617 lines
14 KiB
C
617 lines
14 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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* 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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* $FreeBSD$
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*/
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/*
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* Pseudo-nulmodem driver
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* Mighty handy for use with serial console in Vmware
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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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#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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#include <sys/ioctl_compat.h>
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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/vnode.h>
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#include <sys/signalvar.h>
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#include <sys/malloc.h>
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MALLOC_DEFINE(M_NLMDM, "nullmodem", "nullmodem data structures");
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static void nmdmstart(struct tty *tp);
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static void nmdmstop(struct tty *tp, int rw);
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static void wakeup_other(struct tty *tp, int flag);
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static void nmdminit(int);
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static int nmdmshutdown(void);
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static d_open_t nmdmopen;
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static d_close_t nmdmclose;
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static d_read_t nmdmread;
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static d_write_t nmdmwrite;
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static d_ioctl_t nmdmioctl;
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#define CDEV_MAJOR 18
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static struct cdevsw nmdm_cdevsw = {
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.d_open = nmdmopen,
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.d_close = nmdmclose,
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.d_read = nmdmread,
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.d_write = nmdmwrite,
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.d_ioctl = nmdmioctl,
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.d_poll = ttypoll,
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.d_name = "pts",
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.d_maj = CDEV_MAJOR,
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.d_flags = D_TTY,
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};
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#define BUFSIZ 100 /* Chunk size iomoved to/from user */
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#define NMDM_MAX_NUM 128 /* Artificially limit # devices. */
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#define PF_STOPPED 0x10 /* user told stopped */
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struct softpart {
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struct tty nm_tty;
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dev_t dev;
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int modemsignals; /* bits defined in sys/ttycom.h */
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int gotbreak;
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};
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struct nm_softc {
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int pt_flags;
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struct softpart part1, part2;
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struct prison *pt_prison;
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};
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static void
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nmdm_crossover(struct nm_softc *pti,
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struct softpart *ourpart,
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struct softpart *otherpart);
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#define GETPARTS(tp, ourpart, otherpart) \
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do { \
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struct nm_softc *pti = tp->t_dev->si_drv1; \
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if (tp == &pti->part1.nm_tty) { \
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ourpart = &pti->part1; \
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otherpart = &pti->part2; \
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} else { \
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ourpart = &pti->part2; \
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otherpart = &pti->part1; \
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} \
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} while (0)
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/*
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* This function creates and initializes a pair of ttys.
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*/
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static void
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nmdminit(n)
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int n;
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{
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dev_t dev1, dev2;
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struct nm_softc *pt;
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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;
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pt = malloc(sizeof(*pt), M_NLMDM, M_WAITOK);
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bzero(pt, sizeof(*pt));
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pt->part1.dev = dev1 = make_dev(&nmdm_cdevsw, n+n,
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0, 0, 0666, "nmdm%dA", n);
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pt->part2.dev = dev2 = make_dev(&nmdm_cdevsw, n+n+1,
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0, 0, 0666, "nmdm%dB", n);
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dev1->si_drv1 = dev2->si_drv1 = pt;
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dev1->si_tty = &pt->part1.nm_tty;
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dev2->si_tty = &pt->part2.nm_tty;
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ttyregister(&pt->part1.nm_tty);
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ttyregister(&pt->part2.nm_tty);
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pt->part1.nm_tty.t_oproc = nmdmstart;
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pt->part2.nm_tty.t_oproc = nmdmstart;
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pt->part1.nm_tty.t_stop = nmdmstop;
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pt->part2.nm_tty.t_dev = dev1;
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pt->part1.nm_tty.t_dev = dev2;
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pt->part2.nm_tty.t_stop = nmdmstop;
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}
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/*
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* Device opened from userland
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*/
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static int
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nmdmopen(dev_t dev, int flag, int devtype, struct thread *td)
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{
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register struct tty *tp, *tp2;
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int error;
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int minr;
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dev_t nextdev;
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struct nm_softc *pti;
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int is_b;
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int pair;
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struct softpart *ourpart, *otherpart;
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/*
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* XXX: Gross hack for DEVFS:
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* If we openned this device, ensure we have the
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* next one too, so people can open it.
