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#include "signals.hh"
#include "looper.hh"
#include "unique_pipe.hh"
#include <cerrno>
#include <csignal>
#include <cstdint>
#include <functional>
#include <memory>
#include <unistd.h>
#include <unordered_map>
#include <utility>
namespace signals {
namespace {
std::unordered_map<int, int> g_fds;
int signum(Signal signal) {
switch (signal) {
case Signal::INT:
return SIGINT;
case Signal::TERM:
return SIGTERM;
}
std::unreachable();
}
void signal_handler(int signum) {
auto it = g_fds.find(signum);
if (it != g_fds.end()) {
char c = 1;
while (true) {
auto ret = write(it->second, &c, 1);
if (ret < 0 && errno == EINTR)
continue;
break;
}
}
}
class HandlerImpl : public Handler {
public:
HandlerImpl(looper::Looper& looper, Signal signal,
std::function<void()> callback)
: looper_(looper),
signal_(signum(signal)),
callback_(std::move(callback)) {
looper_.add(pipe_.reader(), looper::EVENT_READ,
[this](auto event) { call(event); });
g_fds[signal_] = pipe_.writer();
::signal(signal_, signal_handler);
}
~HandlerImpl() override {
::signal(signal_, SIG_DFL);
looper_.remove(pipe_.reader());
g_fds.erase(signal_);
}
private:
void call(uint8_t /* event */) {
char buf[10];
while (true) {
auto ret = read(pipe_.reader(), buf, 10);
if (ret < 0 && errno == EINTR)
continue;
break;
}
callback_();
}
unique_pipe pipe_;
looper::Looper& looper_;
int signal_;
std::function<void()> callback_;
};
} // namespace
std::unique_ptr<Handler> Handler::create(looper::Looper& looper, Signal signal,
std::function<void()> callback) {
return std::make_unique<HandlerImpl>(looper, signal, std::move(callback));
}
} // namespace signals
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