Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) | |
3 | * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com) | |
4 | * Licensed under the GPL | |
5 | */ | |
6 | ||
7 | #include "linux/kernel.h" | |
8 | #include "linux/slab.h" | |
9 | #include "linux/init.h" | |
10 | #include "linux/notifier.h" | |
11 | #include "linux/reboot.h" | |
12 | #include "linux/utsname.h" | |
13 | #include "linux/ctype.h" | |
14 | #include "linux/interrupt.h" | |
15 | #include "linux/sysrq.h" | |
16 | #include "linux/workqueue.h" | |
17 | #include "linux/module.h" | |
18 | #include "linux/file.h" | |
19 | #include "linux/fs.h" | |
20 | #include "linux/namei.h" | |
21 | #include "linux/proc_fs.h" | |
22 | #include "linux/syscalls.h" | |
23 | #include "asm/irq.h" | |
24 | #include "asm/uaccess.h" | |
25 | #include "user_util.h" | |
26 | #include "kern_util.h" | |
27 | #include "kern.h" | |
28 | #include "mconsole.h" | |
29 | #include "mconsole_kern.h" | |
30 | #include "irq_user.h" | |
31 | #include "init.h" | |
32 | #include "os.h" | |
33 | #include "umid.h" | |
34 | #include "irq_kern.h" | |
3eddddcf | 35 | #include "choose-mode.h" |
1da177e4 LT |
36 | |
37 | static int do_unlink_socket(struct notifier_block *notifier, | |
38 | unsigned long what, void *data) | |
39 | { | |
40 | return(mconsole_unlink_socket()); | |
41 | } | |
42 | ||
43 | ||
44 | static struct notifier_block reboot_notifier = { | |
45 | .notifier_call = do_unlink_socket, | |
46 | .priority = 0, | |
47 | }; | |
48 | ||
49 | /* Safe without explicit locking for now. Tasklets provide their own | |
50 | * locking, and the interrupt handler is safe because it can't interrupt | |
51 | * itself and it can only happen on CPU 0. | |
52 | */ | |
53 | ||
54 | LIST_HEAD(mc_requests); | |
55 | ||
56 | static void mc_work_proc(void *unused) | |
57 | { | |
58 | struct mconsole_entry *req; | |
59 | unsigned long flags; | |
60 | ||
61 | while(!list_empty(&mc_requests)){ | |
62 | local_save_flags(flags); | |
63 | req = list_entry(mc_requests.next, struct mconsole_entry, | |
64 | list); | |
65 | list_del(&req->list); | |
66 | local_irq_restore(flags); | |
67 | req->request.cmd->handler(&req->request); | |
68 | kfree(req); | |
69 | } | |
70 | } | |
71 | ||
72 | DECLARE_WORK(mconsole_work, mc_work_proc, NULL); | |
73 | ||
74 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id, | |
75 | struct pt_regs *regs) | |
76 | { | |
77 | /* long to avoid size mismatch warnings from gcc */ | |
78 | long fd; | |
79 | struct mconsole_entry *new; | |
80 | struct mc_request req; | |
81 | ||
82 | fd = (long) dev_id; | |
83 | while (mconsole_get_request(fd, &req)){ | |
84 | if(req.cmd->context == MCONSOLE_INTR) | |
85 | (*req.cmd->handler)(&req); | |
86 | else { | |
87 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
88 | if(new == NULL) | |
89 | mconsole_reply(&req, "Out of memory", 1, 0); | |
90 | else { | |
91 | new->request = req; | |
92 | list_add(&new->list, &mc_requests); | |
93 | } | |
94 | } | |
95 | } | |
96 | if(!list_empty(&mc_requests)) | |
97 | schedule_work(&mconsole_work); | |
98 | reactivate_fd(fd, MCONSOLE_IRQ); | |
99 | return(IRQ_HANDLED); | |
100 | } | |
101 | ||
102 | void mconsole_version(struct mc_request *req) | |
103 | { | |
104 | char version[256]; | |
105 | ||
106 | sprintf(version, "%s %s %s %s %s", system_utsname.sysname, | |
107 | system_utsname.nodename, system_utsname.release, | |
108 | system_utsname.version, system_utsname.machine); | |
109 | mconsole_reply(req, version, 0, 0); | |
110 | } | |
111 | ||
112 | void mconsole_log(struct mc_request *req) | |
113 | { | |
114 | int len; | |
