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minix3/drivers/tty/pty/tty.c

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/* TTY part of PTY. */
#include <assert.h>
#include <minix/drivers.h>
#include <minix/driver.h>
#include <termios.h>
#include <sys/ttycom.h>
#include <sys/ttydefaults.h>
#include <sys/fcntl.h>
#include <signal.h>
#include "tty.h"
#include <sys/time.h>
#include <sys/select.h>
/* Address of a tty structure. */
#define tty_addr(line) (&tty_table[line])
/* Macros for magic tty structure pointers. */
#define FIRST_TTY tty_addr(0)
#define END_TTY tty_addr(sizeof(tty_table) / sizeof(tty_table[0]))
/* A device exists if at least its 'devread' function is defined. */
#define tty_active(tp) ((tp)->tty_devread != NULL)
struct kmessages kmess;
static void tty_timed_out(minix_timer_t *tp);
static void settimer(tty_t *tty_ptr, int enable);
static void in_transfer(tty_t *tp);
static int tty_echo(tty_t *tp, int ch);
static void rawecho(tty_t *tp, int ch);
static int back_over(tty_t *tp);
static void reprint(tty_t *tp);
static void dev_ioctl(tty_t *tp);
static void setattr(tty_t *tp);
static void tty_icancel(tty_t *tp);
static int do_open(devminor_t minor, int access, endpoint_t user_endpt);
static int do_close(devminor_t minor);
static ssize_t do_read(devminor_t minor, u64_t position, endpoint_t endpt,
cp_grant_id_t grant, size_t size, int flags, cdev_id_t id);
static ssize_t do_write(devminor_t minor, u64_t position, endpoint_t endpt,
cp_grant_id_t grant, size_t size, int flags, cdev_id_t id);
static int do_ioctl(devminor_t minor, unsigned long request, endpoint_t endpt,
cp_grant_id_t grant, int flags, endpoint_t user_endpt, cdev_id_t id);
static int do_cancel(devminor_t minor, endpoint_t endpt, cdev_id_t id);
static int do_select(devminor_t minor, unsigned int ops, endpoint_t endpt);
static struct chardriver tty_tab = {
.cdr_open = do_open,
.cdr_close = do_close,
.cdr_read = do_read,
.cdr_write = do_write,
.cdr_ioctl = do_ioctl,
.cdr_cancel = do_cancel,
.cdr_select = do_select
};
/* Default attributes. */
static struct termios termios_defaults = {
.c_iflag = TTYDEF_IFLAG,
.c_oflag = TTYDEF_OFLAG,
.c_cflag = TTYDEF_CFLAG,
.c_lflag = TTYDEF_LFLAG,
.c_ispeed = TTYDEF_SPEED,
.c_ospeed = TTYDEF_SPEED,
.c_cc = {
[VEOF] = CEOF,
[VEOL] = CEOL,
[VERASE] = CERASE,
[VINTR] = CINTR,
[VKILL] = CKILL,
[VMIN] = CMIN,
[VQUIT] = CQUIT,
[VTIME] = CTIME,
[VSUSP] = CSUSP,
[VSTART] = CSTART,
[VSTOP] = CSTOP,
[VREPRINT] = CREPRINT,
[VLNEXT] = CLNEXT,
[VDISCARD] = CDISCARD,
[VSTATUS] = CSTATUS
}
};
static struct winsize winsize_defaults; /* = all zeroes */
static const char lined[TTLINEDNAMELEN] = "termios"; /* line discipline */
/* Global variables for the TTY task (declared extern in tty.h). */
tty_t tty_table[NR_PTYS];
u32_t system_hz;
static void tty_startup(void);
static int tty_init(int, sef_init_info_t *);
/*===========================================================================*
* tty_task *
*===========================================================================*/
int main(void)
{
/* Main routine of the terminal task. */
message tty_mess; /* buffer for all incoming messages */
int ipc_status;
int line;
int r;
register tty_t *tp;
tty_startup();
while (TRUE) {
/* Check for and handle any events on any of the ttys. */
for (tp = FIRST_TTY; tp < END_TTY; tp++) {
if (tp->tty_events) handle_events(tp);
}
/* Get a request message. */
r= driver_receive(ANY, &tty_mess, &ipc_status);
if (r != 0)
panic("driver_receive failed with: %d", r);
if (is_ipc_notify(ipc_status)) {
switch (_ENDPOINT_P(tty_mess.m_source)) {
case CLOCK:
/* run watchdogs of expired timers */
expire_timers(tty_mess.m_notify.timestamp);
break;
default:
/* do nothing */
break;
}
/* done, get new message */
continue;
}
if (!IS_CDEV_RQ(tty_mess.m_type)) {
chardriver_process(&tty_tab, &tty_mess, ipc_status);
continue;
}
/* Only device requests should get to this point.
* All requests have a minor device number.
*/
if (OK != chardriver_get_minor(&tty_mess, &line))
continue;
if ((line >= PTYPX_MINOR) && (line < (PTYPX_MINOR + NR_PTYS)) &&
tty_mess.m_type != CDEV_IOCTL) {
/* Terminals and pseudo terminals belong together. We can only
* make a distinction between the two based on position in the
* tty_table and not on minor number. Hence this special case.
