NetBSD/sys/kern/tty_pty.c

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/* $NetBSD: tty_pty.c,v 1.43 2000/03/30 09:27:13 augustss Exp $ */
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/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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.
*
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* @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
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*/
/*
* Pseudo-teletype Driver
* (Actually two drivers, requiring two entries in 'cdevsw')
*/
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#include "opt_compat_sunos.h"
#include "pty.h" /* XXX */
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#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
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#include <sys/tty.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
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#include <sys/signalvar.h>
#include <sys/uio.h>
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#include <sys/conf.h>
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#include <sys/poll.h>
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#if NPTY == 1
#undef NPTY
#define NPTY 32 /* crude XXX */
#endif
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/* Macros to clear/set/test flags. */
#define SET(t, f) (t) |= (f)
#define CLR(t, f) (t) &= ~((unsigned)(f))
#define ISSET(t, f) ((t) & (f))
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#define BUFSIZ 100 /* Chunk size iomoved to/from user */
/*
* pts == /dev/tty[pqrs]?
* ptc == /dev/pty[pqrs]?
*/
struct pt_softc {
struct tty *pt_tty;
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int pt_flags;
struct selinfo pt_selr, pt_selw;
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u_char pt_send;
u_char pt_ucntl;
} pt_softc[NPTY]; /* XXX */
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int npty = NPTY; /* for pstat -t */
#define PF_PKT 0x08 /* packet mode */
#define PF_STOPPED 0x10 /* user told stopped */
#define PF_REMOTE 0x20 /* remote and flow controlled input */
#define PF_NOSTOP 0x40
#define PF_UCNTL 0x80 /* user control mode */
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void ptyattach __P((int));
void ptcwakeup __P((struct tty *, int));
struct tty *ptytty __P((dev_t));
void ptsstart __P((struct tty *));
/*
* Establish n (or default if n is 1) ptys in the system.
*/
void
ptyattach(n)
int n;
{
#ifdef notyet
#define DEFAULT_NPTY 32
/* maybe should allow 0 => none? */
if (n <= 1)
n = DEFAULT_NPTY;
pt_softc = malloc(n * sizeof(struct pt_softc), M_DEVBUF, M_WAITOK);
npty = n;
#endif
}
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/*ARGSUSED*/
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int
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ptsopen(dev, flag, devtype, p)
dev_t dev;
int flag, devtype;
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struct proc *p;
{
struct pt_softc *pti;
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struct tty *tp;
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int error;
if (minor(dev) >= npty)
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return (ENXIO);
pti = &pt_softc[minor(dev)];
if (!pti->pt_tty) {
tp = pti->pt_tty = ttymalloc();
tty_attach(tp);
}
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else
tp = pti->pt_tty;
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if (!ISSET(tp->t_state, TS_ISOPEN)) {
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ttychars(tp); /* Set up default chars */
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;
ttsetwater(tp); /* would be done in xxparam() */
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} else if (ISSET(tp->t_state, TS_XCLUDE) && p->p_ucred->cr_uid != 0)
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return (EBUSY);
if (tp->t_oproc) /* Ctrlr still around. */
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SET(tp->t_state, TS_CARR_ON);
if (!ISSET(flag, O_NONBLOCK))
while (!ISSET(tp->t_state, TS_CARR_ON)) {
tp->t_wopen++;
error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
ttopen, 0);
tp->t_wopen--;
if (error)
return (error);
}
error = (*linesw[tp->t_line].l_open)(dev, tp);
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ptcwakeup(tp, FREAD|FWRITE);
return (error);
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}
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int
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ptsclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
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struct pt_softc *pti = &pt_softc[minor(dev)];
struct tty *tp = pti->pt_tty;
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int error;
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error = (*linesw[tp->t_line].l_close)(tp, flag);
error |= ttyclose(tp);
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ptcwakeup(tp, FREAD|FWRITE);
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return (error);
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}
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int
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ptsread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
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{
struct proc *p = curproc;
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struct pt_softc *pti = &pt_softc[minor(dev)];
struct tty *tp = pti->pt_tty;
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int error = 0;
again:
if (pti->pt_flags & PF_REMOTE) {
while (isbackground(p, tp)) {
if (sigismember(&p->p_sigignore, SIGTTIN) ||
sigismember(&p->p_sigmask, SIGTTIN) ||
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p->p_pgrp->pg_jobc == 0 ||
p->p_flag & P_PPWAIT)
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return (EIO);
pgsignal(p->p_pgrp, SIGTTIN, 1);
error = ttysleep(tp, (caddr_t)&lbolt,
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TTIPRI | PCATCH, ttybg, 0);
if (error)
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return (error);
}
if (tp->t_canq.c_cc == 0) {
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if (flag & IO_NDELAY)
return (EWOULDBLOCK);
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error = ttysleep(tp, (caddr_t)&tp->t_canq,
TTIPRI | PCATCH, ttyin, 0);
if (error)
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return (error);
goto again;
}
while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
if (ureadc(getc(&tp->t_canq), uio) < 0) {
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error = EFAULT;
break;
}
if (tp->t_canq.c_cc == 1)
(void) getc(&tp->t_canq);
if (tp->t_canq.c_cc)
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return (error);
} else
if (tp->t_oproc)
error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
ptcwakeup(tp, FWRITE);
return (error);
}
/*
* Write to pseudo-tty.
