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1 | /* |
2 | * Copyright (C) 1992 obz under the linux copyright |
3 | * |
4 | * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993 |
5 | * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994 |
6 | * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995 |
7 | * Some code moved for less code duplication - Andi Kleen - Mar 1997 |
8 | * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001 |
9 | */ |
10 | |
11 | #include <linux/types.h> |
12 | #include <linux/errno.h> |
13 | #include <linux/sched.h> |
14 | #include <linux/tty.h> |
15 | #include <linux/timer.h> |
16 | #include <linux/kernel.h> |
17 | #include <linux/compat.h> |
18 | #include <linux/module.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> |
26 | #include <linux/consolemap.h> |
27 | #include <linux/signal.h> |
28 | #include <linux/suspend.h> |
29 | #include <linux/timex.h> |
30 | |
31 | #include <asm/io.h> |
32 | #include <asm/uaccess.h> |
33 | |
34 | #include <linux/kbd_kern.h> |
35 | #include <linux/vt_kern.h> |
36 | #include <linux/kbd_diacr.h> |
37 | #include <linux/selection.h> |
38 | |
39 | char vt_dont_switch; |
40 | extern struct tty_driver *console_driver; |
41 | |
42 | #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count) |
43 | #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons) |
44 | |
45 | /* |
46 | * Console (vt and kd) routines, as defined by USL SVR4 manual, and by |
47 | * experimentation and study of X386 SYSV handling. |
48 | * |
49 | * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and |
50 | * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console, |
51 | * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will |
52 | * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to |
53 | * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using |
54 | * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing |
55 | * to the current console is done by the main ioctl code. |
56 | */ |
57 | |
58 | #ifdef CONFIG_X86 |
59 | #include <linux/syscalls.h> |
60 | #endif |
61 | |
62 | static void complete_change_console(struct vc_data *vc); |
63 | |
64 | /* |
65 | * User space VT_EVENT handlers |
66 | */ |
67 | |
68 | struct vt_event_wait { |
69 | struct list_head list; |
70 | struct vt_event event; |
71 | int done; |
72 | }; |
73 | |
74 | static LIST_HEAD(vt_events); |
75 | static DEFINE_SPINLOCK(vt_event_lock); |
76 | static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue); |
77 | |
78 | /** |
79 | * vt_event_post |
80 | * @event: the event that occurred |
81 | * @old: old console |
82 | * @new: new console |
83 | * |
84 | * Post an VT event to interested VT handlers |
85 | */ |
86 | |
87 | void vt_event_post(unsigned int event, unsigned int old, unsigned int new) |
88 | { |
89 | struct list_head *pos, *head; |
90 | unsigned long flags; |
91 | int wake = 0; |
92 | |
93 | spin_lock_irqsave(&vt_event_lock, flags); |
94 | head = &vt_events; |
95 | |
96 | list_for_each(pos, head) { |
97 | struct vt_event_wait *ve = list_entry(pos, |
98 | struct vt_event_wait, list); |
99 | if (!(ve->event.event & event)) |
100 | continue; |
101 | ve->event.event = event; |
102 | /* kernel view is consoles 0..n-1, user space view is |
103 | console 1..n with 0 meaning current, so we must bias */ |
104 | ve->event.oldev = old + 1; |
105 | ve->event.newev = new + 1; |
106 | wake = 1; |
107 | ve->done = 1; |
108 | } |
109 | spin_unlock_irqrestore(&vt_event_lock, flags); |
110 | if (wake) |
111 | wake_up_interruptible(&vt_event_waitqueue); |
112 | } |
113 | |
114 | static void __vt_event_queue(struct vt_event_wait *vw) |
115 | { |
116 | unsigned long flags; |
117 | /* Prepare the event */ |
118 | INIT_LIST_HEAD(&vw->list); |
119 | vw->done = 0; |
120 | /* Queue our event */ |
121 | spin_lock_irqsave(&vt_event_lock, flags); |
122 | list_add(&vw->list, &vt_events); |
123 | spin_unlock_irqrestore(&vt_event_lock, flags); |
124 | } |
125 | |
126 | static void __vt_event_wait(struct vt_event_wait *vw) |
127 | { |
128 | /* Wait for it to pass */ |
129 | wait_event_interruptible(vt_event_waitqueue, vw->done); |
130 | } |
131 | |
132 | static void __vt_event_dequeue(struct vt_event_wait *vw) |
133 | { |
134 | unsigned long flags; |
135 | |
136 | /* Dequeue it */ |
137 | spin_lock_irqsave(&vt_event_lock, flags); |
138 | list_del(&vw->list); |
139 | spin_unlock_irqrestore(&vt_event_lock, flags); |
140 | } |
141 | |
142 | /** |
143 | * vt_event_wait - wait for an event |
144 | * @vw: our event |
145 | * |
146 | * Waits for an event to occur which completes our vt_event_wait |
147 | * structure. On return the structure has wv->done set to 1 for success |
148 | * or 0 if some event such as a signal ended the wait. |
149 | */ |
150 | |
151 | static void vt_event_wait(struct vt_event_wait *vw) |
152 | { |
153 | __vt_event_queue(vw); |
154 | __vt_event_wait(vw); |
155 | __vt_event_dequeue(vw); |
156 | } |
157 | |
158 | /** |
159 | * vt_event_wait_ioctl - event ioctl handler |
160 | * @arg: argument to ioctl |
161 | * |
162 | * Implement the VT_WAITEVENT ioctl using the VT event interface |
163 | */ |
164 | |
165 | static int vt_event_wait_ioctl(struct vt_event __user *event) |
166 | { |
167 | struct vt_event_wait vw; |
168 | |
169 | if (copy_from_user(&vw.event, event, sizeof(struct vt_event))) |
