1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <dirent.h>
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <limits.h>
21 #include <poll.h>
22 #include <signal.h>
23 #include <stdarg.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <sys/inotify.h>
28 #include <sys/stat.h>
29 #include <sys/time.h>
30 #include <sys/wait.h>
31 #include <sys/klog.h>
32 #include <time.h>
33 #include <unistd.h>
34 #include <sys/prctl.h>
35
36 #include <cutils/debugger.h>
37 #include <cutils/properties.h>
38 #include <cutils/sockets.h>
39 #include <private/android_filesystem_config.h>
40
41 #include "dumpstate.h"
42
43 /* list of native processes to include in the native dumps */
44 static const char* native_processes_to_dump[] = {
45 "/system/bin/drmserver",
46 "/system/bin/mediaserver",
47 "/system/bin/sdcard",
48 "/system/bin/surfaceflinger",
49 NULL,
50 };
51
__for_each_pid(void (* helper)(int,const char *,void *),const char * header,void * arg)52 static void __for_each_pid(void (*helper)(int, const char *, void *), const char *header, void *arg) {
53 DIR *d;
54 struct dirent *de;
55
56 if (!(d = opendir("/proc"))) {
57 printf("Failed to open /proc (%s)\n", strerror(errno));
58 return;
59 }
60
61 printf("\n------ %s ------\n", header);
62 while ((de = readdir(d))) {
63 int pid;
64 int fd;
65 char cmdpath[255];
66 char cmdline[255];
67
68 if (!(pid = atoi(de->d_name))) {
69 continue;
70 }
71
72 sprintf(cmdpath,"/proc/%d/cmdline", pid);
73 memset(cmdline, 0, sizeof(cmdline));
74 if ((fd = open(cmdpath, O_RDONLY)) < 0) {
75 strcpy(cmdline, "N/A");
76 } else {
77 read(fd, cmdline, sizeof(cmdline) - 1);
78 close(fd);
79 }
80 helper(pid, cmdline, arg);
81 }
82
83 closedir(d);
84 }
85
for_each_pid_helper(int pid,const char * cmdline,void * arg)86 static void for_each_pid_helper(int pid, const char *cmdline, void *arg) {
87 for_each_pid_func *func = arg;
88 func(pid, cmdline);
89 }
90
for_each_pid(for_each_pid_func func,const char * header)91 void for_each_pid(for_each_pid_func func, const char *header) {
92 __for_each_pid(for_each_pid_helper, header, func);
93 }
94
for_each_tid_helper(int pid,const char * cmdline,void * arg)95 static void for_each_tid_helper(int pid, const char *cmdline, void *arg) {
96 DIR *d;
97 struct dirent *de;
98 char taskpath[255];
99 for_each_tid_func *func = arg;
100
101 sprintf(taskpath, "/proc/%d/task", pid);
102
103 if (!(d = opendir(taskpath))) {
104 printf("Failed to open %s (%s)\n", taskpath, strerror(errno));
105 return;
106 }
107
108 func(pid, pid, cmdline);
109
110 while ((de = readdir(d))) {
111 int tid;
112 int fd;
113 char commpath[255];
114 char comm[255];
115
116 if (!(tid = atoi(de->d_name))) {
117 continue;
118 }
119
120 if (tid == pid)
121 continue;
122
123 sprintf(commpath,"/proc/%d/comm", tid);
124 memset(comm, 0, sizeof(comm));
125 if ((fd = open(commpath, O_RDONLY)) < 0) {
126 strcpy(comm, "N/A");
127 } else {
128 char *c;
129 read(fd, comm, sizeof(comm) - 1);
130 close(fd);
131
132 c = strrchr(comm, '\n');
133 if (c) {
134 *c = '\0';
135 }
136 }
137 func(pid, tid, comm);
138 }
139
140 closedir(d);
141 }
142
for_each_tid(for_each_tid_func func,const char * header)143 void for_each_tid(for_each_tid_func func, const char *header) {
144 __for_each_pid(for_each_tid_helper, header, func);
