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udevconnection.h
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udevconnection.h
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#pragma once
#include <string>
#include <algorithm>
#include <filesystem>
extern "C" {
#include <libudev.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
}
#include "onreturn.h"
#include "utils.h"
struct UdevConnection {
UdevConnection()
{
context = udev_new();
if (!context) {
fprintf(stderr, "Failed to connect to udev\n");
return;
}
udevMonitor = udev_monitor_new_from_netlink(context, "udev");
if (!udevMonitor) {
fprintf(stderr, "Failed to create udev monitor\n");
return;
}
udev_monitor_filter_add_match_subsystem_devtype(udevMonitor, "input", 0);
udev_monitor_enable_receiving(udevMonitor);
udevSocketFd = udev_monitor_get_fd(udevMonitor);
udevAvailable = true;
init();
}
static std::string devicePath(udev_device *dev)
{
std::string linkPath;
const std::string sysName = std_sux::string(udev_device_get_property_value(dev, "DEVNAME"));
if (!sysName.empty()) {
linkPath = sysName;
} else {
if (s_verbose) puts("Falling back");
udev_list_entry *devLink= udev_device_get_devlinks_list_entry(dev);
if (!devLink) {
return {};
}
linkPath = std_sux::string(udev_list_entry_get_name(devLink));
}
return linkPath;
}
std::string addKeyboard(udev_device *dev)
{
const std::string id = udev_device_get_devpath(dev);
const std::string isKeyboard = std_sux::string(udev_device_get_property_value(dev, "ID_INPUT_KEYBOARD"));
const std::string isKey = std_sux::string(udev_device_get_property_value(dev, "ID_INPUT_KEY"));
if (isKeyboard != "1" && isKey != "1") {
if (s_verbose) fprintf(stderr, "!!!!!!!! Skipping non-keyboard %s\n", id.c_str());
if (s_veryVerbose) printProperties(dev);
if (s_verbose) fprintf(stderr, " -------------\n");
return "";
}
// It's a list entry, but we only need one
std::string linkPath = devicePath(dev);
if (linkPath.empty() || !std::filesystem::exists(linkPath)) {
if (s_verbose) fprintf(stderr, "Skipping device not in /dev: %s (%s)\n", id.c_str(), linkPath.c_str());
if (s_veryVerbose) printProperties(dev);
return "";
}
// Not initialized yet
if (!udev_device_get_is_initialized(dev)) {
if (s_verbose) printf("%s not initialized yet\n", linkPath.c_str());
return "";
}
if (keyboardPaths.count(id) != 0) {
if (s_verbose) printf("%s already added\n", linkPath.c_str());
return "";
}
if (s_verbose) fprintf(stdout, "Found keyboard: %s: %s\n", id.c_str(), linkPath.c_str());
if (s_veryVerbose) printProperties(dev);
keyboardPaths[id] = linkPath;
return linkPath;
}
void init()
{
udev_enumerate *enumerate = udev_enumerate_new(context);
udev_enumerate_add_match_subsystem(enumerate, "input");
udev_enumerate_scan_devices(enumerate);
udev_list_entry *devices = udev_enumerate_get_list_entry(enumerate);
udev_list_entry *entry = nullptr;
udev_list_entry_foreach(entry, devices) {
const char *path = udev_list_entry_get_name(entry);
if (!path) {
fprintf(stderr, "Invalid device when listing\n");
continue;
}
udev_device *dev = udev_device_new_from_syspath(context, path);
if (!dev) {
fprintf(stderr, "failed getting %s\n", path);
continue;
}
addKeyboard(dev);
udev_device_unref(dev);
}
udev_enumerate_unref(enumerate);
if (s_verbose) printf("Got %ld keyboards\n", keyboardPaths.size());
}
~UdevConnection()
{
if (udevMonitor) {
udev_monitor_unref(udevMonitor);
}
if (context) {
udev_unref(context);
}
}
void printProperties(udev_device *dev)
{
fprintf(stderr, "sysname: %s\n", udev_device_get_sysname(dev));
udev_list_entry *entry = udev_device_get_properties_list_entry(dev);
while (entry) {
const char *name = udev_list_entry_get_name(entry);
const char *value = udev_list_entry_get_value(entry);
fprintf(stderr, "property name: %s value %s\n", name, value);
entry = udev_list_entry_get_next(entry);
}
}
enum UpdateResult {
NoUpdate,
KeyboardAdded,
KeyboardRemoved
};
UpdateResult update(std::string *keyboardPath)
{
if (!udevAvailable) {
fprintf(stderr, "udev unavailable\n");
return NoUpdate;
}
udev_device *dev = udev_monitor_receive_device(udevMonitor);
OnReturn releaseDev([&]() {
udev_device_unref(dev);
});
const std::string id = udev_device_get_devpath(dev);
const std::string action = udev_device_get_action(dev);
if (s_verbose) printf("udev action: %s for id %s\n", action.c_str(), id.c_str());
if (action == "remove" || action == "offline") {
if (!keyboardPaths.contains(id)) {
return NoUpdate;
}
*keyboardPath = keyboardPaths[id];
keyboardPaths.erase(id);
return KeyboardRemoved;
}
std::string path = addKeyboard(dev);
if (!path.empty()) {
*keyboardPath = path;
return KeyboardAdded;
}
return NoUpdate;
}
udev *context = nullptr;
udev_monitor *udevMonitor = nullptr;
bool udevAvailable = false;
int udevSocketFd = -1;
std::unordered_map<std::string, std::string> keyboardPaths;
};