Blame view
drivers/tty/n_tty.c
51.9 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 |
/* * n_tty.c --- implements the N_TTY line discipline. |
4edf1827e n_tty: clean up o... |
3 |
* |
1da177e4c Linux-2.6.12-rc2 |
4 5 6 7 8 9 10 |
* This code used to be in tty_io.c, but things are getting hairy * enough that it made sense to split things off. (The N_TTY * processing has changed so much that it's hardly recognizable, * anyway...) * * Note that the open routine for N_TTY is guaranteed never to return * an error. This is because Linux will fall back to setting a line |
4edf1827e n_tty: clean up o... |
11 |
* to N_TTY if it can not switch to any other line discipline. |
1da177e4c Linux-2.6.12-rc2 |
12 13 |
* * Written by Theodore Ts'o, Copyright 1994. |
4edf1827e n_tty: clean up o... |
14 |
* |
1da177e4c Linux-2.6.12-rc2 |
15 16 |
* This file also contains code originally written by Linus Torvalds, * Copyright 1991, 1992, 1993, and by Julian Cowley, Copyright 1994. |
4edf1827e n_tty: clean up o... |
17 |
* |
1da177e4c Linux-2.6.12-rc2 |
18 19 20 21 22 |
* This file may be redistributed under the terms of the GNU General Public * License. * * Reduced memory usage for older ARM systems - Russell King. * |
4edf1827e n_tty: clean up o... |
23 |
* 2000/01/20 Fixed SMP locking on put_tty_queue using bits of |
1da177e4c Linux-2.6.12-rc2 |
24 25 26 27 28 |
* the patch by Andrew J. Kroll <ag784@freenet.buffalo.edu> * who actually finally proved there really was a race. * * 2002/03/18 Implemented n_tty_wakeup to send SIGIO POLL_OUTs to * waiting writing processes-Sapan Bhatia <sapan@corewars.org>. |
11a96d182 tty: rename the r... |
29 |
* Also fixed a bug in BLOCKING mode where n_tty_write returns |
1da177e4c Linux-2.6.12-rc2 |
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 |
* EAGAIN */ #include <linux/types.h> #include <linux/major.h> #include <linux/errno.h> #include <linux/signal.h> #include <linux/fcntl.h> #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/tty.h> #include <linux/timer.h> #include <linux/ctype.h> #include <linux/mm.h> #include <linux/string.h> #include <linux/slab.h> #include <linux/poll.h> #include <linux/bitops.h> |
522ed7767 Audit: add TTY in... |
48 49 |
#include <linux/audit.h> #include <linux/file.h> |
300a6204b n_tty: clean up c... |
50 |
#include <linux/uaccess.h> |
572b9adbd ldisc n_tty: add ... |
51 |
#include <linux/module.h> |
1da177e4c Linux-2.6.12-rc2 |
52 |
|
1da177e4c Linux-2.6.12-rc2 |
53 54 55 56 57 58 59 60 61 62 63 |
#include <asm/system.h> /* number of characters left in xmit buffer before select has we have room */ #define WAKEUP_CHARS 256 /* * This defines the low- and high-watermarks for throttling and * unthrottling the TTY driver. These watermarks are used for * controlling the space in the read buffer. */ #define TTY_THRESHOLD_THROTTLE 128 /* now based on remaining room */ |
bbd20759d drivers/tty: Remo... |
64 |
#define TTY_THRESHOLD_UNTHROTTLE 128 |
1da177e4c Linux-2.6.12-rc2 |
65 |
|
a88a69c91 n_tty: Fix loss o... |
66 67 68 69 70 71 72 73 74 75 |
/* * Special byte codes used in the echo buffer to represent operations * or special handling of characters. Bytes in the echo buffer that * are not part of such special blocks are treated as normal character * codes. */ #define ECHO_OP_START 0xff #define ECHO_OP_MOVE_BACK_COL 0x80 #define ECHO_OP_SET_CANON_COL 0x81 #define ECHO_OP_ERASE_TAB 0x82 |
522ed7767 Audit: add TTY in... |
76 77 78 79 80 81 |
static inline int tty_put_user(struct tty_struct *tty, unsigned char x, unsigned char __user *ptr) { tty_audit_add_data(tty, &x, 1); return put_user(x, ptr); } |
55db4c64e Revert "tty: make... |
82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 |
/** * n_tty_set__room - receive space * @tty: terminal * * Called by the driver to find out how much data it is * permitted to feed to the line discipline without any being lost * and thus to manage flow control. Not serialized. Answers for the * "instant". */ static void n_tty_set_room(struct tty_struct *tty) { /* tty->read_cnt is not read locked ? */ int left = N_TTY_BUF_SIZE - tty->read_cnt - 1; int old_left; /* * If we are doing input canonicalization, and there are no * pending newlines, let characters through without limit, so * that erase characters will be handled. Other excess * characters will be beeped. */ if (left <= 0) left = tty->icanon && !tty->canon_data; old_left = tty->receive_room; tty->receive_room = left; /* Did this open up the receive buffer? We may need to flip */ if (left && !old_left) schedule_work(&tty->buf.work); } |
33f0f88f1 [PATCH] TTY layer... |
113 |
static void put_tty_queue_nolock(unsigned char c, struct tty_struct *tty) |
1da177e4c Linux-2.6.12-rc2 |
114 115 116 117 118 119 120 |
{ if (tty->read_cnt < N_TTY_BUF_SIZE) { tty->read_buf[tty->read_head] = c; tty->read_head = (tty->read_head + 1) & (N_TTY_BUF_SIZE-1); tty->read_cnt++; } } |
17b820606 tty: Minor tidyup... |
121 122 123 124 125 126 127 128 129 |
/** * put_tty_queue - add character to tty * @c: character * @tty: tty device * * Add a character to the tty read_buf queue. This is done under the * read_lock to serialize character addition and also to protect us * against parallel reads or flushes */ |
33f0f88f1 [PATCH] TTY layer... |
130 |
static void put_tty_queue(unsigned char c, struct tty_struct *tty) |
1da177e4c Linux-2.6.12-rc2 |
131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 |
{ unsigned long flags; /* * The problem of stomping on the buffers ends here. * Why didn't anyone see this one coming? --AJK */ spin_lock_irqsave(&tty->read_lock, flags); put_tty_queue_nolock(c, tty); spin_unlock_irqrestore(&tty->read_lock, flags); } /** * check_unthrottle - allow new receive data * @tty; tty device * |
17b820606 tty: Minor tidyup... |
146 147 |
* Check whether to call the driver unthrottle functions * |
70522e121 [PATCH] sem2mutex... |
148 |
* Can sleep, may be called under the atomic_read_lock mutex but |
1da177e4c Linux-2.6.12-rc2 |
149 150 |
* this is not guaranteed. */ |
4edf1827e n_tty: clean up o... |
151 |
static void check_unthrottle(struct tty_struct *tty) |
1da177e4c Linux-2.6.12-rc2 |
152 |
{ |
39c2e60f8 tty: add throttle... |
153 154 |
if (tty->count) tty_unthrottle(tty); |
1da177e4c Linux-2.6.12-rc2 |
155 156 157 158 159 160 |
} /** * reset_buffer_flags - reset buffer state * @tty: terminal to reset * |
4edf1827e n_tty: clean up o... |
161 |
* Reset the read buffer counters, clear the flags, |
1da177e4c Linux-2.6.12-rc2 |
162 163 |
* and make sure the driver is unthrottled. Called * from n_tty_open() and n_tty_flush_buffer(). |
17b820606 tty: Minor tidyup... |
164 165 |
* * Locking: tty_read_lock for read fields. |
1da177e4c Linux-2.6.12-rc2 |
166 |
*/ |
a88a69c91 n_tty: Fix loss o... |
167 |
|
1da177e4c Linux-2.6.12-rc2 |
168 169 170 171 172 173 174 |
static void reset_buffer_flags(struct tty_struct *tty) { unsigned long flags; spin_lock_irqsave(&tty->read_lock, flags); tty->read_head = tty->read_tail = tty->read_cnt = 0; spin_unlock_irqrestore(&tty->read_lock, flags); |
a88a69c91 n_tty: Fix loss o... |
175 176 177 178 |
mutex_lock(&tty->echo_lock); tty->echo_pos = tty->echo_cnt = tty->echo_overrun = 0; mutex_unlock(&tty->echo_lock); |
1da177e4c Linux-2.6.12-rc2 |
179 180 |
tty->canon_head = tty->canon_data = tty->erasing = 0; memset(&tty->read_flags, 0, sizeof tty->read_flags); |
55db4c64e Revert "tty: make... |
181 |
n_tty_set_room(tty); |
1da177e4c Linux-2.6.12-rc2 |
182 183 184 185 186 187 188 189 190 191 192 |
} /** * n_tty_flush_buffer - clean input queue * @tty: terminal device * * Flush the input buffer. Called when the line discipline is * being closed, when the tty layer wants the buffer flushed (eg * at hangup) or when the N_TTY line discipline internally has to * clean the pending queue (for example some signals). * |
17b820606 tty: Minor tidyup... |
193 |
* Locking: ctrl_lock, read_lock. |
1da177e4c Linux-2.6.12-rc2 |
194 |
*/ |
4edf1827e n_tty: clean up o... |
195 196 |
static void n_tty_flush_buffer(struct tty_struct *tty) |
1da177e4c Linux-2.6.12-rc2 |
197 |
{ |
04f378b19 tty: BKL pushdown |
198 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
199 200 |
/* clear everything and unthrottle the driver */ reset_buffer_flags(tty); |
4edf1827e n_tty: clean up o... |
201 |
|
1da177e4c Linux-2.6.12-rc2 |
202 203 |
if (!tty->link) return; |
04f378b19 tty: BKL pushdown |
204 |
spin_lock_irqsave(&tty->ctrl_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
205 206 207 208 |
if (tty->link->packet) { tty->ctrl_status |= TIOCPKT_FLUSHREAD; wake_up_interruptible(&tty->link->read_wait); } |
04f378b19 tty: BKL pushdown |
209 |
spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
210 211 212 213 214 215 216 |
} /** * n_tty_chars_in_buffer - report available bytes * @tty: tty device * * Report the number of characters buffered to be delivered to user |
4edf1827e n_tty: clean up o... |
217 |
* at this instant in time. |
17b820606 tty: Minor tidyup... |
218 219 |
* * Locking: read_lock |
1da177e4c Linux-2.6.12-rc2 |
220 |
*/ |
4edf1827e n_tty: clean up o... |
221 |
|
1da177e4c Linux-2.6.12-rc2 |
222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 |