170 | return -EFAULT; |
171 | /* Highest supported event for now */ |
172 | if (vw.event.event & ~VT_MAX_EVENT) |
173 | return -EINVAL; |
174 | |
175 | vt_event_wait(&vw); |
176 | /* If it occurred report it */ |
177 | if (vw.done) { |
178 | if (copy_to_user(event, &vw.event, sizeof(struct vt_event))) |
179 | return -EFAULT; |
180 | return 0; |
181 | } |
182 | return -EINTR; |
183 | } |
184 | |
185 | /** |
186 | * vt_waitactive - active console wait |
187 | * @event: event code |
188 | * @n: new console |
189 | * |
190 | * Helper for event waits. Used to implement the legacy |
191 | * event waiting ioctls in terms of events |
192 | */ |
193 | |
194 | int vt_waitactive(int n) |
195 | { |
196 | struct vt_event_wait vw; |
197 | do { |
198 | vw.event.event = VT_EVENT_SWITCH; |
199 | __vt_event_queue(&vw); |
200 | if (n == fg_console + 1) { |
201 | __vt_event_dequeue(&vw); |
202 | break; |
203 | } |
204 | __vt_event_wait(&vw); |
205 | __vt_event_dequeue(&vw); |
206 | if (vw.done == 0) |
207 | return -EINTR; |
208 | } while (vw.event.newev != n); |
209 | return 0; |
210 | } |
211 | |
212 | /* |
213 | * these are the valid i/o ports we're allowed to change. they map all the |
214 | * video ports |
215 | */ |
216 | #define GPFIRST 0x3b4 |
217 | #define GPLAST 0x3df |
218 | #define GPNUM (GPLAST - GPFIRST + 1) |
219 | |
220 | |
221 | |
222 | static inline int |
223 | do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op) |
224 | { |
225 | struct consolefontdesc cfdarg; |
226 | int i; |
227 | |
228 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) |
229 | return -EFAULT; |
230 | |
231 | switch (cmd) { |
232 | case PIO_FONTX: |
233 | if (!perm) |
234 | return -EPERM; |
235 | op->op = KD_FONT_OP_SET; |
236 | op->flags = KD_FONT_FLAG_OLD; |
237 | op->width = 8; |
238 | op->height = cfdarg.charheight; |
239 | op->charcount = cfdarg.charcount; |
240 | op->data = cfdarg.chardata; |
241 | return con_font_op(vc_cons[fg_console].d, op); |
242 | case GIO_FONTX: { |
243 | op->op = KD_FONT_OP_GET; |
244 | op->flags = KD_FONT_FLAG_OLD; |
245 | op->width = 8; |
246 | op->height = cfdarg.charheight; |
247 | op->charcount = cfdarg.charcount; |
248 | op->data = cfdarg.chardata; |
249 | i = con_font_op(vc_cons[fg_console].d, op); |
250 | if (i) |
251 | return i; |
252 | cfdarg.charheight = op->height; |
253 | cfdarg.charcount = op->charcount; |
254 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) |
255 | return -EFAULT; |
256 | return 0; |
257 | } |
258 | } |
259 | return -EINVAL; |
260 | } |
261 | |
262 | static inline int |
263 | do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) |
264 | { |
265 | struct unimapdesc tmp; |
266 | |
267 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) |
268 | return -EFAULT; |
269 | if (tmp.entries) |
270 | if (!access_ok(VERIFY_WRITE, tmp.entries, |
271 | tmp.entry_ct*sizeof(struct unipair))) |
272 | return -EFAULT; |
273 | switch (cmd) { |
274 | case PIO_UNIMAP: |
275 | if (!perm) |
276 | return -EPERM; |
277 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); |
278 | case GIO_UNIMAP: |
279 | if (!perm && fg_console != vc->vc_num) |
280 | return -EPERM; |
281 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries); |
282 | } |
283 | return 0; |
284 | } |
285 | |
286 | |
287 | |
288 | /* |
289 | * We handle the console-specific ioctl's here. We allow the |
290 | * capability to modify any console, not just the fg_console. |
291 | */ |
292 | int vt_ioctl(struct tty_struct *tty, |
293 | unsigned int cmd, unsigned long arg) |
294 | { |
295 | struct vc_data *vc = tty->driver_data; |
296 | struct console_font_op op; /* used in multiple places here */ |
297 | unsigned int console; |
298 | unsigned char ucval; |
299 | unsigned int uival; |
300 | void __user *up = (void __user *)arg; |
301 | int i, perm; |
302 | int ret = 0; |
303 | |
304 | console = vc->vc_num; |
305 | |
306 | |
307 | if (!vc_cons_allocated(console)) { /* impossible? */ |
308 | ret = -ENOIOCTLCMD; |
309 | goto out; |
310 | } |
311 | |
312 | |
313 | /* |
314 | * To have permissions to do most of the vt ioctls, we either have |
315 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. |
316 | */ |
317 | perm = 0; |
318 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) |
319 | perm = 1; |
320 | |
321 | switch (cmd) { |
322 | case TIOCLINUX: |
323 | ret = tioclinux(tty, arg); |
324 | break; |
325 | case KIOCSOUND: |
326 | if (!perm) |
327 | return -EPERM; |
328 | /* |
329 | * The use of PIT_TICK_RATE is historic, it used to be |
330 | * the platform-dependent CLOCK_TICK_RATE between 2.6.12 |
331 | * and 2.6.36, which was a minor but unfortunate ABI |
332 | * change. kd_mksound is locked by the input layer. |
333 | */ |
334 | if (arg) |
335 | arg = PIT_TICK_RATE / arg; |
336 | kd_mksound(arg, 0); |
337 | break; |
338 | |
339 | case KDMKTONE: |
340 | if (!perm) |
341 | return -EPERM; |
342 | { |
343 | unsigned int ticks, count; |
344 | |
345 | /* |
346 | * Generate the tone for the appropriate number of ticks. |
347 | * If the time is zero, turn off sound ourselves. |
348 | */ |
349 | ticks = HZ * ((arg >> 16) & 0xffff) / 1000; |
350 | count = ticks ? (arg & 0xffff) : 0; |
351 | if (count) |
352 | count = PIT_TICK_RATE / count; |
353 | kd_mksound(count, ticks); |
354 | break; |
