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freebsd-dev/sys/kern/tty.c
John Baldwin 39033470fe Close a race in the kern.ttys sysctl handler that resulted in panics in 
dev2udev() when a tty was being detached concurrently with the sysctl
handler:
- Hold the 'tty_list_mutex' lock while we read all the fields out of the
  struct tty for copying out later.  Previously the pty(4) and pts(4)
  destroy routines could set t_dev to NULL, drop their reference on the
  tty and destroy the cdev while the sysctl handler was attempting to
  invoke dev2udev() on the cdev being destroyed.  This happened when the
  sysctl handler read the value of t_dev prior to it being set to NULL
  either due to it being stale or due to timing races.  By holding the
  list lock we guarantee that the destroy routines will block in ttyrel()
  in that case and not destroy the cdev until after we've copied all of our
  data.  We may see a NULL cdev pointer or we may see the previous value,
  but the previous value will no longer point to a destroyed cdev if we
  see it.
- Fix the ttyfree() routine used by tty device drivers in their detach
  methods to use ttyrel() on the tty so we don't leak them.  Also, fix it
  to use the same order of operations as pty/pts destruction (set t_dev
  NULL, ttyrel(), destroy_dev()) so it cooperates with the sysctl handler.

MFC after:	3 days
Tested by:	avatar
2008-01-08 04:53:28 +00:00

3487 lines
80 KiB
C
Raw Blame History

/*-
* Copyright (c) 1982, 1986, 1990, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Copyright (c) 2002 Networks Associates Technologies, Inc.
* All rights reserved.
*
* Portions of this software were developed for the FreeBSD Project by
* ThinkSec AS and NAI Labs, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* 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.
* 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.
*
* @(#)tty.c 8.8 (Berkeley) 1/21/94
*/
/*-
* TODO:
* o Fix races for sending the start char in ttyflush().
* o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
* With luck, there will be MIN chars before select() returns().
* o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
* o Don't allow input in TS_ZOMBIE case. It would be visible through
* FIONREAD.
* o Do the new sio locking stuff here and use it to avoid special
* case for EXTPROC?
* o Lock PENDIN too?
* o Move EXTPROC and/or PENDIN to t_state?
* o Wrap most of ttioctl in spltty/splx.
* o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
* o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
* o Don't allow certain termios flags to affect disciplines other
* than TTYDISC. Cancel their effects before switch disciplines
* and ignore them if they are set while we are in another
* discipline.
* o Now that historical speed conversions are handled here, don't
* do them in drivers.
* o Check for TS_CARR_ON being set while everything is closed and not
* waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
* so it would live until the next open even if carrier drops.
* o Restore TS_WOPEN since it is useful in pstat. It must be cleared
* only when _all_ openers leave open().
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
#include "opt_tty.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filio.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/sx.h>
#if defined(COMPAT_43TTY)
#include <sys/ioctl_compat.h>
#endif
#include <sys/priv.h>
#include <sys/proc.h>
#define TTYDEFCHARS
#include <sys/tty.h>
#undef TTYDEFCHARS
#include <sys/fcntl.h>
#include <sys/conf.h>
#include <sys/poll.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/serial.h>
#include <sys/signalvar.h>
#include <sys/resourcevar.h>
#include <sys/malloc.h>
#include <sys/filedesc.h>
#include <sys/sched.h>
#include <sys/sysctl.h>
#include <sys/timepps.h>
#include <machine/stdarg.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
long tk_cancc;
long tk_nin;
long tk_nout;
long tk_rawcc;
static d_open_t ttysopen;
static d_close_t ttysclose;
static d_read_t ttysrdwr;
static d_ioctl_t ttysioctl;
static d_purge_t ttypurge;
/* Default cdevsw for common tty devices */
static struct cdevsw tty_cdevsw = {
.d_version = D_VERSION,
.d_open = ttyopen,
.d_close = ttyclose,
.d_ioctl = ttyioctl,
.d_purge = ttypurge,
.d_name = "ttydrv",
.d_flags = D_TTY | D_NEEDGIANT,
};
/* Cdevsw for slave tty devices */
static struct cdevsw ttys_cdevsw = {
.d_version = D_VERSION,
.d_open = ttysopen,
.d_close = ttysclose,
.d_read = ttysrdwr,
.d_write = ttysrdwr,
.d_ioctl = ttysioctl,
.d_name = "TTYS",
.d_flags = D_TTY | D_NEEDGIANT,
};
static int proc_sum(struct proc *, int *);
static int proc_compare(struct proc *, struct proc *);
static int thread_compare(struct thread *, struct thread *);
static int ttnread(struct tty *tp);
static void ttyecho(int c, struct tty *tp);
static int ttyoutput(int c, struct tty *tp);
static void ttypend(struct tty *tp);
static void ttyretype(struct tty *tp);
static void ttyrub(int c, struct tty *tp);
static void ttyrubo(struct tty *tp, int cnt);
static void ttyunblock(struct tty *tp);
static int ttywflush(struct tty *tp);
static int filt_ttyread(struct knote *kn, long hint);
static void filt_ttyrdetach(struct knote *kn);
static int filt_ttywrite(struct knote *kn, long hint);
static void filt_ttywdetach(struct knote *kn);
/*
* Table with character classes and parity. The 8th bit indicates parity,
* the 7th bit indicates the character is an alphameric or underscore (for
* ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
* are 0 then the character needs no special processing on output; classes
* other than 0 might be translated or (not currently) require delays.
*/
#define E 0x00 /* Even parity. */
#define O 0x80 /* Odd parity. */
#define PARITY(c) (char_type[c] & O)
#define ALPHA 0x40 /* Alpha or underscore. */
#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
#define CCLASSMASK 0x3f
#define CCLASS(c) (char_type[c] & CCLASSMASK)
#define BS BACKSPACE
#define CC CONTROL
#define CR RETURN
#define NA ORDINARY | ALPHA
#define NL NEWLINE
#define NO ORDINARY
#define TB TAB
#define VT VTAB
static u_char const char_type[] = {
E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
/*
* Meta chars; should be settable per character set;
* for now, treat them all as normal characters.
*/
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA, NA, NA, NA,
};
#undef BS
#undef CC
#undef CR
#undef NA
#undef NL
#undef NO
#undef TB
#undef VT
/* Macros to clear/set/test flags. */
#define SET(t, f) (t) |= (f)
#define CLR(t, f) (t) &= ~(f)
#define ISSET(t, f) ((t) & (f))
#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
/*
* list of struct tty where pstat(8) can pick it up with sysctl
*
* The lock order is to grab the list mutex before the tty mutex.
* Together with additions going on the tail of the list, this allows
* the sysctl to avoid doing retries.
*/
static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
static struct mtx tty_list_mutex;
MTX_SYSINIT(tty_list, &tty_list_mutex, "ttylist", MTX_DEF);
static struct unrhdr *tty_unit;
static int drainwait = 5*60;
SYSCTL_INT(_kern, OID_AUTO, drainwait, CTLFLAG_RW, &drainwait,
0, "Output drain timeout in seconds");
static struct tty *
tty_gettp(struct cdev *dev)
{
struct tty *tp;
struct cdevsw *csw;
csw = dev_refthread(dev);
KASSERT(csw != NULL, ("No cdevsw in ttycode (%s)", devtoname(dev)));
KASSERT(csw->d_flags & D_TTY,
("non D_TTY (%s) in tty code", devtoname(dev)));
dev_relthread(dev);
tp = dev->si_tty;
KASSERT(tp != NULL,
("no tty pointer on (%s) in tty code", devtoname(dev)));
return (tp);
}
/*
* Initial open of tty, or (re)entry to standard tty line discipline.
*/
int
tty_open(struct cdev *device, struct tty *tp)
{
int s;
s = spltty();
tp->t_dev = device;
tp->t_hotchar = 0;
if (!ISSET(tp->t_state, TS_ISOPEN)) {
ttyref(tp);
SET(tp->t_state, TS_ISOPEN);
if (ISSET(tp->t_cflag, CLOCAL))
SET(tp->t_state, TS_CONNECTED);
bzero(&tp->t_winsize, sizeof(tp->t_winsize));
}
/* XXX don't hang forever on output */
if (tp->t_timeout < 0)
tp->t_timeout = drainwait*hz;
ttsetwater(tp);
splx(s);
return (0);
}
/*
* Handle close() on a tty line: flush and set to initial state,
* bumping generation number so that pending read/write calls
* can detect recycling of the tty.
* XXX our caller should have done `spltty(); l_close(); tty_close();'
* and l_close() should have flushed, but we repeat the spltty() and
* the flush in case there are buggy callers.
*/
int
tty_close(struct tty *tp)
{
int ostate, s;
funsetown(&tp->t_sigio);
s = spltty();
if (constty == tp)
constty_clear();
ttyflush(tp, FREAD | FWRITE);
clist_free_cblocks(&tp->t_canq);
clist_free_cblocks(&tp->t_outq);
clist_free_cblocks(&tp->t_rawq);
tp->t_gen++;
tp->t_line = TTYDISC;
tp->t_hotchar = 0;
tp->t_pgrp = NULL;
tp->t_session = NULL;
ostate = tp->t_state;
tp->t_state = 0;
knlist_clear(&tp->t_rsel.si_note, 0);
knlist_clear(&tp->t_wsel.si_note, 0);
/*
* Both final close and revocation close might end up calling
* this method. Only the thread clearing TS_ISOPEN should
* release the reference to the tty.
*/
if (ISSET(ostate, TS_ISOPEN))
ttyrel(tp);
splx(s);
return (0);
}
#define FLUSHQ(q) { \
if ((q)->c_cc) \
ndflush(q, (q)->c_cc); \
}
/* Is 'c' a line delimiter ("break" character)? */
#define TTBREAKC(c, lflag) \
((c) == '\n' || (((c) == cc[VEOF] || \
(c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
(c) != _POSIX_VDISABLE))
/*
* Process input of a single character received on a tty.
*/
int
ttyinput(int c, struct tty *tp)
{
tcflag_t iflag, lflag;
cc_t *cc;
int i, err;
/*
* If input is pending take it first.
*/
lflag = tp->t_lflag;
if (ISSET(lflag, PENDIN))
ttypend(tp);
/*
* Gather stats.
*/
if (ISSET(lflag, ICANON)) {
++tk_cancc;
++tp->t_cancc;
} else {
++tk_rawcc;
++tp->t_rawcc;
}
++tk_nin;
/*
* Block further input iff:
* current input > threshold AND input is available to user program
* AND input flow control is enabled and not yet invoked.
* The 3 is slop for PARMRK.
*/
iflag = tp->t_iflag;
if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
(!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
(ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
!ISSET(tp->t_state, TS_TBLOCK))
ttyblock(tp);
/* Handle exceptional conditions (break, parity, framing). */
cc = tp->t_cc;
err = (ISSET(c, TTY_ERRORMASK));
if (err) {
CLR(c, TTY_ERRORMASK);
if (ISSET(err, TTY_BI)) {
if (ISSET(iflag, IGNBRK))
return (0);
if (ISSET(iflag, BRKINT)) {
ttyflush(tp, FREAD | FWRITE);
if (tp->t_pgrp != NULL) {
PGRP_LOCK(tp->t_pgrp);
pgsignal(tp->t_pgrp, SIGINT, 1);
PGRP_UNLOCK(tp->t_pgrp);
}
goto endcase;
}
if (ISSET(iflag, PARMRK))
goto parmrk;
} else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
|| ISSET(err, TTY_FE)) {
if (ISSET(iflag, IGNPAR))
return (0);
else if (ISSET(iflag, PARMRK)) {
parmrk:
if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
MAX_INPUT - 3)
goto input_overflow;
(void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
(void)putc(0 | TTY_QUOTE, &tp->t_rawq);
(void)putc(c | TTY_QUOTE, &tp->t_rawq);
goto endcase;
} else
c = 0;
}
}
if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
CLR(c, 0x80);
if (!ISSET(lflag, EXTPROC)) {
/*
* Check for literal nexting very first
*/
if (ISSET(tp->t_state, TS_LNCH)) {
SET(c, TTY_QUOTE);
CLR(tp->t_state, TS_LNCH);
}
/*
* Scan for special characters. This code
* is really just a big case statement with
* non-constant cases. The bottom of the
* case statement is labeled ``endcase'', so goto
* it after a case match, or similar.
