cfb2dd92f0
Lock setting/clearing of tp->t_oproc to guarantee concurrent opens can't both suceed and that code in tty.c can't get a NULL t_oproc if the value is re-read after being checked. There are still MP issues with pt_flags, pt_send and pt_unctl. Maybe problems that require TTY_LOCK() to be taken before calling std tty functions.
1122 lines
25 KiB
C
1122 lines
25 KiB
C
/* $NetBSD: tty_pty.c,v 1.71 2003/07/23 13:10:28 dsl 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 8.4 (Berkeley) 2/20/95
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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 <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.71 2003/07/23 13:10:28 dsl Exp $");
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#include "opt_compat_sunos.h"
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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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#include <sys/poll.h>
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#include <sys/malloc.h>
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#define DEFAULT_NPTYS 16 /* default number of initial ptys */
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#define DEFAULT_MAXPTYS 992 /* default maximum number of ptys */
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/* Macros to clear/set/test flags. */
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#define SET(t, f) (t) |= (f)
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#define CLR(t, f) (t) &= ~((unsigned)(f))
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#define ISSET(t, f) ((t) & (f))
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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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};
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static struct pt_softc **pt_softc = NULL; /* pty array */
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static int npty = 0; /* for pstat -t */
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static int maxptys = DEFAULT_MAXPTYS; /* maximum number of ptys (sysctable) */
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static struct simplelock pt_softc_mutex = SIMPLELOCK_INITIALIZER;
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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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void ptsstart __P((struct tty *));
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int pty_maxptys __P((int, int));
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static struct pt_softc **ptyarralloc __P((int));
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static int check_pty(int);
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dev_type_open(ptcopen);
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dev_type_close(ptcclose);
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dev_type_read(ptcread);
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dev_type_write(ptcwrite);
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dev_type_poll(ptcpoll);
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dev_type_kqfilter(ptckqfilter);
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dev_type_open(ptsopen);
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dev_type_close(ptsclose);
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dev_type_read(ptsread);
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dev_type_write(ptswrite);
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dev_type_stop(ptsstop);
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dev_type_poll(ptspoll);
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dev_type_ioctl(ptyioctl);
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dev_type_tty(ptytty);
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const struct cdevsw ptc_cdevsw = {
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ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl,
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nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY
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};
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const struct cdevsw pts_cdevsw = {
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ptsopen, ptsclose, ptsread, ptswrite, ptyioctl,
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ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY
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};
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#if defined(pmax)
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const struct cdevsw ptc_ultrix_cdevsw = {
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ptcopen, ptcclose, ptcread, ptcwrite, ptyioctl,
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nullstop, ptytty, ptcpoll, nommap, ptckqfilter, D_TTY
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};
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const struct cdevsw pts_ultrix_cdevsw = {
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ptsopen, ptsclose, ptsread, ptswrite, ptyioctl,
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ptsstop, ptytty, ptspoll, nommap, ttykqfilter, D_TTY
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};
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#endif /* defined(pmax) */
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/*
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* Allocate and zero array of nelem elements.
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*/
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static struct pt_softc **
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ptyarralloc(nelem)
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int nelem;
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{
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struct pt_softc **pt;
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nelem += 10;
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pt = malloc(nelem * sizeof *pt, M_DEVBUF, M_WAITOK | M_ZERO);
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return pt;
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}
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/*
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* Check if the minor is correct and ensure necessary structures
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* are properly allocated.
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*/
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static int
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check_pty(int ptn)
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{
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struct pt_softc *pti;
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if (ptn >= npty) {
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struct pt_softc **newpt, **oldpt;
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int newnpty;
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/* check if the requested pty can be granted */
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if (ptn >= maxptys) {
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limit_reached:
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tablefull("pty", "increase kern.maxptys");
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return (ENXIO);
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}
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/* Allocate a larger pty array */
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for (newnpty = npty; newnpty <= ptn;)
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newnpty *= 2;
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if (newnpty > maxptys)
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newnpty = maxptys;
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newpt = ptyarralloc(newnpty);
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/*
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* Now grab the pty array mutex - we need to ensure
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* that the pty array is consistent while copying it's
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* content to newly allocated, larger space; we also
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* need to be safe against pty_maxptys().
