621 lines
15 KiB
C
621 lines
15 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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(dev_t dev);
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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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static struct cdevsw nmdm_cdevsw = {
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.d_version = D_VERSION,
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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_name = "nmdn",
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.d_flags = D_TTY | D_PSEUDO | D_NEEDGIANT,
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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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#define BFLAG CLONE_FLAG0
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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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TAILQ_ENTRY(nm_softc) pt_list;
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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 struct clonedevs *nmdmclones;
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static TAILQ_HEAD(,nm_softc) nmdmhead = TAILQ_HEAD_INITIALIZER(nmdmhead);
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static void
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nmdm_clone(void *arg, char *name, int nameen, dev_t *dev)
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{
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int i, unit;
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char *p;
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dev_t d1, d2;
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if (*dev != NODEV)
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return;
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if (strcmp(name, "nmdm") == 0) {
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p = NULL;
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unit = -1;
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} else {
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i = dev_stdclone(name, &p, "nmdm", &unit);
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if (i == 0)
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return;
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if (p[0] != '\0' && p[0] != 'A' && p[0] != 'B')
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return;
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else if (p[0] != '\0' && p[1] != '\0')
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return;
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}
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i = clone_create(&nmdmclones, &nmdm_cdevsw, &unit, &d1, 0);
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if (i) {
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d1 = make_dev(&nmdm_cdevsw, unit2minor(unit),
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0, 0, 0666, "nmdm%dA", unit);
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if (d1 == NULL)
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return;
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d2 = make_dev(&nmdm_cdevsw, unit2minor(unit) | BFLAG,
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0, 0, 0666, "nmdm%dB", unit);
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if (d2 == NULL) {
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destroy_dev(d1);
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return;
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}
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d2->si_drv2 = d1;
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d1->si_drv2 = d2;
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dev_depends(d1, d2);
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dev_depends(d2, d1);
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d1->si_flags |= SI_CHEAPCLONE;
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d2->si_flags |= SI_CHEAPCLONE;
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}
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if (p != NULL && p[0] == 'B')
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*dev = d1->si_drv2;
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else
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*dev = d1;
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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(dev_t dev1)
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{
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dev_t dev2;
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struct nm_softc *pt;
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dev2 = dev1->si_drv2;
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dev1->si_flags &= ~SI_CHEAPCLONE;
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dev2->si_flags &= ~SI_CHEAPCLONE;
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pt = malloc(sizeof(*pt), M_NLMDM, M_WAITOK | M_ZERO);
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TAILQ_INSERT_TAIL(&nmdmhead, pt, pt_list);
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dev1->si_drv1 = dev2->si_drv1 = pt;
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pt->part1.dev = dev1;
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pt->part2.dev = dev2;
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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_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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}
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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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struct nm_softc *pti;
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struct softpart *ourpart, *otherpart;
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if (dev->si_drv1 == NULL)
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nmdminit(dev);
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pti = dev->si_drv1;
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if (minor(dev) & BFLAG)
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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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/*
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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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|
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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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selwakeuppri(&otherpart->nm_tty.t_rsel, TTIPRI);
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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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selwakeuppri(&otherpart->nm_tty.t_wsel, TTOPRI);
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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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/*
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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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|
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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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|
}
|
|
|
|
/*
|
|
* handle ioctl(2) request from userland
|
|
*/
|
|
static int
|
|
nmdmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
|
|
{
|
|
register struct tty *tp = dev->si_tty;
|
|
struct nm_softc *pti = dev->si_drv1;
|
|
int error, s;
|
|
register struct tty *tp2;
|
|
struct softpart *ourpart, *otherpart;
|
|
|
|
s = spltty();
|
|
GETPARTS(tp, ourpart, otherpart);
|
|
tp2 = &otherpart->nm_tty;
|
|
|
|
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
|
|
if (error == ENOIOCTL)
|
|
error = ttioctl(tp, cmd, data, flag);
|
|
if (error == ENOIOCTL) {
|
|
switch (cmd) {
|
|
case TIOCSBRK:
|
|
otherpart->gotbreak = 1;
|
|
break;
|
|
case TIOCCBRK:
|
|
break;
|
|
case TIOCSDTR:
|
|
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)
|
|
{
|
|
static eventhandler_tag tag;
|
|
struct nm_softc *pt, *tpt;
|
|
int error = 0;
|
|
|
|
switch(type) {
|
|
case MOD_LOAD:
|
|
clone_setup(&nmdmclones);
|
|
tag = EVENTHANDLER_REGISTER(dev_clone, nmdm_clone, 0, 1000);
|
|
if (tag == NULL)
|
|
return (ENOMEM);
|
|
break;
|
|
|
|
case MOD_SHUTDOWN:
|
|
/* FALLTHROUGH */
|
|
case MOD_UNLOAD:
|
|
EVENTHANDLER_DEREGISTER(dev_clone, tag);
|
|
TAILQ_FOREACH_SAFE(pt, &nmdmhead, pt_list, tpt) {
|
|
destroy_dev(pt->part1.dev);
|
|
TAILQ_REMOVE(&nmdmhead, pt, pt_list);
|
|
free(pt, M_NLMDM);
|
|
}
|
|
clone_cleanup(&nmdmclones);
|
|
break;
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
DEV_MODULE(nmdm, nmdm_modevent, NULL);
|