*/
do_pty(&tty_mess, ipc_status);
continue;
}
/* Execute the requested device driver function. */
chardriver_process(&tty_tab, &tty_mess, ipc_status);
}
return 0;
}
tty_t *
line2tty(devminor_t line)
{
/* Convert a terminal line to tty_table pointer */
tty_t* tp;
if ((line - TTYPX_MINOR) < NR_PTYS) {
tp = tty_addr(line - TTYPX_MINOR);
} else if ((line - PTYPX_MINOR) < NR_PTYS) {
tp = tty_addr(line - PTYPX_MINOR);
} else {
tp = NULL;
}
return(tp);
}
/*===========================================================================*
* tty_startup *
*===========================================================================*/
static void tty_startup(void)
{
/* Register init callbacks. */
sef_setcb_init_fresh(tty_init);
sef_setcb_init_restart(tty_init);
/* No live update support for now. */
/* No signal support for now. */
/* Let SEF perform startup. */
sef_startup();
}
/*===========================================================================*
* do_read *
*===========================================================================*/
static ssize_t do_read(devminor_t minor, u64_t UNUSED(position),
endpoint_t endpt, cp_grant_id_t grant, size_t size, int flags,
cdev_id_t id)
{
/* A process wants to read from a terminal. */
tty_t *tp;
int r;
if ((tp = line2tty(minor)) == NULL)
return ENXIO;
/* Check if there is already a process hanging in a read, check if the
* parameters are correct, do I/O.
*/
if (tp->tty_incaller != NONE || tp->tty_inleft > 0)
return EIO;
if (size <= 0)
return EINVAL;
/* Copy information from the message to the tty struct. */
tp->tty_incaller = endpt;
tp->tty_inid = id;
tp->tty_ingrant = grant;
assert(tp->tty_incum == 0);
tp->tty_inleft = size;
if (!(tp->tty_termios.c_lflag & ICANON) && tp->tty_termios.c_cc[VTIME] > 0) {
if (tp->tty_termios.c_cc[VMIN] == 0) {
/* MIN & TIME specify a read timer that finishes the
* read in TIME/10 seconds if no bytes are available.
*/
settimer(tp, TRUE);
tp->tty_min = 1;
} else {
/* MIN & TIME specify an inter-byte timer that may
* have to be cancelled if there are no bytes yet.
*/
if (tp->tty_eotct == 0) {
settimer(tp, FALSE);
tp->tty_min = tp->tty_termios.c_cc[VMIN];
}
}
}
/* Anything waiting in the input buffer? Clear it out... */
in_transfer(tp);
/* ...then go back for more. */
handle_events(tp);
if (tp->tty_inleft == 0)
return EDONTREPLY; /* already done */
/* There were no bytes in the input queue available. */
if (flags & CDEV_NONBLOCK) {
tty_icancel(tp);
r = tp->tty_incum > 0 ? tp->tty_incum : EAGAIN;
tp->tty_inleft = tp->tty_incum = 0;
tp->tty_incaller = NONE;
return r;
}
if (tp->tty_select_ops)
select_retry(tp);
return EDONTREPLY; /* suspend the caller */
}
/*===========================================================================*
* do_write *
*===========================================================================*/
static ssize_t do_write(devminor_t minor, u64_t UNUSED(position),
endpoint_t endpt, cp_grant_id_t grant, size_t size, int flags,
cdev_id_t id)
{
/* A process wants to write on a terminal. */
tty_t *tp;
int r;
if ((tp = line2tty(minor)) == NULL)
return ENXIO;
/* Check if there is already a process hanging in a write, check if the
* parameters are correct, do I/O.
*/
if (tp->tty_outcaller != NONE || tp->tty_outleft > 0)
return EIO;
if (size <= 0)
return EINVAL;
/* Copy message parameters to the tty structure. */
tp->tty_outcaller = endpt;
tp->tty_outid = id;
tp->tty_outgrant = grant;
assert(tp->tty_outcum == 0);
tp->tty_outleft = size;
/* Try to write. */
handle_events(tp);
if (tp->tty_outleft == 0)
return EDONTREPLY; /* already done */
/* None or not all the bytes could be written. */
if (flags & CDEV_NONBLOCK) {
r = tp->tty_outcum > 0 ? tp->tty_outcum : EAGAIN;
tp->tty_outleft = tp->tty_outcum = 0;
tp->tty_outcaller = NONE;
return r;
}
if (tp->tty_select_ops)
select_retry(tp);
return EDONTREPLY; /* suspend the caller */
}
/*===========================================================================*
* do_ioctl *
*===========================================================================*/
static int do_ioctl(devminor_t minor, unsigned long request, endpoint_t endpt,
cp_grant_id_t grant, int flags, endpoint_t user_endpt, cdev_id_t id)
{
/* Perform an IOCTL on this terminal. POSIX termios calls are handled
* by the IOCTL system call.
