725 lines
17 KiB
C
725 lines
17 KiB
C
/*-
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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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* 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 "opt_compat.h"
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#include "opt_tty.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#ifndef BURN_BRIDGES
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#if defined(COMPAT_43)
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#include <sys/ioctl_compat.h>
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#endif
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#endif
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/poll.h>
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#include <sys/kernel.h>
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#include <sys/uio.h>
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#include <sys/signalvar.h>
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#include <sys/malloc.h>
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static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
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static void ptsstart(struct tty *tp);
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static void ptsstop(struct tty *tp, int rw);
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static void ptcwakeup(struct tty *tp, int flag);
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static struct cdev *ptyinit(struct cdev *cdev);
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static d_open_t ptsopen;
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static d_close_t ptsclose;
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static d_read_t ptsread;
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static d_write_t ptswrite;
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static d_ioctl_t ptsioctl;
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static d_open_t ptcopen;
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static d_close_t ptcclose;
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static d_read_t ptcread;
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static d_ioctl_t ptcioctl;
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static d_write_t ptcwrite;
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static d_poll_t ptcpoll;
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static struct cdevsw pts_cdevsw = {
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.d_version = D_VERSION,
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.d_open = ptsopen,
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.d_close = ptsclose,
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.d_read = ptsread,
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.d_write = ptswrite,
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.d_ioctl = ptsioctl,
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.d_name = "pts",
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.d_flags = D_TTY | D_NEEDGIANT,
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};
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static struct cdevsw ptc_cdevsw = {
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.d_version = D_VERSION,
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.d_open = ptcopen,
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.d_close = ptcclose,
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.d_read = ptcread,
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.d_write = ptcwrite,
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.d_ioctl = ptcioctl,
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.d_poll = ptcpoll,
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.d_name = "ptc",
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.d_flags = D_TTY | D_NEEDGIANT,
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};
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#define BUFSIZ 100 /* Chunk size iomoved to/from user */
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struct ptsc {
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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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struct tty *pt_tty;
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struct cdev *devs, *devc;
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struct prison *pt_prison;
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};
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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_NOSTOP 0x40
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#define PF_UCNTL 0x80 /* user control mode */
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#define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf)
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#define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl)
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#define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq)
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static char *names = "pqrsPQRS";
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/*
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* This function creates and initializes a pts/ptc pair
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*
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* pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
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* ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
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*
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* XXX: define and add mapping of upper minor bits to allow more
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* than 256 ptys.
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*/
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static struct cdev *
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ptyinit(struct cdev *devc)
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{
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struct cdev *devs;
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struct ptsc *pt;
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int n;
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n = minor(devc);
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/* For now we only map the lower 8 bits of the minor */
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if (n & ~0xff)
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return (NULL);
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devc->si_flags &= ~SI_CHEAPCLONE;
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pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
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pt->devs = devs = make_dev(&pts_cdevsw, n,
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UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32);
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pt->devc = devc;
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pt->pt_tty = ttymalloc(pt->pt_tty);
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pt->pt_tty->t_sc = pt;
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devs->si_drv1 = devc->si_drv1 = pt;
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devs->si_tty = devc->si_tty = pt->pt_tty;
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pt->pt_tty->t_dev = devs;
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return (devc);
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}
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/*ARGSUSED*/
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static int
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ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td)
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{
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struct tty *tp;
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int error;
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struct ptsc *pt;
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if (!dev->si_drv1)
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return(ENXIO);
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pt = dev->si_drv1;
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tp = dev->si_tty;
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if ((tp->t_state & TS_ISOPEN) == 0) {
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ttyinitmode(tp, 1, 0);
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} else if (tp->t_state & TS_XCLUDE && suser(td))
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return (EBUSY);
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else if (pt->pt_prison != td->td_ucred->cr_prison)
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return (EBUSY);
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if (tp->t_oproc) /* Ctrlr still around. */
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(void)ttyld_modem(tp, 1);
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while ((tp->t_state & TS_CARR_ON) == 0) {
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if (flag&FNONBLOCK)
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break;
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error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
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"ptsopn", 0);
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if (error)
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return (error);
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}
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error = ttyld_open(tp, dev);
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if (error == 0)
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ptcwakeup(tp, FREAD|FWRITE);
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return (error);
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}
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static int
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ptsclose(struct cdev *dev, int flag, int mode, struct thread *td)
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{
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struct tty *tp;
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int err;
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tp = dev->si_tty;
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err = ttyld_close(tp, flag);
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(void) tty_close(tp);
