwakeup(tp, flag); } static int ptcpoll(struct cdev *dev, int events, struct thread *td) { struct tty *tp = dev->si_tty; struct ptsc *pt = dev->si_drv1; int revents = 0; int s; if ((tp->t_state & TS_CONNECTED) == 0) return (events & (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)); /* * Need to block timeouts (ttrstart). */ s = spltty(); if (events & (POLLIN | POLLRDNORM)) if ((tp->t_state & TS_ISOPEN) && ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || ((pt->pt_flags & PF_PKT) && pt->pt_send) || ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl))) revents |= events & (POLLIN | POLLRDNORM); if (events & (POLLOUT | POLLWRNORM)) if (tp->t_state & TS_ISOPEN && (((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) revents |= events & (POLLOUT | POLLWRNORM); if (events & POLLHUP) if ((tp->t_state & TS_CARR_ON) == 0) revents |= POLLHUP; if (revents == 0) { if (events & (POLLIN | POLLRDNORM)) selrecord(td, &pt->pt_selr); if (events & (POLLOUT | POLLWRNORM)) selrecord(td, &pt->pt_selw); } splx(s); return (revents); } static int ptcwrite(struct cdev *dev, struct uio *uio, int flag) { struct tty *tp = dev->si_tty; u_char *cp = 0; int cc = 0; u_char locbuf[BUFSIZ]; int cnt = 0; int error = 0; again: if ((tp->t_state&TS_ISOPEN) == 0) goto block; while (uio->uio_resid > 0 || cc > 0) { if (cc == 0) { cc = min(uio->uio_resid, BUFSIZ); cp = locbuf; error = uiomove(cp, cc, uio); if (error) return (error); /* check again for safety */ if ((tp->t_state & TS_ISOPEN) == 0) { /* adjust for data copied in but not written */ uio->uio_resid += cc; return (EIO); } } while (cc > 0) { if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { wakeup(TSA_HUP_OR_INPUT(tp)); goto block; } ttyld_rint(tp, *cp++); cnt++; cc--; } cc = 0; } return (0); block: /* * Come here to wait for slave to open, for space * in outq, or space in rawq, or an empty canq. */ if ((tp->t_state & TS_CONNECTED) == 0) { /* adjust for data copied in but not written */ uio->uio_resid += cc; return (EIO); } if (flag & O_NONBLOCK) { /* adjust for data copied in but not written */ uio->uio_resid += cc; if (cnt == 0) return (EWOULDBLOCK); return (0); } error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); if (error) { /* adjust for data copied in but not written */ uio->uio_resid += cc; return (error); } goto again; } /*ARGSUSED*/ static int ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) { struct tty *tp = dev->si_tty; struct ptsc *pt = dev->si_drv1; #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ defined(COMPAT_FREEBSD4) || defined(COMPAT_43) int ival; #endif 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 (pt->pt_flags & PF_UCNTL) return (EINVAL); pt->pt_flags |= PF_PKT; } else pt->pt_flags &= ~PF_PKT; return (0); case TIOCUCNTL: if (*(int *)data) { if (pt->pt_flags & PF_PKT) return (EINVAL); pt->pt_flags |= PF_UCNTL; } else pt->pt_flags &= ~PF_UCNTL; return (0); } /* * The rest of the ioctls shouldn't be called until * the slave is open. */ if ((tp->t_state & TS_ISOPEN) == 0) return (EAGAIN); switch (cmd) { #ifdef COMPAT_43TTY case TIOCSETP: case TIOCSETN: #endif case TIOCSETD: case TIOCSETA: case TIOCSETAW: case TIOCSETAF: /* * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. * ttywflush(tp) will hang if there are characters in * the outq. */ ndflush(&tp->t_outq, tp->t_outq.c_cc); break; #if defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD5) || \ defined(COMPAT_FREEBSD4) || defined(COMPAT_43) case _IO('t', 95): ival = IOCPARM_IVAL(data); data = (caddr_t)&ival; /* FALLTHROUGH */ #endif case TIOCSIG: if (*(unsigned int *)data >= NSIG || *(unsigned int *)data == 0) return(EINVAL); if ((tp->t_lflag&NOFLSH) == 0) ttyflush(tp, FREAD|FWRITE); if (tp->t_pgrp != NULL) { PGRP_LOCK(tp->t_pgrp); pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); PGRP_UNLOCK(tp->t_pgrp); } if ((*(unsigned int *)data == SIGINFO) && ((tp->t_lflag&NOKERNINFO) == 0)) ttyinfo(tp); return(0); } return (ptsioctl(dev, cmd, data, flag, td)); } /*ARGSUSED*/ static int ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) { struct tty *tp = dev->si_tty; struct ptsc *pt = dev->si_drv1; u_char *cc = tp->t_cc; int stop, error; 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 (pt->pt_flags & PF_PKT) { pt->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); } tp->t_lflag |= EXTPROC; } else { if ((tp->t_lflag & EXTPROC) && (pt->pt_flags & PF_PKT)) { pt->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); } tp->t_lflag &= ~EXTPROC; } return(0); } error = ttyioctl(dev, cmd, data, flag, td); if (error == ENOTTY) { if (pt->pt_flags & PF_UCNTL && (cmd & ~0xff) == UIOCCMD(0)) { if (cmd & 0xff) { pt->pt_ucntl = (u_char)cmd; ptcwakeup(tp, FREAD); } return (0); } error = ENOTTY; } /* * If external processing and packet mode send ioctl packet. */ if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) { switch(cmd) { case TIOCSETA: case TIOCSETAW: case TIOCSETAF: #ifdef COMPAT_43TTY case TIOCSETP: case TIOCSETN: case TIOCSETC: case TIOCSLTC: case TIOCLBIS: case TIOCLBIC: case TIOCLSET: #endif pt->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); break; default: break; } } stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) && CCEQ(cc[VSTART], CTRL('q')); if (pt->pt_flags & PF_NOSTOP) { if (stop) { pt->pt_send &= ~TIOCPKT_NOSTOP; pt->pt_send |= TIOCPKT_DOSTOP; pt->pt_flags &= ~PF_NOSTOP; ptcwakeup(tp, FREAD); } } else { if (!stop) { pt->pt_send &= ~TIOCPKT_DOSTOP; pt->pt_send |= TIOCPKT_NOSTOP; pt->pt_flags |= PF_NOSTOP; ptcwakeup(tp, FREAD); } } return (error); } static void pty_clone(void *arg, struct ucred *cr, char *name, int namelen, struct cdev **dev) { char *cp; int u; if (*dev != NULL) return; if (bcmp(name, "pty", 3) != 0) return; if (name[5] != '\0' || name[3] == '\0') return; cp = index(names, name[3]); if (cp == NULL) return; u = (cp - names) * 32; if (name[4] >= '0' && name[4] <= '9') u += name[4] - '0'; else if (name[4] >= 'a' && name[4] <= 'v') u += name[4] - 'a' + 10; else return; *dev = make_dev_credf(MAKEDEV_REF, &ptc_cdevsw, unit2minor(u), cr, UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); (*dev)->si_flags |= SI_CHEAPCLONE; return; } static void ptc_drvinit(void *unused) { EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); } SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ptc_drvinit,NULL)