*/
tty_t *tp;
int i, r;
if ((tp = line2tty(minor)) == NULL)
return ENXIO;
r = OK;
switch (request) {
case TIOCGETA:
/* Get the termios attributes. */
r = sys_safecopyto(endpt, grant, 0, (vir_bytes) &tp->tty_termios,
sizeof(struct termios));
break;
case TIOCSETAW:
case TIOCSETAF:
case TIOCDRAIN:
if (tp->tty_outleft > 0) {
if (flags & CDEV_NONBLOCK)
return EAGAIN;
/* Wait for all ongoing output processing to finish. */
tp->tty_iocaller = endpt;
tp->tty_ioid = id;
tp->tty_ioreq = request;
tp->tty_iogrant = grant;
return EDONTREPLY; /* suspend the caller */
}
if (request == TIOCDRAIN) break;
if (request == TIOCSETAF) tty_icancel(tp);
/*FALL THROUGH*/
case TIOCSETA:
/* Set the termios attributes. */
r = sys_safecopyfrom(endpt, grant, 0, (vir_bytes) &tp->tty_termios,
sizeof(struct termios));
if (r != OK) break;
setattr(tp);
break;
case TIOCFLUSH:
r = sys_safecopyfrom(endpt, grant, 0, (vir_bytes) &i, sizeof(i));
if (r != OK) break;
if(i & FREAD) { tty_icancel(tp); }
if(i & FWRITE) { (*tp->tty_ocancel)(tp, 0); }
break;
case TIOCSTART:
tp->tty_inhibited = 0;
tp->tty_events = 1;
break;
case TIOCSTOP:
tp->tty_inhibited = 1;
tp->tty_events = 1;
break;
case TIOCSBRK: /* tcsendbreak - turn break on */
if (tp->tty_break_on != NULL) (*tp->tty_break_on)(tp,0);
break;
case TIOCCBRK: /* tcsendbreak - turn break off */
if (tp->tty_break_off != NULL) (*tp->tty_break_off)(tp,0);
break;
case TIOCGWINSZ:
r = sys_safecopyto(endpt, grant, 0, (vir_bytes) &tp->tty_winsize,
sizeof(struct winsize));
break;
case TIOCSWINSZ:
r = sys_safecopyfrom(endpt, grant, 0, (vir_bytes) &tp->tty_winsize,
sizeof(struct winsize));
sigchar(tp, SIGWINCH, 0);
break;
case TIOCGETD: /* get line discipline */
i = TTYDISC;
r = sys_safecopyto(endpt, grant, 0, (vir_bytes) &i, sizeof(i));
break;
case TIOCSETD: /* set line discipline */
printf("TTY: TIOCSETD: can't set any other line discipline.\n");
r = ENOTTY;
break;
case TIOCGLINED: /* get line discipline as string */
r = sys_safecopyto(endpt, grant, 0, (vir_bytes) lined, sizeof(lined));
break;
case TIOCGQSIZE: /* get input/output queue sizes */
/* Not sure what to report here. We are using input and output queues
* of different sizes, and the IOCTL allows for one single value for
* both. So far this seems to be just for stty(1) so let's just report
* the larger of the two. TODO: revisit queue sizes altogether.
*/
i = MAX(TTY_IN_BYTES, TTY_OUT_BYTES);
r = sys_safecopyto(endpt, grant, 0, (vir_bytes) &i, sizeof(i));
break;
case TIOCSCTTY:
/* Process sets this tty as its controlling tty */
tp->tty_pgrp = user_endpt;
break;
/* These Posix functions are allowed to fail if _POSIX_JOB_CONTROL is
* not defined.
*/
case TIOCGPGRP:
case TIOCSPGRP:
default:
r = ENOTTY;
}
return r;
}
/*===========================================================================*
* do_open *
*===========================================================================*/
static int do_open(devminor_t minor, int access, endpoint_t user_endpt)
{
/* A tty line has been opened. Make it the callers controlling tty if
* CDEV_NOCTTY is *not* set and it is not the log device. CDEV_CTTY is returned
* if the tty is made the controlling tty, otherwise OK or an error code.
*/
tty_t *tp;
int r = OK;
if ((tp = line2tty(minor)) == NULL)
return ENXIO;
if (!(access & CDEV_NOCTTY)) {
tp->tty_pgrp = user_endpt;
r = CDEV_CTTY;
}
tp->tty_openct++;
if (tp->tty_openct == 1) {
/* Tell the device that the tty is opened */
(*tp->tty_open)(tp, 0);
}
return r;
}
/*===========================================================================*
* do_close *
*===========================================================================*/
static int do_close(devminor_t minor)
{
/* A tty line has been closed. Clean up the line if it is the last close. */
tty_t *tp;
if ((tp = line2tty(minor)) == NULL)
return ENXIO;
if (--tp->tty_openct == 0) {
tp->tty_pgrp = 0;
tty_icancel(tp);
(*tp->tty_ocancel)(tp, 0);
(*tp->tty_close)(tp, 0);
tp->tty_termios = termios_defaults;
tp->tty_winsize = winsize_defaults;
setattr(tp);
}
return OK;
}
/*===========================================================================*
* do_cancel *
*===========================================================================*/
static int do_cancel(devminor_t minor, endpoint_t endpt, cdev_id_t id)
{
/* A signal has been sent to a process that is hanging trying to read or write.
* The pending read or write must be finished off immediately.
