| /* |
| ** Copyright 2010, The Android Open Source Project |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| |
| #define LOG_TAG "Watchdog_N" |
| #include <utils/Log.h> |
| |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <fcntl.h> |
| #include <dirent.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| #include "jni.h" |
| #include "JNIHelp.h" |
| #include <android_runtime/AndroidRuntime.h> |
| |
| static void dumpOneStack(int tid, int outFd) { |
| char buf[64]; |
| |
| snprintf(buf, sizeof(buf), "/proc/%d/stack", tid); |
| int stackFd = open(buf, O_RDONLY); |
| if (stackFd >= 0) { |
| // header for readability |
| strncat(buf, ":\n", sizeof(buf) - strlen(buf) - 1); |
| write(outFd, buf, strlen(buf)); |
| |
| // copy the stack dump text |
| int nBytes; |
| while ((nBytes = read(stackFd, buf, sizeof(buf))) > 0) { |
| write(outFd, buf, nBytes); |
| } |
| |
| // footer and done |
| write(outFd, "\n", 1); |
| close(stackFd); |
| } else { |
| ALOGE("Unable to open stack of tid %d : %d (%s)", tid, errno, strerror(errno)); |
| } |
| } |
| |
| static void dumpKernelStacks(JNIEnv* env, jobject clazz, jstring pathStr) { |
| char buf[128]; |
| DIR* taskdir; |
| |
| ALOGI("dumpKernelStacks"); |
| if (!pathStr) { |
| jniThrowException(env, "java/lang/IllegalArgumentException", "Null path"); |
| return; |
| } |
| |
| const char *path = env->GetStringUTFChars(pathStr, NULL); |
| |
| int outFd = open(path, O_WRONLY | O_APPEND | O_CREAT, |
| S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); |
| if (outFd < 0) { |
| ALOGE("Unable to open stack dump file: %d (%s)", errno, strerror(errno)); |
| goto done; |
| } |
| |
| snprintf(buf, sizeof(buf), "\n----- begin pid %d kernel stacks -----\n", getpid()); |
| write(outFd, buf, strlen(buf)); |
| |
| // look up the list of all threads in this process |
| snprintf(buf, sizeof(buf), "/proc/%d/task", getpid()); |
| taskdir = opendir(buf); |
| if (taskdir != NULL) { |
| struct dirent * ent; |
| while ((ent = readdir(taskdir)) != NULL) { |
| int tid = atoi(ent->d_name); |
| if (tid > 0 && tid <= 65535) { |
| // dump each stack trace |
| dumpOneStack(tid, outFd); |
| } |
| } |
| closedir(taskdir); |
| } |
| |
| snprintf(buf, sizeof(buf), "----- end pid %d kernel stacks -----\n", getpid()); |
| write(outFd, buf, strlen(buf)); |
| |
| close(outFd); |
| done: |
| env->ReleaseStringUTFChars(pathStr, path); |
| } |
| |
| // ---------------------------------------- |
| |
| namespace android { |
| |
| static const JNINativeMethod g_methods[] = { |
| { "native_dumpKernelStacks", "(Ljava/lang/String;)V", (void*)dumpKernelStacks }, |
| }; |
| |
| int register_android_server_Watchdog(JNIEnv* env) { |
| return AndroidRuntime::registerNativeMethods(env, "com/android/server/Watchdog", |
| g_methods, NELEM(g_methods)); |
| } |
| |
| } |