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c0f99cc74a
NetBSD/sys/kern/tty.c
thorpej 8964c35eca Introduce a new process state distinct from SRUN called SONPROC 
which indicates that the process is actually running on a
processor.  Test against SONPROC as appropriate rather than
combinations of SRUN and curproc.  Update all context switch code
to properly set SONPROC when the process becomes the current
process on the CPU.
2000-05-26 00:36:42 +00:00

2215 lines
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/* $NetBSD: tty.c,v 1.119 2000/05/26 00:36:52 thorpej Exp $ */
/*-
* 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.
*
* 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.
*
* @(#)tty.c 8.13 (Berkeley) 1/9/95
*/
#include "opt_uconsole.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#define TTYDEFCHARS
#include <sys/tty.h>
#undef TTYDEFCHARS
#include <sys/file.h>
#include <sys/conf.h>
#include <sys/dkstat.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/signalvar.h>
#include <sys/resourcevar.h>
#include <sys/poll.h>
#include <vm/vm.h>
static int ttnread __P((struct tty *));
static void ttyblock __P((struct tty *));
static void ttyecho __P((int, struct tty *));
static void ttyrubo __P((struct tty *, int));
static int proc_compare __P((struct proc *, struct proc *));
/* Symbolic sleep message strings. */
const char ttclos[] = "ttycls";
const char ttopen[] = "ttyopn";
const char ttybg[] = "ttybg";
const char ttyin[] = "ttyin";
const char ttyout[] = "ttyout";
/*
* Used to determine whether we still have a connection. This is true in
* one of 3 cases:
* 1) We have carrier.
* 2) It's a locally attached terminal, and we are therefore ignoring carrier.
* 3) We're using a flow control mechanism that overloads the carrier signal.
*/
#define CONNECTED(tp) (ISSET(tp->t_state, TS_CARR_ON) || \
ISSET(tp->t_cflag, CLOCAL | MDMBUF))
/*
* 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
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) &= ~((unsigned)(f))
#define ISSET(t, f) ((t) & (f))
struct ttylist_head ttylist; /* TAILQ_HEAD */
int tty_count;
struct pool tty_pool;
int
ttyopen(tp, dialout, nonblock)
struct tty *tp;
int dialout, nonblock;
{
int s;
int error;
s = spltty();
if (dialout) {
/*
* If the device is already open for non-dialout, fail.
* Otherwise, set TS_DIALOUT to block any pending non-dialout
* opens.
*/
if (ISSET(tp->t_state, TS_ISOPEN) &&
!ISSET(tp->t_state, TS_DIALOUT)) {
splx(s);
return (EBUSY);
}
SET(tp->t_state, TS_DIALOUT);
} else {
if (!nonblock) {
/*
* Wait for carrier. Also wait for any dialout
* processes to close the tty first.
*/
while (ISSET(tp->t_state, TS_DIALOUT) ||
(!ISSET(tp->t_state, TS_CARR_ON) &&
!ISSET(tp->t_cflag, CLOCAL | MDMBUF))) {
tp->t_wopen++;
error = ttysleep(tp, &tp->t_rawq,
TTIPRI | PCATCH, ttopen, 0);
tp->t_wopen--;
if (error) {
splx(s);
return (error);
}
}
} else {
/*
* Don't allow a non-blocking non-dialout open if the
* device is already open for dialout.
*/
if (ISSET(tp->t_state, TS_DIALOUT)) {
splx(s);
return (EBUSY);
}
}
}
splx(s);
return (0);
}
/*
* Initial open of tty, or (re)entry to standard tty line discipline.
*/
int
ttylopen(device, tp)
dev_t device;
struct tty *tp;
{
int s;
s = spltty();
tp->t_dev = device;
if (!ISSET(tp->t_state, TS_ISOPEN)) {
SET(tp->t_state, TS_ISOPEN);
memset(&tp->t_winsize, 0, sizeof(tp->t_winsize));
#ifdef COMPAT_OLDTTY
tp->t_flags = 0;
#endif
}
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.
*/
int
ttyclose(tp)
struct tty *tp;
{
extern struct tty *constty; /* Temporary virtual console. */
if (constty == tp)
constty = NULL;
ttyflush(tp, FREAD | FWRITE);
tp->t_gen++;
tp->t_pgrp = NULL;
tp->t_session = NULL;
tp->t_state = 0;
return (0);
}
#define FLUSHQ(q) { \
if ((q)->c_cc) \
ndflush(q, (q)->c_cc); \
}
/*
* This macro is used in canonical mode input processing, where a read
* request shall not return unless a 'line delimiter' ('\n') or 'break'
* (EOF, EOL, EOL2) character (or a signal) has been received. As EOL2
* is an extension to the POSIX.1 defined set of special characters,
* recognize it only if IEXTEN is set in the set of local flags.