355 | } |
356 | |
357 | case KDGKBTYPE: |
358 | /* |
359 | * this is naïve. |
360 | */ |
361 | ucval = KB_101; |
362 | ret = put_user(ucval, (char __user *)arg); |
363 | break; |
364 | |
365 | /* |
366 | * These cannot be implemented on any machine that implements |
367 | * ioperm() in user level (such as Alpha PCs) or not at all. |
368 | * |
369 | * XXX: you should never use these, just call ioperm directly.. |
370 | */ |
371 | #ifdef CONFIG_X86 |
372 | case KDADDIO: |
373 | case KDDELIO: |
374 | /* |
375 | * KDADDIO and KDDELIO may be able to add ports beyond what |
376 | * we reject here, but to be safe... |
377 | * |
378 | * These are locked internally via sys_ioperm |
379 | */ |
380 | if (arg < GPFIRST || arg > GPLAST) { |
381 | ret = -EINVAL; |
382 | break; |
383 | } |
384 | ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; |
385 | break; |
386 | |
387 | case KDENABIO: |
388 | case KDDISABIO: |
389 | ret = sys_ioperm(GPFIRST, GPNUM, |
390 | (cmd == KDENABIO)) ? -ENXIO : 0; |
391 | break; |
392 | #endif |
393 | |
394 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ |
395 | |
396 | case KDKBDREP: |
397 | { |
398 | struct kbd_repeat kbrep; |
399 | |
400 | if (!capable(CAP_SYS_TTY_CONFIG)) |
401 | return -EPERM; |
402 | |
403 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) { |
404 | ret = -EFAULT; |
405 | break; |
406 | } |
407 | ret = kbd_rate(&kbrep); |
408 | if (ret) |
409 | break; |
410 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) |
411 | ret = -EFAULT; |
412 | break; |
413 | } |
414 | |
415 | case KDSETMODE: |
416 | /* |
417 | * currently, setting the mode from KD_TEXT to KD_GRAPHICS |
418 | * doesn't do a whole lot. i'm not sure if it should do any |
419 | * restoration of modes or what... |
420 | * |
421 | * XXX It should at least call into the driver, fbdev's definitely |
422 | * need to restore their engine state. --BenH |
423 | */ |
424 | if (!perm) |
425 | return -EPERM; |
426 | switch (arg) { |
427 | case KD_GRAPHICS: |
428 | break; |
429 | case KD_TEXT0: |
430 | case KD_TEXT1: |
431 | arg = KD_TEXT; |
432 | case KD_TEXT: |
433 | break; |
434 | default: |
435 | ret = -EINVAL; |
436 | goto out; |
437 | } |
438 | /* FIXME: this needs the console lock extending */ |
439 | if (vc->vc_mode == (unsigned char) arg) |
440 | break; |
441 | vc->vc_mode = (unsigned char) arg; |
442 | if (console != fg_console) |
443 | break; |
444 | /* |
445 | * explicitly blank/unblank the screen if switching modes |
446 | */ |
447 | console_lock(); |
448 | if (arg == KD_TEXT) |
449 | do_unblank_screen(1); |
450 | else |
451 | do_blank_screen(1); |
452 | console_unlock(); |
453 | break; |
454 | |
455 | case KDGETMODE: |
456 | uival = vc->vc_mode; |
457 | goto setint; |
458 | |
459 | case KDMAPDISP: |
460 | case KDUNMAPDISP: |
461 | /* |
462 | * these work like a combination of mmap and KDENABIO. |
463 | * this could be easily finished. |
464 | */ |
465 | ret = -EINVAL; |
466 | break; |
467 | |
468 | case KDSKBMODE: |
469 | if (!perm) |
470 | return -EPERM; |
471 | ret = vt_do_kdskbmode(console, arg); |
472 | if (ret == 0) |
473 | tty_ldisc_flush(tty); |
474 | break; |
475 | |
476 | case KDGKBMODE: |
477 | uival = vt_do_kdgkbmode(console); |
478 | ret = put_user(uival, (int __user *)arg); |
479 | break; |
480 | |
481 | /* this could be folded into KDSKBMODE, but for compatibility |
482 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ |
483 | case KDSKBMETA: |
484 | ret = vt_do_kdskbmeta(console, arg); |
485 | break; |
486 | |
487 | case KDGKBMETA: |
488 | /* FIXME: should review whether this is worth locking */ |
489 | uival = vt_do_kdgkbmeta(console); |
490 | setint: |
491 | ret = put_user(uival, (int __user *)arg); |
492 | break; |
493 | |
494 | case KDGETKEYCODE: |
495 | case KDSETKEYCODE: |
496 | if(!capable(CAP_SYS_TTY_CONFIG)) |
497 | perm = 0; |
498 | ret = vt_do_kbkeycode_ioctl(cmd, up, perm); |
499 | break; |
500 | |
501 | case KDGKBENT: |
502 | case KDSKBENT: |
503 | ret = vt_do_kdsk_ioctl(cmd, up, perm, console); |
504 | break; |
505 | |
506 | case KDGKBSENT: |
507 | case KDSKBSENT: |
508 | ret = vt_do_kdgkb_ioctl(cmd, up, perm); |
509 | break; |
510 | |
511 | /* Diacritical processing. Handled in keyboard.c as it has |
512 | to operate on the keyboard locks and structures */ |
513 | case KDGKBDIACR: |
514 | case KDGKBDIACRUC: |
515 | case KDSKBDIACR: |
516 | case KDSKBDIACRUC: |
517 | ret = vt_do_diacrit(cmd, up, perm); |
518 | break; |
519 | |
520 | /* the ioctls below read/set the flags usually shown in the leds */ |
521 | /* don't use them - they will go away without warning */ |
522 | case KDGKBLED: |
523 | case KDSKBLED: |
524 | case KDGETLED: |
525 | case KDSETLED: |
526 | ret = vt_do_kdskled(console, cmd, arg, perm); |
527 | break; |
528 | |
529 | /* |
530 | * A process can indicate its willingness to accept signals |
531 | * generated by pressing an appropriate key combination. |
532 | * Thus, one can have a daemon that e.g. spawns a new console |
533 | * upon a keypress and then changes to it. |
534 | * See also the kbrequest field of inittab(5). |
535 | */ |
536 | case KDSIGACCEPT: |
537 | { |
538 | if (!perm || !capable(CAP_KILL)) |
539 | return -EPERM; |
540 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
541 | ret = -EINVAL; |
542 | else { |
