source: branches/minix3-book/drivers/tty/tty.c@ 23

Last change on this file since 23 was 4, checked in by Mattia Monga, 14 years ago

Importazione sorgenti libro
File size: 48.1 KB
RevLine 
[4]1/* This file contains the terminal driver, both for the IBM console and regular
2 * ASCII terminals. It handles only the device-independent part of a TTY, the
3 * device dependent parts are in console.c, rs232.c, etc. This file contains
4 * two main entry points, tty_task() and tty_wakeup(), and several minor entry
5 * points for use by the device-dependent code.
6 *
7 * The device-independent part accepts "keyboard" input from the device-
8 * dependent part, performs input processing (special key interpretation),
9 * and sends the input to a process reading from the TTY. Output to a TTY
10 * is sent to the device-dependent code for output processing and "screen"
11 * display. Input processing is done by the device by calling 'in_process'
12 * on the input characters, output processing may be done by the device itself
13 * or by calling 'out_process'. The TTY takes care of input queuing, the
14 * device does the output queuing. If a device receives an external signal,
15 * like an interrupt, then it causes tty_wakeup() to be run by the CLOCK task
16 * to, you guessed it, wake up the TTY to check if input or output can
17 * continue.
18 *
19 * The valid messages and their parameters are:
20 *
21 * HARD_INT: output has been completed or input has arrived
22 * SYS_SIG: e.g., MINIX wants to shutdown; run code to cleanly stop
23 * DEV_READ: a process wants to read from a terminal
24 * DEV_WRITE: a process wants to write on a terminal
25 * DEV_IOCTL: a process wants to change a terminal's parameters
26 * DEV_OPEN: a tty line has been opened
27 * DEV_CLOSE: a tty line has been closed
28 * DEV_SELECT: start select notification request
29 * DEV_STATUS: FS wants to know status for SELECT or REVIVE
30 * CANCEL: terminate a previous incomplete system call immediately
31 *
32 * m_type TTY_LINE PROC_NR COUNT TTY_SPEK TTY_FLAGS ADDRESS
33 * ---------------------------------------------------------------------------
34 * | HARD_INT | | | | | | |
35 * |-------------+---------+---------+---------+---------+---------+---------|
36 * | SYS_SIG | sig set | | | | | |
37 * |-------------+---------+---------+---------+---------+---------+---------|
38 * | DEV_READ |minor dev| proc nr | count | O_NONBLOCK| buf ptr |
39 * |-------------+---------+---------+---------+---------+---------+---------|
40 * | DEV_WRITE |minor dev| proc nr | count | | | buf ptr |
41 * |-------------+---------+---------+---------+---------+---------+---------|
42 * | DEV_IOCTL |minor dev| proc nr |func code|erase etc| flags | |
43 * |-------------+---------+---------+---------+---------+---------+---------|
44 * | DEV_OPEN |minor dev| proc nr | O_NOCTTY| | | |
45 * |-------------+---------+---------+---------+---------+---------+---------|
46 * | DEV_CLOSE |minor dev| proc nr | | | | |
47 * |-------------+---------+---------+---------+---------+---------+---------|
48 * | DEV_STATUS | | | | | | |
49 * |-------------+---------+---------+---------+---------+---------+---------|
50 * | CANCEL |minor dev| proc nr | | | | |
51 * ---------------------------------------------------------------------------
52 *
53 * Changes:
54 * Jan 20, 2004 moved TTY driver to user-space (Jorrit N. Herder)
55 * Sep 20, 2004 local timer management/ sync alarms (Jorrit N. Herder)
56 * Jul 13, 2004 support for function key observers (Jorrit N. Herder)
57 */
58
59#include "../drivers.h"
60#include "../drivers.h"
61#include <termios.h>
62#include <sys/ioc_tty.h>
63#include <signal.h>
64#include <minix/callnr.h>
65#include <minix/keymap.h>
66#include "tty.h"
67
68#include <sys/time.h>
69#include <sys/select.h>
70
71extern int irq_hook_id;
72
73unsigned long kbd_irq_set = 0;
74unsigned long rs_irq_set = 0;
75
76/* Address of a tty structure. */
77#define tty_addr(line) (&tty_table[line])
78
79/* Macros for magic tty types. */
80#define isconsole(tp) ((tp) < tty_addr(NR_CONS))
81#define ispty(tp) ((tp) >= tty_addr(NR_CONS+NR_RS_LINES))
82
83/* Macros for magic tty structure pointers. */
84#define FIRST_TTY tty_addr(0)
85#define END_TTY tty_addr(sizeof(tty_table) / sizeof(tty_table[0]))
86
87/* A device exists if at least its 'devread' function is defined. */
88#define tty_active(tp) ((tp)->tty_devread != NULL)
89
90/* RS232 lines or pseudo terminals can be completely configured out. */
91#if NR_RS_LINES == 0
92#define rs_init(tp) ((void) 0)
93#endif
94#if NR_PTYS == 0
95#define pty_init(tp) ((void) 0)
96#define do_pty(tp, mp) ((void) 0)
97#endif
98
99FORWARD _PROTOTYPE( void tty_timed_out, (timer_t *tp) );
100FORWARD _PROTOTYPE( void expire_timers, (void) );
101FORWARD _PROTOTYPE( void settimer, (tty_t *tty_ptr, int enable) );
102FORWARD _PROTOTYPE( void do_cancel, (tty_t *tp, message *m_ptr) );
103FORWARD _PROTOTYPE( void do_ioctl, (tty_t *tp, message *m_ptr) );
104FORWARD _PROTOTYPE( void do_open, (tty_t *tp, message *m_ptr) );
105FORWARD _PROTOTYPE( void do_close, (tty_t *tp, message *m_ptr) );
106FORWARD _PROTOTYPE( void do_read, (tty_t *tp, message *m_ptr) );
107FORWARD _PROTOTYPE( void do_write, (tty_t *tp, message *m_ptr) );
108FORWARD _PROTOTYPE( void do_select, (tty_t *tp, message *m_ptr) );
109FORWARD _PROTOTYPE( void do_status, (message *m_ptr) );
110FORWARD _PROTOTYPE( void in_transfer, (tty_t *tp) );
111FORWARD _PROTOTYPE( int tty_echo, (tty_t *tp, int ch) );
112FORWARD _PROTOTYPE( void rawecho, (tty_t *tp, int ch) );
113FORWARD _PROTOTYPE( int back_over, (tty_t *tp) );
114FORWARD _PROTOTYPE( void reprint, (tty_t *tp) );
115FORWARD _PROTOTYPE( void dev_ioctl, (tty_t *tp) );
116FORWARD _PROTOTYPE( void setattr, (tty_t *tp) );
117FORWARD _PROTOTYPE( void tty_icancel, (tty_t *tp) );
118FORWARD _PROTOTYPE( void tty_init, (void) );
119
120/* Default attributes. */
121PRIVATE struct termios termios_defaults = {
122 TINPUT_DEF, TOUTPUT_DEF, TCTRL_DEF, TLOCAL_DEF, TSPEED_DEF, TSPEED_DEF,
123 {
124 TEOF_DEF, TEOL_DEF, TERASE_DEF, TINTR_DEF, TKILL_DEF, TMIN_DEF,
125 TQUIT_DEF, TTIME_DEF, TSUSP_DEF, TSTART_DEF, TSTOP_DEF,
126 TREPRINT_DEF, TLNEXT_DEF, TDISCARD_DEF,
127 },
128};
129PRIVATE struct winsize winsize_defaults; /* = all zeroes */
130
131/* Global variables for the TTY task (declared extern in tty.h). */
132PUBLIC tty_t tty_table[NR_CONS+NR_RS_LINES+NR_PTYS];
133PUBLIC int ccurrent; /* currently active console */
134PUBLIC timer_t *tty_timers; /* queue of TTY timers */
135PUBLIC clock_t tty_next_timeout; /* time that the next alarm is due */
136PUBLIC struct machine machine; /* kernel environment variables */
137
138/*===========================================================================*
139 * tty_task *
140 *===========================================================================*/
141PUBLIC void main(void)
142{
143/* Main routine of the terminal task. */
144
145 message tty_mess; /* buffer for all incoming messages */
146 unsigned line;
147 int s;
148 char *types[] = {"task","driver","server", "user"};
149 register struct proc *rp;
150 register tty_t *tp;
151
152 /* Initialize the TTY driver. */
153 tty_init();
154
155 /* Get kernel environment (protected_mode, pc_at and ega are needed). */
156 if (OK != (s=sys_getmachine(&machine))) {
157 panic("TTY","Couldn't obtain kernel environment.", s);
158 }
159
160 /* Final one-time keyboard initialization. */
161 kb_init_once();
162
163 printf("\n");
164
165 while (TRUE) {
166
167 /* Check for and handle any events on any of the ttys. */
168 for (tp = FIRST_TTY; tp < END_TTY; tp++) {
169 if (tp->tty_events) handle_events(tp);
170 }
171
172 /* Get a request message. */
173 receive(ANY, &tty_mess);
174
175 /* First handle all kernel notification types that the TTY supports.