* Wakeups of controlling tty will happen
* indirectly, when tty driver calls ptsstart.
*/
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int
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ptswrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
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{
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struct pt_softc *pti = &pt_softc[minor(dev)];
struct tty *tp = pti->pt_tty;
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if (tp->t_oproc == 0)
return (EIO);
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
/*
* Start output on pseudo-tty.
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* Wake up process polling or sleeping for input from controlling tty.
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*/
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void
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ptsstart(tp)
struct tty *tp;
{
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struct pt_softc *pti = &pt_softc[minor(tp->t_dev)];
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if (ISSET(tp->t_state, TS_TTSTOP))
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return;
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if (pti->pt_flags & PF_STOPPED) {
pti->pt_flags &= ~PF_STOPPED;
pti->pt_send = TIOCPKT_START;
}
ptcwakeup(tp, FREAD);
}
void
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ptsstop(tp, flush)
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struct tty *tp;
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int flush;
{
struct pt_softc *pti = &pt_softc[minor(tp->t_dev)];
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;
pti->pt_send |= flush;
/* change of perspective */
flag = 0;
if (flush & FREAD)
flag |= FWRITE;
if (flush & FWRITE)
flag |= FREAD;
ptcwakeup(tp, flag);
}
void
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ptcwakeup(tp, flag)
struct tty *tp;
int flag;
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{
struct pt_softc *pti = &pt_softc[minor(tp->t_dev)];
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if (flag & FREAD) {
selwakeup(&pti->pt_selr);
wakeup((caddr_t)&tp->t_outq.c_cf);
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}
if (flag & FWRITE) {
selwakeup(&pti->pt_selw);
wakeup((caddr_t)&tp->t_rawq.c_cf);
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}
}
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int ptcopen __P((dev_t, int, int, struct proc *));
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/*ARGSUSED*/
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int
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ptcopen(dev, flag, devtype, p)
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dev_t dev;
int flag, devtype;
struct proc *p;
{
struct pt_softc *pti;
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struct tty *tp;
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if (minor(dev) >= npty)
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return (ENXIO);
pti = &pt_softc[minor(dev)];
if (!pti->pt_tty) {
tp = pti->pt_tty = ttymalloc();
tty_attach(tp);
}
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else
tp = pti->pt_tty;
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if (tp->t_oproc)
return (EIO);
tp->t_oproc = ptsstart;
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
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CLR(tp->t_lflag, EXTPROC);
pti->pt_flags = 0;
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pti->pt_send = 0;
pti->pt_ucntl = 0;
return (0);
}
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/*ARGSUSED*/
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int
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ptcclose(dev, flag, devtype, p)
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dev_t dev;
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int flag, devtype;
struct proc *p;
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{
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struct pt_softc *pti = &pt_softc[minor(dev)];
struct tty *tp = pti->pt_tty;
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(void)(*linesw[tp->t_line].l_modem)(tp, 0);
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CLR(tp->t_state, TS_CARR_ON);
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tp->t_oproc = 0; /* mark closed */
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return (0);
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}
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int
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ptcread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
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{
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struct pt_softc *pti = &pt_softc[minor(dev)];
struct tty *tp = pti->pt_tty;
char buf[BUFSIZ];
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int error = 0, cc;
/*
* We want to block until the slave
* is open, and there's something to read;
* but if we lost the slave or we're NBIO,
* then return the appropriate error instead.