543 | spin_lock_irq(&vt_spawn_con.lock); |
544 | put_pid(vt_spawn_con.pid); |
545 | vt_spawn_con.pid = get_pid(task_pid(current)); |
546 | vt_spawn_con.sig = arg; |
547 | spin_unlock_irq(&vt_spawn_con.lock); |
548 | } |
549 | break; |
550 | } |
551 | |
552 | case VT_SETMODE: |
553 | { |
554 | struct vt_mode tmp; |
555 | |
556 | if (!perm) |
557 | return -EPERM; |
558 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) { |
559 | ret = -EFAULT; |
560 | goto out; |
561 | } |
562 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) { |
563 | ret = -EINVAL; |
564 | goto out; |
565 | } |
566 | console_lock(); |
567 | vc->vt_mode = tmp; |
568 | /* the frsig is ignored, so we set it to 0 */ |
569 | vc->vt_mode.frsig = 0; |
570 | put_pid(vc->vt_pid); |
571 | vc->vt_pid = get_pid(task_pid(current)); |
572 | /* no switch is required -- saw@shade.msu.ru */ |
573 | vc->vt_newvt = -1; |
574 | console_unlock(); |
575 | break; |
576 | } |
577 | |
578 | case VT_GETMODE: |
579 | { |
580 | struct vt_mode tmp; |
581 | int rc; |
582 | |
583 | console_lock(); |
584 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); |
585 | console_unlock(); |
586 | |
587 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); |
588 | if (rc) |
589 | ret = -EFAULT; |
590 | break; |
591 | } |
592 | |
593 | /* |
594 | * Returns global vt state. Note that VT 0 is always open, since |
595 | * it's an alias for the current VT, and people can't use it here. |
596 | * We cannot return state for more than 16 VTs, since v_state is short. |
597 | */ |
598 | case VT_GETSTATE: |
599 | { |
600 | struct vt_stat __user *vtstat = up; |
601 | unsigned short state, mask; |
602 | |
603 | /* Review: FIXME: Console lock ? */ |
604 | if (put_user(fg_console + 1, &vtstat->v_active)) |
605 | ret = -EFAULT; |
606 | else { |
607 | state = 1; /* /dev/tty0 is always open */ |
608 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; |
609 | ++i, mask <<= 1) |
610 | if (VT_IS_IN_USE(i)) |
611 | state |= mask; |
612 | ret = put_user(state, &vtstat->v_state); |
613 | } |
614 | break; |
615 | } |
616 | |
617 | /* |
618 | * Returns the first available (non-opened) console. |
619 | */ |
620 | case VT_OPENQRY: |
621 | /* FIXME: locking ? - but then this is a stupid API */ |
622 | for (i = 0; i < MAX_NR_CONSOLES; ++i) |
623 | if (! VT_IS_IN_USE(i)) |
624 | break; |
625 | uival = i < MAX_NR_CONSOLES ? (i+1) : -1; |
626 | goto setint; |
627 | |
628 | /* |
629 | * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, |
630 | * with num >= 1 (switches to vt 0, our console, are not allowed, just |
631 | * to preserve sanity). |
632 | */ |
633 | case VT_ACTIVATE: |
634 | if (!perm) |
635 | return -EPERM; |
636 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
637 | ret = -ENXIO; |
638 | else { |
639 | arg--; |
640 | console_lock(); |
641 | ret = vc_allocate(arg); |
642 | console_unlock(); |
643 | if (ret) |
644 | break; |
645 | set_console(arg); |
646 | } |
647 | break; |
648 | |
649 | case VT_SETACTIVATE: |
650 | { |
651 | struct vt_setactivate vsa; |
652 | |
653 | if (!perm) |
654 | return -EPERM; |
655 | |
656 | if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg, |
657 | sizeof(struct vt_setactivate))) { |
658 | ret = -EFAULT; |
659 | goto out; |
660 | } |
661 | if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES) |
662 | ret = -ENXIO; |
663 | else { |
664 | vsa.console--; |
665 | console_lock(); |
666 | ret = vc_allocate(vsa.console); |
667 | if (ret == 0) { |
668 | struct vc_data *nvc; |
669 | /* This is safe providing we don't drop the |
670 | console sem between vc_allocate and |
671 | finishing referencing nvc */ |
672 | nvc = vc_cons[vsa.console].d; |
673 | nvc->vt_mode = vsa.mode; |
674 | nvc->vt_mode.frsig = 0; |
675 | put_pid(nvc->vt_pid); |
676 | nvc->vt_pid = get_pid(task_pid(current)); |
677 | } |
678 | console_unlock(); |
679 | if (ret) |
680 | break; |
681 | /* Commence switch and lock */ |
682 | /* Review set_console locks */ |
683 | set_console(vsa.console); |
684 | } |
685 | break; |
686 | } |
687 | |
688 | /* |
689 | * wait until the specified VT has been activated |
690 | */ |
691 | case VT_WAITACTIVE: |
692 | if (!perm) |
693 | return -EPERM; |
694 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
695 | ret = -ENXIO; |
696 | else |
697 | ret = vt_waitactive(arg); |
698 | break; |
699 | |
700 | /* |
701 | * If a vt is under process control, the kernel will not switch to it |
702 | * immediately, but postpone the operation until the process calls this |
703 | * ioctl, allowing the switch to complete. |
704 | * |
705 | * According to the X sources this is the behavior: |
706 | * 0: pending switch-from not OK |
707 | * 1: pending switch-from OK |
708 | * 2: completed switch-to OK |
709 | */ |
710 | case VT_RELDISP: |
711 | if (!perm) |
712 | return -EPERM; |
713 | |
714 | console_lock(); |
715 | if (vc->vt_mode.mode != VT_PROCESS) { |
716 | console_unlock(); |
717 | ret = -EINVAL; |
718 | break; |
719 | } |
720 | /* |
721 | * Switching-from response |
722 | */ |
723 | if (vc->vt_newvt >= 0) { |
724 | if (arg == 0) |
725 | /* |
726 | * Switch disallowed, so forget we were trying |
727 | * to do it. |
728 | */ |
729 | vc->vt_newvt = -1; |
730 | |
731 | else { |
732 | /* |
733 | * The current vt has been released, so |
734 | * complete the switch. |
