Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/char/vt_ioctl.c | |
3 | * | |
4 | * Copyright (C) 1992 obz under the linux copyright | |
5 | * | |
6 | * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993 | |
7 | * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994 | |
8 | * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995 | |
9 | * Some code moved for less code duplication - Andi Kleen - Mar 1997 | |
10 | * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001 | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/types.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/tty.h> | |
17 | #include <linux/timer.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/kd.h> | |
20 | #include <linux/vt.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/major.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/console.h> | |
04c71976 | 26 | #include <linux/consolemap.h> |
7ed20e1a | 27 | #include <linux/signal.h> |
bcc8ca09 | 28 | #include <linux/timex.h> |
1da177e4 LT |
29 | |
30 | #include <asm/io.h> | |
31 | #include <asm/uaccess.h> | |
32 | ||
33 | #include <linux/kbd_kern.h> | |
34 | #include <linux/vt_kern.h> | |
35 | #include <linux/kbd_diacr.h> | |
36 | #include <linux/selection.h> | |
37 | ||
b257bc05 | 38 | char vt_dont_switch; |
1da177e4 LT |
39 | extern struct tty_driver *console_driver; |
40 | ||
41 | #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count) | |
42 | #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons) | |
43 | ||
44 | /* | |
45 | * Console (vt and kd) routines, as defined by USL SVR4 manual, and by | |
46 | * experimentation and study of X386 SYSV handling. | |
47 | * | |
48 | * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and | |
49 | * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console, | |
50 | * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will | |
51 | * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to | |
52 | * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using | |
53 | * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing | |
54 | * to the current console is done by the main ioctl code. | |
55 | */ | |
56 | ||
57 | #ifdef CONFIG_X86 | |
58 | #include <linux/syscalls.h> | |
59 | #endif | |
60 | ||
61 | static void complete_change_console(struct vc_data *vc); | |
62 | ||
63 | /* | |
64 | * these are the valid i/o ports we're allowed to change. they map all the | |
65 | * video ports | |
66 | */ | |
67 | #define GPFIRST 0x3b4 | |
68 | #define GPLAST 0x3df | |
69 | #define GPNUM (GPLAST - GPFIRST + 1) | |
70 | ||
71 | #define i (tmp.kb_index) | |
72 | #define s (tmp.kb_table) | |
73 | #define v (tmp.kb_value) | |
74 | static inline int | |
75 | do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd) | |
76 | { | |
77 | struct kbentry tmp; | |
78 | ushort *key_map, val, ov; | |
79 | ||
80 | if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry))) | |
81 | return -EFAULT; | |
82 | ||
e3f17f0f MT |
83 | if (!capable(CAP_SYS_TTY_CONFIG)) |
84 | perm = 0; | |
85 | ||
1da177e4 LT |
86 | switch (cmd) { |
87 | case KDGKBENT: | |
88 | key_map = key_maps[s]; | |
89 | if (key_map) { | |
90 | val = U(key_map[i]); | |
91 | if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES) | |
92 | val = K_HOLE; | |
93 | } else | |
94 | val = (i ? K_HOLE : K_NOSUCHMAP); | |
95 | return put_user(val, &user_kbe->kb_value); | |
96 | case KDSKBENT: | |
97 | if (!perm) | |
98 | return -EPERM; | |
99 | if (!i && v == K_NOSUCHMAP) { | |
ca9bda00 | 100 | /* deallocate map */ |
1da177e4 LT |
101 | key_map = key_maps[s]; |
102 | if (s && key_map) { | |
103 | key_maps[s] = NULL; | |
104 | if (key_map[0] == U(K_ALLOCATED)) { | |
105 | kfree(key_map); | |
106 | keymap_count--; | |
107 | } | |
108 | } | |
109 | break; | |
110 | } | |
111 | ||
112 | if (KTYP(v) < NR_TYPES) { | |
113 | if (KVAL(v) > max_vals[KTYP(v)]) | |
114 | return -EINVAL; | |
115 | } else | |
116 | if (kbd->kbdmode != VC_UNICODE) | |
117 | return -EINVAL; | |
118 | ||
119 | /* ++Geert: non-PC keyboards may generate keycode zero */ | |
120 | #if !defined(__mc68000__) && !defined(__powerpc__) | |
121 | /* assignment to entry 0 only tests validity of args */ | |
122 | if (!i) | |
123 | break; | |
124 | #endif | |
125 | ||
126 | if (!(key_map = key_maps[s])) { | |
127 | int j; | |
128 | ||
129 | if (keymap_count >= MAX_NR_OF_USER_KEYMAPS && | |
130 | !capable(CAP_SYS_RESOURCE)) | |
131 | return -EPERM; | |
132 | ||
5cbded58 | 133 | key_map = kmalloc(sizeof(plain_map), |
1da177e4 LT |
134 | GFP_KERNEL); |
135 | if (!key_map) | |
136 | return -ENOMEM; | |
137 | key_maps[s] = key_map; | |
138 | key_map[0] = U(K_ALLOCATED); | |
139 | for (j = 1; j < NR_KEYS; j++) | |
140 | key_map[j] = U(K_HOLE); | |
141 | keymap_count++; | |
142 | } | |
143 | ov = U(key_map[i]); | |
144 | if (v == ov) | |
145 | break; /* nothing to do */ | |
146 | /* | |
147 | * Attention Key. | |
148 | */ | |
149 | if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN)) | |
150 | return -EPERM; | |
151 | key_map[i] = U(v); | |
152 | if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT)) | |
153 | compute_shiftstate(); | |
154 | break; | |
155 | } | |
156 | return 0; | |
157 | } | |
158 | #undef i | |
159 | #undef s | |
160 | #undef v | |
161 | ||
