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Christopher Ferris20303f82014-01-10 16:33:16 -08001/*
2 * Copyright 2006, 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 */
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080016
17#include <stdio.h>
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080018#include <errno.h>
19#include <signal.h>
20#include <pthread.h>
21#include <stdarg.h>
22#include <fcntl.h>
23#include <sys/types.h>
24#include <dirent.h>
Jeff Brown053b8652012-06-06 16:25:03 -070025#include <time.h>
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080026
27#include <sys/ptrace.h>
28#include <sys/wait.h>
Elliott Hughescac5d8c2014-01-10 14:40:53 -080029#include <elf.h>
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080030#include <sys/stat.h>
Jeff Brown9524e412011-10-24 11:10:16 -070031#include <sys/poll.h>
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080032
Colin Cross9227bd32013-07-23 16:59:20 -070033#include <log/logger.h>
34
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080035#include <cutils/sockets.h>
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080036#include <cutils/properties.h>
Jeff Brown053b8652012-06-06 16:25:03 -070037#include <cutils/debugger.h>
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080038
39#include <linux/input.h>
40
41#include <private/android_filesystem_config.h>
42
Jeff Brown053b8652012-06-06 16:25:03 -070043#include "backtrace.h"
Jeff Brown13e715b2011-10-21 12:14:56 -070044#include "getevent.h"
Jeff Brown053b8652012-06-06 16:25:03 -070045#include "tombstone.h"
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080046#include "utility.h"
47
Elliott Hughes0df8e4f2014-02-07 12:13:30 -080048struct debugger_request_t {
Christopher Ferris20303f82014-01-10 16:33:16 -080049 debugger_action_t action;
50 pid_t pid, tid;
51 uid_t uid, gid;
52 uintptr_t abort_msg_address;
Elliott Hughes855fcc32014-04-25 16:05:34 -070053 int32_t original_si_code;
Elliott Hughes0df8e4f2014-02-07 12:13:30 -080054};
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080055
Brigid Smith75582952014-06-26 13:22:48 -070056static void wait_for_user_action(const debugger_request_t &request) {
Elliott Hughesd9bf2b22014-05-16 19:16:22 -070057 // Find out the name of the process that crashed.
58 char path[64];
Brigid Smith75582952014-06-26 13:22:48 -070059 snprintf(path, sizeof(path), "/proc/%d/exe", request.pid);
Elliott Hughesd9bf2b22014-05-16 19:16:22 -070060
61 char exe[PATH_MAX];
62 int count;
63 if ((count = readlink(path, exe, sizeof(exe) - 1)) == -1) {
Brigid Smith50eb5462014-06-18 14:17:57 -070064 ALOGE("readlink('%s') failed: %s", path, strerror(errno));
Elliott Hughesd9bf2b22014-05-16 19:16:22 -070065 strlcpy(exe, "unknown", sizeof(exe));
66 } else {
67 exe[count] = '\0';
68 }
69
Elliott Hughesd9bf2b22014-05-16 19:16:22 -070070 // Explain how to attach the debugger.
Brigid Smith50eb5462014-06-18 14:17:57 -070071 ALOGI("********************************************************\n"
72 "* Process %d has been suspended while crashing.\n"
73 "* To attach gdbserver for a gdb connection on port 5039\n"
74 "* and start gdbclient:\n"
75 "*\n"
76 "* gdbclient %s :5039 %d\n"
77 "*\n"
78 "* Wait for gdb to start, then press the VOLUME DOWN key\n"
79 "* to let the process continue crashing.\n"
80 "********************************************************\n",
Brigid Smith75582952014-06-26 13:22:48 -070081 request.pid, exe, request.tid);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080082
Elliott Hughesd9bf2b22014-05-16 19:16:22 -070083 // Wait for VOLUME DOWN.