735 | */ |
736 | int newvt; |
737 | newvt = vc->vt_newvt; |
738 | vc->vt_newvt = -1; |
739 | ret = vc_allocate(newvt); |
740 | if (ret) { |
741 | console_unlock(); |
742 | break; |
743 | } |
744 | /* |
745 | * When we actually do the console switch, |
746 | * make sure we are atomic with respect to |
747 | * other console switches.. |
748 | */ |
749 | complete_change_console(vc_cons[newvt].d); |
750 | } |
751 | } else { |
752 | /* |
753 | * Switched-to response |
754 | */ |
755 | /* |
756 | * If it's just an ACK, ignore it |
757 | */ |
758 | if (arg != VT_ACKACQ) |
759 | ret = -EINVAL; |
760 | } |
761 | console_unlock(); |
762 | break; |
763 | |
764 | /* |
765 | * Disallocate memory associated to VT (but leave VT1) |
766 | */ |
767 | case VT_DISALLOCATE: |
768 | if (arg > MAX_NR_CONSOLES) { |
769 | ret = -ENXIO; |
770 | break; |
771 | } |
772 | if (arg == 0) { |
773 | /* deallocate all unused consoles, but leave 0 */ |
774 | console_lock(); |
775 | for (i=1; i<MAX_NR_CONSOLES; i++) |
776 | if (! VT_BUSY(i)) |
777 | vc_deallocate(i); |
778 | console_unlock(); |
779 | } else { |
780 | /* deallocate a single console, if possible */ |
781 | arg--; |
782 | if (VT_BUSY(arg)) |
783 | ret = -EBUSY; |
784 | else if (arg) { /* leave 0 */ |
785 | console_lock(); |
786 | vc_deallocate(arg); |
787 | console_unlock(); |
788 | } |
789 | } |
790 | break; |
791 | |
792 | case VT_RESIZE: |
793 | { |
794 | struct vt_sizes __user *vtsizes = up; |
795 | struct vc_data *vc; |
796 | |
797 | ushort ll,cc; |
798 | if (!perm) |
799 | return -EPERM; |
800 | if (get_user(ll, &vtsizes->v_rows) || |
801 | get_user(cc, &vtsizes->v_cols)) |
802 | ret = -EFAULT; |
803 | else { |
804 | console_lock(); |
805 | for (i = 0; i < MAX_NR_CONSOLES; i++) { |
806 | vc = vc_cons[i].d; |
807 | |
808 | if (vc) { |
809 | vc->vc_resize_user = 1; |
810 | /* FIXME: review v tty lock */ |
811 | vc_resize(vc_cons[i].d, cc, ll); |
812 | } |
813 | } |
814 | console_unlock(); |
815 | } |
816 | break; |
817 | } |
818 | |
819 | case VT_RESIZEX: |
820 | { |
821 | struct vt_consize __user *vtconsize = up; |
822 | ushort ll,cc,vlin,clin,vcol,ccol; |
823 | if (!perm) |
824 | return -EPERM; |
825 | if (!access_ok(VERIFY_READ, vtconsize, |
826 | sizeof(struct vt_consize))) { |
827 | ret = -EFAULT; |
828 | break; |
829 | } |
830 | /* FIXME: Should check the copies properly */ |
831 | __get_user(ll, &vtconsize->v_rows); |
832 | __get_user(cc, &vtconsize->v_cols); |
833 | __get_user(vlin, &vtconsize->v_vlin); |
834 | __get_user(clin, &vtconsize->v_clin); |
835 | __get_user(vcol, &vtconsize->v_vcol); |
836 | __get_user(ccol, &vtconsize->v_ccol); |
837 | vlin = vlin ? vlin : vc->vc_scan_lines; |
838 | if (clin) { |
839 | if (ll) { |
840 | if (ll != vlin/clin) { |
841 | /* Parameters don't add up */ |
842 | ret = -EINVAL; |
843 | break; |
844 | } |
845 | } else |
846 | ll = vlin/clin; |
847 | } |
848 | if (vcol && ccol) { |
849 | if (cc) { |
850 | if (cc != vcol/ccol) { |
851 | ret = -EINVAL; |
852 | break; |
853 | } |
854 | } else |
855 | cc = vcol/ccol; |
856 | } |
857 | |
858 | if (clin > 32) { |
859 | ret = -EINVAL; |
860 | break; |
861 | } |
862 | |
863 | for (i = 0; i < MAX_NR_CONSOLES; i++) { |
864 | if (!vc_cons[i].d) |
865 | continue; |
866 | console_lock(); |
867 | if (vlin) |
868 | vc_cons[i].d->vc_scan_lines = vlin; |
869 | if (clin) |
870 | vc_cons[i].d->vc_font.height = clin; |
871 | vc_cons[i].d->vc_resize_user = 1; |
872 | vc_resize(vc_cons[i].d, cc, ll); |
873 | console_unlock(); |
874 | } |
875 | break; |
876 | } |
877 | |
878 | case PIO_FONT: { |
879 | if (!perm) |
880 | return -EPERM; |
881 | op.op = KD_FONT_OP_SET; |
882 | op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ |
883 | op.width = 8; |
884 | op.height = 0; |
885 | op.charcount = 256; |
886 | op.data = up; |
887 | ret = con_font_op(vc_cons[fg_console].d, &op); |
888 | break; |
889 | } |
890 | |
891 | case GIO_FONT: { |
892 | op.op = KD_FONT_OP_GET; |
893 | op.flags = KD_FONT_FLAG_OLD; |
894 | op.width = 8; |
895 | op.height = 32; |
896 | op.charcount = 256; |
897 | op.data = up; |
898 | ret = con_font_op(vc_cons[fg_console].d, &op); |
899 | break; |
900 | } |
901 | |
902 | case PIO_CMAP: |
903 | if (!perm) |
904 | ret = -EPERM; |
905 | else |
906 | ret = con_set_cmap(up); |
907 | break; |
908 | |
909 | case GIO_CMAP: |
910 | ret = con_get_cmap(up); |
911 | break; |
912 | |
913 | case PIO_FONTX: |
914 | case GIO_FONTX: |
915 | ret = do_fontx_ioctl(cmd, up, perm, &op); |
916 | break; |
917 | |
918 | case PIO_FONTRESET: |
919 | { |
920 | if (!perm) |
921 | return -EPERM; |
922 | |
923 | #ifdef BROKEN_GRAPHICS_PROGRAMS |
924 | /* With BROKEN_GRAPHICS_PROGRAMS defined, the default |
925 | font is not saved. */ |
926 | ret = -ENOSYS; |
927 | break; |
928 | #else |
929 | { |
930 | op.op = KD_FONT_OP_SET_DEFAULT; |
931 | op.data = NULL; |
932 | ret = con_font_op(vc_cons[fg_console].d, &op); |
933 | if (ret) |
934 | break; |
935 | console_lock(); |
936 | con_set_default_unimap(vc_cons[fg_console].d); |
937 | console_unlock(); |
938 | break; |
939 | } |
940 | #endif |
941 | } |
942 | |
943 | case KDFONTOP: { |
944 | if (copy_from_user(&op, up, sizeof(op))) { |
945 | ret = -EFAULT; |
946 | break; |
947 | } |
948 | if (!perm && op.op != KD_FONT_OP_GET) |
949 | return -EPERM; |
