+// _ _ ____ _ _
+// ___| |_ _ __ _ _ ___| |_ | _ \ ___ | | | ___ _ __
+// / __| __| '__| | | |/ __| __| | |_) / _ \| | |/ _ \ '__|
+// \__ \ |_| | | |_| | (__| |_ | __/ (_) | | | __/ |
+// |___/\__|_| \__,_|\___|\__| |_| \___/|_|_|\___|_|
+//
+struct Poller {
+ std::vector<std::function<int(int)>> handlers;
+ std::vector<struct pollfd> pfds;
+
+ Poller() = default;
+ void add_fd(int fd, std::function<int(int)> handler);
+ int check_events();
+};
+
+void Poller::add_fd(int fd, std::function<int(int)> handler) {
+ pfds.emplace_back(pollfd{ .fd = fd, .events = POLLIN, .revents = 0 });
+ handlers.emplace_back(std::move(handler));
+}
+
+int Poller::check_events() {
+ int ret = 0;
+ if ((ret = poll(this->pfds.data(), this->pfds.size(), -1)) != -1 && errno != EINTR) {
+ for (unsigned i = 0; i < pfds.size(); i++) {
+ if (pfds[i].revents & POLLIN) {
+ if (handlers[i](pfds[i].fd) == -1) {
+ return -1;
+ }
+ pfds[i].revents = 0;
+ pfds[i].events = POLLIN;
+ }
+ }
+ }
+ return ret;
+}
+