115 | char *ptr = req->request.data; | |
116 | ||
117 | ptr += strlen("log "); | |
118 | ||
119 | len = req->len - (ptr - req->request.data); | |
120 | printk("%.*s", len, ptr); | |
121 | mconsole_reply(req, "", 0, 0); | |
122 | } | |
123 | ||
124 | /* This is a more convoluted version of mconsole_proc, which has some stability | |
125 | * problems; however, we need it fixed, because it is expected that UML users | |
126 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still | |
127 | * show the real procfs content, not the ones from hppfs.*/ | |
128 | #if 0 | |
129 | void mconsole_proc(struct mc_request *req) | |
130 | { | |
131 | struct nameidata nd; | |
132 | struct file_system_type *proc; | |
133 | struct super_block *super; | |
134 | struct file *file; | |
135 | int n, err; | |
136 | char *ptr = req->request.data, *buf; | |
137 | ||
138 | ptr += strlen("proc"); | |
139 | while(isspace(*ptr)) ptr++; | |
140 | ||
141 | proc = get_fs_type("proc"); | |
142 | if(proc == NULL){ | |
143 | mconsole_reply(req, "procfs not registered", 1, 0); | |
144 | goto out; | |
145 | } | |
146 | ||
147 | super = (*proc->get_sb)(proc, 0, NULL, NULL); | |
148 | put_filesystem(proc); | |
149 | if(super == NULL){ | |
150 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); | |
151 | goto out; | |
152 | } | |
153 | up_write(&super->s_umount); | |
154 | ||
155 | nd.dentry = super->s_root; | |
156 | nd.mnt = NULL; | |
157 | nd.flags = O_RDONLY + 1; | |
158 | nd.last_type = LAST_ROOT; | |
159 | ||
160 | /* START: it was experienced that the stability problems are closed | |
161 | * if commenting out these two calls + the below read cycle. To | |
162 | * make UML crash again, it was enough to readd either one.*/ | |
163 | err = link_path_walk(ptr, &nd); | |
164 | if(err){ | |
165 | mconsole_reply(req, "Failed to look up file", 1, 0); | |
166 | goto out_kill; | |
167 | } | |
168 | ||
169 | file = dentry_open(nd.dentry, nd.mnt, O_RDONLY); | |
170 | if(IS_ERR(file)){ | |
171 | mconsole_reply(req, "Failed to open file", 1, 0); | |
172 | goto out_kill; | |
173 | } | |
174 | /*END*/ | |
175 | ||
176 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
177 | if(buf == NULL){ | |
178 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
179 | goto out_fput; | |
180 | } | |
181 | ||
182 | if((file->f_op != NULL) && (file->f_op->read != NULL)){ | |
183 | do { | |
184 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, | |
185 | &file->f_pos); | |
186 | if(n >= 0){ | |
187 | buf[n] = '\0'; | |
188 | mconsole_reply(req, buf, 0, (n > 0)); | |
189 | } | |
190 | else { | |
191 | mconsole_reply(req, "Read of file failed", | |
192 | 1, 0); | |
193 | goto out_free; | |
194 | } | |
195 | } while(n > 0); | |
196 | } | |
197 | else mconsole_reply(req, "", 0, 0); | |
198 | ||
199 | out_free: | |
200 | kfree(buf); | |
201 | out_fput: | |
202 | fput(file); | |
203 | out_kill: | |
204 | deactivate_super(super); | |
205 | out: ; | |
206 | } | |
207 | #endif | |
208 | ||
209 | void mconsole_proc(struct mc_request *req) | |
210 | { | |
211 | char path[64]; | |
212 | char *buf; | |
213 | int len; | |
214 | int fd; | |
215 | int first_chunk = 1; | |
216 | char *ptr = req->request.data; | |
217 | ||
218 | ptr += strlen("proc"); | |
219 | while(isspace(*ptr)) ptr++; | |
220 | snprintf(path, sizeof(path), "/proc/%s", ptr); | |
221 | ||
222 | fd = sys_open(path, 0, 0); | |
223 | if (fd < 0) { | |
224 | mconsole_reply(req, "Failed to open file", 1, 0); | |
225 | printk("open %s: %d\n",path,fd); | |
226 | goto out; | |
227 | } | |
228 | ||
229 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
