3f4f80d7dc
2. Even if ttywait() fails, call ttyflush(FREAD) in ttywflush. This two fixes guarantee that queues are empty after calling ttywflush() in any case
2143 lines
49 KiB
C
2143 lines
49 KiB
C
/*-
|
|
* 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 8.8 (Berkeley) 1/21/94
|
|
* $Id: tty.c,v 1.21 1995/02/09 11:13:30 jkh Exp $
|
|
*/
|
|
|
|
#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/signalvar.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/malloc.h>
|
|
|
|
#include <vm/vm.h>
|
|
|
|
static int proc_compare __P((struct proc *p1, struct proc *p2));
|
|
static void ttyblock __P((struct tty *tp));
|
|
static void ttyecho __P((int, struct tty *tp));
|
|
static void ttyrubo __P((struct tty *, int));
|
|
|
|
/* Symbolic sleep message strings. */
|
|
char ttclos[] = "ttycls";
|
|
char ttopen[] = "ttyopn";
|
|
char ttybg[] = "ttybg";
|
|
char ttybuf[] = "ttybuf";
|
|
char ttyin[] = "ttyin";
|
|
char ttyout[] = "ttyout";
|
|
|
|
/*
|
|
* 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) &= ~(f)
|
|
#define ISSET(t, f) ((t) & (f))
|
|
|
|
/*
|
|
* Initial open of tty, or (re)entry to standard tty line discipline.
|
|
*/
|
|
int
|
|
ttyopen(device, tp)
|
|
dev_t device;
|
|
register struct tty *tp;
|
|
{
|
|
int s;
|
|
|
|
s = spltty();
|
|
tp->t_dev = device;
|
|
if (!ISSET(tp->t_state, TS_ISOPEN)) {
|
|
SET(tp->t_state, TS_ISOPEN);
|
|
bzero(&tp->t_winsize, sizeof(tp->t_winsize));
|
|
}
|
|
CLR(tp->t_state, TS_WOPEN);
|
|
|
|
/*
|
|
* Initialize or restore a cblock allocation policy suitable for
|
|
* the standard line discipline.
|
|
*/
|
|
clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
|
|
clist_alloc_cblocks(&tp->t_outq, TTMAXHIWAT + 200, 512);
|
|
clist_alloc_cblocks(&tp->t_rawq, TTYHOG, TTYHOG);
|
|
|
|
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)
|
|
register struct tty *tp;
|
|
{
|
|
extern struct tty *constty; /* Temporary virtual console. */
|
|
int s;
|
|
|
|
s = spltty();
|
|
if (constty == tp)
|
|
constty = NULL;
|
|
|
|
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_pgrp = NULL;
|
|
tp->t_session = NULL;
|
|
tp->t_state = 0;
|
|
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) \
|
|
((c) == '\n' || (((c) == cc[VEOF] || \
|
|
(c) == cc[VEOL] || (c) == cc[VEOL2]) && (c) != _POSIX_VDISABLE))
|
|
|
|
|
|
/*
|
|
* Process input of a single character received on a tty.
|
|
*/
|
|
int
|
|
ttyinput(c, tp)
|
|
register int c;
|
|
register struct tty *tp;
|
|
{
|
|
register int iflag, lflag;
|
|
register u_char *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;
|
|
|
|
/* Handle exceptional conditions (break, parity, framing). */
|
|
cc = tp->t_cc;
|
|
iflag = tp->t_iflag;
|
|
err = (ISSET(c, TTY_ERRORMASK));
|
|
if (err) {
|
|
CLR(c, TTY_ERRORMASK);
|
|
if (ISSET(err, TTY_FE) && !c) { /* Break. */
|
|
if (ISSET(iflag, IGNBRK))
|
|
goto endcase;
|
|
else if (ISSET(iflag, BRKINT) &&
|
|
ISSET(lflag, ISIG) &&
|
|
(cc[VINTR] != _POSIX_VDISABLE))
|
|
c = cc[VINTR];
|
|
else if (ISSET(iflag, PARMRK))
|
|
goto parmrk;
|
|
} else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
|
|
|| ISSET(err, TTY_FE)) {
|
|
if (ISSET(iflag, IGNPAR))
|
|
goto endcase;
|
|
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);
|
|
goto endcase;
|
|
} else
|
|
c = 0;
|
|
}
|
|
}
|
|
/*
|
|
* In tandem mode, check high water mark.