*/
/*
* Control chars which aren't controlled
* by ICANON, ISIG, or IXON.
*/
if (ISSET(lflag, IEXTEN)) {
if (CCEQ(cc[VLNEXT], c)) {
if (ISSET(lflag, ECHO)) {
if (ISSET(lflag, ECHOE)) {
(void)ttyoutput('^', tp);
(void)ttyoutput('\b', tp);
} else
ttyecho(c, tp);
}
SET(tp->t_state, TS_LNCH);
goto endcase;
}
if (CCEQ(cc[VDISCARD], c)) {
if (ISSET(lflag, FLUSHO))
CLR(tp->t_lflag, FLUSHO);
else {
ttyflush(tp, FWRITE);
ttyecho(c, tp);
if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
ttyretype(tp);
SET(tp->t_lflag, FLUSHO);
}
goto startoutput;
}
}
/*
* Signals.
*/
if (ISSET(lflag, ISIG)) {
if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
if (!ISSET(lflag, NOFLSH))
ttyflush(tp, FREAD | FWRITE);
ttyecho(c, tp);
if (tp->t_pgrp != NULL) {
PGRP_LOCK(tp->t_pgrp);
pgsignal(tp->t_pgrp,
CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
PGRP_UNLOCK(tp->t_pgrp);
}
goto endcase;
}
if (CCEQ(cc[VSUSP], c)) {
if (!ISSET(lflag, NOFLSH))
ttyflush(tp, FREAD);
ttyecho(c, tp);
if (tp->t_pgrp != NULL) {
PGRP_LOCK(tp->t_pgrp);
pgsignal(tp->t_pgrp, SIGTSTP, 1);
PGRP_UNLOCK(tp->t_pgrp);
}
goto endcase;
}
}
/*
* Handle start/stop characters.
*/
if (ISSET(iflag, IXON)) {
if (CCEQ(cc[VSTOP], c)) {
if (!ISSET(tp->t_state, TS_TTSTOP)) {
SET(tp->t_state, TS_TTSTOP);
tt_stop(tp, 0);
return (0);
}
if (!CCEQ(cc[VSTART], c))
return (0);
/*
* if VSTART == VSTOP then toggle
*/
goto endcase;
}
if (CCEQ(cc[VSTART], c))
goto restartoutput;
}
/*
* IGNCR, ICRNL, & INLCR
*/
if (c == '\r') {
if (ISSET(iflag, IGNCR))
return (0);
else if (ISSET(iflag, ICRNL))
c = '\n';
} else if (c == '\n' && ISSET(iflag, INLCR))
c = '\r';
}
if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
/*
* From here on down canonical mode character
* processing takes place.
*/
/*
* erase or erase2 (^H / ^?)
*/
if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
if (tp->t_rawq.c_cc)
ttyrub(unputc(&tp->t_rawq), tp);
goto endcase;
}
/*
* kill (^U)
*/
if (CCEQ(cc[VKILL], c)) {
if (ISSET(lflag, ECHOKE) &&
tp->t_rawq.c_cc == tp->t_rocount &&
!ISSET(lflag, ECHOPRT))
while (tp->t_rawq.c_cc)
ttyrub(unputc(&tp->t_rawq), tp);
else {
ttyecho(c, tp);
if (ISSET(lflag, ECHOK) ||
ISSET(lflag, ECHOKE))
ttyecho('\n', tp);
FLUSHQ(&tp->t_rawq);
tp->t_rocount = 0;
}
CLR(tp->t_state, TS_LOCAL);
goto endcase;
}
/*
* word erase (^W)
*/
if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
int ctype;
/*
* erase whitespace
*/
while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
ttyrub(c, tp);
if (c == -1)
goto endcase;
/*
* erase last char of word and remember the
* next chars type (for ALTWERASE)
*/
ttyrub(c, tp);
c = unputc(&tp->t_rawq);
if (c == -1)
goto endcase;
if (c == ' ' || c == '\t') {
(void)putc(c, &tp->t_rawq);
goto endcase;
}
ctype = ISALPHA(c);
/*
* erase rest of word
*/
do {
ttyrub(c, tp);
c = unputc(&tp->t_rawq);
if (c == -1)
goto endcase;
} while (c != ' ' && c != '\t' &&
(!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
(void)putc(c, &tp->t_rawq);
goto endcase;
}
/*
* reprint line (^R)
*/
if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
ttyretype(tp);
goto endcase;
}
/*
* ^T - kernel info and generate SIGINFO
*/
if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
if (ISSET(lflag, ISIG) && tp->t_pgrp != NULL) {
PGRP_LOCK(tp->t_pgrp);
pgsignal(tp->t_pgrp, SIGINFO, 1);
PGRP_UNLOCK(tp->t_pgrp);
}
if (!ISSET(lflag, NOKERNINFO))
ttyinfo(tp);
goto endcase;
}
}
/*
* Check for input buffer overflow
*/
if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
input_overflow:
if (ISSET(iflag, IMAXBEL)) {
if (tp->t_outq.c_cc < tp->t_ohiwat)
(void)ttyoutput(CTRL('g'), tp);
}
goto endcase;
}
if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
&& ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
(void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
/*
* Put data char in q for user and
* wakeup on seeing a line delimiter.
*/
if (putc(c, &tp->t_rawq) >= 0) {
if (!ISSET(lflag, ICANON)) {
ttwakeup(tp);
ttyecho(c, tp);
goto endcase;
}
if (TTBREAKC(c, lflag)) {
tp->t_rocount = 0;
catq(&tp->t_rawq, &tp->t_canq);
ttwakeup(tp);
} else if (tp->t_rocount++ == 0)
tp->t_rocol = tp->t_column;
if (ISSET(tp->t_state, TS_ERASE)) {
/*
* end of prterase \.../
*/
CLR(tp->t_state, TS_ERASE);
(void)ttyoutput('/', tp);
}
i = tp->t_column;
ttyecho(c, tp);
if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
/*
* Place the cursor over the '^' of the ^D.
*/
i = imin(2, tp->t_column - i);
while (i > 0) {
(void)ttyoutput('\b', tp);
i--;
}
}
}
endcase:
/*
* IXANY means allow any character to restart output.
*/
if (ISSET(tp->t_state, TS_TTSTOP) &&
!ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
return (0);
restartoutput:
CLR(tp->t_lflag, FLUSHO);
CLR(tp->t_state, TS_TTSTOP);
startoutput:
return (ttstart(tp));
}
/*
* Output a single character on a tty, doing output processing
* as needed (expanding tabs, newline processing, etc.).
* Returns < 0 if succeeds, otherwise returns char to resend.
* Must be recursive.
*/
static int
ttyoutput(int c, struct tty *tp)
{
tcflag_t oflag;
int col, s;
oflag = tp->t_oflag;
if (!ISSET(oflag, OPOST)) {
if (ISSET(tp->t_lflag, FLUSHO))
return (-1);
if (putc(c, &tp->t_outq))
return (c);
tk_nout++;
tp->t_outcc++;
return (-1);
}
/*
* Do tab expansion if OXTABS is set. Special case if we external
* processing, we don't do the tab expansion because we'll probably
* get it wrong. If tab expansion needs to be done, let it happen
* externally.
*/
CLR(c, ~TTY_CHARMASK);
if (c == '\t' &&
ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
c = 8 - (tp->t_column & 7);
if (!ISSET(tp->t_lflag, FLUSHO)) {
s = spltty(); /* Don't interrupt tabs. */
c -= b_to_q(" ", c, &tp->t_outq);
tk_nout += c;
tp->t_outcc += c;
splx(s);
}
tp->t_column += c;
return (c ? -1 : '\t');
}
if (c == CEOT && ISSET(oflag, ONOEOT))
return (-1);
/*
* Newline translation: if ONLCR is set,
* translate newline into "\r\n".
*/
if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
tk_nout++;
tp->t_outcc++;
if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
return (c);
}
/* If OCRNL is set, translate "\r" into "\n". */
else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
c = '\n';
/* If ONOCR is set, don't transmit CRs when on column 0. */
else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
return (-1);
tk_nout++;
tp->t_outcc++;
if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
return (c);
col = tp->t_column;
switch (CCLASS(c)) {
case BACKSPACE:
if (col > 0)
--col;
break;
case CONTROL:
break;
case NEWLINE:
if (ISSET(tp->t_oflag, ONLCR | ONLRET))
col = 0;
break;
case RETURN:
col = 0;
break;
case ORDINARY:
++col;
break;
case TAB:
col = (col + 8) & ~7;
break;
}
tp->t_column = col;
return (-1);
}
/*
* Ioctls for all tty devices. Called after line-discipline specific ioctl
* has been called to do discipline-specific functions and/or reject any
* of these ioctl commands.
