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60 lines
1.7 KiB
60 lines
1.7 KiB
4 months ago
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/*
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* Copyright (C) 2020 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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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include "profile-extras.h"
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extern "C" {
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static sighandler_t chained_signal_handler = SIG_ERR;
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int __llvm_profile_write_file(void);
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static void llvm_signal_handler(__unused int signum) {
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__llvm_profile_write_file();
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if (chained_signal_handler != SIG_ERR &&
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chained_signal_handler != SIG_IGN &&
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chained_signal_handler != SIG_DFL) {
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(chained_signal_handler)(signum);
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}
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}
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// Initialize libprofile-extras:
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//
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// - Install a signal handler that triggers __llvm_profile_write_file on
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// <COVERAGE_FLUSH_SIGNAL>.
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//
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// We want this initializer to run during load time. In addition to marking
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// this function as a constructor, we link this library with `--whole-archive`
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// to force this function to be included in the output.
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static __attribute__((constructor)) int init_profile_extras(void) {
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if (chained_signal_handler != SIG_ERR) {
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return -1;
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}
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sighandler_t ret1 = signal(COVERAGE_FLUSH_SIGNAL, llvm_signal_handler);
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if (ret1 == SIG_ERR) {
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return -1;
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}
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chained_signal_handler = ret1;
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return 0;
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}
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}
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