static ssize_t n_tty_chars_in_buffer(struct tty_struct *tty) { unsigned long flags; ssize_t n = 0; spin_lock_irqsave(&tty->read_lock, flags); if (!tty->icanon) { n = tty->read_cnt; } else if (tty->canon_data) { n = (tty->canon_head > tty->read_tail) ? tty->canon_head - tty->read_tail : tty->canon_head + (N_TTY_BUF_SIZE - tty->read_tail); } spin_unlock_irqrestore(&tty->read_lock, flags); return n; } /** * is_utf8_continuation - utf8 multibyte check * @c: byte to check * * Returns true if the utf8 character 'c' is a multibyte continuation * character. We use this to correctly compute the on screen size * of the character when printing */ |
4edf1827e n_tty: clean up o... |
247 |
|
1da177e4c Linux-2.6.12-rc2 |
248 249 250 251 252 253 254 255 256 257 258 259 |
static inline int is_utf8_continuation(unsigned char c) { return (c & 0xc0) == 0x80; } /** * is_continuation - multibyte check * @c: byte to check * * Returns true if the utf8 character 'c' is a multibyte continuation * character and the terminal is in unicode mode. */ |
4edf1827e n_tty: clean up o... |
260 |
|
1da177e4c Linux-2.6.12-rc2 |
261 262 263 264 265 266 |
static inline int is_continuation(unsigned char c, struct tty_struct *tty) { return I_IUTF8(tty) && is_utf8_continuation(c); } /** |
a88a69c91 n_tty: Fix loss o... |
267 |
* do_output_char - output one character |
1da177e4c Linux-2.6.12-rc2 |
268 269 |
* @c: character (or partial unicode symbol) * @tty: terminal device |
a88a69c91 n_tty: Fix loss o... |
270 |
* @space: space available in tty driver write buffer |
1da177e4c Linux-2.6.12-rc2 |
271 |
* |
a88a69c91 n_tty: Fix loss o... |
272 273 |
* This is a helper function that handles one output character * (including special characters like TAB, CR, LF, etc.), |
ee5aa7b8b n_tty: honor opos... |
274 275 |
* doing OPOST processing and putting the results in the * tty driver's write buffer. |
a88a69c91 n_tty: Fix loss o... |
276 277 278 279 |
* * Note that Linux currently ignores TABDLY, CRDLY, VTDLY, FFDLY * and NLDLY. They simply aren't relevant in the world today. * If you ever need them, add them here. |
1da177e4c Linux-2.6.12-rc2 |
280 |
* |
a88a69c91 n_tty: Fix loss o... |
281 282 283 284 285 |
* Returns the number of bytes of buffer space used or -1 if * no space left. * * Locking: should be called under the output_lock to protect * the column state and space left in the buffer |
1da177e4c Linux-2.6.12-rc2 |
286 |
*/ |
4edf1827e n_tty: clean up o... |
287 |
|
a88a69c91 n_tty: Fix loss o... |
288 |
static int do_output_char(unsigned char c, struct tty_struct *tty, int space) |
1da177e4c Linux-2.6.12-rc2 |
289 |
{ |
a88a69c91 n_tty: Fix loss o... |
290 |
int spaces; |
1da177e4c Linux-2.6.12-rc2 |
291 |
|
1da177e4c Linux-2.6.12-rc2 |
292 293 |
if (!space) return -1; |
300a6204b n_tty: clean up c... |
294 |
|
a88a69c91 n_tty: Fix loss o... |
295 296 297 298 299 300 301 302 |
switch (c) { case ' ': if (O_ONLRET(tty)) tty->column = 0; if (O_ONLCR(tty)) { if (space < 2) return -1; |
1da177e4c Linux-2.6.12-rc2 |
303 |
tty->canon_column = tty->column = 0; |
37f81fa1f n_tty: do O_ONLCR... |
304 305 |
tty->ops->write(tty, "\r ", 2); |
a88a69c91 n_tty: Fix loss o... |
306 307 308 309 310 311 312 313 314 315 316 317 |
return 2; } tty->canon_column = tty->column; break; case '\r': if (O_ONOCR(tty) && tty->column == 0) return 0; if (O_OCRNL(tty)) { c = ' '; if (O_ONLRET(tty)) tty->canon_column = tty->column = 0; |
1da177e4c Linux-2.6.12-rc2 |
318 |
break; |
a88a69c91 n_tty: Fix loss o... |
319 320 321 322 323 324 325 326 |
} tty->canon_column = tty->column = 0; break; case '\t': spaces = 8 - (tty->column & 7); if (O_TABDLY(tty) == XTABS) { if (space < spaces) return -1; |
1da177e4c Linux-2.6.12-rc2 |
327 |
tty->column += spaces; |
a88a69c91 n_tty: Fix loss o... |
328 329 |
tty->ops->write(tty, " ", spaces); return spaces; |
1da177e4c Linux-2.6.12-rc2 |
330 |
} |
a88a69c91 n_tty: Fix loss o... |
331 332 333 334 335 336 337 |
tty->column += spaces; break; case '\b': if (tty->column > 0) tty->column--; break; default: |
a59c0d6f1 n_tty: Fix handli... |
338 339 340 341 342 343 |
if (!iscntrl(c)) { if (O_OLCUC(tty)) c = toupper(c); if (!is_continuation(c, tty)) tty->column++; } |
a88a69c91 n_tty: Fix loss o... |
344 |
break; |
1da177e4c Linux-2.6.12-rc2 |
345 |
} |
a88a69c91 n_tty: Fix loss o... |
346 |
|
f34d7a5b7 tty: The big oper... |
347 |
tty_put_char(tty, c); |
a88a69c91 n_tty: Fix loss o... |
348 349 350 351 352 353 354 355 |
return 1; } /** * process_output - output post processor * @c: character (or partial unicode symbol) * @tty: terminal device * |
ee5aa7b8b n_tty: honor opos... |
356 357 358 |
* Output one character with OPOST processing. * Returns -1 when the output device is full and the character * must be retried. |
a88a69c91 n_tty: Fix loss o... |
359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 |
* * Locking: output_lock to protect column state and space left * (also, this is called from n_tty_write under the * tty layer write lock) */ static int process_output(unsigned char c, struct tty_struct *tty) { int space, retval; mutex_lock(&tty->output_lock); space = tty_write_room(tty); retval = do_output_char(c, tty, space); mutex_unlock(&tty->output_lock); if (retval < 0) return -1; else return 0; |
1da177e4c Linux-2.6.12-rc2 |
379 380 381 |
} /** |
a88a69c91 n_tty: Fix loss o... |
382 |
* process_output_block - block post processor |
1da177e4c Linux-2.6.12-rc2 |
383 |
* @tty: terminal device |
ee5aa7b8b n_tty: honor opos... |
384 385 386 387 388 |
* @buf: character buffer * @nr: number of bytes to output * * Output a block of characters with OPOST processing. * Returns the number of characters output. |
1da177e4c Linux-2.6.12-rc2 |
389 390 391 392 393 394 |
* * This path is used to speed up block console writes, among other * things when processing blocks of output data. It handles only * the simple cases normally found and helps to generate blocks of * symbols for the console driver and thus improve performance. * |
a88a69c91 n_tty: Fix loss o... |
395 396 397 |
* Locking: output_lock to protect column state and space left * (also, this is called from n_tty_write under the * tty layer write lock) |
1da177e4c Linux-2.6.12-rc2 |
398 |
*/ |
4edf1827e n_tty: clean up o... |
399 |
|
a88a69c91 n_tty: Fix loss o... |
400 401 |
static ssize_t process_output_block(struct tty_struct *tty, const unsigned char *buf, unsigned int nr) |
1da177e4c Linux-2.6.12-rc2 |
402 403 |
{ int space; |
bbd20759d drivers/tty: Remo... |
404 |
int i; |
1da177e4c Linux-2.6.12-rc2 |
405 |
const unsigned char *cp; |
a88a69c91 n_tty: Fix loss o... |
406 |
mutex_lock(&tty->output_lock); |
f34d7a5b7 tty: The big oper... |
407 |
space = tty_write_room(tty); |
300a6204b n_tty: clean up c... |
408 |
if (!space) { |
a88a69c91 n_tty: Fix loss o... |
409 |
mutex_unlock(&tty->output_lock); |
1da177e4c Linux-2.6.12-rc2 |
410 |
return 0; |
a88a69c91 n_tty: Fix loss o... |
411 |
} |
1da177e4c Linux-2.6.12-rc2 |
412 413 414 415 |
if (nr > space) nr = space; for (i = 0, cp = buf; i < nr; i++, cp++) { |
a59c0d6f1 n_tty: Fix handli... |
416 417 418 |
unsigned char c = *cp; switch (c) { |
1da177e4c Linux-2.6.12-rc2 |
419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 |
case ' ': if (O_ONLRET(tty)) tty->column = 0; if (O_ONLCR(tty)) goto break_out; tty->canon_column = tty->column; break; case '\r': if (O_ONOCR(tty) && tty->column == 0) goto break_out; if (O_OCRNL(tty)) goto break_out; tty->canon_column = tty->column = 0; break; case '\t': goto break_out; case '\b': if (tty->column > 0) tty->column--; break; default: |
a59c0d6f1 n_tty: Fix handli... |
441 442 443 444 445 446 |
if (!iscntrl(c)) { if (O_OLCUC(tty)) goto break_out; if (!is_continuation(c, tty)) tty->column++; } |
1da177e4c Linux-2.6.12-rc2 |
447 448 449 450 |
break; } } break_out: |
f34d7a5b7 tty: The big oper... |
451 |
i = tty->ops->write(tty, buf, i); |
a88a69c91 n_tty: Fix loss o... |
452 453 |
mutex_unlock(&tty->output_lock); |
1da177e4c Linux-2.6.12-rc2 |
454 455 |
return i; } |
a88a69c91 n_tty: Fix loss o... |
456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 |
/** * process_echoes - write pending echo characters * @tty: terminal device * * Write previously buffered echo (and other ldisc-generated) * characters to the tty. * * Characters generated by the ldisc (including echoes) need to * be buffered because the driver's write buffer can fill during * heavy program output. Echoing straight to the driver will * often fail under these conditions, causing lost characters and * resulting mismatches of ldisc state information. * * Since the ldisc state must represent the characters actually sent * to the driver at the time of the write, operations like certain * changes in column state are also saved in the buffer and executed * here. * * A circular fifo buffer is used so that the most recent characters * are prioritized. Also, when control characters are echoed with a * prefixed "^", the pair is treated atomically and thus not separated. * * Locking: output_lock to protect column state and space left, * echo_lock to protect the echo buffer */ static void process_echoes(struct tty_struct *tty) { int space, nr; unsigned char c; unsigned char *cp, *buf_end; if (!tty->echo_cnt) return; mutex_lock(&tty->output_lock); mutex_lock(&tty->echo_lock); space = tty_write_room(tty); buf_end = tty->echo_buf + N_TTY_BUF_SIZE; cp = tty->echo_buf + tty->echo_pos; nr = tty->echo_cnt; while (nr > 0) { c = *cp; if (c == ECHO_OP_START) { unsigned char op; unsigned char *opp; int no_space_left = 0; /* * If the buffer byte is the start of a multi-byte * operation, get the next byte, which is either the * op code or a control character value. */ opp = cp + 1; if (opp == buf_end) opp -= N_TTY_BUF_SIZE; op = *opp; |