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*/
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simple_lock(&pt_softc_mutex);
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if (newnpty >= maxptys) {
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/* limit cut away beneath us... */
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newnpty = maxptys;
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if (ptn >= newnpty) {
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simple_unlock(&pt_softc_mutex);
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free(newpt, M_DEVBUF);
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goto limit_reached;
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}
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}
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/*
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* If the pty array was not enlarged while we were waiting
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* for mutex, copy current contents of pt_softc[] to newly
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* allocated array and start using the new bigger array.
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*/
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if (newnpty > npty) {
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memcpy(newpt, pt_softc, npty*sizeof(struct pt_softc *));
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oldpt = pt_softc;
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pt_softc = newpt;
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npty = newnpty;
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} else {
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/* was enlarged when waited for lock, free new space */
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oldpt = newpt;
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}
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simple_unlock(&pt_softc_mutex);
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free(oldpt, M_DEVBUF);
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}
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/*
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* If the entry is not yet allocated, allocate one. The mutex is
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* needed so that the state of pt_softc[] array is consistant
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* in case it has been lengthened above.
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*/
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if (!pt_softc[ptn]) {
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MALLOC(pti, struct pt_softc *, sizeof(struct pt_softc),
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M_DEVBUF, M_WAITOK);
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memset(pti, 0, sizeof(struct pt_softc));
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pti->pt_tty = ttymalloc();
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simple_lock(&pt_softc_mutex);
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/*
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* Check the entry again - it might have been
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* added while we were waiting for mutex.
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*/
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if (!pt_softc[ptn]) {
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tty_attach(pti->pt_tty);
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pt_softc[ptn] = pti;
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} else {
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ttyfree(pti->pt_tty);
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free(pti, M_DEVBUF);
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}
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simple_unlock(&pt_softc_mutex);
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}
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return (0);
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}
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/*
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* Set maxpty in thread-safe way. Returns 0 in case of error, otherwise
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* new value of maxptys.
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*/
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int
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pty_maxptys(newmax, set)
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int newmax, set;
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{
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if (!set)
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return (maxptys);
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/*
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* We have to grab the pt_softc lock, so that we would pick correct
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* value of npty (might be modified in check_pty()).
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*/
