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5
6
7#include <linux/console.h>
8#include <linux/ctype.h>
9#include <linux/string.h>
10#include <linux/interrupt.h>
11#include <linux/list.h>
12#include <linux/mm.h>
13#include <linux/module.h>
14#include <linux/notifier.h>
15#include <linux/reboot.h>
16#include <linux/proc_fs.h>
17#include <linux/slab.h>
18#include <linux/syscalls.h>
19#include <linux/utsname.h>
20#include <linux/socket.h>
21#include <linux/un.h>
22#include <linux/workqueue.h>
23#include <linux/mutex.h>
24#include <asm/uaccess.h>
25
26#include "init.h"
27#include "irq_kern.h"
28#include "irq_user.h"
29#include "kern_util.h"
30#include "mconsole.h"
31#include "mconsole_kern.h"
32#include "os.h"
33
34static int do_unlink_socket(struct notifier_block *notifier,
35 unsigned long what, void *data)
36{
37 return mconsole_unlink_socket();
38}
39
40
41static struct notifier_block reboot_notifier = {
42 .notifier_call = do_unlink_socket,
43 .priority = 0,
44};
45
46
47
48
49
50
51static LIST_HEAD(mc_requests);
52
53static void mc_work_proc(struct work_struct *unused)
54{
55 struct mconsole_entry *req;
56 unsigned long flags;
57
58 while (!list_empty(&mc_requests)) {
59 local_irq_save(flags);
60 req = list_entry(mc_requests.next, struct mconsole_entry, list);
61 list_del(&req->list);
62 local_irq_restore(flags);
63 req->request.cmd->handler(&req->request);
64 kfree(req);
65 }
66}
67
68static DECLARE_WORK(mconsole_work, mc_work_proc);
69
70static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
71{
72
73 long fd;
74 struct mconsole_entry *new;
75 static struct mc_request req;
76
77 fd = (long) dev_id;
78 while (mconsole_get_request(fd, &req)) {
79 if (req.cmd->context == MCONSOLE_INTR)
80 (*req.cmd->handler)(&req);
81 else {
82 new = kmalloc(sizeof(*new), GFP_NOWAIT);
83 if (new == NULL)
84 mconsole_reply(&req, "Out of memory", 1, 0);
85 else {
86 new->request = req;
87 new->request.regs = get_irq_regs()->regs;
88 list_add(&new->list, &mc_requests);
89 }
90 }
91 }
92 if (!list_empty(&mc_requests))
93 schedule_work(&mconsole_work);
94 reactivate_fd(fd, MCONSOLE_IRQ);
95 return IRQ_HANDLED;
96}
97
98void mconsole_version(struct mc_request *req)
99{
100 char version[256];
101
102 sprintf(version, "%s %s %s %s %s", utsname()->sysname,
103 utsname()->nodename, utsname()->release, utsname()->version,
104 utsname()->machine);
105 mconsole_reply(req, version, 0, 0);
106}
107
108void mconsole_log(struct mc_request *req)
109{
110 int len;
111 char *ptr = req->request.data;
112
113 ptr += strlen("log ");
114
115 len = req->len - (ptr - req->request.data);
116 printk(KERN_WARNING "%.*s", len, ptr);
117 mconsole_reply(req, "", 0, 0);
118}
119
120
121
122
123
124#if 0
125void mconsole_proc(struct mc_request *req)
126{
127 struct vfsmount *mnt = current->nsproxy->pid_ns->proc_mnt;
128 struct file *file;
129 int n;
130 char *ptr = req->request.data, *buf;
131 mm_segment_t old_fs = get_fs();
132
133 ptr += strlen("proc");
134 ptr = skip_spaces(ptr);
135
136 file = file_open_root(mnt->mnt_root, mnt, ptr, O_RDONLY);
137 if (IS_ERR(file)) {
138 mconsole_reply(req, "Failed to open file", 1, 0);
139 goto out;
140 }
141
142 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
143 if (buf == NULL) {
144 mconsole_reply(req, "Failed to allocate buffer", 1, 0);
145 goto out_fput;
146 }
147
148 if (file->f_op->read) {
149 do {
150 loff_t pos;
151 set_fs(KERNEL_DS);
152 n = vfs_read(file, buf, PAGE_SIZE - 1, &pos);