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return (err);
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}
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static int
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ptsread(struct cdev *dev, struct uio *uio, int flag)
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{
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struct tty *tp = dev->si_tty;
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int error = 0;
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if (tp->t_oproc)
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error = ttyld_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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static int
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ptswrite(struct cdev *dev, struct uio *uio, int flag)
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{
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struct tty *tp;
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tp = dev->si_tty;
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if (tp->t_oproc == 0)
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return (EIO);
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return (ttyld_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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static void
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ptsstart(struct tty *tp)
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{
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struct ptsc *pt = tp->t_sc;
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if (tp->t_state & TS_TTSTOP)
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return;
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if (pt->pt_flags & PF_STOPPED) {
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pt->pt_flags &= ~PF_STOPPED;
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pt->pt_send = TIOCPKT_START;
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}
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ptcwakeup(tp, FREAD);
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}
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static void
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ptcwakeup(struct tty *tp, int flag)
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{
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struct ptsc *pt = tp->t_sc;
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if (flag & FREAD) {
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selwakeuppri(&pt->pt_selr, TTIPRI);
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wakeup(TSA_PTC_READ(tp));
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}
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if (flag & FWRITE) {
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selwakeuppri(&pt->pt_selw, TTOPRI);
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wakeup(TSA_PTC_WRITE(tp));
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}
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}
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static int
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ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td)
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{
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struct tty *tp;
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struct ptsc *pt;
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if (!dev->si_drv1)
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ptyinit(dev);
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if (!dev->si_drv1)
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return(ENXIO);
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tp = dev->si_tty;
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if (tp->t_oproc)
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return (EIO);
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tp->t_timeout = -1;
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tp->t_oproc = ptsstart;
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tp->t_stop = ptsstop;
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(void)ttyld_modem(tp, 1);
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tp->t_lflag &= ~EXTPROC;
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pt = dev->si_drv1;
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pt->pt_prison = td->td_ucred->cr_prison;
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pt->pt_flags = 0;
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pt->pt_send = 0;
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pt->pt_ucntl = 0;
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return (0);
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}
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static int
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ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct tty *tp;
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tp = dev->si_tty;
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(void)ttyld_modem(tp, 0);
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/*
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* XXX MDMBUF makes no sense for ptys but would inhibit the above
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* l_modem(). CLOCAL makes sense but isn't supported. Special
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* l_modem()s that ignore carrier drop make no sense for ptys but
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* may be in use because other parts of the line discipline make
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* sense for ptys. Recover by doing everything that a normal
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* ttymodem() would have done except for sending a SIGHUP.
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*/
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if (tp->t_state & TS_ISOPEN) {
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tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
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tp->t_state |= TS_ZOMBIE;
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ttyflush(tp, FREAD | FWRITE);
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}
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tp->t_oproc = 0; /* mark closed */
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return (0);
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}
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static int
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ptcread(struct cdev *dev, struct uio *uio, int flag)
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{
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struct tty *tp = dev->si_tty;
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struct ptsc *pt = dev->si_drv1;
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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 (pt->pt_flags&PF_PKT && pt->pt_send) {
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error = ureadc((int)pt->pt_send, uio);
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if (error)
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return (error);
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if (pt->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(&tp->t_termios, cc, uio);
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}
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pt->pt_send = 0;
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return (0);
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}
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if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) {
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error = ureadc((int)pt->pt_ucntl, uio);
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if (error)
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return (error);
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pt->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_CONNECTED) == 0)
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return (0); /* EOF */
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if (flag & O_NONBLOCK)
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return (EWOULDBLOCK);
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error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
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if (error)
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return (error);
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}
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if (pt->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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ttwwakeup(tp);
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return (error);
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}
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static void
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ptsstop(struct tty *tp, int flush)
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{
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struct ptsc *pt = tp->t_sc;
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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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pt->pt_flags |= PF_STOPPED;
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} else
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pt->pt_flags &= ~PF_STOPPED;
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pt->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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}
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static int
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ptcpoll(struct cdev *dev, int events, struct thread *td)
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{
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struct tty *tp = dev->si_tty;
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struct ptsc *pt = dev->si_drv1;
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int revents = 0;
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int s;
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if ((tp->t_state & TS_CONNECTED) == 0)
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return (events &
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(POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM));
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/*
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* Need to block timeouts (ttrstart).
