729 lines
16 KiB
C
729 lines
16 KiB
C
/* $NetBSD: tty_pty.c,v 1.34 1996/05/29 02:04:36 mrg Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tty_pty.c 8.2 (Berkeley) 9/23/93
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*/
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/*
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* Pseudo-teletype Driver
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* (Actually two drivers, requiring two entries in 'cdevsw')
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*/
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#include "pty.h" /* XXX */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/file.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/signalvar.h>
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#include <sys/uio.h>
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#include <sys/conf.h>
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#if NPTY == 1
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#undef NPTY
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#define NPTY 32 /* crude XXX */
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#endif
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#define BUFSIZ 100 /* Chunk size iomoved to/from user */
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/*
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* pts == /dev/tty[pqrs]?
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* ptc == /dev/pty[pqrs]?
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*/
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struct pt_softc {
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struct tty *pt_tty;
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int pt_flags;
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struct selinfo pt_selr, pt_selw;
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u_char pt_send;
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u_char pt_ucntl;
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} pt_softc[NPTY]; /* XXX */
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int npty = NPTY; /* for pstat -t */
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#define PF_PKT 0x08 /* packet mode */
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#define PF_STOPPED 0x10 /* user told stopped */
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#define PF_REMOTE 0x20 /* remote and flow controlled input */
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#define PF_NOSTOP 0x40
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#define PF_UCNTL 0x80 /* user control mode */
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void ptyattach __P((int));
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void ptcwakeup __P((struct tty *, int));
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struct tty *ptytty __P((dev_t));
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void ptsstart __P((struct tty *));
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/*
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* Establish n (or default if n is 1) ptys in the system.
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*/
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void
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ptyattach(n)
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int n;
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{
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#ifdef notyet
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#define DEFAULT_NPTY 32
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/* maybe should allow 0 => none? */
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if (n <= 1)
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n = DEFAULT_NPTY;
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pt_softc = malloc(n * sizeof(struct pt_softc), M_DEVBUF, M_WAITOK);
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npty = n;
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#endif
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}
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/*ARGSUSED*/
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int
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ptsopen(dev, flag, devtype, p)
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dev_t dev;
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int flag, devtype;
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struct proc *p;
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{
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struct pt_softc *pti;
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register struct tty *tp;
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int error;
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if (minor(dev) >= npty)
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return (ENXIO);
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pti = &pt_softc[minor(dev)];
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if (!pti->pt_tty) {
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tp = pti->pt_tty = ttymalloc();
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tty_attach(tp);
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}
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else
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tp = pti->pt_tty;
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if ((tp->t_state & TS_ISOPEN) == 0) {
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tp->t_state |= TS_WOPEN;
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ttychars(tp); /* Set up default chars */
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tp->t_iflag = TTYDEF_IFLAG;
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tp->t_oflag = TTYDEF_OFLAG;
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tp->t_lflag = TTYDEF_LFLAG;
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tp->t_cflag = TTYDEF_CFLAG;
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tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
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ttsetwater(tp); /* would be done in xxparam() */
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} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
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return (EBUSY);
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if (tp->t_oproc) /* Ctrlr still around. */
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tp->t_state |= TS_CARR_ON;
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while ((tp->t_state & TS_CARR_ON) == 0) {
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tp->t_state |= TS_WOPEN;
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if (flag&FNONBLOCK)
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break;
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error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
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ttopen, 0);
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if (error)
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return (error);
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}
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error = (*linesw[tp->t_line].l_open)(dev, tp);
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ptcwakeup(tp, FREAD|FWRITE);
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return (error);
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}
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int
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ptsclose(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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register struct pt_softc *pti = &pt_softc[minor(dev)];
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register struct tty *tp = pti->pt_tty;
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int error;
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error = (*linesw[tp->t_line].l_close)(tp, flag);
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error |= ttyclose(tp);
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ptcwakeup(tp, FREAD|FWRITE);
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return (error);
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}
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int
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ptsread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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struct proc *p = curproc;
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register struct pt_softc *pti = &pt_softc[minor(dev)];
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register struct tty *tp = pti->pt_tty;
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int error = 0;
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again:
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if (pti->pt_flags & PF_REMOTE) {
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while (isbackground(p, tp)) {
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if ((p->p_sigignore & sigmask(SIGTTIN)) ||
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(p->p_sigmask & sigmask(SIGTTIN)) ||
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p->p_pgrp->pg_jobc == 0 ||
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p->p_flag & P_PPWAIT)
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return (EIO);
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pgsignal(p->p_pgrp, SIGTTIN, 1);
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error = ttysleep(tp, (caddr_t)&lbolt,
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TTIPRI | PCATCH, ttybg, 0);
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if (error)
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return (error);
