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> | |
e9216651 | 19 | #include <linux/compat.h> |
8d233558 | 20 | #include <linux/module.h> |
1da177e4 LT |
21 | #include <linux/kd.h> |
22 | #include <linux/vt.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/major.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/console.h> | |
04c71976 | 28 | #include <linux/consolemap.h> |
7ed20e1a | 29 | #include <linux/signal.h> |
405f5571 | 30 | #include <linux/smp_lock.h> |
bcc8ca09 | 31 | #include <linux/timex.h> |
1da177e4 LT |
32 | |
33 | #include <asm/io.h> | |
34 | #include <asm/uaccess.h> | |
35 | ||
36 | #include <linux/kbd_kern.h> | |
37 | #include <linux/vt_kern.h> | |
38 | #include <linux/kbd_diacr.h> | |
39 | #include <linux/selection.h> | |
40 | ||
b257bc05 | 41 | char vt_dont_switch; |
1da177e4 LT |
42 | extern struct tty_driver *console_driver; |
43 | ||
44 | #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count) | |
45 | #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons) | |
46 | ||
47 | /* | |
48 | * Console (vt and kd) routines, as defined by USL SVR4 manual, and by | |
49 | * experimentation and study of X386 SYSV handling. | |
50 | * | |
51 | * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and | |
52 | * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console, | |
53 | * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will | |
54 | * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to | |
55 | * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using | |
56 | * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing | |
57 | * to the current console is done by the main ioctl code. | |
58 | */ | |
59 | ||
60 | #ifdef CONFIG_X86 | |
61 | #include <linux/syscalls.h> | |
62 | #endif | |
63 | ||
64 | static void complete_change_console(struct vc_data *vc); | |
65 | ||
8b92e87d AC |
66 | /* |
67 | * User space VT_EVENT handlers | |
68 | */ | |
69 | ||
70 | struct vt_event_wait { | |
71 | struct list_head list; | |
72 | struct vt_event event; | |
73 | int done; | |
74 | }; | |
75 | ||
76 | static LIST_HEAD(vt_events); | |
77 | static DEFINE_SPINLOCK(vt_event_lock); | |
78 | static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue); | |
79 | ||
80 | /** | |
81 | * vt_event_post | |
82 | * @event: the event that occurred | |
83 | * @old: old console | |
84 | * @new: new console | |
85 | * | |
86 | * Post an VT event to interested VT handlers | |
87 | */ | |
88 | ||
89 | void vt_event_post(unsigned int event, unsigned int old, unsigned int new) | |
90 | { | |
91 | struct list_head *pos, *head; | |
92 | unsigned long flags; | |
93 | int wake = 0; | |
94 | ||
95 | spin_lock_irqsave(&vt_event_lock, flags); | |
96 | head = &vt_events; | |
97 | ||
98 | list_for_each(pos, head) { | |
99 | struct vt_event_wait *ve = list_entry(pos, | |
100 | struct vt_event_wait, list); | |
101 | if (!(ve->event.event & event)) | |
102 | continue; | |
103 | ve->event.event = event; | |
104 | /* kernel view is consoles 0..n-1, user space view is | |
105 | console 1..n with 0 meaning current, so we must bias */ | |
308efab5 AC |
106 | ve->event.oldev = old + 1; |
107 | ve->event.newev = new + 1; | |
8b92e87d AC |
108 | wake = 1; |
109 | ve->done = 1; | |
110 | } | |
111 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
112 | if (wake) | |
113 | wake_up_interruptible(&vt_event_waitqueue); | |
114 | } | |
115 | ||
116 | /** | |
117 | * vt_event_wait - wait for an event | |
118 | * @vw: our event | |
119 | * | |
120 | * Waits for an event to occur which completes our vt_event_wait | |
121 | * structure. On return the structure has wv->done set to 1 for success | |
122 | * or 0 if some event such as a signal ended the wait. | |
123 | */ | |
124 | ||
125 | static void vt_event_wait(struct vt_event_wait *vw) | |
126 | { | |
127 | unsigned long flags; | |
128 | /* Prepare the event */ | |
129 | INIT_LIST_HEAD(&vw->list); | |
130 | vw->done = 0; | |
131 | /* Queue our event */ | |
132 | spin_lock_irqsave(&vt_event_lock, flags); | |
133 | list_add(&vw->list, &vt_events); | |
134 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
135 | /* Wait for it to pass */ | |
be1bc288 | 136 | wait_event_interruptible_tty(vt_event_waitqueue, vw->done); |
8b92e87d AC |
137 | /* Dequeue it */ |
138 | spin_lock_irqsave(&vt_event_lock, flags); | |
139 | list_del(&vw->list); | |
140 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
141 | } | |
142 | ||
143 | /** | |
144 | * vt_event_wait_ioctl - event ioctl handler | |
145 | * @arg: argument to ioctl | |
146 | * | |
147 | * Implement the VT_WAITEVENT ioctl using the VT event interface | |
148 | */ | |
149 | ||
150 | static int vt_event_wait_ioctl(struct vt_event __user *event) | |
151 | { | |
152 | struct vt_event_wait vw; | |
153 | ||
154 | if (copy_from_user(&vw.event, event, sizeof(struct vt_event))) | |
155 | return -EFAULT; | |
156 | /* Highest supported event for now */ | |
157 | if (vw.event.event & ~VT_MAX_EVENT) | |
158 | return -EINVAL; | |
159 | ||
160 | vt_event_wait(&vw); | |
161 | /* If it occurred report it */ | |
162 | if (vw.done) { | |
163 | if (copy_to_user(event, &vw.event, sizeof(struct vt_event))) | |
164 | return -EFAULT; | |
165 | return 0; | |
166 | } | |
167 | return -EINTR; | |
168 | } | |
169 | ||
170 | /** | |
171 | * vt_waitactive - active console wait | |
172 | * @event: event code | |
173 | * @n: new console | |
174 | * | |
175 | * Helper for event waits. Used to implement the legacy | |
176 | * event waiting ioctls in terms of events | |
177 | */ | |
178 | ||
179 | int vt_waitactive(int n) | |
180 | { | |
181 | struct vt_event_wait vw; | |
182 | do { | |
183 | if (n == fg_console + 1) | |
184 | break; | |
185 | vw.event.event = VT_EVENT_SWITCH; | |
186 | vt_event_wait(&vw); | |
187 | if (vw.done == 0) | |
188 | return -EINTR; | |
308efab5 | 189 | } while (vw.event.newev != n); |
8b92e87d AC |
190 | return 0; |
191 | } | |
192 | ||
1da177e4 LT |
193 | /* |
194 | * these are the valid i/o ports we're allowed to change. they map all the | |
195 | * video ports | |
196 | */ | |
197 | #define GPFIRST 0x3b4 | |
198 | #define GPLAST 0x3df | |
199 | #define GPNUM (GPLAST - GPFIRST + 1) | |
200 | ||
201 | #define i (tmp.kb_index) | |
202 | #define s (tmp.kb_table) | |
203 | #define v (tmp.kb_value) | |
204 | static inline int | |
205 | do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd) | |
206 | { | |
207 | struct kbentry tmp; | |
208 | ushort *key_map, val, ov; | |
209 | ||
210 | if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry))) | |
211 | return -EFAULT; | |
212 | ||
e3f17f0f MT |
213 | if (!capable(CAP_SYS_TTY_CONFIG)) |
214 | perm = 0; | |
215 | ||
1da177e4 LT |
216 | switch (cmd) { |
217 | case KDGKBENT: | |
218 | key_map = key_maps[s]; | |
219 | if (key_map) { | |
220 | val = U(key_map[i]); | |
221 | if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES) | |
222 | val = K_HOLE; | |
223 | } else | |
224 | val = (i ? K_HOLE : K_NOSUCHMAP); | |
225 | return put_user(val, &user_kbe->kb_value); | |
226 | case KDSKBENT: | |
227 | if (!perm) | |
228 | return -EPERM; | |
229 | if (!i && v == K_NOSUCHMAP) { | |
ca9bda00 | 230 | /* deallocate map */ |
1da177e4 LT |
231 | key_map = key_maps[s]; |
232 | if (s && key_map) { | |
233 | key_maps[s] = NULL; | |
