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