| /* |
| * 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 <errno.h> |
| #include <pthread.h> |
| #include <signal.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <libgen.h> // For POSIX basename(). |
| |
| // Use _system_properties.h to use __system_property_wait_any() |
| #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ |
| #include <sys/_system_properties.h> |
| |
| #include "profile-extras.h" |
| |
| extern "C" { |
| |
| void __gcov_flush(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_flush(); |
| 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 <COVERAGE_FLUSH_SIGNAL>. |
| // |
| // 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; |
| } |
| } |