/* * Copyright (C) 2019 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. */ #include #include #include #include #include #include // For POSIX basename(). // Use _system_properties.h to use __system_property_wait_any() #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ #include #include "profile-extras.h" extern "C" { void __gcov_dump(void); void __gcov_reset(void); // storing SIG_ERR helps us detect (unlikely) looping. static sighandler_t chained_gcov_signal_handler = SIG_ERR; static void gcov_signal_handler(int signum) { __gcov_dump(); __gcov_reset(); if (chained_gcov_signal_handler != SIG_ERR && chained_gcov_signal_handler != SIG_IGN && chained_gcov_signal_handler != SIG_DFL) { (chained_gcov_signal_handler)(signum); } } __attribute__((weak)) int init_profile_extras_once = 0; // Initialize libprofile-extras: // - Install a signal handler that triggers __gcov_flush on . // // We want this initiazlier to run during load time. // // Just marking init_profile_extras() with __attribute__((constructor)) isn't // enough since the linker drops it from its output since no other symbol from // this static library is referenced. // // We force the linker to include init_profile_extras() by passing // '-uinit_profile_extras' to the linker (in build/soong). __attribute__((constructor)) int init_profile_extras(void) { if (init_profile_extras_once) return 0; init_profile_extras_once = 1; // is this instance already registered? if (chained_gcov_signal_handler != SIG_ERR) { return -1; } sighandler_t ret1 = signal(COVERAGE_FLUSH_SIGNAL, gcov_signal_handler); if (ret1 == SIG_ERR) { return -1; } chained_gcov_signal_handler = ret1; return 0; } }