Christopher Ferris20303f82014-01-10 16:33:16 -080084 if (init_getevent() == 0) {
Elliott Hughesd9bf2b22014-05-16 19:16:22 -070085 while (true) {
Elliott Hughes27ab7512014-05-16 20:54:36 -070086 input_event e;
87 if (get_event(&e, -1) == 0) {
Elliott Hughesd9bf2b22014-05-16 19:16:22 -070088 if (e.type == EV_KEY && e.code == KEY_VOLUMEDOWN && e.value == 0) {
89 break;
Christopher Ferris20303f82014-01-10 16:33:16 -080090 }
Christopher Ferris20303f82014-01-10 16:33:16 -080091 }
Elliott Hughesd9bf2b22014-05-16 19:16:22 -070092 }
Christopher Ferris20303f82014-01-10 16:33:16 -080093 uninit_getevent();
94 }
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -080095
Brigid Smith75582952014-06-26 13:22:48 -070096 ALOGI("debuggerd resuming process %d", request.pid);
Jeff Brown9524e412011-10-24 11:10:16 -070097}
Ben Cheng09e71372009-09-28 11:06:09 -070098
Jeff Brown9524e412011-10-24 11:10:16 -070099static int get_process_info(pid_t tid, pid_t* out_pid, uid_t* out_uid, uid_t* out_gid) {
Christopher Ferris20303f82014-01-10 16:33:16 -0800100 char path[64];
101 snprintf(path, sizeof(path), "/proc/%d/status", tid);
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800102
Christopher Ferris20303f82014-01-10 16:33:16 -0800103 FILE* fp = fopen(path, "r");
104 if (!fp) {
105 return -1;
106 }
Jeff Brown9524e412011-10-24 11:10:16 -0700107
Christopher Ferris20303f82014-01-10 16:33:16 -0800108 int fields = 0;
109 char line[1024];
110 while (fgets(line, sizeof(line), fp)) {
111 size_t len = strlen(line);
112 if (len > 6 && !memcmp(line, "Tgid:\t", 6)) {
113 *out_pid = atoi(line + 6);
114 fields |= 1;
115 } else if (len > 5 && !memcmp(line, "Uid:\t", 5)) {
116 *out_uid = atoi(line + 5);
117 fields |= 2;
118 } else if (len > 5 && !memcmp(line, "Gid:\t", 5)) {
119 *out_gid = atoi(line + 5);
120 fields |= 4;
Jeff Brown9524e412011-10-24 11:10:16 -0700121 }
Christopher Ferris20303f82014-01-10 16:33:16 -0800122 }
123 fclose(fp);
124 return fields == 7 ? 0 : -1;
Jeff Brown9524e412011-10-24 11:10:16 -0700125}
126
Jeff Brown053b8652012-06-06 16:25:03 -0700127static int read_request(int fd, debugger_request_t* out_request) {
Elliott Hughes0df8e4f2014-02-07 12:13:30 -0800128 ucred cr;
129 socklen_t len = sizeof(cr);
Christopher Ferris20303f82014-01-10 16:33:16 -0800130 int status = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &len);
131 if (status != 0) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700132 ALOGE("cannot get credentials\n");
Christopher Ferris20303f82014-01-10 16:33:16 -0800133 return -1;
134 }
135
Brigid Smith50eb5462014-06-18 14:17:57 -0700136 ALOGV("reading tid\n");
Christopher Ferris20303f82014-01-10 16:33:16 -0800137 fcntl(fd, F_SETFL, O_NONBLOCK);
138
Elliott Hughes0df8e4f2014-02-07 12:13:30 -0800139 pollfd pollfds[1];
Christopher Ferris20303f82014-01-10 16:33:16 -0800140 pollfds[0].fd = fd;
141 pollfds[0].events = POLLIN;
142 pollfds[0].revents = 0;
143 status = TEMP_FAILURE_RETRY(poll(pollfds, 1, 3000));
144 if (status != 1) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700145 ALOGE("timed out reading tid (from pid=%d uid=%d)\n", cr.pid, cr.uid);
Christopher Ferris20303f82014-01-10 16:33:16 -0800146 return -1;
147 }
148
149 debugger_msg_t msg;
150 memset(&msg, 0, sizeof(msg));
151 status = TEMP_FAILURE_RETRY(read(fd, &msg, sizeof(msg)));
152 if (status < 0) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700153 ALOGE("read failure? %s (pid=%d uid=%d)\n", strerror(errno), cr.pid, cr.uid);
Christopher Ferris20303f82014-01-10 16:33:16 -0800154 return -1;
155 }