234 | if (key_map[0] == U(K_ALLOCATED)) { | |
235 | kfree(key_map); | |
236 | keymap_count--; | |
237 | } | |
238 | } | |
239 | break; | |
240 | } | |
241 | ||
242 | if (KTYP(v) < NR_TYPES) { | |
243 | if (KVAL(v) > max_vals[KTYP(v)]) | |
244 | return -EINVAL; | |
245 | } else | |
246 | if (kbd->kbdmode != VC_UNICODE) | |
247 | return -EINVAL; | |
248 | ||
249 | /* ++Geert: non-PC keyboards may generate keycode zero */ | |
250 | #if !defined(__mc68000__) && !defined(__powerpc__) | |
251 | /* assignment to entry 0 only tests validity of args */ | |
252 | if (!i) | |
253 | break; | |
254 | #endif | |
255 | ||
256 | if (!(key_map = key_maps[s])) { | |
257 | int j; | |
258 | ||
259 | if (keymap_count >= MAX_NR_OF_USER_KEYMAPS && | |
260 | !capable(CAP_SYS_RESOURCE)) | |
261 | return -EPERM; | |
262 | ||
5cbded58 | 263 | key_map = kmalloc(sizeof(plain_map), |
1da177e4 LT |
264 | GFP_KERNEL); |
265 | if (!key_map) | |
266 | return -ENOMEM; | |
267 | key_maps[s] = key_map; | |
268 | key_map[0] = U(K_ALLOCATED); | |
269 | for (j = 1; j < NR_KEYS; j++) | |
270 | key_map[j] = U(K_HOLE); | |
271 | keymap_count++; | |
272 | } | |
273 | ov = U(key_map[i]); | |
274 | if (v == ov) | |
275 | break; /* nothing to do */ | |
276 | /* | |
277 | * Attention Key. | |
278 | */ | |
279 | if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN)) | |
280 | return -EPERM; | |
281 | key_map[i] = U(v); | |
282 | if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT)) | |
283 | compute_shiftstate(); | |
284 | break; | |
285 | } | |
286 | return 0; | |
287 | } | |
288 | #undef i | |
289 | #undef s | |
290 | #undef v | |
291 | ||
292 | static inline int | |
293 | do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm) | |
294 | { | |
295 | struct kbkeycode tmp; | |
296 | int kc = 0; | |
297 | ||
298 | if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode))) | |
299 | return -EFAULT; | |
300 | switch (cmd) { | |
301 | case KDGETKEYCODE: | |
302 | kc = getkeycode(tmp.scancode); | |
303 | if (kc >= 0) | |
304 | kc = put_user(kc, &user_kbkc->keycode); | |
305 | break; | |
306 | case KDSETKEYCODE: | |
307 | if (!perm) | |
308 | return -EPERM; | |
309 | kc = setkeycode(tmp.scancode, tmp.keycode); | |
310 | break; | |
311 | } | |
312 | return kc; | |
313 | } | |
314 | ||
315 | static inline int | |
316 | do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) | |
317 | { | |
318 | struct kbsentry *kbs; | |
319 | char *p; | |
320 | u_char *q; | |
321 | u_char __user *up; | |
322 | int sz; | |
323 | int delta; | |
324 | char *first_free, *fj, *fnw; | |
325 | int i, j, k; | |
326 | int ret; | |
327 | ||
0b360adb | 328 | if (!capable(CAP_SYS_TTY_CONFIG)) |
e3f17f0f | 329 | perm = 0; |
0b360adb | 330 | |
1da177e4 LT |
331 | kbs = kmalloc(sizeof(*kbs), GFP_KERNEL); |
332 | if (!kbs) { | |
333 | ret = -ENOMEM; | |
334 | goto reterr; | |
335 | } | |
336 | ||
337 | /* we mostly copy too much here (512bytes), but who cares ;) */ | |
338 | if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) { | |
339 | ret = -EFAULT; | |
340 | goto reterr; | |
341 | } | |
342 | kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0'; | |
343 | i = kbs->kb_func; | |
344 | ||
345 | switch (cmd) { | |
346 | case KDGKBSENT: | |
347 | sz = sizeof(kbs->kb_string) - 1; /* sz should have been | |
348 | a struct member */ | |
349 | up = user_kdgkb->kb_string; | |
350 | p = func_table[i]; | |
351 | if(p) | |
352 | for ( ; *p && sz; p++, sz--) | |
353 | if (put_user(*p, up++)) { | |
354 | ret = -EFAULT; | |
355 | goto reterr; | |
356 | } | |
357 | if (put_user('\0', up)) { | |
358 | ret = -EFAULT; | |
359 | goto reterr; | |
360 | } | |
361 | kfree(kbs); | |
362 | return ((p && *p) ? -EOVERFLOW : 0); | |
363 | case KDSKBSENT: | |
364 | if (!perm) { | |
365 | ret = -EPERM; | |
366 | goto reterr; | |
367 | } | |
368 | ||
369 | q = func_table[i]; | |
370 | first_free = funcbufptr + (funcbufsize - funcbufleft); | |
371 | for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) | |
372 | ; | |
373 | if (j < MAX_NR_FUNC) | |
374 | fj = func_table[j]; | |
375 | else | |
376 | fj = first_free; | |
377 | ||
378 | delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string); | |
379 | if (delta <= funcbufleft) { /* it fits in current buf */ | |
380 | if (j < MAX_NR_FUNC) { | |
381 | memmove(fj + delta, fj, first_free - fj); | |
382 | for (k = j; k < MAX_NR_FUNC; k++) | |
383 | if (func_table[k]) | |
384 | func_table[k] += delta; | |
385 | } | |
386 | if (!q) | |
387 | func_table[i] = fj; | |
388 | funcbufleft -= delta; | |
389 | } else { /* allocate a larger buffer */ | |
390 | sz = 256; | |
391 | while (sz < funcbufsize - funcbufleft + delta) | |
392 | sz <<= 1; | |
5cbded58 | 393 | fnw = kmalloc(sz, GFP_KERNEL); |
1da177e4 LT |
394 | if(!fnw) { |
395 | ret = -ENOMEM; | |
396 | goto reterr; | |
397 | } | |
398 | ||
399 | if (!q) | |
400 | func_table[i] = fj; | |
401 | if (fj > funcbufptr) | |
402 | memmove(fnw, funcbufptr, fj - funcbufptr); | |
403 | for (k = 0; k < j; k++) | |
404 | if (func_table[k]) | |
405 | func_table[k] = fnw + (func_table[k] - funcbufptr); | |
406 | ||
407 | if (first_free > fj) { | |
408 | memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj); | |
409 | for (k = j; k < MAX_NR_FUNC; k++) | |
410 | if (func_table[k]) | |
411 | func_table[k] = fnw + (func_table[k] - funcbufptr) + delta; | |
412 | } | |
413 | if (funcbufptr != func_buf) | |
414 | kfree(funcbufptr); | |
415 | funcbufptr = fnw; | |
416 | funcbufleft = funcbufleft - delta + sz - funcbufsize; | |
417 | funcbufsize = sz; | |
418 | } | |
419 | strcpy(func_table[i], kbs->kb_string); | |
420 | break; | |
421 | } | |
422 | ret = 0; | |
423 | reterr: | |
424 | kfree(kbs); | |
425 | return ret; | |
426 | } | |
427 | ||
428 | static inline int | |
429 | do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op) | |
430 | { | |
431 | struct consolefontdesc cfdarg; | |
432 | int i; | |
433 | ||
434 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) | |
435 | return -EFAULT; | |
436 | ||
437 | switch (cmd) { | |
438 | case PIO_FONTX: | |
439 | if (!perm) | |
440 | return -EPERM; | |
441 | op->op = KD_FONT_OP_SET; | |
442 | op->flags = KD_FONT_FLAG_OLD; | |
443 | op->width = 8; | |
444 | op->height = cfdarg.charheight; | |
445 | op->charcount = cfdarg.charcount; | |
446 | op->data = cfdarg.chardata; | |
447 | return con_font_op(vc_cons[fg_console].d, op); | |
448 | case GIO_FONTX: { | |
449 | op->op = KD_FONT_OP_GET; | |
450 | op->flags = KD_FONT_FLAG_OLD; | |
451 | op->width = 8; | |
452 | op->height = cfdarg.charheight; | |
453 | op->charcount = cfdarg.charcount; | |
454 | op->data = cfdarg.chardata; | |
455 | i = con_font_op(vc_cons[fg_console].d, op); | |
456 | if (i) | |
457 | return i; | |
458 | cfdarg.charheight = op->height; | |
459 | cfdarg.charcount = op->charcount; | |
460 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) | |
461 | return -EFAULT; | |
462 | return 0; | |
463 | } | |
464 | } | |
465 | return -EINVAL; | |
466 | } | |
467 | ||
468 | static inline int | |
469 | do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) | |
470 | { | |
471 | struct unimapdesc tmp; | |
472 | ||
473 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
474 | return -EFAULT; | |
475 | if (tmp.entries) | |