300a6204b n_tty: clean up c... |
515 |
|
a88a69c91 n_tty: Fix loss o... |
516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 |
switch (op) { unsigned int num_chars, num_bs; case ECHO_OP_ERASE_TAB: if (++opp == buf_end) opp -= N_TTY_BUF_SIZE; num_chars = *opp; /* * Determine how many columns to go back * in order to erase the tab. * This depends on the number of columns * used by other characters within the tab * area. If this (modulo 8) count is from * the start of input rather than from a * previous tab, we offset by canon column. * Otherwise, tab spacing is normal. */ if (!(num_chars & 0x80)) num_chars += tty->canon_column; num_bs = 8 - (num_chars & 7); if (num_bs > space) { no_space_left = 1; break; } space -= num_bs; while (num_bs--) { tty_put_char(tty, '\b'); if (tty->column > 0) tty->column--; } cp += 3; nr -= 3; break; case ECHO_OP_SET_CANON_COL: tty->canon_column = tty->column; cp += 2; nr -= 2; break; case ECHO_OP_MOVE_BACK_COL: if (tty->column > 0) tty->column--; cp += 2; nr -= 2; break; case ECHO_OP_START: /* This is an escaped echo op start code */ if (!space) { no_space_left = 1; break; } tty_put_char(tty, ECHO_OP_START); tty->column++; space--; cp += 2; nr -= 2; break; default: |
a88a69c91 n_tty: Fix loss o... |
579 |
/* |
62b263585 n_tty: move echoc... |
580 581 582 583 584 585 586 |
* If the op is not a special byte code, * it is a ctrl char tagged to be echoed * as "^X" (where X is the letter * representing the control char). * Note that we must ensure there is * enough space for the whole ctrl pair. * |
a88a69c91 n_tty: Fix loss o... |
587 |
*/ |
62b263585 n_tty: move echoc... |
588 589 590 591 592 593 594 595 |
if (space < 2) { no_space_left = 1; break; } tty_put_char(tty, '^'); tty_put_char(tty, op ^ 0100); tty->column += 2; space -= 2; |
a88a69c91 n_tty: Fix loss o... |
596 597 598 599 600 601 602 |
cp += 2; nr -= 2; } if (no_space_left) break; } else { |
ee5aa7b8b n_tty: honor opos... |
603 604 605 606 607 608 609 610 611 612 613 614 |
if (O_OPOST(tty) && !(test_bit(TTY_HW_COOK_OUT, &tty->flags))) { int retval = do_output_char(c, tty, space); if (retval < 0) break; space -= retval; } else { if (!space) break; tty_put_char(tty, c); space -= 1; } |
a88a69c91 n_tty: Fix loss o... |
615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 |
cp += 1; nr -= 1; } /* When end of circular buffer reached, wrap around */ if (cp >= buf_end) cp -= N_TTY_BUF_SIZE; } if (nr == 0) { tty->echo_pos = 0; tty->echo_cnt = 0; tty->echo_overrun = 0; } else { int num_processed = tty->echo_cnt - nr; tty->echo_pos += num_processed; tty->echo_pos &= N_TTY_BUF_SIZE - 1; tty->echo_cnt = nr; if (num_processed > 0) tty->echo_overrun = 0; } mutex_unlock(&tty->echo_lock); mutex_unlock(&tty->output_lock); if (tty->ops->flush_chars) tty->ops->flush_chars(tty); } /** * add_echo_byte - add a byte to the echo buffer * @c: unicode byte to echo * @tty: terminal device * * Add a character or operation byte to the echo buffer. * * Should be called under the echo lock to protect the echo buffer. */ static void add_echo_byte(unsigned char c, struct tty_struct *tty) { int new_byte_pos; if (tty->echo_cnt == N_TTY_BUF_SIZE) { /* Circular buffer is already at capacity */ new_byte_pos = tty->echo_pos; /* * Since the buffer start position needs to be advanced, * be sure to step by a whole operation byte group. */ |
300a6204b n_tty: clean up c... |
666 |
if (tty->echo_buf[tty->echo_pos] == ECHO_OP_START) { |
a88a69c91 n_tty: Fix loss o... |
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 |
if (tty->echo_buf[(tty->echo_pos + 1) & (N_TTY_BUF_SIZE - 1)] == ECHO_OP_ERASE_TAB) { tty->echo_pos += 3; tty->echo_cnt -= 2; } else { tty->echo_pos += 2; tty->echo_cnt -= 1; } } else { tty->echo_pos++; } tty->echo_pos &= N_TTY_BUF_SIZE - 1; tty->echo_overrun = 1; } else { new_byte_pos = tty->echo_pos + tty->echo_cnt; new_byte_pos &= N_TTY_BUF_SIZE - 1; tty->echo_cnt++; } tty->echo_buf[new_byte_pos] = c; } /** * echo_move_back_col - add operation to move back a column * @tty: terminal device * * Add an operation to the echo buffer to move back one column. * * Locking: echo_lock to protect the echo buffer */ static void echo_move_back_col(struct tty_struct *tty) { mutex_lock(&tty->echo_lock); add_echo_byte(ECHO_OP_START, tty); add_echo_byte(ECHO_OP_MOVE_BACK_COL, tty); mutex_unlock(&tty->echo_lock); } /** * echo_set_canon_col - add operation to set the canon column * @tty: terminal device * * Add an operation to the echo buffer to set the canon column * to the current column. * * Locking: echo_lock to protect the echo buffer */ static void echo_set_canon_col(struct tty_struct *tty) { mutex_lock(&tty->echo_lock); add_echo_byte(ECHO_OP_START, tty); add_echo_byte(ECHO_OP_SET_CANON_COL, tty); mutex_unlock(&tty->echo_lock); } /** * echo_erase_tab - add operation to erase a tab * @num_chars: number of character columns already used * @after_tab: true if num_chars starts after a previous tab * @tty: terminal device * * Add an operation to the echo buffer to erase a tab. * * Called by the eraser function, which knows how many character * columns have been used since either a previous tab or the start * of input. This information will be used later, along with * canon column (if applicable), to go back the correct number * of columns. * * Locking: echo_lock to protect the echo buffer */ static void echo_erase_tab(unsigned int num_chars, int after_tab, struct tty_struct *tty) { mutex_lock(&tty->echo_lock); add_echo_byte(ECHO_OP_START, tty); add_echo_byte(ECHO_OP_ERASE_TAB, tty); /* We only need to know this modulo 8 (tab spacing) */ num_chars &= 7; /* Set the high bit as a flag if num_chars is after a previous tab */ if (after_tab) num_chars |= 0x80; |
300a6204b n_tty: clean up c... |
761 |
|
a88a69c91 n_tty: Fix loss o... |
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 |
add_echo_byte(num_chars, tty); mutex_unlock(&tty->echo_lock); } /** * echo_char_raw - echo a character raw * @c: unicode byte to echo * @tty: terminal device * * Echo user input back onto the screen. This must be called only when * L_ECHO(tty) is true. Called from the driver receive_buf path. * * This variant does not treat control characters specially. * * Locking: echo_lock to protect the echo buffer */ static void echo_char_raw(unsigned char c, struct tty_struct *tty) { mutex_lock(&tty->echo_lock); if (c == ECHO_OP_START) { add_echo_byte(ECHO_OP_START, tty); add_echo_byte(ECHO_OP_START, tty); } else { add_echo_byte(c, tty); } mutex_unlock(&tty->echo_lock); } |
1da177e4c Linux-2.6.12-rc2 |
793 794 |
/** |
a88a69c91 n_tty: Fix loss o... |
795 |
* echo_char - echo a character |
1da177e4c Linux-2.6.12-rc2 |
796 797 798 |
* @c: unicode byte to echo * @tty: terminal device * |
4edf1827e n_tty: clean up o... |
799 |
* Echo user input back onto the screen. This must be called only when |
1da177e4c Linux-2.6.12-rc2 |
800 |
* L_ECHO(tty) is true. Called from the driver receive_buf path. |
17b820606 tty: Minor tidyup... |
801 |
* |
62b263585 n_tty: move echoc... |
802 803 |
* This variant tags control characters to be echoed as "^X" * (where X is the letter representing the control char). |
a88a69c91 n_tty: Fix loss o... |
804 805 |
* * Locking: echo_lock to protect the echo buffer |
1da177e4c Linux-2.6.12-rc2 |
806 807 808 809 |
*/ static void echo_char(unsigned char c, struct tty_struct *tty) { |
a88a69c91 n_tty: Fix loss o... |
810 811 812 813 814 815 |
mutex_lock(&tty->echo_lock); if (c == ECHO_OP_START) { add_echo_byte(ECHO_OP_START, tty); add_echo_byte(ECHO_OP_START, tty); } else { |
62b263585 n_tty: move echoc... |
816 |
if (L_ECHOCTL(tty) && iscntrl(c) && c != '\t') |
a88a69c91 n_tty: Fix loss o... |
817 818 819 820 821 |
add_echo_byte(ECHO_OP_START, tty); add_echo_byte(c, tty); } mutex_unlock(&tty->echo_lock); |
1da177e4c Linux-2.6.12-rc2 |
822 |
} |
17b820606 tty: Minor tidyup... |
823 |
/** |
a88a69c91 n_tty: Fix loss o... |
824 |
* finish_erasing - complete erase |
17b820606 tty: Minor tidyup... |
825 |
* @tty: tty doing the erase |
17b820606 tty: Minor tidyup... |
826 |
*/ |
a88a69c91 n_tty: Fix loss o... |
827 |
|
1da177e4c Linux-2.6.12-rc2 |
828 829 830 |
static inline void finish_erasing(struct tty_struct *tty) { if (tty->erasing) { |
a88a69c91 n_tty: Fix loss o... |
831 |
echo_char_raw('/', tty); |
1da177e4c Linux-2.6.12-rc2 |
832 833 834 835 836 837 838 839 840 |
tty->erasing = 0; } } /** * eraser - handle erase function * @c: character input * @tty: terminal device * |
3a4fa0a25 Fix misspellings ... |
841 |
* Perform erase and necessary output when an erase character is |
1da177e4c Linux-2.6.12-rc2 |
842 843 |
* present in the stream from the driver layer. Handles the complexities * of UTF-8 multibyte symbols. |
17b820606 tty: Minor tidyup... |
844 |
* |
a88a69c91 n_tty: Fix loss o... |
845 |
* Locking: read_lock for tty buffers |
1da177e4c Linux-2.6.12-rc2 |
846 |
*/ |
4edf1827e n_tty: clean up o... |
847 |
|
1da177e4c Linux-2.6.12-rc2 |