176 * - An alarm went off, expire all timers and handle the events.
177 * - A hardware interrupt also is an invitation to check for events.
178 * - A new kernel message is available for printing.
179 * - Reset the console on system shutdown.
180 * Then see if this message is different from a normal device driver
181 * request and should be handled separately. These extra functions
182 * do not operate on a device, in constrast to the driver requests.
183 */
184 switch (tty_mess.m_type) {
185 case SYN_ALARM: /* fall through */
186 expire_timers(); /* run watchdogs of expired timers */
187 continue; /* contine to check for events */
188 case HARD_INT: { /* hardware interrupt notification */
189 if (tty_mess.NOTIFY_ARG & kbd_irq_set)
190 kbd_interrupt(&tty_mess);/* fetch chars from keyboard */
191#if NR_RS_LINES > 0
192 if (tty_mess.NOTIFY_ARG & rs_irq_set)
193 rs_interrupt(&tty_mess);/* serial I/O */
194#endif
195 expire_timers(); /* run watchdogs of expired timers */
196 continue; /* contine to check for events */
197 }
198 case SYS_SIG: { /* system signal */
199 sigset_t sigset = (sigset_t) tty_mess.NOTIFY_ARG;
200
201 if (sigismember(&sigset, SIGKSTOP)) {
202 cons_stop(); /* switch to primary console */
203 if (irq_hook_id != -1) {
204 sys_irqdisable(&irq_hook_id);
205 sys_irqrmpolicy(KEYBOARD_IRQ, &irq_hook_id);
206 }
207 }
208 if (sigismember(&sigset, SIGTERM)) cons_stop();
209 if (sigismember(&sigset, SIGKMESS)) do_new_kmess(&tty_mess);
210 continue;
211 }
212 case PANIC_DUMPS: /* allow panic dumps */
213 cons_stop(); /* switch to primary console */
214 do_panic_dumps(&tty_mess);
215 continue;
216 case DIAGNOSTICS: /* a server wants to print some */
217 do_diagnostics(&tty_mess);
218 continue;
219 case FKEY_CONTROL: /* (un)register a fkey observer */
220 do_fkey_ctl(&tty_mess);
221 continue;
222 default: /* should be a driver request */
223 ; /* do nothing; end switch */
224 }
225
226 /* Only device requests should get to this point. All requests,
227 * except DEV_STATUS, have a minor device number. Check this
228 * exception and get the minor device number otherwise.
229 */
230 if (tty_mess.m_type == DEV_STATUS) {
231 do_status(&tty_mess);
232 continue;
233 }
234 line = tty_mess.TTY_LINE;
235 if ((line - CONS_MINOR) < NR_CONS) {
236 tp = tty_addr(line - CONS_MINOR);
237 } else if (line == LOG_MINOR) {
238 tp = tty_addr(0);
239 } else if ((line - RS232_MINOR) < NR_RS_LINES) {
240 tp = tty_addr(line - RS232_MINOR + NR_CONS);
241 } else if ((line - TTYPX_MINOR) < NR_PTYS) {
242 tp = tty_addr(line - TTYPX_MINOR + NR_CONS + NR_RS_LINES);
243 } else if ((line - PTYPX_MINOR) < NR_PTYS) {
244 tp = tty_addr(line - PTYPX_MINOR + NR_CONS + NR_RS_LINES);
245 if (tty_mess.m_type != DEV_IOCTL) {
246 do_pty(tp, &tty_mess);
247 continue;
248 }
249 } else {
250 tp = NULL;
251 }
252
253 /* If the device doesn't exist or is not configured return ENXIO. */
254 if (tp == NULL || ! tty_active(tp)) {
255 printf("Warning, TTY got illegal request %d from %d\n",
256 tty_mess.m_type, tty_mess.m_source);
257 tty_reply(TASK_REPLY, tty_mess.m_source,
258 tty_mess.PROC_NR, ENXIO);
259 continue;
260 }
261
262 /* Execute the requested device driver function. */
263 switch (tty_mess.m_type) {
264 case DEV_READ: do_read(tp, &tty_mess); break;
265 case DEV_WRITE: do_write(tp, &tty_mess); break;
266 case DEV_IOCTL: do_ioctl(tp, &tty_mess); break;
267 case DEV_OPEN: do_open(tp, &tty_mess); break;
268 case DEV_CLOSE: do_close(tp, &tty_mess); break;
269 case DEV_SELECT: do_select(tp, &tty_mess); break;
270 case CANCEL: do_cancel(tp, &tty_mess); break;
271 default:
272 printf("Warning, TTY got unexpected request %d from %d\n",
273 tty_mess.m_type, tty_mess.m_source);
274 tty_reply(TASK_REPLY, tty_mess.m_source,
275 tty_mess.PROC_NR, EINVAL);
276 }
277 }
278}
279
280/*===========================================================================*
281 * do_status *
282 *===========================================================================*/
283PRIVATE void do_status(m_ptr)
284message *m_ptr;
285{
286 register struct tty *tp;
287 int event_found;
288 int status;
289 int ops;
290
291 /* Check for select or revive events on any of the ttys. If we found an,
292 * event return a single status message for it. The FS will make another
293 * call to see if there is more.
294 */
295 event_found = 0;
296 for (tp = FIRST_TTY; tp < END_TTY; tp++) {
297 if ((ops = select_try(tp, tp->tty_select_ops)) &&
298 tp->tty_select_proc == m_ptr->m_source) {
299
300 /* I/O for a selected minor device is ready. */
301 m_ptr->m_type = DEV_IO_READY;
302 m_ptr->DEV_MINOR = tp->tty_index;
303 m_ptr->DEV_SEL_OPS = ops;
304
305 tp->tty_select_ops &= ~ops; /* unmark select event */
306 event_found = 1;
307 break;
308 }
309 else if (tp->tty_inrevived && tp->tty_incaller == m_ptr->m_source) {
310
311 /* Suspended request finished. Send a REVIVE. */
312 m_ptr->m_type = DEV_REVIVE;
313 m_ptr->REP_PROC_NR = tp->tty_inproc;
314 m_ptr->REP_STATUS = tp->tty_incum;
315
316 tp->tty_inleft = tp->tty_incum = 0;
317 tp->tty_inrevived = 0; /* unmark revive event */
318 event_found = 1;
319 break;
320 }
321 else if (tp->tty_outrevived && tp->tty_outcaller == m_ptr->m_source) {
322
323 /* Suspended request finished. Send a REVIVE. */
324 m_ptr->m_type = DEV_REVIVE;
325 m_ptr->REP_PROC_NR = tp->tty_outproc;
326 m_ptr->REP_STATUS = tp->tty_outcum;
327
328 tp->tty_outcum = 0;
329 tp->tty_outrevived = 0; /* unmark revive event */
330 event_found = 1;
331 break;
332 }
333 }
334
335#if NR_PTYS > 0
336 if (!event_found)
337 event_found = pty_status(m_ptr);
338#endif
339
340 if (! event_found) {
341 /* No events of interest were found. Return an empty message. */
342 m_ptr->m_type = DEV_NO_STATUS;
343 }
344
345 /* Almost done. Send back the reply message to the caller. */
346 if ((status = send(m_ptr->m_source, m_ptr)) != OK) {
347 panic("TTY","send in do_status failed, status\n", status);
348 }
349}
350
351/*===========================================================================*
352 * do_read *
353 *===========================================================================*/
354PRIVATE void do_read(tp, m_ptr)
355register tty_t *tp; /* pointer to tty struct */
356register message *m_ptr; /* pointer to message sent to the task */
357{
358/* A process wants to read from a terminal. */
359 int r, status;
360 phys_bytes phys_addr;
361
362 /* Check if there is already a process hanging in a read, check if the
363 * parameters are correct, do I/O.