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*/
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s = spltty();
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if (events & (POLLIN | POLLRDNORM))
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if ((tp->t_state & TS_ISOPEN) &&
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((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
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((pt->pt_flags & PF_PKT) && pt->pt_send) ||
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((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl)))
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revents |= events & (POLLIN | POLLRDNORM);
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if (events & (POLLOUT | POLLWRNORM))
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if (tp->t_state & TS_ISOPEN &&
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(((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
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(tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)))))
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revents |= events & (POLLOUT | POLLWRNORM);
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if (events & POLLHUP)
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if ((tp->t_state & TS_CARR_ON) == 0)
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revents |= POLLHUP;
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if (revents == 0) {
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if (events & (POLLIN | POLLRDNORM))
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selrecord(td, &pt->pt_selr);
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if (events & (POLLOUT | POLLWRNORM))
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selrecord(td, &pt->pt_selw);
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}
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splx(s);
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return (revents);
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}
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static int
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ptcwrite(struct cdev *dev, struct uio *uio, int flag)
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{
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struct tty *tp = dev->si_tty;
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u_char *cp = 0;
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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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while (uio->uio_resid > 0 || cc > 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(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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/* adjust for data copied in but not written */
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uio->uio_resid += cc;
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return (EIO);
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}
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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_lflag&ICANON))) {
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wakeup(TSA_HUP_OR_INPUT(tp));
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goto block;
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}
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ttyld_rint(tp, *cp++);
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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, or an empty canq.
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*/
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if ((tp->t_state & TS_CONNECTED) == 0) {
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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 (EIO);
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}
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if (flag & O_NONBLOCK) {
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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);
|
|
}
|
|
error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
|
|
if (error) {
|
|
/* adjust for data copied in but not written */
|
|
uio->uio_resid += cc;
|
|
return (error);
|
|
}
|
|
goto again;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
ptcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
|
|
{
|
|
struct tty *tp = dev->si_tty;
|
|
struct ptsc *pt = dev->si_drv1;
|
|
|
|
switch (cmd) {
|
|
|
|
case TIOCGPGRP:
|
|
/*
|
|
* We avoid calling ttioctl on the controller since,
|
|
* in that case, tp must be the controlling terminal.
|
|
*/
|
|
*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
|
|
return (0);
|
|
|
|
case TIOCPKT:
|
|
if (*(int *)data) {
|
|
if (pt->pt_flags & PF_UCNTL)
|
|
return (EINVAL);
|
|
pt->pt_flags |= PF_PKT;
|
|
} else
|
|
pt->pt_flags &= ~PF_PKT;
|
|
return (0);
|
|
|
|
case TIOCUCNTL:
|
|
if (*(int *)data) {
|
|
if (pt->pt_flags & PF_PKT)
|
|
return (EINVAL);
|
|
pt->pt_flags |= PF_UCNTL;
|
|
} else
|
|
pt->pt_flags &= ~PF_UCNTL;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The rest of the ioctls shouldn't be called until
|
|
* the slave is open.
|
|
*/
|
|
if ((tp->t_state & TS_ISOPEN) == 0)
|
|
return (EAGAIN);
|
|
|
|
switch (cmd) {
|
|
#ifndef BURN_BRIDGES
|
|
#ifdef COMPAT_43
|
|
case TIOCSETP:
|
|
case TIOCSETN:
|
|
#endif
|
|
#endif
|
|
case TIOCSETD:
|
|
case TIOCSETA:
|
|
case TIOCSETAW:
|
|
case TIOCSETAF:
|
|
/*
|
|
* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
|
|
* ttywflush(tp) will hang if there are characters in
|
|
* the outq.