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*/
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minr = dev2unit(dev);
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pair = minr >> 1;
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is_b = minr & 1;
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if (pair < (NMDM_MAX_NUM - 1)) {
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nextdev = makedev(major(dev), minr + 2);
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if (!nextdev->si_drv1) {
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nmdminit(pair + 1);
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}
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} else { /* Limit ourselves to 128 of them for now */
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if (pair > (NMDM_MAX_NUM - 1))
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return (ENXIO);
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}
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if (!dev->si_drv1)
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nmdminit(pair);
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if (!dev->si_drv1)
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return(ENXIO);
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pti = dev->si_drv1;
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if (is_b)
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tp = &pti->part2.nm_tty;
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else
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tp = &pti->part1.nm_tty;
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GETPARTS(tp, ourpart, otherpart);
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tp2 = &otherpart->nm_tty;
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ourpart->modemsignals |= TIOCM_LE;
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if ((tp->t_state & TS_ISOPEN) == 0) {
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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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} else if (tp->t_state & TS_XCLUDE && suser(td)) {
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return (EBUSY);
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} else if (pti->pt_prison != td->td_ucred->cr_prison) {
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return (EBUSY);
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}
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/*
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* If the other side is open we have carrier
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*/
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if (tp2->t_state & TS_ISOPEN) {
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(void)(*linesw[tp->t_line].l_modem)(tp, 1);
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}
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/*
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* And the other side gets carrier as we are now open.
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*/
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(void)(*linesw[tp2->t_line].l_modem)(tp2, 1);
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/* External processing makes no sense here */
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tp->t_lflag &= ~EXTPROC;
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/*
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* Wait here if we don't have carrier.
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*/
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#if 0
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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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"nmdopn", 0);
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if (error)
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return (error);
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}
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#endif
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/*
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* Give the line disciplin a chance to set this end up.
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*/
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error = (*linesw[tp->t_line].l_open)(dev, tp);
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/*
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* Wake up the other side.
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* Theoretically not needed.
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*/
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ourpart->modemsignals |= TIOCM_DTR;
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nmdm_crossover(pti, ourpart, otherpart);
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if (error == 0)
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wakeup_other(tp, FREAD|FWRITE); /* XXX */
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return (error);
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}
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/*
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* Device closed again
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*/
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static int
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nmdmclose(dev_t dev, int flag, int mode, struct thread *td)
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{
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register struct tty *tp, *tp2;
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int err;
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struct softpart *ourpart, *otherpart;
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/*
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* let the other end know that the game is up
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*/
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tp = dev->si_tty;
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GETPARTS(tp, ourpart, otherpart);
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tp2 = &otherpart->nm_tty;
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(void)(*linesw[tp2->t_line].l_modem)(tp2, 0);
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/*
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* XXX MDMBUF makes no sense for nmdms 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 nmdms but
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* may be in use because other parts of the line discipline make
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* sense for nmdms. 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 (tp2->t_state & TS_ISOPEN) {
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tp2->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
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tp2->t_state |= TS_ZOMBIE;
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ttyflush(tp2, FREAD | FWRITE);
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}
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err = (*linesw[tp->t_line].l_close)(tp, flag);
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ourpart->modemsignals &= ~TIOCM_DTR;
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nmdm_crossover(dev->si_drv1, ourpart, otherpart);
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nmdmstop(tp, FREAD|FWRITE);
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(void) ttyclose(tp);
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return (err);
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}
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/*
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* handle read(2) request from userland
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*/
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static int
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nmdmread(dev_t dev, struct uio *uio, int flag)
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{
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int error = 0;
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struct tty *tp, *tp2;
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struct softpart *ourpart, *otherpart;
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tp = dev->si_tty;
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GETPARTS(tp, ourpart, otherpart);
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tp2 = &otherpart->nm_tty;
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#if 0
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if (tp2->t_state & TS_ISOPEN) {
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error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
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wakeup_other(tp, FWRITE);
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} else {
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if (flag & IO_NDELAY) {
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return (EWOULDBLOCK);
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}
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error = tsleep(TSA_PTC_READ(tp),
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TTIPRI | PCATCH, "nmdout", 0);
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}
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}
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#else
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if ((error = (*linesw[tp->t_line].l_read)(tp, uio, flag)) == 0)
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wakeup_other(tp, FWRITE);
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#endif
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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 nmdmstart.