153 file_pos_write(file, pos);
154 set_fs(old_fs);
155 if (n >= 0) {
156 buf[n] = '\0';
157 mconsole_reply(req, buf, 0, (n > 0));
158 }
159 else {
160 mconsole_reply(req, "Read of file failed",
161 1, 0);
162 goto out_free;
163 }
164 } while (n > 0);
165 }
166 else mconsole_reply(req, "", 0, 0);
167
168 out_free:
169 kfree(buf);
170 out_fput:
171 fput(file);
172 out: ;
173}
174#endif
175
176void mconsole_proc(struct mc_request *req)
177{
178 char path[64];
179 char *buf;
180 int len;
181 int fd;
182 int first_chunk = 1;
183 char *ptr = req->request.data;
184
185 ptr += strlen("proc");
186 ptr = skip_spaces(ptr);
187 snprintf(path, sizeof(path), "/proc/%s", ptr);
188
189 fd = sys_open(path, 0, 0);
190 if (fd < 0) {
191 mconsole_reply(req, "Failed to open file", 1, 0);
192 printk(KERN_ERR "open %s: %d\n",path,fd);
193 goto out;
194 }
195
196 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
197 if (buf == NULL) {
198 mconsole_reply(req, "Failed to allocate buffer", 1, 0);
199 goto out_close;
200 }
201
202 for (;;) {
203 len = sys_read(fd, buf, PAGE_SIZE-1);
204 if (len < 0) {
205 mconsole_reply(req, "Read of file failed", 1, 0);
206 goto out_free;
207 }
208
209 if (first_chunk) {
210 mconsole_reply(req, "\n", 0, 1);
211 first_chunk = 0;
212 }
213 if (len == PAGE_SIZE-1) {
214 buf[len] = '\0';
215 mconsole_reply(req, buf, 0, 1);
216 } else {
217 buf[len] = '\0';
218 mconsole_reply(req, buf, 0, 0);
219 break;
220 }
221 }
222
223 out_free:
224 kfree(buf);
225 out_close:
226 sys_close(fd);
227 out:
228 ;
229}
230
231#define UML_MCONSOLE_HELPTEXT \
232"Commands: \n\
233 version - Get kernel version \n\
234 help - Print this message \n\
235 halt - Halt UML \n\
236 reboot - Reboot UML \n\
237 config <dev>=<config> - Add a new device to UML; \n\
238 same syntax as command line \n\
239 config <dev> - Query the configuration of a device \n\
240 remove <dev> - Remove a device from UML \n\
241 sysrq <letter> - Performs the SysRq action controlled by the letter \n\
242 cad - invoke the Ctrl-Alt-Del handler \n\
243 stop - pause the UML; it will do nothing until it receives a 'go' \n\
244 go - continue the UML after a 'stop' \n\
245 log <string> - make UML enter <string> into the kernel log\n\
246 proc <file> - returns the contents of the UML's /proc/<file>\n\
247 stack <pid> - returns the stack of the specified pid\n\
248"
249
250void mconsole_help(struct mc_request *req)
251{
252 mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0);
253}
254
255void mconsole_halt(struct mc_request *req)
256{
257 mconsole_reply(req, "", 0, 0);
258 machine_halt();
259}
260
261void mconsole_reboot(struct mc_request *req)
262{
263 mconsole_reply(req, "", 0, 0);
264 machine_restart(NULL);
265}
266
267void mconsole_cad(struct mc_request *req)
268{
269 mconsole_reply(req, "", 0, 0);
270 ctrl_alt_del();
271}
272
273void mconsole_go(struct mc_request *req)
274{
275 mconsole_reply(req, "Not stopped", 1, 0);
276}
277
278void mconsole_stop(struct mc_request *req)
279{
280 deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
281 os_set_fd_block(req->originating_fd, 1);
282 mconsole_reply(req, "stopped", 0, 0);
283 for (;;) {
284 if (!mconsole_get_request(req->originating_fd, req))
285 continue;
286 if (req->cmd->handler == mconsole_go)
287 break;
288 if (req->cmd->handler == mconsole_stop) {
289 mconsole_reply(req, "Already stopped", 1, 0);
290 continue;
291 }
292 if (req->cmd->handler == mconsole_sysrq) {
293 struct pt_regs *old_regs;