364 */
365 if (tp->tty_inleft > 0) {
366 r = EIO;
367 } else
368 if (m_ptr->COUNT <= 0) {
369 r = EINVAL;
370 } else
371 if (sys_umap(m_ptr->PROC_NR, D, (vir_bytes) m_ptr->ADDRESS, m_ptr->COUNT,
372 &phys_addr) != OK) {
373 r = EFAULT;
374 } else {
375 /* Copy information from the message to the tty struct. */
376 tp->tty_inrepcode = TASK_REPLY;
377 tp->tty_incaller = m_ptr->m_source;
378 tp->tty_inproc = m_ptr->PROC_NR;
379 tp->tty_in_vir = (vir_bytes) m_ptr->ADDRESS;
380 tp->tty_inleft = m_ptr->COUNT;
381
382 if (!(tp->tty_termios.c_lflag & ICANON)
383 && tp->tty_termios.c_cc[VTIME] > 0) {
384 if (tp->tty_termios.c_cc[VMIN] == 0) {
385 /* MIN & TIME specify a read timer that finishes the
386 * read in TIME/10 seconds if no bytes are available.
387 */
388 settimer(tp, TRUE);
389 tp->tty_min = 1;
390 } else {
391 /* MIN & TIME specify an inter-byte timer that may
392 * have to be cancelled if there are no bytes yet.
393 */
394 if (tp->tty_eotct == 0) {
395 settimer(tp, FALSE);
396 tp->tty_min = tp->tty_termios.c_cc[VMIN];
397 }
398 }
399 }
400
401 /* Anything waiting in the input buffer? Clear it out... */
402 in_transfer(tp);
403 /* ...then go back for more. */
404 handle_events(tp);
405 if (tp->tty_inleft == 0) {
406 if (tp->tty_select_ops)
407 select_retry(tp);
408 return; /* already done */
409 }
410
411 /* There were no bytes in the input queue available, so either suspend
412 * the caller or break off the read if nonblocking.
413 */
414 if (m_ptr->TTY_FLAGS & O_NONBLOCK) {
415 r = EAGAIN; /* cancel the read */
416 tp->tty_inleft = tp->tty_incum = 0;
417 } else {
418 r = SUSPEND; /* suspend the caller */
419 tp->tty_inrepcode = REVIVE;
420 }
421 }
422 tty_reply(TASK_REPLY, m_ptr->m_source, m_ptr->PROC_NR, r);
423 if (tp->tty_select_ops)
424 select_retry(tp);
425}
426
427/*===========================================================================*
428 * do_write *
429 *===========================================================================*/
430PRIVATE void do_write(tp, m_ptr)
431register tty_t *tp;
432register message *m_ptr; /* pointer to message sent to the task */
433{
434/* A process wants to write on a terminal. */
435 int r;
436 phys_bytes phys_addr;
437
438 /* Check if there is already a process hanging in a write, check if the
439 * parameters are correct, do I/O.
440 */
441 if (tp->tty_outleft > 0) {
442 r = EIO;
443 } else
444 if (m_ptr->COUNT <= 0) {
445 r = EINVAL;
446 } else
447 if (sys_umap(m_ptr->PROC_NR, D, (vir_bytes) m_ptr->ADDRESS, m_ptr->COUNT,
448 &phys_addr) != OK) {
449 r = EFAULT;
450 } else {
451 /* Copy message parameters to the tty structure. */
452 tp->tty_outrepcode = TASK_REPLY;
453 tp->tty_outcaller = m_ptr->m_source;
454 tp->tty_outproc = m_ptr->PROC_NR;
455 tp->tty_out_vir = (vir_bytes) m_ptr->ADDRESS;
456 tp->tty_outleft = m_ptr->COUNT;
457
458 /* Try to write. */
459 handle_events(tp);
460 if (tp->tty_outleft == 0)
461 return; /* already done */
462
463 /* None or not all the bytes could be written, so either suspend the
464 * caller or break off the write if nonblocking.
465 */
466 if (m_ptr->TTY_FLAGS & O_NONBLOCK) { /* cancel the write */
467 r = tp->tty_outcum > 0 ? tp->tty_outcum : EAGAIN;
468 tp->tty_outleft = tp->tty_outcum = 0;
469 } else {
470 r = SUSPEND; /* suspend the caller */
471 tp->tty_outrepcode = REVIVE;
472 }
473 }
474 tty_reply(TASK_REPLY, m_ptr->m_source, m_ptr->PROC_NR, r);
475}
476
477/*===========================================================================*
478 * do_ioctl *
479 *===========================================================================*/
480PRIVATE void do_ioctl(tp, m_ptr)
481register tty_t *tp;
482message *m_ptr; /* pointer to message sent to task */
483{
484/* Perform an IOCTL on this terminal. Posix termios calls are handled
485 * by the IOCTL system call
486 */
487
488 int r;
489 union {
490 int i;
491 } param;
492 size_t size;
493
494 /* Size of the ioctl parameter. */
495 switch (m_ptr->TTY_REQUEST) {
496 case TCGETS: /* Posix tcgetattr function */
497 case TCSETS: /* Posix tcsetattr function, TCSANOW option */
498 case TCSETSW: /* Posix tcsetattr function, TCSADRAIN option */
499 case TCSETSF: /* Posix tcsetattr function, TCSAFLUSH option */
500 size = sizeof(struct termios);
501 break;
502
503 case TCSBRK: /* Posix tcsendbreak function */
504 case TCFLOW: /* Posix tcflow function */
505 case TCFLSH: /* Posix tcflush function */
506 case TIOCGPGRP: /* Posix tcgetpgrp function */
507 case TIOCSPGRP: /* Posix tcsetpgrp function */
508 size = sizeof(int);
509 break;
510
511 case TIOCGWINSZ: /* get window size (not Posix) */
512 case TIOCSWINSZ: /* set window size (not Posix) */
513 size = sizeof(struct winsize);
514 break;
515
516 case KIOCSMAP: /* load keymap (Minix extension) */
517 size = sizeof(keymap_t);
518 break;
519
520 case TIOCSFON: /* load font (Minix extension) */
521 size = sizeof(u8_t [8192]);
522 break;
523
524 case TCDRAIN: /* Posix tcdrain function -- no parameter */
525 default: size = 0;
526 }
527
528 r = OK;
529 switch (m_ptr->TTY_REQUEST) {
530 case TCGETS:
531 /* Get the termios attributes. */
532 r = sys_vircopy(SELF, D, (vir_bytes) &tp->tty_termios,
533 m_ptr->PROC_NR, D, (vir_bytes) m_ptr->ADDRESS,
534 (vir_bytes) size);
535 break;
536
537 case TCSETSW:
538 case TCSETSF:
539 case TCDRAIN:
540 if (tp->tty_outleft > 0) {
541 /* Wait for all ongoing output processing to finish. */
542 tp->tty_iocaller = m_ptr->m_source;
543 tp->tty_ioproc = m_ptr->PROC_NR;
544 tp->tty_ioreq = m_ptr->REQUEST;
545 tp->tty_iovir = (vir_bytes) m_ptr->ADDRESS;
546 r = SUSPEND;
547 break;
548 }
549 if (m_ptr->TTY_REQUEST == TCDRAIN) break;
550 if (m_ptr->TTY_REQUEST == TCSETSF) tty_icancel(tp);