|
|
*/
|
|
ndflush(&tp->t_outq, tp->t_outq.c_cc);
|
|
break;
|
|
|
|
case TIOCSIG:
|
|
if (*(unsigned int *)data >= NSIG ||
|
|
*(unsigned int *)data == 0)
|
|
return(EINVAL);
|
|
if ((tp->t_lflag&NOFLSH) == 0)
|
|
ttyflush(tp, FREAD|FWRITE);
|
|
if (tp->t_pgrp != NULL) {
|
|
PGRP_LOCK(tp->t_pgrp);
|
|
pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
|
|
PGRP_UNLOCK(tp->t_pgrp);
|
|
}
|
|
if ((*(unsigned int *)data == SIGINFO) &&
|
|
((tp->t_lflag&NOKERNINFO) == 0))
|
|
ttyinfo(tp);
|
|
return(0);
|
|
}
|
|
|
|
return (ptsioctl(dev, cmd, data, flag, td));
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
ptsioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
|
|
{
|
|
struct tty *tp = dev->si_tty;
|
|
struct ptsc *pt = dev->si_drv1;
|
|
u_char *cc = tp->t_cc;
|
|
int stop, error;
|
|
|
|
if (cmd == TIOCEXT) {
|
|
/*
|
|
* When the EXTPROC bit is being toggled, we need
|
|
* to send an TIOCPKT_IOCTL if the packet driver
|
|
* is turned on.
|
|
*/
|
|
if (*(int *)data) {
|
|
if (pt->pt_flags & PF_PKT) {
|
|
pt->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
tp->t_lflag |= EXTPROC;
|
|
} else {
|
|
if ((tp->t_lflag & EXTPROC) &&
|
|
(pt->pt_flags & PF_PKT)) {
|
|
pt->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
tp->t_lflag &= ~EXTPROC;
|
|
}
|
|
return(0);
|
|
}
|
|
error = ttyioctl(dev, cmd, data, flag, td);
|
|
if (error == ENOTTY) {
|
|
if (pt->pt_flags & PF_UCNTL &&
|
|
(cmd & ~0xff) == UIOCCMD(0)) {
|
|
if (cmd & 0xff) {
|
|
pt->pt_ucntl = (u_char)cmd;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
return (0);
|
|
}
|
|
error = ENOTTY;
|
|
}
|
|
/*
|
|
* If external processing and packet mode send ioctl packet.
|
|
*/
|
|
if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) {
|
|
switch(cmd) {
|
|
case TIOCSETA:
|
|
case TIOCSETAW:
|
|
case TIOCSETAF:
|
|
#ifndef BURN_BRIDGES
|
|
#ifdef COMPAT_43
|
|
case TIOCSETP:
|
|
case TIOCSETN:
|
|
case TIOCSETC:
|
|
case TIOCSLTC:
|
|
case TIOCLBIS:
|
|
case TIOCLBIC:
|
|
case TIOCLSET:
|
|
#endif
|
|
#endif
|
|
pt->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
|
|
&& CCEQ(cc[VSTART], CTRL('q'));
|
|
if (pt->pt_flags & PF_NOSTOP) {
|
|
if (stop) {
|
|
pt->pt_send &= ~TIOCPKT_NOSTOP;
|
|
pt->pt_send |= TIOCPKT_DOSTOP;
|
|
pt->pt_flags &= ~PF_NOSTOP;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
} else {
|
|
if (!stop) {
|
|
pt->pt_send &= ~TIOCPKT_DOSTOP;
|
|
pt->pt_send |= TIOCPKT_NOSTOP;
|
|
pt->pt_flags |= PF_NOSTOP;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
pty_clone(void *arg, char *name, int namelen, struct cdev **dev)
|
|
{
|
|
int u;
|
|
|
|
if (*dev != NULL)
|
|
return;
|
|
if (bcmp(name, "pty", 3) != 0)
|
|
return;
|
|
if (name[5] != '\0')
|
|
return;
|
|
switch (name[3]) {
|
|
case 'p': u = 0; break;
|
|
case 'q': u = 32; break;
|
|
case 'r': u = 64; break;
|
|
case 's': u = 96; break;
|
|
case 'P': u = 128; break;
|
|
case 'Q': u = 160; break;
|
|
case 'R': u = 192; break;
|
|
case 'S': u = 224; break;
|
|
default: return;
|
|
}
|
|
if (name[4] >= '0' && name[4] <= '9')
|
|
u += name[4] - '0';
|
|
else if (name[4] >= 'a' && name[4] <= 'v')
|
|
u += name[4] - 'a' + 10;
|
|
else
|
|
return;
|
|
*dev = make_dev(&ptc_cdevsw, u,
|
|
UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32);
|
|
(*dev)->si_flags |= SI_CHEAPCLONE;
|
|
return;
|
|
}
|
|
|
|
static void
|
|
ptc_drvinit(void *unused)
|
|
{
|
|
|
|
EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000);
|
|
}
|
|
|
|
SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,ptc_drvinit,NULL)
|