294 old_regs = set_irq_regs((struct pt_regs *)&req->regs);
295 mconsole_sysrq(req);
296 set_irq_regs(old_regs);
297 continue;
298 }
299 (*req->cmd->handler)(req);
300 }
301 os_set_fd_block(req->originating_fd, 0);
302 reactivate_fd(req->originating_fd, MCONSOLE_IRQ);
303 mconsole_reply(req, "", 0, 0);
304}
305
306static DEFINE_SPINLOCK(mc_devices_lock);
307static LIST_HEAD(mconsole_devices);
308
309void mconsole_register_dev(struct mc_device *new)
310{
311 spin_lock(&mc_devices_lock);
312 BUG_ON(!list_empty(&new->list));
313 list_add(&new->list, &mconsole_devices);
314 spin_unlock(&mc_devices_lock);
315}
316
317static struct mc_device *mconsole_find_dev(char *name)
318{
319 struct list_head *ele;
320 struct mc_device *dev;
321
322 list_for_each(ele, &mconsole_devices) {
323 dev = list_entry(ele, struct mc_device, list);
324 if (!strncmp(name, dev->name, strlen(dev->name)))
325 return dev;
326 }
327 return NULL;
328}
329
330#define UNPLUGGED_PER_PAGE \
331 ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long))
332
333struct unplugged_pages {
334 struct list_head list;
335 void *pages[UNPLUGGED_PER_PAGE];
336};
337
338static DEFINE_MUTEX(plug_mem_mutex);
339static unsigned long long unplugged_pages_count = 0;
340static LIST_HEAD(unplugged_pages);
341static int unplug_index = UNPLUGGED_PER_PAGE;
342
343static int mem_config(char *str, char **error_out)
344{
345 unsigned long long diff;
346 int err = -EINVAL, i, add;
347 char *ret;
348
349 if (str[0] != '=') {
350 *error_out = "Expected '=' after 'mem'";
351 goto out;
352 }
353
354 str++;
355 if (str[0] == '-')
356 add = 0;
357 else if (str[0] == '+') {
358 add = 1;
359 }
360 else {
361 *error_out = "Expected increment to start with '-' or '+'";
362 goto out;
363 }
364
365 str++;
366 diff = memparse(str, &ret);
367 if (*ret != '\0') {
368 *error_out = "Failed to parse memory increment";
369 goto out;
370 }
371
372 diff /= PAGE_SIZE;
373
374 mutex_lock(&plug_mem_mutex);
375 for (i = 0; i < diff; i++) {
376 struct unplugged_pages *unplugged;
377 void *addr;
378
379 if (add) {
380 if (list_empty(&unplugged_pages))
381 break;
382
383 unplugged = list_entry(unplugged_pages.next,
384 struct unplugged_pages, list);
385 if (unplug_index > 0)
386 addr = unplugged->pages[--unplug_index];
387 else {
388 list_del(&unplugged->list);
389 addr = unplugged;
390 unplug_index = UNPLUGGED_PER_PAGE;
391 }
392
393 free_page((unsigned long) addr);
394 unplugged_pages_count--;
395 }
396 else {
397 struct page *page;
398
399 page = alloc_page(GFP_ATOMIC);
400 if (page == NULL)
401 break;
402
403 unplugged = page_address(page);
404 if (unplug_index == UNPLUGGED_PER_PAGE) {
405 list_add(&unplugged->list, &unplugged_pages);
406 unplug_index = 0;
407 }
408 else {
409 struct list_head *entry = unplugged_pages.next;
410 addr = unplugged;
411
412 unplugged = list_entry(entry,
413 struct unplugged_pages,
414 list);
415 err = os_drop_memory(addr, PAGE_SIZE);
416 if (err) {
417 printk(KERN_ERR "Failed to release "
418 "memory - errno = %d\n", err);
419 *error_out = "Failed to release memory";
420 goto out_unlock;
421 }
422 unplugged->pages[unplug_index++] = addr;
423 }
424
425 unplugged_pages_count++;
426 }
427 }
428
429 err = 0;
430out_unlock:
431 mutex_unlock(&plug_mem_mutex);
432out:
433 return err;
434}
435
436static int mem_get_config(char *name, char *str, int size, char **error_out)
437{
438 char buf[sizeof("18446744073709551615")];
439 int len = 0;
440
441 sprintf(buf, "%ld", uml_physmem);