162 | static inline int | |
163 | do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm) | |
164 | { | |
165 | struct kbkeycode tmp; | |
166 | int kc = 0; | |
167 | ||
168 | if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode))) | |
169 | return -EFAULT; | |
170 | switch (cmd) { | |
171 | case KDGETKEYCODE: | |
172 | kc = getkeycode(tmp.scancode); | |
173 | if (kc >= 0) | |
174 | kc = put_user(kc, &user_kbkc->keycode); | |
175 | break; | |
176 | case KDSETKEYCODE: | |
177 | if (!perm) | |
178 | return -EPERM; | |
179 | kc = setkeycode(tmp.scancode, tmp.keycode); | |
180 | break; | |
181 | } | |
182 | return kc; | |
183 | } | |
184 | ||
185 | static inline int | |
186 | do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) | |
187 | { | |
188 | struct kbsentry *kbs; | |
189 | char *p; | |
190 | u_char *q; | |
191 | u_char __user *up; | |
192 | int sz; | |
193 | int delta; | |
194 | char *first_free, *fj, *fnw; | |
195 | int i, j, k; | |
196 | int ret; | |
197 | ||
0b360adb | 198 | if (!capable(CAP_SYS_TTY_CONFIG)) |
e3f17f0f | 199 | perm = 0; |
0b360adb | 200 | |
1da177e4 LT |
201 | kbs = kmalloc(sizeof(*kbs), GFP_KERNEL); |
202 | if (!kbs) { | |
203 | ret = -ENOMEM; | |
204 | goto reterr; | |
205 | } | |
206 | ||
207 | /* we mostly copy too much here (512bytes), but who cares ;) */ | |
208 | if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) { | |
209 | ret = -EFAULT; | |
210 | goto reterr; | |
211 | } | |
212 | kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0'; | |
213 | i = kbs->kb_func; | |
214 | ||
215 | switch (cmd) { | |
216 | case KDGKBSENT: | |
217 | sz = sizeof(kbs->kb_string) - 1; /* sz should have been | |
218 | a struct member */ | |
219 | up = user_kdgkb->kb_string; | |
220 | p = func_table[i]; | |
221 | if(p) | |
222 | for ( ; *p && sz; p++, sz--) | |
223 | if (put_user(*p, up++)) { | |
224 | ret = -EFAULT; | |
225 | goto reterr; | |
226 | } | |
227 | if (put_user('\0', up)) { | |
228 | ret = -EFAULT; | |
229 | goto reterr; | |
230 | } | |
231 | kfree(kbs); | |
232 | return ((p && *p) ? -EOVERFLOW : 0); | |
233 | case KDSKBSENT: | |
234 | if (!perm) { | |
235 | ret = -EPERM; | |
236 | goto reterr; | |
237 | } | |
238 | ||
239 | q = func_table[i]; | |
240 | first_free = funcbufptr + (funcbufsize - funcbufleft); | |
241 | for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) | |
242 | ; | |
243 | if (j < MAX_NR_FUNC) | |
244 | fj = func_table[j]; | |
245 | else | |
246 | fj = first_free; | |
247 | ||
248 | delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string); | |
249 | if (delta <= funcbufleft) { /* it fits in current buf */ | |
250 | if (j < MAX_NR_FUNC) { | |
251 | memmove(fj + delta, fj, first_free - fj); | |
252 | for (k = j; k < MAX_NR_FUNC; k++) | |
253 | if (func_table[k]) | |
254 | func_table[k] += delta; | |
255 | } | |
256 | if (!q) | |
257 | func_table[i] = fj; | |
258 | funcbufleft -= delta; | |
259 | } else { /* allocate a larger buffer */ | |
260 | sz = 256; | |
261 | while (sz < funcbufsize - funcbufleft + delta) | |
262 | sz <<= 1; | |
5cbded58 | 263 | fnw = kmalloc(sz, GFP_KERNEL); |
1da177e4 LT |
264 | if(!fnw) { |
265 | ret = -ENOMEM; | |
266 | goto reterr; | |
267 | } | |
268 | ||
269 | if (!q) | |
270 | func_table[i] = fj; | |
271 | if (fj > funcbufptr) | |
272 | memmove(fnw, funcbufptr, fj - funcbufptr); | |
273 | for (k = 0; k < j; k++) | |
274 | if (func_table[k]) | |
275 | func_table[k] = fnw + (func_table[k] - funcbufptr); | |
276 | ||
277 | if (first_free > fj) { | |
278 | memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj); | |
279 | for (k = j; k < MAX_NR_FUNC; k++) | |
280 | if (func_table[k]) | |
281 | func_table[k] = fnw + (func_table[k] - funcbufptr) + delta; | |
282 | } | |
283 | if (funcbufptr != func_buf) | |
284 | kfree(funcbufptr); | |
285 | funcbufptr = fnw; | |
286 | funcbufleft = funcbufleft - delta + sz - funcbufsize; | |
287 | funcbufsize = sz; | |
288 | } | |
289 | strcpy(func_table[i], kbs->kb_string); | |
290 | break; | |
291 | } | |
292 | ret = 0; | |
293 | reterr: | |
294 | kfree(kbs); | |
295 | return ret; | |
296 | } | |
297 | ||
298 | static inline int | |
299 | do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op) | |
300 | { | |
301 | struct consolefontdesc cfdarg; | |
302 | int i; | |
303 | ||
304 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) | |
305 | return -EFAULT; | |
306 | ||
307 | switch (cmd) { | |
308 | case PIO_FONTX: | |
309 | if (!perm) | |
310 | return -EPERM; | |
311 | op->op = KD_FONT_OP_SET; | |
312 | op->flags = KD_FONT_FLAG_OLD; | |
313 | op->width = 8; | |
314 | op->height = cfdarg.charheight; | |
315 | op->charcount = cfdarg.charcount; | |
316 | op->data = cfdarg.chardata; | |
317 | return con_font_op(vc_cons[fg_console].d, op); | |
318 | case GIO_FONTX: { | |
319 | op->op = KD_FONT_OP_GET; | |
320 | op->flags = KD_FONT_FLAG_OLD; | |
321 | op->width = 8; | |
322 | op->height = cfdarg.charheight; | |
323 | op->charcount = cfdarg.charcount; | |
324 | op->data = cfdarg.chardata; | |
325 | i = con_font_op(vc_cons[fg_console].d, op); | |
326 | if (i) | |
327 | return i; | |
328 | cfdarg.charheight = op->height; | |
329 | cfdarg.charcount = op->charcount; | |
330 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) | |