476 | if (!access_ok(VERIFY_WRITE, tmp.entries, | |
477 | tmp.entry_ct*sizeof(struct unipair))) | |
478 | return -EFAULT; | |
479 | switch (cmd) { | |
480 | case PIO_UNIMAP: | |
481 | if (!perm) | |
482 | return -EPERM; | |
483 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); | |
484 | case GIO_UNIMAP: | |
485 | if (!perm && fg_console != vc->vc_num) | |
486 | return -EPERM; | |
487 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries); | |
488 | } | |
489 | return 0; | |
490 | } | |
491 | ||
8b92e87d AC |
492 | |
493 | ||
1da177e4 LT |
494 | /* |
495 | * We handle the console-specific ioctl's here. We allow the | |
496 | * capability to modify any console, not just the fg_console. | |
497 | */ | |
498 | int vt_ioctl(struct tty_struct *tty, struct file * file, | |
499 | unsigned int cmd, unsigned long arg) | |
500 | { | |
c9f19e96 | 501 | struct vc_data *vc = tty->driver_data; |
1da177e4 LT |
502 | struct console_font_op op; /* used in multiple places here */ |
503 | struct kbd_struct * kbd; | |
504 | unsigned int console; | |
505 | unsigned char ucval; | |
1e0ad288 | 506 | unsigned int uival; |
1da177e4 LT |
507 | void __user *up = (void __user *)arg; |
508 | int i, perm; | |
9cc3c22b AC |
509 | int ret = 0; |
510 | ||
1da177e4 LT |
511 | console = vc->vc_num; |
512 | ||
ec79d605 | 513 | tty_lock(); |
9cc3c22b AC |
514 | |
515 | if (!vc_cons_allocated(console)) { /* impossible? */ | |
516 | ret = -ENOIOCTLCMD; | |
517 | goto out; | |
518 | } | |
519 | ||
1da177e4 LT |
520 | |
521 | /* | |
522 | * To have permissions to do most of the vt ioctls, we either have | |
523 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
524 | */ | |
525 | perm = 0; | |
526 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
527 | perm = 1; | |
528 | ||
529 | kbd = kbd_table + console; | |
530 | switch (cmd) { | |
e6885107 | 531 | case TIOCLINUX: |
a115902f JS |
532 | ret = tioclinux(tty, arg); |
533 | break; | |
1da177e4 LT |
534 | case KIOCSOUND: |
535 | if (!perm) | |
9cc3c22b | 536 | goto eperm; |
2c4e9671 AB |
537 | /* |
538 | * The use of PIT_TICK_RATE is historic, it used to be | |
539 | * the platform-dependent CLOCK_TICK_RATE between 2.6.12 | |
540 | * and 2.6.36, which was a minor but unfortunate ABI | |
541 | * change. | |
542 | */ | |
1da177e4 | 543 | if (arg) |
2c4e9671 | 544 | arg = PIT_TICK_RATE / arg; |
1da177e4 | 545 | kd_mksound(arg, 0); |
9cc3c22b | 546 | break; |
1da177e4 LT |
547 | |
548 | case KDMKTONE: | |
549 | if (!perm) | |
9cc3c22b | 550 | goto eperm; |
1da177e4 LT |
551 | { |
552 | unsigned int ticks, count; | |
553 | ||
554 | /* | |
555 | * Generate the tone for the appropriate number of ticks. | |
556 | * If the time is zero, turn off sound ourselves. | |
557 | */ | |
558 | ticks = HZ * ((arg >> 16) & 0xffff) / 1000; | |
559 | count = ticks ? (arg & 0xffff) : 0; | |
560 | if (count) | |
2c4e9671 | 561 | count = PIT_TICK_RATE / count; |
1da177e4 | 562 | kd_mksound(count, ticks); |
9cc3c22b | 563 | break; |
1da177e4 LT |
564 | } |
565 | ||
566 | case KDGKBTYPE: | |
567 | /* | |
568 | * this is naive. | |
569 | */ | |
570 | ucval = KB_101; | |
571 | goto setchar; | |
572 | ||
573 | /* | |
574 | * These cannot be implemented on any machine that implements | |
575 | * ioperm() in user level (such as Alpha PCs) or not at all. | |
576 | * | |
577 | * XXX: you should never use these, just call ioperm directly.. | |
578 | */ | |
579 | #ifdef CONFIG_X86 | |
580 | case KDADDIO: | |
581 | case KDDELIO: | |
582 | /* | |
583 | * KDADDIO and KDDELIO may be able to add ports beyond what | |
584 | * we reject here, but to be safe... | |
585 | */ | |
9cc3c22b AC |
586 | if (arg < GPFIRST || arg > GPLAST) { |
587 | ret = -EINVAL; | |
588 | break; | |
589 | } | |
590 | ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; | |
591 | break; | |
1da177e4 LT |
592 | |
593 | case KDENABIO: | |
594 | case KDDISABIO: | |
9cc3c22b | 595 | ret = sys_ioperm(GPFIRST, GPNUM, |
1da177e4 | 596 | (cmd == KDENABIO)) ? -ENXIO : 0; |
9cc3c22b | 597 | break; |
1da177e4 LT |
598 | #endif |
599 | ||
600 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ | |
601 | ||
602 | case KDKBDREP: | |
603 | { | |
604 | struct kbd_repeat kbrep; | |
1da177e4 LT |
605 | |
606 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 607 | goto eperm; |
1da177e4 | 608 | |
9cc3c22b AC |
609 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) { |
610 | ret = -EFAULT; | |
611 | break; | |
612 | } | |
613 | ret = kbd_rate(&kbrep); | |
614 | if (ret) | |
615 | break; | |
1da177e4 | 616 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) |
9cc3c22b AC |
617 | ret = -EFAULT; |
618 | break; | |
1da177e4 LT |
619 | } |
620 | ||
621 | case KDSETMODE: | |
622 | /* | |
623 | * currently, setting the mode from KD_TEXT to KD_GRAPHICS | |
624 | * doesn't do a whole lot. i'm not sure if it should do any | |
625 | * restoration of modes or what... | |
626 | * | |
627 | * XXX It should at least call into the driver, fbdev's definitely | |
628 | * need to restore their engine state. --BenH | |
629 | */ | |
630 | if (!perm) | |
9cc3c22b | 631 | goto eperm; |
1da177e4 LT |
632 | switch (arg) { |
633 | case KD_GRAPHICS: | |
634 | break; | |
635 | case KD_TEXT0: | |
636 | case KD_TEXT1: | |
637 | arg = KD_TEXT; | |
638 | case KD_TEXT: | |
639 | break; | |
640 | default: | |
9cc3c22b AC |
641 | ret = -EINVAL; |
642 | goto out; | |
1da177e4 LT |
643 | } |
644 | if (vc->vc_mode == (unsigned char) arg) | |
9cc3c22b | 645 | break; |
1da177e4 LT |
646 | vc->vc_mode = (unsigned char) arg; |
647 | if (console != fg_console) | |
9cc3c22b | 648 | break; |
1da177e4 LT |
649 | /* |
650 | * explicitly blank/unblank the screen if switching modes | |
651 | */ | |
652 | acquire_console_sem(); | |
653 | if (arg == KD_TEXT) | |
654 | do_unblank_screen(1); | |
655 | else | |
656 | do_blank_screen(1); | |
657 | release_console_sem(); | |
9cc3c22b | 658 | break; |
1da177e4 LT |
659 | |
660 | case KDGETMODE: | |
1e0ad288 | 661 | uival = vc->vc_mode; |
1da177e4 LT |
662 | goto setint; |
663 | ||
664 | case KDMAPDISP: | |
665 | case KDUNMAPDISP: | |
666 | /* | |
667 | * these work like a combination of mmap and KDENABIO. | |
668 | * this could be easily finished. | |
669 | */ | |
9cc3c22b AC |
670 | ret = -EINVAL; |
671 | break; | |
1da177e4 LT |
672 | |
673 | case KDSKBMODE: | |
674 | if (!perm) | |
9cc3c22b | 675 | goto eperm; |
1da177e4 LT |
676 | switch(arg) { |
677 | case K_RAW: | |
678 | kbd->kbdmode = VC_RAW; | |
679 | break; | |
680 | case K_MEDIUMRAW: | |
681 | kbd->kbdmode = VC_MEDIUMRAW; | |
682 | break; | |
683 | case K_XLATE: | |
684 | kbd->kbdmode = VC_XLATE; | |
685 | compute_shiftstate(); | |
686 | break; | |
687 | case K_UNICODE: | |
688 | kbd->kbdmode = VC_UNICODE; | |
689 | compute_shiftstate(); | |
690 | break; | |
691 | default: | |
9cc3c22b AC |
692 | ret = -EINVAL; |
693 | goto out; | |
1da177e4 LT |
694 | } |
695 | tty_ldisc_flush(tty); | |
9cc3c22b | 696 | break; |
1da177e4 LT |
697 | |
698 | case KDGKBMODE: | |
1e0ad288 | 699 | uival = ((kbd->kbdmode == VC_RAW) ? K_RAW : |
1da177e4 LT |
700 | (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW : |
701 | (kbd->kbdmode == VC_UNICODE) ? K_UNICODE : | |
702 | K_XLATE); | |
703 | goto setint; | |
704 | ||
