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ttysvr.c
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ttysvr.c
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/* $XFree86: xc/programs/xterm/ttysvr.c,v 3.3 1998/10/25 07:12:53 dawes Exp $ */
/*
*
* ttysvr.c
*
* Simple tty server for xterm. Most of it is taken from Siebren's aterm.
*
* Author:
* Leendert van Doorn, 1992
*/
#include <ptyx.h>
#include <data.h>
#include <error.h>
#include <stdio.h>
extern char *ProgramName;
#ifdef AMOEBA
#include <sys/types.h>
#include <ailamoeba.h>
#include <signal.h>
#include <exception.h>
#include <thread.h>
#include <cmdreg.h>
#include <stdcom.h>
#include <stderr.h>
#include <limits.h>
#include <module/proc.h>
#include <file.h>
#include <fault.h>
#include <posix/termios.h>
#include <class/tios.h>
#include <server/tty/tty.h>
#include <module/name.h>
#include <module/rnd.h>
/*
* AIL stuff
*/
#define SAME_ENDIAN(w) (((w)&_AIL_ENDIAN) == (_ailword & _AIL_ENDIAN) )
extern char *tc_marshal();
extern char *tc_unmarshal();
extern void millisleep();
#define CTRL(c) ((c) & 0x1f)
/*
* Tty input data structure.
* This is a separate buffer in which the edited line is built.
*/
static char tty_line[_POSIX_MAX_CANON+1];
static char *tty_ptr;
static int tty_left;
/*
* A global flags which denotes whether we're busy with exiting. This
* prevents two cleanups to be running (one from ttythread, and one
* from the main stream code as a result of a failed _XAmSelect).
*/
int exiting = False;
/*
* Mutexes to prevent concurrent reads/writes
*/
static mutex read_mutex;
static mutex write_mutex;
port ttyport;
capability ttycap;
capability ttyintcap;
struct termios tios;
/*
* Initialize the TTY structures.
* Publish the tty capability when a name is provided.
*/
void
ttyinit(name)
char *name;
{
mu_init(&read_mutex);
mu_init(&write_mutex);
uniqport(&ttyport);
priv2pub(&ttyport, &ttycap.cap_port);
if (name != NULL) {
errstat err;
(void) name_delete(name);
if ((err = name_append(name, &ttycap)) != STD_OK) {
fprintf(stderr, "%s: cannot append %s: %s\n",
ProgramName, name, err_why(err));
Exit(1);
}
}
tios.c_iflag = ICRNL | IXON;
tios.c_oflag = OPOST;
tios.c_cflag = CREAD | CS8 | B9600;
tios.c_lflag = ECHO | ECHOE | ECHOK | ICANON | ISIG;
tios.c_cc[VEOF] = CTRL('D');
tios.c_cc[VEOL] = _POSIX_VDISABLE;
tios.c_cc[VERASE] = CTRL('H');
tios.c_cc[VINTR] = CTRL('C');
tios.c_cc[VKILL] = CTRL('U');
tios.c_cc[VMIN] = 1;
tios.c_cc[VQUIT] = CTRL('\\');
tios.c_cc[VSUSP] = _POSIX_VDISABLE;
tios.c_cc[VTIME] = 0;
tios.c_cc[VSTART] = CTRL('Q');
tios.c_cc[VSTOP] = CTRL('S');
}
/* ARGSUSED */
static void
ttycatcher(sig, us, extra)
signum sig;
thread_ustate *us;
char *extra;
{
*((int *)extra) = True;
}
void
ttythread()
{
TScreen *screen = &term->screen;
struct circbuf *iq, *oq;
header hdr;
char *buf;
int n, cause, detail;
int signalled;
struct termios ttios;
oq = screen->tty_outq;
iq = screen->tty_inq;
buf = (char *)malloc(BUFSIZ);
if (buf == (char *)NULL) {
fprintf(stderr, "%s: cannot malloc tty server buffer.\n",
ProgramName);
Exit(1);
}
sig_catch((signum) SIG_TRANS, ttycatcher, (char *) &signalled);
for (;;) {
if (exiting) { /* shell disappeared */
if (cause == TERM_STUNNED)
fprintf(stderr, "%s: stun code %d\n", ProgramName, detail);
else if (cause == TERM_EXCEPTION)
fprintf(stderr, "%s: exception code %d\n", ProgramName, detail);
else if (cause != TERM_NORMAL)
fprintf(stderr, "%s: termination cause %d, detail %d\n",
ProgramName, cause, detail);