331 | return -EFAULT; | |
332 | return 0; | |
333 | } | |
334 | } | |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | static inline int | |
339 | do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) | |
340 | { | |
341 | struct unimapdesc tmp; | |
342 | ||
343 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
344 | return -EFAULT; | |
345 | if (tmp.entries) | |
346 | if (!access_ok(VERIFY_WRITE, tmp.entries, | |
347 | tmp.entry_ct*sizeof(struct unipair))) | |
348 | return -EFAULT; | |
349 | switch (cmd) { | |
350 | case PIO_UNIMAP: | |
351 | if (!perm) | |
352 | return -EPERM; | |
353 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); | |
354 | case GIO_UNIMAP: | |
355 | if (!perm && fg_console != vc->vc_num) | |
356 | return -EPERM; | |
357 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries); | |
358 | } | |
359 | return 0; | |
360 | } | |
361 | ||
362 | /* | |
363 | * We handle the console-specific ioctl's here. We allow the | |
364 | * capability to modify any console, not just the fg_console. | |
365 | */ | |
366 | int vt_ioctl(struct tty_struct *tty, struct file * file, | |
367 | unsigned int cmd, unsigned long arg) | |
368 | { | |
369 | struct vc_data *vc = (struct vc_data *)tty->driver_data; | |
370 | struct console_font_op op; /* used in multiple places here */ | |
371 | struct kbd_struct * kbd; | |
372 | unsigned int console; | |
373 | unsigned char ucval; | |
374 | void __user *up = (void __user *)arg; | |
375 | int i, perm; | |
376 | ||
377 | console = vc->vc_num; | |
378 | ||
379 | if (!vc_cons_allocated(console)) /* impossible? */ | |
380 | return -ENOIOCTLCMD; | |
381 | ||
382 | /* | |
383 | * To have permissions to do most of the vt ioctls, we either have | |
384 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
385 | */ | |
386 | perm = 0; | |
387 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
388 | perm = 1; | |
389 | ||
390 | kbd = kbd_table + console; | |
391 | switch (cmd) { | |
392 | case KIOCSOUND: | |
393 | if (!perm) | |
394 | return -EPERM; | |
395 | if (arg) | |
bcc8ca09 | 396 | arg = CLOCK_TICK_RATE / arg; |
1da177e4 LT |
397 | kd_mksound(arg, 0); |
398 | return 0; | |
399 | ||
400 | case KDMKTONE: | |
401 | if (!perm) | |
402 | return -EPERM; | |
403 | { | |
404 | unsigned int ticks, count; | |
405 | ||
406 | /* | |
407 | * Generate the tone for the appropriate number of ticks. | |
408 | * If the time is zero, turn off sound ourselves. | |
409 | */ | |
410 | ticks = HZ * ((arg >> 16) & 0xffff) / 1000; | |
411 | count = ticks ? (arg & 0xffff) : 0; | |
412 | if (count) | |
bcc8ca09 | 413 | count = CLOCK_TICK_RATE / count; |
1da177e4 LT |
414 | kd_mksound(count, ticks); |
415 | return 0; | |
416 | } | |
417 | ||
418 | case KDGKBTYPE: | |
419 | /* | |
420 | * this is naive. | |
421 | */ | |
422 | ucval = KB_101; | |
423 | goto setchar; | |
424 | ||
425 | /* | |
426 | * These cannot be implemented on any machine that implements | |
427 | * ioperm() in user level (such as Alpha PCs) or not at all. | |
428 | * | |
429 | * XXX: you should never use these, just call ioperm directly.. | |
430 | */ | |
431 | #ifdef CONFIG_X86 | |
432 | case KDADDIO: | |
433 | case KDDELIO: | |
434 | /* | |
435 | * KDADDIO and KDDELIO may be able to add ports beyond what | |
436 | * we reject here, but to be safe... | |
437 | */ | |
438 | if (arg < GPFIRST || arg > GPLAST) | |
439 | return -EINVAL; | |
440 | return sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; | |
441 | ||
442 | case KDENABIO: | |
443 | case KDDISABIO: | |
444 | return sys_ioperm(GPFIRST, GPNUM, | |
445 | (cmd == KDENABIO)) ? -ENXIO : 0; | |
446 | #endif | |
447 | ||
448 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ | |
449 | ||
450 | case KDKBDREP: | |
451 | { | |
452 | struct kbd_repeat kbrep; | |
453 | int err; | |
454 | ||
455 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
456 | return -EPERM; | |
457 | ||
458 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) | |
459 | return -EFAULT; | |
460 | err = kbd_rate(&kbrep); | |
461 | if (err) | |
462 | return err; | |
463 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) | |
464 | return -EFAULT; | |
465 | return 0; | |
466 | } | |
467 | ||
468 | case KDSETMODE: | |
469 | /* | |
470 | * currently, setting the mode from KD_TEXT to KD_GRAPHICS | |
471 | * doesn't do a whole lot. i'm not sure if it should do any | |
472 | * restoration of modes or what... | |
473 | * | |
474 | * XXX It should at least call into the driver, fbdev's definitely | |
475 | * need to restore their engine state. --BenH | |
476 | */ | |
477 | if (!perm) | |
478 | return -EPERM; | |
479 | switch (arg) { | |
480 | case KD_GRAPHICS: | |
481 | break; | |
482 | case KD_TEXT0: | |
483 | case KD_TEXT1: | |
484 | arg = KD_TEXT; | |
485 | case KD_TEXT: | |
486 | break; | |
487 | default: | |
488 | return -EINVAL; | |
489 | } | |
490 | if (vc->vc_mode == (unsigned char) arg) | |
491 | return 0; | |
492 | vc->vc_mode = (unsigned char) arg; | |
493 | if (console != fg_console) | |
494 | return 0; | |
495 | /* | |
496 | * explicitly blank/unblank the screen if switching modes | |
497 | */ | |
498 | acquire_console_sem(); | |
499 | if (arg == KD_TEXT) | |
500 | do_unblank_screen(1); | |
501 | else | |