705 | /* this could be folded into KDSKBMODE, but for compatibility | |
706 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ | |
707 | case KDSKBMETA: | |
708 | switch(arg) { | |
709 | case K_METABIT: | |
710 | clr_vc_kbd_mode(kbd, VC_META); | |
711 | break; | |
712 | case K_ESCPREFIX: | |
713 | set_vc_kbd_mode(kbd, VC_META); | |
714 | break; | |
715 | default: | |
9cc3c22b | 716 | ret = -EINVAL; |
1da177e4 | 717 | } |
9cc3c22b | 718 | break; |
1da177e4 LT |
719 | |
720 | case KDGKBMETA: | |
1e0ad288 | 721 | uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT); |
1da177e4 | 722 | setint: |
1e0ad288 | 723 | ret = put_user(uival, (int __user *)arg); |
9cc3c22b | 724 | break; |
1da177e4 LT |
725 | |
726 | case KDGETKEYCODE: | |
727 | case KDSETKEYCODE: | |
728 | if(!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b AC |
729 | perm = 0; |
730 | ret = do_kbkeycode_ioctl(cmd, up, perm); | |
731 | break; | |
1da177e4 LT |
732 | |
733 | case KDGKBENT: | |
734 | case KDSKBENT: | |
9cc3c22b AC |
735 | ret = do_kdsk_ioctl(cmd, up, perm, kbd); |
736 | break; | |
1da177e4 LT |
737 | |
738 | case KDGKBSENT: | |
739 | case KDSKBSENT: | |
9cc3c22b AC |
740 | ret = do_kdgkb_ioctl(cmd, up, perm); |
741 | break; | |
1da177e4 LT |
742 | |
743 | case KDGKBDIACR: | |
744 | { | |
745 | struct kbdiacrs __user *a = up; | |
04c71976 ST |
746 | struct kbdiacr diacr; |
747 | int i; | |
1da177e4 | 748 | |
9cc3c22b AC |
749 | if (put_user(accent_table_size, &a->kb_cnt)) { |
750 | ret = -EFAULT; | |
751 | break; | |
752 | } | |
04c71976 ST |
753 | for (i = 0; i < accent_table_size; i++) { |
754 | diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr); | |
755 | diacr.base = conv_uni_to_8bit(accent_table[i].base); | |
756 | diacr.result = conv_uni_to_8bit(accent_table[i].result); | |
9cc3c22b AC |
757 | if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) { |
758 | ret = -EFAULT; | |
759 | break; | |
760 | } | |
04c71976 | 761 | } |
9cc3c22b | 762 | break; |
04c71976 ST |
763 | } |
764 | case KDGKBDIACRUC: | |
765 | { | |
766 | struct kbdiacrsuc __user *a = up; | |
767 | ||
768 | if (put_user(accent_table_size, &a->kb_cnt)) | |
9cc3c22b AC |
769 | ret = -EFAULT; |
770 | else if (copy_to_user(a->kbdiacruc, accent_table, | |
771 | accent_table_size*sizeof(struct kbdiacruc))) | |
772 | ret = -EFAULT; | |
773 | break; | |
1da177e4 LT |
774 | } |
775 | ||
776 | case KDSKBDIACR: | |
777 | { | |
778 | struct kbdiacrs __user *a = up; | |
04c71976 ST |
779 | struct kbdiacr diacr; |
780 | unsigned int ct; | |
781 | int i; | |
782 | ||
783 | if (!perm) | |
9cc3c22b AC |
784 | goto eperm; |
785 | if (get_user(ct,&a->kb_cnt)) { | |
786 | ret = -EFAULT; | |
787 | break; | |
788 | } | |
789 | if (ct >= MAX_DIACR) { | |
790 | ret = -EINVAL; | |
791 | break; | |
792 | } | |
04c71976 ST |
793 | accent_table_size = ct; |
794 | for (i = 0; i < ct; i++) { | |
9cc3c22b AC |
795 | if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) { |
796 | ret = -EFAULT; | |
797 | break; | |
798 | } | |
04c71976 ST |
799 | accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr); |
800 | accent_table[i].base = conv_8bit_to_uni(diacr.base); | |
801 | accent_table[i].result = conv_8bit_to_uni(diacr.result); | |
802 | } | |
9cc3c22b | 803 | break; |
04c71976 ST |
804 | } |
805 | ||
806 | case KDSKBDIACRUC: | |
807 | { | |
808 | struct kbdiacrsuc __user *a = up; | |
1da177e4 LT |
809 | unsigned int ct; |
810 | ||
811 | if (!perm) | |
9cc3c22b AC |
812 | goto eperm; |
813 | if (get_user(ct,&a->kb_cnt)) { | |
814 | ret = -EFAULT; | |
815 | break; | |
816 | } | |
817 | if (ct >= MAX_DIACR) { | |
818 | ret = -EINVAL; | |
819 | break; | |
820 | } | |
1da177e4 | 821 | accent_table_size = ct; |
04c71976 | 822 | if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc))) |
9cc3c22b AC |
823 | ret = -EFAULT; |
824 | break; | |
1da177e4 LT |
825 | } |
826 | ||
827 | /* the ioctls below read/set the flags usually shown in the leds */ | |
828 | /* don't use them - they will go away without warning */ | |
829 | case KDGKBLED: | |
830 | ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4); | |
831 | goto setchar; | |
832 | ||
833 | case KDSKBLED: | |
834 | if (!perm) | |
9cc3c22b AC |
835 | goto eperm; |
836 | if (arg & ~0x77) { | |
837 | ret = -EINVAL; | |
838 | break; | |
839 | } | |
1da177e4 LT |
840 | kbd->ledflagstate = (arg & 7); |
841 | kbd->default_ledflagstate = ((arg >> 4) & 7); | |
842 | set_leds(); | |
9cc3c22b | 843 | break; |
1da177e4 LT |
844 | |
845 | /* the ioctls below only set the lights, not the functions */ | |
846 | /* for those, see KDGKBLED and KDSKBLED above */ | |
847 | case KDGETLED: | |
848 | ucval = getledstate(); | |
849 | setchar: | |
9cc3c22b AC |
850 | ret = put_user(ucval, (char __user *)arg); |
851 | break; | |
1da177e4 LT |
852 | |
853 | case KDSETLED: | |
854 | if (!perm) | |
9cc3c22b | 855 | goto eperm; |
1da177e4 | 856 | setledstate(kbd, arg); |
9cc3c22b | 857 | break; |
1da177e4 LT |
858 | |
859 | /* | |
860 | * A process can indicate its willingness to accept signals | |
861 | * generated by pressing an appropriate key combination. | |
862 | * Thus, one can have a daemon that e.g. spawns a new console | |
863 | * upon a keypress and then changes to it. | |
864 | * See also the kbrequest field of inittab(5). | |
865 | */ | |
866 | case KDSIGACCEPT: | |
867 | { | |
1da177e4 | 868 | if (!perm || !capable(CAP_KILL)) |
9cc3c22b | 869 | goto eperm; |
7ed20e1a | 870 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
9cc3c22b AC |
871 | ret = -EINVAL; |
872 | else { | |
873 | spin_lock_irq(&vt_spawn_con.lock); | |
874 | put_pid(vt_spawn_con.pid); | |
875 | vt_spawn_con.pid = get_pid(task_pid(current)); | |
876 | vt_spawn_con.sig = arg; | |
877 | spin_unlock_irq(&vt_spawn_con.lock); | |
878 | } | |
879 | break; | |
1da177e4 LT |
880 | } |
881 | ||
882 | case VT_SETMODE: | |
883 | { | |
884 | struct vt_mode tmp; | |
885 | ||
886 | if (!perm) | |
9cc3c22b AC |
887 | goto eperm; |
888 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) { | |
889 | ret = -EFAULT; | |
890 | goto out; | |
891 | } | |
87a6aca5 | 892 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) { |
9cc3c22b AC |
893 | ret = -EINVAL; |
894 | goto out; | |
895 | } | |
1da177e4 LT |
896 | acquire_console_sem(); |
897 | vc->vt_mode = tmp; | |
898 | /* the frsig is ignored, so we set it to 0 */ | |
899 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
900 | put_pid(vc->vt_pid); |
901 | vc->vt_pid = get_pid(task_pid(current)); | |
1da177e4 LT |
902 | /* no switch is required -- saw@shade.msu.ru */ |
903 | vc->vt_newvt = -1; | |
904 | release_console_sem(); | |
9cc3c22b | 905 | break; |
1da177e4 LT |
906 | } |
907 | ||
908 | case VT_GETMODE: | |
909 | { | |
910 | struct vt_mode tmp; | |
911 | int rc; | |
912 | ||
913 | acquire_console_sem(); | |
914 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); | |
915 | release_console_sem(); | |
916 | ||
917 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); | |
9cc3c22b AC |
918 | if (rc) |
919 | ret = -EFAULT; | |
920 | break; | |
1da177e4 LT |
921 | } |
922 | ||
923 | /* | |
924 | * Returns global vt state. Note that VT 0 is always open, since | |
925 | * it's an alias for the current VT, and people can't use it here. | |
926 | * We cannot return state for more than 16 VTs, since v_state is short. | |