442 CONFIG_CHUNK(str, size, len, buf, 1);
443
444 return len;
445}
446
447static int mem_id(char **str, int *start_out, int *end_out)
448{
449 *start_out = 0;
450 *end_out = 0;
451
452 return 0;
453}
454
455static int mem_remove(int n, char **error_out)
456{
457 *error_out = "Memory doesn't support the remove operation";
458 return -EBUSY;
459}
460
461static struct mc_device mem_mc = {
462 .list = LIST_HEAD_INIT(mem_mc.list),
463 .name = "mem",
464 .config = mem_config,
465 .get_config = mem_get_config,
466 .id = mem_id,
467 .remove = mem_remove,
468};
469
470static int __init mem_mc_init(void)
471{
472 if (can_drop_memory())
473 mconsole_register_dev(&mem_mc);
474 else printk(KERN_ERR "Can't release memory to the host - memory "
475 "hotplug won't be supported\n");
476 return 0;
477}
478
479__initcall(mem_mc_init);
480
481#define CONFIG_BUF_SIZE 64
482
483static void mconsole_get_config(int (*get_config)(char *, char *, int,
484 char **),
485 struct mc_request *req, char *name)
486{
487 char default_buf[CONFIG_BUF_SIZE], *error, *buf;
488 int n, size;
489
490 if (get_config == NULL) {
491 mconsole_reply(req, "No get_config routine defined", 1, 0);
492 return;
493 }
494
495 error = NULL;
496 size = ARRAY_SIZE(default_buf);
497 buf = default_buf;
498
499 while (1) {
500 n = (*get_config)(name, buf, size, &error);
501 if (error != NULL) {
502 mconsole_reply(req, error, 1, 0);
503 goto out;
504 }
505
506 if (n <= size) {
507 mconsole_reply(req, buf, 0, 0);
508 goto out;
509 }
510
511 if (buf != default_buf)
512 kfree(buf);
513
514 size = n;
515 buf = kmalloc(size, GFP_KERNEL);
516 if (buf == NULL) {
517 mconsole_reply(req, "Failed to allocate buffer", 1, 0);
518 return;
519 }
520 }
521 out:
522 if (buf != default_buf)
523 kfree(buf);
524}
525
526void mconsole_config(struct mc_request *req)
527{
528 struct mc_device *dev;
529 char *ptr = req->request.data, *name, *error_string = "";
530 int err;
531
532 ptr += strlen("config");
533 ptr = skip_spaces(ptr);
534 dev = mconsole_find_dev(ptr);
535 if (dev == NULL) {
536 mconsole_reply(req, "Bad configuration option", 1, 0);
537 return;
538 }
539
540 name = &ptr[strlen(dev->name)];
541 ptr = name;
542 while ((*ptr != '=') && (*ptr != '\0'))
543 ptr++;
544
545 if (*ptr == '=') {
546 err = (*dev->config)(name, &error_string);
547 mconsole_reply(req, error_string, err, 0);
548 }
549 else mconsole_get_config(dev->get_config, req, name);
550}
551
552void mconsole_remove(struct mc_request *req)
553{
554 struct mc_device *dev;
555 char *ptr = req->request.data, *err_msg = "";
556 char error[256];
557 int err, start, end, n;
558
559 ptr += strlen("remove");
560 ptr = skip_spaces(ptr);
561 dev = mconsole_find_dev(ptr);
562 if (dev == NULL) {
563 mconsole_reply(req, "Bad remove option", 1, 0);
564 return;
565 }
566
567 ptr = &ptr[strlen(dev->name)];
568
569 err = 1;
570 n = (*dev->id)(&ptr, &start, &end);
571 if (n < 0) {
572 err_msg = "Couldn't parse device number";
573 goto out;
574 }
575 else if ((n < start) || (n > end)) {
576 sprintf(error, "Invalid device number - must be between "
577 "%d and %d", start, end);
578 err_msg = error;
579 goto out;
580 }
581
582 err_msg = NULL;
583 err = (*dev->remove)(n, &err_msg);
584 switch(err) {
585 case 0:
586 err_msg = "";
587 break;
588 case -ENODEV:
589 if (err_msg == NULL)
590 err_msg = "Device doesn't exist";
591 break;
592 case -EBUSY:
593 if (err_msg == NULL)
594 err_msg = "Device is currently open";
595 break;
596 default:
