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