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simple_lock(&pt_softc_mutex);
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/*
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* The value cannot be set to value lower than the highest pty
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* number ever allocated.
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*/
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if (newmax >= npty)
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maxptys = newmax;
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else
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newmax = 0;
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simple_unlock(&pt_softc_mutex);
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return newmax;
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}
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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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/* maybe should allow 0 => none? */
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if (n <= 1)
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n = DEFAULT_NPTYS;
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pt_softc = ptyarralloc(n);
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npty = n;
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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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struct tty *tp;
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int error;
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int ptn = minor(dev);
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if ((error = check_pty(ptn)))
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return (error);
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pti = pt_softc[ptn];
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tp = pti->pt_tty;
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if (!ISSET(tp->t_state, TS_ISOPEN)) {
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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 (ISSET(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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SET(tp->t_state, TS_CARR_ON);
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if (!ISSET(flag, O_NONBLOCK)) {
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TTY_LOCK(tp);
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while (!ISSET(tp->t_state, TS_CARR_ON)) {
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tp->t_wopen++;
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error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
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ttopen, 0);
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tp->t_wopen--;
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if (error) {
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TTY_UNLOCK(tp);
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return (error);
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}
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}
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TTY_UNLOCK(tp);
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}
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error = (*tp->t_linesw->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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struct pt_softc *pti = pt_softc[minor(dev)];
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struct tty *tp = pti->pt_tty;
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int error;
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error = (*tp->t_linesw->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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struct pt_softc *pti = pt_softc[minor(dev)];
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struct tty *tp = pti->pt_tty;
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int error = 0;
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int cc;
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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 (sigismasked(p, 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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TTY_LOCK(tp);
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error = ttysleep(tp, (caddr_t)&lbolt,
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TTIPRI | PCATCH | PNORELOCK, ttybg, 0);
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if (error)
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return (error);
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}
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TTY_LOCK(tp);
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if (tp->t_canq.c_cc == 0) {
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if (flag & IO_NDELAY) {
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TTY_UNLOCK(tp);
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return (EWOULDBLOCK);
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}
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error = ttysleep(tp, (caddr_t)&tp->t_canq,