230 | if(buf == NULL){ | |
231 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
232 | goto out_close; | |
233 | } | |
234 | ||
235 | for (;;) { | |
236 | len = sys_read(fd, buf, PAGE_SIZE-1); | |
237 | if (len < 0) { | |
238 | mconsole_reply(req, "Read of file failed", 1, 0); | |
239 | goto out_free; | |
240 | } | |
241 | /*Begin the file content on his own line.*/ | |
242 | if (first_chunk) { | |
243 | mconsole_reply(req, "\n", 0, 1); | |
244 | first_chunk = 0; | |
245 | } | |
246 | if (len == PAGE_SIZE-1) { | |
247 | buf[len] = '\0'; | |
248 | mconsole_reply(req, buf, 0, 1); | |
249 | } else { | |
250 | buf[len] = '\0'; | |
251 | mconsole_reply(req, buf, 0, 0); | |
252 | break; | |
253 | } | |
254 | } | |
255 | ||
256 | out_free: | |
257 | kfree(buf); | |
258 | out_close: | |
259 | sys_close(fd); | |
260 | out: | |
261 | /* nothing */; | |
262 | } | |
263 | ||
264 | #define UML_MCONSOLE_HELPTEXT \ | |
265 | "Commands: \n\ | |
266 | version - Get kernel version \n\ | |
267 | help - Print this message \n\ | |
268 | halt - Halt UML \n\ | |
269 | reboot - Reboot UML \n\ | |
270 | config <dev>=<config> - Add a new device to UML; \n\ | |
271 | same syntax as command line \n\ | |
272 | config <dev> - Query the configuration of a device \n\ | |
273 | remove <dev> - Remove a device from UML \n\ | |
274 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ | |
275 | cad - invoke the Ctl-Alt-Del handler \n\ | |
276 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ | |
277 | go - continue the UML after a 'stop' \n\ | |
278 | log <string> - make UML enter <string> into the kernel log\n\ | |
279 | proc <file> - returns the contents of the UML's /proc/<file>\n\ | |
3eddddcf | 280 | stack <pid> - returns the stack of the specified pid\n\ |
1da177e4 LT |
281 | " |
282 | ||
283 | void mconsole_help(struct mc_request *req) | |
284 | { | |
285 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); | |
286 | } | |
287 | ||
288 | void mconsole_halt(struct mc_request *req) | |
289 | { | |
290 | mconsole_reply(req, "", 0, 0); | |
291 | machine_halt(); | |
292 | } | |
293 | ||
294 | void mconsole_reboot(struct mc_request *req) | |
295 | { | |
296 | mconsole_reply(req, "", 0, 0); | |
297 | machine_restart(NULL); | |
298 | } | |
299 | ||
300 | extern void ctrl_alt_del(void); | |
301 | ||
302 | void mconsole_cad(struct mc_request *req) | |
303 | { | |
304 | mconsole_reply(req, "", 0, 0); | |
305 | ctrl_alt_del(); | |
306 | } | |
307 | ||
308 | void mconsole_go(struct mc_request *req) | |
309 | { | |
310 | mconsole_reply(req, "Not stopped", 1, 0); | |
311 | } | |
312 | ||
313 | void mconsole_stop(struct mc_request *req) | |
314 | { | |
315 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
316 | os_set_fd_block(req->originating_fd, 1); | |
317 | mconsole_reply(req, "", 0, 0); | |
318 | while(mconsole_get_request(req->originating_fd, req)){ | |
319 | if(req->cmd->handler == mconsole_go) break; | |
320 | (*req->cmd->handler)(req); | |
321 | } | |
322 | os_set_fd_block(req->originating_fd, 0); | |
323 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
324 | mconsole_reply(req, "", 0, 0); | |
325 | } | |
326 | ||
327 | /* This list is populated by __initcall routines. */ | |
328 | ||
329 | LIST_HEAD(mconsole_devices); | |
330 | ||
331 | void mconsole_register_dev(struct mc_device *new) | |
332 | { | |
333 | list_add(&new->list, &mconsole_devices); | |
334 | } | |
335 | ||
336 | static struct mc_device *mconsole_find_dev(char *name) | |
337 | { | |
338 | struct list_head *ele; | |
339 | struct mc_device *dev; | |
340 | ||
341 | list_for_each(ele, &mconsole_devices){ | |