*/
#define TTBREAKC(c, lflg) \
((c) == '\n' || (((c) == cc[VEOF] || (c) == cc[VEOL] || \
((c) == cc[VEOL2] && ISSET(lflg, IEXTEN))) && (c) != _POSIX_VDISABLE))
/*
* Process input of a single character received on a tty.
*/
int
ttyinput(c, tp)
int c;
struct tty *tp;
{
int iflag, lflag;
u_char *cc;
int i, error;
/*
* Unless the receiver is enabled, drop incoming data.
*/
if (!ISSET(tp->t_cflag, CREAD))
return (0);
/*
* 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;
cc = tp->t_cc;
/*
* Handle exceptional conditions (break, parity, framing).
*/
iflag = tp->t_iflag;
if ((error = (ISSET(c, TTY_ERRORMASK))) != 0) {
CLR(c, TTY_ERRORMASK);
if (ISSET(error, TTY_FE) && c == 0) { /* Break. */
if (ISSET(iflag, IGNBRK))
return (0);
else if (ISSET(iflag, BRKINT)) {
ttyflush(tp, FREAD | FWRITE);
pgsignal(tp->t_pgrp, SIGINT, 1);
return (0);
}
else if (ISSET(iflag, PARMRK))
goto parmrk;
}
else if ((ISSET(error, TTY_PE) && ISSET(iflag, INPCK)) ||
ISSET(error, TTY_FE)) {
if (ISSET(iflag, IGNPAR))
return (0);
else if (ISSET(iflag, PARMRK)) {
parmrk: (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
(void)putc(0 | TTY_QUOTE, &tp->t_rawq);
(void)putc(c | TTY_QUOTE, &tp->t_rawq);
return (0);
}
else
c = 0;
}
}
else if (c == 0377 &&
ISSET(iflag, ISTRIP|IGNPAR|INPCK|PARMRK) == (INPCK|PARMRK)) {
/* "Escape" a valid character of '\377'. */
(void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
(void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
goto endcase;
}
/*
* In tandem mode, check high water mark.
*/
if (ISSET(iflag, IXOFF) || ISSET(tp->t_cflag, CHWFLOW))
ttyblock(tp);
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);
pgsignal(tp->t_pgrp,
CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
goto endcase;
}
if (CCEQ(cc[VSUSP], c)) {
if (!ISSET(lflag, NOFLSH))
ttyflush(tp, FREAD);
ttyecho(c, tp);
pgsignal(tp->t_pgrp, SIGTSTP, 1);
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);
(*cdevsw[major(tp->t_dev)].d_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))
goto endcase;
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 (^H / ^?)
*/
if (CCEQ(cc[VERASE], 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;
}
/*
* Extensions to the POSIX.1 GTI set of functions.
*/
if (ISSET(lflag, IEXTEN)) {
/*
* word erase (^W)
*/
if (CCEQ(cc[VWERASE], c)) {
int alt = ISSET(lflag, ALTWERASE);
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' &&
(alt == 0 || ISALPHA(c) == ctype));
(void)putc(c, &tp->t_rawq);
goto endcase;
}
/*
* reprint line (^R)
*/
if (CCEQ(cc[VREPRINT], c)) {
ttyretype(tp);
goto endcase;
}
/*
* ^T - kernel info and generate SIGINFO
*/
if (CCEQ(cc[VSTATUS], c)) {
if (ISSET(lflag, ISIG))
pgsignal(tp->t_pgrp, SIGINFO, 1);
if (!ISSET(lflag, NOKERNINFO))
ttyinfo(tp);
goto endcase;
}
}
}
/*
* Check for input buffer overflow
*/
if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= TTYHOG) {
if (ISSET(iflag, IMAXBEL)) {
if (tp->t_outq.c_cc < tp->t_hiwat)
(void)ttyoutput(CTRL('g'), tp);
} else
ttyflush(tp, FREAD | FWRITE);
goto endcase;
}
/*
* 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 = min(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.