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TTIPRI | PCATCH | PNORELOCK, 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(error == 0 && tp->t_canq.c_cc > 1 && uio->uio_resid > 0) {
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TTY_UNLOCK(tp);
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error = ureadc(getc(&tp->t_canq), uio);
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TTY_LOCK(tp);
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/* Re-check terminal state here? */
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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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cc = tp->t_canq.c_cc;
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TTY_UNLOCK(tp);
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if (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 = (*tp->t_linesw->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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/*
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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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struct pt_softc *pti = pt_softc[minor(dev)];
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struct tty *tp = pti->pt_tty;
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|
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if (tp->t_oproc == 0)
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return (EIO);
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return ((*tp->t_linesw->l_write)(tp, uio, flag));
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}
|
|
|
|
/*
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|
* Poll pseudo-tty.
|
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*/
|
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int
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ptspoll(dev, events, p)
|
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dev_t dev;
|
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int events;
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struct proc *p;
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{
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struct pt_softc *pti = pt_softc[minor(dev)];
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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 ((*tp->t_linesw->l_poll)(tp, events, p));
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}
|
|
|
|
/*
|
|
* Start output on pseudo-tty.
|
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* Wake up process polling or sleeping for input from controlling tty.
|
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* Called with tty slock held.
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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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struct pt_softc *pti = pt_softc[minor(tp->t_dev)];
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|
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if (ISSET(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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|
|
selnotify(&pti->pt_selr, 0);
|
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wakeup((caddr_t)&tp->t_outq.c_cf);
|
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}
|
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|
|
/*
|
|
* Stop output.
|
|
* Called with tty slock held.
|
|
*/
|
|
void
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ptsstop(tp, flush)
|
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struct tty *tp;
|
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int flush;
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|
{
|
|
struct pt_softc *pti = pt_softc[minor(tp->t_dev)];
|
|
|
|
/* note: FLUSHREAD and FLUSHWRITE already ok */
|
|
if (flush == 0) {
|
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flush = TIOCPKT_STOP;
|
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pti->pt_flags |= PF_STOPPED;
|
|
} else
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|
pti->pt_flags &= ~PF_STOPPED;
|
|
pti->pt_send |= flush;
|
|
|
|
/* change of perspective */
|
|
if (flush & FREAD) {
|
|
selnotify(&pti->pt_selw, 0);
|
|
wakeup((caddr_t)&tp->t_rawq.c_cf);
|
|
}
|
|
if (flush & FWRITE) {
|
|
selnotify(&pti->pt_selr, 0);
|
|
wakeup((caddr_t)&tp->t_outq.c_cf);
|
|
}
|
|
}
|
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|
|
void
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|
ptcwakeup(tp, flag)
|
|
struct tty *tp;
|
|
int flag;
|
|
{
|
|
struct pt_softc *pti = pt_softc[minor(tp->t_dev)];
|
|
|
|
TTY_LOCK(tp);
|
|
if (flag & FREAD) {
|
|
selnotify(&pti->pt_selr, 0);
|
|
wakeup((caddr_t)&tp->t_outq.c_cf);
|
|
}
|
|
if (flag & FWRITE) {
|
|
selnotify(&pti->pt_selw, 0);
|
|
wakeup((caddr_t)&tp->t_rawq.c_cf);
|
|
}
|
|
TTY_UNLOCK(tp);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
ptcopen(dev, flag, devtype, p)
|
|
dev_t dev;
|
|
int flag, devtype;
|
|
struct proc *p;
|
|
{
|
|
struct pt_softc *pti;
|
|
struct tty *tp;
|
|
int error;
|
|
int ptn = minor(dev);
|
|
|
|
if ((error = check_pty(ptn)))
