/* * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/sys/dev/nmdm/nmdm.c,v 1.5.2.1 2001/08/11 00:54:14 mp Exp $ * $DragonFly: src/sys/dev/misc/nmdm/nmdm.c,v 1.3 2003/06/23 17:55:33 dillon Exp $ */ /* * Pseudo-nulmodem Driver */ #include "opt_compat.h" #include #include #if defined(COMPAT_43) || defined(COMPAT_SUNOS) #include #endif #include #include #include #include #include #include #include #include #include MALLOC_DEFINE(M_NLMDM, "nullmodem", "nullmodem data structures"); static void nmdmstart __P((struct tty *tp)); static void nmdmstop __P((struct tty *tp, int rw)); static void wakeup_other __P((struct tty *tp, int flag)); static void nmdminit __P((int n)); static d_open_t nmdmopen; static d_close_t nmdmclose; static d_read_t nmdmread; static d_write_t nmdmwrite; static d_ioctl_t nmdmioctl; #define CDEV_MAJOR 18 static struct cdevsw nmdm_cdevsw = { /* open */ nmdmopen, /* close */ nmdmclose, /* read */ nmdmread, /* write */ nmdmwrite, /* ioctl */ nmdmioctl, /* poll */ ttypoll, /* mmap */ nommap, /* strategy */ nostrategy, /* name */ "pts", /* maj */ CDEV_MAJOR, /* dump */ nodump, /* psize */ nopsize, /* flags */ D_TTY, /* bmaj */ -1 }; #define BUFSIZ 100 /* Chunk size iomoved to/from user */ struct softpart { struct tty nm_tty; dev_t dev; int modemsignals; /* bits defined in sys/ttycom.h */ int gotbreak; }; struct nm_softc { int pt_flags; struct softpart part1, part2; struct prison *pt_prison; }; #define PF_STOPPED 0x10 /* user told stopped */ static void nmdm_crossover(struct nm_softc *pti, struct softpart *ourpart, struct softpart *otherpart); #define GETPARTS(tp, ourpart, otherpart) \ do { \ struct nm_softc *pti = tp->t_dev->si_drv1; \ if (tp == &pti->part1.nm_tty) { \ ourpart = &pti->part1; \ otherpart = &pti->part2; \ } else { \ ourpart = &pti->part2; \ otherpart = &pti->part1; \ } \ } while (0) /* * This function creates and initializes a pair of ttys. */ static void nmdminit(n) int n; { dev_t dev1, dev2; struct nm_softc *pt; /* For now we only map the lower 8 bits of the minor */ if (n & ~0xff) return; pt = malloc(sizeof(*pt), M_NLMDM, M_WAITOK); bzero(pt, sizeof(*pt)); pt->part1.dev = dev1 = make_dev(&nmdm_cdevsw, n+n, 0, 0, 0666, "nmdm%dA", n); pt->part2.dev = dev2 = make_dev(&nmdm_cdevsw, n+n+1, 0, 0, 0666, "nmdm%dB", n); dev1->si_drv1 = dev2->si_drv1 = pt; dev1->si_tty = &pt->part1.nm_tty; dev2->si_tty = &pt->part2.nm_tty; ttyregister(&pt->part1.nm_tty); ttyregister(&pt->part2.nm_tty); pt->part1.nm_tty.t_oproc = nmdmstart; pt->part2.nm_tty.t_oproc = nmdmstart; pt->part1.nm_tty.t_stop = nmdmstop; pt->part2.nm_tty.t_dev = dev1; pt->part1.nm_tty.t_dev = dev2; pt->part2.nm_tty.t_stop = nmdmstop; } /*ARGSUSED*/ static int nmdmopen(dev_t dev, int flag, int devtype, struct thread *td) { struct proc *p = td->td_proc; struct tty *tp, *tp2; int error; int minr; dev_t nextdev; struct nm_softc *pti; int is_b; int pair; struct softpart *ourpart, *otherpart; KKASSERT(p != NULL); /* * XXX: Gross hack for DEVFS: * If we openned this device, ensure we have the * next one too, so people can open it. */ minr = lminor(dev); pair = minr >> 1; is_b = minr & 1; if (pair < 127) { nextdev = makedev(major(dev), (pair+pair) + 1); if (!nextdev->si_drv1) { nmdminit(pair + 1); } } if (!dev->si_drv1) nmdminit(pair); if (!dev->si_drv1) return(ENXIO); pti = dev->si_drv1; if (is_b) tp = &pti->part2.nm_tty; else tp = &pti->part1.nm_tty; GETPARTS(tp, ourpart, otherpart); tp2 = &otherpart->nm_tty; ourpart->modemsignals |= TIOCM_LE; if ((tp->t_state & TS_ISOPEN) == 0) { ttychars(tp); /* Set up default chars */ tp->t_iflag = TTYDEF_IFLAG; tp->t_oflag = TTYDEF_OFLAG; tp->t_lflag = TTYDEF_LFLAG; tp->t_cflag = TTYDEF_CFLAG; tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; } else if (tp->t_state & TS_XCLUDE && suser_xxx(p->p_ucred, 0)) { return (EBUSY); } else if (pti->pt_prison != p->p_ucred->cr_prison) { return (EBUSY); } /* * If the other side is open we have carrier */ if (tp2->t_state & TS_ISOPEN) { (void)(*linesw[tp->t_line].l_modem)(tp, 1); } /* * And the other side gets carrier as we are now open. */ (void)(*linesw[tp2->t_line].l_modem)(tp2, 1); /* External processing makes no sense here */ tp->t_lflag &= ~EXTPROC; /* * Wait here if we don't have carrier. */ #if 0 while ((tp->t_state & TS_CARR_ON) == 0) { if (flag & FNONBLOCK) break; error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, "nmdopn", 0); if (error) return (error); } #endif /* * Give the line disciplin a chance to set this end up. */ error = (*linesw[tp->t_line].l_open)(dev, tp); /* * Wake up the other side. * Theoretically not needed. */ ourpart->modemsignals |= TIOCM_DTR; nmdm_crossover(pti, ourpart, otherpart); if (error == 0) wakeup_other(tp, FREAD|FWRITE); /* XXX */ return (error); } static int nmdmclose(dev_t dev, int flag, int mode, struct thread *td) { register struct tty *tp, *tp2; int err; struct softpart *ourpart, *otherpart; /* * let the other end know that the game is up */ tp = dev->si_tty; GETPARTS(tp, ourpart, otherpart); tp2 = &otherpart->nm_tty; (void)(*linesw[tp2->t_line].l_modem)(tp2, 0); /* * XXX MDMBUF makes no sense for nmdms but would inhibit the above * l_modem(). CLOCAL makes sense but isn't supported. Special * l_modem()s that ignore carrier drop make no sense for nmdms but * may be in use because other parts of the line discipline make * sense for nmdms. Recover by doing everything that a normal * ttymodem() would have done except for sending a SIGHUP. */ if (tp2->t_state & TS_ISOPEN) { tp2->t_state &= ~(TS_CARR_ON | TS_CONNECTED); tp2->t_state |= TS_ZOMBIE; ttyflush(tp2, FREAD | FWRITE); } err = (*linesw[tp->t_line].l_close)(tp, flag); ourpart->modemsignals &= ~TIOCM_DTR; nmdm_crossover(dev->si_drv1, ourpart, otherpart); nmdmstop(tp, FREAD|FWRITE); (void) ttyclose(tp); return (err); } static int nmdmread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { int error = 0; struct tty *tp, *tp2; struct softpart *ourpart, *otherpart; tp = dev->si_tty; GETPARTS(tp, ourpart, otherpart); tp2 = &otherpart->nm_tty; #if 0 if (tp2->t_state & TS_ISOPEN) { error = (*linesw[tp->t_line].l_read)(tp, uio, flag); wakeup_other(tp, FWRITE); } else { if (flag & IO_NDELAY) { return (EWOULDBLOCK); } error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "nmdout", 0); } } #else if ((error = (*linesw[tp->t_line].l_read)(tp, uio, flag)) == 0) wakeup_other(tp, FWRITE); #endif return (error); } /* * Write to pseudo-tty. * Wakeups of controlling tty will happen * indirectly, when tty driver calls nmdmstart. */ static int nmdmwrite(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { register u_char *cp = 0; register int cc = 0; u_char locbuf[BUFSIZ]; int cnt = 0; int error = 0; struct tty *tp1, *tp; struct softpart *ourpart, *otherpart; tp1 = dev->si_tty; /* * Get the other tty struct. * basically we are writing into the INPUT side of the other device. */ GETPARTS(tp1, ourpart, otherpart); tp = &otherpart->nm_tty; again: if ((tp->t_state & TS_ISOPEN) == 0) return (EIO); while (uio->uio_resid > 0 || cc > 0) { /* * Fill up the buffer if it's empty */ if (cc == 0) { cc = min(uio->uio_resid, BUFSIZ); cp = locbuf; error = uiomove((caddr_t)cp, cc, uio); if (error) return (error); /* check again for safety */ if ((tp->t_state & TS_ISOPEN) == 0) { /* adjust for data copied in but not written */ uio->uio_resid += cc; return (EIO); } } while (cc > 0) { if (((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= (TTYHOG-2)) && ((tp->t_canq.c_cc > 0) || !(tp->t_iflag&ICANON))) { /* * Come here to wait for space in outq, * or space in rawq, or an empty canq. */ wakeup(TSA_HUP_OR_INPUT(tp)); if ((tp->t_state & TS_CONNECTED) == 0) { /* * Data piled up because not connected. * Adjust for data copied in but * not written. */ uio->uio_resid += cc; return (EIO); } if (flag & IO_NDELAY) { /* * Don't wait if asked not to. * Adjust for data copied in but * not written. */ uio->uio_resid += cc; if (cnt == 0) return (EWOULDBLOCK); return (0); } error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "nmdout", 0); if (error) { /* * Tsleep returned (signal?). * Go find out what the user wants. * adjust for data copied in but * not written */ uio->uio_resid += cc; return (error); } goto again; } (*linesw[tp->t_line].l_rint)(*cp++, tp); cnt++; cc--; } cc = 0; } return (0); } /* * Start output on pseudo-tty. * Wake up process selecting or sleeping for input from controlling tty. */ static void nmdmstart(tp) struct tty *tp; { register struct nm_softc *pti = tp->t_dev->si_drv1; if (tp->t_state & TS_TTSTOP) return; pti->pt_flags &= ~PF_STOPPED; wakeup_other(tp, FREAD); } /* Wakes up the OTHER tty;*/ static void wakeup_other(tp, flag) struct tty *tp; int flag; { struct softpart *ourpart, *otherpart; GETPARTS(tp, ourpart, otherpart); if (flag & FREAD) { selwakeup(&otherpart->nm_tty.t_rsel); wakeup(TSA_PTC_READ((&otherpart->nm_tty))); } if (flag & FWRITE) { selwakeup(&otherpart->nm_tty.t_wsel); wakeup(TSA_PTC_WRITE((&otherpart->nm_tty))); } } static void nmdmstop(tp, flush) register struct tty *tp; int flush; { struct nm_softc *pti = tp->t_dev->si_drv1; int flag; /* note: FLUSHREAD and FLUSHWRITE already ok */ if (flush == 0) { flush = TIOCPKT_STOP; pti->pt_flags |= PF_STOPPED; } else pti->pt_flags &= ~PF_STOPPED; /* change of perspective */ flag = 0; if (flush & FREAD) flag |= FWRITE; if (flush & FWRITE) flag |= FREAD; wakeup_other(tp, flag); } /*ARGSUSED*/ 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: 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; } static void nmdm_drvinit __P((void *unused)); static void nmdm_drvinit(unused) void *unused; { cdevsw_add(&nmdm_cdevsw); /* XXX: Gross hack for DEVFS */ nmdminit(0); } SYSINIT(nmdmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,nmdm_drvinit,NULL)