/* * 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 * $Id: tty_pty.c,v 1.56 1999/04/27 11:16:19 phk Exp $ */ /* * Pseudo-teletype Driver * (Actually two drivers, requiring two entries in 'cdevsw') */ #include "pty.h" /* XXX */ #include "opt_compat.h" #include "opt_devfs.h" #include #include #if defined(COMPAT_43) || defined(COMPAT_SUNOS) #include #endif #include #include #include #include #include #include #include #include #ifdef DEVFS #include #endif /*DEVFS*/ #ifdef notyet static void ptyattach __P((int n)); #endif static void ptsstart __P((struct tty *tp)); static void ptcwakeup __P((struct tty *tp, int flag)); static d_open_t ptsopen; static d_close_t ptsclose; static d_read_t ptsread; static d_write_t ptswrite; static d_ioctl_t ptyioctl; static d_stop_t ptsstop; static d_devtotty_t ptydevtotty; static d_open_t ptcopen; static d_close_t ptcclose; static d_read_t ptcread; static d_write_t ptcwrite; static d_poll_t ptcpoll; #define CDEV_MAJOR_S 5 static struct cdevsw pts_cdevsw = { ptsopen, ptsclose, ptsread, ptswrite, ptyioctl, ptsstop, nullreset, ptydevtotty, ttpoll, nommap, NULL, "pts", NULL, -1, nodump, nopsize, D_TTY, }; #define CDEV_MAJOR_C 6 static struct cdevsw ptc_cdevsw = { ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl, nullstop, nullreset, ptydevtotty, ptcpoll, nommap, NULL, "ptc", NULL, -1, nodump, nopsize, D_TTY, }; #if NPTY == 1 #undef NPTY #define NPTY 32 /* crude XXX */ #warning You have only one pty defined, redefining to 32. #endif #ifdef DEVFS #define MAXUNITS (8 * 32) static void *devfs_token_pts[MAXUNITS]; static void *devfs_token_ptc[MAXUNITS]; static const char jnames[] = "pqrsPQRS"; #if NPTY > MAXUNITS #undef NPTY #define NPTY MAXUNITS #warning Can't have more than 256 pty's with DEVFS defined. #endif #endif #define BUFSIZ 100 /* Chunk size iomoved to/from user */ /* * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] */ static struct tty pt_tty[NPTY]; /* XXX */ static struct pt_ioctl { int pt_flags; struct selinfo pt_selr, pt_selw; u_char pt_send; u_char pt_ucntl; } pt_ioctl[NPTY]; /* XXX */ static int npty = NPTY; /* 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 */ #ifdef notyet /* * Establish n (or default if n is 1) ptys in the system. * * XXX cdevsw & pstat require the array `pty[]' to be an array */ static void ptyattach(n) int n; { char *mem; register u_long ntb; #define DEFAULT_NPTY 32 /* maybe should allow 0 => none? */ if (n <= 1) n = DEFAULT_NPTY; ntb = n * sizeof(struct tty); mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl), M_DEVBUF, M_WAITOK); pt_tty = (struct tty *)mem; mem = (char *)ALIGN(mem + ntb); pt_ioctl = (struct pt_ioctl *)mem; npty = n; } #endif /*ARGSUSED*/ static int ptsopen(dev, flag, devtype, p) dev_t dev; int flag, devtype; struct proc *p; { register struct tty *tp; int error; if (minor(dev) >= npty) return (ENXIO); tp = &pt_tty[minor(dev)]; if ((tp->t_state & TS_ISOPEN) == 0) { 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; } else if (tp->t_state & TS_XCLUDE && suser(p)) return (EBUSY); if (tp->t_oproc) /* Ctrlr still around. */ (void)(*linesw[tp->t_line].l_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 = (*linesw[tp->t_line].l_open)(dev, tp); if (error == 0) ptcwakeup(tp, FREAD|FWRITE); return (error); } static int ptsclose(dev, flag, mode, p) dev_t dev; int flag, mode; struct proc *p; { register struct tty *tp; int err; tp = &pt_tty[minor(dev)]; err = (*linesw[tp->t_line].l_close)(tp, flag); ptsstop(tp, FREAD|FWRITE); (void) ttyclose(tp); return (err); } static int ptsread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct proc *p = curproc; register struct tty *tp = &pt_tty[minor(dev)]; register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; int error = 0; again: if (pti->pt_flags & PF_REMOTE) { while (isbackground(p, tp)) { if ((p->p_sigignore & sigmask(SIGTTIN)) || (p->p_sigmask & sigmask(SIGTTIN)) || p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) return (EIO); pgsignal(p->p_pgrp, SIGTTIN, 1); error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 0); if (error) return (error); } if (tp->t_canq.c_cc == 0) { if (flag & IO_NDELAY) return (EWOULDBLOCK); error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, "ptsin", 0); if (error) return (error); goto again; } while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) if (ureadc(getc(&tp->t_canq), uio) < 0) { error = EFAULT; break; } if (tp->t_canq.c_cc == 1) (void) getc(&tp->t_canq); if (tp->t_canq.c_cc) return (error); } else if (tp->t_oproc) error = (*linesw[tp->t_line].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. */ static int ptswrite(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { register struct tty *tp; tp = &pt_tty[minor(dev)]; if (tp->t_oproc == 0) return (EIO); return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); } /* * Start output on pseudo-tty. * Wake up process selecting or sleeping for input from controlling tty. */ static void ptsstart(tp) struct tty *tp; { register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; if (tp->t_state & TS_TTSTOP) return; if (pti->pt_flags & PF_STOPPED) { pti->pt_flags &= ~PF_STOPPED; pti->pt_send = TIOCPKT_START; } ptcwakeup(tp, FREAD); } static void ptcwakeup(tp, flag) struct tty *tp; int flag; { struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; if (flag & FREAD) { selwakeup(&pti->pt_selr); wakeup(TSA_PTC_READ(tp)); } if (flag & FWRITE) { selwakeup(&pti->pt_selw); wakeup(TSA_PTC_WRITE(tp)); } } static int ptcopen(dev, flag, devtype, p) dev_t dev; int flag, devtype; struct proc *p; { register struct tty *tp; struct pt_ioctl *pti; if (minor(dev) >= npty) return (ENXIO); tp = &pt_tty[minor(dev)]; if (tp->t_oproc) return (EIO); tp->t_oproc = ptsstart; #ifdef sun4c tp->t_stop = ptsstop; #endif (void)(*linesw[tp->t_line].l_modem)(tp, 1); tp->t_lflag &= ~EXTPROC; pti = &pt_ioctl[minor(dev)]; pti->pt_flags = 0; pti->pt_send = 0; pti->pt_ucntl = 0; return (0); } static int ptcclose(dev, flags, fmt, p) dev_t dev; int flags; int fmt; struct proc *p; { register struct tty *tp; tp = &pt_tty[minor(dev)]; (void)(*linesw[tp->t_line].l_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 */ return (0); } static int ptcread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { register struct tty *tp = &pt_tty[minor(dev)]; struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 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 (pti->pt_flags&PF_PKT && pti->pt_send) { error = ureadc((int)pti->pt_send, uio); if (error) return (error); 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) { error = ureadc((int)pti->pt_ucntl, uio); if (error) return (error); pti->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 & IO_NDELAY) return (EWOULDBLOCK); error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); if (error) return (error); } if (pti->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(tp, flush) register struct tty *tp; int flush; { struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; int flag; /* 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 */ flag = 0; if (flush & FREAD) flag |= FWRITE; if (flush & FWRITE) flag |= FREAD; ptcwakeup(tp, flag); } static int ptcpoll(dev, events, p) dev_t dev; int events; struct proc *p; { register struct tty *tp = &pt_tty[minor(dev)]; struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; int revents = 0; int s; if ((tp->t_state & TS_CONNECTED) == 0) return (seltrue(dev, events, p) | POLLHUP); /* * 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) || ((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 (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 && (tp->t_iflag & 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(p, &pti->pt_selr); if (events & (POLLOUT | POLLWRNORM)) selrecord(p, &pti->pt_selw); } splx(s); return (revents); } static int