Elliott Hughese901c1b2014-06-19 11:46:27 -0700156 if (status != sizeof(debugger_msg_t)) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700157 ALOGE("invalid crash request of size %d (from pid=%d uid=%d)\n", status, cr.pid, cr.uid);
Christopher Ferris20303f82014-01-10 16:33:16 -0800158 return -1;
159 }
160
161 out_request->action = msg.action;
162 out_request->tid = msg.tid;
163 out_request->pid = cr.pid;
164 out_request->uid = cr.uid;
165 out_request->gid = cr.gid;
166 out_request->abort_msg_address = msg.abort_msg_address;
Elliott Hughes855fcc32014-04-25 16:05:34 -0700167 out_request->original_si_code = msg.original_si_code;
Christopher Ferris20303f82014-01-10 16:33:16 -0800168
169 if (msg.action == DEBUGGER_ACTION_CRASH) {
170 // Ensure that the tid reported by the crashing process is valid.
Josh Gao05288292016-07-14 16:05:10 -0700171 // This check needs to happen again after ptracing the requested thread to prevent a race.
172 if (!pid_contains_tid(out_request->pid, out_request->tid)) {
173 ALOGE("tid %d does not exist in pid %d. ignoring debug request\n", out_request->tid,
174 out_request->pid);
Christopher Ferris20303f82014-01-10 16:33:16 -0800175 return -1;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800176 }
Christopher Ferris20303f82014-01-10 16:33:16 -0800177 } else if (cr.uid == 0
Jeff Brown053b8652012-06-06 16:25:03 -0700178 || (cr.uid == AID_SYSTEM && msg.action == DEBUGGER_ACTION_DUMP_BACKTRACE)) {
Christopher Ferris20303f82014-01-10 16:33:16 -0800179 // Only root or system can ask us to attach to any process and dump it explicitly.
180 // However, system is only allowed to collect backtraces but cannot dump tombstones.
181 status = get_process_info(out_request->tid, &out_request->pid,
182 &out_request->uid, &out_request->gid);
183 if (status < 0) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700184 ALOGE("tid %d does not exist. ignoring explicit dump request\n", out_request->tid);
Christopher Ferris20303f82014-01-10 16:33:16 -0800185 return -1;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800186 }
Christopher Ferris20303f82014-01-10 16:33:16 -0800187 } else {
188 // No one else is allowed to dump arbitrary processes.
189 return -1;
190 }
191 return 0;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800192}
193
Jeff Brown053b8652012-06-06 16:25:03 -0700194static bool should_attach_gdb(debugger_request_t* request) {
Christopher Ferris20303f82014-01-10 16:33:16 -0800195 if (request->action == DEBUGGER_ACTION_CRASH) {
196 char value[PROPERTY_VALUE_MAX];
197 property_get("debug.db.uid", value, "-1");
198 int debug_uid = atoi(value);
199 return debug_uid >= 0 && request->uid <= (uid_t)debug_uid;
200 }
201 return false;
Jeff Brown9524e412011-10-24 11:10:16 -0700202}
Bruce Beare84924902010-10-13 14:21:30 -0700203
Jeff Brown9524e412011-10-24 11:10:16 -0700204static void handle_request(int fd) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700205 ALOGV("handle_request(%d)\n", fd);
Jeff Brown9524e412011-10-24 11:10:16 -0700206
Christopher Ferris20303f82014-01-10 16:33:16 -0800207 debugger_request_t request;
208 memset(&request, 0, sizeof(request));
209 int status = read_request(fd, &request);
210 if (!status) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700211 ALOGV("BOOM: pid=%d uid=%d gid=%d tid=%d\n",
Christopher Ferris20303f82014-01-10 16:33:16 -0800212 request.pid, request.uid, request.gid, request.tid);
Jeff Brown9524e412011-10-24 11:10:16 -0700213
Christopher Ferris20303f82014-01-10 16:33:16 -0800214 // At this point, the thread that made the request is blocked in
215 // a read() call. If the thread has crashed, then this gives us
216 // time to PTRACE_ATTACH to it before it has a chance to really fault.