*/
tty_t *tp;
int r;
if ((tp = line2tty(minor)) == NULL)
return ENXIO;
/* Check the parameters carefully, to avoid cancelling twice. */
r = EDONTREPLY;
if (tp->tty_inleft != 0 && endpt == tp->tty_incaller && id == tp->tty_inid) {
/* Process was reading when killed. Clean up input. */
tty_icancel(tp);
r = tp->tty_incum > 0 ? tp->tty_incum : EAGAIN;
tp->tty_inleft = tp->tty_incum = 0;
tp->tty_incaller = NONE;
} else if (tp->tty_outleft != 0 && endpt == tp->tty_outcaller &&
id == tp->tty_outid) {
/* Process was writing when killed. Clean up output. */
r = tp->tty_outcum > 0 ? tp->tty_outcum : EAGAIN;
tp->tty_outleft = tp->tty_outcum = 0;
tp->tty_outcaller = NONE;
} else if (tp->tty_ioreq != 0 && endpt == tp->tty_iocaller &&
id == tp->tty_ioid) {
/* Process was waiting for output to drain. */
r = EINTR;
tp->tty_ioreq = 0;
tp->tty_iocaller = NONE;
}
if (r != EDONTREPLY)
tp->tty_events = 1;
/* Only reply if we found a matching request. */
return r;
}
int select_try(struct tty *tp, int ops)
{
int ready_ops = 0;
/* Special case. If line is hung up, no operations will block.
* (and it can be seen as an exceptional condition.)
*/
if (tp->tty_termios.c_ospeed == B0) {
ready_ops |= ops;
}
if (ops & CDEV_OP_RD) {
/* will i/o not block on read? */
if (tp->tty_inleft > 0) {
ready_ops |= CDEV_OP_RD; /* EIO - no blocking */
} else if (tp->tty_incount > 0) {
/* Is a regular read possible? tty_incount
* says there is data. But a read will only succeed
* in canonical mode if a newline has been seen.
*/
if (!(tp->tty_termios.c_lflag & ICANON) ||
tp->tty_eotct > 0) {
ready_ops |= CDEV_OP_RD;
}
}
}
if (ops & CDEV_OP_WR) {
if (tp->tty_outleft > 0) ready_ops |= CDEV_OP_WR;
else if ((*tp->tty_devwrite)(tp, 1)) ready_ops |= CDEV_OP_WR;
}
return ready_ops;
}
int select_retry(struct tty *tp)
{
int ops;
if (tp->tty_select_ops && (ops = select_try(tp, tp->tty_select_ops))) {
chardriver_reply_select(tp->tty_select_proc,
tp->tty_select_minor, ops);
tp->tty_select_ops &= ~ops;
}
return OK;
}
/*===========================================================================*
* do_select *
*===========================================================================*/
static int do_select(devminor_t minor, unsigned int ops, endpoint_t endpt)
{
tty_t *tp;
int ready_ops, watch;
if ((tp = line2tty(minor)) == NULL)
return ENXIO;
watch = (ops & CDEV_NOTIFY);
ops &= (CDEV_OP_RD | CDEV_OP_WR | CDEV_OP_ERR);
ready_ops = select_try(tp, ops);
ops &= ~ready_ops;
if (ops && watch) {
/* Translated minor numbers are a problem with late select replies. We
* have to save the minor number used to do the select, since otherwise
* VFS won't be able to make sense of those late replies. We do not
* support selecting on two different minors for the same object.
*/
if (tp->tty_select_ops != 0 && tp->tty_select_minor != minor) {
printf("TTY: select on one object with two minors (%d, %d)\n",
tp->tty_select_minor, minor);
return EBADF;
}
tp->tty_select_ops |= ops;
tp->tty_select_proc = endpt;
tp->tty_select_minor = minor;
}
return ready_ops;
}
/*===========================================================================*
* handle_events *
*===========================================================================*/
void handle_events(tp)
tty_t *tp; /* TTY to check for events. */
{
/* Handle any events pending on a TTY. */
do {
tp->tty_events = 0;
/* Read input and perform input processing. */
(*tp->tty_devread)(tp, 0);
/* Perform output processing and write output. */
(*tp->tty_devwrite)(tp, 0);
/* Ioctl waiting for some event? */
if (tp->tty_ioreq != 0) dev_ioctl(tp);
} while (tp->tty_events);
/* Transfer characters from the input queue to a waiting process. */
in_transfer(tp);
/* Reply if enough bytes are available. */
if (tp->tty_incum >= tp->tty_min && tp->tty_inleft > 0) {
chardriver_reply_task(tp->tty_incaller, tp->tty_inid, tp->tty_incum);
tp->tty_inleft = tp->tty_incum = 0;
tp->tty_incaller = NONE;
}
if (tp->tty_select_ops)
{
select_retry(tp);
}
select_retry_pty(tp);
}
/*===========================================================================*
* in_transfer *
*===========================================================================*/
static void in_transfer(tp)
register tty_t *tp; /* pointer to terminal to read from */
{
/* Transfer bytes from the input queue to a process reading from a terminal. */
int ch;
int count;