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*/
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static int
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nmdmwrite(dev_t dev, struct uio *uio, int flag)
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{
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register u_char *cp = 0;
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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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struct tty *tp1, *tp;
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struct softpart *ourpart, *otherpart;
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tp1 = dev->si_tty;
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/*
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* Get the other tty struct.
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* basically we are writing into the INPUT side of the other device.
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*/
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GETPARTS(tp1, ourpart, otherpart);
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tp = &otherpart->nm_tty;
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again:
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if ((tp->t_state & TS_ISOPEN) == 0)
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return (EIO);
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while (uio->uio_resid > 0 || cc > 0) {
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/*
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* Fill up the buffer if it's empty
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*/
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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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/* 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_iflag&ICANON))) {
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/*
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* Come here to wait for space in outq,
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* or space in rawq, or an empty canq.
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*/
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wakeup(TSA_HUP_OR_INPUT(tp));
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if ((tp->t_state & TS_CONNECTED) == 0) {
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/*
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* Data piled up because not connected.
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* Adjust for data copied in but
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* not written.
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*/
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uio->uio_resid += cc;
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return (EIO);
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}
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if (flag & IO_NDELAY) {
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/*
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* Don't wait if asked not to.
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* Adjust for data copied in but
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* not written.
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*/
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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(TSA_PTC_WRITE(tp),
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TTOPRI | PCATCH, "nmdout", 0);
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if (error) {
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/*
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* Tsleep returned (signal?).
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* Go find out what the user wants.
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* adjust for data copied in but
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* not written
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*/
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uio->uio_resid += cc;
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return (error);
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}
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goto again;
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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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}
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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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nmdmstart(struct tty *tp)
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{
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register struct nm_softc *pti = tp->t_dev->si_drv1;
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if (tp->t_state & TS_TTSTOP)
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return;
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pti->pt_flags &= ~PF_STOPPED;
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wakeup_other(tp, FREAD);
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}
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/* Wakes up the OTHER tty;*/
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static void
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wakeup_other(struct tty *tp, int flag)
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{
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struct softpart *ourpart, *otherpart;
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GETPARTS(tp, ourpart, otherpart);