Cleanup(0);
}
signalled = False;
do {
hdr.h_port = ttyport;
n = getreq(&hdr, (bufptr) buf, BUFSIZ);
} while (ERR_CONVERT(n) == RPC_ABORTED);
if (ERR_STATUS(n)) {
fprintf(stderr, "%s: get request failed (%s)\n",
ProgramName, err_why(ERR_CONVERT(n)));
Cleanup(1);
}
switch (hdr.h_command) {
case FSQ_CREATE:
hdr.h_status = STD_OK;
n = 0;
break;
case FSQ_READ:
if (!(tios.c_cflag & CREAD)) {
hdr.h_status = STD_NOTNOW;
n = 0;
break;
}
while (!signalled) {
if (mu_trylock(&read_mutex, -1) < 0)
continue;
hdr.h_size = ttycanonread(buf, (int)hdr.h_size, &signalled);
hdr.h_extra = tty_left > 0 ? FSE_MOREDATA : FSE_NOMOREDATA;
mu_unlock(&read_mutex);
break;
}
n = hdr.h_size;
hdr.h_status = signalled ? STD_INTR : STD_OK;
break;
case FSQ_WRITE:
mu_lock(&write_mutex);
n = ttywrite(buf, n);
mu_unlock(&write_mutex);
hdr.h_size = n;
hdr.h_status = STD_OK;
n = 0;
break;
case TTQ_CLOSE:
case TTQ_STATUS:
case TTQ_CONTROL:
case TTQ_TIME_READ:
hdr.h_status = STD_COMBAD;
n = 0;
break;
case TIOS_SETATTR:
(void) tc_unmarshal(buf, &ttios, SAME_ENDIAN(hdr.h_size));
if (tios_check(&ttios)) {
hdr.h_status = STD_OK;
tios = ttios;
} else
hdr.h_status = STD_ARGBAD;
n = 0;
break;
case TIOS_GETATTR:
n = tc_marshal(buf, tios, SAME_ENDIAN(hdr.h_extra)) - buf;
hdr.h_status = STD_OK;
break;
case TIOS_SENDBREAK:
case TIOS_DRAIN:
case TIOS_FLUSH:
case TIOS_FLOW:
hdr.h_status = STD_OK;
n = 0;
break;
case TIOS_GETWSIZE:
hdr.h_extra = screen->max_col + 1;
hdr.h_size = screen->max_row + 1;
hdr.h_status = STD_OK;
n = 0;
break;
case STD_AGE:
case STD_COPY:
case STD_RESTRICT:
hdr.h_status = STD_COMBAD;
n = 0;
break;
case STD_TOUCH:
hdr.h_status = STD_OK;
n = 0;
break;
case STD_DESTROY:
hdr.h_status = STD_DENIED;
n = 0;
break;
case STD_INFO:
hdr.h_status = STD_OK;
strcpy(buf, "+ Xterm tty server");
n = strlen(buf);
break;
case PS_CHECKPOINT:
exiting = True;
cb_putc(oq, '\0');
WakeupMainThread();
cause = hdr.h_extra;
detail = hdr.h_offset;
hdr.h_status = STD_OK;
n = 0;
break;
case PS_SWAPPROC:
hdr.h_status = STD_OK;
n = 0;
break;
case TTQ_INTCAP:
if (n == sizeof(capability)) {
hdr.h_status = STD_OK;
bcopy(buf, (char *)&ttyintcap, sizeof(capability));
} else
hdr.h_status = STD_ARGBAD;
n = 0;
break;
default:
hdr.h_status = STD_COMBAD;
n = 0;
}
putrep(&hdr, (bufptr) buf, n);
}
}
int
tios_check(tp)
struct termios *tp;
{
register int i, j;
/*
* Check that all chars in th c_cc array are
* different, except VTIME and VMIN
*/
for (i = 0; i < sizeof(tp->c_cc); ++i) {
if (i != VTIME && i != VMIN) for (j = 0; j < i; ++j)
if (j != VTIME && j != VMIN &&
tp->c_cc[i] == tp->c_cc[j] && tp->c_cc[i] != _POSIX_VDISABLE)
return False;
}
/* cannot change byte size */
if ((tp->c_cflag & CSIZE) != CS8)
return False;
return True;
}
void
erasechar(oq, n, echo)
struct circbuf *oq;
int n, echo;
{
register int rcol;
if (!echo) return;
if (n > 0) {
rcol = n - 1;
cb_putc(oq, '\b');
if (tios.c_lflag & ECHOE)
cb_puts(oq, " \b", 2);
} else
cb_putc(oq, CTRL('G'));
WakeupMainThread();
}
void
linekill(oq, n, echo)
struct circbuf *oq;
int n, echo;
{
register int rcol;
if (!echo) return;
if (n > 0) {
for (rcol = n-1; rcol >= 0; rcol--) {
cb_putc(oq, '\b');
if (tios.c_lflag & ECHOK)
cb_puts(oq, " \b", 2);
}
} else
cb_putc(oq, CTRL('G'));
WakeupMainThread();
}
/*
* Canonize
*/
#define ISSET(t, flag) (((t).c_lflag & flag) != 0)
void
canonize(signalled)
int *signalled;
{
TScreen *screen = &term->screen;
struct circbuf *iq, *oq;
int ch, n;
int stop;
n = 0;
oq = screen->tty_outq;
iq = screen->tty_inq;