*/
int
ttyoutput(c, tp)
int c;
struct tty *tp;
{
long oflag;
int col, notout, s;
oflag = tp->t_oflag;
if (!ISSET(oflag, OPOST)) {
tk_nout++;
tp->t_outcc++;
if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
return (c);
return (-1);
}
/*
* Do tab expansion if OXTABS is set. Special case if we do 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)) {
notout = 0;
} else {
s = spltty(); /* Don't interrupt tabs. */
notout = b_to_q(" ", c, &tp->t_outq);
c -= notout;
tk_nout += c;
tp->t_outcc += c;
splx(s);
}
tp->t_column += c;
return (notout ? '\t' : -1);
}
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(tp, cmd, data, flag, p)
struct tty *tp;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
extern struct tty *constty; /* Temporary virtual console. */
extern int nlinesw;
int s, error;
/* If the ioctl involves modification, hang if in the background. */
switch (cmd) {
case TIOCFLUSH:
case TIOCDRAIN:
case TIOCSBRK:
case TIOCCBRK:
case TIOCSTART:
case TIOCSETA:
case TIOCSETD:
case TIOCSETAF:
case TIOCSETAW:
#ifdef notdef
case TIOCSPGRP:
#endif
case TIOCSTAT:
case TIOCSTI:
case TIOCSWINSZ:
#ifdef COMPAT_OLDTTY
case TIOCLBIC:
case TIOCLBIS:
case TIOCLSET:
case TIOCSETC:
case OTIOCSETD:
case TIOCSETN:
case TIOCSETP:
case TIOCSLTC:
#endif
while (isbackground(curproc, tp) &&
p->p_pgrp->pg_jobc && (p->p_flag & P_PPWAIT) == 0 &&
!sigismember(&p->p_sigignore, SIGTTOU) &&
!sigismember(&p->p_sigmask, SIGTTOU)) {
pgsignal(p->p_pgrp, SIGTTOU, 1);
error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, ttybg, 0);
if (error)
return (error);
}
break;
}
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 */
*(int *)data = ttnread(tp);
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) {
if (constty && constty != tp &&
ISSET(constty->t_state, TS_CARR_ON | TS_ISOPEN) ==
(TS_CARR_ON | TS_ISOPEN))
return (EBUSY);
#ifndef UCONSOLE
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return (error);
#endif
constty = tp;
} else if (tp == constty)
constty = NULL;
break;
case TIOCDRAIN: /* wait till output drained */
if ((error = ttywait(tp)) != 0)
return (error);
break;
case TIOCGETA: { /* get termios struct */
struct termios *t = (struct termios *)data;
memcpy(t, &tp->t_termios, 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;
case TIOCGSID: /* get sid of tty */
if (!isctty(p, tp))
return (ENOTTY);
*(int *)data = tp->t_session->s_sid;
break;
#ifdef TIOCHPCL
case TIOCHPCL: /* hang up on last close */
s = spltty();
SET(tp->t_cflag, HUPCL);
splx(s);
break;
#endif
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;
s = spltty();
if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
if ((error = ttywait(tp)) != 0) {
splx(s);
return (error);
}
if (cmd == TIOCSETAF)
ttyflush(tp, FREAD);
}
if (!ISSET(t->c_cflag, CIGNORE)) {
/*
* Set device hardware.
*/
if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
splx(s);
return (error);
} else {
tp->t_cflag = t->c_cflag;
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
if (t->c_ospeed == 0 && tp->t_session &&
tp->t_session->s_leader)
psignal(tp->t_session->s_leader,
SIGHUP);
}
ttsetwater(tp);
}
if (cmd != TIOCSETAF) {
if (ISSET(t->c_lflag, ICANON) !=
ISSET(tp->t_lflag, ICANON)) {
if (ISSET(t->c_lflag, ICANON)) {
SET(tp->t_lflag, PENDIN);
ttwakeup(tp);
} else {
struct clist tq;
catq(&tp->t_rawq, &tp->t_canq);
tq = tp->t_rawq;
tp->t_rawq = tp->t_canq;
tp->t_canq = tq;
CLR(tp->t_lflag, PENDIN);
}
}
}
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);
memcpy(tp->t_cc, t->c_cc, sizeof(t->c_cc));
splx(s);
break;
}
case TIOCSETD: { /* set line discipline */
int t = *(int *)data;
dev_t device = tp->t_dev;
if ((u_int)t >= nlinesw)
return (ENXIO);