927 | */ | |
928 | case VT_GETSTATE: | |
929 | { | |
930 | struct vt_stat __user *vtstat = up; | |
931 | unsigned short state, mask; | |
932 | ||
933 | if (put_user(fg_console + 1, &vtstat->v_active)) | |
9cc3c22b AC |
934 | ret = -EFAULT; |
935 | else { | |
936 | state = 1; /* /dev/tty0 is always open */ | |
937 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; | |
938 | ++i, mask <<= 1) | |
939 | if (VT_IS_IN_USE(i)) | |
940 | state |= mask; | |
941 | ret = put_user(state, &vtstat->v_state); | |
942 | } | |
943 | break; | |
1da177e4 LT |
944 | } |
945 | ||
946 | /* | |
947 | * Returns the first available (non-opened) console. | |
948 | */ | |
949 | case VT_OPENQRY: | |
950 | for (i = 0; i < MAX_NR_CONSOLES; ++i) | |
951 | if (! VT_IS_IN_USE(i)) | |
952 | break; | |
1e0ad288 | 953 | uival = i < MAX_NR_CONSOLES ? (i+1) : -1; |
1da177e4 LT |
954 | goto setint; |
955 | ||
956 | /* | |
957 | * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, | |
958 | * with num >= 1 (switches to vt 0, our console, are not allowed, just | |
959 | * to preserve sanity). | |
960 | */ | |
961 | case VT_ACTIVATE: | |
962 | if (!perm) | |
9cc3c22b | 963 | goto eperm; |
1da177e4 | 964 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b AC |
965 | ret = -ENXIO; |
966 | else { | |
967 | arg--; | |
968 | acquire_console_sem(); | |
969 | ret = vc_allocate(arg); | |
970 | release_console_sem(); | |
971 | if (ret) | |
972 | break; | |
973 | set_console(arg); | |
974 | } | |
975 | break; | |
1da177e4 | 976 | |
d3b5cffc AC |
977 | case VT_SETACTIVATE: |
978 | { | |
979 | struct vt_setactivate vsa; | |
980 | ||
981 | if (!perm) | |
982 | goto eperm; | |
983 | ||
984 | if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg, | |
a09efb07 JS |
985 | sizeof(struct vt_setactivate))) { |
986 | ret = -EFAULT; | |
987 | goto out; | |
988 | } | |
d3b5cffc AC |
989 | if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES) |
990 | ret = -ENXIO; | |
991 | else { | |
992 | vsa.console--; | |
993 | acquire_console_sem(); | |
994 | ret = vc_allocate(vsa.console); | |
995 | if (ret == 0) { | |
996 | struct vc_data *nvc; | |
997 | /* This is safe providing we don't drop the | |
998 | console sem between vc_allocate and | |
999 | finishing referencing nvc */ | |
1000 | nvc = vc_cons[vsa.console].d; | |
1001 | nvc->vt_mode = vsa.mode; | |
1002 | nvc->vt_mode.frsig = 0; | |
1003 | put_pid(nvc->vt_pid); | |
1004 | nvc->vt_pid = get_pid(task_pid(current)); | |
1005 | } | |
1006 | release_console_sem(); | |
1007 | if (ret) | |
1008 | break; | |
1009 | /* Commence switch and lock */ | |
1010 | set_console(arg); | |
1011 | } | |
1012 | } | |
1013 | ||
1da177e4 LT |
1014 | /* |
1015 | * wait until the specified VT has been activated | |
1016 | */ | |
1017 | case VT_WAITACTIVE: | |
1018 | if (!perm) | |
9cc3c22b | 1019 | goto eperm; |
1da177e4 | 1020 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b AC |
1021 | ret = -ENXIO; |
1022 | else | |
8b92e87d | 1023 | ret = vt_waitactive(arg); |
9cc3c22b | 1024 | break; |
1da177e4 LT |
1025 | |
1026 | /* | |
1027 | * If a vt is under process control, the kernel will not switch to it | |
1028 | * immediately, but postpone the operation until the process calls this | |
1029 | * ioctl, allowing the switch to complete. | |
1030 | * | |
1031 | * According to the X sources this is the behavior: | |
1032 | * 0: pending switch-from not OK | |
1033 | * 1: pending switch-from OK | |
1034 | * 2: completed switch-to OK | |
1035 | */ | |
1036 | case VT_RELDISP: | |
1037 | if (!perm) | |
9cc3c22b | 1038 | goto eperm; |
1da177e4 | 1039 | |
9cc3c22b AC |
1040 | if (vc->vt_mode.mode != VT_PROCESS) { |
1041 | ret = -EINVAL; | |
1042 | break; | |
1043 | } | |
1da177e4 LT |
1044 | /* |
1045 | * Switching-from response | |
1046 | */ | |
8792f961 | 1047 | acquire_console_sem(); |
1da177e4 LT |
1048 | if (vc->vt_newvt >= 0) { |
1049 | if (arg == 0) | |
1050 | /* | |
1051 | * Switch disallowed, so forget we were trying | |
1052 | * to do it. | |
1053 | */ | |
1054 | vc->vt_newvt = -1; | |
1055 | ||
1056 | else { | |
1057 | /* | |
1058 | * The current vt has been released, so | |
1059 | * complete the switch. | |
1060 | */ | |
1061 | int newvt; | |
1da177e4 LT |
1062 | newvt = vc->vt_newvt; |
1063 | vc->vt_newvt = -1; | |
9cc3c22b AC |
1064 | ret = vc_allocate(newvt); |
1065 | if (ret) { | |
1da177e4 | 1066 | release_console_sem(); |
9cc3c22b | 1067 | break; |
1da177e4 LT |
1068 | } |
1069 | /* | |
1070 | * When we actually do the console switch, | |
1071 | * make sure we are atomic with respect to | |
1072 | * other console switches.. | |
1073 | */ | |
1074 | complete_change_console(vc_cons[newvt].d); | |
1da177e4 | 1075 | } |
9cc3c22b AC |
1076 | } else { |
1077 | /* | |
1078 | * Switched-to response | |
1079 | */ | |
1da177e4 LT |
1080 | /* |
1081 | * If it's just an ACK, ignore it | |
1082 | */ | |
9cc3c22b AC |
1083 | if (arg != VT_ACKACQ) |
1084 | ret = -EINVAL; | |
1da177e4 | 1085 | } |
8792f961 | 1086 | release_console_sem(); |
9cc3c22b | 1087 | break; |
1da177e4 LT |
1088 | |
1089 | /* | |
1090 | * Disallocate memory associated to VT (but leave VT1) | |
1091 | */ | |
1092 | case VT_DISALLOCATE: | |
9cc3c22b AC |
1093 | if (arg > MAX_NR_CONSOLES) { |
1094 | ret = -ENXIO; | |
1095 | break; | |
1096 | } | |
1da177e4 | 1097 | if (arg == 0) { |
ca9bda00 | 1098 | /* deallocate all unused consoles, but leave 0 */ |
1da177e4 LT |
1099 | acquire_console_sem(); |
1100 | for (i=1; i<MAX_NR_CONSOLES; i++) | |
1101 | if (! VT_BUSY(i)) | |
ca9bda00 | 1102 | vc_deallocate(i); |
1da177e4 LT |
1103 | release_console_sem(); |
1104 | } else { | |
ca9bda00 | 1105 | /* deallocate a single console, if possible */ |
1da177e4 LT |
1106 | arg--; |
1107 | if (VT_BUSY(arg)) | |
9cc3c22b AC |
1108 | ret = -EBUSY; |
1109 | else if (arg) { /* leave 0 */ | |
1da177e4 | 1110 | acquire_console_sem(); |
ca9bda00 | 1111 | vc_deallocate(arg); |
1da177e4 LT |
1112 | release_console_sem(); |
1113 | } | |
1114 | } | |
9cc3c22b | 1115 | break; |
1da177e4 LT |
1116 | |
1117 | case VT_RESIZE: | |
1118 | { | |
1119 | struct vt_sizes __user *vtsizes = up; | |
e400b6ec AD |
1120 | struct vc_data *vc; |
1121 | ||
1da177e4 LT |
1122 | ushort ll,cc; |
1123 | if (!perm) | |
9cc3c22b | 1124 | goto eperm; |
1da177e4 LT |
1125 | if (get_user(ll, &vtsizes->v_rows) || |
1126 | get_user(cc, &vtsizes->v_cols)) | |
9cc3c22b AC |
1127 | ret = -EFAULT; |
1128 | else { | |
8c9a9dd0 | 1129 | acquire_console_sem(); |
9cc3c22b AC |
1130 | for (i = 0; i < MAX_NR_CONSOLES; i++) { |
1131 | vc = vc_cons[i].d; | |
e400b6ec | 1132 | |
9cc3c22b AC |
1133 | if (vc) { |
1134 | vc->vc_resize_user = 1; | |
8c9a9dd0 | 1135 | vc_resize(vc_cons[i].d, cc, ll); |
9cc3c22b | 1136 | } |
e400b6ec | 1137 | } |
8c9a9dd0 | 1138 | release_console_sem(); |
e400b6ec | 1139 | } |
9cc3c22b | 1140 | break; |
1da177e4 LT |
1141 | } |
1142 | ||
1143 | case VT_RESIZEX: | |
1144 | { | |
1145 | struct vt_consize __user *vtconsize = up; | |
1146 | ushort ll,cc,vlin,clin,vcol,ccol; | |
1147 | if (!perm) | |
9cc3c22b | 1148 | goto eperm; |
1da177e4 | 1149 | if (!access_ok(VERIFY_READ, vtconsize, |
9cc3c22b AC |
1150 | sizeof(struct vt_consize))) { |
1151 | ret = -EFAULT; | |
1152 | break; | |
1153 | } | |