|
|
return (error);
|
|
|
|
pti = pt_softc[ptn];
|
|
tp = pti->pt_tty;
|
|
|
|
TTY_LOCK(tp);
|
|
if (tp->t_oproc) {
|
|
TTY_UNLOCK(tp);
|
|
return (EIO);
|
|
}
|
|
tp->t_oproc = ptsstart;
|
|
TTY_UNLOCK(tp);
|
|
(void)(*tp->t_linesw->l_modem)(tp, 1);
|
|
CLR(tp->t_lflag, EXTPROC);
|
|
pti->pt_flags = 0;
|
|
pti->pt_send = 0;
|
|
pti->pt_ucntl = 0;
|
|
return (0);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
ptcclose(dev, flag, devtype, p)
|
|
dev_t dev;
|
|
int flag, devtype;
|
|
struct proc *p;
|
|
{
|
|
struct pt_softc *pti = pt_softc[minor(dev)];
|
|
struct tty *tp = pti->pt_tty;
|
|
|
|
(void)(*tp->t_linesw->l_modem)(tp, 0);
|
|
CLR(tp->t_state, TS_CARR_ON);
|
|
TTY_LOCK(tp);
|
|
tp->t_oproc = 0; /* mark closed */
|
|
TTY_UNLOCK(tp);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ptcread(dev, uio, flag)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct pt_softc *pti = pt_softc[minor(dev)];
|
|
struct tty *tp = pti->pt_tty;
|
|
u_char buf[BUFSIZ];
|
|
int error = 0, cc;
|
|
|
|
/*
|
|
* We want to block until the slave
|
|
* is open, and there's something to read;
|
|
* but if we lost the slave or we're NBIO,
|
|
* then return the appropriate error instead.
|
|
*/
|
|
TTY_LOCK(tp);
|
|
for (;;) {
|
|
if (ISSET(tp->t_state, TS_ISOPEN)) {
|
|
if (pti->pt_flags & PF_PKT && pti->pt_send) {
|
|
TTY_UNLOCK(tp);
|
|
error = ureadc((int)pti->pt_send, uio);
|
|
if (error)
|
|
return (error);
|
|
/*
|
|
* Since we don't have the tty locked, there's
|
|
* a risk of messing up `t_termios'. This is
|
|
* relevant only if the tty got closed and then
|
|
* opened again while we were out uiomoving.
|
|
*/
|
|
if (pti->pt_send & TIOCPKT_IOCTL) {
|
|
cc = min(uio->uio_resid,
|
|
sizeof(tp->t_termios));
|
|
uiomove((caddr_t) &tp->t_termios,
|
|
cc, uio);
|
|
}
|
|
pti->pt_send = 0;
|
|
return (0);
|
|
}
|
|
if (pti->pt_flags & PF_UCNTL && pti->pt_ucntl) {
|
|
TTY_UNLOCK(tp);
|
|
error = ureadc((int)pti->pt_ucntl, uio);
|
|
if (error)
|
|
return (error);
|
|
pti->pt_ucntl = 0;
|
|
return (0);
|
|
}
|
|
if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP))
|
|
break;
|
|
}
|
|
if (!ISSET(tp->t_state, TS_CARR_ON)) {
|
|
error = 0; /* EOF */
|
|
goto out;
|
|
}
|
|
if (flag & IO_NDELAY) {
|
|
error = EWOULDBLOCK;
|
|
goto out;
|
|
}
|
|
error = ltsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH,
|
|
ttyin, 0, &tp->t_slock);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
if (pti->pt_flags & (PF_PKT|PF_UCNTL)) {
|
|
TTY_UNLOCK(tp);
|
|
error = ureadc(0, uio);
|
|
TTY_LOCK(tp);
|
|
if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN))
|
|
error = EIO;
|
|
}
|
|
while (uio->uio_resid > 0 && error == 0) {
|
|
cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
|
|
if (cc <= 0)
|
|
break;
|
|
TTY_UNLOCK(tp);
|
|
error = uiomove(buf, cc, uio);
|
|
TTY_LOCK(tp);
|
|
if (error == 0 && !ISSET(tp->t_state, TS_ISOPEN))
|
|
error = EIO;
|
|
}
|
|
|
|
if (tp->t_outq.c_cc <= tp->t_lowat) {
|
|
if (ISSET(tp->t_state, TS_ASLEEP)) {
|
|
CLR(tp->t_state, TS_ASLEEP);
|
|
wakeup((caddr_t)&tp->t_outq);
|
|
}
|
|
selnotify(&tp->t_wsel, 0);
|
|
}
|
|
out:
|
|
TTY_UNLOCK(tp);
|
|
return (error);
|
|
}
|
|
|
|
|
|
int
|
|
ptcwrite(dev, uio, flag)
|
|
dev_t dev;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
struct pt_softc *pti = pt_softc[minor(dev)];
|
|
struct tty *tp = pti->pt_tty;
|
|
u_char *cp = NULL;
|
|
int cc = 0;
|
|
u_char locbuf[BUFSIZ];
|
|
int cnt = 0;
|
|
int error = 0;
|
|
|
|
again:
|
|
TTY_LOCK(tp);
|
|
if (!ISSET(tp->t_state, TS_ISOPEN))
|
|
goto block;
|
|
if (pti->pt_flags & PF_REMOTE) {
|
|
if (tp->t_canq.c_cc)
|
|
goto block;
|
|
while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) {
|
|
if (cc == 0) {
|
|
cc = min(uio->uio_resid, BUFSIZ);
|
|
cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
|
|
cp = locbuf;
|
|
TTY_UNLOCK(tp);
|
|
error = uiomove((caddr_t)cp, cc, uio);
|
|
if (error)
|
|
return (error);
|
|
TTY_LOCK(tp);
|
|
/* check again for safety */
|
|
if (!ISSET(tp->t_state, TS_ISOPEN)) {
|
|
error = EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
if (cc)
|
|
(void) b_to_q(cp, cc, &tp->t_canq);
|
|
cc = 0;
|
|
}
|
|
(void) putc(0, &tp->t_canq);
|
|
ttwakeup(tp);
|
|
wakeup((caddr_t)&tp->t_canq);
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
while (uio->uio_resid > 0) {
|
|
if (cc == 0) {
|
|
cc = min(uio->uio_resid, BUFSIZ);
|
|
cp = locbuf;
|
|
TTY_UNLOCK(tp);
|
|
error = uiomove((caddr_t)cp, cc, uio);
|
|
if (error)
|
|
return (error);
|
|
TTY_LOCK(tp);
|
|
/* check again for safety */
|
|
if (!ISSET(tp->t_state, TS_ISOPEN)) {
|
|
error = EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
while (cc > 0) {
|
|
if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
|
|
(tp->t_canq.c_cc > 0 || !ISSET(tp->t_lflag, ICANON))) {
|
|
wakeup((caddr_t)&tp->t_rawq);
|
|
goto block;
|
|
}
|
|
/* XXX - should change l_rint to be called with lock
|
|
* see also tty.c:ttyinput_wlock()
|
|
*/
|
|
TTY_UNLOCK(tp);
|
|
(*tp->t_linesw->l_rint)(*cp++, tp);
|
|
TTY_LOCK(tp);
|
|
cnt++;
|
|
cc--;
|
|
}
|
|
cc = 0;
|
|
}
|
|
error = 0;
|
|
goto out;
|
|
|
|
block:
|
|
/*
|
|
* Come here to wait for slave to open, for space
|
|
* in outq, or space in rawq.