217 //
218 // The PTRACE_ATTACH sends a SIGSTOP to the target process, but it
219 // won't necessarily have stopped by the time ptrace() returns. (We
220 // currently assume it does.) We write to the file descriptor to
221 // ensure that it can run as soon as we call PTRACE_CONT below.
222 // See details in bionic/libc/linker/debugger.c, in function
223 // debugger_signal_handler().
Josh Gao05288292016-07-14 16:05:10 -0700224 if (!ptrace_attach_thread(request.pid, request.tid)) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700225 ALOGE("ptrace attach failed: %s\n", strerror(errno));
Christopher Ferris20303f82014-01-10 16:33:16 -0800226 } else {
Josh Gao05288292016-07-14 16:05:10 -0700227 // DEBUGGER_ACTION_CRASH requests can come from arbitrary processes and the tid field in
228 // the request is sent from the other side. If an attacker can cause a process to be
229 // spawned with the pid of their process, they could trick debuggerd into dumping that
230 // process by exiting after sending the request. Validate the trusted request.uid/gid
231 // to defend against this.
232 if (request.action == DEBUGGER_ACTION_CRASH) {
233 pid_t pid;
234 uid_t uid;
235 gid_t gid;
236 if (get_process_info(request.tid, &pid, &uid, &gid) != 0) {
237 ALOGE("debuggerd: failed to get process info for tid '%d'", request.tid);
238 exit(1);
239 }
240
241 if (pid != request.pid || uid != request.uid || gid != request.gid) {
242 ALOGE(
243 "debuggerd: attached task %d does not match request: "
244 "expected pid=%d,uid=%d,gid=%d, actual pid=%d,uid=%d,gid=%d",
245 request.tid, request.pid, request.uid, request.gid, pid, uid, gid);
246 exit(1);
247 }
248 }
249
Christopher Ferris20303f82014-01-10 16:33:16 -0800250 bool detach_failed = false;
251 bool attach_gdb = should_attach_gdb(&request);
252 if (TEMP_FAILURE_RETRY(write(fd, "\0", 1)) != 1) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700253 ALOGE("failed responding to client: %s\n", strerror(errno));
Christopher Ferris20303f82014-01-10 16:33:16 -0800254 } else {
255 char* tombstone_path = NULL;
Jeff Brownfb9804b2011-11-08 20:17:05 -0800256
Christopher Ferris20303f82014-01-10 16:33:16 -0800257 if (request.action == DEBUGGER_ACTION_CRASH) {
258 close(fd);
259 fd = -1;
Jeff Brown9524e412011-10-24 11:10:16 -0700260 }
261
Christopher Ferris20303f82014-01-10 16:33:16 -0800262 int total_sleep_time_usec = 0;
263 for (;;) {
264 int signal = wait_for_signal(request.tid, &total_sleep_time_usec);
265 if (signal < 0) {
266 break;
267 }
268
269 switch (signal) {
270 case SIGSTOP:
271 if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700272 ALOGV("stopped -- dumping to tombstone\n");
Elliott Hughes855fcc32014-04-25 16:05:34 -0700273 tombstone_path = engrave_tombstone(request.pid, request.tid,
274 signal, request.original_si_code,
Brigid Smith50eb5462014-06-18 14:17:57 -0700275 request.abort_msg_address, true,
Elliott Hughes855fcc32014-04-25 16:05:34 -0700276 &detach_failed, &total_sleep_time_usec);
Christopher Ferris20303f82014-01-10 16:33:16 -0800277 } else if (request.action == DEBUGGER_ACTION_DUMP_BACKTRACE) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700278 ALOGV("stopped -- dumping to fd\n");
Christopher Ferris20303f82014-01-10 16:33:16 -0800279 dump_backtrace(fd, -1, request.pid, request.tid, &detach_failed,
280 &total_sleep_time_usec);
281 } else {
