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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <functional>
#include <string>
#include <android-base/file.h>
namespace android {
namespace procinfo {
template <class CallbackType>
bool ReadMapFileContent(char* content, const CallbackType& callback) {
uint64_t start_addr;
uint64_t end_addr;
uint16_t flags;
uint64_t pgoff;
char* next_line = content;
char* p;
auto pass_space = [&]() {
if (*p != ' ') {
return false;
}
while (*p == ' ') {
p++;
}
return true;
};
auto pass_xdigit = [&]() {
if (!isxdigit(*p)) {
return false;
}
do {
p++;
} while (isxdigit(*p));
return true;
};
while (next_line != nullptr && *next_line != '\0') {
p = next_line;
next_line = strchr(next_line, '\n');
if (next_line != nullptr) {
*next_line = '\0';
next_line++;
}
// Parse line like: 00400000-00409000 r-xp 00000000 fc:00 426998 /usr/lib/gvfs/gvfsd-http
char* end;
// start_addr
start_addr = strtoull(p, &end, 16);
if (end == p || *end != '-') {
return false;
}
p = end + 1;
// end_addr
end_addr = strtoull(p, &end, 16);
if (end == p) {
return false;
}
p = end;
if (!pass_space()) {
return false;
}
// flags
flags = 0;
if (*p == 'r') {
flags |= PROT_READ;
} else if (*p != '-') {
return false;
}
p++;
if (*p == 'w') {
flags |= PROT_WRITE;
} else if (*p != '-') {
return false;
}
p++;
if (*p == 'x') {
flags |= PROT_EXEC;
} else if (*p != '-') {
return false;
}
p++;
if (*p != 'p' && *p != 's') {
return false;
}
p++;
if (!pass_space()) {
return false;
}
// pgoff
pgoff = strtoull(p, &end, 16);
if (end == p) {
return false;
}
p = end;
if (!pass_space()) {
return false;
}
// major:minor
if (!pass_xdigit() || *p++ != ':' || !pass_xdigit() || !pass_space()) {
return false;
}
// inode
if (!pass_xdigit() || (*p != '\0' && !pass_space())) {
return false;
}
// filename
callback(start_addr, end_addr, flags, pgoff, p);
}
return true;
}
inline bool ReadMapFile(
const std::string& map_file,
const std::function<void(uint64_t, uint64_t, uint16_t, uint64_t, const char*)>& callback) {
std::string content;
if (!android::base::ReadFileToString(map_file, &content)) {
return false;
}
return ReadMapFileContent(&content[0], callback);
}
inline bool ReadProcessMaps(
pid_t pid,
const std::function<void(uint64_t, uint64_t, uint16_t, uint64_t, const char*)>& callback) {
return ReadMapFile("/proc/" + std::to_string(pid) + "/maps", callback);
}
} /* namespace procinfo */
} /* namespace android */
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