|
|
*/
|
|
if (!ISSET(tp->t_state, TS_CARR_ON)) {
|
|
error = EIO;
|
|
goto out;
|
|
}
|
|
if (flag & IO_NDELAY) {
|
|
/* adjust for data copied in but not written */
|
|
uio->uio_resid += cc;
|
|
error = cnt == 0 ? EWOULDBLOCK : 0;
|
|
goto out;
|
|
}
|
|
error = ltsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH | PNORELOCK,
|
|
ttyout, 0, &tp->t_slock);
|
|
if (error) {
|
|
/* adjust for data copied in but not written */
|
|
uio->uio_resid += cc;
|
|
return (error);
|
|
}
|
|
goto again;
|
|
|
|
out:
|
|
TTY_UNLOCK(tp);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
ptcpoll(dev, events, p)
|
|
dev_t dev;
|
|
int events;
|
|
struct proc *p;
|
|
{
|
|
struct pt_softc *pti = pt_softc[minor(dev)];
|
|
struct tty *tp = pti->pt_tty;
|
|
int revents = 0;
|
|
int s = splsoftclock();
|
|
|
|
if (events & (POLLIN | POLLRDNORM))
|
|
if (ISSET(tp->t_state, TS_ISOPEN) &&
|
|
((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) ||
|
|
((pti->pt_flags & PF_PKT) && pti->pt_send) ||
|
|
((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
if (ISSET(tp->t_state, TS_ISOPEN) &&
|
|
((pti->pt_flags & PF_REMOTE) ?
|
|
(tp->t_canq.c_cc == 0) :
|
|
((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) ||
|
|
(tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON)))))
|
|
revents |= events & (POLLOUT | POLLWRNORM);
|
|
|
|
if (events & POLLHUP)
|
|
if (!ISSET(tp->t_state, TS_CARR_ON))
|
|
revents |= POLLHUP;
|
|
|
|
if (revents == 0) {
|
|
if (events & (POLLIN | POLLHUP | POLLRDNORM))
|
|
selrecord(p, &pti->pt_selr);
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
selrecord(p, &pti->pt_selw);
|
|
}
|
|
|
|
splx(s);
|
|
return (revents);
|
|
}
|
|
|
|
static void
|
|
filt_ptcrdetach(struct knote *kn)
|
|
{
|
|
struct pt_softc *pti;
|
|
int s;
|
|
|
|
pti = kn->kn_hook;
|
|
s = spltty();
|
|
SLIST_REMOVE(&pti->pt_selr.sel_klist, kn, knote, kn_selnext);
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
filt_ptcread(struct knote *kn, long hint)
|
|
{
|
|
struct pt_softc *pti;
|
|
struct tty *tp;
|
|
int canread;
|
|
|
|
pti = kn->kn_hook;
|
|
tp = pti->pt_tty;
|
|
|
|
canread = (ISSET(tp->t_state, TS_ISOPEN) &&
|
|
((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) ||
|
|
((pti->pt_flags & PF_PKT) && pti->pt_send) ||
|
|
((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)));
|
|
|
|
if (canread) {
|
|
/*
|
|
* c_cc is number of characters after output post-processing;
|
|
* the amount of data actually read(2) depends on
|
|
* setting of input flags for the terminal.
|
|
*/
|
|
kn->kn_data = tp->t_outq.c_cc;
|
|
if (((pti->pt_flags & PF_PKT) && pti->pt_send) ||
|
|
((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))
|
|
kn->kn_data++;
|
|
}
|
|
|
|
return (canread);
|
|
}
|
|
|
|
static void
|
|
filt_ptcwdetach(struct knote *kn)
|
|
{
|
|
struct pt_softc *pti;
|
|
int s;
|
|
|
|
pti = kn->kn_hook;
|
|
s = spltty();
|
|
SLIST_REMOVE(&pti->pt_selw.sel_klist, kn, knote, kn_selnext);
|
|
splx(s);
|
|
}
|
|
|
|
static int
|
|
filt_ptcwrite(struct knote *kn, long hint)
|
|
{
|
|
struct pt_softc *pti;
|
|
struct tty *tp;
|
|
int canwrite;
|
|
int nwrite;
|
|
|
|
pti = kn->kn_hook;
|
|
tp = pti->pt_tty;
|
|
|
|
canwrite = (ISSET(tp->t_state, TS_ISOPEN) &&
|
|
((pti->pt_flags & PF_REMOTE) ?