Brigid Smith50eb5462014-06-18 14:17:57 -0700282 ALOGV("stopped -- continuing\n");
Christopher Ferris20303f82014-01-10 16:33:16 -0800283 status = ptrace(PTRACE_CONT, request.tid, 0, 0);
284 if (status) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700285 ALOGE("ptrace continue failed: %s\n", strerror(errno));
Christopher Ferris20303f82014-01-10 16:33:16 -0800286 }
287 continue; // loop again
288 }
289 break;
290
Christopher Ferris20303f82014-01-10 16:33:16 -0800291 case SIGABRT:
292 case SIGBUS:
293 case SIGFPE:
Elliott Hughes7e35ae82014-05-16 17:05:19 -0700294 case SIGILL:
Christopher Ferris20303f82014-01-10 16:33:16 -0800295 case SIGPIPE:
Elliott Hughes7e35ae82014-05-16 17:05:19 -0700296 case SIGSEGV:
Christopher Ferris20303f82014-01-10 16:33:16 -0800297#ifdef SIGSTKFLT
298 case SIGSTKFLT:
299#endif
Elliott Hughes7e35ae82014-05-16 17:05:19 -0700300 case SIGTRAP:
Brigid Smith50eb5462014-06-18 14:17:57 -0700301 ALOGV("stopped -- fatal signal\n");
Christopher Ferris20303f82014-01-10 16:33:16 -0800302 // Send a SIGSTOP to the process to make all of
303 // the non-signaled threads stop moving. Without
304 // this we get a lot of "ptrace detach failed:
305 // No such process".
306 kill(request.pid, SIGSTOP);
307 // don't dump sibling threads when attaching to GDB because it
308 // makes the process less reliable, apparently...
Elliott Hughes855fcc32014-04-25 16:05:34 -0700309 tombstone_path = engrave_tombstone(request.pid, request.tid,
310 signal, request.original_si_code,
Brigid Smith50eb5462014-06-18 14:17:57 -0700311 request.abort_msg_address, !attach_gdb,
Elliott Hughes855fcc32014-04-25 16:05:34 -0700312 &detach_failed, &total_sleep_time_usec);
Christopher Ferris20303f82014-01-10 16:33:16 -0800313 break;
314
315 default:
Brigid Smith50eb5462014-06-18 14:17:57 -0700316 ALOGE("process stopped due to unexpected signal %d\n", signal);
Christopher Ferris20303f82014-01-10 16:33:16 -0800317 break;
318 }
319 break;
320 }
321
322 if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
323 if (tombstone_path) {
324 write(fd, tombstone_path, strlen(tombstone_path));
325 }
326 close(fd);
327 fd = -1;
328 }
329 free(tombstone_path);
330 }
331
Brigid Smith50eb5462014-06-18 14:17:57 -0700332 ALOGV("detaching\n");
Christopher Ferris20303f82014-01-10 16:33:16 -0800333 if (attach_gdb) {
334 // stop the process so we can debug
335 kill(request.pid, SIGSTOP);
336
337 // detach so we can attach gdbserver
338 if (ptrace(PTRACE_DETACH, request.tid, 0, 0)) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700339 ALOGE("ptrace detach from %d failed: %s\n", request.tid, strerror(errno));
Christopher Ferris20303f82014-01-10 16:33:16 -0800340 detach_failed = true;
341 }
342
343 // if debug.db.uid is set, its value indicates if we should wait
344 // for user action for the crashing process.
345 // in this case, we log a message and turn the debug LED on
346 // waiting for a gdb connection (for instance)
Brigid Smith75582952014-06-26 13:22:48 -0700347 wait_for_user_action(request);
Christopher Ferris20303f82014-01-10 16:33:16 -0800348 } else {
349 // just detach
350 if (ptrace(PTRACE_DETACH, request.tid, 0, 0)) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700351 ALOGE("ptrace detach from %d failed: %s\n", request.tid, strerror(errno));
Christopher Ferris20303f82014-01-10 16:33:16 -0800352 detach_failed = true;
353 }
354 }
355
356 // resume stopped process (so it can crash in peace).
