client.c

static void client_sigwinch_handler(int sig) {
	client.need_resize = true;
}

static bool client_send_packet(Packet *pkt) {
	print_packet("client-send:", pkt);
	if (send_packet(server.socket, pkt))
		return true;
	debug("FAILED\n");
	server.running = false;
	return false;
}

static bool client_recv_packet(Packet *pkt) {
	if (recv_packet(server.socket, pkt)) {
		print_packet("client-recv:", pkt);
		return true;
	}
	debug("client-recv: FAILED\n");
	server.running = false;
	return false;
}

static void client_restore_terminal(void) {
	if (!has_term)
		return;
	tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_term);
	if (alternate_buffer) {
		printf("\033[?25h\033[?1049l");
		fflush(stdout);
		alternate_buffer = false;
	}
}

static void client_setup_terminal(void) {
	if (!has_term)
		return;
	atexit(client_restore_terminal);

	cur_term = orig_term;
	cur_term.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IXOFF);
	cur_term.c_oflag &= ~(OPOST);
	cur_term.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
	cur_term.c_cflag &= ~(CSIZE|PARENB);
	cur_term.c_cflag |= CS8;
	cur_term.c_cc[VLNEXT] = _POSIX_VDISABLE;
	cur_term.c_cc[VMIN] = 1;
	cur_term.c_cc[VTIME] = 0;
	tcsetattr(STDIN_FILENO, TCSANOW, &cur_term);

	if (!alternate_buffer) {
		printf("\033[?1049h\033[H");
		fflush(stdout);
		alternate_buffer = true;
	}
}

static int client_mainloop(void) {
	sigset_t emptyset, blockset;
	sigemptyset(&emptyset);
	sigemptyset(&blockset);
	sigaddset(&blockset, SIGWINCH);
	sigprocmask(SIG_BLOCK, &blockset, NULL);

	client.need_resize = true;
	Packet pkt = {
		.type = MSG_ATTACH,
		.u.i = client.flags,
		.len = sizeof(pkt.u.i),
	};
	client_send_packet(&pkt);

	while (server.running) {
		fd_set fds;
		FD_ZERO(&fds);
		FD_SET(STDIN_FILENO, &fds);
		FD_SET(server.socket, &fds);

		if (client.need_resize) {
			struct winsize ws;
			if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) != -1) {
				Packet pkt = {
					.type = MSG_RESIZE,
					.u = { .ws = { .rows = ws.ws_row, .cols = ws.ws_col } },
					.len = sizeof(pkt.u.ws),
				};
				if (client_send_packet(&pkt))
					client.need_resize = false;
			}
		}

		if (pselect(server.socket+1, &fds, NULL, NULL, NULL, &emptyset) == -1) {
			if (errno == EINTR)
				continue;
			die("client-mainloop");
		}

		if (FD_ISSET(server.socket, &fds)) {
			Packet pkt;
			if (client_recv_packet(&pkt)) {
				switch (pkt.type) {
				case MSG_CONTENT:
					if (!passthrough)
						write_all(STDOUT_FILENO, pkt.u.msg, pkt.len);
					break;
				case MSG_RESIZE:
					client.need_resize = true;
					break;
				case MSG_EXIT:
					client_send_packet(&pkt);
					close(server.socket);
					return pkt.u.i;
				}
			}
		}

		if (FD_ISSET(STDIN_FILENO, &fds)) {
			Packet pkt = { .type = MSG_CONTENT };
			ssize_t len = read(STDIN_FILENO, pkt.u.msg, sizeof(pkt.u.msg));
			if (len == -1 && errno != EAGAIN && errno != EINTR)
				die("client-stdin");
			if (len > 0) {
				debug("client-stdin: %c\n", pkt.u.msg[0]);
				pkt.len = len;
				if (KEY_REDRAW && pkt.u.msg[0] == KEY_REDRAW) {
					client.need_resize = true;
				} else if (pkt.u.msg[0] == KEY_DETACH) {
					pkt.type = MSG_DETACH;
					pkt.len = 0;
					client_send_packet(&pkt);
					close(server.socket);
					return -1;
				} else if (!(client.flags & CLIENT_READONLY)) {
					client_send_packet(&pkt);
				}
			} else if (len == 0) {
				debug("client-stdin: EOF\n");
				return -1;
			}
		}
	}

	return -EIO;
}