|
|
*/
|
|
if (ISSET(iflag, IXOFF))
|
|
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);
|
|
#ifdef sun4c /* XXX */
|
|
(*tp->t_stop)(tp, 0);
|
|
#else
|
|
(*cdevsw[major(tp->t_dev)].d_stop)(tp,
|
|
0);
|
|
#endif
|
|
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;
|
|
}
|
|
/*
|
|
* 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)) {
|
|
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)
|
|
register int c;
|
|
register struct tty *tp;
|
|
{
|
|
register long oflag;
|
|
register 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 (putc('\r', &tp->t_outq))
|
|
return (c);
|
|
}
|
|
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:
|
|
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)
|
|
register struct tty *tp;
|
|
int cmd, flag;
|
|
void *data;
|
|
{
|
|
extern struct tty *constty; /* Temporary virtual console. */
|
|
extern int nlinesw;
|
|
register struct proc *p;
|
|
int s, error;
|
|
|
|
p = curproc; /* XXX */
|
|
|
|
/* If the ioctl involves modification, hang if in the background. */
|
|
switch (cmd) {
|
|
case TIOCFLUSH:
|
|
case TIOCSETA:
|
|
case TIOCSETD:
|
|
case TIOCSETAF:
|
|
case TIOCSETAW:
|
|
#ifdef notdef
|
|
case TIOCSPGRP:
|
|
#endif
|
|
case TIOCSTAT:
|
|
case TIOCSTI:
|
|
case TIOCSWINSZ:
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
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 &&
|
|
(p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
|
|
(p->p_sigmask & sigmask(SIGTTOU)) == 0) {
|
|
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 */
|
|
register 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))
|
|
return (error);
|
|
#endif
|
|
constty = tp;
|
|
} else if (tp == constty)
|
|
constty = NULL;
|
|
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 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 */
|
|
register struct termios *t = (struct termios *)data;
|
|
|
|
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.
|
|
*/
|
|
if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
|
|
splx(s);
|
|
return (error);
|
|
} else {
|
|
if (!ISSET(tp->t_state, TS_CARR_ON) &&
|
|
ISSET(tp->t_cflag, CLOCAL) &&
|
|
!ISSET(t->c_cflag, CLOCAL)) {
|
|
#if 0
|
|
CLR(tp->t_state, TS_ISOPEN);
|
|
SET(tp->t_state, TS_WOPEN);
|
|
#endif
|
|
ttwakeup(tp);
|
|
}
|
|
tp->t_cflag = t->c_cflag;
|
|
tp->t_ispeed = t->c_ispeed;
|
|
tp->t_ospeed = t->c_ospeed;
|
|
}
|
|
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);
|
|
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 */
|
|
register 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);
|
|
#ifdef sun4c /* XXX */
|
|
(*tp->t_stop)(tp, 0);
|
|
#else
|
|
(*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
|
|
#endif
|
|
}
|
|
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 */
|
|
register struct pgrp *pgrp = pgfind(*(int *)data);
|
|
|
|
if (!isctty(p, tp))
|
|
return (ENOTTY);
|
|
else if (pgrp == NULL || pgrp->pg_session != p->p_session)
|
|
return (EPERM);
|
|
tp->t_pgrp = pgrp;
|
|
break;
|
|
}
|
|
case TIOCSTAT: /* simulate control-T */
|
|
ttyinfo(tp);
|
|
break;
|
|
case TIOCSWINSZ: /* set window size */
|
|
if (bcmp((caddr_t)&tp->t_winsize, data,
|
|
sizeof (struct winsize))) {
|
|
tp->t_winsize = *(struct winsize *)data;
|
|
pgsignal(tp->t_pgrp, SIGWINCH, 1);
|
|
}
|
|
break;
|
|
case TIOCSDRAINWAIT:
|
|
error = suser(p->p_ucred, &p->p_acflag);
|
|
if (error)
|
|
return (error);
|
|
tp->t_timeout = *(int *)data * hz;
|
|
wakeup((caddr_t)&tp->t_outq);
|
|
break;
|
|
case TIOCGDRAINWAIT:
|
|
*(int *)data = tp->t_timeout / hz;
|
|
break;
|
|
default:
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
return (ttcompat(tp, cmd, data, flag));
|
|
#else
|
|
return (-1);
|
|
#endif
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ttselect(device, rw, p)
|
|
dev_t device;
|
|
int rw;
|
|
struct proc *p;
|
|
{
|
|
register struct tty *tp;
|
|
int nread, s;
|
|
|
|
tp = &cdevsw[major(device)].d_ttys[minor(device)];
|
|
|
|
s = spltty();
|
|
switch (rw) {
|
|
case FREAD:
|
|
nread = ttnread(tp);
|
|
if (nread > 0 || (!ISSET(tp->t_cflag, CLOCAL) &&
|
|
!ISSET(tp->t_state, TS_CARR_ON)))
|
|
goto win;
|
|
selrecord(p, &tp->t_rsel);
|
|
break;
|
|
case FWRITE:
|
|
if (tp->t_outq.c_cc <= tp->t_lowat) {
|
|
win: splx(s);
|
|
return (1);
|
|
}
|
|
selrecord(p, &tp->t_wsel);
|
|
break;
|
|
}
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This is now exported to the cy driver as well; if you hack this code,
|
|
* then be sure to keep /sys/i386/isa/cy.c properly advised! -jkh
|
|
*/
|
|
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] == 0)
|
|
nread = 0;
|
|
}
|
|
return (nread);
|
|
}
|
|
|
|
/*
|
|
* Wait for output to drain.