357 kill(request.pid, SIGCONT);
358
359 // If we didn't successfully detach, we're still the parent, and the
360 // actual parent won't receive a death notification via wait(2). At this point
361 // there's not much we can do about that.
362 if (detach_failed) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700363 ALOGE("debuggerd committing suicide to free the zombie!\n");
Christopher Ferris20303f82014-01-10 16:33:16 -0800364 kill(getpid(), SIGKILL);
365 }
Jeff Brown9524e412011-10-24 11:10:16 -0700366 }
Christopher Ferris20303f82014-01-10 16:33:16 -0800367
368 }
369 if (fd >= 0) {
370 close(fd);
371 }
Jeff Brown9524e412011-10-24 11:10:16 -0700372}
373
374static int do_server() {
Elliott Hughesa323b502014-05-16 21:12:17 -0700375 // debuggerd crashes can't be reported to debuggerd.
376 // Reset all of the crash handlers.
Christopher Ferris20303f82014-01-10 16:33:16 -0800377 signal(SIGABRT, SIG_DFL);
378 signal(SIGBUS, SIG_DFL);
379 signal(SIGFPE, SIG_DFL);
Elliott Hughesa323b502014-05-16 21:12:17 -0700380 signal(SIGILL, SIG_DFL);
Christopher Ferris20303f82014-01-10 16:33:16 -0800381 signal(SIGSEGV, SIG_DFL);
Chris Dearman231e3c82012-08-10 17:06:20 -0700382#ifdef SIGSTKFLT
Christopher Ferris20303f82014-01-10 16:33:16 -0800383 signal(SIGSTKFLT, SIG_DFL);
Chris Dearman231e3c82012-08-10 17:06:20 -0700384#endif
Elliott Hughesa323b502014-05-16 21:12:17 -0700385 signal(SIGTRAP, SIG_DFL);
Andy McFadden44e12ec2011-07-29 12:36:47 -0700386
Christopher Ferris20303f82014-01-10 16:33:16 -0800387 // Ignore failed writes to closed sockets
388 signal(SIGPIPE, SIG_IGN);
Nick Kralevich96bcd482013-06-18 17:57:08 -0700389
Elliott Hughesa323b502014-05-16 21:12:17 -0700390 int logsocket = socket_local_client("logd", ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_DGRAM);
Christopher Ferris20303f82014-01-10 16:33:16 -0800391 if (logsocket < 0) {
392 logsocket = -1;
393 } else {
394 fcntl(logsocket, F_SETFD, FD_CLOEXEC);
395 }
396
Elliott Hughesa323b502014-05-16 21:12:17 -0700397 struct sigaction act;
Christopher Ferris20303f82014-01-10 16:33:16 -0800398 act.sa_handler = SIG_DFL;
399 sigemptyset(&act.sa_mask);
400 sigaddset(&act.sa_mask,SIGCHLD);
401 act.sa_flags = SA_NOCLDWAIT;
402 sigaction(SIGCHLD, &act, 0);
403
Elliott Hughesa323b502014-05-16 21:12:17 -0700404 int s = socket_local_server(DEBUGGER_SOCKET_NAME, ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
Christopher Ferris20303f82014-01-10 16:33:16 -0800405 if (s < 0)
406 return 1;
407 fcntl(s, F_SETFD, FD_CLOEXEC);
408
Brigid Smith50eb5462014-06-18 14:17:57 -0700409 ALOGI("debuggerd: " __DATE__ " " __TIME__ "\n");
Christopher Ferris20303f82014-01-10 16:33:16 -0800410
411 for (;;) {
Elliott Hughes0df8e4f2014-02-07 12:13:30 -0800412 sockaddr addr;
413 socklen_t alen = sizeof(addr);
Christopher Ferris20303f82014-01-10 16:33:16 -0800414
Brigid Smith50eb5462014-06-18 14:17:57 -0700415 ALOGV("waiting for connection\n");