848 849 850 851 852 |
static void eraser(unsigned char c, struct tty_struct *tty) { enum { ERASE, WERASE, KILL } kill_type; int head, seen_alnums, cnt; unsigned long flags; |
17b820606 tty: Minor tidyup... |
853 |
/* FIXME: locking needed ? */ |
1da177e4c Linux-2.6.12-rc2 |
854 |
if (tty->read_head == tty->canon_head) { |
7e94b1d9b n_tty: Output bel... |
855 |
/* process_output('\a', tty); */ /* what do you think? */ |
1da177e4c Linux-2.6.12-rc2 |
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 |
return; } if (c == ERASE_CHAR(tty)) kill_type = ERASE; else if (c == WERASE_CHAR(tty)) kill_type = WERASE; else { if (!L_ECHO(tty)) { spin_lock_irqsave(&tty->read_lock, flags); tty->read_cnt -= ((tty->read_head - tty->canon_head) & (N_TTY_BUF_SIZE - 1)); tty->read_head = tty->canon_head; spin_unlock_irqrestore(&tty->read_lock, flags); return; } if (!L_ECHOK(tty) || !L_ECHOKE(tty) || !L_ECHOE(tty)) { spin_lock_irqsave(&tty->read_lock, flags); tty->read_cnt -= ((tty->read_head - tty->canon_head) & (N_TTY_BUF_SIZE - 1)); tty->read_head = tty->canon_head; spin_unlock_irqrestore(&tty->read_lock, flags); finish_erasing(tty); echo_char(KILL_CHAR(tty), tty); /* Add a newline if ECHOK is on and ECHOKE is off. */ if (L_ECHOK(tty)) |
a88a69c91 n_tty: Fix loss o... |
881 882 |
echo_char_raw(' ', tty); |
1da177e4c Linux-2.6.12-rc2 |
883 884 885 886 887 888 |
return; } kill_type = KILL; } seen_alnums = 0; |
17b820606 tty: Minor tidyup... |
889 |
/* FIXME: Locking ?? */ |
1da177e4c Linux-2.6.12-rc2 |
890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 |
while (tty->read_head != tty->canon_head) { head = tty->read_head; /* erase a single possibly multibyte character */ do { head = (head - 1) & (N_TTY_BUF_SIZE-1); c = tty->read_buf[head]; } while (is_continuation(c, tty) && head != tty->canon_head); /* do not partially erase */ if (is_continuation(c, tty)) break; if (kill_type == WERASE) { /* Equivalent to BSD's ALTWERASE. */ if (isalnum(c) || c == '_') seen_alnums++; else if (seen_alnums) break; } cnt = (tty->read_head - head) & (N_TTY_BUF_SIZE-1); spin_lock_irqsave(&tty->read_lock, flags); tty->read_head = head; tty->read_cnt -= cnt; spin_unlock_irqrestore(&tty->read_lock, flags); if (L_ECHO(tty)) { if (L_ECHOPRT(tty)) { if (!tty->erasing) { |
a88a69c91 n_tty: Fix loss o... |
918 |
echo_char_raw('\\', tty); |
1da177e4c Linux-2.6.12-rc2 |
919 920 921 922 923 924 |
tty->erasing = 1; } /* if cnt > 1, output a multi-byte character */ echo_char(c, tty); while (--cnt > 0) { head = (head+1) & (N_TTY_BUF_SIZE-1); |
a88a69c91 n_tty: Fix loss o... |
925 926 |
echo_char_raw(tty->read_buf[head], tty); echo_move_back_col(tty); |
1da177e4c Linux-2.6.12-rc2 |
927 928 929 930 |
} } else if (kill_type == ERASE && !L_ECHOE(tty)) { echo_char(ERASE_CHAR(tty), tty); } else if (c == '\t') { |
a88a69c91 n_tty: Fix loss o... |
931 932 933 934 935 936 937 938 939 940 941 942 943 |
unsigned int num_chars = 0; int after_tab = 0; unsigned long tail = tty->read_head; /* * Count the columns used for characters * since the start of input or after a * previous tab. * This info is used to go back the correct * number of columns. */ while (tail != tty->canon_head) { tail = (tail-1) & (N_TTY_BUF_SIZE-1); |
1da177e4c Linux-2.6.12-rc2 |
944 |
c = tty->read_buf[tail]; |
a88a69c91 n_tty: Fix loss o... |
945 946 947 |
if (c == '\t') { after_tab = 1; break; |
300a6204b n_tty: clean up c... |
948 |
} else if (iscntrl(c)) { |
1da177e4c Linux-2.6.12-rc2 |
949 |
if (L_ECHOCTL(tty)) |
a88a69c91 n_tty: Fix loss o... |
950 951 952 953 |
num_chars += 2; } else if (!is_continuation(c, tty)) { num_chars++; } |
1da177e4c Linux-2.6.12-rc2 |
954 |
} |
a88a69c91 n_tty: Fix loss o... |
955 |
echo_erase_tab(num_chars, after_tab, tty); |
1da177e4c Linux-2.6.12-rc2 |
956 957 |
} else { if (iscntrl(c) && L_ECHOCTL(tty)) { |
a88a69c91 n_tty: Fix loss o... |
958 959 960 |
echo_char_raw('\b', tty); echo_char_raw(' ', tty); echo_char_raw('\b', tty); |
1da177e4c Linux-2.6.12-rc2 |
961 962 |
} if (!iscntrl(c) || L_ECHOCTL(tty)) { |
a88a69c91 n_tty: Fix loss o... |
963 964 965 |
echo_char_raw('\b', tty); echo_char_raw(' ', tty); echo_char_raw('\b', tty); |
1da177e4c Linux-2.6.12-rc2 |
966 967 968 969 970 971 |
} } } if (kill_type == ERASE) break; } |
a88a69c91 n_tty: Fix loss o... |
972 |
if (tty->read_head == tty->canon_head && L_ECHO(tty)) |
1da177e4c Linux-2.6.12-rc2 |
973 974 975 976 977 978 979 980 981 982 983 984 985 |
finish_erasing(tty); } /** * isig - handle the ISIG optio * @sig: signal * @tty: terminal * @flush: force flush * * Called when a signal is being sent due to terminal input. This * may caus terminal flushing to take place according to the termios * settings and character used. Called from the driver receive_buf * path so serialized. |
17b820606 tty: Minor tidyup... |
986 987 |
* * Locking: ctrl_lock, read_lock (both via flush buffer) |
1da177e4c Linux-2.6.12-rc2 |
988 |
*/ |
4edf1827e n_tty: clean up o... |
989 |
|
1da177e4c Linux-2.6.12-rc2 |
990 991 |
static inline void isig(int sig, struct tty_struct *tty, int flush) { |
ab521dc0f [PATCH] tty: upda... |
992 993 |
if (tty->pgrp) kill_pgrp(tty->pgrp, sig, 1); |
1da177e4c Linux-2.6.12-rc2 |
994 995 |
if (flush || !L_NOFLSH(tty)) { n_tty_flush_buffer(tty); |
f34d7a5b7 tty: The big oper... |
996 |
tty_driver_flush_buffer(tty); |
1da177e4c Linux-2.6.12-rc2 |
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 |
} } /** * n_tty_receive_break - handle break * @tty: terminal * * An RS232 break event has been hit in the incoming bitstream. This * can cause a variety of events depending upon the termios settings. * * Called from the receive_buf path so single threaded. */ |
4edf1827e n_tty: clean up o... |
1009 |
|
1da177e4c Linux-2.6.12-rc2 |
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 |
static inline void n_tty_receive_break(struct tty_struct *tty) { if (I_IGNBRK(tty)) return; if (I_BRKINT(tty)) { isig(SIGINT, tty, 1); return; } if (I_PARMRK(tty)) { put_tty_queue('\377', tty); put_tty_queue('\0', tty); } put_tty_queue('\0', tty); wake_up_interruptible(&tty->read_wait); } /** * n_tty_receive_overrun - handle overrun reporting * @tty: terminal * * Data arrived faster than we could process it. While the tty * driver has flagged this the bits that were missed are gone * forever. * * Called from the receive_buf path so single threaded. Does not * need locking as num_overrun and overrun_time are function * private. */ |
4edf1827e n_tty: clean up o... |
1038 |
|
1da177e4c Linux-2.6.12-rc2 |
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 |
static inline void n_tty_receive_overrun(struct tty_struct *tty) { char buf[64]; tty->num_overrun++; if (time_before(tty->overrun_time, jiffies - HZ) || time_after(tty->overrun_time, jiffies)) { printk(KERN_WARNING "%s: %d input overrun(s) ", tty_name(tty, buf), tty->num_overrun); tty->overrun_time = jiffies; tty->num_overrun = 0; } } /** * n_tty_receive_parity_error - error notifier * @tty: terminal device * @c: character * * Process a parity error and queue the right data to indicate |
3a4fa0a25 Fix misspellings ... |
1061 |
* the error case if necessary. Locking as per n_tty_receive_buf. |
1da177e4c Linux-2.6.12-rc2 |
1062 1063 1064 1065 |
*/ static inline void n_tty_receive_parity_error(struct tty_struct *tty, unsigned char c) { |
4edf1827e n_tty: clean up o... |
1066 |
if (I_IGNPAR(tty)) |
1da177e4c Linux-2.6.12-rc2 |
1067 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 |
if (I_PARMRK(tty)) { put_tty_queue('\377', tty); put_tty_queue('\0', tty); put_tty_queue(c, tty); } else if (I_INPCK(tty)) put_tty_queue('\0', tty); else put_tty_queue(c, tty); wake_up_interruptible(&tty->read_wait); } /** * n_tty_receive_char - perform processing * @tty: terminal device * @c: character * * Process an individual character of input received from the driver. |
4edf1827e n_tty: clean up o... |
1085 |
* This is serialized with respect to itself by the rules for the |
1da177e4c Linux-2.6.12-rc2 |
1086 1087 1088 1089 1090 1091 |
* driver above. */ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c) { unsigned long flags; |
acc71bbad n_tty: Fix hanfli... |
1092 |
int parmrk; |
1da177e4c Linux-2.6.12-rc2 |
1093 1094 1095 1096 1097 |
if (tty->raw) { put_tty_queue(c, tty); return; } |
4edf1827e n_tty: clean up o... |
1098 |
|
1da177e4c Linux-2.6.12-rc2 |
1099 1100 1101 |
if (I_ISTRIP(tty)) c &= 0x7f; if (I_IUCLC(tty) && L_IEXTEN(tty)) |
300a6204b n_tty: clean up c... |
1102 |
c = tolower(c); |
1da177e4c Linux-2.6.12-rc2 |
1103 |
|
26df6d134 tty: Add EXTPROC ... |
1104 1105 1106 1107 |
if (L_EXTPROC(tty)) { put_tty_queue(c, tty); return; } |
54d2a37ed Fix IXANY and res... |
1108 |
if (tty->stopped && !tty->flow_stopped && I_IXON(tty) && |
a88a69c91 n_tty: Fix loss o... |
1109 1110 |
I_IXANY(tty) && c != START_CHAR(tty) && c != STOP_CHAR(tty) && c != INTR_CHAR(tty) && c != QUIT_CHAR(tty) && c != SUSP_CHAR(tty)) { |
54d2a37ed Fix IXANY and res... |
1111 |
start_tty(tty); |
a88a69c91 n_tty: Fix loss o... |
1112 1113 |
process_echoes(tty); } |
54d2a37ed Fix IXANY and res... |
1114 |
|
1da177e4c Linux-2.6.12-rc2 |
1115 1116 |
if (tty->closing) { if (I_IXON(tty)) { |
a88a69c91 n_tty: Fix loss o... |
1117 |
if (c == START_CHAR(tty)) { |
1da177e4c Linux-2.6.12-rc2 |
1118 |
start_tty(tty); |
a88a69c91 n_tty: Fix loss o... |