551 /*FALL THROUGH*/
552 case TCSETS:
553 /* Set the termios attributes. */
554 r = sys_vircopy( m_ptr->PROC_NR, D, (vir_bytes) m_ptr->ADDRESS,
555 SELF, D, (vir_bytes) &tp->tty_termios, (vir_bytes) size);
556 if (r != OK) break;
557 setattr(tp);
558 break;
559
560 case TCFLSH:
561 r = sys_vircopy( m_ptr->PROC_NR, D, (vir_bytes) m_ptr->ADDRESS,
562 SELF, D, (vir_bytes) &param.i, (vir_bytes) size);
563 if (r != OK) break;
564 switch (param.i) {
565 case TCIFLUSH: tty_icancel(tp); break;
566 case TCOFLUSH: (*tp->tty_ocancel)(tp, 0); break;
567 case TCIOFLUSH: tty_icancel(tp); (*tp->tty_ocancel)(tp, 0); break;
568 default: r = EINVAL;
569 }
570 break;
571
572 case TCFLOW:
573 r = sys_vircopy( m_ptr->PROC_NR, D, (vir_bytes) m_ptr->ADDRESS,
574 SELF, D, (vir_bytes) &param.i, (vir_bytes) size);
575 if (r != OK) break;
576 switch (param.i) {
577 case TCOOFF:
578 case TCOON:
579 tp->tty_inhibited = (param.i == TCOOFF);
580 tp->tty_events = 1;
581 break;
582 case TCIOFF:
583 (*tp->tty_echo)(tp, tp->tty_termios.c_cc[VSTOP]);
584 break;
585 case TCION:
586 (*tp->tty_echo)(tp, tp->tty_termios.c_cc[VSTART]);
587 break;
588 default:
589 r = EINVAL;
590 }
591 break;
592
593 case TCSBRK:
594 if (tp->tty_break != NULL) (*tp->tty_break)(tp,0);
595 break;
596
597 case TIOCGWINSZ:
598 r = sys_vircopy(SELF, D, (vir_bytes) &tp->tty_winsize,
599 m_ptr->PROC_NR, D, (vir_bytes) m_ptr->ADDRESS,
600 (vir_bytes) size);
601 break;
602
603 case TIOCSWINSZ:
604 r = sys_vircopy( m_ptr->PROC_NR, D, (vir_bytes) m_ptr->ADDRESS,
605 SELF, D, (vir_bytes) &tp->tty_winsize, (vir_bytes) size);
606 /* SIGWINCH... */
607 break;
608
609 case KIOCSMAP:
610 /* Load a new keymap (only /dev/console). */
611 if (isconsole(tp)) r = kbd_loadmap(m_ptr);
612 break;
613
614 case TIOCSFON:
615 /* Load a font into an EGA or VGA card (hs@hck.hr) */
616 if (isconsole(tp)) r = con_loadfont(m_ptr);
617 break;
618
619/* These Posix functions are allowed to fail if _POSIX_JOB_CONTROL is
620 * not defined.
621 */
622 case TIOCGPGRP:
623 case TIOCSPGRP:
624 default:
625 r = ENOTTY;
626 }
627
628 /* Send the reply. */
629 tty_reply(TASK_REPLY, m_ptr->m_source, m_ptr->PROC_NR, r);
630}
631
632/*===========================================================================*
633 * do_open *
634 *===========================================================================*/
635PRIVATE void do_open(tp, m_ptr)
636register tty_t *tp;
637message *m_ptr; /* pointer to message sent to task */
638{
639/* A tty line has been opened. Make it the callers controlling tty if
640 * O_NOCTTY is *not* set and it is not the log device. 1 is returned if
641 * the tty is made the controlling tty, otherwise OK or an error code.
642 */
643 int r = OK;
644
645 if (m_ptr->TTY_LINE == LOG_MINOR) {
646 /* The log device is a write-only diagnostics device. */
647 if (m_ptr->COUNT & R_BIT) r = EACCES;
648 } else {
649 if (!(m_ptr->COUNT & O_NOCTTY)) {
650 tp->tty_pgrp = m_ptr->PROC_NR;
651 r = 1;
652 }
653 tp->tty_openct++;
654 }
655 tty_reply(TASK_REPLY, m_ptr->m_source, m_ptr->PROC_NR, r);
656}
657
658/*===========================================================================*
659 * do_close *
660 *===========================================================================*/
661PRIVATE void do_close(tp, m_ptr)
662register tty_t *tp;
663message *m_ptr; /* pointer to message sent to task */
664{
665/* A tty line has been closed. Clean up the line if it is the last close. */
666
667 if (m_ptr->TTY_LINE != LOG_MINOR && --tp->tty_openct == 0) {
668 tp->tty_pgrp = 0;
669 tty_icancel(tp);
670 (*tp->tty_ocancel)(tp, 0);
671 (*tp->tty_close)(tp, 0);
672 tp->tty_termios = termios_defaults;
673 tp->tty_winsize = winsize_defaults;
674 setattr(tp);
675 }
676 tty_reply(TASK_REPLY, m_ptr->m_source, m_ptr->PROC_NR, OK);
677}
678
679/*===========================================================================*
680 * do_cancel *
681 *===========================================================================*/
682PRIVATE void do_cancel(tp, m_ptr)
683register tty_t *tp;
684message *m_ptr; /* pointer to message sent to task */
685{
686/* A signal has been sent to a process that is hanging trying to read or write.
687 * The pending read or write must be finished off immediately.
688 */
689
690 int proc_nr;
691 int mode;
692
693 /* Check the parameters carefully, to avoid cancelling twice. */
694 proc_nr = m_ptr->PROC_NR;
695 mode = m_ptr->COUNT;
696 if ((mode & R_BIT) && tp->tty_inleft != 0 && proc_nr == tp->tty_inproc) {
697 /* Process was reading when killed. Clean up input. */
698 tty_icancel(tp);
699 tp->tty_inleft = tp->tty_incum = 0;
700 }
701 if ((mode & W_BIT) && tp->tty_outleft != 0 && proc_nr == tp->tty_outproc) {
702 /* Process was writing when killed. Clean up output. */
703 (*tp->tty_ocancel)(tp, 0);
704 tp->tty_outleft = tp->tty_outcum = 0;
705 }
706 if (tp->tty_ioreq != 0 && proc_nr == tp->tty_ioproc) {
707 /* Process was waiting for output to drain. */
708 tp->tty_ioreq = 0;
709 }
710 tp->tty_events = 1;
711 tty_reply(TASK_REPLY, m_ptr->m_source, proc_nr, EINTR);
712}
713
714PUBLIC int select_try(struct tty *tp, int ops)
715{
716 int ready_ops = 0;
717
718 /* Special case. If line is hung up, no operations will block.
719 * (and it can be seen as an exceptional condition.)
720 */
721 if (tp->tty_termios.c_ospeed == B0) {
722 ready_ops |= ops;
723 }
724
725 if (ops & SEL_RD) {
726 /* will i/o not block on read? */
727 if (tp->tty_inleft > 0) {
728 ready_ops |= SEL_RD; /* EIO - no blocking */
729 } else if (tp->tty_incount > 0) {
730 /* Is a regular read possible? tty_incount
731 * says there is data. But a read will only succeed
732 * in canonical mode if a newline has been seen.