342 | dev = list_entry(ele, struct mc_device, list); | |
343 | if(!strncmp(name, dev->name, strlen(dev->name))) | |
344 | return(dev); | |
345 | } | |
346 | return(NULL); | |
347 | } | |
348 | ||
349 | #define CONFIG_BUF_SIZE 64 | |
350 | ||
351 | static void mconsole_get_config(int (*get_config)(char *, char *, int, | |
352 | char **), | |
353 | struct mc_request *req, char *name) | |
354 | { | |
355 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
356 | int n, size; | |
357 | ||
358 | if(get_config == NULL){ | |
359 | mconsole_reply(req, "No get_config routine defined", 1, 0); | |
360 | return; | |
361 | } | |
362 | ||
363 | error = NULL; | |
364 | size = sizeof(default_buf)/sizeof(default_buf[0]); | |
365 | buf = default_buf; | |
366 | ||
367 | while(1){ | |
368 | n = (*get_config)(name, buf, size, &error); | |
369 | if(error != NULL){ | |
370 | mconsole_reply(req, error, 1, 0); | |
371 | goto out; | |
372 | } | |
373 | ||
374 | if(n <= size){ | |
375 | mconsole_reply(req, buf, 0, 0); | |
376 | goto out; | |
377 | } | |
378 | ||
379 | if(buf != default_buf) | |
380 | kfree(buf); | |
381 | ||
382 | size = n; | |
383 | buf = kmalloc(size, GFP_KERNEL); | |
384 | if(buf == NULL){ | |
385 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
386 | return; | |
387 | } | |
388 | } | |
389 | out: | |
390 | if(buf != default_buf) | |
391 | kfree(buf); | |
392 | ||
393 | } | |
394 | ||
395 | void mconsole_config(struct mc_request *req) | |
396 | { | |
397 | struct mc_device *dev; | |
398 | char *ptr = req->request.data, *name; | |
399 | int err; | |
400 | ||
401 | ptr += strlen("config"); | |
402 | while(isspace(*ptr)) ptr++; | |
403 | dev = mconsole_find_dev(ptr); | |
404 | if(dev == NULL){ | |
405 | mconsole_reply(req, "Bad configuration option", 1, 0); | |
406 | return; | |
407 | } | |
408 | ||
409 | name = &ptr[strlen(dev->name)]; | |
410 | ptr = name; | |
411 | while((*ptr != '=') && (*ptr != '\0')) | |
412 | ptr++; | |
413 | ||
414 | if(*ptr == '='){ | |
415 | err = (*dev->config)(name); | |
416 | mconsole_reply(req, "", err, 0); | |
417 | } | |
418 | else mconsole_get_config(dev->get_config, req, name); | |
419 | } | |
420 | ||
421 | void mconsole_remove(struct mc_request *req) | |
422 | { | |
423 | struct mc_device *dev; | |
29d56cfe JD |
424 | char *ptr = req->request.data, *err_msg = ""; |
425 | char error[256]; | |
426 | int err, start, end, n; | |
1da177e4 LT |
427 | |
428 | ptr += strlen("remove"); | |
429 | while(isspace(*ptr)) ptr++; | |
430 | dev = mconsole_find_dev(ptr); | |
431 | if(dev == NULL){ | |
432 | mconsole_reply(req, "Bad remove option", 1, 0); | |
433 | return; | |
434 | } | |
29d56cfe JD |
435 | |
436 | ptr = &ptr[strlen(dev->name)]; | |
437 | ||
438 | err = 1; | |
439 | n = (*dev->id)(&ptr, &start, &end); | |
440 | if(n < 0){ | |
441 | err_msg = "Couldn't parse device number"; | |
442 | goto out; | |
443 | } | |
444 | else if((n < start) || (n > end)){ | |
445 | sprintf(error, "Invalid device number - must be between " | |
446 | "%d and %d", start, end); | |
447 | err_msg = error; | |
448 | goto out; | |
449 | } | |
450 | ||
451 | err = (*dev->remove)(n); | |
452 | switch(err){ | |
453 | case -ENODEV: | |
454 | err_msg = "Device doesn't exist"; | |
455 | break; | |
456 | case -EBUSY: | |
457 | err_msg = "Device is currently open"; | |
458 | break; | |
459 | default: | |
460 | break; | |
461 | } | |
462 | out: | |
463 | mconsole_reply(req, err_msg, err, 0); | |
1da177e4 LT |
464 | } |
465 | ||
466 | #ifdef CONFIG_MAGIC_SYSRQ | |
467 | void mconsole_sysrq(struct mc_request *req) | |
468 | { | |
