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#include "common.hh"
#include "io.hh"
#include "looper.hh"
#include "signal_handler.hh"
#include "unique_pipe.hh"
#include <signal.h>
#include <unordered_map>
namespace {
std::unordered_map<int, int> g_fds;
int signum(SignalHandler::Signal signal) {
switch (signal) {
case SignalHandler::Signal::INT:
return SIGINT;
case SignalHandler::Signal::TERM:
return SIGTERM;
case SignalHandler::Signal::HUP:
return SIGHUP;
}
assert(false);
return 0;
}
void signal_handler(int signum) {
auto it = g_fds.find(signum);
if (it != g_fds.end()) {
char c = 1;
io::write(it->second, &c, 1);
}
}
class SignalHandlerImpl : public SignalHandler {
public:
SignalHandlerImpl(std::shared_ptr<Looper> looper, Signal signal,
std::function<void()> callback)
: looper_(looper), signal_(signum(signal)), callback_(std::move(callback)) {
looper_->add(pipe_.reader(), Looper::EVENT_READ,
std::bind(&SignalHandlerImpl::call, this,
std::placeholders::_1));
g_fds[signal_] = pipe_.writer();
::signal(signal_, signal_handler);
}
~SignalHandlerImpl() {
signal(signal_, SIG_DFL);
looper_->remove(pipe_.reader());
g_fds.erase(signal_);
}
private:
void call(uint8_t) {
char buf[10];
io::read(pipe_.reader(), buf, 10);
callback_();
}
unique_pipe pipe_;
std::shared_ptr<Looper> looper_;
int signal_;
std::function<void()> callback_;
};
} // namespace
std::unique_ptr<SignalHandler> SignalHandler::create(
std::shared_ptr<Looper> looper, Signal signal,
std::function<void()> callback) {
return std::make_unique<SignalHandlerImpl>(
std::move(looper), signal, std::move(callback));
}
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