733 */
734 if (!(tp->tty_termios.c_lflag & ICANON) ||
735 tp->tty_eotct > 0) {
736 ready_ops |= SEL_RD;
737 }
738 }
739 }
740
741 if (ops & SEL_WR) {
742 if (tp->tty_outleft > 0) ready_ops |= SEL_WR;
743 else if ((*tp->tty_devwrite)(tp, 1)) ready_ops |= SEL_WR;
744 }
745
746 return ready_ops;
747}
748
749PUBLIC int select_retry(struct tty *tp)
750{
751 if (select_try(tp, tp->tty_select_ops))
752 notify(tp->tty_select_proc);
753 return OK;
754}
755
756/*===========================================================================*
757 * handle_events *
758 *===========================================================================*/
759PUBLIC void handle_events(tp)
760tty_t *tp; /* TTY to check for events. */
761{
762/* Handle any events pending on a TTY. These events are usually device
763 * interrupts.
764 *
765 * Two kinds of events are prominent:
766 * - a character has been received from the console or an RS232 line.
767 * - an RS232 line has completed a write request (on behalf of a user).
768 * The interrupt handler may delay the interrupt message at its discretion
769 * to avoid swamping the TTY task. Messages may be overwritten when the
770 * lines are fast or when there are races between different lines, input
771 * and output, because MINIX only provides single buffering for interrupt
772 * messages (in proc.c). This is handled by explicitly checking each line
773 * for fresh input and completed output on each interrupt.
774 */
775 char *buf;
776 unsigned count;
777 int status;
778
779 do {
780 tp->tty_events = 0;
781
782 /* Read input and perform input processing. */
783 (*tp->tty_devread)(tp, 0);
784
785 /* Perform output processing and write output. */
786 (*tp->tty_devwrite)(tp, 0);
787
788 /* Ioctl waiting for some event? */
789 if (tp->tty_ioreq != 0) dev_ioctl(tp);
790 } while (tp->tty_events);
791
792 /* Transfer characters from the input queue to a waiting process. */
793 in_transfer(tp);
794
795 /* Reply if enough bytes are available. */
796 if (tp->tty_incum >= tp->tty_min && tp->tty_inleft > 0) {
797 if (tp->tty_inrepcode == REVIVE) {
798 notify(tp->tty_incaller);
799 tp->tty_inrevived = 1;
800 } else {
801 tty_reply(tp->tty_inrepcode, tp->tty_incaller,
802 tp->tty_inproc, tp->tty_incum);
803 tp->tty_inleft = tp->tty_incum = 0;
804 }
805 }
806 if (tp->tty_select_ops)
807 select_retry(tp);
808#if NR_PTYS > 0
809 if (ispty(tp))
810 select_retry_pty(tp);
811#endif
812}
813
814/*===========================================================================*
815 * in_transfer *
816 *===========================================================================*/
817PRIVATE void in_transfer(tp)
818register tty_t *tp; /* pointer to terminal to read from */
819{
820/* Transfer bytes from the input queue to a process reading from a terminal. */
821
822 int ch;
823 int count;
824 char buf[64], *bp;
825
826 /* Force read to succeed if the line is hung up, looks like EOF to reader. */
827 if (tp->tty_termios.c_ospeed == B0) tp->tty_min = 0;
828
829 /* Anything to do? */
830 if (tp->tty_inleft == 0 || tp->tty_eotct < tp->tty_min) return;
831
832 bp = buf;
833 while (tp->tty_inleft > 0 && tp->tty_eotct > 0) {
834 ch = *tp->tty_intail;
835
836 if (!(ch & IN_EOF)) {
837 /* One character to be delivered to the user. */
838 *bp = ch & IN_CHAR;
839 tp->tty_inleft--;
840 if (++bp == bufend(buf)) {
841 /* Temp buffer full, copy to user space. */
842 sys_vircopy(SELF, D, (vir_bytes) buf,
843 tp->tty_inproc, D, tp->tty_in_vir,
844 (vir_bytes) buflen(buf));
845 tp->tty_in_vir += buflen(buf);
846 tp->tty_incum += buflen(buf);
847 bp = buf;
848 }
849 }
850
851 /* Remove the character from the input queue. */
852 if (++tp->tty_intail == bufend(tp->tty_inbuf))
853 tp->tty_intail = tp->tty_inbuf;
854 tp->tty_incount--;
855 if (ch & IN_EOT) {
856 tp->tty_eotct--;
857 /* Don't read past a line break in canonical mode. */
858 if (tp->tty_termios.c_lflag & ICANON) tp->tty_inleft = 0;
859 }
860 }
861
862 if (bp > buf) {
863 /* Leftover characters in the buffer. */
864 count = bp - buf;
865 sys_vircopy(SELF, D, (vir_bytes) buf,
866 tp->tty_inproc, D, tp->tty_in_vir, (vir_bytes) count);
867 tp->tty_in_vir += count;
868 tp->tty_incum += count;
869 }
870
871 /* Usually reply to the reader, possibly even if incum == 0 (EOF). */
872 if (tp->tty_inleft == 0) {
873 if (tp->tty_inrepcode == REVIVE) {
874 notify(tp->tty_incaller);
875 tp->tty_inrevived = 1;
876 } else {
877 tty_reply(tp->tty_inrepcode, tp->tty_incaller,
878 tp->tty_inproc, tp->tty_incum);
879 tp->tty_inleft = tp->tty_incum = 0;
880 }
881 }
882}
883
884/*===========================================================================*
885 * in_process *
886 *===========================================================================*/
887PUBLIC int in_process(tp, buf, count)
888register tty_t *tp; /* terminal on which character has arrived */
889char *buf; /* buffer with input characters */
890int count; /* number of input characters */
891{
892/* Characters have just been typed in. Process, save, and echo them. Return
893 * the number of characters processed.