char buf[64], *bp;
/* Force read to succeed if the line is hung up, looks like EOF to reader. */
if (tp->tty_termios.c_ospeed == B0) tp->tty_min = 0;
/* Anything to do? */
if (tp->tty_inleft == 0 || tp->tty_eotct < tp->tty_min) return;
bp = buf;
while (tp->tty_inleft > 0 && tp->tty_eotct > 0) {
ch = *tp->tty_intail;
if (!(ch & IN_EOF)) {
/* One character to be delivered to the user. */
*bp = ch & IN_CHAR;
tp->tty_inleft--;
if (++bp == bufend(buf)) {
/* Temp buffer full, copy to user space. */
sys_safecopyto(tp->tty_incaller,
tp->tty_ingrant, tp->tty_incum,
(vir_bytes) buf, (vir_bytes) buflen(buf));
tp->tty_incum += buflen(buf);
bp = buf;
}
}
/* Remove the character from the input queue. */
if (++tp->tty_intail == bufend(tp->tty_inbuf))
tp->tty_intail = tp->tty_inbuf;
tp->tty_incount--;
if (ch & IN_EOT) {
tp->tty_eotct--;
/* Don't read past a line break in canonical mode. */
if (tp->tty_termios.c_lflag & ICANON) tp->tty_inleft = 0;
}
}
if (bp > buf) {
/* Leftover characters in the buffer. */
count = bp - buf;
sys_safecopyto(tp->tty_incaller, tp->tty_ingrant, tp->tty_incum,
(vir_bytes) buf, (vir_bytes) count);
tp->tty_incum += count;
}
/* Usually reply to the reader, possibly even if incum == 0 (EOF). */
if (tp->tty_inleft == 0) {
chardriver_reply_task(tp->tty_incaller, tp->tty_inid, tp->tty_incum);
tp->tty_inleft = tp->tty_incum = 0;
tp->tty_incaller = NONE;
}
}
/*===========================================================================*
* in_process *
*===========================================================================*/
int in_process(tp, buf, count)
register tty_t *tp; /* terminal on which character has arrived */
char *buf; /* buffer with input characters */
int count; /* number of input characters */
{
/* Characters have just been typed in. Process, save, and echo them. Return
* the number of characters processed.
*/
int ch, sig, ct;
int timeset = FALSE;
for (ct = 0; ct < count; ct++) {
/* Take one character. */
ch = *buf++ & BYTE;
/* Strip to seven bits? */
if (tp->tty_termios.c_iflag & ISTRIP) ch &= 0x7F;
/* Input extensions? */
if (tp->tty_termios.c_lflag & IEXTEN) {
/* Previous character was a character escape? */
if (tp->tty_escaped) {
tp->tty_escaped = NOT_ESCAPED;
ch |= IN_ESC; /* protect character */
}
/* LNEXT (^V) to escape the next character? */
if (ch == tp->tty_termios.c_cc[VLNEXT]) {
tp->tty_escaped = ESCAPED;
rawecho(tp, '^');
rawecho(tp, '\b');
continue; /* do not store the escape */
}
/* REPRINT (^R) to reprint echoed characters? */
if (ch == tp->tty_termios.c_cc[VREPRINT]) {
reprint(tp);
continue;
}
}
/* _POSIX_VDISABLE is a normal character value, so better escape it. */
if (ch == _POSIX_VDISABLE) ch |= IN_ESC;
/* Map CR to LF, ignore CR, or map LF to CR. */
if (ch == '\r') {
if (tp->tty_termios.c_iflag & IGNCR) continue;
if (tp->tty_termios.c_iflag & ICRNL) ch = '\n';
} else
if (ch == '\n') {
if (tp->tty_termios.c_iflag & INLCR) ch = '\r';
}
/* Canonical mode? */
if (tp->tty_termios.c_lflag & ICANON) {
/* Erase processing (rub out of last character). */
if (ch == tp->tty_termios.c_cc[VERASE]) {
(void) back_over(tp);
if (!(tp->tty_termios.c_lflag & ECHOE)) {
(void) tty_echo(tp, ch);
}
continue;
}
/* Kill processing (remove current line). */
if (ch == tp->tty_termios.c_cc[VKILL]) {
while (back_over(tp)) {}
if (!(tp->tty_termios.c_lflag & ECHOE)) {
(void) tty_echo(tp, ch);
if (tp->tty_termios.c_lflag & ECHOK)
rawecho(tp, '\n');
}
continue;
}
/* EOF (^D) means end-of-file, an invisible "line break". */
if (ch == tp->tty_termios.c_cc[VEOF]) ch |= IN_EOT | IN_EOF;
/* The line may be returned to the user after an LF. */
if (ch == '\n') ch |= IN_EOT;
/* Same thing with EOL, whatever it may be. */
if (ch == tp->tty_termios.c_cc[VEOL]) ch |= IN_EOT;
}
/* Start/stop input control? */
if (tp->tty_termios.c_iflag & IXON) {
/* Output stops on STOP (^S). */
if (ch == tp->tty_termios.c_cc[VSTOP]) {
tp->tty_inhibited = STOPPED;
tp->tty_events = 1;
continue;
}
/* Output restarts on START (^Q) or any character if IXANY. */
if (tp->tty_inhibited) {
if (ch == tp->tty_termios.c_cc[VSTART]
|| (tp->tty_termios.c_iflag & IXANY)) {
tp->tty_inhibited = RUNNING;
tp->tty_events = 1;
if (ch == tp->tty_termios.c_cc[VSTART])
continue;
}
}
}
if (tp->tty_termios.c_lflag & ISIG) {
/* Check for INTR, QUIT and STATUS characters. */
int sig = -1;
if (ch == tp->tty_termios.c_cc[VINTR])