|
|
*/
|
|
int
|
|
ttywait(tp)
|
|
register 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_CARR_ON) || ISSET(tp->t_cflag, CLOCAL))
|
|
&& tp->t_oproc) {
|
|
(*tp->t_oproc)(tp);
|
|
if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
|
|
(ISSET(tp->t_state, TS_CARR_ON) || ISSET(tp->t_cflag, CLOCAL))) {
|
|
SET(tp->t_state, TS_ASLEEP);
|
|
error = ttysleep(tp, &tp->t_outq, TTOPRI | PCATCH,
|
|
ttyout, tp->t_timeout);
|
|
if (error)
|
|
break;
|
|
}
|
|
}
|
|
/* If some output still there, kill it */
|
|
if (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))
|
|
ttyflush(tp, FWRITE);
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Flush after waiting.
|
|
*/
|
|
int
|
|
ttywflush(tp)
|
|
struct tty *tp;
|
|
{
|
|
int error;
|
|
|
|
error = ttywait(tp);
|
|
ttyflush(tp, FREAD);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Flush tty read and/or write queues, notifying anyone waiting.
|
|
*/
|
|
void
|
|
ttyflush(tp, rw)
|
|
register struct tty *tp;
|
|
int rw;
|
|
{
|
|
register int s;
|
|
|
|
s = spltty();
|
|
if (rw & FWRITE)
|
|
CLR(tp->t_state, TS_TTSTOP);
|
|
#ifdef sun4c /* XXX */
|
|
(*tp->t_stop)(tp, rw);
|
|
#else
|
|
(*cdevsw[major(tp->t_dev)].d_stop)(tp, rw);
|
|
#endif
|
|
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) {
|
|
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;
|
|
{
|
|
|
|
bcopy(ttydefchars, tp->t_cc, sizeof(ttydefchars));
|
|
}
|
|
|
|
/*
|
|
* Send stop character on input overflow.
|
|
*/
|
|
static void
|
|
ttyblock(tp)
|
|
register struct tty *tp;
|
|
{
|
|
register 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 &&
|
|
tp->t_cc[VSTOP] != _POSIX_VDISABLE)) {
|
|
if (putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) {
|
|
SET(tp->t_state, TS_TBLOCK);
|
|
ttstart(tp);
|
|
}
|
|
}
|
|
}
|
|
|
|
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 & IO_NDELAY)
|
|
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)
|
|
register struct tty *tp;
|
|
int flag;
|
|
{
|
|
|
|
if (!ISSET(tp->t_state, TS_WOPEN) && ISSET(tp->t_cflag, MDMBUF)) {
|
|
/*
|
|
* MDMBUF: do flow control according to carrier flag
|
|
*/
|
|
if (flag) {
|
|
CLR(tp->t_state, TS_TTSTOP);
|
|
ttstart(tp);
|
|
} else if (!ISSET(tp->t_state, TS_TTSTOP)) {
|
|
SET(tp->t_state, TS_TTSTOP);
|
|
#ifdef sun4c /* XXX */
|
|
(*tp->t_stop)(tp, 0);
|
|
#else
|
|
(*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
|
|
#endif
|
|
}
|
|
} 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)) {
|
|
if (tp->t_session && tp->t_session->s_leader)
|
|
psignal(tp->t_session->s_leader, SIGHUP);
|
|
ttyflush(tp, FREAD | FWRITE);
|
|
return (0);
|
|
}
|
|
} else {
|
|
/*
|
|
* 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)
|
|
register struct tty *tp;
|
|
int flag;
|
|
{
|
|
|
|
if (flag)
|
|
SET(tp->t_state, TS_CARR_ON);
|
|
else {
|
|
CLR(tp->t_state, TS_CARR_ON);
|
|
if (!ISSET(tp->t_cflag, CLOCAL)) {
|
|
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)
|
|
register struct tty *tp;
|
|
{
|