if (t != tp->t_line) {
s = spltty();
(*linesw[tp->t_line].l_close)(tp, flag);
error = (*linesw[t].l_open)(device, tp);
if (error) {
(void)(*linesw[tp->t_line].l_open)(device, tp);
splx(s);
return (error);
}
tp->t_line = t;
splx(s);
}
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 (p->p_ucred->cr_uid && (flag & FREAD) == 0)
return (EPERM);
if (p->p_ucred->cr_uid && !isctty(p, tp))
return (EACCES);
(*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
break;
case TIOCSTOP: /* stop output, like ^S */
s = spltty();
if (!ISSET(tp->t_state, TS_TTSTOP)) {
SET(tp->t_state, TS_TTSTOP);
(*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
}
splx(s);
break;
case TIOCSCTTY: /* become controlling tty */
/* Session ctty vnode pointer set in vnode layer. */
if (!SESS_LEADER(p) ||
((p->p_session->s_ttyvp || tp->t_session) &&
(tp->t_session != p->p_session)))
return (EPERM);
tp->t_session = p->p_session;
tp->t_pgrp = p->p_pgrp;
p->p_session->s_ttyp = tp;
p->p_flag |= P_CONTROLT;
break;
case TIOCSPGRP: { /* set pgrp of tty */
struct pgrp *pgrp = pgfind(*(int *)data);
if (!isctty(p, tp))
return (ENOTTY);
else if (pgrp == NULL)
return (EINVAL);
else if (pgrp->pg_session != p->p_session)
return (EPERM);
tp->t_pgrp = pgrp;
break;
}
case TIOCSTAT: /* get load avg stats */
ttyinfo(tp);
break;
case TIOCSWINSZ: /* set window size */
if (memcmp((caddr_t)&tp->t_winsize, data,
sizeof(struct winsize))) {
tp->t_winsize = *(struct winsize *)data;
pgsignal(tp->t_pgrp, SIGWINCH, 1);
}
break;
default:
#ifdef COMPAT_OLDTTY
return (ttcompat(tp, cmd, data, flag, p));
#else
return (-1);
#endif
}
return (0);
}
int
ttpoll(dev, events, p)
dev_t dev;
int events;
struct proc *p;
{
struct tty *tp = (*cdevsw[major(dev)].d_tty)(dev);
int revents = 0;
int s = spltty();
if (events & (POLLIN | POLLRDNORM))
if (ttnread(tp) > 0)
revents |= events & (POLLIN | POLLRDNORM);
if (events & (POLLOUT | POLLWRNORM))
if (tp->t_outq.c_cc <= tp->t_lowat)
revents |= events & (POLLOUT | POLLWRNORM);
if (events & POLLHUP)
if (!CONNECTED(tp))
revents |= POLLHUP;
if (revents == 0) {
if (events & (POLLIN | POLLHUP | POLLRDNORM))
selrecord(p, &tp->t_rsel);
if (events & (POLLOUT | POLLWRNORM))
selrecord(p, &tp->t_wsel);
}
splx(s);
return (revents);
}
static int
ttnread(tp)
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])
nread = 0;
}
return (nread);
}
/*
* Wait for output to drain.
*/
int
ttywait(tp)
struct tty *tp;
{
int error, s;
error = 0;
s = spltty();
while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
CONNECTED(tp) && tp->t_oproc) {
(*tp->t_oproc)(tp);
SET(tp->t_state, TS_ASLEEP);
error = ttysleep(tp, &tp->t_outq, TTOPRI | PCATCH, ttyout, 0);
if (error)
break;
}
splx(s);
return (error);
}
/*
* Flush if successfully wait.
*/
int
ttywflush(tp)
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(tp, rw)
struct tty *tp;
int rw;
{
int s;
s = spltty();
if (rw & FREAD) {
FLUSHQ(&tp->t_canq);
FLUSHQ(&tp->t_rawq);
tp->t_rocount = 0;
tp->t_rocol = 0;
CLR(tp->t_state, TS_LOCAL);
ttwakeup(tp);
}
if (rw & FWRITE) {
CLR(tp->t_state, TS_TTSTOP);
(*cdevsw[major(tp->t_dev)].d_stop)(tp, rw);
FLUSHQ(&tp->t_outq);
wakeup((caddr_t)&tp->t_outq);
selwakeup(&tp->t_wsel);
}
splx(s);
}
/*
* Copy in the default termios characters.
*/
void
ttychars(tp)
struct tty *tp;
{
memcpy(tp->t_cc, ttydefchars, sizeof(ttydefchars));
}
/*
* Send stop character on input overflow.
*/
static void
ttyblock(tp)
struct tty *tp;
{
int total;
total = tp->t_rawq.c_cc + tp->t_canq.c_cc;
if (tp->t_rawq.c_cc > TTYHOG) {
ttyflush(tp, FREAD | FWRITE);
CLR(tp->t_state, TS_TBLOCK);
}
/*
* Block further input iff: current input > threshold
* AND input is available to user program.