502 | do_blank_screen(1); | |
503 | release_console_sem(); | |
504 | return 0; | |
505 | ||
506 | case KDGETMODE: | |
507 | ucval = vc->vc_mode; | |
508 | goto setint; | |
509 | ||
510 | case KDMAPDISP: | |
511 | case KDUNMAPDISP: | |
512 | /* | |
513 | * these work like a combination of mmap and KDENABIO. | |
514 | * this could be easily finished. | |
515 | */ | |
516 | return -EINVAL; | |
517 | ||
518 | case KDSKBMODE: | |
519 | if (!perm) | |
520 | return -EPERM; | |
521 | switch(arg) { | |
522 | case K_RAW: | |
523 | kbd->kbdmode = VC_RAW; | |
524 | break; | |
525 | case K_MEDIUMRAW: | |
526 | kbd->kbdmode = VC_MEDIUMRAW; | |
527 | break; | |
528 | case K_XLATE: | |
529 | kbd->kbdmode = VC_XLATE; | |
530 | compute_shiftstate(); | |
531 | break; | |
532 | case K_UNICODE: | |
533 | kbd->kbdmode = VC_UNICODE; | |
534 | compute_shiftstate(); | |
535 | break; | |
536 | default: | |
537 | return -EINVAL; | |
538 | } | |
539 | tty_ldisc_flush(tty); | |
540 | return 0; | |
541 | ||
542 | case KDGKBMODE: | |
543 | ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW : | |
544 | (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW : | |
545 | (kbd->kbdmode == VC_UNICODE) ? K_UNICODE : | |
546 | K_XLATE); | |
547 | goto setint; | |
548 | ||
549 | /* this could be folded into KDSKBMODE, but for compatibility | |
550 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ | |
551 | case KDSKBMETA: | |
552 | switch(arg) { | |
553 | case K_METABIT: | |
554 | clr_vc_kbd_mode(kbd, VC_META); | |
555 | break; | |
556 | case K_ESCPREFIX: | |
557 | set_vc_kbd_mode(kbd, VC_META); | |
558 | break; | |
559 | default: | |
560 | return -EINVAL; | |
561 | } | |
562 | return 0; | |
563 | ||
564 | case KDGKBMETA: | |
565 | ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT); | |
566 | setint: | |
567 | return put_user(ucval, (int __user *)arg); | |
568 | ||
569 | case KDGETKEYCODE: | |
570 | case KDSETKEYCODE: | |
571 | if(!capable(CAP_SYS_TTY_CONFIG)) | |
572 | perm=0; | |
573 | return do_kbkeycode_ioctl(cmd, up, perm); | |
574 | ||
575 | case KDGKBENT: | |
576 | case KDSKBENT: | |
577 | return do_kdsk_ioctl(cmd, up, perm, kbd); | |
578 | ||
579 | case KDGKBSENT: | |
580 | case KDSKBSENT: | |
581 | return do_kdgkb_ioctl(cmd, up, perm); | |
582 | ||
583 | case KDGKBDIACR: | |
584 | { | |
585 | struct kbdiacrs __user *a = up; | |
04c71976 ST |
586 | struct kbdiacr diacr; |
587 | int i; | |
1da177e4 LT |
588 | |
589 | if (put_user(accent_table_size, &a->kb_cnt)) | |
590 | return -EFAULT; | |
04c71976 ST |
591 | for (i = 0; i < accent_table_size; i++) { |
592 | diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr); | |
593 | diacr.base = conv_uni_to_8bit(accent_table[i].base); | |
594 | diacr.result = conv_uni_to_8bit(accent_table[i].result); | |
595 | if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) | |
596 | return -EFAULT; | |
597 | } | |
598 | return 0; | |
599 | } | |
600 | case KDGKBDIACRUC: | |
601 | { | |
602 | struct kbdiacrsuc __user *a = up; | |
603 | ||
604 | if (put_user(accent_table_size, &a->kb_cnt)) | |
605 | return -EFAULT; | |
606 | if (copy_to_user(a->kbdiacruc, accent_table, accent_table_size*sizeof(struct kbdiacruc))) | |
1da177e4 LT |
607 | return -EFAULT; |
608 | return 0; | |
609 | } | |
610 | ||
611 | case KDSKBDIACR: | |
612 | { | |
613 | struct kbdiacrs __user *a = up; | |
04c71976 ST |
614 | struct kbdiacr diacr; |
615 | unsigned int ct; | |
616 | int i; | |
617 | ||
618 | if (!perm) | |
619 | return -EPERM; | |
620 | if (get_user(ct,&a->kb_cnt)) | |
621 | return -EFAULT; | |
622 | if (ct >= MAX_DIACR) | |
623 | return -EINVAL; | |
624 | accent_table_size = ct; | |
625 | for (i = 0; i < ct; i++) { | |
626 | if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) | |
627 | return -EFAULT; | |
628 | accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr); | |
629 | accent_table[i].base = conv_8bit_to_uni(diacr.base); | |
630 | accent_table[i].result = conv_8bit_to_uni(diacr.result); | |
631 | } | |
632 | return 0; | |
633 | } | |
634 | ||
635 | case KDSKBDIACRUC: | |
636 | { | |
637 | struct kbdiacrsuc __user *a = up; | |
1da177e4 LT |
638 | unsigned int ct; |
639 | ||
640 | if (!perm) | |
641 | return -EPERM; | |
642 | if (get_user(ct,&a->kb_cnt)) | |
643 | return -EFAULT; | |
644 | if (ct >= MAX_DIACR) | |
645 | return -EINVAL; | |
646 | accent_table_size = ct; | |
04c71976 | 647 | if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc))) |
1da177e4 LT |
648 | return -EFAULT; |
649 | return 0; | |
650 | } | |
651 | ||
652 | /* the ioctls below read/set the flags usually shown in the leds */ | |
653 | /* don't use them - they will go away without warning */ | |
654 | case KDGKBLED: | |
655 | ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4); | |
656 | goto setchar; | |
657 | ||
658 | case KDSKBLED: | |
659 | if (!perm) | |
660 | return -EPERM; | |
661 | if (arg & ~0x77) | |
662 | return -EINVAL; | |
663 | kbd->ledflagstate = (arg & 7); | |
664 | kbd->default_ledflagstate = ((arg >> 4) & 7); | |
665 | set_leds(); | |
666 | return 0; | |
667 | ||
668 | /* the ioctls below only set the lights, not the functions */ | |
669 | /* for those, see KDGKBLED and KDSKBLED above */ | |
670 | case KDGETLED: | |
671 | ucval = getledstate(); | |