*/
/* ARGSUSED */
int
ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
{
struct proc *p;
struct thread *td;
struct pgrp *pgrp;
int s, error, bits, sig, sig2;
td = curthread; /* XXX */
p = td->td_proc;
/* If the ioctl involves modification, hang if in the background. */
switch (cmd) {
case TIOCCBRK:
case TIOCCONS:
case TIOCDRAIN:
case TIOCEXCL:
case TIOCFLUSH:
#ifdef TIOCHPCL
case TIOCHPCL:
#endif
case TIOCNXCL:
case TIOCSBRK:
case TIOCSCTTY:
case TIOCSDRAINWAIT:
case TIOCSETA:
case TIOCSETAF:
case TIOCSETAW:
case TIOCSETD:
case TIOCSPGRP:
case TIOCSTART:
case TIOCSTAT:
case TIOCSTI:
case TIOCSTOP:
case TIOCSWINSZ:
#if defined(COMPAT_43TTY)
case TIOCLBIC:
case TIOCLBIS:
case TIOCLSET:
case TIOCSETC:
case OTIOCSETD:
case TIOCSETN:
case TIOCSETP:
case TIOCSLTC:
#endif
sx_slock(&proctree_lock);
PROC_LOCK(p);
while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
!SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) &&
!SIGISMEMBER(td->td_sigmask, SIGTTOU)) {
pgrp = p->p_pgrp;
PROC_UNLOCK(p);
if (pgrp->pg_jobc == 0) {
sx_sunlock(&proctree_lock);
return (EIO);
}
PGRP_LOCK(pgrp);
sx_sunlock(&proctree_lock);
pgsignal(pgrp, SIGTTOU, 1);
PGRP_UNLOCK(pgrp);
error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
0);
if (error)
return (error);
sx_slock(&proctree_lock);
PROC_LOCK(p);
}
PROC_UNLOCK(p);
sx_sunlock(&proctree_lock);
break;
}
if (tp->t_modem != NULL) {
switch (cmd) {
case TIOCSDTR:
tt_modem(tp, SER_DTR, 0);
return (0);
case TIOCCDTR:
tt_modem(tp, 0, SER_DTR);
return (0);
case TIOCMSET:
bits = *(int *)data;
sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1;
sig2 = ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1;
tt_modem(tp, sig, sig2);
return (0);
case TIOCMBIS:
bits = *(int *)data;
sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1;
tt_modem(tp, sig, 0);
return (0);
case TIOCMBIC:
bits = *(int *)data;
sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1;
tt_modem(tp, 0, sig);
return (0);
case TIOCMGET:
sig = tt_modem(tp, 0, 0);
/* See <sys/serial.h. for the "<< 1" stuff */
bits = TIOCM_LE + (sig << 1);
*(int *)data = bits;
return (0);
default:
break;
}
}
if (tp->t_pps != NULL) {
error = pps_ioctl(cmd, data, tp->t_pps);
if (error != ENOIOCTL)
return (error);
}
switch (cmd) { /* Process the ioctl. */
case FIOASYNC: /* set/clear async i/o */
s = spltty();
if (*(int *)data)
SET(tp->t_state, TS_ASYNC);
else
CLR(tp->t_state, TS_ASYNC);
splx(s);
break;
case FIONBIO: /* set/clear non-blocking i/o */
break; /* XXX: delete. */
case FIONREAD: /* get # bytes to read */
s = spltty();
*(int *)data = ttnread(tp);
splx(s);
break;
case FIOSETOWN:
/*
* Policy -- Don't allow FIOSETOWN on someone else's
* controlling tty
*/
if (tp->t_session != NULL && !isctty(p, tp))
return (ENOTTY);
error = fsetown(*(int *)data, &tp->t_sigio);
if (error)
return (error);
break;
case FIOGETOWN:
if (tp->t_session != NULL && !isctty(p, tp))
return (ENOTTY);
*(int *)data = fgetown(&tp->t_sigio);
break;
case TIOCEXCL: /* set exclusive use of tty */
s = spltty();
SET(tp->t_state, TS_XCLUDE);
splx(s);
break;
case TIOCFLUSH: { /* flush buffers */
int flags = *(int *)data;
if (flags == 0)
flags = FREAD | FWRITE;
else
flags &= FREAD | FWRITE;
ttyflush(tp, flags);
break;
}
case TIOCCONS: /* become virtual console */
if (*(int *)data) {
struct nameidata nid;
if (constty && constty != tp &&
ISSET(constty->t_state, TS_CONNECTED))
return (EBUSY);
/* Ensure user can open the real console. */
NDINIT(&nid, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE,
"/dev/console", td);
if ((error = namei(&nid)) != 0)
return (error);
NDFREE(&nid, NDF_ONLY_PNBUF);
error = VOP_ACCESS(nid.ni_vp, VREAD, td->td_ucred, td);
vput(nid.ni_vp);
if (error)
return (error);
constty_set(tp);
} else if (tp == constty)
constty_clear();
break;
case TIOCDRAIN: /* wait till output drained */
error = ttywait(tp);
if (error)
return (error);
break;
case TIOCGETA: { /* get termios struct */
struct termios *t = (struct termios *)data;
bcopy(&tp->t_termios, t, sizeof(struct termios));
break;
}
case TIOCGETD: /* get line discipline */
*(int *)data = tp->t_line;
break;
case TIOCGWINSZ: /* get window size */
*(struct winsize *)data = tp->t_winsize;
break;
case TIOCGPGRP: /* get pgrp of tty */
if (!isctty(p, tp))
return (ENOTTY);
*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
break;
#ifdef TIOCHPCL
case TIOCHPCL: /* hang up on last close */
s = spltty();
SET(tp->t_cflag, HUPCL);
splx(s);
break;
#endif
case TIOCMGDTRWAIT:
*(int *)data = tp->t_dtr_wait * 100 / hz;
break;
case TIOCMSDTRWAIT:
/* must be root since the wait applies to following logins */
error = priv_check(td, PRIV_TTY_DTRWAIT);
if (error)
return (error);
tp->t_dtr_wait = *(int *)data * hz / 100;
break;
case TIOCNXCL: /* reset exclusive use of tty */
s = spltty();
CLR(tp->t_state, TS_XCLUDE);
splx(s);
break;
case TIOCOUTQ: /* output queue size */
*(int *)data = tp->t_outq.c_cc;
break;
case TIOCSETA: /* set termios struct */
case TIOCSETAW: /* drain output, set */
case TIOCSETAF: { /* drn out, fls in, set */
struct termios *t = (struct termios *)data;
if (t->c_ispeed == 0)
t->c_ispeed = t->c_ospeed;
if (t->c_ispeed == 0)
t->c_ispeed = tp->t_ospeed;
if (t->c_ispeed == 0)
return (EINVAL);
s = spltty();
if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
error = ttywait(tp);
if (error) {
splx(s);
return (error);
}
if (cmd == TIOCSETAF)
ttyflush(tp, FREAD);
}
if (!ISSET(t->c_cflag, CIGNORE)) {
/*
* Set device hardware.
*/
error = tt_param(tp, t);
if (error) {
splx(s);
return (error);
}
if (ISSET(t->c_cflag, CLOCAL) &&
!ISSET(tp->t_cflag, CLOCAL)) {
/*
* XXX disconnections would be too hard to
* get rid of without this kludge. The only
* way to get rid of controlling terminals
* is to exit from the session leader.
*/
CLR(tp->t_state, TS_ZOMBIE);
wakeup(TSA_CARR_ON(tp));
ttwakeup(tp);
ttwwakeup(tp);
}
if ((ISSET(tp->t_state, TS_CARR_ON) ||
ISSET(t->c_cflag, CLOCAL)) &&
!ISSET(tp->t_state, TS_ZOMBIE))
SET(tp->t_state, TS_CONNECTED);
else
CLR(tp->t_state, TS_CONNECTED);
tp->t_cflag = t->c_cflag;
tp->t_ispeed = t->c_ispeed;
if (t->c_ospeed != 0)
tp->t_ospeed = t->c_ospeed;
ttsetwater(tp);
}
if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
cmd != TIOCSETAF) {
if (ISSET(t->c_lflag, ICANON))
SET(tp->t_lflag, PENDIN);
else {
/*
* XXX we really shouldn't allow toggling
* ICANON while we're in a non-termios line
* discipline. Now we have to worry about
* panicing for a null queue.
*/
if (tp->t_canq.c_cbreserved > 0 &&
tp->t_rawq.c_cbreserved > 0) {
catq(&tp->t_rawq, &tp->t_canq);
/*
* XXX the queue limits may be
* different, so the old queue
* swapping method no longer works.
*/
catq(&tp->t_canq, &tp->t_rawq);
}
CLR(tp->t_lflag, PENDIN);
}
ttwakeup(tp);
}
tp->t_iflag = t->c_iflag;
tp->t_oflag = t->c_oflag;
/*
* Make the EXTPROC bit read only.
*/
if (ISSET(tp->t_lflag, EXTPROC))
SET(t->c_lflag, EXTPROC);
else
CLR(t->c_lflag, EXTPROC);
tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
t->c_cc[VTIME] != tp->t_cc[VTIME])
ttwakeup(tp);
bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
splx(s);
break;
}
case TIOCSETD: { /* set line discipline */
int t = *(int *)data;
if ((u_int)t >= nlinesw)
return (ENXIO);
if (t == tp->t_line)
return (0);
s = spltty();
ttyld_close(tp, flag);
tp->t_line = t;
/* XXX: we should use the correct cdev here */
error = ttyld_open(tp, tp->t_dev);
if (error) {
/*
* If we fail to switch line discipline we cannot
* fall back to the previous, because we can not
* trust that ldisc to open successfully either.
* Fall back to the default ldisc which we know
* will allways succeed.
*/
tp->t_line = TTYDISC;
(void)ttyld_open(tp, tp->t_dev);
}
splx(s);
return (error);
break;
}
case TIOCSTART: /* start output, like ^Q */
s = spltty();
if (ISSET(tp->t_state, TS_TTSTOP) ||
ISSET(tp->t_lflag, FLUSHO)) {
CLR(tp->t_lflag, FLUSHO);
CLR(tp->t_state, TS_TTSTOP);
ttstart(tp);
}
splx(s);
break;
case TIOCSTI: /* simulate terminal input */
if ((flag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI))
return (EPERM);
if (!isctty(p, tp) && priv_check(td, PRIV_TTY_STI))
return (EACCES);
s = spltty();
ttyld_rint(tp, *(u_char *)data);
splx(s);
break;
case TIOCSTOP: /* stop output, like ^S */
s = spltty();
if (!ISSET(tp->t_state, TS_TTSTOP)) {
SET(tp->t_state, TS_TTSTOP);
tt_stop(tp, 0);
}
splx(s);
break;
case TIOCSCTTY: /* become controlling tty */
/* Session ctty vnode pointer set in vnode layer. */
sx_slock(&proctree_lock);
if (!SESS_LEADER(p) ||
((p->p_session->s_ttyvp || tp->t_session) &&
(tp->t_session != p->p_session))) {
sx_sunlock(&proctree_lock);
return (EPERM);
}
tp->t_session = p->p_session;
tp->t_pgrp = p->p_pgrp;
SESS_LOCK(p->p_session);
ttyref(tp); /* ttyrel(): kern_proc.c:pgdelete() */
p->p_session->s_ttyp = tp;
SESS_UNLOCK(p->p_session);
PROC_LOCK(p);
p->p_flag |= P_CONTROLT;
PROC_UNLOCK(p);
sx_sunlock(&proctree_lock);
break;
case TIOCSPGRP: { /* set pgrp of tty */
sx_slock(&proctree_lock);
pgrp = pgfind(*(int *)data);
if (!isctty(p, tp)) {
if (pgrp != NULL)
PGRP_UNLOCK(pgrp);
sx_sunlock(&proctree_lock);
return (ENOTTY);
}
if (pgrp == NULL) {
sx_sunlock(&proctree_lock);
return (EPERM);
}
PGRP_UNLOCK(pgrp);
if (pgrp->pg_session != p->p_session) {
sx_sunlock(&proctree_lock);
return (EPERM);
}
sx_sunlock(&proctree_lock);
tp->t_pgrp = pgrp;
break;
}
case TIOCSTAT: /* simulate control-T */
s = spltty();
ttyinfo(tp);
splx(s);
break;
case TIOCSWINSZ: /* set window size */
if (bcmp((caddr_t)&tp->t_winsize, data,
sizeof (struct winsize))) {
tp->t_winsize = *(struct winsize *)data;
if (tp->t_pgrp != NULL) {
PGRP_LOCK(tp->t_pgrp);
pgsignal(tp->t_pgrp, SIGWINCH, 1);
PGRP_UNLOCK(tp->t_pgrp);
}
}
break;
case TIOCSDRAINWAIT:
error = priv_check(td, PRIV_TTY_DRAINWAIT);
if (error)
return (error);
tp->t_timeout = *(int *)data * hz;
wakeup(TSA_OCOMPLETE(tp));
wakeup(TSA_OLOWAT(tp));
break;
case TIOCGDRAINWAIT:
*(int *)data = tp->t_timeout / hz;
break;
case TIOCSBRK:
return (tt_break(tp, 1));
case TIOCCBRK:
return (tt_break(tp, 0));
default:
#if defined(COMPAT_43TTY)
return (ttcompat(tp, cmd, data, flag));
#else
return (ENOIOCTL);
#endif
}
return (0);
}
int
ttypoll(struct cdev *dev, int events, struct thread *td)
{
int s;
int revents = 0;
struct tty *tp;
tp = tty_gettp(dev);
if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
| POLLHUP);
s = spltty();
if (events & (POLLIN | POLLRDNORM)) {
if (ISSET(tp->t_state, TS_ZOMBIE))
revents |= (events & (POLLIN | POLLRDNORM)) |
POLLHUP;
else if (ttnread(tp) > 0)
revents |= events & (POLLIN | POLLRDNORM);
else
selrecord(td, &tp->t_rsel);
}
if (events & POLLOUT) {
if (ISSET(tp->t_state, TS_ZOMBIE))
revents |= POLLHUP;
else if (tp->t_outq.c_cc <= tp->t_olowat &&
ISSET(tp->t_state, TS_CONNECTED))
revents |= events & POLLOUT;
else
selrecord(td, &tp->t_wsel);
}
splx(s);
return (revents);
}
static struct filterops ttyread_filtops =
{ 1, NULL, filt_ttyrdetach, filt_ttyread };
static struct filterops ttywrite_filtops =
{ 1, NULL, filt_ttywdetach, filt_ttywrite };
int
ttykqfilter(struct cdev *dev, struct knote *kn)
{
struct tty *tp;
struct knlist *klist;
int s;
tp = tty_gettp(dev);
if (tp->t_state & TS_GONE)
return (ENODEV);
switch (kn->kn_filter) {
case EVFILT_READ:
klist = &tp->t_rsel.si_note;
kn->kn_fop = &ttyread_filtops;
break;
case EVFILT_WRITE:
klist = &tp->t_wsel.si_note;
kn->kn_fop = &ttywrite_filtops;
break;
default:
return (EINVAL);
}
kn->kn_hook = (caddr_t)tp;
s = spltty();
knlist_add(klist, kn, 0);
splx(s);
return (0);
}
static void
filt_ttyrdetach(struct knote *kn)
{
struct tty *tp = (struct tty *)kn->kn_hook;
int s = spltty();
knlist_remove(&tp->t_rsel.si_note, kn, 0);
splx(s);
}
static int
filt_ttyread(struct knote *kn, long hint)
{
struct tty *tp = (struct tty *)kn->kn_hook;
kn->kn_data = ttnread(tp);
if ((tp->t_state & TS_GONE) || ISSET(tp->t_state, TS_ZOMBIE)) {
kn->kn_flags |= EV_EOF;
return (1);
}
return (kn->kn_data > 0);
}
static void
filt_ttywdetach(struct knote *kn)
{
struct tty *tp = (struct tty *)kn->kn_hook;
int s = spltty();
knlist_remove(&tp->t_wsel.si_note, kn, 0);
splx(s);
}
static int
filt_ttywrite(struct knote *kn, long hint)
{
struct tty *tp = (struct tty *)kn->kn_hook;
kn->kn_data = tp->t_outq.c_cc;
if ((tp->t_state & TS_GONE) || ISSET(tp->t_state, TS_ZOMBIE))
return (1);
return (kn->kn_data <= tp->t_olowat &&
ISSET(tp->t_state, TS_CONNECTED));
}
/*
* Must be called at spltty().
