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#include "memory/maps.hh"
namespace memory {
static std::string get_pid_from_name(const std::string& name) {
for (const auto& pid : std::filesystem::directory_iterator("/proc")) {
if (!pid.is_directory()) {
continue;
}
std::ifstream file{std::string{pid.path()} + "/comm"};
if (!file.is_open()) {
continue;
}
const std::string contents{std::istreambuf_iterator<char>{file},
std::istreambuf_iterator<char>{}};
if (!contents.starts_with(name)) {
continue;
}
const std::string pathname = pid.path();
const auto pos = static_cast<long>(pathname.find_last_of('/'));
return {std::next(std::begin(pathname) + pos), std::end(pathname)};
}
throw std::runtime_error{"failed to get pid from name \"" + name +
"\", is it open?"};
}
maps::maps(const char* const name) : pid(get_pid_from_name(name)) {
std::ifstream file{"/proc/" + this->pid + "/maps"};
if (!file.is_open()) {
throw std::runtime_error{"failed to open maps for pid \"" + this->pid +
'\"'};
}
std::stringstream file_ss;
file_ss << file.rdbuf();
for (std::string line; std::getline(file_ss, line);) {
if (line.empty()) {
continue;
}
std::stringstream line_ss{line};
// address perms offset dev inode pathname
// 00400000-00452000 r-xp 00000000 08:02 173521 /usr/bin/dbus-daemon
maps::region region;
line_ss >> region.start;
line_ss.ignore(); // ignore dash
line_ss >> region.end;
line_ss >> region.perms;
line_ss >> region.offset;
line_ss >> region.dev;
line_ss >> region.inode;
line_ss >> region.pathname;
this->regions.push_back(std::move(region));
}
}
} // namespace memory
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