|
|
(tp->t_canq.c_cc == 0) :
|
|
((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) ||
|
|
(tp->t_canq.c_cc == 0 && ISSET(tp->t_lflag, ICANON)))));
|
|
|
|
if (canwrite) {
|
|
if (pti->pt_flags & PF_REMOTE)
|
|
nwrite = tp->t_canq.c_cn;
|
|
else {
|
|
/* this is guaranteed to be > 0 due to above check */
|
|
nwrite = tp->t_canq.c_cn
|
|
- (tp->t_rawq.c_cc + tp->t_canq.c_cc);
|
|
}
|
|
kn->kn_data = nwrite;
|
|
}
|
|
|
|
return (canwrite);
|
|
}
|
|
|
|
static const struct filterops ptcread_filtops =
|
|
{ 1, NULL, filt_ptcrdetach, filt_ptcread };
|
|
static const struct filterops ptcwrite_filtops =
|
|
{ 1, NULL, filt_ptcwdetach, filt_ptcwrite };
|
|
|
|
int
|
|
ptckqfilter(dev_t dev, struct knote *kn)
|
|
{
|
|
struct pt_softc *pti = pt_softc[minor(dev)];
|
|
struct klist *klist;
|
|
int s;
|
|
|
|
switch (kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
klist = &pti->pt_selr.sel_klist;
|
|
kn->kn_fop = &ptcread_filtops;
|
|
break;
|
|
case EVFILT_WRITE:
|
|
klist = &pti->pt_selw.sel_klist;
|
|
kn->kn_fop = &ptcwrite_filtops;
|
|
break;
|
|
default:
|
|
return (1);
|
|
}
|
|
|
|
kn->kn_hook = pti;
|
|
|
|
s = spltty();
|
|
SLIST_INSERT_HEAD(klist, kn, kn_selnext);
|
|
splx(s);
|
|
|
|
return (0);
|
|
}
|
|
|
|
struct tty *
|
|
ptytty(dev)
|
|
dev_t dev;
|
|
{
|
|
struct pt_softc *pti = pt_softc[minor(dev)];
|
|
struct tty *tp = pti->pt_tty;
|
|
|
|
return (tp);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
ptyioctl(dev, cmd, data, flag, p)
|
|
dev_t dev;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
int flag;
|
|
struct proc *p;
|
|
{
|
|
struct pt_softc *pti = pt_softc[minor(dev)];
|
|
struct tty *tp = pti->pt_tty;
|
|
const struct cdevsw *cdev;
|
|
u_char *cc = tp->t_cc;
|
|
int stop, error, sig;
|
|
|
|
cdev = cdevsw_lookup(dev);
|
|
/*
|
|
* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
|
|
* ttywflush(tp) will hang if there are characters in the outq.
|
|
*/
|
|
if (cmd == TIOCEXT) {
|
|
/*
|
|
* When the EXTPROC bit is being toggled, we need
|
|
* to send an TIOCPKT_IOCTL if the packet driver
|
|
* is turned on.
|
|
*/
|
|
if (*(int *)data) {
|
|
if (pti->pt_flags & PF_PKT) {
|
|
pti->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
SET(tp->t_lflag, EXTPROC);
|
|
} else {
|
|
if (ISSET(tp->t_lflag, EXTPROC) &&
|
|
(pti->pt_flags & PF_PKT)) {
|
|
pti->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
CLR(tp->t_lflag, EXTPROC);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
if (cdev != NULL && cdev->d_open == ptcopen)
|
|
switch (cmd) {
|
|
|
|
case TIOCGPGRP:
|
|
/*
|
|
* We avoid calling ttioctl on the controller since,
|
|
* in that case, tp must be the controlling terminal.