sig = SIGINT;
else if(ch == tp->tty_termios.c_cc[VQUIT])
sig = SIGQUIT;
else if(ch == tp->tty_termios.c_cc[VSTATUS])
sig = SIGINFO;
if(sig >= 0) {
sigchar(tp, sig, 1);
(void) tty_echo(tp, ch);
continue;
}
}
/* Is there space in the input buffer? */
if (tp->tty_incount == buflen(tp->tty_inbuf)) {
/* No space; discard in canonical mode, keep in raw mode. */
if (tp->tty_termios.c_lflag & ICANON) continue;
break;
}
if (!(tp->tty_termios.c_lflag & ICANON)) {
/* In raw mode all characters are "line breaks". */
ch |= IN_EOT;
/* Start an inter-byte timer? */
if (!timeset && tp->tty_termios.c_cc[VMIN] > 0
&& tp->tty_termios.c_cc[VTIME] > 0) {
settimer(tp, TRUE);
timeset = TRUE;
}
}
/* Perform the intricate function of echoing. */
if (tp->tty_termios.c_lflag & (ECHO|ECHONL)) ch = tty_echo(tp, ch);
/* Save the character in the input queue. */
*tp->tty_inhead++ = ch;
if (tp->tty_inhead == bufend(tp->tty_inbuf))
tp->tty_inhead = tp->tty_inbuf;
tp->tty_incount++;
if (ch & IN_EOT) tp->tty_eotct++;
/* Try to finish input if the queue threatens to overflow. */
if (tp->tty_incount == buflen(tp->tty_inbuf)) in_transfer(tp);
}
return ct;
}
/*===========================================================================*
* echo *
*===========================================================================*/
static int tty_echo(tp, ch)
register tty_t *tp; /* terminal on which to echo */
register int ch; /* pointer to character to echo */
{
/* Echo the character if echoing is on. Some control characters are echoed
* with their normal effect, other control characters are echoed as "^X",
* normal characters are echoed normally. EOF (^D) is echoed, but immediately
* backspaced over. Return the character with the echoed length added to its
* attributes.
*/
int len, rp;
ch &= ~IN_LEN;
if (!(tp->tty_termios.c_lflag & ECHO)) {
if (ch == ('\n' | IN_EOT) && (tp->tty_termios.c_lflag
& (ICANON|ECHONL)) == (ICANON|ECHONL))
(*tp->tty_echo)(tp, '\n');
return(ch);
}
/* "Reprint" tells if the echo output has been messed up by other output. */
rp = tp->tty_incount == 0 ? FALSE : tp->tty_reprint;
if ((ch & IN_CHAR) < ' ') {
switch (ch & (IN_ESC|IN_EOF|IN_EOT|IN_CHAR)) {
case '\t':
len = 0;
do {
(*tp->tty_echo)(tp, ' ');
len++;
} while (len < TAB_SIZE && (tp->tty_position & TAB_MASK) != 0);
break;
case '\r' | IN_EOT:
case '\n' | IN_EOT:
(*tp->tty_echo)(tp, ch & IN_CHAR);
len = 0;
break;
default:
(*tp->tty_echo)(tp, '^');
(*tp->tty_echo)(tp, '@' + (ch & IN_CHAR));
len = 2;
}
} else
if ((ch & IN_CHAR) == '\177') {
/* A DEL prints as "^?". */
(*tp->tty_echo)(tp, '^');
(*tp->tty_echo)(tp, '?');
len = 2;
} else {
(*tp->tty_echo)(tp, ch & IN_CHAR);
len = 1;
}
if (ch & IN_EOF) while (len > 0) { (*tp->tty_echo)(tp, '\b'); len--; }
tp->tty_reprint = rp;
return(ch | (len << IN_LSHIFT));
}
/*===========================================================================*
* rawecho *
*===========================================================================*/
static void rawecho(tp, ch)
register tty_t *tp;
int ch;
{
/* Echo without interpretation if ECHO is set. */
int rp = tp->tty_reprint;
if (tp->tty_termios.c_lflag & ECHO) (*tp->tty_echo)(tp, ch);
tp->tty_reprint = rp;
}
/*===========================================================================*
* back_over *
*===========================================================================*/
static int back_over(tp)
register tty_t *tp;
{
/* Backspace to previous character on screen and erase it. */
u16_t *head;
int len;
if (tp->tty_incount == 0) return(0); /* queue empty */
head = tp->tty_inhead;
if (head == tp->tty_inbuf) head = bufend(tp->tty_inbuf);
if (*--head & IN_EOT) return(0); /* can't erase "line breaks" */
if (tp->tty_reprint) reprint(tp); /* reprint if messed up */
tp->tty_inhead = head;
tp->tty_incount--;
if (tp->tty_termios.c_lflag & ECHOE) {
len = (*head & IN_LEN) >> IN_LSHIFT;
while (len > 0) {
rawecho(tp, '\b');
rawecho(tp, ' ');
rawecho(tp, '\b');
len--;
}
}
return(1); /* one character erased */
}
/*===========================================================================*
* reprint *
*===========================================================================*/
static void reprint(tp)
register tty_t *tp; /* pointer to tty struct */
{
/* Restore what has been echoed to screen before if the user input has been
* messed up by output, or if REPRINT (^R) is typed.