*/
static int
ttnread(struct tty *tp)
{
int nread;
if (ISSET(tp->t_lflag, PENDIN))
ttypend(tp);
nread = tp->t_canq.c_cc;
if (!ISSET(tp->t_lflag, ICANON)) {
nread += tp->t_rawq.c_cc;
if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
nread = 0;
}
return (nread);
}
/*
* Wait for output to drain.
*/
int
ttywait(struct tty *tp)
{
int error, s;
error = 0;
s = spltty();
while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
tt_oproc(tp);
if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
ISSET(tp->t_state, TS_CONNECTED)) {
SET(tp->t_state, TS_SO_OCOMPLETE);
error = ttysleep(tp, TSA_OCOMPLETE(tp),
TTOPRI | PCATCH, "ttywai",
tp->t_timeout);
if (error) {
if (error == EWOULDBLOCK)
error = EIO;
break;
}
} else
break;
}
if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
error = EIO;
splx(s);
return (error);
}
/*
* Flush if successfully wait.
*/
static int
ttywflush(struct tty *tp)
{
int error;
if ((error = ttywait(tp)) == 0)
ttyflush(tp, FREAD);
return (error);
}
/*
* Flush tty read and/or write queues, notifying anyone waiting.
*/
void
ttyflush(struct tty *tp, int rw)
{
int s;
s = spltty();
#if 0
again:
#endif
if (rw & FWRITE) {
FLUSHQ(&tp->t_outq);
CLR(tp->t_state, TS_TTSTOP);
}
tt_stop(tp, rw);
if (rw & FREAD) {
FLUSHQ(&tp->t_canq);
FLUSHQ(&tp->t_rawq);
CLR(tp->t_lflag, PENDIN);
tp->t_rocount = 0;
tp->t_rocol = 0;
CLR(tp->t_state, TS_LOCAL);
ttwakeup(tp);
if (ISSET(tp->t_state, TS_TBLOCK)) {
if (rw & FWRITE)
FLUSHQ(&tp->t_outq);
ttyunblock(tp);
/*
* Don't let leave any state that might clobber the
* next line discipline (although we should do more
* to send the START char). Not clearing the state
* may have caused the "putc to a clist with no
* reserved cblocks" panic/printf.
*/
CLR(tp->t_state, TS_TBLOCK);
#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
if (ISSET(tp->t_iflag, IXOFF)) {
/*
* XXX wait a bit in the hope that the stop
* character (if any) will go out. Waiting
* isn't good since it allows races. This
* will be fixed when the stop character is
* put in a special queue. Don't bother with
* the checks in ttywait() since the timeout
* will save us.
*/
SET(tp->t_state, TS_SO_OCOMPLETE);
ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI,
"ttyfls", hz / 10);
/*
* Don't try sending the stop character again.
*/
CLR(tp->t_state, TS_TBLOCK);
goto again;
}
#endif
}
}
if (rw & FWRITE) {
FLUSHQ(&tp->t_outq);
ttwwakeup(tp);
}
splx(s);
}
/*
* Copy in the default termios characters.
*/
void
termioschars(struct termios *t)
{
bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
}
/*
* Old interface.
*/
void
ttychars(struct tty *tp)
{
termioschars(&tp->t_termios);
}
/*
* Handle input high water. Send stop character for the IXOFF case. Turn
* on our input flow control bit and propagate the changes to the driver.
* XXX the stop character should be put in a special high priority queue.
*/
void
ttyblock(struct tty *tp)
{
SET(tp->t_state, TS_TBLOCK);
if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
CLR(tp->t_state, TS_TBLOCK); /* try again later */
ttstart(tp);
}
/*
* Handle input low water. Send start character for the IXOFF case. Turn
* off our input flow control bit and propagate the changes to the driver.
* XXX the start character should be put in a special high priority queue.
*/
static void
ttyunblock(struct tty *tp)
{
CLR(tp->t_state, TS_TBLOCK);
if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
SET(tp->t_state, TS_TBLOCK); /* try again later */
ttstart(tp);
}
#ifdef notyet
/* Not used by any current (i386) drivers. */
/*
* Restart after an inter-char delay.
*/
void
ttrstrt(void *tp_arg)
{
struct tty *tp;
int s;
KASSERT(tp_arg != NULL, ("ttrstrt"));
tp = tp_arg;
s = spltty();
CLR(tp->t_state, TS_TIMEOUT);
ttstart(tp);
splx(s);
}
#endif
int
ttstart(struct tty *tp)
{
tt_oproc(tp);
return (0);
}
/*
* "close" a line discipline
*/
int
ttylclose(struct tty *tp, int flag)
{
if (flag & FNONBLOCK || ttywflush(tp))
ttyflush(tp, FREAD | FWRITE);
return (0);
}
/*
* Handle modem control transition on a tty.
* Flag indicates new state of carrier.
* Returns 0 if the line should be turned off, otherwise 1.
*/
int
ttymodem(struct tty *tp, int flag)
{
if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
/*
* MDMBUF: do flow control according to carrier flag
* XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
* works if IXON and IXANY are clear.
*/
if (flag) {
CLR(tp->t_state, TS_CAR_OFLOW);
CLR(tp->t_state, TS_TTSTOP);
ttstart(tp);
} else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
SET(tp->t_state, TS_CAR_OFLOW);
SET(tp->t_state, TS_TTSTOP);
tt_stop(tp, 0);
}
} else if (flag == 0) {
/*
* Lost carrier.
*/
CLR(tp->t_state, TS_CARR_ON);
if (ISSET(tp->t_state, TS_ISOPEN) &&
!ISSET(tp->t_cflag, CLOCAL)) {
SET(tp->t_state, TS_ZOMBIE);
CLR(tp->t_state, TS_CONNECTED);
if (tp->t_session) {
sx_slock(&proctree_lock);
if (tp->t_session && tp->t_session->s_leader) {
struct proc *p;
p = tp->t_session->s_leader;
PROC_LOCK(p);
psignal(p, SIGHUP);
PROC_UNLOCK(p);
}
sx_sunlock(&proctree_lock);
}
ttyflush(tp, FREAD | FWRITE);
return (0);
}
} else {
/*
* Carrier now on.
*/
SET(tp->t_state, TS_CARR_ON);
if (!ISSET(tp->t_state, TS_ZOMBIE))
SET(tp->t_state, TS_CONNECTED);
wakeup(TSA_CARR_ON(tp));
ttwakeup(tp);
ttwwakeup(tp);
}
return (1);
}
/*
* Reinput pending characters after state switch
* call at spltty().
*/
static void
ttypend(struct tty *tp)
{
struct clist tq;
int c;
CLR(tp->t_lflag, PENDIN);
SET(tp->t_state, TS_TYPEN);
/*
* XXX this assumes too much about clist internals. It may even
* fail if the cblock slush pool is empty. We can't allocate more
* cblocks here because we are called from an interrupt handler
* and clist_alloc_cblocks() can wait.
*/
tq = tp->t_rawq;
bzero(&tp->t_rawq, sizeof tp->t_rawq);
tp->t_rawq.c_cbmax = tq.c_cbmax;
tp->t_rawq.c_cbreserved = tq.c_cbreserved;
while ((c = getc(&tq)) >= 0)
ttyinput(c, tp);
CLR(tp->t_state, TS_TYPEN);
}
/*
* Process a read call on a tty device.
*/
int
ttread(struct tty *tp, struct uio *uio, int flag)
{
struct clist *qp;
int c;
tcflag_t lflag;
cc_t *cc = tp->t_cc;
struct thread *td;
struct proc *p;
int s, first, error = 0;
int has_stime = 0, last_cc = 0;
long slp = 0; /* XXX this should be renamed `timo'. */
struct timeval stime = { 0, 0 };
struct pgrp *pg;
td = curthread;
p = td->td_proc;
loop:
s = spltty();
lflag = tp->t_lflag;
/*
* take pending input first
*/
if (ISSET(lflag, PENDIN)) {
ttypend(tp);
splx(s); /* reduce latency */
s = spltty();
lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
}
/*
* Hang process if it's in the background.