894 */
895
896 int ch, sig, ct;
897 int timeset = FALSE;
898 static unsigned char csize_mask[] = { 0x1F, 0x3F, 0x7F, 0xFF };
899
900 for (ct = 0; ct < count; ct++) {
901 /* Take one character. */
902 ch = *buf++ & BYTE;
903
904 /* Strip to seven bits? */
905 if (tp->tty_termios.c_iflag & ISTRIP) ch &= 0x7F;
906
907 /* Input extensions? */
908 if (tp->tty_termios.c_lflag & IEXTEN) {
909
910 /* Previous character was a character escape? */
911 if (tp->tty_escaped) {
912 tp->tty_escaped = NOT_ESCAPED;
913 ch |= IN_ESC; /* protect character */
914 }
915
916 /* LNEXT (^V) to escape the next character? */
917 if (ch == tp->tty_termios.c_cc[VLNEXT]) {
918 tp->tty_escaped = ESCAPED;
919 rawecho(tp, '^');
920 rawecho(tp, '\b');
921 continue; /* do not store the escape */
922 }
923
924 /* REPRINT (^R) to reprint echoed characters? */
925 if (ch == tp->tty_termios.c_cc[VREPRINT]) {
926 reprint(tp);
927 continue;
928 }
929 }
930
931 /* _POSIX_VDISABLE is a normal character value, so better escape it. */
932 if (ch == _POSIX_VDISABLE) ch |= IN_ESC;
933
934 /* Map CR to LF, ignore CR, or map LF to CR. */
935 if (ch == '\r') {
936 if (tp->tty_termios.c_iflag & IGNCR) continue;
937 if (tp->tty_termios.c_iflag & ICRNL) ch = '\n';
938 } else
939 if (ch == '\n') {
940 if (tp->tty_termios.c_iflag & INLCR) ch = '\r';
941 }
942
943 /* Canonical mode? */
944 if (tp->tty_termios.c_lflag & ICANON) {
945
946 /* Erase processing (rub out of last character). */
947 if (ch == tp->tty_termios.c_cc[VERASE]) {
948 (void) back_over(tp);
949 if (!(tp->tty_termios.c_lflag & ECHOE)) {
950 (void) tty_echo(tp, ch);
951 }
952 continue;
953 }
954
955 /* Kill processing (remove current line). */
956 if (ch == tp->tty_termios.c_cc[VKILL]) {
957 while (back_over(tp)) {}
958 if (!(tp->tty_termios.c_lflag & ECHOE)) {
959 (void) tty_echo(tp, ch);
960 if (tp->tty_termios.c_lflag & ECHOK)
961 rawecho(tp, '\n');
962 }
963 continue;
964 }
965
966 /* EOF (^D) means end-of-file, an invisible "line break". */
967 if (ch == tp->tty_termios.c_cc[VEOF]) ch |= IN_EOT | IN_EOF;
968
969 /* The line may be returned to the user after an LF. */
970 if (ch == '\n') ch |= IN_EOT;
971
972 /* Same thing with EOL, whatever it may be. */
973 if (ch == tp->tty_termios.c_cc[VEOL]) ch |= IN_EOT;
974 }
975
976 /* Start/stop input control? */
977 if (tp->tty_termios.c_iflag & IXON) {
978
979 /* Output stops on STOP (^S). */
980 if (ch == tp->tty_termios.c_cc[VSTOP]) {
981 tp->tty_inhibited = STOPPED;
982 tp->tty_events = 1;
983 continue;
984 }
985
986 /* Output restarts on START (^Q) or any character if IXANY. */
987 if (tp->tty_inhibited) {
988 if (ch == tp->tty_termios.c_cc[VSTART]
989 || (tp->tty_termios.c_iflag & IXANY)) {
990 tp->tty_inhibited = RUNNING;
991 tp->tty_events = 1;
992 if (ch == tp->tty_termios.c_cc[VSTART])
993 continue;
994 }
995 }
996 }
997
998 if (tp->tty_termios.c_lflag & ISIG) {
999 /* Check for INTR (^?) and QUIT (^\) characters. */
1000 if (ch == tp->tty_termios.c_cc[VINTR]
1001 || ch == tp->tty_termios.c_cc[VQUIT]) {
1002 sig = SIGINT;
1003 if (ch == tp->tty_termios.c_cc[VQUIT]) sig = SIGQUIT;
1004 sigchar(tp, sig);
1005 (void) tty_echo(tp, ch);
1006 continue;
1007 }
1008 }
1009
1010 /* Is there space in the input buffer? */
1011 if (tp->tty_incount == buflen(tp->tty_inbuf)) {
1012 /* No space; discard in canonical mode, keep in raw mode. */
1013 if (tp->tty_termios.c_lflag & ICANON) continue;
1014 break;
1015 }
1016
1017 if (!(tp->tty_termios.c_lflag & ICANON)) {
1018 /* In raw mode all characters are "line breaks". */
1019 ch |= IN_EOT;
1020
1021 /* Start an inter-byte timer? */
1022 if (!timeset && tp->tty_termios.c_cc[VMIN] > 0
1023 && tp->tty_termios.c_cc[VTIME] > 0) {
1024 settimer(tp, TRUE);
1025 timeset = TRUE;
1026 }
1027 }
1028
1029 /* Perform the intricate function of echoing. */
1030 if (tp->tty_termios.c_lflag & (ECHO|ECHONL)) ch = tty_echo(tp, ch);
1031
1032 /* Save the character in the input queue. */
1033 *tp->tty_inhead++ = ch;
1034 if (tp->tty_inhead == bufend(tp->tty_inbuf))
1035 tp->tty_inhead = tp->tty_inbuf;
1036 tp->tty_incount++;
1037 if (ch & IN_EOT) tp->tty_eotct++;
1038
1039 /* Try to finish input if the queue threatens to overflow. */
1040 if (tp->tty_incount == buflen(tp->tty_inbuf)) in_transfer(tp);
1041 }
1042 return ct;
1043}
1044
1045/*===========================================================================*
1046 * echo *
1047 *===========================================================================*/
1048PRIVATE int tty_echo(tp, ch)
1049register tty_t *tp; /* terminal on which to echo */
1050register int ch; /* pointer to character to echo */
1051{
1052/* Echo the character if echoing is on. Some control characters are echoed
1053 * with their normal effect, other control characters are echoed as "^X",
1054 * normal characters are echoed normally. EOF (^D) is echoed, but immediately
1055 * backspaced over. Return the character with the echoed length added to its
1056 * attributes.
1057 */
1058 int len, rp;
1059
1060 ch &= ~IN_LEN;
1061 if (!(tp->tty_termios.c_lflag & ECHO)) {
1062 if (ch == ('\n' | IN_EOT) && (tp->tty_termios.c_lflag
1063 & (ICANON|ECHONL)) == (ICANON|ECHONL))
1064 (*tp->tty_echo)(tp, '\n');
1065 return(ch);
1066 }
1067
1068 /* "Reprint" tells if the echo output has been messed up by other output. */
1069 rp = tp->tty_incount == 0 ? FALSE : tp->tty_reprint;
1070
1071 if ((ch & IN_CHAR) < ' ') {
1072 switch (ch & (IN_ESC|IN_EOF|IN_EOT|IN_CHAR)) {
1073 case '\t':
1074 len = 0;
1075 do {
1076 (*tp->tty_echo)(tp, ' ');
1077 len++;
1078 } while (len < TAB_SIZE && (tp->tty_position & TAB_MASK) != 0);
1079 break;
1080 case '\r' | IN_EOT:
1081 case '\n' | IN_EOT:
1082 (*tp->tty_echo)(tp, ch & IN_CHAR);
1083 len = 0;
1084 break;
1085 default:
1086 (*tp->tty_echo)(tp, '^');
1087 (*tp->tty_echo)(tp, '@' + (ch & IN_CHAR));
1088 len = 2;
1089 }
1090 } else
1091 if ((ch & IN_CHAR) == '\177') {
1092 /* A DEL prints as "^?". */
1093 (*tp->tty_echo)(tp, '^');
1094 (*tp->tty_echo)(tp, '?');
1095 len = 2;
1096 } else {
1097 (*tp->tty_echo)(tp, ch & IN_CHAR);
1098 len = 1;
1099 }
1100 if (ch & IN_EOF) while (len > 0) { (*tp->tty_echo)(tp, '\b'); len--; }
1101
1102 tp->tty_reprint = rp;
1103 return(ch | (len << IN_LSHIFT));
1104}
1105
1106/*===========================================================================*
1107 * rawecho *
1108 *===========================================================================*/
1109PRIVATE void rawecho(tp, ch)
1110register tty_t *tp;
1111int ch;
1112{
1113/* Echo without interpretation if ECHO is set. */
1114 int rp = tp->tty_reprint;
1115 if (tp->tty_termios.c_lflag & ECHO) (*tp->tty_echo)(tp, ch);
1116 tp->tty_reprint = rp;
1117}
1118
1119/*===========================================================================*
1120 * back_over *
1121 *===========================================================================*/
1122PRIVATE int back_over(tp)
1123register tty_t *tp;
1124{
1125/* Backspace to previous character on screen and erase it. */
1126 u16_t *head;
1127 int len;
1128
1129 if (tp->tty_incount == 0) return(0); /* queue empty */
1130 head = tp->tty_inhead;
1131 if (head == tp->tty_inbuf) head = bufend(tp->tty_inbuf);
1132 if (*--head & IN_EOT) return(0); /* can't erase "line breaks" */
1133 if (tp->tty_reprint) reprint(tp); /* reprint if messed up */
1134 tp->tty_inhead = head;
1135 tp->tty_incount--;
1136 if (tp->tty_termios.c_lflag & ECHOE) {
1137 len = (*head & IN_LEN) >> IN_LSHIFT;
1138 while (len > 0) {
1139 rawecho(tp, '\b');
1140 rawecho(tp, ' ');
1141 rawecho(tp, '\b');
1142 len--;
1143 }
1144 }
1145 return(1); /* one character erased */
1146}
1147
1148/*===========================================================================*
1149 * reprint *
1150 *===========================================================================*/
1151PRIVATE void reprint(tp)
1152register tty_t *tp; /* pointer to tty struct */
1153{
1154/* Restore what has been echoed to screen before if the user input has been
1155 * messed up by output, or if REPRINT (^R) is typed.