672 | setchar: | |
673 | return put_user(ucval, (char __user *)arg); | |
674 | ||
675 | case KDSETLED: | |
676 | if (!perm) | |
677 | return -EPERM; | |
678 | setledstate(kbd, arg); | |
679 | return 0; | |
680 | ||
681 | /* | |
682 | * A process can indicate its willingness to accept signals | |
683 | * generated by pressing an appropriate key combination. | |
684 | * Thus, one can have a daemon that e.g. spawns a new console | |
685 | * upon a keypress and then changes to it. | |
686 | * See also the kbrequest field of inittab(5). | |
687 | */ | |
688 | case KDSIGACCEPT: | |
689 | { | |
1da177e4 LT |
690 | if (!perm || !capable(CAP_KILL)) |
691 | return -EPERM; | |
7ed20e1a | 692 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
1da177e4 | 693 | return -EINVAL; |
81af8d67 EB |
694 | |
695 | spin_lock_irq(&vt_spawn_con.lock); | |
696 | put_pid(vt_spawn_con.pid); | |
697 | vt_spawn_con.pid = get_pid(task_pid(current)); | |
698 | vt_spawn_con.sig = arg; | |
699 | spin_unlock_irq(&vt_spawn_con.lock); | |
1da177e4 LT |
700 | return 0; |
701 | } | |
702 | ||
703 | case VT_SETMODE: | |
704 | { | |
705 | struct vt_mode tmp; | |
706 | ||
707 | if (!perm) | |
708 | return -EPERM; | |
709 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) | |
710 | return -EFAULT; | |
711 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) | |
712 | return -EINVAL; | |
713 | acquire_console_sem(); | |
714 | vc->vt_mode = tmp; | |
715 | /* the frsig is ignored, so we set it to 0 */ | |
716 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
717 | put_pid(vc->vt_pid); |
718 | vc->vt_pid = get_pid(task_pid(current)); | |
1da177e4 LT |
719 | /* no switch is required -- saw@shade.msu.ru */ |
720 | vc->vt_newvt = -1; | |
721 | release_console_sem(); | |
722 | return 0; | |
723 | } | |
724 | ||
725 | case VT_GETMODE: | |
726 | { | |
727 | struct vt_mode tmp; | |
728 | int rc; | |
729 | ||
730 | acquire_console_sem(); | |
731 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); | |
732 | release_console_sem(); | |
733 | ||
734 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); | |
735 | return rc ? -EFAULT : 0; | |
736 | } | |
737 | ||
738 | /* | |
739 | * Returns global vt state. Note that VT 0 is always open, since | |
740 | * it's an alias for the current VT, and people can't use it here. | |
741 | * We cannot return state for more than 16 VTs, since v_state is short. | |
742 | */ | |
743 | case VT_GETSTATE: | |
744 | { | |
745 | struct vt_stat __user *vtstat = up; | |
746 | unsigned short state, mask; | |
747 | ||
748 | if (put_user(fg_console + 1, &vtstat->v_active)) | |
749 | return -EFAULT; | |
750 | state = 1; /* /dev/tty0 is always open */ | |
751 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; ++i, mask <<= 1) | |
752 | if (VT_IS_IN_USE(i)) | |
753 | state |= mask; | |
754 | return put_user(state, &vtstat->v_state); | |
755 | } | |
756 | ||
757 | /* | |
758 | * Returns the first available (non-opened) console. | |
759 | */ | |
760 | case VT_OPENQRY: | |
761 | for (i = 0; i < MAX_NR_CONSOLES; ++i) | |
762 | if (! VT_IS_IN_USE(i)) | |
763 | break; | |
764 | ucval = i < MAX_NR_CONSOLES ? (i+1) : -1; | |
765 | goto setint; | |
766 | ||
767 | /* | |
768 | * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, | |
769 | * with num >= 1 (switches to vt 0, our console, are not allowed, just | |
770 | * to preserve sanity). | |
771 | */ | |
772 | case VT_ACTIVATE: | |
773 | if (!perm) | |
774 | return -EPERM; | |
775 | if (arg == 0 || arg > MAX_NR_CONSOLES) | |
776 | return -ENXIO; | |
777 | arg--; | |
778 | acquire_console_sem(); | |
779 | i = vc_allocate(arg); | |
780 | release_console_sem(); | |
781 | if (i) | |
782 | return i; | |
783 | set_console(arg); | |
784 | return 0; | |
785 | ||
786 | /* | |
787 | * wait until the specified VT has been activated | |
788 | */ | |
789 | case VT_WAITACTIVE: | |
790 | if (!perm) | |
791 | return -EPERM; | |
792 | if (arg == 0 || arg > MAX_NR_CONSOLES) | |
793 | return -ENXIO; | |
794 | return vt_waitactive(arg-1); | |
795 | ||
796 | /* | |
797 | * If a vt is under process control, the kernel will not switch to it | |
798 | * immediately, but postpone the operation until the process calls this | |
799 | * ioctl, allowing the switch to complete. | |
800 | * | |
801 | * According to the X sources this is the behavior: | |
802 | * 0: pending switch-from not OK | |
803 | * 1: pending switch-from OK | |
804 | * 2: completed switch-to OK | |
805 | */ | |
806 | case VT_RELDISP: | |
807 | if (!perm) | |
808 | return -EPERM; | |
809 | if (vc->vt_mode.mode != VT_PROCESS) | |
810 | return -EINVAL; | |
811 | ||
812 | /* | |
813 | * Switching-from response | |
814 | */ | |
8792f961 | 815 | acquire_console_sem(); |
1da177e4 LT |
816 | if (vc->vt_newvt >= 0) { |
817 | if (arg == 0) | |
818 | /* | |
819 | * Switch disallowed, so forget we were trying | |
820 | * to do it. | |
821 | */ | |
822 | vc->vt_newvt = -1; | |
823 | ||
824 | else { | |
825 | /* | |
826 | * The current vt has been released, so | |
827 | * complete the switch. | |
828 | */ | |
829 | int newvt; | |
1da177e4 LT |
830 | newvt = vc->vt_newvt; |
831 | vc->vt_newvt = -1; | |
832 | i = vc_allocate(newvt); | |
833 | if (i) { | |
834 | release_console_sem(); | |
835 | return i; | |