*/
if (isbackground(p, tp)) {
splx(s);
sx_slock(&proctree_lock);
PROC_LOCK(p);
if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) ||
SIGISMEMBER(td->td_sigmask, SIGTTIN) ||
(p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) {
PROC_UNLOCK(p);
sx_sunlock(&proctree_lock);
return (EIO);
}
pg = p->p_pgrp;
PROC_UNLOCK(p);
PGRP_LOCK(pg);
sx_sunlock(&proctree_lock);
pgsignal(pg, SIGTTIN, 1);
PGRP_UNLOCK(pg);
error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
if (error)
return (error);
goto loop;
}
if (ISSET(tp->t_state, TS_ZOMBIE)) {
splx(s);
return (0); /* EOF */
}
/*
* If canonical, use the canonical queue,
* else use the raw queue.
*
* (should get rid of clists...)
*/
qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
if (flag & IO_NDELAY) {
if (qp->c_cc > 0)
goto read;
if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
splx(s);
return (0);
}
splx(s);
return (EWOULDBLOCK);
}
if (!ISSET(lflag, ICANON)) {
int m = cc[VMIN];
long t = cc[VTIME];
struct timeval timecopy;
/*
* Check each of the four combinations.
* (m > 0 && t == 0) is the normal read case.
* It should be fairly efficient, so we check that and its
* companion case (m == 0 && t == 0) first.
* For the other two cases, we compute the target sleep time
* into slp.
*/
if (t == 0) {
if (qp->c_cc < m)
goto sleep;
if (qp->c_cc > 0)
goto read;
/* m, t and qp->c_cc are all 0. 0 is enough input. */
splx(s);
return (0);
}
t *= 100000; /* time in us */
#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
((t1).tv_usec - (t2).tv_usec))
if (m > 0) {
if (qp->c_cc <= 0)
goto sleep;
if (qp->c_cc >= m)
goto read;
getmicrotime(&timecopy);
if (!has_stime) {
/* first character, start timer */
has_stime = 1;
stime = timecopy;
slp = t;
} else if (qp->c_cc > last_cc) {
/* got a character, restart timer */
stime = timecopy;
slp = t;
} else {
/* nothing, check expiration */
slp = t - diff(timecopy, stime);
if (slp <= 0)
goto read;
}
last_cc = qp->c_cc;
} else { /* m == 0 */
if (qp->c_cc > 0)
goto read;
getmicrotime(&timecopy);
if (!has_stime) {
has_stime = 1;
stime = timecopy;
slp = t;
} else {
slp = t - diff(timecopy, stime);
if (slp <= 0) {
/* Timed out, but 0 is enough input. */
splx(s);
return (0);
}
}
}
#undef diff
if (slp != 0) {
struct timeval tv; /* XXX style bug. */
tv.tv_sec = slp / 1000000;
tv.tv_usec = slp % 1000000;
slp = tvtohz(&tv);
/*
* XXX bad variable names. slp was the timeout in
* usec. Now it is the timeout in ticks.
*/
}
goto sleep;
}
if (qp->c_cc <= 0) {
sleep:
/*
* There is no input, or not enough input and we can block.
*/
error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH,
ISSET(tp->t_state, TS_CONNECTED) ?
"ttyin" : "ttyhup", (int)slp);
splx(s);
if (error == EWOULDBLOCK)
error = 0;
else if (error)
return (error);
/*
* XXX what happens if another process eats some input
* while we are asleep (not just here)? It would be
* safest to detect changes and reset our state variables
* (has_stime and last_cc).
*/
slp = 0;
goto loop;
}
read:
splx(s);
/*
* Input present, check for input mapping and processing.
*/
first = 1;
if (ISSET(lflag, ICANON | ISIG))
goto slowcase;
for (;;) {
char ibuf[IBUFSIZ];
int icc;
icc = imin(uio->uio_resid, IBUFSIZ);
icc = q_to_b(qp, ibuf, icc);
if (icc <= 0) {
if (first)
goto loop;
break;
}
error = uiomove(ibuf, icc, uio);
/*
* XXX if there was an error then we should ungetc() the
* unmoved chars and reduce icc here.
*/
if (error)
break;
if (uio->uio_resid == 0)
break;
first = 0;
}
goto out;
slowcase:
for (;;) {
c = getc(qp);
if (c < 0) {
if (first)
goto loop;
break;
}
/*
* delayed suspend (^Y)
*/
if (CCEQ(cc[VDSUSP], c) &&
ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
if (tp->t_pgrp != NULL) {
PGRP_LOCK(tp->t_pgrp);
pgsignal(tp->t_pgrp, SIGTSTP, 1);
PGRP_UNLOCK(tp->t_pgrp);
}
if (first) {
error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
"ttybg3", 0);
if (error)
break;
goto loop;
}
break;
}
/*
* Interpret EOF only in canonical mode.
*/
if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
break;
/*
* Give user character.
*/
error = ureadc(c, uio);
if (error)
/* XXX should ungetc(c, qp). */
break;
if (uio->uio_resid == 0)
break;
/*
* In canonical mode check for a "break character"
* marking the end of a "line of input".
*/
if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
break;
first = 0;
}
out:
/*
* Look to unblock input now that (presumably)
* the input queue has gone down.
*/
s = spltty();
if (ISSET(tp->t_state, TS_TBLOCK) &&
tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
ttyunblock(tp);
splx(s);
return (error);
}
/*
* Check the output queue on tp for space for a kernel message (from uprintf
* or tprintf). Allow some space over the normal hiwater mark so we don't
* lose messages due to normal flow control, but don't let the tty run amok.
* Sleeps here are not interruptible, but we return prematurely if new signals
* arrive.
*/
int
ttycheckoutq(struct tty *tp, int wait)
{
int hiwat, s;
sigset_t oldmask;
struct thread *td;
struct proc *p;
td = curthread;
p = td->td_proc;
hiwat = tp->t_ohiwat;
SIGEMPTYSET(oldmask);
s = spltty();
if (wait) {
PROC_LOCK(p);
oldmask = td->td_siglist;
PROC_UNLOCK(p);
}
if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
while (tp->t_outq.c_cc > hiwat) {
ttstart(tp);
if (tp->t_outq.c_cc <= hiwat)
break;
if (!wait) {
splx(s);
return (0);
}
PROC_LOCK(p);
if (!SIGSETEQ(td->td_siglist, oldmask)) {
PROC_UNLOCK(p);
splx(s);
return (0);
}
PROC_UNLOCK(p);
SET(tp->t_state, TS_SO_OLOWAT);
tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz);
}
splx(s);
return (1);
}
/*
* Process a write call on a tty device.
*/
int
ttwrite(struct tty *tp, struct uio *uio, int flag)
{
char *cp = NULL;
int cc, ce;
struct thread *td;
struct proc *p;
int i, hiwat, cnt, error, s;
char obuf[OBUFSIZ];
hiwat = tp->t_ohiwat;
cnt = uio->uio_resid;
error = 0;
cc = 0;
td = curthread;
p = td->td_proc;
loop:
s = spltty();
if (ISSET(tp->t_state, TS_ZOMBIE)) {
splx(s);
if (uio->uio_resid == cnt)
error = EIO;
goto out;
}
if (!ISSET(tp->t_state, TS_CONNECTED)) {
if (flag & IO_NDELAY) {
splx(s);
error = EWOULDBLOCK;
goto out;
}
error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
"ttywdcd", 0);
splx(s);
if (error)
goto out;
goto loop;
}
splx(s);
/*
* Hang the process if it's in the background.
*/
sx_slock(&proctree_lock);
PROC_LOCK(p);
if (isbackground(p, tp) &&
ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) &&
!SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) &&
!SIGISMEMBER(td->td_sigmask, SIGTTOU)) {
if (p->p_pgrp->pg_jobc == 0) {
PROC_UNLOCK(p);
sx_sunlock(&proctree_lock);
error = EIO;
goto out;
}
PROC_UNLOCK(p);
PGRP_LOCK(p->p_pgrp);
sx_sunlock(&proctree_lock);
pgsignal(p->p_pgrp, SIGTTOU, 1);
PGRP_UNLOCK(p->p_pgrp);
error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
if (error)
goto out;
goto loop;
} else {
PROC_UNLOCK(p);
sx_sunlock(&proctree_lock);
}
/*
* Process the user's data in at most OBUFSIZ chunks. Perform any
* output translation. Keep track of high water mark, sleep on
* overflow awaiting device aid in acquiring new space.
*/
while (uio->uio_resid > 0 || cc > 0) {
if (ISSET(tp->t_lflag, FLUSHO)) {
uio->uio_resid = 0;
return (0);
}
if (tp->t_outq.c_cc > hiwat)
goto ovhiwat;
/*
* Grab a hunk of data from the user, unless we have some
* leftover from last time.
*/
if (cc == 0) {
cc = imin(uio->uio_resid, OBUFSIZ);
cp = obuf;
error = uiomove(cp, cc, uio);
if (error) {
cc = 0;
break;
}
}
/*
* If nothing fancy need be done, grab those characters we
* can handle without any of ttyoutput's processing and
* just transfer them to the output q. For those chars
* which require special processing (as indicated by the
* bits in char_type), call ttyoutput. After processing
* a hunk of data, look for FLUSHO so ^O's will take effect
* immediately.
*/
while (cc > 0) {
if (!ISSET(tp->t_oflag, OPOST))
ce = cc;
else {
ce = cc - scanc((u_int)cc, (u_char *)cp,
char_type, CCLASSMASK);
/*
* If ce is zero, then we're processing
* a special character through ttyoutput.
*/
if (ce == 0) {
tp->t_rocount = 0;
if (ttyoutput(*cp, tp) >= 0) {
/* No Clists, wait a bit. */
ttstart(tp);
if (flag & IO_NDELAY) {
error = EWOULDBLOCK;
goto out;
}
error = ttysleep(tp, &lbolt,
TTOPRI|PCATCH,
"ttybf1", 0);
if (error)
goto out;
goto loop;
}
cp++;
cc--;
if (ISSET(tp->t_lflag, FLUSHO) ||
tp->t_outq.c_cc > hiwat)
goto ovhiwat;
continue;
}
}
/*
* A bunch of normal characters have been found.
* Transfer them en masse to the output queue and
* continue processing at the top of the loop.
* If there are any further characters in this
* <= OBUFSIZ chunk, the first should be a character
* requiring special handling by ttyoutput.
*/
tp->t_rocount = 0;
i = b_to_q(cp, ce, &tp->t_outq);
ce -= i;
tp->t_column += ce;
cp += ce, cc -= ce, tk_nout += ce;
tp->t_outcc += ce;
if (i > 0) {
/* No Clists, wait a bit. */
ttstart(tp);
if (flag & IO_NDELAY) {
error = EWOULDBLOCK;
goto out;
}
error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
"ttybf2", 0);
if (error)
goto out;
goto loop;
}
if (ISSET(tp->t_lflag, FLUSHO) ||
tp->t_outq.c_cc > hiwat)
break;
}
ttstart(tp);
}
out:
/*
* If cc is nonzero, we leave the uio structure inconsistent, as the
* offset and iov pointers have moved forward, but it doesn't matter
* (the call will either return short or restart with a new uio).
*/
uio->uio_resid += cc;
return (error);
ovhiwat:
ttstart(tp);
s = spltty();
/*
* This can only occur if FLUSHO is set in t_lflag,
* or if ttstart/oproc is synchronous (or very fast).
*/
if (tp->t_outq.c_cc <= hiwat) {
splx(s);
goto loop;
}
if (flag & IO_NDELAY) {
splx(s);
uio->uio_resid += cc;
return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
}
SET(tp->t_state, TS_SO_OLOWAT);
error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri",
tp->t_timeout);
splx(s);
if (error == EWOULDBLOCK)
error = EIO;
if (error)
goto out;
goto loop;
}
/*
* Rubout one character from the rawq of tp
* as cleanly as possible.
