Christopher Tate | ecaa7b4 | 2010-06-04 14:55:02 -0700 | [diff] [blame] | 1 | /* |
| 2 | ** Copyright 2010, 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 | #define LOG_TAG "Watchdog_N" |
| 18 | #include <utils/Log.h> |
| 19 | |
Marco Nelissen | d868913 | 2011-05-09 12:46:56 -0700 | [diff] [blame] | 20 | #include <sys/stat.h> |
Christopher Tate | ecaa7b4 | 2010-06-04 14:55:02 -0700 | [diff] [blame] | 21 | #include <sys/types.h> |
| 22 | #include <fcntl.h> |
| 23 | #include <dirent.h> |
| 24 | #include <string.h> |
| 25 | #include <errno.h> |
| 26 | |
| 27 | #include "jni.h" |
| 28 | #include "JNIHelp.h" |
| 29 | #include <android_runtime/AndroidRuntime.h> |
| 30 | |
| 31 | static void dumpOneStack(int tid, int outFd) { |
| 32 | char buf[64]; |
| 33 | |
| 34 | snprintf(buf, sizeof(buf), "/proc/%d/stack", tid); |
| 35 | int stackFd = open(buf, O_RDONLY); |
| 36 | if (stackFd >= 0) { |
| 37 | // header for readability |
| 38 | strncat(buf, ":\n", sizeof(buf) - strlen(buf) - 1); |
| 39 | write(outFd, buf, strlen(buf)); |
| 40 | |
| 41 | // copy the stack dump text |
| 42 | int nBytes; |
| 43 | while ((nBytes = read(stackFd, buf, sizeof(buf))) > 0) { |
| 44 | write(outFd, buf, nBytes); |
| 45 | } |
| 46 | |
| 47 | // footer and done |
| 48 | write(outFd, "\n", 1); |
| 49 | close(stackFd); |
| 50 | } else { |
Steve Block | 3762c31 | 2012-01-06 19:20:56 +0000 | [diff] [blame] | 51 | ALOGE("Unable to open stack of tid %d : %d (%s)", tid, errno, strerror(errno)); |
Christopher Tate | ecaa7b4 | 2010-06-04 14:55:02 -0700 | [diff] [blame] | 52 | } |
| 53 | } |
| 54 | |
| 55 | static void dumpKernelStacks(JNIEnv* env, jobject clazz, jstring pathStr) { |
| 56 | char buf[128]; |
| 57 | DIR* taskdir; |
| 58 | |
Steve Block | 6215d3f | 2012-01-04 20:05:49 +0000 | [diff] [blame] | 59 | ALOGI("dumpKernelStacks"); |
Christopher Tate | ecaa7b4 | 2010-06-04 14:55:02 -0700 | [diff] [blame] | 60 | if (!pathStr) { |
| 61 | jniThrowException(env, "java/lang/IllegalArgumentException", "Null path"); |
| 62 | return; |
| 63 | } |
| 64 | |
| 65 | const char *path = env->GetStringUTFChars(pathStr, NULL); |
| 66 | |
Marco Nelissen | 19399f4 | 2011-05-09 14:06:57 -0700 | [diff] [blame] | 67 | int outFd = open(path, O_WRONLY | O_APPEND | O_CREAT, |
| 68 | S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); |
Christopher Tate | ecaa7b4 | 2010-06-04 14:55:02 -0700 | [diff] [blame] | 69 | if (outFd < 0) { |
Steve Block | 3762c31 | 2012-01-06 19:20:56 +0000 | [diff] [blame] | 70 | ALOGE("Unable to open stack dump file: %d (%s)", errno, strerror(errno)); |
Christopher Tate | ecaa7b4 | 2010-06-04 14:55:02 -0700 | [diff] [blame] | 71 | goto done; |
| 72 | } |
| 73 | |
| 74 | snprintf(buf, sizeof(buf), "\n----- begin pid %d kernel stacks -----\n", getpid()); |
| 75 | write(outFd, buf, strlen(buf)); |
| 76 | |
| 77 | // look up the list of all threads in this process |
| 78 | snprintf(buf, sizeof(buf), "/proc/%d/task", getpid()); |
| 79 | taskdir = opendir(buf); |
| 80 | if (taskdir != NULL) { |
| 81 | struct dirent * ent; |
| 82 | while ((ent = readdir(taskdir)) != NULL) { |
| 83 | int tid = atoi(ent->d_name); |
| 84 | if (tid > 0 && tid <= 65535) { |
| 85 | // dump each stack trace |
| 86 | dumpOneStack(tid, outFd); |
| 87 | } |
| 88 | } |
| 89 | closedir(taskdir); |
| 90 | } |
| 91 | |
| 92 | snprintf(buf, sizeof(buf), "----- end pid %d kernel stacks -----\n", getpid()); |
| 93 | write(outFd, buf, strlen(buf)); |
| 94 | |
| 95 | close(outFd); |
| 96 | done: |
| 97 | env->ReleaseStringUTFChars(pathStr, path); |
| 98 | } |
| 99 | |
| 100 | // ---------------------------------------- |
| 101 | |
| 102 | namespace android { |
| 103 | |
| 104 | static const JNINativeMethod g_methods[] = { |
| 105 | { "native_dumpKernelStacks", "(Ljava/lang/String;)V", (void*)dumpKernelStacks }, |
| 106 | }; |
| 107 | |
| 108 | int register_android_server_Watchdog(JNIEnv* env) { |
| 109 | return AndroidRuntime::registerNativeMethods(env, "com/android/server/Watchdog", |
| 110 | g_methods, NELEM(g_methods)); |
| 111 | } |
| 112 | |
| 113 | } |