836 | } | |
837 | /* | |
838 | * When we actually do the console switch, | |
839 | * make sure we are atomic with respect to | |
840 | * other console switches.. | |
841 | */ | |
842 | complete_change_console(vc_cons[newvt].d); | |
1da177e4 LT |
843 | } |
844 | } | |
845 | ||
846 | /* | |
847 | * Switched-to response | |
848 | */ | |
849 | else | |
850 | { | |
851 | /* | |
852 | * If it's just an ACK, ignore it | |
853 | */ | |
8792f961 SO |
854 | if (arg != VT_ACKACQ) { |
855 | release_console_sem(); | |
1da177e4 | 856 | return -EINVAL; |
8792f961 | 857 | } |
1da177e4 | 858 | } |
8792f961 | 859 | release_console_sem(); |
1da177e4 LT |
860 | |
861 | return 0; | |
862 | ||
863 | /* | |
864 | * Disallocate memory associated to VT (but leave VT1) | |
865 | */ | |
866 | case VT_DISALLOCATE: | |
867 | if (arg > MAX_NR_CONSOLES) | |
868 | return -ENXIO; | |
869 | if (arg == 0) { | |
ca9bda00 | 870 | /* deallocate all unused consoles, but leave 0 */ |
1da177e4 LT |
871 | acquire_console_sem(); |
872 | for (i=1; i<MAX_NR_CONSOLES; i++) | |
873 | if (! VT_BUSY(i)) | |
ca9bda00 | 874 | vc_deallocate(i); |
1da177e4 LT |
875 | release_console_sem(); |
876 | } else { | |
ca9bda00 | 877 | /* deallocate a single console, if possible */ |
1da177e4 LT |
878 | arg--; |
879 | if (VT_BUSY(arg)) | |
880 | return -EBUSY; | |
881 | if (arg) { /* leave 0 */ | |
882 | acquire_console_sem(); | |
ca9bda00 | 883 | vc_deallocate(arg); |
1da177e4 LT |
884 | release_console_sem(); |
885 | } | |
886 | } | |
887 | return 0; | |
888 | ||
889 | case VT_RESIZE: | |
890 | { | |
891 | struct vt_sizes __user *vtsizes = up; | |
e400b6ec AD |
892 | struct vc_data *vc; |
893 | ||
1da177e4 LT |
894 | ushort ll,cc; |
895 | if (!perm) | |
896 | return -EPERM; | |
897 | if (get_user(ll, &vtsizes->v_rows) || | |
898 | get_user(cc, &vtsizes->v_cols)) | |
899 | return -EFAULT; | |
e400b6ec AD |
900 | |
901 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
902 | vc = vc_cons[i].d; | |
903 | ||
904 | if (vc) { | |
905 | vc->vc_resize_user = 1; | |
906 | vc_lock_resize(vc_cons[i].d, cc, ll); | |
907 | } | |
908 | } | |
909 | ||
1da177e4 LT |
910 | return 0; |
911 | } | |
912 | ||
913 | case VT_RESIZEX: | |
914 | { | |
915 | struct vt_consize __user *vtconsize = up; | |
916 | ushort ll,cc,vlin,clin,vcol,ccol; | |
917 | if (!perm) | |
918 | return -EPERM; | |
919 | if (!access_ok(VERIFY_READ, vtconsize, | |
920 | sizeof(struct vt_consize))) | |
921 | return -EFAULT; | |
922 | __get_user(ll, &vtconsize->v_rows); | |
923 | __get_user(cc, &vtconsize->v_cols); | |
924 | __get_user(vlin, &vtconsize->v_vlin); | |
925 | __get_user(clin, &vtconsize->v_clin); | |
926 | __get_user(vcol, &vtconsize->v_vcol); | |
927 | __get_user(ccol, &vtconsize->v_ccol); | |
928 | vlin = vlin ? vlin : vc->vc_scan_lines; | |
929 | if (clin) { | |
930 | if (ll) { | |
931 | if (ll != vlin/clin) | |
932 | return -EINVAL; /* Parameters don't add up */ | |
933 | } else | |
934 | ll = vlin/clin; | |
935 | } | |
936 | if (vcol && ccol) { | |
937 | if (cc) { | |
938 | if (cc != vcol/ccol) | |
939 | return -EINVAL; | |
940 | } else | |
941 | cc = vcol/ccol; | |
942 | } | |
943 | ||
944 | if (clin > 32) | |
945 | return -EINVAL; | |
946 | ||
947 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
948 | if (!vc_cons[i].d) | |
949 | continue; | |
950 | acquire_console_sem(); | |
951 | if (vlin) | |
952 | vc_cons[i].d->vc_scan_lines = vlin; | |
953 | if (clin) | |
954 | vc_cons[i].d->vc_font.height = clin; | |
e400b6ec | 955 | vc_cons[i].d->vc_resize_user = 1; |
1da177e4 LT |
956 | vc_resize(vc_cons[i].d, cc, ll); |
957 | release_console_sem(); | |
958 | } | |
959 | return 0; | |
960 | } | |
961 | ||
962 | case PIO_FONT: { | |
963 | if (!perm) | |
964 | return -EPERM; | |
965 | op.op = KD_FONT_OP_SET; | |
966 | op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ | |
967 | op.width = 8; | |
968 | op.height = 0; | |
969 | op.charcount = 256; | |
970 | op.data = up; | |
971 | return con_font_op(vc_cons[fg_console].d, &op); | |
972 | } | |
973 | ||
974 | case GIO_FONT: { | |
975 | op.op = KD_FONT_OP_GET; | |
976 | op.flags = KD_FONT_FLAG_OLD; | |
977 | op.width = 8; | |
978 | op.height = 32; | |
979 | op.charcount = 256; | |
980 | op.data = up; | |
981 | return con_font_op(vc_cons[fg_console].d, &op); | |
982 | } | |
983 | ||
984 | case PIO_CMAP: | |
985 | if (!perm) | |
986 | return -EPERM; | |
987 | return con_set_cmap(up); | |
988 | ||
989 | case GIO_CMAP: | |
990 | return con_get_cmap(up); | |
991 | ||
992 | case PIO_FONTX: | |
993 | case GIO_FONTX: | |
994 | return do_fontx_ioctl(cmd, up, perm, &op); | |
995 | ||
996 | case PIO_FONTRESET: | |
997 | { | |
998 | if (!perm) | |
999 | return -EPERM; | |
1000 | ||
1001 | #ifdef BROKEN_GRAPHICS_PROGRAMS | |
1002 | /* With BROKEN_GRAPHICS_PROGRAMS defined, the default | |
1003 | font is not saved. */ | |
1004 | return -ENOSYS; | |
1005 | #else | |
1006 | { | |
1007 | op.op = KD_FONT_OP_SET_DEFAULT; | |
1008 | op.data = NULL; | |
1009 | i = con_font_op(vc_cons[fg_console].d, &op); | |
1010 | if (i) | |
1011 | return i; | |
1012 | con_set_default_unimap(vc_cons[fg_console].d); | |
1013 | return 0; | |
1014 | } | |
1015 | #endif | |
1016 | } | |
1017 | ||
1018 | case KDFONTOP: { | |
