/* * Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ #include <string.h> #include "jvmti.h" #include "jvmti_common.h" #include "jvmti_thread.h" extern "C" { /* ============================================================================= */ /* scaffold objects */ static jlong timeout = 0; /* constant names */ #define THREAD_NAME "TestedThread" /* ============================================================================= */ /** Agent algorithm. */ static void JNICALL agentProc(jvmtiEnv *jvmti, JNIEnv *jni, void *arg) { jvmtiError err; LOG("Wait for thread to start\n"); if (!agent_wait_for_sync(timeout)) return; /* perform testing */ { jthread testedThread = NULL; LOG("Find thread: %s\n", THREAD_NAME); testedThread = find_thread_by_name(jvmti, jni, THREAD_NAME); if (testedThread == NULL) { return; } LOG(" ... found thread: %p\n", (void *) testedThread); LOG("Suspend thread: %p\n", (void *) testedThread); suspend_thread(jvmti, jni, testedThread); LOG("Resume thread: %p\n", (void *) testedThread); resume_thread(jvmti, jni, testedThread); LOG("Get state vector for thread: %p\n", (void *) testedThread); { jint state = 0; err = jvmti->GetThreadState(testedThread, &state); if (err != JVMTI_ERROR_NONE) { set_agent_fail_status(); return; } LOG(" ... got state vector: %s (%d)", TranslateState(state), (int) state); if ((state & JVMTI_THREAD_STATE_SUSPENDED) != 0) { LOG("SuspendThread() does not turn off flag SUSPENDED:\n" "# state: %s (%d)\n", TranslateState(state), (int) state); set_agent_fail_status(); } } LOG("Let thread to run and finish\n"); if (!agent_resume_sync()) return; LOG("Wait for thread to finish\n"); if (!agent_wait_for_sync(timeout)) return; LOG("Delete thread reference\n"); jni->DeleteGlobalRef(testedThread); } LOG("Let debugee to finish\n"); if (!agent_resume_sync()) return; } JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) { jvmtiEnv *jvmti = NULL; timeout = 60 * 1000; LOG("Agent_OnLoad started\n"); jint res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_9); if (res != JNI_OK || jvmti == NULL) { LOG("Wrong result of a valid call to GetEnv!\n"); return JNI_ERR; } jvmtiCapabilities caps; memset(&caps, 0, sizeof(caps)); caps.can_suspend = 1; if (jvmti->AddCapabilities(&caps) != JVMTI_ERROR_NONE) { return JNI_ERR; } if (init_agent_data(jvmti, &agent_data) != JVMTI_ERROR_NONE) { return JNI_ERR; } if (!set_agent_proc(agentProc, NULL)) { return JNI_ERR; } return JNI_OK; } }