950 | ret = con_font_op(vc, &op); |
951 | if (ret) |
952 | break; |
953 | if (copy_to_user(up, &op, sizeof(op))) |
954 | ret = -EFAULT; |
955 | break; |
956 | } |
957 | |
958 | case PIO_SCRNMAP: |
959 | if (!perm) |
960 | ret = -EPERM; |
961 | else |
962 | ret = con_set_trans_old(up); |
963 | break; |
964 | |
965 | case GIO_SCRNMAP: |
966 | ret = con_get_trans_old(up); |
967 | break; |
968 | |
969 | case PIO_UNISCRNMAP: |
970 | if (!perm) |
971 | ret = -EPERM; |
972 | else |
973 | ret = con_set_trans_new(up); |
974 | break; |
975 | |
976 | case GIO_UNISCRNMAP: |
977 | ret = con_get_trans_new(up); |
978 | break; |
979 | |
980 | case PIO_UNIMAPCLR: |
981 | { struct unimapinit ui; |
982 | if (!perm) |
983 | return -EPERM; |
984 | ret = copy_from_user(&ui, up, sizeof(struct unimapinit)); |
985 | if (ret) |
986 | ret = -EFAULT; |
987 | else |
988 | con_clear_unimap(vc, &ui); |
989 | break; |
990 | } |
991 | |
992 | case PIO_UNIMAP: |
993 | case GIO_UNIMAP: |
994 | ret = do_unimap_ioctl(cmd, up, perm, vc); |
995 | break; |
996 | |
997 | case VT_LOCKSWITCH: |
998 | if (!capable(CAP_SYS_TTY_CONFIG)) |
999 | return -EPERM; |
1000 | vt_dont_switch = 1; |
1001 | break; |
1002 | case VT_UNLOCKSWITCH: |
1003 | if (!capable(CAP_SYS_TTY_CONFIG)) |
1004 | return -EPERM; |
1005 | vt_dont_switch = 0; |
1006 | break; |
1007 | case VT_GETHIFONTMASK: |
1008 | ret = put_user(vc->vc_hi_font_mask, |
1009 | (unsigned short __user *)arg); |
1010 | break; |
1011 | case VT_WAITEVENT: |
1012 | ret = vt_event_wait_ioctl((struct vt_event __user *)arg); |
1013 | break; |
1014 | default: |
1015 | ret = -ENOIOCTLCMD; |
1016 | } |
1017 | out: |
1018 | return ret; |
1019 | } |
1020 | |
1021 | void reset_vc(struct vc_data *vc) |
1022 | { |
1023 | vc->vc_mode = KD_TEXT; |
1024 | vt_reset_unicode(vc->vc_num); |
1025 | vc->vt_mode.mode = VT_AUTO; |
1026 | vc->vt_mode.waitv = 0; |
1027 | vc->vt_mode.relsig = 0; |
1028 | vc->vt_mode.acqsig = 0; |
1029 | vc->vt_mode.frsig = 0; |
1030 | put_pid(vc->vt_pid); |
1031 | vc->vt_pid = NULL; |
1032 | vc->vt_newvt = -1; |
1033 | if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ |
1034 | reset_palette(vc); |
1035 | } |
1036 | |
1037 | void vc_SAK(struct work_struct *work) |
1038 | { |
1039 | struct vc *vc_con = |
1040 | container_of(work, struct vc, SAK_work); |
1041 | struct vc_data *vc; |
1042 | struct tty_struct *tty; |
1043 | |
1044 | console_lock(); |
1045 | vc = vc_con->d; |
1046 | if (vc) { |
1047 | /* FIXME: review tty ref counting */ |
1048 | tty = vc->port.tty; |
1049 | /* |
1050 | * SAK should also work in all raw modes and reset |
1051 | * them properly. |
1052 | */ |
1053 | if (tty) |
1054 | __do_SAK(tty); |
1055 | reset_vc(vc); |
1056 | } |
1057 | console_unlock(); |
1058 | } |
1059 | |
1060 | #ifdef CONFIG_COMPAT |
1061 | |
1062 | struct compat_consolefontdesc { |
1063 | unsigned short charcount; /* characters in font (256 or 512) */ |
1064 | unsigned short charheight; /* scan lines per character (1-32) */ |
1065 | compat_caddr_t chardata; /* font data in expanded form */ |
1066 | }; |
1067 | |
1068 | static inline int |
1069 | compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd, |
1070 | int perm, struct console_font_op *op) |
1071 | { |
1072 | struct compat_consolefontdesc cfdarg; |
1073 | int i; |
1074 | |
1075 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc))) |
1076 | return -EFAULT; |
1077 | |
1078 | switch (cmd) { |
1079 | case PIO_FONTX: |
1080 | if (!perm) |
1081 | return -EPERM; |
1082 | op->op = KD_FONT_OP_SET; |
1083 | op->flags = KD_FONT_FLAG_OLD; |
1084 | op->width = 8; |
1085 | op->height = cfdarg.charheight; |
1086 | op->charcount = cfdarg.charcount; |
1087 | op->data = compat_ptr(cfdarg.chardata); |
1088 | return con_font_op(vc_cons[fg_console].d, op); |
1089 | case GIO_FONTX: |
1090 | op->op = KD_FONT_OP_GET; |
1091 | op->flags = KD_FONT_FLAG_OLD; |
1092 | op->width = 8; |
1093 | op->height = cfdarg.charheight; |
1094 | op->charcount = cfdarg.charcount; |
1095 | op->data = compat_ptr(cfdarg.chardata); |
1096 | i = con_font_op(vc_cons[fg_console].d, op); |
1097 | if (i) |
1098 | return i; |
1099 | cfdarg.charheight = op->height; |
1100 | cfdarg.charcount = op->charcount; |
1101 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc))) |
1102 | return -EFAULT; |
1103 | return 0; |
1104 | } |
1105 | return -EINVAL; |
1106 | } |
1107 | |
1108 | struct compat_console_font_op { |
1109 | compat_uint_t op; /* operation code KD_FONT_OP_* */ |
1110 | compat_uint_t flags; /* KD_FONT_FLAG_* */ |
1111 | compat_uint_t width, height; /* font size */ |
1112 | compat_uint_t charcount; |
1113 | compat_caddr_t data; /* font data with height fixed to 32 */ |
1114 | }; |
1115 | |
1116 | static inline int |
1117 | compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop, |
1118 | int perm, struct console_font_op *op, struct vc_data *vc) |
1119 | { |
1120 | int i; |
1121 | |
1122 | if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op))) |
1123 | return -EFAULT; |
1124 | if (!perm && op->op != KD_FONT_OP_GET) |
1125 | return -EPERM; |
1126 | op->data = compat_ptr(((struct compat_console_font_op *)op)->data); |
1127 | i = con_font_op(vc, op); |
1128 | if (i) |
1129 | return i; |
1130 | ((struct compat_console_font_op *)op)->data = (unsigned long)op->data; |