145 }
146
show_wchan(int pid,int tid,const char * name)147 void show_wchan(int pid, int tid, const char *name) {
148 char path[255];
149 char buffer[255];
150 int fd;
151 char name_buffer[255];
152
153 memset(buffer, 0, sizeof(buffer));
154
155 sprintf(path, "/proc/%d/wchan", tid);
156 if ((fd = open(path, O_RDONLY)) < 0) {
157 printf("Failed to open '%s' (%s)\n", path, strerror(errno));
158 return;
159 }
160
161 if (read(fd, buffer, sizeof(buffer)) < 0) {
162 printf("Failed to read '%s' (%s)\n", path, strerror(errno));
163 goto out_close;
164 }
165
166 snprintf(name_buffer, sizeof(name_buffer), "%*s%s",
167 pid == tid ? 0 : 3, "", name);
168
169 printf("%-7d %-32s %s\n", tid, name_buffer, buffer);
170
171 out_close:
172 close(fd);
173 return;
174 }
175
do_dmesg()176 void do_dmesg() {
177 printf("------ KERNEL LOG (dmesg) ------\n");
178 /* Get size of kernel buffer */
179 int size = klogctl(KLOG_SIZE_BUFFER, NULL, 0);
180 if (size <= 0) {
181 printf("Unexpected klogctl return value: %d\n\n", size);
182 return;
183 }
184 char *buf = (char *) malloc(size + 1);
185 if (buf == NULL) {
186 printf("memory allocation failed\n\n");
187 return;
188 }
189 int retval = klogctl(KLOG_READ_ALL, buf, size);
190 if (retval < 0) {
191 printf("klogctl failure\n\n");
192 free(buf);
193 return;
194 }
195 buf[retval] = '\0';
196 printf("%s\n\n", buf);
197 free(buf);
198 return;
199 }
200
do_showmap(int pid,const char * name)201 void do_showmap(int pid, const char *name) {
202 char title[255];
203 char arg[255];
204
205 sprintf(title, "SHOW MAP %d (%s)", pid, name);
206 sprintf(arg, "%d", pid);
207 run_command(title, 10, SU_PATH, "root", "showmap", arg, NULL);
208 }
209
210 /* prints the contents of a file */
dump_file(const char * title,const char * path)211 int dump_file(const char *title, const char* path) {
212 char buffer[32768];
213 int fd = open(path, O_RDONLY);
214 if (fd < 0) {
215 int err = errno;
216 if (title) printf("------ %s (%s) ------\n", title, path);
217 printf("*** %s: %s\n", path, strerror(err));
218 if (title) printf("\n");
219 return -1;
220 }
221
222 if (title) printf("------ %s (%s", title, path);
223
224 if (title) {
225 struct stat st;
226 if (memcmp(path, "/proc/", 6) && memcmp(path, "/sys/", 5) && !fstat(fd, &st)) {
227 char stamp[80];
228 time_t mtime = st.st_mtime;
229 strftime(stamp, sizeof(stamp), "%Y-%m-%d %H:%M:%S", localtime(&mtime));
230 printf(": %s", stamp);
231 }
232 printf(") ------\n");
233 }
234
235 int newline = 0;
236 for (;;) {
237 int ret = read(fd, buffer, sizeof(buffer));
238 if (ret > 0) {
239 newline = (buffer[ret - 1] == '\n');
240 ret = fwrite(buffer, ret, 1, stdout);
241 }
242 if (ret <= 0) break;
243 }
244
245 close(fd);
246 if (!newline) printf("\n");
247 if (title) printf("\n");
248 return 0;
249 }
250
251 /* forks a command and waits for it to finish */
run_command(const char * title,int timeout_seconds,const char * command,...)252 int run_command(const char *title, int timeout_seconds, const char *command, ...) {
253 fflush(stdout);
254 clock_t start = clock();
255 pid_t pid = fork();
256
257 /* handle error case */
258 if (pid < 0) {
259 printf("*** fork: %s\n", strerror(errno));
260 return pid;
261 }
262
263 /* handle child case */