for (stop = False; !stop; ) {
/* get a character, depending on canonisation */
if (!ISSET(tios, ICANON)) {
/*
* No canonization
*/
int time = tios.c_cc[VTIME] * 100; /* inter-byte delay (in msec) */
ch = time ? cb_trygetc(iq, time) : cb_trygetc(iq, -1);
if (ch < 0 || *signalled)
break;
} else {
/*
* Canonized input
*/
ch = cb_trygetc(iq, -1);
if (ch == -1)
break;
}
/* ICANON may have changed while we waited for the first character */
if (!ISSET(tios, ICANON)) {
int min = tios.c_cc[VMIN]; /* minimum characters to read */
if (ISSET(tios, ECHO)) cb_putc(oq, ch);
tty_line[n++] = ch;
if (n >= sizeof(tty_line) || (min > 0 && n >= min))
break;
} else {
if (tios.c_iflag & ISTRIP) ch &= 0x7f;
if (ch == tios.c_cc[VEOF]) {
stop = True;
} else if (ch == tios.c_cc[VERASE]) {
/* erase a single character */
erasechar(oq, n, ISSET(tios, ECHO));
if (n != 0) n--;
} else if (ch == tios.c_cc[VKILL]) {
/* erase a whole line */
linekill(oq, n, ISSET(tios, ECHO));
n = 0;
} else {
if (n > sizeof(tty_line)) {
cb_putc(oq, CTRL('G'));
continue;
}
if (ch == '\r' || ch == '\n' || ch == tios.c_cc[VEOL]) {
if (tios.c_iflag & ICRNL)
ch = '\n';
else if (tios.c_iflag & INLCR)
ch = '\r';
if (ch == '\n' && tios.c_iflag & ICRNL)
cb_putc(oq, '\r');
stop = True;
}
if (ISSET(tios, ECHO)) cb_putc(oq, ch);
tty_line[n++] = ch;
}
}
}
if (ISSET(tios, ECHO)) WakeupMainThread();
tty_left = n;
tty_ptr = tty_line;
}
/*
* Canonized tty read
*/
int
ttycanonread(buf, size, signalled)
char *buf;
size_t size;
int *signalled;
{
if (tty_left == 0)
canonize(signalled);
if (size > tty_left)
size = tty_left;
strncpy(buf, tty_ptr, size);
tty_ptr += size;
tty_left -= size;
return size;
}
/*
* Write data to tty
*/
int
ttywrite(buf, size)
char *buf;
int size;
{
TScreen *screen = &term->screen;
struct circbuf *oq;
int ch, i;
oq = screen->tty_outq;
for (i = 0; i < size; i++) {
if ((ch = buf[i]) == '\n' && tios.c_iflag & ICRNL)
cb_putc(oq, '\r');
cb_putc(oq, ch);
if (ch == '\n') {
/* Provide a wakeup for each line. Otherwise the circular buffer
* could be filled (thus blocking us) without the main thread
* knowing it can already process some data.
*/
WakeupMainThread();
}
}
WakeupMainThread();
return size;
}
static void
flush_read()
{
TScreen *screen = &term->screen;
struct circbuf *iq;
char *p;
int n;
iq = screen->tty_inq;
cb_putc(iq, '\n');
mu_lock(&read_mutex);
while ((n = cb_getp(iq, &p, 0/*don't block*/)) > 0)
cb_getpdone(iq, n);
tty_left = 0;
mu_unlock(&read_mutex);
WakeupMainThread();
}
/*
* Before characters are pushed onto the input stream of the shell
* process some of them may need some pre-processing. For example,
* interrupt should be processed as soon as possible to obtain the
* desired effect. This routine deals with key strokes that have
* such special properties.
*/
int
ttypreprocess(ch)
int ch;
{
if ((tios.c_lflag & ISIG) && ch == tios.c_cc[VQUIT]) {
if (!(tios.c_lflag & NOFLSH)) flush_read();
ttysendsig(SIGQUIT);
return 1;
}
if ((tios.c_lflag & ISIG) && ch == tios.c_cc[VINTR]) {
if (!(tios.c_lflag & NOFLSH)) flush_read();
ttysendsig(SIGINT);
return 1;
}
return 0;
}
/*
* Send Unix signal to shell
*/
ttysendsig(sig)
int sig;
{
header hdr;
long tout;
if (!(tios.c_lflag & ISIG))
return;
if (NULLPORT(&ttyintcap.cap_port))
return;
hdr.h_port = ttyintcap.cap_port;
hdr.h_priv = ttyintcap.cap_priv;
hdr.h_extra = sig;
hdr.h_command = TTI_SIGNAL;
tout = timeout(2000L);
trans(&hdr, NILBUF, 0, &hdr, NILBUF, 0);
timeout(tout);
}
#endif /* AMOEBA */