1154 | /* FIXME: Should check the copies properly */ | |
1da177e4 LT |
1155 | __get_user(ll, &vtconsize->v_rows); |
1156 | __get_user(cc, &vtconsize->v_cols); | |
1157 | __get_user(vlin, &vtconsize->v_vlin); | |
1158 | __get_user(clin, &vtconsize->v_clin); | |
1159 | __get_user(vcol, &vtconsize->v_vcol); | |
1160 | __get_user(ccol, &vtconsize->v_ccol); | |
1161 | vlin = vlin ? vlin : vc->vc_scan_lines; | |
1162 | if (clin) { | |
1163 | if (ll) { | |
9cc3c22b AC |
1164 | if (ll != vlin/clin) { |
1165 | /* Parameters don't add up */ | |
1166 | ret = -EINVAL; | |
1167 | break; | |
1168 | } | |
1da177e4 LT |
1169 | } else |
1170 | ll = vlin/clin; | |
1171 | } | |
1172 | if (vcol && ccol) { | |
1173 | if (cc) { | |
9cc3c22b AC |
1174 | if (cc != vcol/ccol) { |
1175 | ret = -EINVAL; | |
1176 | break; | |
1177 | } | |
1da177e4 LT |
1178 | } else |
1179 | cc = vcol/ccol; | |
1180 | } | |
1181 | ||
9cc3c22b AC |
1182 | if (clin > 32) { |
1183 | ret = -EINVAL; | |
1184 | break; | |
1185 | } | |
1da177e4 LT |
1186 | |
1187 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
1188 | if (!vc_cons[i].d) | |
1189 | continue; | |
1190 | acquire_console_sem(); | |
1191 | if (vlin) | |
1192 | vc_cons[i].d->vc_scan_lines = vlin; | |
1193 | if (clin) | |
1194 | vc_cons[i].d->vc_font.height = clin; | |
e400b6ec | 1195 | vc_cons[i].d->vc_resize_user = 1; |
1da177e4 LT |
1196 | vc_resize(vc_cons[i].d, cc, ll); |
1197 | release_console_sem(); | |
1198 | } | |
9cc3c22b | 1199 | break; |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | case PIO_FONT: { | |
1203 | if (!perm) | |
9cc3c22b | 1204 | goto eperm; |
1da177e4 LT |
1205 | op.op = KD_FONT_OP_SET; |
1206 | op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ | |
1207 | op.width = 8; | |
1208 | op.height = 0; | |
1209 | op.charcount = 256; | |
1210 | op.data = up; | |
9cc3c22b AC |
1211 | ret = con_font_op(vc_cons[fg_console].d, &op); |
1212 | break; | |
1da177e4 LT |
1213 | } |
1214 | ||
1215 | case GIO_FONT: { | |
1216 | op.op = KD_FONT_OP_GET; | |
1217 | op.flags = KD_FONT_FLAG_OLD; | |
1218 | op.width = 8; | |
1219 | op.height = 32; | |
1220 | op.charcount = 256; | |
1221 | op.data = up; | |
9cc3c22b AC |
1222 | ret = con_font_op(vc_cons[fg_console].d, &op); |
1223 | break; | |
1da177e4 LT |
1224 | } |
1225 | ||
1226 | case PIO_CMAP: | |
1227 | if (!perm) | |
9cc3c22b AC |
1228 | ret = -EPERM; |
1229 | else | |
1230 | ret = con_set_cmap(up); | |
1231 | break; | |
1da177e4 LT |
1232 | |
1233 | case GIO_CMAP: | |
9cc3c22b AC |
1234 | ret = con_get_cmap(up); |
1235 | break; | |
1da177e4 LT |
1236 | |
1237 | case PIO_FONTX: | |
1238 | case GIO_FONTX: | |
9cc3c22b AC |
1239 | ret = do_fontx_ioctl(cmd, up, perm, &op); |
1240 | break; | |
1da177e4 LT |
1241 | |
1242 | case PIO_FONTRESET: | |
1243 | { | |
1244 | if (!perm) | |
9cc3c22b | 1245 | goto eperm; |
1da177e4 LT |
1246 | |
1247 | #ifdef BROKEN_GRAPHICS_PROGRAMS | |
1248 | /* With BROKEN_GRAPHICS_PROGRAMS defined, the default | |
1249 | font is not saved. */ | |
9cc3c22b AC |
1250 | ret = -ENOSYS; |
1251 | break; | |
1da177e4 LT |
1252 | #else |
1253 | { | |
1254 | op.op = KD_FONT_OP_SET_DEFAULT; | |
1255 | op.data = NULL; | |
9cc3c22b AC |
1256 | ret = con_font_op(vc_cons[fg_console].d, &op); |
1257 | if (ret) | |
1258 | break; | |
1da177e4 | 1259 | con_set_default_unimap(vc_cons[fg_console].d); |
9cc3c22b | 1260 | break; |
1da177e4 LT |
1261 | } |
1262 | #endif | |
1263 | } | |
1264 | ||
1265 | case KDFONTOP: { | |
9cc3c22b AC |
1266 | if (copy_from_user(&op, up, sizeof(op))) { |
1267 | ret = -EFAULT; | |
1268 | break; | |
1269 | } | |
1da177e4 | 1270 | if (!perm && op.op != KD_FONT_OP_GET) |
9cc3c22b AC |
1271 | goto eperm; |
1272 | ret = con_font_op(vc, &op); | |
1273 | if (ret) | |
1274 | break; | |
1da177e4 | 1275 | if (copy_to_user(up, &op, sizeof(op))) |
9cc3c22b AC |
1276 | ret = -EFAULT; |
1277 | break; | |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | case PIO_SCRNMAP: | |
1281 | if (!perm) | |
9cc3c22b AC |
1282 | ret = -EPERM; |
1283 | else | |
1284 | ret = con_set_trans_old(up); | |
1285 | break; | |
1da177e4 LT |
1286 | |
1287 | case GIO_SCRNMAP: | |
9cc3c22b AC |
1288 | ret = con_get_trans_old(up); |
1289 | break; | |
1da177e4 LT |
1290 | |
1291 | case PIO_UNISCRNMAP: | |
1292 | if (!perm) | |
9cc3c22b AC |
1293 | ret = -EPERM; |
1294 | else | |
1295 | ret = con_set_trans_new(up); | |
1296 | break; | |
1da177e4 LT |
1297 | |
1298 | case GIO_UNISCRNMAP: | |
9cc3c22b AC |
1299 | ret = con_get_trans_new(up); |
1300 | break; | |
1da177e4 LT |
1301 | |
1302 | case PIO_UNIMAPCLR: | |
1303 | { struct unimapinit ui; | |
1304 | if (!perm) | |
9cc3c22b AC |
1305 | goto eperm; |
1306 | ret = copy_from_user(&ui, up, sizeof(struct unimapinit)); | |
3fde85df DC |
1307 | if (ret) |
1308 | ret = -EFAULT; | |
1309 | else | |
9cc3c22b AC |
1310 | con_clear_unimap(vc, &ui); |
1311 | break; | |
1da177e4 LT |
1312 | } |
1313 | ||
1314 | case PIO_UNIMAP: | |
1315 | case GIO_UNIMAP: | |
9cc3c22b AC |
1316 | ret = do_unimap_ioctl(cmd, up, perm, vc); |
1317 | break; | |
1da177e4 LT |
1318 | |
1319 | case VT_LOCKSWITCH: | |
1320 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 1321 | goto eperm; |
1da177e4 | 1322 | vt_dont_switch = 1; |
9cc3c22b | 1323 | break; |
1da177e4 LT |
1324 | case VT_UNLOCKSWITCH: |
1325 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 1326 | goto eperm; |
1da177e4 | 1327 | vt_dont_switch = 0; |
9cc3c22b | 1328 | break; |
533475d3 | 1329 | case VT_GETHIFONTMASK: |
9cc3c22b AC |
1330 | ret = put_user(vc->vc_hi_font_mask, |
1331 | (unsigned short __user *)arg); | |
1332 | break; | |
8b92e87d AC |
1333 | case VT_WAITEVENT: |
1334 | ret = vt_event_wait_ioctl((struct vt_event __user *)arg); | |
1335 | break; | |
1da177e4 | 1336 | default: |
9cc3c22b | 1337 | ret = -ENOIOCTLCMD; |
1da177e4 | 1338 | } |
9cc3c22b | 1339 | out: |
ec79d605 | 1340 | tty_unlock(); |
9cc3c22b AC |
1341 | return ret; |
1342 | eperm: | |
1343 | ret = -EPERM; | |
1344 | goto out; | |
1da177e4 LT |
1345 | } |
1346 | ||
1da177e4 LT |
1347 | void reset_vc(struct vc_data *vc) |
1348 | { | |
1349 | vc->vc_mode = KD_TEXT; | |
2e8ecb9d | 1350 | kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE; |
1da177e4 LT |
1351 | vc->vt_mode.mode = VT_AUTO; |
1352 | vc->vt_mode.waitv = 0; | |
1353 | vc->vt_mode.relsig = 0; | |
1354 | vc->vt_mode.acqsig = 0; | |
1355 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
1356 | put_pid(vc->vt_pid); |
1357 | vc->vt_pid = NULL; | |
1da177e4 LT |
1358 | vc->vt_newvt = -1; |
1359 | if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ | |
1360 | reset_palette(vc); | |
1361 | } | |
1362 | ||
8b6312f4 EB |
1363 | void vc_SAK(struct work_struct *work) |
1364 | { | |
1365 | struct vc *vc_con = | |
1366 | container_of(work, struct vc, SAK_work); | |
1367 | struct vc_data *vc; | |
1368 | struct tty_struct *tty; | |
1369 | ||
1370 | acquire_console_sem(); | |
1371 | vc = vc_con->d; | |
1372 | if (vc) { | |
8ce73264 | 1373 | tty = vc->port.tty; |
8b6312f4 EB |
1374 | /* |
1375 | * SAK should also work in all raw modes and reset | |
1376 | * them properly. | |
1377 | */ | |
1378 | if (tty) | |
1379 | __do_SAK(tty); | |
1380 | reset_vc(vc); | |
1381 | } | |
1382 | release_console_sem(); | |
1383 | } | |
1384 | ||
e9216651 AB |
1385 | #ifdef CONFIG_COMPAT |