*/
static void
ttyrub(int c, struct tty *tp)
{
char *cp;
int savecol;
int tabc, s;
if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
return;
CLR(tp->t_lflag, FLUSHO);
if (ISSET(tp->t_lflag, ECHOE)) {
if (tp->t_rocount == 0) {
/*
* Screwed by ttwrite; retype
*/
ttyretype(tp);
return;
}
if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
ttyrubo(tp, 2);
else {
CLR(c, ~TTY_CHARMASK);
switch (CCLASS(c)) {
case ORDINARY:
ttyrubo(tp, 1);
break;
case BACKSPACE:
case CONTROL:
case NEWLINE:
case RETURN:
case VTAB:
if (ISSET(tp->t_lflag, ECHOCTL))
ttyrubo(tp, 2);
break;
case TAB:
if (tp->t_rocount < tp->t_rawq.c_cc) {
ttyretype(tp);
return;
}
s = spltty();
savecol = tp->t_column;
SET(tp->t_state, TS_CNTTB);
SET(tp->t_lflag, FLUSHO);
tp->t_column = tp->t_rocol;
cp = tp->t_rawq.c_cf;
if (cp)
tabc = *cp; /* XXX FIX NEXTC */
for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
ttyecho(tabc, tp);
CLR(tp->t_lflag, FLUSHO);
CLR(tp->t_state, TS_CNTTB);
splx(s);
/* savecol will now be length of the tab. */
savecol -= tp->t_column;
tp->t_column += savecol;
if (savecol > 8)
savecol = 8; /* overflow screw */
while (--savecol >= 0)
(void)ttyoutput('\b', tp);
break;
default: /* XXX */
#define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
(void)printf(PANICSTR, c, CCLASS(c));
#ifdef notdef
panic(PANICSTR, c, CCLASS(c));
#endif
}
}
} else if (ISSET(tp->t_lflag, ECHOPRT)) {
if (!ISSET(tp->t_state, TS_ERASE)) {
SET(tp->t_state, TS_ERASE);
(void)ttyoutput('\\', tp);
}
ttyecho(c, tp);
} else {
ttyecho(tp->t_cc[VERASE], tp);
/*
* This code may be executed not only when an ERASE key
* is pressed, but also when ^U (KILL) or ^W (WERASE) are.
* So, I didn't think it was worthwhile to pass the extra
* information (which would need an extra parameter,
* changing every call) needed to distinguish the ERASE2
* case from the ERASE.
*/
}
--tp->t_rocount;
}
/*
* Back over cnt characters, erasing them.
*/
static void
ttyrubo(struct tty *tp, int cnt)
{
while (cnt-- > 0) {
(void)ttyoutput('\b', tp);
(void)ttyoutput(' ', tp);
(void)ttyoutput('\b', tp);
}
}
/*
* ttyretype --
* Reprint the rawq line. Note, it is assumed that c_cc has already
* been checked.
*/
static void
ttyretype(struct tty *tp)
{
char *cp;
int s, c;
/* Echo the reprint character. */
if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
ttyecho(tp->t_cc[VREPRINT], tp);
(void)ttyoutput('\n', tp);
/*
* XXX
* FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
* BIT OF FIRST CHAR.
*/
s = spltty();
for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
ttyecho(c, tp);
for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
ttyecho(c, tp);
CLR(tp->t_state, TS_ERASE);
splx(s);
tp->t_rocount = tp->t_rawq.c_cc;
tp->t_rocol = 0;
}
/*
* Echo a typed character to the terminal.
*/
static void
ttyecho(int c, struct tty *tp)
{
if (!ISSET(tp->t_state, TS_CNTTB))
CLR(tp->t_lflag, FLUSHO);
if ((!ISSET(tp->t_lflag, ECHO) &&
(c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
ISSET(tp->t_lflag, EXTPROC))
return;
if (ISSET(tp->t_lflag, ECHOCTL) &&
((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
ISSET(c, TTY_CHARMASK) == 0177)) {
(void)ttyoutput('^', tp);
CLR(c, ~TTY_CHARMASK);
if (c == 0177)
c = '?';
else
c += 'A' - 1;
}
(void)ttyoutput(c, tp);
}
/*
* Wake up any readers on a tty.
*/
void
ttwakeup(struct tty *tp)
{
if (SEL_WAITING(&tp->t_rsel))
selwakeuppri(&tp->t_rsel, TTIPRI);
if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
wakeup(TSA_HUP_OR_INPUT(tp));
KNOTE_UNLOCKED(&tp->t_rsel.si_note, 0);
}
/*
* Wake up any writers on a tty.
*/
void
ttwwakeup(struct tty *tp)
{
if (SEL_WAITING(&tp->t_wsel) && tp->t_outq.c_cc <= tp->t_olowat)
selwakeuppri(&tp->t_wsel, TTOPRI);
if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
CLR(tp->t_state, TS_SO_OCOMPLETE);
wakeup(TSA_OCOMPLETE(tp));
}
if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
tp->t_outq.c_cc <= tp->t_olowat) {
CLR(tp->t_state, TS_SO_OLOWAT);
wakeup(TSA_OLOWAT(tp));
}
KNOTE_UNLOCKED(&tp->t_wsel.si_note, 0);
}
/*
* Look up a code for a specified speed in a conversion table;
* used by drivers to map software speed values to hardware parameters.
*/
int
ttspeedtab(int speed, struct speedtab *table)
{
for ( ; table->sp_speed != -1; table++)
if (table->sp_speed == speed)
return (table->sp_code);
return (-1);
}
/*
* Set input and output watermarks and buffer sizes. For input, the
* high watermark is about one second's worth of input above empty, the
* low watermark is slightly below high water, and the buffer size is a
* driver-dependent amount above high water. For output, the watermarks
* are near the ends of the buffer, with about 1 second's worth of input
* between them. All this only applies to the standard line discipline.
*/
void
ttsetwater(struct tty *tp)
{
int cps, ttmaxhiwat, x;
/* Input. */
clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
switch (tp->t_ispeedwat) {
case (speed_t)-1:
cps = tp->t_ispeed / 10;
break;
case 0:
/*
* This case is for old drivers that don't know about
* t_ispeedwat. Arrange for them to get the old buffer
* sizes and watermarks.
*/
cps = TTYHOG - 2 * 256;
tp->t_ififosize = 2 * 256;
break;
default:
cps = tp->t_ispeedwat / 10;
break;
}
tp->t_ihiwat = cps;
tp->t_ilowat = 7 * cps / 8;
x = cps + tp->t_ififosize;
clist_alloc_cblocks(&tp->t_rawq, x, x);
/* Output. */
switch (tp->t_ospeedwat) {
case (speed_t)-1:
cps = tp->t_ospeed / 10;
ttmaxhiwat = 2 * TTMAXHIWAT;
break;
case 0:
cps = tp->t_ospeed / 10;
ttmaxhiwat = TTMAXHIWAT;
break;
default:
cps = tp->t_ospeedwat / 10;
ttmaxhiwat = 8 * TTMAXHIWAT;
break;
}
#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
x += cps;
x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
x += OBUFSIZ + 100;
clist_alloc_cblocks(&tp->t_outq, x, x);
#undef CLAMP
}
/*
* Report on state of foreground process group.
*/
void
ttyinfo(struct tty *tp)
{
struct timeval utime, stime;
struct proc *p, *pick;
struct thread *td, *picktd;
const char *stateprefix, *state;
long rss;
int load, pctcpu;
pid_t pid;
char comm[MAXCOMLEN + 1];
struct rusage ru;
if (ttycheckoutq(tp,0) == 0)
return;
/* Print load average. */
load = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
ttyprintf(tp, "load: %d.%02d ", load / 100, load % 100);
/*
* On return following a ttyprintf(), we set tp->t_rocount to 0 so
* that pending input will be retyped on BS.
*/
if (tp->t_session == NULL) {
ttyprintf(tp, "not a controlling terminal\n");
tp->t_rocount = 0;
return;
}
if (tp->t_pgrp == NULL) {
ttyprintf(tp, "no foreground process group\n");
tp->t_rocount = 0;
return;
}
PGRP_LOCK(tp->t_pgrp);
if (LIST_EMPTY(&tp->t_pgrp->pg_members)) {
PGRP_UNLOCK(tp->t_pgrp);
ttyprintf(tp, "empty foreground process group\n");
tp->t_rocount = 0;
return;
}
/*
* Pick the most interesting process and copy some of its
* state for printing later. This operation could rely on stale
* data as we can't hold the proc slock or thread locks over the
* whole list. However, we're guaranteed not to reference an exited
* thread or proc since we hold the tty locked.
*/
pick = NULL;
LIST_FOREACH(p, &tp->t_pgrp->pg_members, p_pglist)
if (proc_compare(pick, p))
pick = p;
PROC_SLOCK(pick);
picktd = NULL;
td = FIRST_THREAD_IN_PROC(pick);
FOREACH_THREAD_IN_PROC(pick, td)
if (thread_compare(picktd, td))
picktd = td;
td = picktd;
stateprefix = "";
thread_lock(td);
if (TD_IS_RUNNING(td))
state = "running";
else if (TD_ON_RUNQ(td) || TD_CAN_RUN(td))
state = "runnable";
else if (TD_IS_SLEEPING(td)) {
/* XXX: If we're sleeping, are we ever not in a queue? */
if (TD_ON_SLEEPQ(td))
state = td->td_wmesg;
else
state = "sleeping without queue";
} else if (TD_ON_LOCK(td)) {
state = td->td_lockname;
stateprefix = "*";
} else if (TD_IS_SUSPENDED(td))
state = "suspended";
else if (TD_AWAITING_INTR(td))
state = "intrwait";
else
state = "unknown";
pctcpu = (sched_pctcpu(td) * 10000 + FSCALE / 2) >> FSHIFT;
thread_unlock(td);
if (pick->p_state == PRS_NEW || pick->p_state == PRS_ZOMBIE)
rss = 0;
else
rss = pgtok(vmspace_resident_count(pick->p_vmspace));
PROC_SUNLOCK(pick);
PROC_LOCK(pick);
PGRP_UNLOCK(tp->t_pgrp);
rufetchcalc(pick, &ru, &utime, &stime);
pid = pick->p_pid;
bcopy(pick->p_comm, comm, sizeof(comm));
PROC_UNLOCK(pick);
/* Print command, pid, state, utime, stime, %cpu, and rss. */
ttyprintf(tp,
" cmd: %s %d [%s%s] %ld.%02ldu %ld.%02lds %d%% %ldk\n",
comm, pid, stateprefix, state,
(long)utime.tv_sec, utime.tv_usec / 10000,
(long)stime.tv_sec, stime.tv_usec / 10000,
pctcpu / 100, rss);
tp->t_rocount = 0;
}
/*
* Returns 1 if p2 is "better" than p1
*
* The algorithm for picking the "interesting" process is thus:
*
* 1) Only foreground processes are eligible - implied.
* 2) Runnable processes are favored over anything else. The runner
* with the highest cpu utilization is picked (p_estcpu). Ties are
* broken by picking the highest pid.
* 3) The sleeper with the shortest sleep time is next. With ties,
* we pick out just "short-term" sleepers (P_SINTR == 0).
* 4) Further ties are broken by picking the highest pid.