597 break;
598 }
599out:
600 mconsole_reply(req, err_msg, err, 0);
601}
602
603struct mconsole_output {
604 struct list_head list;
605 struct mc_request *req;
606};
607
608static DEFINE_SPINLOCK(client_lock);
609static LIST_HEAD(clients);
610static char console_buf[MCONSOLE_MAX_DATA];
611
612static void console_write(struct console *console, const char *string,
613 unsigned int len)
614{
615 struct list_head *ele;
616 int n;
617
618 if (list_empty(&clients))
619 return;
620
621 while (len > 0) {
622 n = min((size_t) len, ARRAY_SIZE(console_buf));
623 strncpy(console_buf, string, n);
624 string += n;
625 len -= n;
626
627 list_for_each(ele, &clients) {
628 struct mconsole_output *entry;
629
630 entry = list_entry(ele, struct mconsole_output, list);
631 mconsole_reply_len(entry->req, console_buf, n, 0, 1);
632 }
633 }
634}
635
636static struct console mc_console = { .name = "mc",
637 .write = console_write,
638 .flags = CON_ENABLED,
639 .index = -1 };
640
641static int mc_add_console(void)
642{
643 register_console(&mc_console);
644 return 0;
645}
646
647late_initcall(mc_add_console);
648
649static void with_console(struct mc_request *req, void (*proc)(void *),
650 void *arg)
651{
652 struct mconsole_output entry;
653 unsigned long flags;
654
655 entry.req = req;
656 spin_lock_irqsave(&client_lock, flags);
657 list_add(&entry.list, &clients);
658 spin_unlock_irqrestore(&client_lock, flags);
659
660 (*proc)(arg);
661
662 mconsole_reply_len(req, "", 0, 0, 0);
663
664 spin_lock_irqsave(&client_lock, flags);
665 list_del(&entry.list);
666 spin_unlock_irqrestore(&client_lock, flags);
667}
668
669#ifdef CONFIG_MAGIC_SYSRQ
670
671#include <linux/sysrq.h>
672
673static void sysrq_proc(void *arg)
674{
675 char *op = arg;
676 handle_sysrq(*op);
677}
678
679void mconsole_sysrq(struct mc_request *req)
680{
681 char *ptr = req->request.data;
682
683 ptr += strlen("sysrq");
684 ptr = skip_spaces(ptr);
685
686
687
688
689
690 if (*ptr == 'b')
691 mconsole_reply(req, "", 0, 0);
692
693 with_console(req, sysrq_proc, ptr);
694}
695#else
696void mconsole_sysrq(struct mc_request *req)
697{
698 mconsole_reply(req, "Sysrq not compiled in", 1, 0);
699}
700#endif
701
702static void stack_proc(void *arg)
703{
704 struct task_struct *from = current, *to = arg;
705
706 to->thread.saved_task = from;
707 switch_to(from, to, from);
708}
709
710
711
712
713
714
715
716void mconsole_stack(struct mc_request *req)
717{
718 char *ptr = req->request.data;
719 int pid_requested= -1;
720 struct task_struct *to = NULL;
721
722
723
724
725
726
727
728 ptr += strlen("stack");
729 ptr = skip_spaces(ptr);
730
731
732
733
734
735 if (sscanf(ptr, "%d", &pid_requested) == 0) {
736 mconsole_reply(req, "Please specify a pid", 1, 0);
737 return;
738 }
739
740 to = find_task_by_pid_ns(pid_requested, &init_pid_ns);
741 if ((to == NULL) || (pid_requested == 0)) {
742 mconsole_reply(req, "Couldn't find that pid", 1, 0);
743 return;
744 }
745 with_console(req, stack_proc, to);
746}
747
748
749
750
751
752static char *notify_socket = NULL;
753
754static int __init mconsole_init(void)
755{
756
757 long sock;
758 int err;
759 char file[UNIX_PATH_MAX];
760
761 if (umid_file_name("mconsole", file, sizeof(file)))
762 return -1;
763 snprintf(mconsole_socket_name, sizeof(file), "%s", file);
764
765 sock = os_create_unix_socket(file, sizeof(file), 1);
766 if (sock < 0) {
767 printk(KERN_ERR "Failed to initialize management console\n");
768 return 1;
769 }