1386 | ||
1387 | struct compat_consolefontdesc { | |
1388 | unsigned short charcount; /* characters in font (256 or 512) */ | |
1389 | unsigned short charheight; /* scan lines per character (1-32) */ | |
1390 | compat_caddr_t chardata; /* font data in expanded form */ | |
1391 | }; | |
1392 | ||
1393 | static inline int | |
1394 | compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd, | |
1395 | int perm, struct console_font_op *op) | |
1396 | { | |
1397 | struct compat_consolefontdesc cfdarg; | |
1398 | int i; | |
1399 | ||
1400 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc))) | |
1401 | return -EFAULT; | |
1402 | ||
1403 | switch (cmd) { | |
1404 | case PIO_FONTX: | |
1405 | if (!perm) | |
1406 | return -EPERM; | |
1407 | op->op = KD_FONT_OP_SET; | |
1408 | op->flags = KD_FONT_FLAG_OLD; | |
1409 | op->width = 8; | |
1410 | op->height = cfdarg.charheight; | |
1411 | op->charcount = cfdarg.charcount; | |
1412 | op->data = compat_ptr(cfdarg.chardata); | |
1413 | return con_font_op(vc_cons[fg_console].d, op); | |
1414 | case GIO_FONTX: | |
1415 | op->op = KD_FONT_OP_GET; | |
1416 | op->flags = KD_FONT_FLAG_OLD; | |
1417 | op->width = 8; | |
1418 | op->height = cfdarg.charheight; | |
1419 | op->charcount = cfdarg.charcount; | |
1420 | op->data = compat_ptr(cfdarg.chardata); | |
1421 | i = con_font_op(vc_cons[fg_console].d, op); | |
1422 | if (i) | |
1423 | return i; | |
1424 | cfdarg.charheight = op->height; | |
1425 | cfdarg.charcount = op->charcount; | |
1426 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc))) | |
1427 | return -EFAULT; | |
1428 | return 0; | |
1429 | } | |
1430 | return -EINVAL; | |
1431 | } | |
1432 | ||
1433 | struct compat_console_font_op { | |
1434 | compat_uint_t op; /* operation code KD_FONT_OP_* */ | |
1435 | compat_uint_t flags; /* KD_FONT_FLAG_* */ | |
1436 | compat_uint_t width, height; /* font size */ | |
1437 | compat_uint_t charcount; | |
1438 | compat_caddr_t data; /* font data with height fixed to 32 */ | |
1439 | }; | |
1440 | ||
1441 | static inline int | |
1442 | compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop, | |
1443 | int perm, struct console_font_op *op, struct vc_data *vc) | |
1444 | { | |
1445 | int i; | |
1446 | ||
1447 | if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op))) | |
1448 | return -EFAULT; | |
1449 | if (!perm && op->op != KD_FONT_OP_GET) | |
1450 | return -EPERM; | |
1451 | op->data = compat_ptr(((struct compat_console_font_op *)op)->data); | |
1452 | op->flags |= KD_FONT_FLAG_OLD; | |
1453 | i = con_font_op(vc, op); | |
1454 | if (i) | |
1455 | return i; | |
1456 | ((struct compat_console_font_op *)op)->data = (unsigned long)op->data; | |
1457 | if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op))) | |
1458 | return -EFAULT; | |
1459 | return 0; | |
1460 | } | |
1461 | ||
1462 | struct compat_unimapdesc { | |
1463 | unsigned short entry_ct; | |
1464 | compat_caddr_t entries; | |
1465 | }; | |
1466 | ||
1467 | static inline int | |
1468 | compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud, | |
1469 | int perm, struct vc_data *vc) | |
1470 | { | |
1471 | struct compat_unimapdesc tmp; | |
1472 | struct unipair __user *tmp_entries; | |
1473 | ||
1474 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
1475 | return -EFAULT; | |
1476 | tmp_entries = compat_ptr(tmp.entries); | |
1477 | if (tmp_entries) | |
1478 | if (!access_ok(VERIFY_WRITE, tmp_entries, | |
1479 | tmp.entry_ct*sizeof(struct unipair))) | |
1480 | return -EFAULT; | |
1481 | switch (cmd) { | |
1482 | case PIO_UNIMAP: | |
1483 | if (!perm) | |
1484 | return -EPERM; | |
1485 | return con_set_unimap(vc, tmp.entry_ct, tmp_entries); | |
1486 | case GIO_UNIMAP: | |
1487 | if (!perm && fg_console != vc->vc_num) | |
1488 | return -EPERM; | |
1489 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries); | |
1490 | } | |
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | long vt_compat_ioctl(struct tty_struct *tty, struct file * file, | |
1495 | unsigned int cmd, unsigned long arg) | |
1496 | { | |
1497 | struct vc_data *vc = tty->driver_data; | |
1498 | struct console_font_op op; /* used in multiple places here */ | |
1499 | struct kbd_struct *kbd; | |
1500 | unsigned int console; | |
1501 | void __user *up = (void __user *)arg; | |
1502 | int perm; | |
1503 | int ret = 0; | |
1504 | ||
1505 | console = vc->vc_num; | |
1506 | ||
ec79d605 | 1507 | tty_lock(); |
e9216651 AB |
1508 | |
1509 | if (!vc_cons_allocated(console)) { /* impossible? */ | |
1510 | ret = -ENOIOCTLCMD; | |
1511 | goto out; | |
1512 | } | |
1513 | ||
1514 | /* | |
1515 | * To have permissions to do most of the vt ioctls, we either have | |
1516 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
1517 | */ | |
1518 | perm = 0; | |
1519 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
1520 | perm = 1; | |
1521 | ||
1522 | kbd = kbd_table + console; | |
1523 | switch (cmd) { | |
1524 | /* | |
1525 | * these need special handlers for incompatible data structures | |
1526 | */ | |
1527 | case PIO_FONTX: | |
1528 | case GIO_FONTX: | |
1529 | ret = compat_fontx_ioctl(cmd, up, perm, &op); | |
1530 | break; | |
1531 | ||
1532 | case KDFONTOP: | |
1533 | ret = compat_kdfontop_ioctl(up, perm, &op, vc); | |
1534 | break; | |
1535 | ||
1536 | case PIO_UNIMAP: | |
1537 | case GIO_UNIMAP: | |
4b1fe779 | 1538 | ret = compat_unimap_ioctl(cmd, up, perm, vc); |
e9216651 AB |
1539 | break; |
1540 | ||
1541 | /* | |
1542 | * all these treat 'arg' as an integer | |
1543 | */ | |
1544 | case KIOCSOUND: | |
1545 | case KDMKTONE: | |
1546 | #ifdef CONFIG_X86 | |
1547 | case KDADDIO: | |
1548 | case KDDELIO: | |
1549 | #endif | |
1550 | case KDSETMODE: | |
1551 | case KDMAPDISP: | |
1552 | case KDUNMAPDISP: | |
1553 | case KDSKBMODE: | |
1554 | case KDSKBMETA: | |
1555 | case KDSKBLED: | |
1556 | case KDSETLED: | |
1557 | case KDSIGACCEPT: | |
1558 | case VT_ACTIVATE: | |
1559 | case VT_WAITACTIVE: | |
1560 | case VT_RELDISP: | |
1561 | case VT_DISALLOCATE: | |
1562 | case VT_RESIZE: | |
1563 | case VT_RESIZEX: | |
1564 | goto fallback; | |
1565 | ||
1566 | /* | |
1567 | * the rest has a compatible data structure behind arg, | |
1568 | * but we have to convert it to a proper 64 bit pointer. | |
1569 | */ | |
1570 | default: | |
1571 | arg = (unsigned long)compat_ptr(arg); | |
1572 | goto fallback; | |
1573 | } | |
1574 | out: | |
ec79d605 | 1575 | tty_unlock(); |
e9216651 AB |
1576 | return ret; |
1577 | ||
1578 | fallback: | |
ec79d605 | 1579 | tty_unlock(); |
e9216651 AB |
1580 | return vt_ioctl(tty, file, cmd, arg); |
1581 | } | |
1582 | ||
1583 | ||
1584 | #endif /* CONFIG_COMPAT */ | |
1585 | ||
1586 | ||
1da177e4 | 1587 | /* |
d3b5cffc AC |
1588 | * Performs the back end of a vt switch. Called under the console |
1589 | * semaphore. | |
1da177e4 LT |
1590 | */ |
1591 | static void complete_change_console(struct vc_data *vc) | |
1592 | { | |
1593 | unsigned char old_vc_mode; | |
8b92e87d | 1594 | int old = fg_console; |
1da177e4 LT |
1595 | |
1596 | last_console = fg_console; | |
1597 | ||
1598 | /* | |
1599 | * If we're switching, we could be going from KD_GRAPHICS to | |
1600 | * KD_TEXT mode or vice versa, which means we need to blank or | |
1601 | * unblank the screen later. | |
1602 | */ | |