*/
#define TESTAB(a, b) ((a)<<1 | (b))
#define ONLYA 2
#define ONLYB 1
#define BOTH 3
static int
proc_sum(struct proc *p, int *estcpup)
{
struct thread *td;
int estcpu;
int val;
val = 0;
estcpu = 0;
FOREACH_THREAD_IN_PROC(p, td) {
thread_lock(td);
if (TD_ON_RUNQ(td) ||
TD_IS_RUNNING(td))
val = 1;
estcpu += sched_pctcpu(td);
thread_unlock(td);
}
*estcpup = estcpu;
return (val);
}
static int
thread_compare(struct thread *td, struct thread *td2)
{
int runa, runb;
int slpa, slpb;
fixpt_t esta, estb;
if (td == NULL)
return (1);
/*
* Fetch running stats, pctcpu usage, and interruptable flag.
*/
thread_lock(td);
runa = TD_IS_RUNNING(td) | TD_ON_RUNQ(td);
slpa = td->td_flags & TDF_SINTR;
esta = sched_pctcpu(td);
thread_unlock(td);
thread_lock(td2);
runb = TD_IS_RUNNING(td2) | TD_ON_RUNQ(td2);
estb = sched_pctcpu(td2);
slpb = td2->td_flags & TDF_SINTR;
thread_unlock(td2);
/*
* see if at least one of them is runnable
*/
switch (TESTAB(runa, runb)) {
case ONLYA:
return (0);
case ONLYB:
return (1);
case BOTH:
break;
}
/*
* favor one with highest recent cpu utilization
*/
if (estb > esta)
return (1);
if (esta > estb)
return (0);
/*
* favor one sleeping in a non-interruptible sleep
*/
switch (TESTAB(slpa, slpb)) {
case ONLYA:
return (0);
case ONLYB:
return (1);
case BOTH:
break;
}
return (td < td2);
}
static int
proc_compare(struct proc *p1, struct proc *p2)
{
int runa, runb;
fixpt_t esta, estb;
if (p1 == NULL)
return (1);
/*
* Fetch various stats about these processes. After we drop the
* lock the information could be stale but the race is unimportant.
*/
PROC_SLOCK(p1);
runa = proc_sum(p1, &esta);
PROC_SUNLOCK(p1);
PROC_SLOCK(p2);
runb = proc_sum(p2, &estb);
PROC_SUNLOCK(p2);
/*
* see if at least one of them is runnable
*/
switch (TESTAB(runa, runb)) {
case ONLYA:
return (0);
case ONLYB:
return (1);
case BOTH:
break;
}
/*
* favor one with highest recent cpu utilization
*/
if (estb > esta)
return (1);
if (esta > estb)
return (0);
/*
* weed out zombies
*/
switch (TESTAB(p1->p_state == PRS_ZOMBIE, p2->p_state == PRS_ZOMBIE)) {
case ONLYA:
return (1);
case ONLYB:
return (0);
case BOTH:
break;
}
return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
}
/*
* Output char to tty; console putchar style.
*/
int
tputchar(int c, struct tty *tp)
{
int s;
s = spltty();
if (!ISSET(tp->t_state, TS_CONNECTED)) {
splx(s);
return (-1);
}
if (c == '\n')
(void)ttyoutput('\r', tp);
(void)ttyoutput(c, tp);
ttstart(tp);
splx(s);
return (0);
}
/*
* Sleep on chan, returning ERESTART if tty changed while we napped and
* returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
* the tty is revoked, restarting a pending call will redo validation done
* at the start of the call.
*/
int
ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo)
{
int error;
int gen;
gen = tp->t_gen;
error = tsleep(chan, pri, wmesg, timo);
if (tp->t_state & TS_GONE)
return (ENXIO);
if (error)
return (error);
return (tp->t_gen == gen ? 0 : ERESTART);
}
/*
* Gain a reference to a TTY
*/
int
ttyref(struct tty *tp)
{
int i;
mtx_lock(&tp->t_mtx);
KASSERT(tp->t_refcnt > 0,
("ttyref(): tty refcnt is %d (%s)",
tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??"));
i = ++tp->t_refcnt;
mtx_unlock(&tp->t_mtx);
return (i);
}
/*
* Drop a reference to a TTY.
* When reference count drops to zero, we free it.
*/
int
ttyrel(struct tty *tp)
{
int i;
mtx_lock(&tty_list_mutex);
mtx_lock(&tp->t_mtx);
KASSERT(tp->t_refcnt > 0,
("ttyrel(): tty refcnt is %d (%s)",
tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??"));
i = --tp->t_refcnt;
if (i != 0) {
mtx_unlock(&tp->t_mtx);
mtx_unlock(&tty_list_mutex);
return (i);
}
TAILQ_REMOVE(&tty_list, tp, t_list);
mtx_unlock(&tp->t_mtx);
mtx_unlock(&tty_list_mutex);
knlist_destroy(&tp->t_rsel.si_note);
knlist_destroy(&tp->t_wsel.si_note);
mtx_destroy(&tp->t_mtx);
free(tp, M_TTYS);
return (i);
}
/*
* Allocate a tty struct. Clists in the struct will be allocated by
* tty_open().
*/
struct tty *
ttyalloc()
{
struct tty *tp;
tp = malloc(sizeof *tp, M_TTYS, M_WAITOK | M_ZERO);
mtx_init(&tp->t_mtx, "tty", NULL, MTX_DEF);
/*
* Set up the initial state
*/
tp->t_refcnt = 1;
tp->t_timeout = -1;
tp->t_dtr_wait = 3 * hz;
ttyinitmode(tp, 0, 0);
bcopy(ttydefchars, tp->t_init_in.c_cc, sizeof tp->t_init_in.c_cc);
/* Make callout the same as callin */
tp->t_init_out = tp->t_init_in;
mtx_lock(&tty_list_mutex);
TAILQ_INSERT_TAIL(&tty_list, tp, t_list);
mtx_unlock(&tty_list_mutex);
knlist_init(&tp->t_rsel.si_note, &tp->t_mtx, NULL, NULL, NULL);
knlist_init(&tp->t_wsel.si_note, &tp->t_mtx, NULL, NULL, NULL);
return (tp);
}
static void
ttypurge(struct cdev *dev)
{
if (dev->si_tty == NULL)
return;
ttygone(dev->si_tty);
}
/*
* ttycreate()
*
* Create the device entries for this tty thereby opening it for business.
*
* The flags argument controls if "cua" units are created.
*
* The t_sc filed is copied to si_drv1 in the created cdevs. This
* is particularly important for ->t_cioctl() users.
*
* XXX: implement the init and lock devices by cloning.
*/
int
ttycreate(struct tty *tp, int flags, const char *fmt, ...)
{
char namebuf[SPECNAMELEN - 3]; /* XXX space for "tty" */
struct cdevsw *csw = NULL;
int unit = 0;
va_list ap;
struct cdev *cp;
int i, minor, sminor, sunit;
mtx_assert(&Giant, MA_OWNED);
if (tty_unit == NULL)
tty_unit = new_unrhdr(0, 0xffff, NULL);
sunit = alloc_unr(tty_unit);
tp->t_devunit = sunit;
if (csw == NULL) {
csw = &tty_cdevsw;
unit = sunit;
}
KASSERT(csw->d_purge == NULL || csw->d_purge == ttypurge,
("tty should not have d_purge"));
csw->d_purge = ttypurge;
minor = unit2minor(unit);
sminor = unit2minor(sunit);
va_start(ap, fmt);
i = vsnrprintf(namebuf, sizeof namebuf, 32, fmt, ap);
va_end(ap);
KASSERT(i < sizeof namebuf, ("Too long tty name (%s)", namebuf));
cp = make_dev(csw, minor,
UID_ROOT, GID_WHEEL, 0600, "tty%s", namebuf);
tp->t_dev = cp;
tp->t_mdev = cp;
cp->si_tty = tp;
cp->si_drv1 = tp->t_sc;
cp = make_dev(&ttys_cdevsw, sminor | MINOR_INIT,
UID_ROOT, GID_WHEEL, 0600, "tty%s.init", namebuf);
dev_depends(tp->t_dev, cp);
cp->si_drv1 = tp->t_sc;
cp->si_drv2 = &tp->t_init_in;
cp->si_tty = tp;
cp = make_dev(&ttys_cdevsw, sminor | MINOR_LOCK,
UID_ROOT, GID_WHEEL, 0600, "tty%s.lock", namebuf);
dev_depends(tp->t_dev, cp);
cp->si_drv1 = tp->t_sc;
cp->si_drv2 = &tp->t_lock_in;
cp->si_tty = tp;
if (flags & TS_CALLOUT) {
cp = make_dev(csw, minor | MINOR_CALLOUT,
UID_UUCP, GID_DIALER, 0660, "cua%s", namebuf);
dev_depends(tp->t_dev, cp);
cp->si_drv1 = tp->t_sc;
cp->si_tty = tp;
cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_INIT,
UID_UUCP, GID_DIALER, 0660, "cua%s.init", namebuf);
dev_depends(tp->t_dev, cp);
cp->si_drv1 = tp->t_sc;
cp->si_drv2 = &tp->t_init_out;
cp->si_tty = tp;
cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_LOCK,
UID_UUCP, GID_DIALER, 0660, "cua%s.lock", namebuf);
dev_depends(tp->t_dev, cp);
cp->si_drv1 = tp->t_sc;
cp->si_drv2 = &tp->t_lock_out;
cp->si_tty = tp;
}
return (0);
}
/*
* This function is called when the hardware disappears. We set a flag
* and wake up stuff so all sleeping threads will notice.
*/
void
ttygone(struct tty *tp)
{
tp->t_state |= TS_GONE;
if (SEL_WAITING(&tp->t_rsel))
selwakeuppri(&tp->t_rsel, TTIPRI);
if (SEL_WAITING(&tp->t_wsel))
selwakeuppri(&tp->t_wsel, TTOPRI);
if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL));
wakeup(&tp->t_dtr_wait);
wakeup(TSA_CARR_ON(tp));
wakeup(TSA_HUP_OR_INPUT(tp));
wakeup(TSA_OCOMPLETE(tp));
wakeup(TSA_OLOWAT(tp));
KNOTE_UNLOCKED(&tp->t_rsel.si_note, 0);
KNOTE_UNLOCKED(&tp->t_wsel.si_note, 0);
tt_purge(tp);
}
/*
* ttyfree()
*
* Called when the driver is ready to free the tty structure.
*
* XXX: This shall sleep until all threads have left the driver.
*/
void
ttyfree(struct tty *tp)
{
struct cdev *dev;
u_int unit;
mtx_assert(&Giant, MA_OWNED);
ttygone(tp);
unit = tp->t_devunit;
dev = tp->t_mdev;
tp->t_dev = NULL;
ttyrel(tp);
destroy_dev(dev);
free_unr(tty_unit, unit);
}
static int
sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
{
struct tty *tp, *tp2;
struct xtty xt;
int error;
error = 0;
mtx_lock(&tty_list_mutex);
tp = TAILQ_FIRST(&tty_list);
if (tp != NULL)
ttyref(tp);
while (tp != NULL) {
bzero(&xt, sizeof xt);
xt.xt_size = sizeof xt;
#define XT_COPY(field) xt.xt_##field = tp->t_##field
xt.xt_rawcc = tp->t_rawq.c_cc;
xt.xt_cancc = tp->t_canq.c_cc;
xt.xt_outcc = tp->t_outq.c_cc;
XT_COPY(line);
/*
* XXX: We hold the tty list lock while doing this to
* work around a race with pty/pts tty destruction.
* They set t_dev to NULL and then call ttyrel() to
* free the structure which will block on the list
* lock before they call destroy_dev() on the cdev
* backing t_dev.