1119 |
process_echoes(tty); |
300a6204b n_tty: clean up c... |
1120 |
} else if (c == STOP_CHAR(tty)) |
1da177e4c Linux-2.6.12-rc2 |
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 |
stop_tty(tty); } return; } /* * If the previous character was LNEXT, or we know that this * character is not one of the characters that we'll have to * handle specially, do shortcut processing to speed things * up. */ if (!test_bit(c, tty->process_char_map) || tty->lnext) { |
1da177e4c Linux-2.6.12-rc2 |
1133 |
tty->lnext = 0; |
acc71bbad n_tty: Fix hanfli... |
1134 1135 1136 |
parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0; if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) { /* beep if no space */ |
7e94b1d9b n_tty: Output bel... |
1137 1138 |
if (L_ECHO(tty)) process_output('\a', tty); |
acc71bbad n_tty: Fix hanfli... |
1139 1140 1141 1142 |
return; } if (L_ECHO(tty)) { finish_erasing(tty); |
1da177e4c Linux-2.6.12-rc2 |
1143 1144 |
/* Record the column of first canon char. */ if (tty->canon_head == tty->read_head) |
a88a69c91 n_tty: Fix loss o... |
1145 |
echo_set_canon_col(tty); |
1da177e4c Linux-2.6.12-rc2 |
1146 |
echo_char(c, tty); |
a88a69c91 n_tty: Fix loss o... |
1147 |
process_echoes(tty); |
1da177e4c Linux-2.6.12-rc2 |
1148 |
} |
acc71bbad n_tty: Fix hanfli... |
1149 |
if (parmrk) |
1da177e4c Linux-2.6.12-rc2 |
1150 1151 1152 1153 |
put_tty_queue(c, tty); put_tty_queue(c, tty); return; } |
4edf1827e n_tty: clean up o... |
1154 |
|
1da177e4c Linux-2.6.12-rc2 |
1155 1156 1157 |
if (I_IXON(tty)) { if (c == START_CHAR(tty)) { start_tty(tty); |
a88a69c91 n_tty: Fix loss o... |
1158 |
process_echoes(tty); |
1da177e4c Linux-2.6.12-rc2 |
1159 1160 1161 1162 1163 1164 1165 |
return; } if (c == STOP_CHAR(tty)) { stop_tty(tty); return; } } |
575537b32 Resume TTY on SUS... |
1166 |
|
1da177e4c Linux-2.6.12-rc2 |
1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 |
if (L_ISIG(tty)) { int signal; signal = SIGINT; if (c == INTR_CHAR(tty)) goto send_signal; signal = SIGQUIT; if (c == QUIT_CHAR(tty)) goto send_signal; signal = SIGTSTP; if (c == SUSP_CHAR(tty)) { send_signal: |
ec5b1157f tty: enable the e... |
1178 |
/* |
ec5b1157f tty: enable the e... |
1179 1180 1181 1182 1183 1184 |
* Note that we do not use isig() here because we want * the order to be: * 1) flush, 2) echo, 3) signal */ if (!L_NOFLSH(tty)) { n_tty_flush_buffer(tty); |
f34d7a5b7 tty: The big oper... |
1185 |
tty_driver_flush_buffer(tty); |
ec5b1157f tty: enable the e... |
1186 |
} |
a88a69c91 n_tty: Fix loss o... |
1187 1188 1189 |
if (I_IXON(tty)) start_tty(tty); if (L_ECHO(tty)) { |
ec5b1157f tty: enable the e... |
1190 |
echo_char(c, tty); |
a88a69c91 n_tty: Fix loss o... |
1191 1192 |
process_echoes(tty); } |
ec5b1157f tty: enable the e... |
1193 1194 |
if (tty->pgrp) kill_pgrp(tty->pgrp, signal, 1); |
1da177e4c Linux-2.6.12-rc2 |
1195 1196 1197 |
return; } } |
575537b32 Resume TTY on SUS... |
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 |
if (c == '\r') { if (I_IGNCR(tty)) return; if (I_ICRNL(tty)) c = ' '; } else if (c == ' ' && I_INLCR(tty)) c = '\r'; |
1da177e4c Linux-2.6.12-rc2 |
1208 1209 1210 1211 |
if (tty->icanon) { if (c == ERASE_CHAR(tty) || c == KILL_CHAR(tty) || (c == WERASE_CHAR(tty) && L_IEXTEN(tty))) { eraser(c, tty); |
a88a69c91 n_tty: Fix loss o... |
1212 |
process_echoes(tty); |
1da177e4c Linux-2.6.12-rc2 |
1213 1214 1215 1216 1217 1218 1219 |
return; } if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) { tty->lnext = 1; if (L_ECHO(tty)) { finish_erasing(tty); if (L_ECHOCTL(tty)) { |
a88a69c91 n_tty: Fix loss o... |
1220 1221 1222 |
echo_char_raw('^', tty); echo_char_raw('\b', tty); process_echoes(tty); |
1da177e4c Linux-2.6.12-rc2 |
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 |
} } return; } if (c == REPRINT_CHAR(tty) && L_ECHO(tty) && L_IEXTEN(tty)) { unsigned long tail = tty->canon_head; finish_erasing(tty); echo_char(c, tty); |
a88a69c91 n_tty: Fix loss o... |
1233 1234 |
echo_char_raw(' ', tty); |
1da177e4c Linux-2.6.12-rc2 |
1235 1236 1237 1238 |
while (tail != tty->read_head) { echo_char(tty->read_buf[tail], tty); tail = (tail+1) & (N_TTY_BUF_SIZE-1); } |
a88a69c91 n_tty: Fix loss o... |
1239 |
process_echoes(tty); |
1da177e4c Linux-2.6.12-rc2 |
1240 1241 1242 1243 |
return; } if (c == ' ') { |
acc71bbad n_tty: Fix hanfli... |
1244 |
if (tty->read_cnt >= N_TTY_BUF_SIZE) { |
7e94b1d9b n_tty: Output bel... |
1245 1246 |
if (L_ECHO(tty)) process_output('\a', tty); |
acc71bbad n_tty: Fix hanfli... |
1247 1248 1249 |
return; } if (L_ECHO(tty) || L_ECHONL(tty)) { |
a88a69c91 n_tty: Fix loss o... |
1250 1251 1252 |
echo_char_raw(' ', tty); process_echoes(tty); |
1da177e4c Linux-2.6.12-rc2 |
1253 1254 1255 1256 |
} goto handle_newline; } if (c == EOF_CHAR(tty)) { |
acc71bbad n_tty: Fix hanfli... |
1257 1258 |
if (tty->read_cnt >= N_TTY_BUF_SIZE) return; |
4edf1827e n_tty: clean up o... |
1259 1260 |
if (tty->canon_head != tty->read_head) set_bit(TTY_PUSH, &tty->flags); |
1da177e4c Linux-2.6.12-rc2 |
1261 1262 1263 1264 1265 |
c = __DISABLED_CHAR; goto handle_newline; } if ((c == EOL_CHAR(tty)) || (c == EOL2_CHAR(tty) && L_IEXTEN(tty))) { |
acc71bbad n_tty: Fix hanfli... |
1266 1267 1268 |
parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0; if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk)) { |
7e94b1d9b n_tty: Output bel... |
1269 1270 |
if (L_ECHO(tty)) process_output('\a', tty); |
acc71bbad n_tty: Fix hanfli... |
1271 1272 |
return; } |
1da177e4c Linux-2.6.12-rc2 |
1273 1274 1275 1276 |
/* * XXX are EOL_CHAR and EOL2_CHAR echoed?!? */ if (L_ECHO(tty)) { |
1da177e4c Linux-2.6.12-rc2 |
1277 1278 |
/* Record the column of first canon char. */ if (tty->canon_head == tty->read_head) |
a88a69c91 n_tty: Fix loss o... |
1279 |
echo_set_canon_col(tty); |
1da177e4c Linux-2.6.12-rc2 |
1280 |
echo_char(c, tty); |
a88a69c91 n_tty: Fix loss o... |
1281 |
process_echoes(tty); |
1da177e4c Linux-2.6.12-rc2 |
1282 1283 1284 1285 1286 |
} /* * XXX does PARMRK doubling happen for * EOL_CHAR and EOL2_CHAR? */ |
acc71bbad n_tty: Fix hanfli... |
1287 |
if (parmrk) |
1da177e4c Linux-2.6.12-rc2 |
1288 |
put_tty_queue(c, tty); |
4edf1827e n_tty: clean up o... |
1289 |
handle_newline: |
1da177e4c Linux-2.6.12-rc2 |
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 |
spin_lock_irqsave(&tty->read_lock, flags); set_bit(tty->read_head, tty->read_flags); put_tty_queue_nolock(c, tty); tty->canon_head = tty->read_head; tty->canon_data++; spin_unlock_irqrestore(&tty->read_lock, flags); kill_fasync(&tty->fasync, SIGIO, POLL_IN); if (waitqueue_active(&tty->read_wait)) wake_up_interruptible(&tty->read_wait); return; } } |
4edf1827e n_tty: clean up o... |
1302 |
|
acc71bbad n_tty: Fix hanfli... |
1303 1304 1305 |
parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0; if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) { /* beep if no space */ |
7e94b1d9b n_tty: Output bel... |
1306 1307 |
if (L_ECHO(tty)) process_output('\a', tty); |
acc71bbad n_tty: Fix hanfli... |
1308 1309 1310 1311 |
return; } if (L_ECHO(tty)) { finish_erasing(tty); |
1da177e4c Linux-2.6.12-rc2 |
1312 1313 |
if (c == ' ') |
a88a69c91 n_tty: Fix loss o... |
1314 1315 |
echo_char_raw(' ', tty); |
1da177e4c Linux-2.6.12-rc2 |
1316 1317 1318 |
else { /* Record the column of first canon char. */ if (tty->canon_head == tty->read_head) |
a88a69c91 n_tty: Fix loss o... |
1319 |
echo_set_canon_col(tty); |
1da177e4c Linux-2.6.12-rc2 |
1320 1321 |
echo_char(c, tty); } |
a88a69c91 n_tty: Fix loss o... |
1322 |
process_echoes(tty); |
1da177e4c Linux-2.6.12-rc2 |
1323 |
} |
acc71bbad n_tty: Fix hanfli... |
1324 |
if (parmrk) |
1da177e4c Linux-2.6.12-rc2 |
1325 1326 1327 |
put_tty_queue(c, tty); put_tty_queue(c, tty); |
4edf1827e n_tty: clean up o... |
1328 |
} |
1da177e4c Linux-2.6.12-rc2 |
1329 |
|
1da177e4c Linux-2.6.12-rc2 |
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 |
/** * n_tty_write_wakeup - asynchronous I/O notifier * @tty: tty device * * Required for the ptys, serial driver etc. since processes * that attach themselves to the master and rely on ASYNC * IO must be woken up */ static void n_tty_write_wakeup(struct tty_struct *tty) { |
ff8cb0fd6 tty: N_TTY SIGIO ... |
1342 |
if (tty->fasync && test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) |
1da177e4c Linux-2.6.12-rc2 |
1343 |
kill_fasync(&tty->fasync, SIGIO, POLL_OUT); |
1da177e4c Linux-2.6.12-rc2 |
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 |
} /** * n_tty_receive_buf - data receive * @tty: terminal device * @cp: buffer * @fp: flag buffer * @count: characters * * Called by the terminal driver when a block of characters has * been received. This function must be called from soft contexts * not from interrupt context. The driver is responsible for making * calls one at a time and in order (or using flush_to_ldisc) */ |
4edf1827e n_tty: clean up o... |
1358 |
|
55db4c64e Revert "tty: make... |
1359 1360 |
static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count) |
1da177e4c Linux-2.6.12-rc2 |
1361 1362 1363 1364 1365 1366 1367 1368 |
{ const unsigned char *p; char *f, flags = TTY_NORMAL; int i; char buf[64]; unsigned long cpuflags; if (!tty->read_buf) |
55db4c64e Revert "tty: make... |
1369 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 |
