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/*
* Copyright (C) 2020 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 <signal.h>
#include <stdlib.h>
#include "profile-extras.h"
extern "C" {
static sighandler_t chained_signal_handler = SIG_ERR;
int __llvm_profile_write_file(void);
static void llvm_signal_handler(__unused int signum) {
__llvm_profile_write_file();
if (chained_signal_handler != SIG_ERR &&
chained_signal_handler != SIG_IGN &&
chained_signal_handler != SIG_DFL) {
(chained_signal_handler)(signum);
}
}
__attribute__((weak)) int init_profile_extras_once = 0;
// Initialize libprofile-extras:
// - Install a signal handler that triggers __llvm_profile_write_file on <COVERAGE_FLUSH_SIGNAL>.
//
// We want this initializer 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;
if (chained_signal_handler != SIG_ERR) {
return -1;
}
sighandler_t ret1 = signal(COVERAGE_FLUSH_SIGNAL, llvm_signal_handler);
if (ret1 == SIG_ERR) {
return -1;
}
chained_signal_handler = ret1;
return 0;
}
}
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