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}
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if (tp->t_canq.c_cc == 0) {
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if (flag & IO_NDELAY)
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return (EWOULDBLOCK);
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error = ttysleep(tp, (caddr_t)&tp->t_canq,
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TTIPRI | PCATCH, ttyin, 0);
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if (error)
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return (error);
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goto again;
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}
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while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
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if (ureadc(getc(&tp->t_canq), uio) < 0) {
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error = EFAULT;
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break;
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}
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if (tp->t_canq.c_cc == 1)
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(void) getc(&tp->t_canq);
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if (tp->t_canq.c_cc)
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return (error);
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} else
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if (tp->t_oproc)
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error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
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ptcwakeup(tp, FWRITE);
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return (error);
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}
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/*
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* Write to pseudo-tty.
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* Wakeups of controlling tty will happen
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* indirectly, when tty driver calls ptsstart.
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*/
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int
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ptswrite(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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register struct pt_softc *pti = &pt_softc[minor(dev)];
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register struct tty *tp = pti->pt_tty;
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if (tp->t_oproc == 0)
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return (EIO);
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return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
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}
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/*
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* Start output on pseudo-tty.
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* Wake up process selecting or sleeping for input from controlling tty.
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*/
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void
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ptsstart(tp)
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struct tty *tp;
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{
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register struct pt_softc *pti = &pt_softc[minor(tp->t_dev)];
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if (tp->t_state & TS_TTSTOP)
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return;
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if (pti->pt_flags & PF_STOPPED) {
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pti->pt_flags &= ~PF_STOPPED;
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pti->pt_send = TIOCPKT_START;
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}
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ptcwakeup(tp, FREAD);
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}
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int
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ptsstop(tp, flush)
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register struct tty *tp;
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int flush;
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{
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struct pt_softc *pti = &pt_softc[minor(tp->t_dev)];
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int flag;
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/* note: FLUSHREAD and FLUSHWRITE already ok */
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if (flush == 0) {
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flush = TIOCPKT_STOP;
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pti->pt_flags |= PF_STOPPED;
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} else
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pti->pt_flags &= ~PF_STOPPED;
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pti->pt_send |= flush;
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/* change of perspective */
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flag = 0;
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if (flush & FREAD)
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flag |= FWRITE;
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if (flush & FWRITE)
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flag |= FREAD;
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ptcwakeup(tp, flag);
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return 0;
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}
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void
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ptcwakeup(tp, flag)
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struct tty *tp;
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int flag;
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{
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struct pt_softc *pti = &pt_softc[minor(tp->t_dev)];
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if (flag & FREAD) {
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selwakeup(&pti->pt_selr);
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wakeup((caddr_t)&tp->t_outq.c_cf);
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}
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if (flag & FWRITE) {
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selwakeup(&pti->pt_selw);
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wakeup((caddr_t)&tp->t_rawq.c_cf);
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}
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}
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int ptcopen __P((dev_t, int, int, struct proc *));
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/*ARGSUSED*/
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int
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ptcopen(dev, flag, devtype, p)
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dev_t dev;
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int flag, devtype;
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struct proc *p;
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{
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struct pt_softc *pti;
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register struct tty *tp;
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if (minor(dev) >= npty)
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return (ENXIO);
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pti = &pt_softc[minor(dev)];
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if (!pti->pt_tty) {
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tp = pti->pt_tty = ttymalloc();
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tty_attach(tp);
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}
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else
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tp = pti->pt_tty;
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if (tp->t_oproc)
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return (EIO);
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tp->t_oproc = ptsstart;
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(void)(*linesw[tp->t_line].l_modem)(tp, 1);
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tp->t_lflag &= ~EXTPROC;
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pti->pt_flags = 0;
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pti->pt_send = 0;
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pti->pt_ucntl = 0;
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return (0);
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}
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/*ARGSUSED*/
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int
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ptcclose(dev, flag, devtype, p)
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dev_t dev;
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int flag, devtype;
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struct proc *p;
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{
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register struct pt_softc *pti = &pt_softc[minor(dev)];
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register struct tty *tp = pti->pt_tty;
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(void)(*linesw[tp->t_line].l_modem)(tp, 0);
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tp->t_state &= ~TS_CARR_ON;
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tp->t_oproc = 0; /* mark closed */
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return (0);