*/
if (total >= TTYHOG / 2 &&
!ISSET(tp->t_state, TS_TBLOCK) &&
(!ISSET(tp->t_lflag, ICANON) || tp->t_canq.c_cc > 0)) {
if (ISSET(tp->t_iflag, IXOFF) &&
tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) {
SET(tp->t_state, TS_TBLOCK);
ttstart(tp);
}
/* Try to block remote output via hardware flow control. */
if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow &&
(*tp->t_hwiflow)(tp, 1) != 0)
SET(tp->t_state, TS_TBLOCK);
}
}
void
ttrstrt(tp_arg)
void *tp_arg;
{
struct tty *tp;
int s;
#ifdef DIAGNOSTIC
if (tp_arg == NULL)
panic("ttrstrt");
#endif
tp = tp_arg;
s = spltty();
CLR(tp->t_state, TS_TIMEOUT);
ttstart(tp);
splx(s);
}
int
ttstart(tp)
struct tty *tp;
{
if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
(*tp->t_oproc)(tp);
return (0);
}
/*
* "close" a line discipline
*/
int
ttylclose(tp, flag)
struct tty *tp;
int flag;
{
if (flag & FNONBLOCK)
ttyflush(tp, FREAD | FWRITE);
else
ttywflush(tp);
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(tp, flag)
struct tty *tp;
int flag;
{
if (flag == 0) {
if (ISSET(tp->t_state, TS_CARR_ON)) {
/*
* Lost carrier.
*/
CLR(tp->t_state, TS_CARR_ON);
if (ISSET(tp->t_state, TS_ISOPEN) && !CONNECTED(tp)) {
if (tp->t_session && tp->t_session->s_leader)
psignal(tp->t_session->s_leader, SIGHUP);
ttyflush(tp, FREAD | FWRITE);
return (0);
}
}
} else {
if (!ISSET(tp->t_state, TS_CARR_ON)) {
/*
* Carrier now on.
*/
SET(tp->t_state, TS_CARR_ON);
ttwakeup(tp);
}
}
return (1);
}
/*
* Default modem control routine (for other line disciplines).
* Return argument flag, to turn off device on carrier drop.
*/
int
nullmodem(tp, flag)
struct tty *tp;
int flag;
{
if (flag)
SET(tp->t_state, TS_CARR_ON);
else {
CLR(tp->t_state, TS_CARR_ON);
if (!CONNECTED(tp)) {
if (tp->t_session && tp->t_session->s_leader)
psignal(tp->t_session->s_leader, SIGHUP);
return (0);
}
}
return (1);
}
/*
* Reinput pending characters after state switch
* call at spltty().
*/
void
ttypend(tp)
struct tty *tp;
{
struct clist tq;
int c;
CLR(tp->t_lflag, PENDIN);
SET(tp->t_state, TS_TYPEN);
tq = tp->t_rawq;
tp->t_rawq.c_cc = 0;
tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0;
while ((c = getc(&tq)) >= 0)
ttyinput(c, tp);
CLR(tp->t_state, TS_TYPEN);
}
/*
* Process a read call on a tty device.
*/
int
ttread(tp, uio, flag)
struct tty *tp;
struct uio *uio;
int flag;
{
struct clist *qp;
int c;
long lflag;
u_char *cc = tp->t_cc;
struct proc *p = curproc;
int s, first, error = 0;
struct timeval stime;
int has_stime = 0, last_cc = 0;
long slp = 0;
loop: lflag = tp->t_lflag;
s = spltty();
/*
* take pending input first
*/
if (ISSET(lflag, PENDIN))
ttypend(tp);
splx(s);
/*
* Hang process if it's in the background.
*/
if (isbackground(p, tp)) {
if (sigismember(&p->p_sigignore, SIGTTIN) ||
sigismember(&p->p_sigmask, SIGTTIN) ||
p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0)
return (EIO);
pgsignal(p->p_pgrp, SIGTTIN, 1);
error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, ttybg, 0);
if (error)
return (error);
goto loop;
}
s = spltty();
if (!ISSET(lflag, ICANON)) {
int m = cc[VMIN];
long t = cc[VTIME];
qp = &tp->t_rawq;
/*
* 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;
goto read;
}
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;
if (!has_stime) {
/* first character, start timer */
has_stime = 1;
stime = time;
slp = t;
} else if (qp->c_cc > last_cc) {
/* got a character, restart timer */
stime = time;
slp = t;
} else {
/* nothing, check expiration */
slp = t - diff(time, stime);
}
} else { /* m == 0 */
if (qp->c_cc > 0)
goto read;
if (!has_stime) {
has_stime = 1;
stime = time;
slp = t;
} else
slp = t - diff(time, stime);
}
last_cc = qp->c_cc;
#undef diff
if (slp > 0) {
/*
* Rounding down may make us wake up just short
* of the target, so we round up.