*/
for (;;) {
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if (ISSET(tp->t_state, TS_ISOPEN)) {
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if (pti->pt_flags&PF_PKT && pti->pt_send) {
error = ureadc((int)pti->pt_send, uio);
if (error)
return (error);
if (pti->pt_send & TIOCPKT_IOCTL) {
cc = min(uio->uio_resid,
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sizeof(tp->t_termios));
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uiomove((caddr_t) &tp->t_termios,
cc, uio);
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}
pti->pt_send = 0;
return (0);
}
if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
error = ureadc((int)pti->pt_ucntl, uio);
if (error)
return (error);
pti->pt_ucntl = 0;
return (0);
}
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if (tp->t_outq.c_cc && !ISSET(tp->t_state, TS_TTSTOP))
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break;
}
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if (!ISSET(tp->t_state, TS_CARR_ON))
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return (0); /* EOF */
if (flag & IO_NDELAY)
return (EWOULDBLOCK);
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error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH,
ttyin, 0);
if (error)
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return (error);
}
if (pti->pt_flags & (PF_PKT|PF_UCNTL))
error = ureadc(0, uio);
while (uio->uio_resid > 0 && error == 0) {
cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
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if (cc <= 0)
break;
error = uiomove(buf, cc, uio);
}
if (tp->t_outq.c_cc <= tp->t_lowat) {
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if (ISSET(tp->t_state, TS_ASLEEP)) {
CLR(tp->t_state, TS_ASLEEP);
wakeup((caddr_t)&tp->t_outq);
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}
selwakeup(&tp->t_wsel);
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}
return (error);
}
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int
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ptcwrite(dev, uio, flag)
dev_t dev;
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struct uio *uio;
int flag;
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{
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struct pt_softc *pti = &pt_softc[minor(dev)];
struct tty *tp = pti->pt_tty;
u_char *cp = NULL;
int cc = 0;
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u_char locbuf[BUFSIZ];
int cnt = 0;
int error = 0;
again:
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if (!ISSET(tp->t_state, TS_ISOPEN))
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goto block;
if (pti->pt_flags & PF_REMOTE) {
if (tp->t_canq.c_cc)
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goto block;
while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) {
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if (cc == 0) {
cc = min(uio->uio_resid, BUFSIZ);
cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
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cp = locbuf;
error = uiomove((caddr_t)cp, cc, uio);
if (error)
return (error);
/* check again for safety */
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if (!ISSET(tp->t_state, TS_ISOPEN))
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return (EIO);
}
if (cc)
(void) b_to_q((char *)cp, cc, &tp->t_canq);
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cc = 0;
}
(void) putc(0, &tp->t_canq);
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ttwakeup(tp);
wakeup((caddr_t)&tp->t_canq);
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return (0);
}
while (uio->uio_resid > 0) {
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 */
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if (!ISSET(tp->t_state, TS_ISOPEN))
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return (EIO);
}
while (cc > 0) {
if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
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(tp->t_canq.c_cc > 0 || !ISSET(tp->t_iflag, ICANON))) {
wakeup((caddr_t)&tp->t_rawq);
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goto block;
}
(*linesw[tp->t_line].l_rint)(*cp++, tp);
cnt++;
cc--;
}
cc = 0;
}
return (0);
block:
/*
* Come here to wait for slave to open, for space
* in outq, or space in rawq.
*/
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if (!ISSET(tp->t_state, TS_CARR_ON))
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return (EIO);
if (flag & IO_NDELAY) {
/* adjust for data copied in but not written */
uio->uio_resid += cc;
if (cnt == 0)
return (EWOULDBLOCK);
return (0);
}
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error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH,
ttyout, 0);
if (error) {
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/* adjust for data copied in but not written */
uio->uio_resid += cc;
return (error);
}
goto again;
}
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int
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ptcpoll(dev, events, p)
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dev_t dev;
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int events;
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struct proc *p;
{
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struct pt_softc *pti = &pt_softc[minor(dev)];
struct tty *tp = pti->pt_tty;
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int revents = 0;
int s = splsoftclock();
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if (events & (POLLIN | POLLRDNORM))
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if (ISSET(tp->t_state, TS_ISOPEN) &&
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((tp->t_outq.c_cc > 0 && !ISSET(tp->t_state, TS_TTSTOP)) ||
((pti->pt_flags & PF_PKT) && pti->pt_send) ||
((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
revents |= events & (POLLIN | POLLRDNORM);
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if (events & (POLLOUT | POLLWRNORM))
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if (ISSET(tp->t_state, TS_ISOPEN) &&
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((pti->pt_flags & PF_REMOTE) ?
(tp->t_canq.c_cc == 0) :
((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) ||
(tp->t_canq.c_cc == 0 && ISSET(tp->t_iflag, ICANON)))))
revents |= events & (POLLOUT | POLLWRNORM);
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if (events & POLLHUP)
if (!ISSET(tp->t_state, TS_CARR_ON))
revents |= POLLHUP;
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if (revents == 0) {
if (events & (POLLIN | POLLHUP | POLLRDNORM))
selrecord(p, &pti->pt_selr);
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if (events & (POLLOUT | POLLWRNORM))
selrecord(p, &pti->pt_selw);
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}
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splx(s);
return (revents);
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}
struct tty *
ptytty(dev)
dev_t dev;
{
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struct pt_softc *pti = &pt_softc[minor(dev)];
struct tty *tp = pti->pt_tty;
return (tp);
}
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/*ARGSUSED*/
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int
ptyioctl(dev, cmd, data, flag, p)
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dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
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{
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struct pt_softc *pti = &pt_softc[minor(dev)];
struct tty *tp = pti->pt_tty;
u_char *cc = tp->t_cc;
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int stop, error;
/*
* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
* ttywflush(tp) will hang if there are characters in the outq.