*/
int count;
u16_t *head;
tp->tty_reprint = FALSE;
/* Find the last line break in the input. */
head = tp->tty_inhead;
count = tp->tty_incount;
while (count > 0) {
if (head == tp->tty_inbuf) head = bufend(tp->tty_inbuf);
if (head[-1] & IN_EOT) break;
head--;
count--;
}
if (count == tp->tty_incount) return; /* no reason to reprint */
/* Show REPRINT (^R) and move to a new line. */
(void) tty_echo(tp, tp->tty_termios.c_cc[VREPRINT] | IN_ESC);
rawecho(tp, '\r');
rawecho(tp, '\n');
/* Reprint from the last break onwards. */
do {
if (head == bufend(tp->tty_inbuf)) head = tp->tty_inbuf;
*head = tty_echo(tp, *head);
head++;
count++;
} while (count < tp->tty_incount);
}
/*===========================================================================*
* out_process *
*===========================================================================*/
void out_process(tp, bstart, bpos, bend, icount, ocount)
tty_t *tp;
char *bstart, *bpos, *bend; /* start/pos/end of circular buffer */
int *icount; /* # input chars / input chars used */
int *ocount; /* max output chars / output chars used */
{
/* Perform output processing on a circular buffer. *icount is the number of
* bytes to process, and the number of bytes actually processed on return.
* *ocount is the space available on input and the space used on output.
* (Naturally *icount < *ocount.) The column position is updated modulo
* the TAB size, because we really only need it for tabs.
*/
int tablen;
int ict = *icount;
int oct = *ocount;
int pos = tp->tty_position;
while (ict > 0) {
switch (*bpos) {
case '\7':
break;
case '\b':
pos--;
break;
case '\r':
pos = 0;
break;
case '\n':
if ((tp->tty_termios.c_oflag & (OPOST|ONLCR))
== (OPOST|ONLCR)) {
/* Map LF to CR+LF if there is space. Note that the
* next character in the buffer is overwritten, so
* we stop at this point.
*/
if (oct >= 2) {
*bpos = '\r';
if (++bpos == bend) bpos = bstart;
*bpos = '\n';
pos = 0;
ict--;
oct -= 2;
}
goto out_done; /* no space or buffer got changed */
}
break;
case '\t':
/* Best guess for the tab length. */
tablen = TAB_SIZE - (pos & TAB_MASK);
if ((tp->tty_termios.c_oflag & (OPOST|OXTABS))
== (OPOST|OXTABS)) {
/* Tabs must be expanded. */
if (oct >= tablen) {
pos += tablen;
ict--;
oct -= tablen;
do {
*bpos = ' ';
if (++bpos == bend) bpos = bstart;
} while (--tablen != 0);
}
goto out_done;
}
/* Tabs are output directly. */
pos += tablen;
break;
default:
/* Assume any other character prints as one character. */
pos++;
}
if (++bpos == bend) bpos = bstart;
ict--;
oct--;
}
out_done:
tp->tty_position = pos & TAB_MASK;
*icount -= ict; /* [io]ct are the number of chars not used */
*ocount -= oct; /* *[io]count are the number of chars that are used */
}
/*===========================================================================*
* dev_ioctl *
*===========================================================================*/
static void dev_ioctl(tp)
tty_t *tp;
{
/* The ioctl's TCSETSW, TCSETSF and TIOCDRAIN wait for output to finish to make
* sure that an attribute change doesn't affect the processing of current
* output. Once output finishes the ioctl is executed as in do_ioctl().
*/
int result = EINVAL;
if (tp->tty_outleft > 0) return; /* output not finished */
if (tp->tty_ioreq != TIOCDRAIN) {
if (tp->tty_ioreq == TIOCSETAF) tty_icancel(tp);
result = sys_safecopyfrom(tp->tty_iocaller, tp->tty_iogrant, 0,
(vir_bytes) &tp->tty_termios,
(vir_bytes) sizeof(tp->tty_termios));
if (result == OK) setattr(tp);
}
tp->tty_ioreq = 0;
chardriver_reply_task(tp->tty_iocaller, tp->tty_ioid, result);
tp->tty_iocaller = NONE;
}
/*===========================================================================*
* setattr *
*===========================================================================*/
static void setattr(tp)
tty_t *tp;
{
/* Apply the new line attributes (raw/canonical, line speed, etc.) */
u16_t *inp;
int count;
if (!(tp->tty_termios.c_lflag & ICANON)) {
/* Raw mode; put a "line break" on all characters in the input queue.
* It is undefined what happens to the input queue when ICANON is
* switched off, a process should use TCSAFLUSH to flush the queue.