* The formula is ceiling(slp * hz/1000000).
* 32-bit arithmetic is enough for hz < 169.
*
* Also, use plain wakeup() not ttwakeup().
*/
slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
goto sleep;
}
} else if ((qp = &tp->t_canq)->c_cc <= 0) {
int carrier;
sleep:
/*
* If there is no input, sleep on rawq
* awaiting hardware receipt and notification.
* If we have data, we don't need to check for carrier.
*/
carrier = CONNECTED(tp);
if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) {
splx(s);
return (0); /* EOF */
}
if (flag & IO_NDELAY) {
splx(s);
return (EWOULDBLOCK);
}
error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
carrier ? ttyin : ttopen, slp);
splx(s);
/* VMIN == 0: any quantity read satisfies */
if (cc[VMIN] == 0 && error == EWOULDBLOCK)
return (0);
if (error && error != EWOULDBLOCK)
return (error);
goto loop;
}
read:
splx(s);
/*
* Input present, check for input mapping and processing.
*/
first = 1;
while ((c = getc(qp)) >= 0) {
/*
* delayed suspend (^Y)
*/
if (CCEQ(cc[VDSUSP], c) &&
ISSET(lflag, IEXTEN|ISIG) == (IEXTEN|ISIG)) {
pgsignal(tp->t_pgrp, SIGTSTP, 1);
if (first) {
error = ttysleep(tp, &lbolt,
TTIPRI | PCATCH, ttybg, 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)
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;
}
/*
* Look to unblock output now that (presumably)
* the input queue has gone down.
*/
s = spltty();
if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG/5) {
if (ISSET(tp->t_iflag, IXOFF) &&
cc[VSTART] != _POSIX_VDISABLE &&
putc(cc[VSTART], &tp->t_outq) == 0) {
CLR(tp->t_state, TS_TBLOCK);
ttstart(tp);
}
/* Try to unblock remote output via hardware flow control. */
if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow &&
(*tp->t_hwiflow)(tp, 0) != 0)
CLR(tp->t_state, TS_TBLOCK);
}
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(tp, wait)
struct tty *tp;
int wait;
{
int hiwat, s;
int error;
hiwat = tp->t_hiwat;
s = spltty();
if (tp->t_outq.c_cc > hiwat + 200)
while (tp->t_outq.c_cc > hiwat) {
ttstart(tp);
if (wait == 0) {
splx(s);
return (0);
}
callout_reset(&tp->t_outq_ch, hz,
(void (*)__P((void *)))wakeup, &tp->t_outq);
SET(tp->t_state, TS_ASLEEP);
error = tsleep(&tp->t_outq, (PZERO - 1) | PCATCH,
"ttckoutq", 0);
if (error == EINTR)
wait = 0;
}
splx(s);
return (1);
}
/*
* Process a write call on a tty device.
*/
int
ttwrite(tp, uio, flag)
struct tty *tp;
struct uio *uio;
int flag;
{
u_char *cp = NULL;
int cc, ce;
struct proc *p;
int i, hiwat, cnt, error, s;
u_char obuf[OBUFSIZ];
hiwat = tp->t_hiwat;
cnt = uio->uio_resid;
error = 0;
cc = 0;
loop:
s = spltty();
if (!CONNECTED(tp)) {
if (ISSET(tp->t_state, TS_ISOPEN)) {
splx(s);
return (EIO);
} else if (flag & IO_NDELAY) {
splx(s);
error = EWOULDBLOCK;
goto out;
} else {
/* Sleep awaiting carrier. */
error = ttysleep(tp,
&tp->t_rawq, TTIPRI | PCATCH, ttopen, 0);
splx(s);
if (error)
goto out;
goto loop;
}
}
splx(s);
/*
* Hang the process if it's in the background.
