7add50d820
libmemunreachable uses an imprecise mark and sweep pass over all memory
allocated by jemalloc in order to find unreachable allocations.
Bug: 27208635
Change-Id: Ia70bbf31f5b40ff71dab28cfd6cd06c5ef01a2d4
(cherry picked from commit bcb4ed3eaa)
67 lines
1.9 KiB
C++
67 lines
1.9 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 <inttypes.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 <android-base/unique_fd.h>
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#include "LineBuffer.h"
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#include "ProcessMappings.h"
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#include "log.h"
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// This function is not re-entrant since it uses a static buffer for
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// the line data.
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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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int fd = open(map_buffer, O_RDONLY);
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if (fd < 0) {
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return false;
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}
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android::base::unique_fd fd_guard{fd};
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LineBuffer line_buf(fd, map_buffer, sizeof(map_buffer));
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char* line;
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size_t line_len;
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while (line_buf.GetLine(&line, &line_len)) {
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int name_pos;
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char perms[5];
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Mapping mapping{};
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if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4s %*x %*x:%*x %*d %n",
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&mapping.begin, &mapping.end, perms, &name_pos) == 3) {
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if (perms[0] == 'r') {
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mapping.read = true;
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}
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if (perms[1] == 'w') {
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mapping.write = true;
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}
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if (perms[2] == 'x') {
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mapping.execute = true;
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}
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if (perms[3] == 'p') {
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mapping.priv = true;
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}
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if ((size_t)name_pos < line_len) {
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strlcpy(mapping.name, line + name_pos, sizeof(mapping.name));
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}
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mappings.emplace_back(mapping);
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}
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}
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return true;
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}
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