3841accba8
Add test and benchmark. Also switch libbacktrace, libunwindstack, libmemunreachable to use libprocinfo for map file reading. The benchmark shows using libprocinfo speeds up map file reading in libbacktrace and libunwindstack 18% - 36% on walleye. Bug: http://b/79118393 Test: run procinfo_test. Test: run libunwindstack_test. Test: run libbacktrace_test. Test: run memunreachable_test. Change-Id: Icf281c352f4103fc8d4ba6732c5c07b943330ca1
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
/*
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* Copyright (C) 2016 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 <fcntl.h>
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#include <inttypes.h>
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#include <string.h>
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#include <unistd.h>
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#include <android-base/unique_fd.h>
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#include <procinfo/process_map.h>
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#include "ProcessMappings.h"
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namespace android {
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struct ReadMapCallback {
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ReadMapCallback(allocator::vector<Mapping>& mappings) : mappings_(mappings) {}
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void operator()(uint64_t start, uint64_t end, uint16_t flags, uint64_t, const char* name) const {
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mappings_.emplace_back(start, end, flags & PROT_READ, flags & PROT_WRITE, flags & PROT_EXEC,
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name);
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}
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allocator::vector<Mapping>& mappings_;
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};
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bool ProcessMappings(pid_t pid, allocator::vector<Mapping>& mappings) {
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char map_buffer[1024];
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snprintf(map_buffer, sizeof(map_buffer), "/proc/%d/maps", pid);
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android::base::unique_fd fd(open(map_buffer, O_RDONLY));
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if (fd == -1) {
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return false;
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}
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allocator::string content(mappings.get_allocator());
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ssize_t n;
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while ((n = TEMP_FAILURE_RETRY(read(fd, map_buffer, sizeof(map_buffer)))) > 0) {
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content.append(map_buffer, n);
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}
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ReadMapCallback callback(mappings);
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return android::procinfo::ReadMapFileContent(&content[0], callback);
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}
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} // namespace android
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