*/
p = curproc;
if (isbackground(p, tp) &&
ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 &&
!sigismember(&p->p_sigignore, SIGTTOU) &&
!sigismember(&p->p_sigmask, SIGTTOU)) {
if (p->p_pgrp->pg_jobc == 0) {
error = EIO;
goto out;
}
pgsignal(p->p_pgrp, SIGTTOU, 1);
error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, ttybg, 0);
if (error)
goto out;
goto loop;
}
/*
* 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 = min(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, 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) {
/* out of space */
goto overfull;
}
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) {
/* out of space */
goto overfull;
}
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);
overfull:
/*
* Since we are using ring buffers, if we can't insert any more into
* the output queue, we can assume the ring is full and that someone
* forgot to set the high water mark correctly. We set it and then
* proceed as normal.
*/
hiwat = tp->t_outq.c_cc - 1;
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_ASLEEP);
error = ttysleep(tp, &tp->t_outq, TTOPRI | PCATCH, ttyout, 0);
splx(s);
if (error)
goto out;
goto loop;
}
/*
* Rubout one character from the rawq of tp
* as cleanly as possible.
*/
void
ttyrub(c, tp)
int c;
struct tty *tp;
{
u_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;
for (cp = firstc(&tp->t_rawq, &tabc); 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);
--tp->t_rocount;
}
/*
* Back over cnt characters, erasing them.
*/
static void
ttyrubo(tp, cnt)
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.
*/
void
ttyretype(tp)
struct tty *tp;
{
u_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);
s = spltty();
for (cp = firstc(&tp->t_canq, &c); cp; cp = nextc(&tp->t_canq, cp, &c))
ttyecho(c, tp);
for (cp = firstc(&tp->t_rawq, &c); cp; 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(c, tp)
int c;
struct tty *tp;
{
if (!ISSET(tp->t_state, TS_CNTTB))
CLR(tp->t_lflag, FLUSHO);
if ((!ISSET(tp->t_lflag, ECHO) &&
(!ISSET(tp->t_lflag, ECHONL) || c != '\n')) ||
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(tp)
struct tty *tp;
{
selwakeup(&tp->t_rsel);
if (ISSET(tp->t_state, TS_ASYNC))
pgsignal(tp->t_pgrp, SIGIO, 1);
wakeup((caddr_t)&tp->t_rawq);
}
/*
* 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(speed, table)
int speed;
struct speedtab *table;
{
for ( ; table->sp_speed != -1; table++)
if (table->sp_speed == speed)
return (table->sp_code);
return (-1);
}
/*
* Set tty hi and low water marks.
*
* Try to arrange the dynamics so there's about one second
* from hi to low water.
*/
void
ttsetwater(tp)
struct tty *tp;
{
int cps, x;
#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
cps = tp->t_ospeed / 10;
tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
x += cps;
x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT);
tp->t_hiwat = roundup(x, CBSIZE);
#undef CLAMP
}
/*
* Report on state of foreground process group.
*/
void
ttyinfo(tp)
struct tty *tp;
{
struct proc *p, *pick;
struct timeval utime, stime;
int tmp;
if (ttycheckoutq(tp,0) == 0)
return;
/* Print load average. */
tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
if (tp->t_session == NULL)
ttyprintf(tp, "not a controlling terminal\n");
else if (tp->t_pgrp == NULL)
ttyprintf(tp, "no foreground process group\n");
else if ((p = tp->t_pgrp->pg_members.lh_first) == 0)
ttyprintf(tp, "empty foreground process group\n");
else {
/* Pick interesting process. */
for (pick = NULL; p != NULL; p = p->p_pglist.le_next)
if (proc_compare(pick, p))
pick = p;
ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid,
pick->p_stat == SONPROC ? "running" :
pick->p_stat == SRUN ? "runnable" :
pick->p_wmesg ? pick->p_wmesg : "iowait");
calcru(pick, &utime, &stime, NULL);
/* Round up and print user time. */
utime.tv_usec += 5000;
if (utime.tv_usec >= 1000000) {
utime.tv_sec += 1;
utime.tv_usec -= 1000000;
}
ttyprintf(tp, "%ld.%02ldu ", (long int)utime.tv_sec,
(long int)utime.tv_usec / 10000);
/* Round up and print system time. */
stime.tv_usec += 5000;
if (stime.tv_usec >= 1000000) {
stime.tv_sec += 1;
stime.tv_usec -= 1000000;
}
ttyprintf(tp, "%ld.%02lds ", (long int)stime.tv_sec,