264 if (pid == 0) {
265 const char *args[1024] = {command};
266 size_t arg;
267
268 /* make sure the child dies when dumpstate dies */
269 prctl(PR_SET_PDEATHSIG, SIGKILL);
270
271 va_list ap;
272 va_start(ap, command);
273 if (title) printf("------ %s (%s", title, command);
274 for (arg = 1; arg < sizeof(args) / sizeof(args[0]); ++arg) {
275 args[arg] = va_arg(ap, const char *);
276 if (args[arg] == NULL) break;
277 if (title) printf(" %s", args[arg]);
278 }
279 if (title) printf(") ------\n");
280 fflush(stdout);
281
282 execvp(command, (char**) args);
283 printf("*** exec(%s): %s\n", command, strerror(errno));
284 fflush(stdout);
285 _exit(-1);
286 }
287
288 /* handle parent case */
289 for (;;) {
290 int status;
291 pid_t p = waitpid(pid, &status, WNOHANG);
292 float elapsed = (float) (clock() - start) / CLOCKS_PER_SEC;
293 if (p == pid) {
294 if (WIFSIGNALED(status)) {
295 printf("*** %s: Killed by signal %d\n", command, WTERMSIG(status));
296 } else if (WIFEXITED(status) && WEXITSTATUS(status) > 0) {
297 printf("*** %s: Exit code %d\n", command, WEXITSTATUS(status));
298 }
299 if (title) printf("[%s: %.1fs elapsed]\n\n", command, elapsed);
300 return status;
301 }
302
303 if (timeout_seconds && elapsed > timeout_seconds) {
304 printf("*** %s: Timed out after %.1fs (killing pid %d)\n", command, elapsed, pid);
305 kill(pid, SIGTERM);
306 return -1;
307 }
308
309 usleep(100000); // poll every 0.1 sec
310 }
311 }
312
313 size_t num_props = 0;
314 static char* props[2000];
315
print_prop(const char * key,const char * name,void * user)316 static void print_prop(const char *key, const char *name, void *user) {
317 (void) user;
318 if (num_props < sizeof(props) / sizeof(props[0])) {
319 char buf[PROPERTY_KEY_MAX + PROPERTY_VALUE_MAX + 10];
320 snprintf(buf, sizeof(buf), "[%s]: [%s]\n", key, name);
321 props[num_props++] = strdup(buf);
322 }
323 }
324
compare_prop(const void * a,const void * b)325 static int compare_prop(const void *a, const void *b) {
326 return strcmp(*(char * const *) a, *(char * const *) b);
327 }
328
329 /* prints all the system properties */
print_properties()330 void print_properties() {
331 size_t i;
332 num_props = 0;
333 property_list(print_prop, NULL);
334 qsort(&props, num_props, sizeof(props[0]), compare_prop);
335
336 printf("------ SYSTEM PROPERTIES ------\n");
337 for (i = 0; i < num_props; ++i) {
338 fputs(props[i], stdout);
339 free(props[i]);
340 }
341 printf("\n");
342 }
343
344 /* redirect output to a service control socket */
redirect_to_socket(FILE * redirect,const char * service)345 void redirect_to_socket(FILE *redirect, const char *service) {
346 int s = android_get_control_socket(service);
347 if (s < 0) {
348 fprintf(stderr, "android_get_control_socket(%s): %s\n", service, strerror(errno));
349 exit(1);
350 }
351 if (listen(s, 4) < 0) {
352 fprintf(stderr, "listen(control socket): %s\n", strerror(errno));
353 exit(1);
354 }
355
356 struct sockaddr addr;
357 socklen_t alen = sizeof(addr);
358 int fd = accept(s, &addr, &alen);
359 if (fd < 0) {
360 fprintf(stderr, "accept(control socket): %s\n", strerror(errno));
361 exit(1);
362 }
363
364 fflush(redirect);
365 dup2(fd, fileno(redirect));
366 close(fd);
367 }
368
369 /* redirect output to a file, optionally gzipping; returns gzip pid (or -1) */