1156 */
1157 int count;
1158 u16_t *head;
1159
1160 tp->tty_reprint = FALSE;
1161
1162 /* Find the last line break in the input. */
1163 head = tp->tty_inhead;
1164 count = tp->tty_incount;
1165 while (count > 0) {
1166 if (head == tp->tty_inbuf) head = bufend(tp->tty_inbuf);
1167 if (head[-1] & IN_EOT) break;
1168 head--;
1169 count--;
1170 }
1171 if (count == tp->tty_incount) return; /* no reason to reprint */
1172
1173 /* Show REPRINT (^R) and move to a new line. */
1174 (void) tty_echo(tp, tp->tty_termios.c_cc[VREPRINT] | IN_ESC);
1175 rawecho(tp, '\r');
1176 rawecho(tp, '\n');
1177
1178 /* Reprint from the last break onwards. */
1179 do {
1180 if (head == bufend(tp->tty_inbuf)) head = tp->tty_inbuf;
1181 *head = tty_echo(tp, *head);
1182 head++;
1183 count++;
1184 } while (count < tp->tty_incount);
1185}
1186
1187/*===========================================================================*
1188 * out_process *
1189 *===========================================================================*/
1190PUBLIC void out_process(tp, bstart, bpos, bend, icount, ocount)
1191tty_t *tp;
1192char *bstart, *bpos, *bend; /* start/pos/end of circular buffer */
1193int *icount; /* # input chars / input chars used */
1194int *ocount; /* max output chars / output chars used */
1195{
1196/* Perform output processing on a circular buffer. *icount is the number of
1197 * bytes to process, and the number of bytes actually processed on return.
1198 * *ocount is the space available on input and the space used on output.
1199 * (Naturally *icount < *ocount.) The column position is updated modulo
1200 * the TAB size, because we really only need it for tabs.
1201 */
1202
1203 int tablen;
1204 int ict = *icount;
1205 int oct = *ocount;
1206 int pos = tp->tty_position;
1207
1208 while (ict > 0) {
1209 switch (*bpos) {
1210 case '\7':
1211 break;
1212 case '\b':
1213 pos--;
1214 break;
1215 case '\r':
1216 pos = 0;
1217 break;
1218 case '\n':
1219 if ((tp->tty_termios.c_oflag & (OPOST|ONLCR))
1220 == (OPOST|ONLCR)) {
1221 /* Map LF to CR+LF if there is space. Note that the
1222 * next character in the buffer is overwritten, so
1223 * we stop at this point.
1224 */
1225 if (oct >= 2) {
1226 *bpos = '\r';
1227 if (++bpos == bend) bpos = bstart;
1228 *bpos = '\n';
1229 pos = 0;
1230 ict--;
1231 oct -= 2;
1232 }
1233 goto out_done; /* no space or buffer got changed */
1234 }
1235 break;
1236 case '\t':
1237 /* Best guess for the tab length. */
1238 tablen = TAB_SIZE - (pos & TAB_MASK);
1239
1240 if ((tp->tty_termios.c_oflag & (OPOST|XTABS))
1241 == (OPOST|XTABS)) {
1242 /* Tabs must be expanded. */
1243 if (oct >= tablen) {
1244 pos += tablen;
1245 ict--;
1246 oct -= tablen;
1247 do {
1248 *bpos = ' ';
1249 if (++bpos == bend) bpos = bstart;
1250 } while (--tablen != 0);
1251 }
1252 goto out_done;
1253 }
1254 /* Tabs are output directly. */
1255 pos += tablen;
1256 break;
1257 default:
1258 /* Assume any other character prints as one character. */
1259 pos++;
1260 }
1261 if (++bpos == bend) bpos = bstart;
1262 ict--;
1263 oct--;
1264 }
1265out_done:
1266 tp->tty_position = pos & TAB_MASK;
1267
1268 *icount -= ict; /* [io]ct are the number of chars not used */
1269 *ocount -= oct; /* *[io]count are the number of chars that are used */
1270}
1271
1272/*===========================================================================*
1273 * dev_ioctl *
1274 *===========================================================================*/
1275PRIVATE void dev_ioctl(tp)
1276tty_t *tp;
1277{
1278/* The ioctl's TCSETSW, TCSETSF and TCDRAIN wait for output to finish to make
1279 * sure that an attribute change doesn't affect the processing of current
1280 * output. Once output finishes the ioctl is executed as in do_ioctl().
1281 */
1282 int result;
1283
1284 if (tp->tty_outleft > 0) return; /* output not finished */
1285
1286 if (tp->tty_ioreq != TCDRAIN) {
1287 if (tp->tty_ioreq == TCSETSF) tty_icancel(tp);
1288 result = sys_vircopy(tp->tty_ioproc, D, tp->tty_iovir,
1289 SELF, D, (vir_bytes) &tp->tty_termios,
1290 (vir_bytes) sizeof(tp->tty_termios));
1291 setattr(tp);
1292 }
1293 tp->tty_ioreq = 0;
1294 tty_reply(REVIVE, tp->tty_iocaller, tp->tty_ioproc, result);
1295}
1296
1297/*===========================================================================*
1298 * setattr *
1299 *===========================================================================*/
1300PRIVATE void setattr(tp)
1301tty_t *tp;
1302{
1303/* Apply the new line attributes (raw/canonical, line speed, etc.) */
1304 u16_t *inp;
1305 int count;
1306
1307 if (!(tp->tty_termios.c_lflag & ICANON)) {
1308 /* Raw mode; put a "line break" on all characters in the input queue.
1309 * It is undefined what happens to the input queue when ICANON is
1310 * switched off, a process should use TCSAFLUSH to flush the queue.
1311 * Keeping the queue to preserve typeahead is the Right Thing, however
1312 * when a process does use TCSANOW to switch to raw mode.
1313 */
1314 count = tp->tty_eotct = tp->tty_incount;
1315 inp = tp->tty_intail;
1316 while (count > 0) {
1317 *inp |= IN_EOT;
1318 if (++inp == bufend(tp->tty_inbuf)) inp = tp->tty_inbuf;
1319 --count;
1320 }
1321 }
1322
1323 /* Inspect MIN and TIME. */
1324 settimer(tp, FALSE);
1325 if (tp->tty_termios.c_lflag & ICANON) {
1326 /* No MIN & TIME in canonical mode. */
1327 tp->tty_min = 1;
1328 } else {
1329 /* In raw mode MIN is the number of chars wanted, and TIME how long
1330 * to wait for them. With interesting exceptions if either is zero.
1331 */
1332 tp->tty_min = tp->tty_termios.c_cc[VMIN];
1333 if (tp->tty_min == 0 && tp->tty_termios.c_cc[VTIME] > 0)
1334 tp->tty_min = 1;
1335 }
1336
1337 if (!(tp->tty_termios.c_iflag & IXON)) {
1338 /* No start/stop output control, so don't leave output inhibited. */
1339 tp->tty_inhibited = RUNNING;
1340 tp->tty_events = 1;
1341 }
1342
1343 /* Setting the output speed to zero hangs up the phone. */
1344 if (tp->tty_termios.c_ospeed == B0) sigchar(tp, SIGHUP);
1345
1346 /* Set new line speed, character size, etc at the device level. */
1347 (*tp->tty_ioctl)(tp, 0);
1348}
1349
1350/*===========================================================================*
1351 * tty_reply *
1352 *===========================================================================*/
1353PUBLIC void tty_reply(code, replyee, proc_nr, status)
1354int code; /* TASK_REPLY or REVIVE */
1355int replyee; /* destination address for the reply */
1356int proc_nr; /* to whom should the reply go? */
1357int status; /* reply code */
1358{
1359/* Send a reply to a process that wanted to read or write data. */
1360 message tty_mess;
1361
1362 tty_mess.m_type = code;
1363 tty_mess.REP_PROC_NR = proc_nr;
1364 tty_mess.REP_STATUS = status;
1365
1366 if ((status = send(replyee, &tty_mess)) != OK) {
1367 panic("TTY","tty_reply failed, status\n", status);
1368 }
1369}
1370
1371/*===========================================================================*
1372 * sigchar *
1373 *===========================================================================*/
1374PUBLIC void sigchar(tp, sig)
1375register tty_t *tp;
1376int sig; /* SIGINT, SIGQUIT, SIGKILL or SIGHUP */
1377{
1378/* Process a SIGINT, SIGQUIT or SIGKILL char from the keyboard or SIGHUP from
1379 * a tty close, "stty 0", or a real RS-232 hangup. MM will send the signal to
1380 * the process group (INT, QUIT), all processes (KILL), or the session leader
1381 * (HUP).