469 | char *ptr = req->request.data; | |
470 | ||
471 | ptr += strlen("sysrq"); | |
472 | while(isspace(*ptr)) ptr++; | |
473 | ||
474 | mconsole_reply(req, "", 0, 0); | |
475 | handle_sysrq(*ptr, ¤t->thread.regs, NULL); | |
476 | } | |
477 | #else | |
478 | void mconsole_sysrq(struct mc_request *req) | |
479 | { | |
480 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
481 | } | |
482 | #endif | |
483 | ||
3eddddcf JD |
484 | /* Mconsole stack trace |
485 | * Added by Allan Graves, Jeff Dike | |
486 | * Dumps a stacks registers to the linux console. | |
487 | * Usage stack <pid>. | |
488 | */ | |
489 | void do_stack(struct mc_request *req) | |
490 | { | |
491 | char *ptr = req->request.data; | |
492 | int pid_requested= -1; | |
493 | struct task_struct *from = NULL; | |
494 | struct task_struct *to = NULL; | |
495 | ||
496 | /* Would be nice: | |
497 | * 1) Send showregs output to mconsole. | |
498 | * 2) Add a way to stack dump all pids. | |
499 | */ | |
500 | ||
501 | ptr += strlen("stack"); | |
502 | while(isspace(*ptr)) ptr++; | |
503 | ||
504 | /* Should really check for multiple pids or reject bad args here */ | |
505 | /* What do the arguments in mconsole_reply mean? */ | |
506 | if(sscanf(ptr, "%d", &pid_requested) == 0){ | |
507 | mconsole_reply(req, "Please specify a pid", 1, 0); | |
508 | return; | |
509 | } | |
510 | ||
511 | from = current; | |
512 | to = find_task_by_pid(pid_requested); | |
513 | ||
514 | if((to == NULL) || (pid_requested == 0)) { | |
515 | mconsole_reply(req, "Couldn't find that pid", 1, 0); | |
516 | return; | |
517 | } | |
518 | to->thread.saved_task = current; | |
519 | ||
520 | switch_to(from, to, from); | |
521 | mconsole_reply(req, "Stack Dumped to console and message log", 0, 0); | |
522 | } | |
523 | ||
524 | void mconsole_stack(struct mc_request *req) | |
525 | { | |
526 | /* This command doesn't work in TT mode, so let's check and then | |
527 | * get out of here | |
528 | */ | |
529 | CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode", | |
530 | 1, 0), | |
531 | do_stack(req)); | |
532 | } | |
533 | ||
1da177e4 LT |
534 | /* Changed by mconsole_setup, which is __setup, and called before SMP is |
535 | * active. | |
536 | */ | |
537 | static char *notify_socket = NULL; | |
538 | ||
539 | int mconsole_init(void) | |
540 | { | |
541 | /* long to avoid size mismatch warnings from gcc */ | |
542 | long sock; | |
543 | int err; | |
544 | char file[256]; | |
545 | ||
546 | if(umid_file_name("mconsole", file, sizeof(file))) return(-1); | |
547 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); | |
548 | ||
549 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
550 | if (sock < 0){ | |
551 | printk("Failed to initialize management console\n"); | |
552 | return(1); | |
553 | } | |
554 | ||
555 | register_reboot_notifier(&reboot_notifier); | |
556 | ||
557 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
558 | SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, | |
559 | "mconsole", (void *)sock); | |
560 | if (err){ | |
561 | printk("Failed to get IRQ for management console\n"); | |
562 | return(1); | |
563 | } | |
564 | ||
565 | if(notify_socket != NULL){ | |
566 | notify_socket = uml_strdup(notify_socket); | |
567 | if(notify_socket != NULL) | |
568 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, | |
569 | mconsole_socket_name, | |
570 | strlen(mconsole_socket_name) + 1); | |
571 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
572 | "string\n"); | |
573 | } | |
574 | ||
575 | printk("mconsole (version %d) initialized on %s\n", | |
576 | MCONSOLE_VERSION, mconsole_socket_name); | |
