70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <android/set_abort_message.h>
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#include <pthread.h>
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#include <string.h>
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#include <sys/mman.h>
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#include "private/ScopedPthreadMutexLocker.h"
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static pthread_mutex_t g_abort_msg_lock = PTHREAD_MUTEX_INITIALIZER;
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struct abort_msg_t {
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size_t size;
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char msg[0];
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};
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abort_msg_t** __abort_message_ptr; // Accessible to __libc_init_common.
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void android_set_abort_message(const char* msg) {
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ScopedPthreadMutexLocker locker(&g_abort_msg_lock);
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if (__abort_message_ptr == nullptr) {
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// We must have crashed _very_ early.
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return;
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}
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if (*__abort_message_ptr != nullptr) {
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// We already have an abort message.
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// Assume that the first crash is the one most worth reporting.
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return;
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}
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size_t size = sizeof(abort_msg_t) + strlen(msg) + 1;
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void* map = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
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if (map == MAP_FAILED) {
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return;
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}
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abort_msg_t* new_abort_message = reinterpret_cast<abort_msg_t*>(map);
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new_abort_message->size = size;
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strcpy(new_abort_message->msg, msg);
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*__abort_message_ptr = new_abort_message;
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}
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