1131 | if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op))) |
1132 | return -EFAULT; |
1133 | return 0; |
1134 | } |
1135 | |
1136 | struct compat_unimapdesc { |
1137 | unsigned short entry_ct; |
1138 | compat_caddr_t entries; |
1139 | }; |
1140 | |
1141 | static inline int |
1142 | compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud, |
1143 | int perm, struct vc_data *vc) |
1144 | { |
1145 | struct compat_unimapdesc tmp; |
1146 | struct unipair __user *tmp_entries; |
1147 | |
1148 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) |
1149 | return -EFAULT; |
1150 | tmp_entries = compat_ptr(tmp.entries); |
1151 | if (tmp_entries) |
1152 | if (!access_ok(VERIFY_WRITE, tmp_entries, |
1153 | tmp.entry_ct*sizeof(struct unipair))) |
1154 | return -EFAULT; |
1155 | switch (cmd) { |
1156 | case PIO_UNIMAP: |
1157 | if (!perm) |
1158 | return -EPERM; |
1159 | return con_set_unimap(vc, tmp.entry_ct, tmp_entries); |
1160 | case GIO_UNIMAP: |
1161 | if (!perm && fg_console != vc->vc_num) |
1162 | return -EPERM; |
1163 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries); |
1164 | } |
1165 | return 0; |
1166 | } |
1167 | |
1168 | long vt_compat_ioctl(struct tty_struct *tty, |
1169 | unsigned int cmd, unsigned long arg) |
1170 | { |
1171 | struct vc_data *vc = tty->driver_data; |
1172 | struct console_font_op op; /* used in multiple places here */ |
1173 | unsigned int console; |
1174 | void __user *up = (void __user *)arg; |
1175 | int perm; |
1176 | int ret = 0; |
1177 | |
1178 | console = vc->vc_num; |
1179 | |
1180 | if (!vc_cons_allocated(console)) { /* impossible? */ |
1181 | ret = -ENOIOCTLCMD; |
1182 | goto out; |
1183 | } |
1184 | |
1185 | /* |
1186 | * To have permissions to do most of the vt ioctls, we either have |
1187 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. |
1188 | */ |
1189 | perm = 0; |
1190 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) |
1191 | perm = 1; |
1192 | |
1193 | switch (cmd) { |
1194 | /* |
1195 | * these need special handlers for incompatible data structures |
1196 | */ |
1197 | case PIO_FONTX: |
1198 | case GIO_FONTX: |
1199 | ret = compat_fontx_ioctl(cmd, up, perm, &op); |
1200 | break; |
1201 | |
1202 | case KDFONTOP: |
1203 | ret = compat_kdfontop_ioctl(up, perm, &op, vc); |
1204 | break; |
1205 | |
1206 | case PIO_UNIMAP: |
1207 | case GIO_UNIMAP: |
1208 | ret = compat_unimap_ioctl(cmd, up, perm, vc); |
1209 | break; |
1210 | |
1211 | /* |
1212 | * all these treat 'arg' as an integer |
1213 | */ |
1214 | case KIOCSOUND: |
1215 | case KDMKTONE: |
1216 | #ifdef CONFIG_X86 |
1217 | case KDADDIO: |
1218 | case KDDELIO: |
1219 | #endif |
1220 | case KDSETMODE: |
1221 | case KDMAPDISP: |
1222 | case KDUNMAPDISP: |
1223 | case KDSKBMODE: |
1224 | case KDSKBMETA: |
1225 | case KDSKBLED: |
1226 | case KDSETLED: |
1227 | case KDSIGACCEPT: |
1228 | case VT_ACTIVATE: |
1229 | case VT_WAITACTIVE: |
1230 | case VT_RELDISP: |
1231 | case VT_DISALLOCATE: |
1232 | case VT_RESIZE: |
1233 | case VT_RESIZEX: |
1234 | goto fallback; |
1235 | |
1236 | /* |
1237 | * the rest has a compatible data structure behind arg, |
1238 | * but we have to convert it to a proper 64 bit pointer. |
1239 | */ |
1240 | default: |
1241 | arg = (unsigned long)compat_ptr(arg); |
1242 | goto fallback; |
1243 | } |
1244 | out: |
1245 | return ret; |
1246 | |
1247 | fallback: |
1248 | return vt_ioctl(tty, cmd, arg); |
1249 | } |
1250 | |
1251 | |
1252 | #endif /* CONFIG_COMPAT */ |
1253 | |
1254 | |
1255 | /* |
1256 | * Performs the back end of a vt switch. Called under the console |
1257 | * semaphore. |
1258 | */ |
1259 | static void complete_change_console(struct vc_data *vc) |
1260 | { |
1261 | unsigned char old_vc_mode; |
1262 | int old = fg_console; |
1263 | |
1264 | last_console = fg_console; |
1265 | |
1266 | /* |
1267 | * If we're switching, we could be going from KD_GRAPHICS to |
1268 | * KD_TEXT mode or vice versa, which means we need to blank or |
1269 | * unblank the screen later. |
1270 | */ |
1271 | old_vc_mode = vc_cons[fg_console].d->vc_mode; |
1272 | switch_screen(vc); |
1273 | |
1274 | /* |
1275 | * This can't appear below a successful kill_pid(). If it did, |
1276 | * then the *blank_screen operation could occur while X, having |
1277 | * received acqsig, is waking up on another processor. This |
1278 | * condition can lead to overlapping accesses to the VGA range |
1279 | * and the framebuffer (causing system lockups). |
1280 | * |
1281 | * To account for this we duplicate this code below only if the |
1282 | * controlling process is gone and we've called reset_vc. |
1283 | */ |
1284 | if (old_vc_mode != vc->vc_mode) { |
1285 | if (vc->vc_mode == KD_TEXT) |
1286 | do_unblank_screen(1); |
1287 | else |
1288 | do_blank_screen(1); |
1289 | } |
1290 | |
1291 | /* |
1292 | * If this new console is under process control, send it a signal |
1293 | * telling it that it has acquired. Also check if it has died and |
1294 | * clean up (similar to logic employed in change_console()) |
1295 | */ |
1296 | if (vc->vt_mode.mode == VT_PROCESS) { |
1297 | /* |
1298 | * Send the signal as privileged - kill_pid() will |
1299 | * tell us if the process has gone or something else |
1300 | * is awry |
1301 | */ |
1302 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
1303 | /* |