|
|
*/
|
|
*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
|
|
return (0);
|
|
|
|
case TIOCPKT:
|
|
if (*(int *)data) {
|
|
if (pti->pt_flags & PF_UCNTL)
|
|
return (EINVAL);
|
|
pti->pt_flags |= PF_PKT;
|
|
} else
|
|
pti->pt_flags &= ~PF_PKT;
|
|
return (0);
|
|
|
|
case TIOCUCNTL:
|
|
if (*(int *)data) {
|
|
if (pti->pt_flags & PF_PKT)
|
|
return (EINVAL);
|
|
pti->pt_flags |= PF_UCNTL;
|
|
} else
|
|
pti->pt_flags &= ~PF_UCNTL;
|
|
return (0);
|
|
|
|
case TIOCREMOTE:
|
|
if (*(int *)data)
|
|
pti->pt_flags |= PF_REMOTE;
|
|
else
|
|
pti->pt_flags &= ~PF_REMOTE;
|
|
TTY_LOCK(tp);
|
|
ttyflush(tp, FREAD|FWRITE);
|
|
TTY_UNLOCK(tp);
|
|
return (0);
|
|
|
|
#ifdef COMPAT_OLDTTY
|
|
case TIOCSETP:
|
|
case TIOCSETN:
|
|
#endif
|
|
case TIOCSETD:
|
|
case TIOCSETA:
|
|
case TIOCSETAW:
|
|
case TIOCSETAF:
|
|
TTY_LOCK(tp);
|
|
ndflush(&tp->t_outq, tp->t_outq.c_cc);
|
|
TTY_UNLOCK(tp);
|
|
break;
|
|
|
|
case TIOCSIG:
|
|
sig = (int)(long)*(caddr_t *)data;
|
|
if (sig <= 0 || sig >= NSIG)
|
|
return (EINVAL);
|
|
TTY_LOCK(tp);
|
|
if (!ISSET(tp->t_lflag, NOFLSH))
|
|
ttyflush(tp, FREAD|FWRITE);
|
|
if ((sig == SIGINFO) &&
|
|
(!ISSET(tp->t_lflag, NOKERNINFO)))
|
|
ttyinfo(tp);
|
|
TTY_UNLOCK(tp);
|
|
pgsignal(tp->t_pgrp, sig, 1);
|
|
return(0);
|
|
}
|
|
|
|
error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, p);
|
|
if (error == EPASSTHROUGH)
|
|
error = ttioctl(tp, cmd, data, flag, p);
|
|
if (error == EPASSTHROUGH) {
|
|
if (pti->pt_flags & PF_UCNTL &&
|
|
(cmd & ~0xff) == UIOCCMD(0)) {
|
|
if (cmd & 0xff) {
|
|
pti->pt_ucntl = (u_char)cmd;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
return (0);
|
|
}
|
|
}
|
|
/*
|
|
* If external processing and packet mode send ioctl packet.
|
|
*/
|
|
if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) {
|
|
switch(cmd) {
|
|
case TIOCSETA:
|
|
case TIOCSETAW:
|
|
case TIOCSETAF:
|
|
#ifdef COMPAT_OLDTTY
|
|
case TIOCSETP:
|
|
case TIOCSETN:
|
|
case TIOCSETC:
|
|
case TIOCSLTC:
|
|
case TIOCLBIS:
|
|
case TIOCLBIC:
|
|
case TIOCLSET:
|
|
#endif
|
|
pti->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s'))
|
|
&& CCEQ(cc[VSTART], CTRL('q'));
|
|
if (pti->pt_flags & PF_NOSTOP) {
|
|
if (stop) {
|
|
pti->pt_send &= ~TIOCPKT_NOSTOP;
|
|
pti->pt_send |= TIOCPKT_DOSTOP;
|
|
pti->pt_flags &= ~PF_NOSTOP;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
} else {
|
|
if (!stop) {
|
|
pti->pt_send &= ~TIOCPKT_DOSTOP;
|
|
pti->pt_send |= TIOCPKT_NOSTOP;
|
|
pti->pt_flags |= PF_NOSTOP;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
}
|
|
return (error);
|
|
}
|