1382 */
1383 int status;
1384
1385 if (tp->tty_pgrp != 0)
1386 if (OK != (status = sys_kill(tp->tty_pgrp, sig)))
1387 panic("TTY","Error, call to sys_kill failed", status);
1388
1389 if (!(tp->tty_termios.c_lflag & NOFLSH)) {
1390 tp->tty_incount = tp->tty_eotct = 0; /* kill earlier input */
1391 tp->tty_intail = tp->tty_inhead;
1392 (*tp->tty_ocancel)(tp, 0); /* kill all output */
1393 tp->tty_inhibited = RUNNING;
1394 tp->tty_events = 1;
1395 }
1396}
1397
1398/*===========================================================================*
1399 * tty_icancel *
1400 *===========================================================================*/
1401PRIVATE void tty_icancel(tp)
1402register tty_t *tp;
1403{
1404/* Discard all pending input, tty buffer or device. */
1405
1406 tp->tty_incount = tp->tty_eotct = 0;
1407 tp->tty_intail = tp->tty_inhead;
1408 (*tp->tty_icancel)(tp, 0);
1409}
1410
1411/*===========================================================================*
1412 * tty_init *
1413 *===========================================================================*/
1414PRIVATE void tty_init()
1415{
1416/* Initialize tty structure and call device initialization routines. */
1417
1418 register tty_t *tp;
1419 int s;
1420 struct sigaction sigact;
1421
1422 /* Initialize the terminal lines. */
1423 for (tp = FIRST_TTY,s=0; tp < END_TTY; tp++,s++) {
1424
1425 tp->tty_index = s;
1426
1427 tmr_inittimer(&tp->tty_tmr);
1428
1429 tp->tty_intail = tp->tty_inhead = tp->tty_inbuf;
1430 tp->tty_min = 1;
1431 tp->tty_termios = termios_defaults;
1432 tp->tty_icancel = tp->tty_ocancel = tp->tty_ioctl = tp->tty_close =
1433 tty_devnop;
1434 if (tp < tty_addr(NR_CONS)) {
1435 scr_init(tp);
1436 tp->tty_minor = CONS_MINOR + s;
1437 } else
1438 if (tp < tty_addr(NR_CONS+NR_RS_LINES)) {
1439 rs_init(tp);
1440 tp->tty_minor = RS232_MINOR + s-NR_CONS;
1441 } else {
1442 pty_init(tp);
1443 tp->tty_minor = s - (NR_CONS+NR_RS_LINES) + TTYPX_MINOR;
1444 }
1445 }
1446}
1447
1448/*===========================================================================*
1449 * tty_timed_out *
1450 *===========================================================================*/
1451PRIVATE void tty_timed_out(timer_t *tp)
1452{
1453/* This timer has expired. Set the events flag, to force processing. */
1454 tty_t *tty_ptr;
1455 tty_ptr = &tty_table[tmr_arg(tp)->ta_int];
1456 tty_ptr->tty_min = 0; /* force read to succeed */
1457 tty_ptr->tty_events = 1;
1458}
1459
1460/*===========================================================================*
1461 * expire_timers *
1462 *===========================================================================*/
1463PRIVATE void expire_timers(void)
1464{
1465/* A synchronous alarm message was received. Check if there are any expired
1466 * timers. Possibly set the event flag and reschedule another alarm.
1467 */
1468 clock_t now; /* current time */
1469 int s;
1470
1471 /* Get the current time to compare the timers against. */
1472 if ((s=getuptime(&now)) != OK)
1473 panic("TTY","Couldn't get uptime from clock.", s);
1474
1475 /* Scan the queue of timers for expired timers. This dispatch the watchdog
1476 * functions of expired timers. Possibly a new alarm call must be scheduled.
1477 */
1478 tmrs_exptimers(&tty_timers, now, NULL);
1479 if (tty_timers == NULL) tty_next_timeout = TMR_NEVER;
1480 else { /* set new sync alarm */
1481 tty_next_timeout = tty_timers->tmr_exp_time;
1482 if ((s=sys_setalarm(tty_next_timeout, 1)) != OK)
1483 panic("TTY","Couldn't set synchronous alarm.", s);
1484 }
1485}
1486
1487/*===========================================================================*
1488 * settimer *
1489 *===========================================================================*/
1490PRIVATE void settimer(tty_ptr, enable)
1491tty_t *tty_ptr; /* line to set or unset a timer on */
1492int enable; /* set timer if true, otherwise unset */
1493{
1494 clock_t now; /* current time */
1495 clock_t exp_time;
1496 int s;
1497
1498 /* Get the current time to calculate the timeout time. */
1499 if ((s=getuptime(&now)) != OK)
1500 panic("TTY","Couldn't get uptime from clock.", s);
1501 if (enable) {
1502 exp_time = now + tty_ptr->tty_termios.c_cc[VTIME] * (HZ/10);
1503 /* Set a new timer for enabling the TTY events flags. */
1504 tmrs_settimer(&tty_timers, &tty_ptr->tty_tmr,
1505 exp_time, tty_timed_out, NULL);
1506 } else {
1507 /* Remove the timer from the active and expired lists. */
1508 tmrs_clrtimer(&tty_timers, &tty_ptr->tty_tmr, NULL);
1509 }
1510
1511 /* Now check if a new alarm must be scheduled. This happens when the front
1512 * of the timers queue was disabled or reinserted at another position, or
1513 * when a new timer was added to the front.
1514 */
1515 if (tty_timers == NULL) tty_next_timeout = TMR_NEVER;
1516 else if (tty_timers->tmr_exp_time != tty_next_timeout) {
1517 tty_next_timeout = tty_timers->tmr_exp_time;
1518 if ((s=sys_setalarm(tty_next_timeout, 1)) != OK)
1519 panic("TTY","Couldn't set synchronous alarm.", s);
1520 }
1521}
1522
1523/*===========================================================================*
1524 * tty_devnop *
1525 *===========================================================================*/
1526PUBLIC int tty_devnop(tp, try)
1527tty_t *tp;
1528int try;
1529{
1530 /* Some functions need not be implemented at the device level. */
1531}
1532
1533/*===========================================================================*
1534 * do_select *
1535 *===========================================================================*/
1536PRIVATE void do_select(tp, m_ptr)
1537register tty_t *tp; /* pointer to tty struct */
1538register message *m_ptr; /* pointer to message sent to the task */
1539{
1540 int ops, ready_ops = 0, watch;
1541
1542 ops = m_ptr->PROC_NR & (SEL_RD|SEL_WR|SEL_ERR);
1543 watch = (m_ptr->PROC_NR & SEL_NOTIFY) ? 1 : 0;
1544
1545 ready_ops = select_try(tp, ops);
1546
1547 if (!ready_ops && ops && watch) {
1548 tp->tty_select_ops |= ops;
1549 tp->tty_select_proc = m_ptr->m_source;
1550 }
1551
1552 tty_reply(TASK_REPLY, m_ptr->m_source, m_ptr->PROC_NR, ready_ops);
1553
1554 return;
1555}
Note: See TracBrowser for help on using the repository browser.