*
* XXX: ttyfree() now does the same since it has been
* fixed to not leak ttys.
*/
if (tp->t_dev != NULL)
xt.xt_dev = dev2udev(tp->t_dev);
XT_COPY(state);
XT_COPY(flags);
XT_COPY(timeout);
if (tp->t_pgrp != NULL)
xt.xt_pgid = tp->t_pgrp->pg_id;
if (tp->t_session != NULL)
xt.xt_sid = tp->t_session->s_sid;
XT_COPY(termios);
XT_COPY(winsize);
XT_COPY(column);
XT_COPY(rocount);
XT_COPY(rocol);
XT_COPY(ififosize);
XT_COPY(ihiwat);
XT_COPY(ilowat);
XT_COPY(ispeedwat);
XT_COPY(ohiwat);
XT_COPY(olowat);
XT_COPY(ospeedwat);
#undef XT_COPY
mtx_unlock(&tty_list_mutex);
error = SYSCTL_OUT(req, &xt, sizeof xt);
if (error != 0) {
ttyrel(tp);
return (error);
}
mtx_lock(&tty_list_mutex);
tp2 = TAILQ_NEXT(tp, t_list);
if (tp2 != NULL)
ttyref(tp2);
mtx_unlock(&tty_list_mutex);
ttyrel(tp);
tp = tp2;
mtx_lock(&tty_list_mutex);
}
mtx_unlock(&tty_list_mutex);
return (0);
}
SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
0, 0, sysctl_kern_ttys, "S,xtty", "All ttys");
SYSCTL_LONG(_kern, OID_AUTO, tty_nin, CTLFLAG_RD,
&tk_nin, 0, "Total TTY in characters");
SYSCTL_LONG(_kern, OID_AUTO, tty_nout, CTLFLAG_RD,
&tk_nout, 0, "Total TTY out characters");
void
nottystop(struct tty *tp, int rw)
{
return;
}
int
ttyopen(struct cdev *dev, int flag, int mode, struct thread *td)
{
int error;
int s;
struct tty *tp;
tp = dev->si_tty;
s = spltty();
/*
* We jump to this label after all non-interrupted sleeps to pick
* up any changes of the device state.
*/
open_top:
if (tp->t_state & TS_GONE)
return (ENXIO);
error = ttydtrwaitsleep(tp);
if (error)
goto out;
if (tp->t_state & TS_ISOPEN) {
/*
* The device is open, so everything has been initialized.
* Handle conflicts.
*/
if (ISCALLOUT(dev) && !tp->t_actout)
return (EBUSY);
if (tp->t_actout && !ISCALLOUT(dev)) {
if (flag & O_NONBLOCK)
return (EBUSY);
error = tsleep(&tp->t_actout,
TTIPRI | PCATCH, "ttybi", 0);
if (error != 0 || (tp->t_flags & TS_GONE))
goto out;
goto open_top;
}
if (tp->t_state & TS_XCLUDE && priv_check(td,
PRIV_TTY_EXCLUSIVE))
return (EBUSY);
} else {
/*
* The device isn't open, so there are no conflicts.
* Initialize it. Initialization is done twice in many
* cases: to preempt sleeping callin opens if we are
* callout, and to complete a callin open after DCD rises.
*/
tp->t_termios = ISCALLOUT(dev) ? tp->t_init_out : tp->t_init_in;
tp->t_cflag = tp->t_termios.c_cflag;
if (tp->t_modem != NULL)
tt_modem(tp, SER_DTR | SER_RTS, 0);
++tp->t_wopeners;
error = tt_param(tp, &tp->t_termios);
--tp->t_wopeners;
if (error == 0)
error = tt_open(tp, dev);
if (error != 0)
goto out;
if (ISCALLOUT(dev) || (tt_modem(tp, 0, 0) & SER_DCD))
ttyld_modem(tp, 1);
}
/*
* Wait for DCD if necessary.
*/
if (!(tp->t_state & TS_CARR_ON) && !ISCALLOUT(dev)
&& !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) {
++tp->t_wopeners;
error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttydcd", 0);
--tp->t_wopeners;
if (error != 0 || (tp->t_state & TS_GONE))
goto out;
goto open_top;
}
error = ttyld_open(tp, dev);
ttyldoptim(tp);
if (tp->t_state & TS_ISOPEN && ISCALLOUT(dev))
tp->t_actout = TRUE;
out:
splx(s);
if (!(tp->t_state & TS_ISOPEN) && tp->t_wopeners == 0)
tt_close(tp);
return (error);
}
int
ttyclose(struct cdev *dev, int flag, int mode, struct thread *td)
{
struct tty *tp;
tp = dev->si_tty;
ttyld_close(tp, flag);
ttyldoptim(tp);
tt_close(tp);
tp->t_do_timestamp = 0;
if (tp->t_pps != NULL)
tp->t_pps->ppsparam.mode = 0;
tty_close(tp);
return (0);
}
int
ttyread(struct cdev *dev, struct uio *uio, int flag)
{
struct tty *tp;
tp = tty_gettp(dev);
if (tp->t_state & TS_GONE)
return (ENODEV);
return (ttyld_read(tp, uio, flag));
}
int
ttywrite(struct cdev *dev, struct uio *uio, int flag)
{
struct tty *tp;
tp = tty_gettp(dev);
if (tp->t_state & TS_GONE)
return (ENODEV);
return (ttyld_write(tp, uio, flag));
}
int
ttyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
{
struct tty *tp;
int error;
tp = dev->si_tty;
if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
int cc;
struct termios *dt = (struct termios *)data;
struct termios *lt =
ISCALLOUT(dev) ? &tp->t_lock_out : &tp->t_lock_in;
dt->c_iflag = (tp->t_iflag & lt->c_iflag)
| (dt->c_iflag & ~lt->c_iflag);
dt->c_oflag = (tp->t_oflag & lt->c_oflag)
| (dt->c_oflag & ~lt->c_oflag);
dt->c_cflag = (tp->t_cflag & lt->c_cflag)
| (dt->c_cflag & ~lt->c_cflag);
dt->c_lflag = (tp->t_lflag & lt->c_lflag)
| (dt->c_lflag & ~lt->c_lflag);
for (cc = 0; cc < NCCS; ++cc)
if (lt->c_cc[cc] != 0)
dt->c_cc[cc] = tp->t_cc[cc];
if (lt->c_ispeed != 0)
dt->c_ispeed = tp->t_ispeed;
if (lt->c_ospeed != 0)
dt->c_ospeed = tp->t_ospeed;
}
error = ttyld_ioctl(tp, cmd, data, flag, td);
if (error == ENOIOCTL)
error = ttioctl(tp, cmd, data, flag);
ttyldoptim(tp);
if (error != ENOIOCTL)
return (error);
return (ENOTTY);
}
void
ttyldoptim(struct tty *tp)
{
struct termios *t;
t = &tp->t_termios;
if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
&& (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
&& (!(t->c_iflag & PARMRK)
|| (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
&& !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
&& linesw[tp->t_line]->l_rint == ttyinput)
tp->t_state |= TS_CAN_BYPASS_L_RINT;
else
tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
}
static void
ttydtrwaitwakeup(void *arg)
{
struct tty *tp;
tp = arg;
tp->t_state &= ~TS_DTR_WAIT;
wakeup(&tp->t_dtr_wait);
}
void
ttydtrwaitstart(struct tty *tp)
{
if (tp->t_dtr_wait == 0)
return;
if (tp->t_state & TS_DTR_WAIT)
return;
timeout(ttydtrwaitwakeup, tp, tp->t_dtr_wait);
tp->t_state |= TS_DTR_WAIT;
}
int
ttydtrwaitsleep(struct tty *tp)
{
int error;
error = 0;
while (error == 0) {
if (tp->t_state & TS_GONE)
error = ENXIO;
else if (!(tp->t_state & TS_DTR_WAIT))
break;
else
error = tsleep(&tp->t_dtr_wait, TTIPRI | PCATCH,
"dtrwait", 0);
}
return (error);
}
static int
ttysopen(struct cdev *dev, int flag, int mode, struct thread *td)
{
struct tty *tp;
tp = dev->si_tty;
KASSERT(tp != NULL,
("ttysopen(): no tty pointer on device (%s)", devtoname(dev)));
if (tp->t_state & TS_GONE)
return (ENODEV);
return (0);
}
static int
ttysclose(struct cdev *dev, int flag, int mode, struct thread *td)
{
return (0);
}
static int
ttysrdwr(struct cdev *dev, struct uio *uio, int flag)
{
return (ENODEV);
}
static int
ttysioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
{
struct tty *tp;
int error;
struct termios *ct;
tp = dev->si_tty;
KASSERT(tp != NULL,
("ttysopen(): no tty pointer on device (%s)", devtoname(dev)));
if (tp->t_state & TS_GONE)
return (ENODEV);
ct = dev->si_drv2;
switch (cmd) {
case TIOCSETA:
error = priv_check(td, PRIV_TTY_SETA);
if (error != 0)
return (error);
*ct = *(struct termios *)data;
return (0);
case TIOCGETA:
*(struct termios *)data = *ct;
return (0);
case TIOCGETD:
*(int *)data = TTYDISC;
return (0);
case TIOCGWINSZ:
bzero(data, sizeof(struct winsize));
return (0);
default:
if (tp->t_cioctl != NULL)
return(tp->t_cioctl(dev, cmd, data, flag, td));
return (ENOTTY);
}
}
/*
* Initialize a tty to sane modes.
*/
void
ttyinitmode(struct tty *tp, int echo, int speed)
{
if (speed == 0)
speed = TTYDEF_SPEED;
tp->t_init_in.c_iflag = TTYDEF_IFLAG;
tp->t_init_in.c_oflag = TTYDEF_OFLAG;
tp->t_init_in.c_cflag = TTYDEF_CFLAG;
if (echo)
tp->t_init_in.c_lflag = TTYDEF_LFLAG_ECHO;
else
tp->t_init_in.c_lflag = TTYDEF_LFLAG_NOECHO;
tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = speed;
termioschars(&tp->t_init_in);
tp->t_init_out = tp->t_init_in;
tp->t_termios = tp->t_init_in;
}
/*
* Use more "normal" termios paramters for consoles.
*/
void
ttyconsolemode(struct tty *tp, int speed)
{
if (speed == 0)
speed = TTYDEF_SPEED;
ttyinitmode(tp, 1, speed);
tp->t_init_in.c_cflag |= CLOCAL;
tp->t_lock_out.c_cflag = tp->t_lock_in.c_cflag = CLOCAL;
tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed =
tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed = speed;
tp->t_init_out = tp->t_init_in;
tp->t_termios = tp->t_init_in;
ttsetwater(tp);
}
/*
* Record the relationship between the serial ports notion of modem control
* signals and the one used in certain ioctls in a way the compiler can enforce
* XXX: We should define TIOCM_* in terms of SER_ if we can limit the
* XXX: consequences of the #include work that would take.
*/
CTASSERT(SER_DTR == TIOCM_DTR / 2);
CTASSERT(SER_RTS == TIOCM_RTS / 2);
CTASSERT(SER_STX == TIOCM_ST / 2);
CTASSERT(SER_SRX == TIOCM_SR / 2);
CTASSERT(SER_CTS == TIOCM_CTS / 2);
CTASSERT(SER_DCD == TIOCM_DCD / 2);
CTASSERT(SER_RI == TIOCM_RI / 2);
CTASSERT(SER_DSR == TIOCM_DSR / 2);
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