ptcwrite(dev, uio, flag) dev_t dev; register struct uio *uio; int flag; { register struct tty *tp = &pt_tty[minor(dev)]; register u_char *cp = 0; register int cc = 0; u_char locbuf[BUFSIZ]; int cnt = 0; struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; int error = 0; again: if ((tp->t_state&TS_ISOPEN) == 0) goto block; if (pti->pt_flags & PF_REMOTE) { if (tp->t_canq.c_cc) goto block; while ((uio->uio_resid > 0 || cc > 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; error = uiomove((caddr_t)cp, cc, uio); if (error) return (error); /* check again for safety */ if ((tp->t_state & TS_ISOPEN) == 0) { /* adjust as usual */ uio->uio_resid += cc; return (EIO); } } if (cc > 0) { cc = b_to_q((char *)cp, cc, &tp->t_canq); /* * XXX we don't guarantee that the canq size * is >= TTYHOG, so the above b_to_q() may * leave some bytes uncopied. However, space * is guaranteed for the null terminator if * we don't fail here since (TTYHOG - 1) is * not a multiple of CBSIZE. */ if (cc > 0) break; } } /* adjust for data copied in but not written */ uio->uio_resid += cc; (void) putc(0, &tp->t_canq); ttwakeup(tp); wakeup(TSA_PTS_READ(tp)); return (0); } while (uio->uio_resid > 0 || cc > 0) { if (cc == 0) { cc = min(uio->uio_resid, BUFSIZ); cp = locbuf; error = uiomove((caddr_t)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_iflag&ICANON))) { wakeup(TSA_HUP_OR_INPUT(tp)); goto block; } (*linesw[tp->t_line].l_rint)(*cp++, tp); 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 & IO_NDELAY) { /* 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; } static struct tty * ptydevtotty(dev) dev_t dev; { if (minor(dev) >= npty) return (NULL); return &pt_tty[minor(dev)]; } /*ARGSUSED*/ static int ptyioctl(dev, cmd, data, flag, p) dev_t dev; u_long cmd; caddr_t data; int flag; struct proc *p; { register struct tty *tp = &pt_tty[minor(dev)]; register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; register u_char *cc = tp->t_cc; int stop, error; /* * 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); } tp->t_lflag |= EXTPROC; } else { if ((tp->t_lflag & EXTPROC) && (pti->pt_flags & PF_PKT)) { pti->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); } tp->t_lflag &= ~EXTPROC; } return(0); } else if (devsw(dev)->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; ttyflush(tp, FREAD|FWRITE); return (0); #ifdef COMPAT_43 case TIOCSETP: case TIOCSETN: #endif case TIOCSETD: case TIOCSETA: case TIOCSETAW: case TIOCSETAF: ndflush(&tp->t_outq, tp->t_outq.c_cc); break; case TIOCSIG: if (*(unsigned int *)data >= NSIG || *(unsigned int *)data == 0) return(EINVAL); if ((tp->t_lflag&NOFLSH) == 0) ttyflush(tp, FREAD|FWRITE); pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); if ((*(unsigned int *)data == SIGINFO) && ((tp->t_lflag&NOKERNINFO) == 0)) ttyinfo(tp); return(0); } error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); if (error == ENOIOCTL) error = ttioctl(tp, cmd, data, flag); if (error == ENOIOCTL) { if (pti->pt_flags & PF_UCNTL && (cmd & ~0xff) == UIOCCMD(0)) { if (cmd & 0xff) { pti->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) && (pti->pt_flags & PF_PKT)) { switch(cmd) { case TIOCSETA: case TIOCSETAW: case TIOCSETAF: #ifdef COMPAT_43 case TIOCSETP: case TIOCSETN: #endif #if defined(COMPAT_43) || defined(COMPAT_SUNOS) case TIOCSETC: case TIOCSLTC: case TIOCLBIS: case TIOCLBIC: case TIOCLSET: #endif pti->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); default: break; } } stop = (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); } static int ptc_devsw_installed; static void ptc_drvinit __P((void *unused)); static void ptc_drvinit(unused) void *unused; { #ifdef DEVFS int i,j,k; #endif dev_t dev; if( ! ptc_devsw_installed ) { dev = makedev(CDEV_MAJOR_S, 0); cdevsw_add(&dev, &pts_cdevsw, NULL); dev = makedev(CDEV_MAJOR_C, 0); cdevsw_add(&dev, &ptc_cdevsw, NULL); ptc_devsw_installed = 1; #ifdef DEVFS for ( i = 0 ; i