Elliott Hughes0df8e4f2014-02-07 12:13:30 -0800416 int fd = accept(s, &addr, &alen);
Christopher Ferris20303f82014-01-10 16:33:16 -0800417 if (fd < 0) {
Brigid Smith50eb5462014-06-18 14:17:57 -0700418 ALOGV("accept failed: %s\n", strerror(errno));
Christopher Ferris20303f82014-01-10 16:33:16 -0800419 continue;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800420 }
421
Christopher Ferris20303f82014-01-10 16:33:16 -0800422 fcntl(fd, F_SETFD, FD_CLOEXEC);
Ben Cheng09e71372009-09-28 11:06:09 -0700423
Christopher Ferris20303f82014-01-10 16:33:16 -0800424 handle_request(fd);
425 }
426 return 0;
The Android Open Source Projectdd7bc332009-03-03 19:32:55 -0800427}
Jeff Brown9524e412011-10-24 11:10:16 -0700428
Jeff Brown053b8652012-06-06 16:25:03 -0700429static int do_explicit_dump(pid_t tid, bool dump_backtrace) {
Christopher Ferris20303f82014-01-10 16:33:16 -0800430 fprintf(stdout, "Sending request to dump task %d.\n", tid);
Jeff Brown9524e412011-10-24 11:10:16 -0700431
Christopher Ferris20303f82014-01-10 16:33:16 -0800432 if (dump_backtrace) {
433 fflush(stdout);
434 if (dump_backtrace_to_file(tid, fileno(stdout)) < 0) {
435 fputs("Error dumping backtrace.\n", stderr);
436 return 1;
Jeff Brown9524e412011-10-24 11:10:16 -0700437 }
Christopher Ferris20303f82014-01-10 16:33:16 -0800438 } else {
439 char tombstone_path[PATH_MAX];
440 if (dump_tombstone(tid, tombstone_path, sizeof(tombstone_path)) < 0) {
441 fputs("Error dumping tombstone.\n", stderr);
442 return 1;
443 }
444 fprintf(stderr, "Tombstone written to: %s\n", tombstone_path);
445 }
446 return 0;
Jeff Brown9524e412011-10-24 11:10:16 -0700447}
448
Jeff Brown053b8652012-06-06 16:25:03 -0700449static void usage() {
Christopher Ferris20303f82014-01-10 16:33:16 -0800450 fputs("Usage: -b [<tid>]\n"
451 " -b dump backtrace to console, otherwise dump full tombstone file\n"
452 "\n"
453 "If tid specified, sends a request to debuggerd to dump that task.\n"
454 "Otherwise, starts the debuggerd server.\n", stderr);
Jeff Brown053b8652012-06-06 16:25:03 -0700455}
456
Jeff Brown9524e412011-10-24 11:10:16 -0700457int main(int argc, char** argv) {
Christopher Ferris20303f82014-01-10 16:33:16 -0800458 if (argc == 1) {
459 return do_server();
460 }
Jeff Brown053b8652012-06-06 16:25:03 -0700461
Christopher Ferris20303f82014-01-10 16:33:16 -0800462 bool dump_backtrace = false;
463 bool have_tid = false;
464 pid_t tid = 0;
465 for (int i = 1; i < argc; i++) {
466 if (!strcmp(argv[i], "-b")) {
467 dump_backtrace = true;
468 } else if (!have_tid) {
469 tid = atoi(argv[i]);
470 have_tid = true;
471 } else {
472 usage();
473 return 1;
Jeff Brown9524e412011-10-24 11:10:16 -0700474 }
Christopher Ferris20303f82014-01-10 16:33:16 -0800475 }
476 if (!have_tid) {
477 usage();
478 return 1;
479 }
480 return do_explicit_dump(tid, dump_backtrace);
Jeff Brown9524e412011-10-24 11:10:16 -0700481}