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if (flag & FREAD) {
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selwakeup(&otherpart->nm_tty.t_rsel);
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wakeup(TSA_PTC_READ((&otherpart->nm_tty)));
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}
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if (flag & FWRITE) {
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selwakeup(&otherpart->nm_tty.t_wsel);
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wakeup(TSA_PTC_WRITE((&otherpart->nm_tty)));
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}
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}
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/*
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* stopped output on tty, called when device is closed
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*/
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static void
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nmdmstop(register struct tty *tp, int flush)
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{
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struct nm_softc *pti = tp->t_dev->si_drv1;
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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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/* 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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wakeup_other(tp, flag);
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}
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/*
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* handle ioctl(2) request from userland
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*/
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static int
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nmdmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
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{
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register struct tty *tp = dev->si_tty;
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struct nm_softc *pti = dev->si_drv1;
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int error, s;
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register struct tty *tp2;
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struct softpart *ourpart, *otherpart;
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s = spltty();
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GETPARTS(tp, ourpart, otherpart);
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tp2 = &otherpart->nm_tty;
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error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
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if (error == ENOIOCTL)
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error = ttioctl(tp, cmd, data, flag);
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if (error == ENOIOCTL) {
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switch (cmd) {
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case TIOCSBRK:
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otherpart->gotbreak = 1;
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break;
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case TIOCCBRK:
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break;
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case TIOCSDTR:
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ourpart->modemsignals |= TIOCM_DTR;
|
|
break;
|
|
case TIOCCDTR:
|
|
ourpart->modemsignals &= TIOCM_DTR;
|
|
break;
|
|
case TIOCMSET:
|
|
ourpart->modemsignals = *(int *)data;
|
|
otherpart->modemsignals = *(int *)data;
|
|
break;
|
|
case TIOCMBIS:
|
|
ourpart->modemsignals |= *(int *)data;
|
|
break;
|
|
case TIOCMBIC:
|
|
ourpart->modemsignals &= ~(*(int *)data);
|
|
otherpart->modemsignals &= ~(*(int *)data);
|
|
break;
|
|
case TIOCMGET:
|
|
*(int *)data = ourpart->modemsignals;
|
|
break;
|
|
case TIOCMSDTRWAIT:
|
|
break;
|
|
case TIOCMGDTRWAIT:
|
|
*(int *)data = 0;
|
|
break;
|
|
case TIOCTIMESTAMP:
|
|
/* FALLTHROUGH */
|
|
case TIOCDCDTIMESTAMP:
|
|
default:
|
|
splx(s);
|
|
error = ENOTTY;
|
|
return (error);
|
|
}
|
|
error = 0;
|
|
nmdm_crossover(pti, ourpart, otherpart);
|
|
}
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
nmdm_crossover(struct nm_softc *pti, struct softpart *ourpart,
|
|
struct softpart *otherpart)
|
|
{
|
|
otherpart->modemsignals &= ~(TIOCM_CTS|TIOCM_CAR);
|
|
if (ourpart->modemsignals & TIOCM_RTS)
|
|
otherpart->modemsignals |= TIOCM_CTS;
|
|
if (ourpart->modemsignals & TIOCM_DTR)
|
|
otherpart->modemsignals |= TIOCM_CAR;
|
|
}
|
|
|
|
/*
|
|
* Module handling
|
|
*/
|
|
static int
|
|
nmdm_modevent(module_t mod, int type, void *data)
|
|
{
|
|
int error = 0;
|
|
|
|
switch(type) {
|
|
case MOD_LOAD: /* start with 4 of them */
|
|
nmdminit(0);
|
|
nmdminit(1);
|
|
nmdminit(2);
|
|
nmdminit(3);
|
|
break;
|
|
|
|
case MOD_SHUTDOWN:
|
|
/* FALLTHROUGH */
|
|
case MOD_UNLOAD:
|
|
nmdmshutdown();
|
|
break;
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Handle teardown of device
|
|
*/
|
|
static int
|
|
nmdmshutdown(void)
|
|
{
|
|
int i;
|
|
dev_t nextdev1;
|
|
dev_t nextdev2;
|
|
void * ptr1;
|
|
|
|
for(i = 0;( i < NMDM_MAX_NUM) ;i++) {
|
|
nextdev1 = makedev(CDEV_MAJOR, (i+i) );
|
|
nextdev2 = makedev(CDEV_MAJOR, (i+i) + 1);
|
|
ptr1 = nextdev1->si_drv1;
|
|
if (ptr1) {
|
|
revoke_and_destroy_dev(nextdev1);
|
|
revoke_and_destroy_dev(nextdev2);
|
|
free(ptr1, M_NLMDM);
|
|
} else {
|
|
freedev(nextdev1);
|
|
freedev(nextdev2);
|
|
}
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
DEV_MODULE(nmdm, nmdm_modevent, NULL);
|