|
struct clist tq;
|
|
register 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(tp, uio, flag)
|
|
register struct tty *tp;
|
|
struct uio *uio;
|
|
int flag;
|
|
{
|
|
register struct clist *qp;
|
|
register int c;
|
|
register tcflag_t lflag;
|
|
register cc_t *cc = tp->t_cc;
|
|
register struct proc *p = curproc;
|
|
int s, first, error = 0, carrier;
|
|
int has_stime = 0, last_cc = 0;
|
|
long slp = 0; /* XXX this should be renamed `timo'. */
|
|
|
|
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);
|
|
if ((p->p_sigignore & sigmask(SIGTTIN)) ||
|
|
(p->p_sigmask & 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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
carrier = ISSET(tp->t_state, TS_CARR_ON) ||
|
|
ISSET(tp->t_cflag, CLOCAL);
|
|
if ((!carrier && ISSET(tp->t_state, TS_ISOPEN)) ||
|
|
!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 stime, timecopy;
|
|
int x;
|
|
|
|
/*
|
|
* 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;
|
|
x = splclock();
|
|
timecopy = time;
|
|
splx(x);
|
|
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;
|
|
x = splclock();
|
|
timecopy = time;
|
|
splx(x);
|
|
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
|
|
/*
|
|
* 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.
|
|
* XXX see hzto() for how to avoid overflow if hz
|
|
* is large (divide by `tick' and/or arrange to
|
|
* use hzto() if hz is large).
|
|
*/
|
|
slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
|
|
goto 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.
|
|
*/
|
|
if (qp->c_cc <= 0) {
|
|
sleep:
|
|
carrier = ISSET(tp->t_state, TS_CARR_ON) ||
|
|
ISSET(tp->t_cflag, CLOCAL);
|
|
if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) {
|
|
splx(s);
|
|
return (0); /* EOF */
|
|
}
|
|
error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH,
|
|
carrier ? ttyin : ttopen, (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;
|
|
while ((c = getc(qp)) >= 0) {
|
|
/*
|
|
* delayed suspend (^Y)
|
|
*/
|
|
if (CCEQ(cc[VDSUSP], c) && ISSET(lflag, 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))
|
|
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 (cc[VSTART] != _POSIX_VDISABLE &&
|
|
putc(cc[VSTART], &tp->t_outq) == 0) {
|
|
CLR(tp->t_state, TS_TBLOCK);
|
|
ttstart(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(tp, wait)
|
|
register struct tty *tp;
|
|
int wait;
|
|
{
|
|
int hiwat, s, oldsig;
|
|
|
|
hiwat = tp->t_hiwat;
|
|
s = spltty();
|
|
oldsig = wait ? curproc->p_siglist : 0;
|
|
if (tp->t_outq.c_cc > hiwat + 200)
|
|
while (tp->t_outq.c_cc > hiwat) {
|
|
ttstart(tp);
|
|
if (wait == 0 || curproc->p_siglist != oldsig) {
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
timeout((void (*)__P((void *)))wakeup,
|
|
(void *)&tp->t_outq, hz);
|
|
SET(tp->t_state, TS_ASLEEP);
|
|
(void) tsleep((caddr_t)&tp->t_outq, PZERO - 1, "ttoutq", 0);
|
|
}
|
|
splx(s);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Process a write call on a tty device.