* Keeping the queue to preserve typeahead is the Right Thing, however
* when a process does use TCSANOW to switch to raw mode.
*/
count = tp->tty_eotct = tp->tty_incount;
inp = tp->tty_intail;
while (count > 0) {
*inp |= IN_EOT;
if (++inp == bufend(tp->tty_inbuf)) inp = tp->tty_inbuf;
--count;
}
}
/* Inspect MIN and TIME. */
settimer(tp, FALSE);
if (tp->tty_termios.c_lflag & ICANON) {
/* No MIN & TIME in canonical mode. */
tp->tty_min = 1;
} else {
/* In raw mode MIN is the number of chars wanted, and TIME how long
* to wait for them. With interesting exceptions if either is zero.
*/
tp->tty_min = tp->tty_termios.c_cc[VMIN];
if (tp->tty_min == 0 && tp->tty_termios.c_cc[VTIME] > 0)
tp->tty_min = 1;
}
if (!(tp->tty_termios.c_iflag & IXON)) {
/* No start/stop output control, so don't leave output inhibited. */
tp->tty_inhibited = RUNNING;
tp->tty_events = 1;
}
/* Setting the output speed to zero hangs up the phone. */
if (tp->tty_termios.c_ospeed == B0) sigchar(tp, SIGHUP, 1);
/* Set new line speed, character size, etc at the device level. */
(*tp->tty_ioctl)(tp, 0);
}
/*===========================================================================*
* sigchar *
*===========================================================================*/
void sigchar(tp, sig, mayflush)
register tty_t *tp;
int sig; /* SIGINT, SIGQUIT, SIGKILL or SIGHUP */
int mayflush;
{
/* Process a SIGINT, SIGQUIT or SIGKILL char from the keyboard or SIGHUP from
* a tty close, "stty 0", or a real RS-232 hangup. PM will send the signal to
* the process group (INT, QUIT), all processes (KILL), or the session leader
* (HUP).
*/
int status;
if (tp->tty_pgrp != 0) {
if (OK != (status = sys_kill(tp->tty_pgrp, sig))) {
panic("Error; call to sys_kill failed: %d", status);
}
}
if (mayflush && !(tp->tty_termios.c_lflag & NOFLSH)) {
tp->tty_incount = tp->tty_eotct = 0; /* kill earlier input */
tp->tty_intail = tp->tty_inhead;
(*tp->tty_ocancel)(tp, 0); /* kill all output */
tp->tty_inhibited = RUNNING;
tp->tty_events = 1;
}
}
/*===========================================================================*
* tty_icancel *
*===========================================================================*/
static void tty_icancel(tp)
register tty_t *tp;
{
/* Discard all pending input, tty buffer or device. */
tp->tty_incount = tp->tty_eotct = 0;
tp->tty_intail = tp->tty_inhead;
(*tp->tty_icancel)(tp, 0);
}
/*===========================================================================*
* tty_devnop *
*===========================================================================*/
static int tty_devnop(tty_t *UNUSED(tp), int UNUSED(try))
{
/* Some functions need not be implemented at the device level. */
return 0;
}
/*===========================================================================*
* tty_init *
*===========================================================================*/
static int tty_init(int UNUSED(type), sef_init_info_t *UNUSED(info))
{
/* Initialize tty structure and call device initialization routines. */
register tty_t *tp;
int s;
system_hz = sys_hz();
/* Initialize the terminal lines. */
memset(tty_table, '\0' , sizeof(tty_table));
for (tp = FIRST_TTY,s=0; tp < END_TTY; tp++,s++) {
tp->tty_index = s;
init_timer(&tp->tty_tmr);
tp->tty_intail = tp->tty_inhead = tp->tty_inbuf;
tp->tty_min = 1;
tp->tty_incaller = tp->tty_outcaller = tp->tty_iocaller = NONE;
tp->tty_termios = termios_defaults;
tp->tty_icancel = tp->tty_ocancel = tp->tty_ioctl = tp->tty_close =
tp->tty_open = tty_devnop;
pty_init(tp);
tp->tty_minor = s + TTYPX_MINOR;
}
return OK;
}
/*===========================================================================*
* tty_timed_out *
*===========================================================================*/
static void tty_timed_out(minix_timer_t *tp)
{
/* This timer has expired. Set the events flag, to force processing. */
tty_t *tty_ptr;
tty_ptr = &tty_table[tmr_arg(tp)->ta_int];
tty_ptr->tty_min = 0; /* force read to succeed */
tty_ptr->tty_events = 1;
}
/*===========================================================================*
* settimer *
*===========================================================================*/
static void settimer(tty_ptr, enable)
tty_t *tty_ptr; /* line to set or unset a timer on */
int enable; /* set timer if true, otherwise unset */
{
clock_t ticks;
if (enable) {
ticks = tty_ptr->tty_termios.c_cc[VTIME] * (system_hz/10);
/* Set a new timer for enabling the TTY events flags. */
set_timer(&tty_ptr->tty_tmr, ticks, tty_timed_out, tty_ptr->tty_index);
} else {
/* Remove the timer from the active and expired lists. */
cancel_timer(&tty_ptr->tty_tmr);
}
}
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