770 if (os_set_fd_block(sock, 0))
771 goto out;
772
773 register_reboot_notifier(&reboot_notifier);
774
775 err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt,
776 IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM,
777 "mconsole", (void *)sock);
778 if (err) {
779 printk(KERN_ERR "Failed to get IRQ for management console\n");
780 goto out;
781 }
782
783 if (notify_socket != NULL) {
784 notify_socket = kstrdup(notify_socket, GFP_KERNEL);
785 if (notify_socket != NULL)
786 mconsole_notify(notify_socket, MCONSOLE_SOCKET,
787 mconsole_socket_name,
788 strlen(mconsole_socket_name) + 1);
789 else printk(KERN_ERR "mconsole_setup failed to strdup "
790 "string\n");
791 }
792
793 printk(KERN_INFO "mconsole (version %d) initialized on %s\n",
794 MCONSOLE_VERSION, mconsole_socket_name);
795 return 0;
796
797 out:
798 os_close_file(sock);
799 return 1;
800}
801
802__initcall(mconsole_init);
803
804static ssize_t mconsole_proc_write(struct file *file,
805 const char __user *buffer, size_t count, loff_t *pos)
806{
807 char *buf;
808
809 buf = kmalloc(count + 1, GFP_KERNEL);
810 if (buf == NULL)
811 return -ENOMEM;
812
813 if (copy_from_user(buf, buffer, count)) {
814 count = -EFAULT;
815 goto out;
816 }
817
818 buf[count] = '\0';
819
820 mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count);
821 out:
822 kfree(buf);
823 return count;
824}
825
826static const struct file_operations mconsole_proc_fops = {
827 .owner = THIS_MODULE,
828 .write = mconsole_proc_write,
829 .llseek = noop_llseek,
830};
831
832static int create_proc_mconsole(void)
833{
834 struct proc_dir_entry *ent;
835
836 if (notify_socket == NULL)
837 return 0;
838
839 ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops);
840 if (ent == NULL) {
841 printk(KERN_INFO "create_proc_mconsole : create_proc_entry "
842 "failed\n");
843 return 0;
844 }
845 return 0;
846}
847
848static DEFINE_SPINLOCK(notify_spinlock);
849
850void lock_notify(void)
851{
852 spin_lock(¬ify_spinlock);
853}
854
855void unlock_notify(void)
856{
857 spin_unlock(¬ify_spinlock);
858}
859
860__initcall(create_proc_mconsole);
861
862#define NOTIFY "notify:"
863
864static int mconsole_setup(char *str)
865{
866 if (!strncmp(str, NOTIFY, strlen(NOTIFY))) {
867 str += strlen(NOTIFY);
868 notify_socket = str;
869 }
870 else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str);
871 return 1;
872}
873
874__setup("mconsole=", mconsole_setup);
875
876__uml_help(mconsole_setup,
877"mconsole=notify:<socket>\n"
878" Requests that the mconsole driver send a message to the named Unix\n"
879" socket containing the name of the mconsole socket. This also serves\n"
880" to notify outside processes when UML has booted far enough to respond\n"
881" to mconsole requests.\n\n"
882);
883
884static int notify_panic(struct notifier_block *self, unsigned long unused1,
885 void *ptr)
886{
887 char *message = ptr;
888
889 if (notify_socket == NULL)
890 return 0;
891
892 mconsole_notify(notify_socket, MCONSOLE_PANIC, message,
893 strlen(message) + 1);
894 return 0;
895}
896
897static struct notifier_block panic_exit_notifier = {
898 .notifier_call = notify_panic,
899 .next = NULL,
900 .priority = 1
901};
902
903static int add_notifier(void)
904{
905 atomic_notifier_chain_register(&panic_notifier_list,
906 &panic_exit_notifier);
907 return 0;
908}
909
910__initcall(add_notifier);
911
912char *mconsole_notify_socket(void)
913{
914 return notify_socket;
915}
916
917EXPORT_SYMBOL(mconsole_notify_socket);
918