*/
if (cmd == TIOCEXT) {
/*
* When the EXTPROC bit is being toggled, we need
* to send an TIOCPKT_IOCTL if the packet driver
* is turned on.
*/
if (*(int *)data) {
if (pti->pt_flags & PF_PKT) {
pti->pt_send |= TIOCPKT_IOCTL;
ptcwakeup(tp, FREAD);
}
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SET(tp->t_lflag, EXTPROC);
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} else {
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if (ISSET(tp->t_lflag, EXTPROC) &&
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(pti->pt_flags & PF_PKT)) {
pti->pt_send |= TIOCPKT_IOCTL;
ptcwakeup(tp, FREAD);
}
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CLR(tp->t_lflag, EXTPROC);
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}
return(0);
} else
if (cdevsw[major(dev)].d_open == ptcopen)
switch (cmd) {
case TIOCGPGRP:
#ifdef COMPAT_SUNOS
{
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/*
* I'm not sure about SunOS TIOCGPGRP semantics
* on PTYs, but it's something like this:
*/
extern struct emul emul_sunos;
if (p->p_emul == &emul_sunos && tp->t_pgrp == 0)
return (EIO);
*(int *)data = tp->t_pgrp->pg_id;
return (0);
}
#endif
/*
* We avoid calling ttioctl on the controller since,
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* in that case, tp must be the controlling terminal.
*/
*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
return (0);
case TIOCPKT:
if (*(int *)data) {
if (pti->pt_flags & PF_UCNTL)
return (EINVAL);
pti->pt_flags |= PF_PKT;
} else
pti->pt_flags &= ~PF_PKT;
return (0);
case TIOCUCNTL:
if (*(int *)data) {
if (pti->pt_flags & PF_PKT)
return (EINVAL);
pti->pt_flags |= PF_UCNTL;
} else
pti->pt_flags &= ~PF_UCNTL;
return (0);
case TIOCREMOTE:
if (*(int *)data)
pti->pt_flags |= PF_REMOTE;
else
pti->pt_flags &= ~PF_REMOTE;
ttyflush(tp, FREAD|FWRITE);
return (0);
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#ifdef COMPAT_OLDTTY
case TIOCSETP:
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case TIOCSETN:
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#endif
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case TIOCSETD:
case TIOCSETA:
case TIOCSETAW:
case TIOCSETAF:
ndflush(&tp->t_outq, tp->t_outq.c_cc);
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break;
case TIOCSIG:
if (*(unsigned int *)data >= NSIG)
return(EINVAL);
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if (!ISSET(tp->t_lflag, NOFLSH))
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ttyflush(tp, FREAD|FWRITE);
pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
if ((*(unsigned int *)data == SIGINFO) &&
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(!ISSET(tp->t_lflag, NOKERNINFO)))
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ttyinfo(tp);
return(0);
}
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
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if (error < 0)
error = ttioctl(tp, cmd, data, flag, p);
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if (error < 0) {
if (pti->pt_flags & PF_UCNTL &&
(cmd & ~0xff) == UIOCCMD(0)) {
if (cmd & 0xff) {
pti->pt_ucntl = (u_char)cmd;
ptcwakeup(tp, FREAD);
}
return (0);
}
error = ENOTTY;
}
/*
* If external processing and packet mode send ioctl packet.
*/
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if (ISSET(tp->t_lflag, EXTPROC) && (pti->pt_flags & PF_PKT)) {
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switch(cmd) {
case TIOCSETA:
case TIOCSETAW:
case TIOCSETAF:
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#ifdef COMPAT_OLDTTY
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case TIOCSETP:
case TIOCSETN:
case TIOCSETC:
case TIOCSLTC:
case TIOCLBIS:
case TIOCLBIC:
case TIOCLSET:
#endif
pti->pt_send |= TIOCPKT_IOCTL;
ptcwakeup(tp, FREAD);
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default:
break;
}
}
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stop = ISSET(tp->t_iflag, IXON) && CCEQ(cc[VSTOP], CTRL('s'))
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&& CCEQ(cc[VSTART], CTRL('q'));
if (pti->pt_flags & PF_NOSTOP) {
if (stop) {
pti->pt_send &= ~TIOCPKT_NOSTOP;
pti->pt_send |= TIOCPKT_DOSTOP;
pti->pt_flags &= ~PF_NOSTOP;
ptcwakeup(tp, FREAD);
}
} else {
if (!stop) {
pti->pt_send &= ~TIOCPKT_DOSTOP;
pti->pt_send |= TIOCPKT_NOSTOP;
pti->pt_flags |= PF_NOSTOP;
ptcwakeup(tp, FREAD);
}
}
return (error);
}