1603 | old_vc_mode = vc_cons[fg_console].d->vc_mode; | |
1604 | switch_screen(vc); | |
1605 | ||
1606 | /* | |
3dfcaf16 | 1607 | * This can't appear below a successful kill_pid(). If it did, |
1da177e4 LT |
1608 | * then the *blank_screen operation could occur while X, having |
1609 | * received acqsig, is waking up on another processor. This | |
1610 | * condition can lead to overlapping accesses to the VGA range | |
1611 | * and the framebuffer (causing system lockups). | |
1612 | * | |
1613 | * To account for this we duplicate this code below only if the | |
1614 | * controlling process is gone and we've called reset_vc. | |
1615 | */ | |
1616 | if (old_vc_mode != vc->vc_mode) { | |
1617 | if (vc->vc_mode == KD_TEXT) | |
1618 | do_unblank_screen(1); | |
1619 | else | |
1620 | do_blank_screen(1); | |
1621 | } | |
1622 | ||
1623 | /* | |
1624 | * If this new console is under process control, send it a signal | |
1625 | * telling it that it has acquired. Also check if it has died and | |
1626 | * clean up (similar to logic employed in change_console()) | |
1627 | */ | |
87a6aca5 | 1628 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1629 | /* |
3dfcaf16 | 1630 | * Send the signal as privileged - kill_pid() will |
1da177e4 LT |
1631 | * tell us if the process has gone or something else |
1632 | * is awry | |
1633 | */ | |
bde0d2c9 | 1634 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
1da177e4 LT |
1635 | /* |
1636 | * The controlling process has died, so we revert back to | |
1637 | * normal operation. In this case, we'll also change back | |
1638 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1639 | * but it saves the agony when the X server dies and the screen | |
1640 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1641 | * this outside of VT_PROCESS but there is no single process | |
1642 | * to account for and tracking tty count may be undesirable. | |
1643 | */ | |
1644 | reset_vc(vc); | |
1645 | ||
1646 | if (old_vc_mode != vc->vc_mode) { | |
1647 | if (vc->vc_mode == KD_TEXT) | |
1648 | do_unblank_screen(1); | |
1649 | else | |
1650 | do_blank_screen(1); | |
1651 | } | |
1652 | } | |
1653 | } | |
1654 | ||
1655 | /* | |
1656 | * Wake anyone waiting for their VT to activate | |
1657 | */ | |
8b92e87d | 1658 | vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num); |
1da177e4 LT |
1659 | return; |
1660 | } | |
1661 | ||
1662 | /* | |
1663 | * Performs the front-end of a vt switch | |
1664 | */ | |
1665 | void change_console(struct vc_data *new_vc) | |
1666 | { | |
1667 | struct vc_data *vc; | |
1668 | ||
1669 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) | |
1670 | return; | |
1671 | ||
1672 | /* | |
1673 | * If this vt is in process mode, then we need to handshake with | |
1674 | * that process before switching. Essentially, we store where that | |
1675 | * vt wants to switch to and wait for it to tell us when it's done | |
1676 | * (via VT_RELDISP ioctl). | |
1677 | * | |
1678 | * We also check to see if the controlling process still exists. | |
1679 | * If it doesn't, we reset this vt to auto mode and continue. | |
1680 | * This is a cheap way to track process control. The worst thing | |
1681 | * that can happen is: we send a signal to a process, it dies, and | |
1682 | * the switch gets "lost" waiting for a response; hopefully, the | |
1683 | * user will try again, we'll detect the process is gone (unless | |
1684 | * the user waits just the right amount of time :-) and revert the | |
1685 | * vt to auto control. | |
1686 | */ | |
1687 | vc = vc_cons[fg_console].d; | |
87a6aca5 | 1688 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1689 | /* |
3dfcaf16 | 1690 | * Send the signal as privileged - kill_pid() will |
1da177e4 | 1691 | * tell us if the process has gone or something else |
a64314e6 JL |
1692 | * is awry. |
1693 | * | |
1694 | * We need to set vt_newvt *before* sending the signal or we | |
1695 | * have a race. | |
1da177e4 | 1696 | */ |
a64314e6 | 1697 | vc->vt_newvt = new_vc->vc_num; |
bde0d2c9 | 1698 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
1da177e4 | 1699 | /* |
87a6aca5 GKH |
1700 | * It worked. Mark the vt to switch to and |
1701 | * return. The process needs to send us a | |
1702 | * VT_RELDISP ioctl to complete the switch. | |
1da177e4 | 1703 | */ |
87a6aca5 | 1704 | return; |
1da177e4 LT |
1705 | } |
1706 | ||
1707 | /* | |
87a6aca5 GKH |
1708 | * The controlling process has died, so we revert back to |
1709 | * normal operation. In this case, we'll also change back | |
1710 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1711 | * but it saves the agony when the X server dies and the screen | |
1712 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1713 | * this outside of VT_PROCESS but there is no single process | |
1714 | * to account for and tracking tty count may be undesirable. | |
1715 | */ | |
1716 | reset_vc(vc); | |
1717 | ||
1718 | /* | |
1719 | * Fall through to normal (VT_AUTO) handling of the switch... | |
1da177e4 LT |
1720 | */ |
1721 | } | |
1722 | ||
1723 | /* | |
1724 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode | |
1725 | */ | |
1726 | if (vc->vc_mode == KD_GRAPHICS) | |
1727 | return; | |
1728 | ||
1729 | complete_change_console(new_vc); | |
1730 | } | |
8d233558 AC |
1731 | |
1732 | /* Perform a kernel triggered VT switch for suspend/resume */ | |
1733 | ||
1734 | static int disable_vt_switch; | |
1735 | ||
1736 | int vt_move_to_console(unsigned int vt, int alloc) | |
1737 | { | |
1738 | int prev; | |
1739 | ||
1740 | acquire_console_sem(); | |
1741 | /* Graphics mode - up to X */ | |
1742 | if (disable_vt_switch) { | |
1743 | release_console_sem(); | |
1744 | return 0; | |
1745 | } | |
1746 | prev = fg_console; | |
1747 | ||
1748 | if (alloc && vc_allocate(vt)) { | |
1749 | /* we can't have a free VC for now. Too bad, | |
1750 | * we don't want to mess the screen for now. */ | |
1751 | release_console_sem(); | |
1752 | return -ENOSPC; | |
1753 | } | |
1754 | ||
1755 | if (set_console(vt)) { | |
1756 | /* | |
1757 | * We're unable to switch to the SUSPEND_CONSOLE. | |
1758 | * Let the calling function know so it can decide | |
1759 | * what to do. | |
1760 | */ | |
1761 | release_console_sem(); | |
1762 | return -EIO; | |
1763 | } | |
1764 | release_console_sem(); | |
be1bc288 | 1765 | tty_lock(); |
797938b5 | 1766 | if (vt_waitactive(vt + 1)) { |
8d233558 | 1767 | pr_debug("Suspend: Can't switch VCs."); |
be1bc288 | 1768 | tty_unlock(); |
8d233558 AC |
1769 | return -EINTR; |
1770 | } | |
be1bc288 | 1771 | tty_unlock(); |
8d233558 AC |
1772 | return prev; |
1773 | } | |
1774 | ||
1775 | /* | |
1776 | * Normally during a suspend, we allocate a new console and switch to it. | |
1777 | * When we resume, we switch back to the original console. This switch | |
1778 | * can be slow, so on systems where the framebuffer can handle restoration | |
1779 | * of video registers anyways, there's little point in doing the console | |
1780 | * switch. This function allows you to disable it by passing it '0'. | |
1781 | */ | |
1782 | void pm_set_vt_switch(int do_switch) | |
1783 | { | |
1784 | acquire_console_sem(); | |
1785 | disable_vt_switch = !do_switch; | |
1786 | release_console_sem(); | |
1787 | } | |
1788 | EXPORT_SYMBOL(pm_set_vt_switch); |