|
|
*/
|
|
int
|
|
ttwrite(tp, uio, flag)
|
|
register struct tty *tp;
|
|
register struct uio *uio;
|
|
int flag;
|
|
{
|
|
register char *cp = 0;
|
|
register int cc, ce;
|
|
register struct proc *p;
|
|
int i, hiwat, cnt, error, s;
|
|
char obuf[OBUFSIZ];
|
|
|
|
hiwat = tp->t_hiwat;
|
|
cnt = uio->uio_resid;
|
|
error = 0;
|
|
cc = 0;
|
|
loop:
|
|
s = spltty();
|
|
if (!ISSET(tp->t_state, TS_CARR_ON) &&
|
|
!ISSET(tp->t_cflag, CLOCAL)) {
|
|
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 &&
|
|
(p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
|
|
(p->p_sigmask & sigmask(SIGTTOU)) == 0 &&
|
|
p->p_pgrp->pg_jobc) {
|
|
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, (u_char *)cp,
|
|
(u_char *)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, ttybuf, 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, ttybuf, 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_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)
|
|
register int c;
|
|
register struct tty *tp;
|
|
{
|
|
register char *cp;
|
|
register 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);
|
|
--tp->t_rocount;
|
|
}
|
|
|
|
/*
|
|
* Back over cnt characters, erasing them.
|
|
*/
|
|
static void
|
|
ttyrubo(tp, cnt)
|
|
register 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)
|
|
register struct tty *tp;
|
|
{
|
|
register 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(c, tp)
|
|
register int c;
|
|
register 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)
|
|
register 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;
|
|
register 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;
|
|
{
|
|
register 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)
|
|
register struct tty *tp;
|
|
{
|
|
register 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_mem) == NULL)
|
|
ttyprintf(tp, "empty foreground process group\n");
|
|
else {
|
|
/* Pick interesting process. */
|
|
for (pick = NULL; p != NULL; p = p->p_pgrpnxt)
|
|
if (proc_compare(pick, p))
|
|
pick = p;
|
|
|
|
ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid,
|
|
pick->p_stat == SRUN ? "running" :
|
|
pick->p_wmesg ? pick->p_wmesg : "iowait");
|
|
|
|
calcru(pick, &utime, &stime, NULL);
|
|
|
|
/* Print user time. */
|
|
ttyprintf(tp, "%d.%02du ",
|
|
utime.tv_sec, utime.tv_usec / 10000);
|
|
|
|
/* Print system time. */
|
|
ttyprintf(tp, "%d.%02ds ",
|
|
stime.tv_sec, stime.tv_usec / 10000);
|
|
|
|
#define pgtok(a) (((a) * NBPG) / 1024)
|
|
/* Print percentage cpu, resident set size. */
|
|
tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
|
|
ttyprintf(tp, "%d%% %dk\n",
|
|
tmp / 100,
|
|
pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 :
|
|
#ifdef pmap_resident_count
|
|
pgtok(pmap_resident_count(&pick->p_vmspace->vm_pmap))
|
|
#else
|
|
pgtok(pick->p_vmspace->vm_rssize)
|
|
#endif
|
|
);
|
|
}
|
|
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))
|
|
#define TESTAB(a, b) ((a)<<1 | (b))
|
|
#define ONLYA 2
|
|
#define ONLYB 1
|
|
#define BOTH 3
|
|
|
|
static int
|
|
proc_compare(p1, p2)
|
|
register 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(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
|
|
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;
|
|
{
|
|
register 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;
|
|
char *wmesg;
|
|
{
|
|
int error;
|
|
short gen;
|
|
|
|
gen = tp->t_gen;
|
|
error = tsleep(chan, pri, wmesg, timo);
|
|
if (error)
|
|
return (error);
|
|
return (tp->t_gen == gen ? 0 : ERESTART);
|
|
}
|
|
|
|
/*
|
|
* Allocate a tty structure and its associated buffers.
|
|
*/
|
|
struct tty *
|
|
ttymalloc()
|
|
{
|
|
struct tty *tp;
|
|
|
|
MALLOC(tp, struct tty *, sizeof(struct tty), M_TTYS, M_WAITOK);
|
|
bzero(tp, sizeof *tp);
|
|
|
|
/*
|
|
* Initialize or restore a cblock allocation policy suitable for
|
|
* the standard line discipline.
|
|
*/
|
|
clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
|
|
clist_alloc_cblocks(&tp->t_outq, TTMAXHIWAT + 200, 512);
|
|
clist_alloc_cblocks(&tp->t_rawq, TTYHOG, 512);
|
|
|
|
return(tp);
|
|
}
|
|
|
|
/*
|
|
* Free a tty structure and its buffers.
|
|
*/
|
|
void
|
|
ttyfree(tp)
|
|
struct tty *tp;
|
|
{
|
|
clist_free_cblocks(&tp->t_canq);
|
|
clist_free_cblocks(&tp->t_outq);
|
|
clist_free_cblocks(&tp->t_rawq);
|
|
FREE(tp, M_TTYS);
|
|
}
|
|
|