if (tty->real_raw) { spin_lock_irqsave(&tty->read_lock, cpuflags); i = min(N_TTY_BUF_SIZE - tty->read_cnt, N_TTY_BUF_SIZE - tty->read_head); i = min(count, i); memcpy(tty->read_buf + tty->read_head, cp, i); tty->read_head = (tty->read_head + i) & (N_TTY_BUF_SIZE-1); tty->read_cnt += i; cp += i; count -= i; i = min(N_TTY_BUF_SIZE - tty->read_cnt, N_TTY_BUF_SIZE - tty->read_head); i = min(count, i); memcpy(tty->read_buf + tty->read_head, cp, i); tty->read_head = (tty->read_head + i) & (N_TTY_BUF_SIZE-1); tty->read_cnt += i; spin_unlock_irqrestore(&tty->read_lock, cpuflags); } else { |
4edf1827e n_tty: clean up o... |
1390 |
for (i = count, p = cp, f = fp; i; i--, p++) { |
1da177e4c Linux-2.6.12-rc2 |
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 |
if (f) flags = *f++; switch (flags) { case TTY_NORMAL: n_tty_receive_char(tty, *p); break; case TTY_BREAK: n_tty_receive_break(tty); break; case TTY_PARITY: case TTY_FRAME: n_tty_receive_parity_error(tty, *p); break; case TTY_OVERRUN: n_tty_receive_overrun(tty); break; default: |
4edf1827e n_tty: clean up o... |
1408 1409 |
printk(KERN_ERR "%s: unknown flag %d ", |
1da177e4c Linux-2.6.12-rc2 |
1410 1411 1412 1413 |
tty_name(tty, buf), flags); break; } } |
f34d7a5b7 tty: The big oper... |
1414 1415 |
if (tty->ops->flush_chars) tty->ops->flush_chars(tty); |
1da177e4c Linux-2.6.12-rc2 |
1416 |
} |
55db4c64e Revert "tty: make... |
1417 |
n_tty_set_room(tty); |
26df6d134 tty: Add EXTPROC ... |
1418 1419 |
if ((!tty->icanon && (tty->read_cnt >= tty->minimum_to_wake)) || L_EXTPROC(tty)) { |
1da177e4c Linux-2.6.12-rc2 |
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 |
kill_fasync(&tty->fasync, SIGIO, POLL_IN); if (waitqueue_active(&tty->read_wait)) wake_up_interruptible(&tty->read_wait); } /* * Check the remaining room for the input canonicalization * mode. We don't want to throttle the driver if we're in * canonical mode and don't have a newline yet! */ |
55db4c64e Revert "tty: make... |
1430 |
if (tty->receive_room < TTY_THRESHOLD_THROTTLE) |
39c2e60f8 tty: add throttle... |
1431 |
tty_throttle(tty); |
1da177e4c Linux-2.6.12-rc2 |
1432 1433 1434 1435 1436 |
} int is_ignored(int sig) { return (sigismember(¤t->blocked, sig) || |
4edf1827e n_tty: clean up o... |
1437 |
current->sighand->action[sig-1].sa.sa_handler == SIG_IGN); |
1da177e4c Linux-2.6.12-rc2 |
1438 1439 1440 1441 1442 1443 1444 1445 1446 |
} /** * n_tty_set_termios - termios data changed * @tty: terminal * @old: previous data * * Called by the tty layer when the user changes termios flags so * that the line discipline can plan ahead. This function cannot sleep |
4edf1827e n_tty: clean up o... |
1447 |
* and is protected from re-entry by the tty layer. The user is |
1da177e4c Linux-2.6.12-rc2 |
1448 1449 |
* guaranteed that this function will not be re-entered or in progress * when the ldisc is closed. |
17b820606 tty: Minor tidyup... |
1450 1451 |
* * Locking: Caller holds tty->termios_mutex |
1da177e4c Linux-2.6.12-rc2 |
1452 |
*/ |
4edf1827e n_tty: clean up o... |
1453 1454 |
static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old) |
1da177e4c Linux-2.6.12-rc2 |
1455 |
{ |
47afa7a5a tty: some ICANON ... |
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 |
int canon_change = 1; BUG_ON(!tty); if (old) canon_change = (old->c_lflag ^ tty->termios->c_lflag) & ICANON; if (canon_change) { memset(&tty->read_flags, 0, sizeof tty->read_flags); tty->canon_head = tty->read_tail; tty->canon_data = 0; tty->erasing = 0; } if (canon_change && !L_ICANON(tty) && tty->read_cnt) wake_up_interruptible(&tty->read_wait); |
4edf1827e n_tty: clean up o... |
1470 |
|
1da177e4c Linux-2.6.12-rc2 |
1471 1472 1473 1474 |
tty->icanon = (L_ICANON(tty) != 0); if (test_bit(TTY_HW_COOK_IN, &tty->flags)) { tty->raw = 1; tty->real_raw = 1; |
55db4c64e Revert "tty: make... |
1475 |
n_tty_set_room(tty); |
1da177e4c Linux-2.6.12-rc2 |
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 |
return; } if (I_ISTRIP(tty) || I_IUCLC(tty) || I_IGNCR(tty) || I_ICRNL(tty) || I_INLCR(tty) || L_ICANON(tty) || I_IXON(tty) || L_ISIG(tty) || L_ECHO(tty) || I_PARMRK(tty)) { memset(tty->process_char_map, 0, 256/8); if (I_IGNCR(tty) || I_ICRNL(tty)) set_bit('\r', tty->process_char_map); if (I_INLCR(tty)) set_bit(' ', tty->process_char_map); if (L_ICANON(tty)) { set_bit(ERASE_CHAR(tty), tty->process_char_map); set_bit(KILL_CHAR(tty), tty->process_char_map); set_bit(EOF_CHAR(tty), tty->process_char_map); set_bit(' ', tty->process_char_map); set_bit(EOL_CHAR(tty), tty->process_char_map); if (L_IEXTEN(tty)) { set_bit(WERASE_CHAR(tty), tty->process_char_map); set_bit(LNEXT_CHAR(tty), tty->process_char_map); set_bit(EOL2_CHAR(tty), tty->process_char_map); if (L_ECHO(tty)) set_bit(REPRINT_CHAR(tty), tty->process_char_map); } } if (I_IXON(tty)) { set_bit(START_CHAR(tty), tty->process_char_map); set_bit(STOP_CHAR(tty), tty->process_char_map); } if (L_ISIG(tty)) { set_bit(INTR_CHAR(tty), tty->process_char_map); set_bit(QUIT_CHAR(tty), tty->process_char_map); set_bit(SUSP_CHAR(tty), tty->process_char_map); } clear_bit(__DISABLED_CHAR, tty->process_char_map); tty->raw = 0; tty->real_raw = 0; } else { tty->raw = 1; if ((I_IGNBRK(tty) || (!I_BRKINT(tty) && !I_PARMRK(tty))) && (I_IGNPAR(tty) || !I_INPCK(tty)) && (tty->driver->flags & TTY_DRIVER_REAL_RAW)) tty->real_raw = 1; else tty->real_raw = 0; } |
55db4c64e Revert "tty: make... |
1530 |
n_tty_set_room(tty); |
f34d7a5b7 tty: The big oper... |
1531 1532 1533 |
/* The termios change make the tty ready for I/O */ wake_up_interruptible(&tty->write_wait); wake_up_interruptible(&tty->read_wait); |
1da177e4c Linux-2.6.12-rc2 |
1534 1535 1536 1537 1538 1539 |
} /** * n_tty_close - close the ldisc for this tty * @tty: device * |
4edf1827e n_tty: clean up o... |
1540 1541 |
* Called from the terminal layer when this line discipline is * being shut down, either because of a close or becsuse of a |
1da177e4c Linux-2.6.12-rc2 |
1542 1543 1544 |
* discipline change. The function will not be called while other * ldisc methods are in progress. */ |
4edf1827e n_tty: clean up o... |
1545 |
|
1da177e4c Linux-2.6.12-rc2 |
1546 1547 1548 1549 |
static void n_tty_close(struct tty_struct *tty) { n_tty_flush_buffer(tty); if (tty->read_buf) { |
0b4068a12 tty: simplify buf... |
1550 |
kfree(tty->read_buf); |
1da177e4c Linux-2.6.12-rc2 |
1551 1552 |
tty->read_buf = NULL; } |
a88a69c91 n_tty: Fix loss o... |
1553 |
if (tty->echo_buf) { |
0b4068a12 tty: simplify buf... |
1554 |
kfree(tty->echo_buf); |
a88a69c91 n_tty: Fix loss o... |
1555 1556 |
tty->echo_buf = NULL; } |
1da177e4c Linux-2.6.12-rc2 |
1557 1558 1559 1560 1561 1562 |
} /** * n_tty_open - open an ldisc * @tty: terminal to open * |
4edf1827e n_tty: clean up o... |
1563 |
* Called when this line discipline is being attached to the |
1da177e4c Linux-2.6.12-rc2 |
1564 1565 1566 1567 1568 1569 1570 1571 1572 |
* terminal device. Can sleep. Called serialized so that no * other events will occur in parallel. No further open will occur * until a close. */ static int n_tty_open(struct tty_struct *tty) { if (!tty) return -EINVAL; |
a88a69c91 n_tty: Fix loss o... |
1573 |
/* These are ugly. Currently a malloc failure here can panic */ |
1da177e4c Linux-2.6.12-rc2 |
1574 |
if (!tty->read_buf) { |
0b4068a12 tty: simplify buf... |
1575 |
tty->read_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1576 1577 1578 |
if (!tty->read_buf) return -ENOMEM; } |
a88a69c91 n_tty: Fix loss o... |
1579 |
if (!tty->echo_buf) { |
0b4068a12 tty: simplify buf... |
1580 |
tty->echo_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL); |
a88a69c91 n_tty: Fix loss o... |
1581 1582 1583 |
if (!tty->echo_buf) return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
1584 |
reset_buffer_flags(tty); |
7b292b4bf tty: fix "IRQ45: ... |
1585 |
tty_unthrottle(tty); |
1da177e4c Linux-2.6.12-rc2 |
1586 1587 1588 1589 1590 1591 1592 1593 1594 |
tty->column = 0; n_tty_set_termios(tty, NULL); tty->minimum_to_wake = 1; tty->closing = 0; return 0; } static inline int input_available_p(struct tty_struct *tty, int amt) { |
e043e42bd pty: avoid forcin... |
1595 |
tty_flush_to_ldisc(tty); |
26df6d134 tty: Add EXTPROC ... |
1596 |
if (tty->icanon && !L_EXTPROC(tty)) { |
1da177e4c Linux-2.6.12-rc2 |
1597 1598 1599 1600 1601 1602 1603 1604 1605 |
if (tty->canon_data) return 1; } else if (tty->read_cnt >= (amt ? amt : 1)) return 1; return 0; } /** |
bbd20759d drivers/tty: Remo... |
1606 |
* copy_from_read_buf - copy read data directly |
1da177e4c Linux-2.6.12-rc2 |
1607 1608 1609 1610 |
* @tty: terminal device * @b: user data * @nr: size of data * |
11a96d182 tty: rename the r... |
1611 |
* Helper function to speed up n_tty_read. It is only called when |
1da177e4c Linux-2.6.12-rc2 |
1612 1613 1614 1615 1616 1617 |
* ICANON is off; it copies characters straight from the tty queue to * user space directly. It can be profitably called twice; once to * drain the space from the tail pointer to the (physical) end of the * buffer, and once to drain the space from the (physical) beginning of * the buffer to head pointer. * |
817d6d3bc [PATCH] remove TT... |
1618 |
* Called under the tty->atomic_read_lock sem |
1da177e4c Linux-2.6.12-rc2 |
1619 1620 |
* */ |
4edf1827e n_tty: clean up o... |
1621 |
|
33f0f88f1 [PATCH] TTY layer... |
1622 |
