98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
/*
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* Copyright (C) 2019 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 <procinfo/process_map.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <procinfo/process.h>
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namespace android {
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namespace procinfo {
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bool ReadMapFileAsyncSafe(const char* map_file, void* buffer, size_t buffer_size,
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const std::function<void(uint64_t, uint64_t, uint16_t, uint64_t, ino_t,
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const char*)>& callback) {
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if (buffer == nullptr || buffer_size == 0) {
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return false;
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}
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int fd = open(map_file, O_RDONLY | O_CLOEXEC);
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if (fd == -1) {
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return false;
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}
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char* char_buffer = reinterpret_cast<char*>(buffer);
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size_t start = 0;
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size_t read_bytes = 0;
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char* line = nullptr;
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bool read_complete = false;
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while (true) {
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ssize_t bytes =
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TEMP_FAILURE_RETRY(read(fd, char_buffer + read_bytes, buffer_size - read_bytes - 1));
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if (bytes <= 0) {
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if (read_bytes == 0) {
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close(fd);
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return bytes == 0;
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}
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// Treat the last piece of data as the last line.
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char_buffer[start + read_bytes] = '\n';
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bytes = 1;
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read_complete = true;
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}
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read_bytes += bytes;
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while (read_bytes > 0) {
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char* newline = reinterpret_cast<char*>(memchr(&char_buffer[start], '\n', read_bytes));
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if (newline == nullptr) {
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break;
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}
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*newline = '\0';
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line = &char_buffer[start];
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start = newline - char_buffer + 1;
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read_bytes -= newline - line + 1;
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// Ignore the return code, errors are okay.
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ReadMapFileContent(line, callback);
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}
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if (read_complete) {
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close(fd);
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return true;
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}
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if (start == 0 && read_bytes == buffer_size - 1) {
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// The buffer provided is too small to contain this line, give up
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// and indicate failure.
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close(fd);
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return false;
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}
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// Copy any leftover data to the front of the buffer.
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if (start > 0) {
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if (read_bytes > 0) {
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memmove(char_buffer, &char_buffer[start], read_bytes);
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}
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start = 0;
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}
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}
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}
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} /* namespace procinfo */
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} /* namespace android */
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