redirect_to_file(FILE * redirect,char * path,int gzip_level)370 pid_t redirect_to_file(FILE *redirect, char *path, int gzip_level) {
371 char *chp = path;
372
373 /* skip initial slash */
374 if (chp[0] == '/')
375 chp++;
376
377 /* create leading directories, if necessary */
378 while (chp && chp[0]) {
379 chp = strchr(chp, '/');
380 if (chp) {
381 *chp = 0;
382 mkdir(path, 0770); /* drwxrwx--- */
383 *chp++ = '/';
384 }
385 }
386
387 int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
388 if (fd < 0) {
389 fprintf(stderr, "%s: %s\n", path, strerror(errno));
390 exit(1);
391 }
392
393 pid_t gzip_pid = -1;
394 if (gzip_level > 0) {
395 int fds[2];
396 if (pipe(fds)) {
397 fprintf(stderr, "pipe: %s\n", strerror(errno));
398 exit(1);
399 }
400
401 fflush(redirect);
402 fflush(stdout);
403
404 gzip_pid = fork();
405 if (gzip_pid < 0) {
406 fprintf(stderr, "fork: %s\n", strerror(errno));
407 exit(1);
408 }
409
410 if (gzip_pid == 0) {
411 dup2(fds[0], STDIN_FILENO);
412 dup2(fd, STDOUT_FILENO);
413
414 close(fd);
415 close(fds[0]);
416 close(fds[1]);
417
418 char level[10];
419 snprintf(level, sizeof(level), "-%d", gzip_level);
420 execlp("gzip", "gzip", level, NULL);
421 fprintf(stderr, "exec(gzip): %s\n", strerror(errno));
422 _exit(-1);
423 }
424
425 close(fd);
426 close(fds[0]);
427 fd = fds[1];
428 }
429
430 dup2(fd, fileno(redirect));
431 close(fd);
432 return gzip_pid;
433 }
434
should_dump_native_traces(const char * path)435 static bool should_dump_native_traces(const char* path) {
436 for (const char** p = native_processes_to_dump; *p; p++) {
437 if (!strcmp(*p, path)) {
438 return true;
439 }
440 }
441 return false;
442 }
443
444 /* dump Dalvik and native stack traces, return the trace file location (NULL if none) */
dump_traces()445 const char *dump_traces() {
446 const char* result = NULL;
447
448 char traces_path[PROPERTY_VALUE_MAX] = "";
449 property_get("dalvik.vm.stack-trace-file", traces_path, "");
450 if (!traces_path[0]) return NULL;
451
452 /* move the old traces.txt (if any) out of the way temporarily */
453 char anr_traces_path[PATH_MAX];
454 strlcpy(anr_traces_path, traces_path, sizeof(anr_traces_path));
455 strlcat(anr_traces_path, ".anr", sizeof(anr_traces_path));
456 if (rename(traces_path, anr_traces_path) && errno != ENOENT) {
457 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, anr_traces_path, strerror(errno));
458 return NULL; // Can't rename old traces.txt -- no permission? -- leave it alone instead
459 }
460
461 /* make the directory if necessary */
462 char anr_traces_dir[PATH_MAX];
463 strlcpy(anr_traces_dir, traces_path, sizeof(anr_traces_dir));
464 char *slash = strrchr(anr_traces_dir, '/');
465 if (slash != NULL) {
466 *slash = '\0';
467 if (!mkdir(anr_traces_dir, 0775)) {
468 chown(anr_traces_dir, AID_SYSTEM, AID_SYSTEM);
469 chmod(anr_traces_dir, 0775);
470 } else if (errno != EEXIST) {
471 fprintf(stderr, "mkdir(%s): %s\n", anr_traces_dir, strerror(errno));
472 return NULL;
473 }
474 }
475
476 /* create a new, empty traces.txt file to receive stack dumps */
477 int fd = open(traces_path, O_CREAT | O_WRONLY | O_TRUNC | O_NOFOLLOW, 0666); /* -rw-rw-rw- */
478 if (fd < 0) {
479 fprintf(stderr, "%s: %s\n", traces_path, strerror(errno));