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}
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int
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ptcread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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register struct pt_softc *pti = &pt_softc[minor(dev)];
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register struct tty *tp = pti->pt_tty;
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char buf[BUFSIZ];
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int error = 0, cc;
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/*
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* We want to block until the slave
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* is open, and there's something to read;
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* but if we lost the slave or we're NBIO,
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* then return the appropriate error instead.
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*/
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for (;;) {
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if (tp->t_state&TS_ISOPEN) {
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if (pti->pt_flags&PF_PKT && pti->pt_send) {
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error = ureadc((int)pti->pt_send, uio);
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if (error)
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return (error);
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if (pti->pt_send & TIOCPKT_IOCTL) {
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cc = min(uio->uio_resid,
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sizeof(tp->t_termios));
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uiomove((caddr_t) &tp->t_termios,
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cc, uio);
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}
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pti->pt_send = 0;
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return (0);
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}
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if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
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error = ureadc((int)pti->pt_ucntl, uio);
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if (error)
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return (error);
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pti->pt_ucntl = 0;
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return (0);
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}
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if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
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break;
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}
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if ((tp->t_state&TS_CARR_ON) == 0)
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return (0); /* EOF */
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if (flag & IO_NDELAY)
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return (EWOULDBLOCK);
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error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH,
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ttyin, 0);
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if (error)
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return (error);
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}
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if (pti->pt_flags & (PF_PKT|PF_UCNTL))
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error = ureadc(0, uio);
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while (uio->uio_resid > 0 && error == 0) {
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cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
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if (cc <= 0)
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break;
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error = uiomove(buf, cc, uio);
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}
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if (tp->t_outq.c_cc <= tp->t_lowat) {
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if (tp->t_state&TS_ASLEEP) {
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tp->t_state &= ~TS_ASLEEP;
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wakeup((caddr_t)&tp->t_outq);
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}
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selwakeup(&tp->t_wsel);
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}
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return (error);
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}
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int
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ptcwrite(dev, uio, flag)
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dev_t dev;
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register struct uio *uio;
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int flag;
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{
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register struct pt_softc *pti = &pt_softc[minor(dev)];
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register struct tty *tp = pti->pt_tty;
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register u_char *cp = NULL;
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register int cc = 0;
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u_char locbuf[BUFSIZ];
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int cnt = 0;
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int error = 0;
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again:
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if ((tp->t_state&TS_ISOPEN) == 0)
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goto block;
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if (pti->pt_flags & PF_REMOTE) {
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if (tp->t_canq.c_cc)
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goto block;
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while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) {
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if (cc == 0) {
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cc = min(uio->uio_resid, BUFSIZ);
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cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
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cp = locbuf;
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error = uiomove((caddr_t)cp, cc, uio);
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if (error)
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return (error);
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/* check again for safety */
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if ((tp->t_state&TS_ISOPEN) == 0)
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return (EIO);
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}
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if (cc)
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(void) b_to_q((char *)cp, cc, &tp->t_canq);
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cc = 0;
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}
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(void) putc(0, &tp->t_canq);
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ttwakeup(tp);
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wakeup((caddr_t)&tp->t_canq);
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return (0);
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}
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while (uio->uio_resid > 0) {
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if (cc == 0) {
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cc = min(uio->uio_resid, BUFSIZ);
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cp = locbuf;
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error = uiomove((caddr_t)cp, cc, uio);
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if (error)
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return (error);
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/* check again for safety */
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if ((tp->t_state&TS_ISOPEN) == 0)
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return (EIO);
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}
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while (cc > 0) {
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if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
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(tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) {
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wakeup((caddr_t)&tp->t_rawq);
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goto block;
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}
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(*linesw[tp->t_line].l_rint)(*cp++, tp);
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cnt++;
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cc--;
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}
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cc = 0;
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}
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return (0);
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block:
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/*
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* Come here to wait for slave to open, for space
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* in outq, or space in rawq.
