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