480 return NULL;
481 }
482 int chmod_ret = fchmod(fd, 0666);
483 if (chmod_ret < 0) {
484 fprintf(stderr, "fchmod on %s failed: %s\n", traces_path, strerror(errno));
485 close(fd);
486 return NULL;
487 }
488
489 /* walk /proc and kill -QUIT all Dalvik processes */
490 DIR *proc = opendir("/proc");
491 if (proc == NULL) {
492 fprintf(stderr, "/proc: %s\n", strerror(errno));
493 goto error_close_fd;
494 }
495
496 /* use inotify to find when processes are done dumping */
497 int ifd = inotify_init();
498 if (ifd < 0) {
499 fprintf(stderr, "inotify_init: %s\n", strerror(errno));
500 goto error_close_fd;
501 }
502
503 int wfd = inotify_add_watch(ifd, traces_path, IN_CLOSE_WRITE);
504 if (wfd < 0) {
505 fprintf(stderr, "inotify_add_watch(%s): %s\n", traces_path, strerror(errno));
506 goto error_close_ifd;
507 }
508
509 struct dirent *d;
510 int dalvik_found = 0;
511 while ((d = readdir(proc))) {
512 int pid = atoi(d->d_name);
513 if (pid <= 0) continue;
514
515 char path[PATH_MAX];
516 char data[PATH_MAX];
517 snprintf(path, sizeof(path), "/proc/%d/exe", pid);
518 ssize_t len = readlink(path, data, sizeof(data) - 1);
519 if (len <= 0) {
520 continue;
521 }
522 data[len] = '\0';
523
524 if (!strcmp(data, "/system/bin/app_process")) {
525 /* skip zygote -- it won't dump its stack anyway */
526 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
527 int fd = open(path, O_RDONLY);
528 len = read(fd, data, sizeof(data) - 1);
529 close(fd);
530 if (len <= 0) {
531 continue;
532 }
533 data[len] = '\0';
534 if (!strcmp(data, "zygote")) {
535 continue;
536 }
537
538 ++dalvik_found;
539 if (kill(pid, SIGQUIT)) {
540 fprintf(stderr, "kill(%d, SIGQUIT): %s\n", pid, strerror(errno));
541 continue;
542 }
543
544 /* wait for the writable-close notification from inotify */
545 struct pollfd pfd = { ifd, POLLIN, 0 };
546 int ret = poll(&pfd, 1, 200); /* 200 msec timeout */
547 if (ret < 0) {
548 fprintf(stderr, "poll: %s\n", strerror(errno));
549 } else if (ret == 0) {
550 fprintf(stderr, "warning: timed out dumping pid %d\n", pid);
551 } else {
552 struct inotify_event ie;
553 read(ifd, &ie, sizeof(ie));
554 }
555 } else if (should_dump_native_traces(data)) {
556 /* dump native process if appropriate */
557 if (lseek(fd, 0, SEEK_END) < 0) {
558 fprintf(stderr, "lseek: %s\n", strerror(errno));
559 } else {
560 dump_backtrace_to_file(pid, fd);
561 }
562 }
563 }
564
565 if (dalvik_found == 0) {
566 fprintf(stderr, "Warning: no Dalvik processes found to dump stacks\n");
567 }
568
569 static char dump_traces_path[PATH_MAX];
570 strlcpy(dump_traces_path, traces_path, sizeof(dump_traces_path));
571 strlcat(dump_traces_path, ".bugreport", sizeof(dump_traces_path));
572 if (rename(traces_path, dump_traces_path)) {
573 fprintf(stderr, "rename(%s, %s): %s\n", traces_path, dump_traces_path, strerror(errno));
574 goto error_close_ifd;
575 }
576 result = dump_traces_path;
577
578 /* replace the saved [ANR] traces.txt file */
579 rename(anr_traces_path, traces_path);
580
581 error_close_ifd:
582 close(ifd);
583 error_close_fd:
584 close(fd);
585 return result;
586 }
587
play_sound(const char * path)588 void play_sound(const char* path) {
589 run_command(NULL, 5, "/system/bin/stagefright", "-o", "-a", path, NULL);
590 }
591