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*/
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if ((tp->t_state&TS_CARR_ON) == 0)
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return (EIO);
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if (flag & IO_NDELAY) {
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/* adjust for data copied in but not written */
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uio->uio_resid += cc;
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if (cnt == 0)
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return (EWOULDBLOCK);
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return (0);
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}
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error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH,
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ttyout, 0);
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if (error) {
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/* adjust for data copied in but not written */
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uio->uio_resid += cc;
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return (error);
|
|
}
|
|
goto again;
|
|
}
|
|
|
|
int
|
|
ptcselect(dev, rw, p)
|
|
dev_t dev;
|
|
int rw;
|
|
struct proc *p;
|
|
{
|
|
register struct pt_softc *pti = &pt_softc[minor(dev)];
|
|
register struct tty *tp = pti->pt_tty;
|
|
int s;
|
|
|
|
if ((tp->t_state&TS_CARR_ON) == 0)
|
|
return (1);
|
|
switch (rw) {
|
|
|
|
case FREAD:
|
|
/*
|
|
* Need to block timeouts (ttrstart).
|
|
*/
|
|
s = spltty();
|
|
if ((tp->t_state&TS_ISOPEN) &&
|
|
tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
|
|
splx(s);
|
|
return (1);
|
|
}
|
|
splx(s);
|
|
/* FALLTHROUGH */
|
|
|
|
case 0: /* exceptional */
|
|
if ((tp->t_state&TS_ISOPEN) &&
|
|
(((pti->pt_flags & PF_PKT) && pti->pt_send) ||
|
|
((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
|
|
return (1);
|
|
selrecord(p, &pti->pt_selr);
|
|
break;
|
|
|
|
|
|
case FWRITE:
|
|
if (tp->t_state&TS_ISOPEN) {
|
|
if (pti->pt_flags & PF_REMOTE) {
|
|
if (tp->t_canq.c_cc == 0)
|
|
return (1);
|
|
} else {
|
|
if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2)
|
|
return (1);
|
|
if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON))
|
|
return (1);
|
|
}
|
|
}
|
|
selrecord(p, &pti->pt_selw);
|
|
break;
|
|
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
struct tty *
|
|
ptytty(dev)
|
|
dev_t dev;
|
|
{
|
|
register struct pt_softc *pti = &pt_softc[minor(dev)];
|
|
register 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;
|
|
{
|
|
register struct pt_softc *pti = &pt_softc[minor(dev)];
|
|
register struct tty *tp = pti->pt_tty;
|
|
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_state & EXTPROC) &&
|
|
(pti->pt_flags & PF_PKT)) {
|
|
pti->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
tp->t_lflag &= ~EXTPROC;
|
|
}
|
|
return(0);
|
|
} else
|
|
if (cdevsw[major(dev)].d_open == ptcopen)
|
|
switch (cmd) {
|
|
|
|
case TIOCGPGRP:
|
|
/*
|
|
* We aviod 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_OLDTTY
|
|
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)
|
|
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 < 0)
|
|
error = ttioctl(tp, cmd, data, flag, p);
|
|
if (error < 0) {
|
|
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_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 = (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);
|
|
}
|