1019 | if (copy_from_user(&op, up, sizeof(op))) | |
1020 | return -EFAULT; | |
1021 | if (!perm && op.op != KD_FONT_OP_GET) | |
1022 | return -EPERM; | |
1023 | i = con_font_op(vc, &op); | |
1024 | if (i) return i; | |
1025 | if (copy_to_user(up, &op, sizeof(op))) | |
1026 | return -EFAULT; | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | case PIO_SCRNMAP: | |
1031 | if (!perm) | |
1032 | return -EPERM; | |
1033 | return con_set_trans_old(up); | |
1034 | ||
1035 | case GIO_SCRNMAP: | |
1036 | return con_get_trans_old(up); | |
1037 | ||
1038 | case PIO_UNISCRNMAP: | |
1039 | if (!perm) | |
1040 | return -EPERM; | |
1041 | return con_set_trans_new(up); | |
1042 | ||
1043 | case GIO_UNISCRNMAP: | |
1044 | return con_get_trans_new(up); | |
1045 | ||
1046 | case PIO_UNIMAPCLR: | |
1047 | { struct unimapinit ui; | |
1048 | if (!perm) | |
1049 | return -EPERM; | |
1050 | i = copy_from_user(&ui, up, sizeof(struct unimapinit)); | |
1051 | if (i) return -EFAULT; | |
1052 | con_clear_unimap(vc, &ui); | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | case PIO_UNIMAP: | |
1057 | case GIO_UNIMAP: | |
1058 | return do_unimap_ioctl(cmd, up, perm, vc); | |
1059 | ||
1060 | case VT_LOCKSWITCH: | |
1061 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
1062 | return -EPERM; | |
1063 | vt_dont_switch = 1; | |
1064 | return 0; | |
1065 | case VT_UNLOCKSWITCH: | |
1066 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
1067 | return -EPERM; | |
1068 | vt_dont_switch = 0; | |
1069 | return 0; | |
533475d3 ST |
1070 | case VT_GETHIFONTMASK: |
1071 | return put_user(vc->vc_hi_font_mask, (unsigned short __user *)arg); | |
1da177e4 LT |
1072 | default: |
1073 | return -ENOIOCTLCMD; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Sometimes we want to wait until a particular VT has been activated. We | |
1079 | * do it in a very simple manner. Everybody waits on a single queue and | |
1080 | * get woken up at once. Those that are satisfied go on with their business, | |
1081 | * while those not ready go back to sleep. Seems overkill to add a wait | |
1082 | * to each vt just for this - usually this does nothing! | |
1083 | */ | |
1084 | static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue); | |
1085 | ||
1086 | /* | |
1087 | * Sleeps until a vt is activated, or the task is interrupted. Returns | |
70cb9793 | 1088 | * 0 if activation, -EINTR if interrupted by a signal handler. |
1da177e4 LT |
1089 | */ |
1090 | int vt_waitactive(int vt) | |
1091 | { | |
1092 | int retval; | |
1093 | DECLARE_WAITQUEUE(wait, current); | |
1094 | ||
1095 | add_wait_queue(&vt_activate_queue, &wait); | |
1096 | for (;;) { | |
1da177e4 | 1097 | retval = 0; |
f991519c MJ |
1098 | |
1099 | /* | |
1100 | * Synchronize with redraw_screen(). By acquiring the console | |
1101 | * semaphore we make sure that the console switch is completed | |
1102 | * before we return. If we didn't wait for the semaphore, we | |
1103 | * could return at a point where fg_console has already been | |
1104 | * updated, but the console switch hasn't been completed. | |
1105 | */ | |
1106 | acquire_console_sem(); | |
1107 | set_current_state(TASK_INTERRUPTIBLE); | |
1108 | if (vt == fg_console) { | |
1109 | release_console_sem(); | |
1da177e4 | 1110 | break; |
f991519c MJ |
1111 | } |
1112 | release_console_sem(); | |
70cb9793 | 1113 | retval = -ERESTARTNOHAND; |
1da177e4 LT |
1114 | if (signal_pending(current)) |
1115 | break; | |
1116 | schedule(); | |
1117 | } | |
1118 | remove_wait_queue(&vt_activate_queue, &wait); | |
cc0a8fbb | 1119 | __set_current_state(TASK_RUNNING); |
1da177e4 LT |
1120 | return retval; |
1121 | } | |
1122 | ||
1123 | #define vt_wake_waitactive() wake_up(&vt_activate_queue) | |
1124 | ||
1125 | void reset_vc(struct vc_data *vc) | |
1126 | { | |
1127 | vc->vc_mode = KD_TEXT; | |
2e8ecb9d | 1128 | kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE; |
1da177e4 LT |
1129 | vc->vt_mode.mode = VT_AUTO; |
1130 | vc->vt_mode.waitv = 0; | |
1131 | vc->vt_mode.relsig = 0; | |
1132 | vc->vt_mode.acqsig = 0; | |
1133 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
1134 | put_pid(vc->vt_pid); |
1135 | vc->vt_pid = NULL; | |
1da177e4 LT |
1136 | vc->vt_newvt = -1; |
1137 | if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ | |
1138 | reset_palette(vc); | |
1139 | } | |
1140 | ||
8b6312f4 EB |
1141 | void vc_SAK(struct work_struct *work) |
1142 | { | |
1143 | struct vc *vc_con = | |
1144 | container_of(work, struct vc, SAK_work); | |
1145 | struct vc_data *vc; | |
1146 | struct tty_struct *tty; | |
1147 | ||
1148 | acquire_console_sem(); | |
1149 | vc = vc_con->d; | |
1150 | if (vc) { | |
1151 | tty = vc->vc_tty; | |
1152 | /* | |
1153 | * SAK should also work in all raw modes and reset | |
1154 | * them properly. | |
1155 | */ | |
1156 | if (tty) | |
1157 | __do_SAK(tty); | |
1158 | reset_vc(vc); | |
1159 | } | |
1160 | release_console_sem(); | |
1161 | } | |
1162 | ||
1da177e4 LT |
1163 | /* |
1164 | * Performs the back end of a vt switch | |
1165 | */ | |
1166 | static void complete_change_console(struct vc_data *vc) | |
1167 | { | |
1168 | unsigned char old_vc_mode; | |
1169 | ||
1170 | last_console = fg_console; | |
1171 | ||
1172 | /* | |
1173 | * If we're switching, we could be going from KD_GRAPHICS to | |