static int copy_from_read_buf(struct tty_struct *tty, |
1da177e4c Linux-2.6.12-rc2 |
1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 |
unsigned char __user **b, size_t *nr) { int retval; size_t n; unsigned long flags; retval = 0; spin_lock_irqsave(&tty->read_lock, flags); n = min(tty->read_cnt, N_TTY_BUF_SIZE - tty->read_tail); n = min(*nr, n); spin_unlock_irqrestore(&tty->read_lock, flags); if (n) { |
1da177e4c Linux-2.6.12-rc2 |
1637 1638 |
retval = copy_to_user(*b, &tty->read_buf[tty->read_tail], n); n -= retval; |
522ed7767 Audit: add TTY in... |
1639 |
tty_audit_add_data(tty, &tty->read_buf[tty->read_tail], n); |
1da177e4c Linux-2.6.12-rc2 |
1640 1641 1642 |
spin_lock_irqsave(&tty->read_lock, flags); tty->read_tail = (tty->read_tail + n) & (N_TTY_BUF_SIZE-1); tty->read_cnt -= n; |
26df6d134 tty: Add EXTPROC ... |
1643 1644 1645 1646 1647 |
/* Turn single EOF into zero-length read */ if (L_EXTPROC(tty) && tty->icanon && n == 1) { if (!tty->read_cnt && (*b)[n-1] == EOF_CHAR(tty)) n--; } |
1da177e4c Linux-2.6.12-rc2 |
1648 1649 1650 1651 1652 1653 |
spin_unlock_irqrestore(&tty->read_lock, flags); *b += n; *nr -= n; } return retval; } |
cc4191dc1 drivers/char/n_tt... |
1654 |
extern ssize_t redirected_tty_write(struct file *, const char __user *, |
4edf1827e n_tty: clean up o... |
1655 |
size_t, loff_t *); |
1da177e4c Linux-2.6.12-rc2 |
1656 1657 1658 1659 1660 1661 1662 |
/** * job_control - check job control * @tty: tty * @file: file handle * * Perform job control management checks on this file/tty descriptor |
4edf1827e n_tty: clean up o... |
1663 |
* and if appropriate send any needed signals and return a negative |
1da177e4c Linux-2.6.12-rc2 |
1664 |
* error code if action should be taken. |
04f378b19 tty: BKL pushdown |
1665 1666 1667 1668 1669 |
* * FIXME: * Locking: None - redirected write test is safe, testing * current->signal should possibly lock current->sighand * pgrp locking ? |
1da177e4c Linux-2.6.12-rc2 |
1670 |
*/ |
4edf1827e n_tty: clean up o... |
1671 |
|
1da177e4c Linux-2.6.12-rc2 |
1672 1673 1674 1675 1676 1677 1678 1679 1680 |
static int job_control(struct tty_struct *tty, struct file *file) { /* Job control check -- must be done at start and after every sleep (POSIX.1 7.1.1.4). */ /* NOTE: not yet done after every sleep pending a thorough check of the logic of this change. -- jlc */ /* don't stop on /dev/console */ if (file->f_op->write != redirected_tty_write && current->signal->tty == tty) { |
ab521dc0f [PATCH] tty: upda... |
1681 |
if (!tty->pgrp) |
11a96d182 tty: rename the r... |
1682 1683 |
printk(KERN_ERR "n_tty_read: no tty->pgrp! "); |
ab521dc0f [PATCH] tty: upda... |
1684 |
else if (task_pgrp(current) != tty->pgrp) { |
1da177e4c Linux-2.6.12-rc2 |
1685 |
if (is_ignored(SIGTTIN) || |
3e7cd6c41 [PATCH] pid: repl... |
1686 |
is_current_pgrp_orphaned()) |
1da177e4c Linux-2.6.12-rc2 |
1687 |
return -EIO; |
ab521dc0f [PATCH] tty: upda... |
1688 |
kill_pgrp(task_pgrp(current), SIGTTIN, 1); |
040b6362d tty: fix leakage ... |
1689 |
set_thread_flag(TIF_SIGPENDING); |
1da177e4c Linux-2.6.12-rc2 |
1690 1691 1692 1693 1694 |
return -ERESTARTSYS; } } return 0; } |
4edf1827e n_tty: clean up o... |
1695 |
|
1da177e4c Linux-2.6.12-rc2 |
1696 1697 |
/** |
11a96d182 tty: rename the r... |
1698 |
* n_tty_read - read function for tty |
1da177e4c Linux-2.6.12-rc2 |
1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 |
* @tty: tty device * @file: file object * @buf: userspace buffer pointer * @nr: size of I/O * * Perform reads for the line discipline. We are guaranteed that the * line discipline will not be closed under us but we may get multiple * parallel readers and must handle this ourselves. We may also get * a hangup. Always called in user context, may sleep. * * This code must be sure never to sleep through a hangup. */ |
4edf1827e n_tty: clean up o... |
1711 |
|
11a96d182 tty: rename the r... |
1712 |
static ssize_t n_tty_read(struct tty_struct *tty, struct file *file, |
1da177e4c Linux-2.6.12-rc2 |
1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 |
unsigned char __user *buf, size_t nr) { unsigned char __user *b = buf; DECLARE_WAITQUEUE(wait, current); int c; int minimum, time; ssize_t retval = 0; ssize_t size; long timeout; unsigned long flags; |
04f378b19 tty: BKL pushdown |
1723 |
int packet; |
1da177e4c Linux-2.6.12-rc2 |
1724 1725 |
do_it_again: |
17b820606 tty: Minor tidyup... |
1726 |
BUG_ON(!tty->read_buf); |
1da177e4c Linux-2.6.12-rc2 |
1727 1728 |
c = job_control(tty, file); |
4edf1827e n_tty: clean up o... |
1729 |
if (c < 0) |
1da177e4c Linux-2.6.12-rc2 |
1730 |
return c; |
4edf1827e n_tty: clean up o... |
1731 |
|
1da177e4c Linux-2.6.12-rc2 |
1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 |
minimum = time = 0; timeout = MAX_SCHEDULE_TIMEOUT; if (!tty->icanon) { time = (HZ / 10) * TIME_CHAR(tty); minimum = MIN_CHAR(tty); if (minimum) { if (time) tty->minimum_to_wake = 1; else if (!waitqueue_active(&tty->read_wait) || (tty->minimum_to_wake > minimum)) tty->minimum_to_wake = minimum; } else { timeout = 0; if (time) { timeout = time; time = 0; } tty->minimum_to_wake = minimum = 1; } } /* * Internal serialization of reads. */ if (file->f_flags & O_NONBLOCK) { |
70522e121 [PATCH] sem2mutex... |
1757 |
if (!mutex_trylock(&tty->atomic_read_lock)) |
1da177e4c Linux-2.6.12-rc2 |
1758 |
return -EAGAIN; |
4edf1827e n_tty: clean up o... |
1759 |
} else { |
70522e121 [PATCH] sem2mutex... |
1760 |
if (mutex_lock_interruptible(&tty->atomic_read_lock)) |
1da177e4c Linux-2.6.12-rc2 |
1761 1762 |
return -ERESTARTSYS; } |
04f378b19 tty: BKL pushdown |
1763 |
packet = tty->packet; |
1da177e4c Linux-2.6.12-rc2 |
1764 1765 |
add_wait_queue(&tty->read_wait, &wait); |
1da177e4c Linux-2.6.12-rc2 |
1766 1767 |
while (nr) { /* First test for status change. */ |
04f378b19 tty: BKL pushdown |
1768 |
if (packet && tty->link->ctrl_status) { |
1da177e4c Linux-2.6.12-rc2 |
1769 1770 1771 |
unsigned char cs; if (b != buf) break; |
04f378b19 tty: BKL pushdown |
1772 |
spin_lock_irqsave(&tty->link->ctrl_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
1773 1774 |
cs = tty->link->ctrl_status; tty->link->ctrl_status = 0; |
04f378b19 tty: BKL pushdown |
1775 |
spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); |
522ed7767 Audit: add TTY in... |
1776 |
if (tty_put_user(tty, cs, b++)) { |
1da177e4c Linux-2.6.12-rc2 |
1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 |
retval = -EFAULT; b--; break; } nr--; break; } /* This statement must be first before checking for input so that any interrupt will set the state back to TASK_RUNNING. */ set_current_state(TASK_INTERRUPTIBLE); |
4edf1827e n_tty: clean up o... |
1788 |
|
1da177e4c Linux-2.6.12-rc2 |
1789 1790 1791 |
if (((minimum - (b - buf)) < tty->minimum_to_wake) && ((minimum - (b - buf)) >= 1)) tty->minimum_to_wake = (minimum - (b - buf)); |
4edf1827e n_tty: clean up o... |
1792 |
|
1da177e4c Linux-2.6.12-rc2 |
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 |
if (!input_available_p(tty, 0)) { if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) { retval = -EIO; break; } if (tty_hung_up_p(file)) break; if (!timeout) break; if (file->f_flags & O_NONBLOCK) { retval = -EAGAIN; break; } if (signal_pending(current)) { retval = -ERESTARTSYS; break; } |
55db4c64e Revert "tty: make... |
1810 1811 |
/* FIXME: does n_tty_set_room need locking ? */ n_tty_set_room(tty); |
1da177e4c Linux-2.6.12-rc2 |
1812 |
timeout = schedule_timeout(timeout); |
287262868 TTY: ntty, add on... |
1813 |
BUG_ON(!tty->read_buf); |
1da177e4c Linux-2.6.12-rc2 |
1814 1815 1816 1817 1818 |
continue; } __set_current_state(TASK_RUNNING); /* Deal with packet mode. */ |
04f378b19 tty: BKL pushdown |
1819 |
if (packet && b == buf) { |
522ed7767 Audit: add TTY in... |
1820 |
if (tty_put_user(tty, TIOCPKT_DATA, b++)) { |
1da177e4c Linux-2.6.12-rc2 |
1821 1822 1823 1824 1825 1826 |
retval = -EFAULT; b--; break; } nr--; } |
26df6d134 tty: Add EXTPROC ... |
1827 |
if (tty->icanon && !L_EXTPROC(tty)) { |
1da177e4c Linux-2.6.12-rc2 |
1828 1829 |
/* N.B. avoid overrun if nr == 0 */ while (nr && tty->read_cnt) { |
4edf1827e n_tty: clean up o... |
1830 |
int eol; |
1da177e4c Linux-2.6.12-rc2 |
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 |
eol = test_and_clear_bit(tty->read_tail, tty->read_flags); c = tty->read_buf[tty->read_tail]; spin_lock_irqsave(&tty->read_lock, flags); tty->read_tail = ((tty->read_tail+1) & (N_TTY_BUF_SIZE-1)); tty->read_cnt--; if (eol) { /* this test should be redundant: * we shouldn't be reading data if * canon_data is 0 */ if (--tty->canon_data < 0) tty->canon_data = 0; } spin_unlock_irqrestore(&tty->read_lock, flags); if (!eol || (c != __DISABLED_CHAR)) { |
522ed7767 Audit: add TTY in... |
1850 |
if (tty_put_user(tty, c, b++)) { |
1da177e4c Linux-2.6.12-rc2 |
1851 1852 1853 1854 1855 1856 |
retval = -EFAULT; b--; break; } nr--; } |
522ed7767 Audit: add TTY in... |
1857 1858 |
if (eol) { tty_audit_push(tty); |
1da177e4c Linux-2.6.12-rc2 |
1859 |
break; |
522ed7767 Audit: add TTY in... |
1860 |
} |
1da177e4c Linux-2.6.12-rc2 |
1861 1862 1863 1864 1865 |
} if (retval) break; } else { int uncopied; |
04f378b19 tty: BKL pushdown |
1866 1867 |
/* The copy function takes the read lock and handles locking internally for this case */ |
1da177e4c Linux-2.6.12-rc2 |