1304 | * The controlling process has died, so we revert back to |
1305 | * normal operation. In this case, we'll also change back |
1306 | * to KD_TEXT mode. I'm not sure if this is strictly correct |
1307 | * but it saves the agony when the X server dies and the screen |
1308 | * remains blanked due to KD_GRAPHICS! It would be nice to do |
1309 | * this outside of VT_PROCESS but there is no single process |
1310 | * to account for and tracking tty count may be undesirable. |
1311 | */ |
1312 | reset_vc(vc); |
1313 | |
1314 | if (old_vc_mode != vc->vc_mode) { |
1315 | if (vc->vc_mode == KD_TEXT) |
1316 | do_unblank_screen(1); |
1317 | else |
1318 | do_blank_screen(1); |
1319 | } |
1320 | } |
1321 | } |
1322 | |
1323 | /* |
1324 | * Wake anyone waiting for their VT to activate |
1325 | */ |
1326 | vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num); |
1327 | return; |
1328 | } |
1329 | |
1330 | /* |
1331 | * Performs the front-end of a vt switch |
1332 | */ |
1333 | void change_console(struct vc_data *new_vc) |
1334 | { |
1335 | struct vc_data *vc; |
1336 | |
1337 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) |
1338 | return; |
1339 | |
1340 | /* |
1341 | * If this vt is in process mode, then we need to handshake with |
1342 | * that process before switching. Essentially, we store where that |
1343 | * vt wants to switch to and wait for it to tell us when it's done |
1344 | * (via VT_RELDISP ioctl). |
1345 | * |
1346 | * We also check to see if the controlling process still exists. |
1347 | * If it doesn't, we reset this vt to auto mode and continue. |
1348 | * This is a cheap way to track process control. The worst thing |
1349 | * that can happen is: we send a signal to a process, it dies, and |
1350 | * the switch gets "lost" waiting for a response; hopefully, the |
1351 | * user will try again, we'll detect the process is gone (unless |
1352 | * the user waits just the right amount of time :-) and revert the |
1353 | * vt to auto control. |
1354 | */ |
1355 | vc = vc_cons[fg_console].d; |
1356 | if (vc->vt_mode.mode == VT_PROCESS) { |
1357 | /* |
1358 | * Send the signal as privileged - kill_pid() will |
1359 | * tell us if the process has gone or something else |
1360 | * is awry. |
1361 | * |
1362 | * We need to set vt_newvt *before* sending the signal or we |
1363 | * have a race. |
1364 | */ |
1365 | vc->vt_newvt = new_vc->vc_num; |
1366 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
1367 | /* |
1368 | * It worked. Mark the vt to switch to and |
1369 | * return. The process needs to send us a |
1370 | * VT_RELDISP ioctl to complete the switch. |
1371 | */ |
1372 | return; |
1373 | } |
1374 | |
1375 | /* |
1376 | * The controlling process has died, so we revert back to |
1377 | * normal operation. In this case, we'll also change back |
1378 | * to KD_TEXT mode. I'm not sure if this is strictly correct |
1379 | * but it saves the agony when the X server dies and the screen |
1380 | * remains blanked due to KD_GRAPHICS! It would be nice to do |
1381 | * this outside of VT_PROCESS but there is no single process |
1382 | * to account for and tracking tty count may be undesirable. |
1383 | */ |
1384 | reset_vc(vc); |
1385 | |
1386 | /* |
1387 | * Fall through to normal (VT_AUTO) handling of the switch... |
1388 | */ |
1389 | } |
1390 | |
1391 | /* |
1392 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode |
1393 | */ |
1394 | if (vc->vc_mode == KD_GRAPHICS) |
1395 | return; |
1396 | |
1397 | complete_change_console(new_vc); |
1398 | } |
1399 | |
1400 | /* Perform a kernel triggered VT switch for suspend/resume */ |
1401 | |
1402 | static int disable_vt_switch; |
1403 | |
1404 | int vt_move_to_console(unsigned int vt, int alloc) |
1405 | { |
1406 | int prev; |
1407 | |
1408 | console_lock(); |
1409 | /* Graphics mode - up to X */ |
1410 | if (disable_vt_switch) { |
1411 | console_unlock(); |
1412 | return 0; |
1413 | } |
1414 | prev = fg_console; |
1415 | |
1416 | if (alloc && vc_allocate(vt)) { |
1417 | /* we can't have a free VC for now. Too bad, |
1418 | * we don't want to mess the screen for now. */ |
1419 | console_unlock(); |
1420 | return -ENOSPC; |
1421 | } |
1422 | |
1423 | if (set_console(vt)) { |
1424 | /* |
1425 | * We're unable to switch to the SUSPEND_CONSOLE. |
1426 | * Let the calling function know so it can decide |
1427 | * what to do. |
1428 | */ |
1429 | console_unlock(); |
1430 | return -EIO; |
1431 | } |
1432 | console_unlock(); |
1433 | if (vt_waitactive(vt + 1)) { |
1434 | pr_debug("Suspend: Can't switch VCs."); |
1435 | return -EINTR; |
1436 | } |
1437 | return prev; |
1438 | } |
1439 | |
1440 | /* |
1441 | * Normally during a suspend, we allocate a new console and switch to it. |
1442 | * When we resume, we switch back to the original console. This switch |
1443 | * can be slow, so on systems where the framebuffer can handle restoration |
1444 | * of video registers anyways, there's little point in doing the console |
1445 | * switch. This function allows you to disable it by passing it '0'. |
1446 | */ |
1447 | void pm_set_vt_switch(int do_switch) |
1448 | { |
1449 | console_lock(); |
1450 | disable_vt_switch = !do_switch; |
1451 | console_unlock(); |
1452 | } |
1453 | EXPORT_SYMBOL(pm_set_vt_switch); |
1454 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9