1174 | * KD_TEXT mode or vice versa, which means we need to blank or | |
1175 | * unblank the screen later. | |
1176 | */ | |
1177 | old_vc_mode = vc_cons[fg_console].d->vc_mode; | |
1178 | switch_screen(vc); | |
1179 | ||
1180 | /* | |
3dfcaf16 | 1181 | * This can't appear below a successful kill_pid(). If it did, |
1da177e4 LT |
1182 | * then the *blank_screen operation could occur while X, having |
1183 | * received acqsig, is waking up on another processor. This | |
1184 | * condition can lead to overlapping accesses to the VGA range | |
1185 | * and the framebuffer (causing system lockups). | |
1186 | * | |
1187 | * To account for this we duplicate this code below only if the | |
1188 | * controlling process is gone and we've called reset_vc. | |
1189 | */ | |
1190 | if (old_vc_mode != vc->vc_mode) { | |
1191 | if (vc->vc_mode == KD_TEXT) | |
1192 | do_unblank_screen(1); | |
1193 | else | |
1194 | do_blank_screen(1); | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * If this new console is under process control, send it a signal | |
1199 | * telling it that it has acquired. Also check if it has died and | |
1200 | * clean up (similar to logic employed in change_console()) | |
1201 | */ | |
1202 | if (vc->vt_mode.mode == VT_PROCESS) { | |
1203 | /* | |
3dfcaf16 | 1204 | * Send the signal as privileged - kill_pid() will |
1da177e4 LT |
1205 | * tell us if the process has gone or something else |
1206 | * is awry | |
1207 | */ | |
bde0d2c9 | 1208 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
1da177e4 LT |
1209 | /* |
1210 | * The controlling process has died, so we revert back to | |
1211 | * normal operation. In this case, we'll also change back | |
1212 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1213 | * but it saves the agony when the X server dies and the screen | |
1214 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1215 | * this outside of VT_PROCESS but there is no single process | |
1216 | * to account for and tracking tty count may be undesirable. | |
1217 | */ | |
1218 | reset_vc(vc); | |
1219 | ||
1220 | if (old_vc_mode != vc->vc_mode) { | |
1221 | if (vc->vc_mode == KD_TEXT) | |
1222 | do_unblank_screen(1); | |
1223 | else | |
1224 | do_blank_screen(1); | |
1225 | } | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | /* | |
1230 | * Wake anyone waiting for their VT to activate | |
1231 | */ | |
1232 | vt_wake_waitactive(); | |
1233 | return; | |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * Performs the front-end of a vt switch | |
1238 | */ | |
1239 | void change_console(struct vc_data *new_vc) | |
1240 | { | |
1241 | struct vc_data *vc; | |
1242 | ||
1243 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) | |
1244 | return; | |
1245 | ||
1246 | /* | |
1247 | * If this vt is in process mode, then we need to handshake with | |
1248 | * that process before switching. Essentially, we store where that | |
1249 | * vt wants to switch to and wait for it to tell us when it's done | |
1250 | * (via VT_RELDISP ioctl). | |
1251 | * | |
1252 | * We also check to see if the controlling process still exists. | |
1253 | * If it doesn't, we reset this vt to auto mode and continue. | |
1254 | * This is a cheap way to track process control. The worst thing | |
1255 | * that can happen is: we send a signal to a process, it dies, and | |
1256 | * the switch gets "lost" waiting for a response; hopefully, the | |
1257 | * user will try again, we'll detect the process is gone (unless | |
1258 | * the user waits just the right amount of time :-) and revert the | |
1259 | * vt to auto control. | |
1260 | */ | |
1261 | vc = vc_cons[fg_console].d; | |
1262 | if (vc->vt_mode.mode == VT_PROCESS) { | |
1263 | /* | |
3dfcaf16 | 1264 | * Send the signal as privileged - kill_pid() will |
1da177e4 | 1265 | * tell us if the process has gone or something else |
a64314e6 JL |
1266 | * is awry. |
1267 | * | |
1268 | * We need to set vt_newvt *before* sending the signal or we | |
1269 | * have a race. | |
1da177e4 | 1270 | */ |
a64314e6 | 1271 | vc->vt_newvt = new_vc->vc_num; |
bde0d2c9 | 1272 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
1da177e4 LT |
1273 | /* |
1274 | * It worked. Mark the vt to switch to and | |
1275 | * return. The process needs to send us a | |
1276 | * VT_RELDISP ioctl to complete the switch. | |
1277 | */ | |
1da177e4 LT |
1278 | return; |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * The controlling process has died, so we revert back to | |
1283 | * normal operation. In this case, we'll also change back | |
1284 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1285 | * but it saves the agony when the X server dies and the screen | |
1286 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1287 | * this outside of VT_PROCESS but there is no single process | |
1288 | * to account for and tracking tty count may be undesirable. | |
1289 | */ | |
1290 | reset_vc(vc); | |
1291 | ||
1292 | /* | |
1293 | * Fall through to normal (VT_AUTO) handling of the switch... | |
1294 | */ | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode | |
1299 | */ | |
1300 | if (vc->vc_mode == KD_GRAPHICS) | |
1301 | return; | |
1302 | ||
1303 | complete_change_console(new_vc); | |
1304 | } |