1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 |
uncopied = copy_from_read_buf(tty, &b, &nr); uncopied += copy_from_read_buf(tty, &b, &nr); if (uncopied) { retval = -EFAULT; break; } } /* If there is enough space in the read buffer now, let the * low-level driver know. We use n_tty_chars_in_buffer() to * check the buffer, as it now knows about canonical mode. * Otherwise, if the driver is throttled and the line is * longer than TTY_THRESHOLD_UNTHROTTLE in canonical mode, * we won't get any more characters. */ |
55db4c64e Revert "tty: make... |
1883 1884 |
if (n_tty_chars_in_buffer(tty) <= TTY_THRESHOLD_UNTHROTTLE) { n_tty_set_room(tty); |
1da177e4c Linux-2.6.12-rc2 |
1885 |
check_unthrottle(tty); |
55db4c64e Revert "tty: make... |
1886 |
} |
1da177e4c Linux-2.6.12-rc2 |
1887 1888 1889 1890 1891 1892 |
if (b - buf >= minimum) break; if (time) timeout = time; } |
70522e121 [PATCH] sem2mutex... |
1893 |
mutex_unlock(&tty->atomic_read_lock); |
1da177e4c Linux-2.6.12-rc2 |
1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 |
remove_wait_queue(&tty->read_wait, &wait); if (!waitqueue_active(&tty->read_wait)) tty->minimum_to_wake = minimum; __set_current_state(TASK_RUNNING); size = b - buf; if (size) { retval = size; if (nr) |
4edf1827e n_tty: clean up o... |
1904 |
clear_bit(TTY_PUSH, &tty->flags); |
1da177e4c Linux-2.6.12-rc2 |
1905 |
} else if (test_and_clear_bit(TTY_PUSH, &tty->flags)) |
bbd20759d drivers/tty: Remo... |
1906 |
goto do_it_again; |
1da177e4c Linux-2.6.12-rc2 |
1907 |
|
55db4c64e Revert "tty: make... |
1908 |
n_tty_set_room(tty); |
1da177e4c Linux-2.6.12-rc2 |
1909 1910 1911 1912 |
return retval; } /** |
11a96d182 tty: rename the r... |
1913 |
* n_tty_write - write function for tty |
1da177e4c Linux-2.6.12-rc2 |
1914 1915 1916 1917 1918 |
* @tty: tty device * @file: file object * @buf: userspace buffer pointer * @nr: size of I/O * |
a88a69c91 n_tty: Fix loss o... |
1919 |
* Write function of the terminal device. This is serialized with |
1da177e4c Linux-2.6.12-rc2 |
1920 |
* respect to other write callers but not to termios changes, reads |
a88a69c91 n_tty: Fix loss o... |
1921 1922 1923 1924 1925 |
* and other such events. Since the receive code will echo characters, * thus calling driver write methods, the output_lock is used in * the output processing functions called here as well as in the * echo processing function to protect the column state and space * left in the buffer. |
1da177e4c Linux-2.6.12-rc2 |
1926 1927 |
* * This code must be sure never to sleep through a hangup. |
a88a69c91 n_tty: Fix loss o... |
1928 1929 1930 1931 |
* * Locking: output_lock to protect column state and space left * (note that the process_output*() functions take this * lock themselves) |
1da177e4c Linux-2.6.12-rc2 |
1932 |
*/ |
4edf1827e n_tty: clean up o... |
1933 |
|
11a96d182 tty: rename the r... |
1934 |
static ssize_t n_tty_write(struct tty_struct *tty, struct file *file, |
a88a69c91 n_tty: Fix loss o... |
1935 |
const unsigned char *buf, size_t nr) |
1da177e4c Linux-2.6.12-rc2 |
1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 |
{ const unsigned char *b = buf; DECLARE_WAITQUEUE(wait, current); int c; ssize_t retval = 0; /* Job control check -- must be done at start (POSIX.1 7.1.1.4). */ if (L_TOSTOP(tty) && file->f_op->write != redirected_tty_write) { retval = tty_check_change(tty); if (retval) return retval; } |
a88a69c91 n_tty: Fix loss o... |
1948 1949 |
/* Write out any echoed characters that are still pending */ process_echoes(tty); |
300a6204b n_tty: clean up c... |
1950 |
|
1da177e4c Linux-2.6.12-rc2 |
1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 |
add_wait_queue(&tty->write_wait, &wait); while (1) { set_current_state(TASK_INTERRUPTIBLE); if (signal_pending(current)) { retval = -ERESTARTSYS; break; } if (tty_hung_up_p(file) || (tty->link && !tty->link->count)) { retval = -EIO; break; } if (O_OPOST(tty) && !(test_bit(TTY_HW_COOK_OUT, &tty->flags))) { while (nr > 0) { |
a88a69c91 n_tty: Fix loss o... |
1964 |
ssize_t num = process_output_block(tty, b, nr); |
1da177e4c Linux-2.6.12-rc2 |
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 |
if (num < 0) { if (num == -EAGAIN) break; retval = num; goto break_out; } b += num; nr -= num; if (nr == 0) break; c = *b; |
a88a69c91 n_tty: Fix loss o... |
1976 |
if (process_output(c, tty) < 0) |
1da177e4c Linux-2.6.12-rc2 |
1977 1978 1979 |
break; b++; nr--; } |
f34d7a5b7 tty: The big oper... |
1980 1981 |
if (tty->ops->flush_chars) tty->ops->flush_chars(tty); |
1da177e4c Linux-2.6.12-rc2 |
1982 |
} else { |
d6afe27bf [PATCH] tty outpu... |
1983 |
while (nr > 0) { |
f34d7a5b7 tty: The big oper... |
1984 |
c = tty->ops->write(tty, b, nr); |
d6afe27bf [PATCH] tty outpu... |
1985 1986 1987 1988 1989 1990 1991 1992 |
if (c < 0) { retval = c; goto break_out; } if (!c) break; b += c; nr -= c; |
1da177e4c Linux-2.6.12-rc2 |
1993 |
} |
1da177e4c Linux-2.6.12-rc2 |
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 |
} if (!nr) break; if (file->f_flags & O_NONBLOCK) { retval = -EAGAIN; break; } schedule(); } break_out: __set_current_state(TASK_RUNNING); remove_wait_queue(&tty->write_wait, &wait); |
ff8cb0fd6 tty: N_TTY SIGIO ... |
2006 2007 |
if (b - buf != nr && tty->fasync) set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
1da177e4c Linux-2.6.12-rc2 |
2008 2009 2010 2011 |
return (b - buf) ? b - buf : retval; } /** |
11a96d182 tty: rename the r... |
2012 |
* n_tty_poll - poll method for N_TTY |
1da177e4c Linux-2.6.12-rc2 |
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 |
* @tty: terminal device * @file: file accessing it * @wait: poll table * * Called when the line discipline is asked to poll() for data or * for special events. This code is not serialized with respect to * other events save open/close. * * This code must be sure never to sleep through a hangup. * Called without the kernel lock held - fine |
1da177e4c Linux-2.6.12-rc2 |
2023 |
*/ |
4edf1827e n_tty: clean up o... |
2024 |
|
11a96d182 tty: rename the r... |
2025 |
static unsigned int n_tty_poll(struct tty_struct *tty, struct file *file, |
4edf1827e n_tty: clean up o... |
2026 |
poll_table *wait) |
1da177e4c Linux-2.6.12-rc2 |
2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 |
{ unsigned int mask = 0; poll_wait(file, &tty->read_wait, wait); poll_wait(file, &tty->write_wait, wait); if (input_available_p(tty, TIME_CHAR(tty) ? 0 : MIN_CHAR(tty))) mask |= POLLIN | POLLRDNORM; if (tty->packet && tty->link->ctrl_status) mask |= POLLPRI | POLLIN | POLLRDNORM; if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) mask |= POLLHUP; if (tty_hung_up_p(file)) mask |= POLLHUP; if (!(mask & (POLLHUP | POLLIN | POLLRDNORM))) { if (MIN_CHAR(tty) && !TIME_CHAR(tty)) tty->minimum_to_wake = MIN_CHAR(tty); else tty->minimum_to_wake = 1; } |
f34d7a5b7 tty: The big oper... |
2046 2047 2048 |
if (tty->ops->write && !tty_is_writelocked(tty) && tty_chars_in_buffer(tty) < WAKEUP_CHARS && tty_write_room(tty) > 0) |
1da177e4c Linux-2.6.12-rc2 |
2049 2050 2051 |
mask |= POLLOUT | POLLWRNORM; return mask; } |
47afa7a5a tty: some ICANON ... |
2052 2053 2054 |
static unsigned long inq_canon(struct tty_struct *tty) { int nr, head, tail; |
17b820606 tty: Minor tidyup... |
2055 |
if (!tty->canon_data) |
47afa7a5a tty: some ICANON ... |
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 |
return 0; head = tty->canon_head; tail = tty->read_tail; nr = (head - tail) & (N_TTY_BUF_SIZE-1); /* Skip EOF-chars.. */ while (head != tail) { if (test_bit(tail, tty->read_flags) && tty->read_buf[tail] == __DISABLED_CHAR) nr--; tail = (tail+1) & (N_TTY_BUF_SIZE-1); } return nr; } static int n_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { int retval; switch (cmd) { case TIOCOUTQ: return put_user(tty_chars_in_buffer(tty), (int __user *) arg); case TIOCINQ: |
17b820606 tty: Minor tidyup... |
2079 |
/* FIXME: Locking */ |
47afa7a5a tty: some ICANON ... |
2080 2081 2082 2083 2084 2085 2086 2087 |
retval = tty->read_cnt; if (L_ICANON(tty)) retval = inq_canon(tty); return put_user(retval, (unsigned int __user *) arg); default: return n_tty_ioctl_helper(tty, file, cmd, arg); } } |
a352def21 tty: Ldisc revamp |
2088 |
struct tty_ldisc_ops tty_ldisc_N_TTY = { |
e10cc1df1 tty: add compat_i... |
2089 2090 2091 2092 2093 2094 |
.magic = TTY_LDISC_MAGIC, .name = "n_tty", .open = n_tty_open, .close = n_tty_close, .flush_buffer = n_tty_flush_buffer, .chars_in_buffer = n_tty_chars_in_buffer, |
11a96d182 tty: rename the r... |
2095 2096 |
.read = n_tty_read, .write = n_tty_write, |
e10cc1df1 tty: add compat_i... |
2097 2098 |
.ioctl = n_tty_ioctl, .set_termios = n_tty_set_termios, |
11a96d182 tty: rename the r... |
2099 |
.poll = n_tty_poll, |
e10cc1df1 tty: add compat_i... |
2100 2101 |
.receive_buf = n_tty_receive_buf, .write_wakeup = n_tty_write_wakeup |
1da177e4c Linux-2.6.12-rc2 |
2102 |
}; |
572b9adbd ldisc n_tty: add ... |
2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 |
/** * n_tty_inherit_ops - inherit N_TTY methods * @ops: struct tty_ldisc_ops where to save N_TTY methods * * Used by a generic struct tty_ldisc_ops to easily inherit N_TTY * methods. */ void n_tty_inherit_ops(struct tty_ldisc_ops *ops) { *ops = tty_ldisc_N_TTY; ops->owner = NULL; ops->refcount = ops->flags = 0; } EXPORT_SYMBOL_GPL(n_tty_inherit_ops); |