initialize the project

Author: yehuthi

.gitignore

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+build/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1...3.28)
+project(LinuxFlip VERSION 0.1)
+
+find_package(PkgConfig REQUIRED)
+pkg_search_module(LIBINPUT REQUIRED libinput)
+pkg_search_module(LIBUDEV REQUIRED libudev)
+
+add_executable(linuxflip main.c)
+target_include_directories(linuxflip PRIVATE ${LIBINPUT_INCLUDE_DIRS} ${LIBUDEV_INCLUDE_DIRS})
+target_link_libraries(linuxflip ${LIBINPUT_LIBRARIES} ${LIBUDEV_LIBRARIES})

README.md

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+# Linux Flip

main.c

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+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <libinput.h>
+#include <libudev.h>
+#include <fcntl.h>
+#include <poll.h>
+
+static int open_restricted(const char *path, int flags, void *user_data) {
+	int fd = open(path, flags);
+	return fd < 0 ? -errno : fd;
+}
+
+static void close_restricted(int fd, void *user_data) {
+	close(fd);
+}
+
+int main() {
+	if (geteuid()) {
+		fprintf(stderr, "Error: this utility requires root privileges (did you forget `sudo`?)\n");
+		return 1;
+	}
+
+	const static struct libinput_interface file_open_close = {
+		.open_restricted = open_restricted,
+		.close_restricted = close_restricted,
+	};
+
+	struct udev *udev = udev_new();
+	struct libinput *li = libinput_udev_create_context(&file_open_close, 0, udev);
+
+	libinput_udev_assign_seat(li, "seat0");
+
+	struct libinput_event *event;
+
+	// Exhaust open device events
+	libinput_dispatch(li);
+	while ((event = libinput_get_event(li))) libinput_event_destroy(event);
+
+	struct pollfd pollfd = {
+		.fd = libinput_get_fd(li),
+		.events = POLLIN,
+		.revents = 0
+	};
+
+	while(poll(&pollfd, 1, -1)) {
+		libinput_dispatch(li);
+		while ((event = libinput_get_event(li))) {
+			if (libinput_event_get_type(event) != LIBINPUT_EVENT_SWITCH_TOGGLE) continue;
+			struct libinput_event_switch *switch_event = libinput_event_get_switch_event(event);
+			if (libinput_event_switch_get_switch(switch_event) != LIBINPUT_SWITCH_TABLET_MODE) continue;
+			const char switch_on = libinput_event_switch_get_switch_state(switch_event) == LIBINPUT_SWITCH_STATE_ON;
+			printf("%s\n", switch_on ? "TABLET" : "LAPTOP");
+			libinput_event_destroy(event);
+		}
+	}
+
+	libinput_unref(li);
+	udev_unref(udev);
+	return 0;
+}