(long int)stime.tv_usec / 10000);
#define pgtok(a) (((u_long) ((a) * NBPG) / 1024))
/* Print percentage cpu. */
tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
ttyprintf(tp, "%d%% ", tmp / 100);
/* Print resident set size. */
if (pick->p_stat == SIDL || P_ZOMBIE(pick))
tmp = 0;
else {
struct vmspace *vm = pick->p_vmspace;
tmp = pgtok(vm_resident_count(vm));
}
ttyprintf(tp, "%dk\n", tmp);
}
tp->t_rocount = 0; /* so pending input will be retyped if BS */
}
/*
* 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 ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL) || \
((p)->p_stat == SONPROC))
#define TESTAB(a, b) ((a)<<1 | (b))
#define ONLYA 2
#define ONLYB 1
#define BOTH 3
static int
proc_compare(p1, p2)
struct proc *p1, *p2;
{
if (p1 == NULL)
return (1);
/*
* see if at least one of them is runnable
*/
switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
case ONLYA:
return (0);
case ONLYB:
return (1);
case BOTH:
/*
* tie - favor one with highest recent cpu utilization
*/
if (p2->p_estcpu > p1->p_estcpu)
return (1);
if (p1->p_estcpu > p2->p_estcpu)
return (0);
return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
}
/*
* weed out zombies
*/
switch (TESTAB(P_ZOMBIE(p1), P_ZOMBIE(p2))) {
case ONLYA:
return (1);
case ONLYB:
return (0);
case BOTH:
return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
}
/*
* pick the one with the smallest sleep time
*/
if (p2->p_slptime > p1->p_slptime)
return (0);
if (p1->p_slptime > p2->p_slptime)
return (1);
/*
* favor one sleeping in a non-interruptible sleep
*/
if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
return (1);
if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
return (0);
return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
}
/*
* Output char to tty; console putchar style.
*/
int
tputchar(c, tp)
int c;
struct tty *tp;
{
int s;
s = spltty();
if (ISSET(tp->t_state,
TS_CARR_ON | TS_ISOPEN) != (TS_CARR_ON | TS_ISOPEN)) {
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/ETIMEDOUT) reported by tsleep. If
* the tty is revoked, restarting a pending call will redo validation done
* at the start of the call.
*/
int
ttysleep(tp, chan, pri, wmesg, timo)
struct tty *tp;
void *chan;
int pri, timo;
const char *wmesg;
{
int error;
short gen;
gen = tp->t_gen;
if ((error = tsleep(chan, pri, wmesg, timo)) != 0)
return (error);
return (tp->t_gen == gen ? 0 : ERESTART);
}
/*
* Initialise the global tty list.
*/
void
tty_init()
{
TAILQ_INIT(&ttylist);
tty_count = 0;
pool_init(&tty_pool, sizeof(struct tty), 0, 0, 0, "ttypl",
0, pool_page_alloc_nointr, pool_page_free_nointr, M_TTYS);
}
/*
* Attach a tty to the tty list.
*
* This should be called ONLY once per real tty (including pty's).
* eg, on the sparc, the keyboard and mouse have struct tty's that are
* distinctly NOT usable as tty's, and thus should not be attached to
* the ttylist. This is why this call is not done from ttymalloc().
*
* Device drivers should attach tty's at a similar time that they are
* ttymalloc()'ed, or, for the case of statically allocated struct tty's
* either in the attach or (first) open routine.
*/
void
tty_attach(tp)
struct tty *tp;
{
TAILQ_INSERT_TAIL(&ttylist, tp, tty_link);
++tty_count;
}
/*
* Remove a tty from the tty list.
*/
void
tty_detach(tp)
struct tty *tp;
{
--tty_count;
#ifdef DIAGNOSTIC
if (tty_count < 0)
panic("tty_detach: tty_count < 0");
#endif
TAILQ_REMOVE(&ttylist, tp, tty_link);
}
/*
* Allocate a tty structure and its associated buffers.
*/
struct tty *
ttymalloc()
{
struct tty *tp;
tp = pool_get(&tty_pool, PR_WAITOK);
memset(tp, 0, sizeof(*tp));
callout_init(&tp->t_outq_ch);
callout_init(&tp->t_rstrt_ch);
/* XXX: default to 1024 chars for now */
clalloc(&tp->t_rawq, 1024, 1);
clalloc(&tp->t_canq, 1024, 1);
/* output queue doesn't need quoting */
clalloc(&tp->t_outq, 1024, 0);
return(tp);
}
/*
* Free a tty structure and its buffers.
*
* Be sure to call tty_detach() for any tty that has been
* tty_attach()ed.
*/
void
ttyfree(tp)
struct tty *tp;
{
callout_stop(&tp->t_outq_ch);
callout_stop(&tp->t_rstrt_ch);
clfree(&tp->t_rawq);
clfree(&tp->t_canq);
clfree(&tp->t_outq);
pool_put(&tty_pool, tp);
}
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