577 | return(0); | |
578 | } | |
579 | ||
580 | __initcall(mconsole_init); | |
581 | ||
582 | static int write_proc_mconsole(struct file *file, const char __user *buffer, | |
583 | unsigned long count, void *data) | |
584 | { | |
585 | char *buf; | |
586 | ||
587 | buf = kmalloc(count + 1, GFP_KERNEL); | |
588 | if(buf == NULL) | |
589 | return(-ENOMEM); | |
590 | ||
591 | if(copy_from_user(buf, buffer, count)){ | |
592 | count = -EFAULT; | |
593 | goto out; | |
594 | } | |
595 | ||
596 | buf[count] = '\0'; | |
597 | ||
598 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
599 | out: | |
600 | kfree(buf); | |
601 | return(count); | |
602 | } | |
603 | ||
604 | static int create_proc_mconsole(void) | |
605 | { | |
606 | struct proc_dir_entry *ent; | |
607 | ||
608 | if(notify_socket == NULL) return(0); | |
609 | ||
610 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); | |
611 | if(ent == NULL){ | |
30f417c6 | 612 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry failed\n"); |
1da177e4 LT |
613 | return(0); |
614 | } | |
615 | ||
616 | ent->read_proc = NULL; | |
617 | ent->write_proc = write_proc_mconsole; | |
618 | return(0); | |
619 | } | |
620 | ||
621 | static DEFINE_SPINLOCK(notify_spinlock); | |
622 | ||
623 | void lock_notify(void) | |
624 | { | |
625 | spin_lock(¬ify_spinlock); | |
626 | } | |
627 | ||
628 | void unlock_notify(void) | |
629 | { | |
630 | spin_unlock(¬ify_spinlock); | |
631 | } | |
632 | ||
633 | __initcall(create_proc_mconsole); | |
634 | ||
635 | #define NOTIFY "=notify:" | |
636 | ||
637 | static int mconsole_setup(char *str) | |
638 | { | |
639 | if(!strncmp(str, NOTIFY, strlen(NOTIFY))){ | |
640 | str += strlen(NOTIFY); | |
641 | notify_socket = str; | |
642 | } | |
643 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
644 | return(1); | |
645 | } | |
646 | ||
647 | __setup("mconsole", mconsole_setup); | |
648 | ||
649 | __uml_help(mconsole_setup, | |
650 | "mconsole=notify:<socket>\n" | |
651 | " Requests that the mconsole driver send a message to the named Unix\n" | |
652 | " socket containing the name of the mconsole socket. This also serves\n" | |
653 | " to notify outside processes when UML has booted far enough to respond\n" | |
654 | " to mconsole requests.\n\n" | |
655 | ); | |
656 | ||
657 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
658 | void *ptr) | |
659 | { | |
660 | char *message = ptr; | |
661 | ||
662 | if(notify_socket == NULL) return(0); | |
663 | ||
664 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, | |
665 | strlen(message) + 1); | |
666 | return(0); | |
667 | } | |
668 | ||
669 | static struct notifier_block panic_exit_notifier = { | |
670 | .notifier_call = notify_panic, | |
671 | .next = NULL, | |
672 | .priority = 1 | |
673 | }; | |
674 | ||
675 | static int add_notifier(void) | |
676 | { | |
677 | notifier_chain_register(&panic_notifier_list, &panic_exit_notifier); | |
678 | return(0); | |
679 | } | |
680 | ||
681 | __initcall(add_notifier); | |
682 | ||
683 | char *mconsole_notify_socket(void) | |
684 | { | |
685 | return(notify_socket); | |
686 | } | |
687 | ||
688 | EXPORT_SYMBOL(mconsole_notify_socket); | |
689 | ||
690 | /* | |
691 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
692 | * Emacs will notice this stuff at the end of the file and automatically | |
693 | * adjust the settings for this buffer only. This must remain at the end | |
694 | * of the file. | |
695 | * --------------------------------------------------------------------------- | |
696 | * Local variables: | |
697 | * c-file-style: "linux" | |
698 | * End: | |
699 | */ |