// Polls for and processes events the specified joystick
//
static GLFWbool pollJoystickEvents(_GLFWjoystickLinux* js)
{
#if defined(__linux__)
ssize_t offset = 0;
char buffer[16384];
const ssize_t size = read(_glfw.linux_js.inotify, buffer, sizeof(buffer));
while (size > offset)
{
regmatch_t match;
const struct inotify_event* e = (struct inotify_event*) (buffer + offset);
if (regexec(&_glfw.linux_js.regex, e->name, 1, &match, 0) == 0)
{
char path[20];
snprintf(path, sizeof(path), "/dev/input/%s", e->name);
openJoystickDevice(path);
}
offset += sizeof(struct inotify_event) + e->len;
}
if (!js->present)
return GLFW_FALSE;
// Read all queued events (non-blocking)
for (;;)
{
struct js_event e;
errno = 0;
if (read(js->fd, &e, sizeof(e)) < 0)
{
// Reset the joystick slot if the device was disconnected
if (errno == ENODEV)
{
free(js->axes);
free(js->buttons);
free(js->name);
free(js->path);
memset(js, 0, sizeof(_GLFWjoystickLinux));
}
break;
}
// Clear the initial-state bit
e.type &= ~JS_EVENT_INIT;
if (e.type == JS_EVENT_AXIS)
js->axes[e.number] = (float) e.value / 32767.0f;
else if (e.type == JS_EVENT_BUTTON)
js->buttons[e.number] = e.value ? GLFW_PRESS : GLFW_RELEASE;
}
#endif // __linux__
return js->present;
}
int _glfwInitJoysticks(void)
{
#ifdef _GLFW_USE_LINUX_JOYSTICKS
int i, joy = 0;
regex_t regex;
DIR* dir;
const char* dirs[] =
{
"/dev/input",
"/dev"
};
if (regcomp(®ex, "^js[0-9]\\+$", 0) != 0)
{
_glfwSetError(GLFW_PLATFORM_ERROR, "X11: Failed to compile regex");
return GL_FALSE;
}
for (i = 0; i < sizeof(dirs) / sizeof(dirs[0]); i++)
{
struct dirent* entry;
dir = opendir(dirs[i]);
if (!dir)
continue;
while ((entry = readdir(dir)))
{
char path[20];
regmatch_t match;
if (regexec(®ex, entry->d_name, 1, &match, 0) != 0)
continue;
snprintf(path, sizeof(path), "%s/%s", dirs[i], entry->d_name);
if (openJoystickDevice(joy, path))
joy++;
}
closedir(dir);
}
regfree(®ex);
#endif // _GLFW_USE_LINUX_JOYSTICKS
return GL_TRUE;
}
void _glfwPollJoystickEvents(void)
{
#if defined(__linux__)
ssize_t offset = 0;
char buffer[16384];
const ssize_t size = read(_glfw.linux_js.inotify, buffer, sizeof(buffer));
while (size > offset)
{
regmatch_t match;
const struct inotify_event* e = (struct inotify_event*) (buffer + offset);
if (regexec(&_glfw.linux_js.regex, e->name, 1, &match, 0) == 0)
{
char path[20];
snprintf(path, sizeof(path), "/dev/input/%s", e->name);
openJoystickDevice(path);
}
offset += sizeof(struct inotify_event) + e->len;
}
#endif
}
// Initialize joystick interface
//
int _glfwInitJoysticks(void)
{
#if defined(__linux__)
const char* dirname = "/dev/input";
DIR* dir;
_glfw->linux_js.inotify = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
if (_glfw->linux_js.inotify == -1)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Linux: Failed to initialize inotify: %s",
strerror(errno));
return GL_FALSE;
}
// HACK: Register for IN_ATTRIB as well to get notified when udev is done
// This works well in practice but the true way is libudev
_glfw->linux_js.watch = inotify_add_watch(_glfw->linux_js.inotify,
dirname,
IN_CREATE | IN_ATTRIB);
if (_glfw->linux_js.watch == -1)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Linux: Failed to watch for joystick connections in %s: %s",
dirname,
strerror(errno));
// Continue without device connection notifications
}
if (regcomp(&_glfw->linux_js.regex, "^js[0-9]\\+$", 0) != 0)
{
_glfwInputError(GLFW_PLATFORM_ERROR, "Linux: Failed to compile regex");
return GL_FALSE;
}
dir = opendir(dirname);
if (dir)
{
struct dirent* entry;
while ((entry = readdir(dir)))
{
char path[20];
regmatch_t match;
if (regexec(&_glfw->linux_js.regex, entry->d_name, 1, &match, 0) != 0)
continue;
snprintf(path, sizeof(path), "%s/%s", dirname, entry->d_name);
openJoystickDevice(path);
}
closedir(dir);
}
else
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Linux: Failed to open joystick device directory %s: %s",
dirname,
strerror(errno));
// Continue with no joysticks detected
}
#endif // __linux__
return GL_TRUE;
}
// Polls for and processes events for all present joysticks
//
static void pollJoystickEvents(void)
{
#if defined(__linux__)
int i;
struct js_event e;
ssize_t offset = 0;
char buffer[16384];
const ssize_t size = read(_glfw->linux_js.inotify, buffer, sizeof(buffer));
while (size > offset)
{
regmatch_t match;
const struct inotify_event* e = (struct inotify_event*) (buffer + offset);
if (regexec(&_glfw->linux_js.regex, e->name, 1, &match, 0) == 0)
{
char path[20];
snprintf(path, sizeof(path), "/dev/input/%s", e->name);
openJoystickDevice(path);
}
offset += sizeof(struct inotify_event) + e->len;
}
for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
{
if (!_glfw->linux_js.js[i].present)
continue;
// Read all queued events (non-blocking)
for (;;)
{
errno = 0;
if (read(_glfw->linux_js.js[i].fd, &e, sizeof(e)) < 0)
{
if (errno == ENODEV)
{
// The joystick was disconnected
free(_glfw->linux_js.js[i].axes);
free(_glfw->linux_js.js[i].buttons);
free(_glfw->linux_js.js[i].name);
free(_glfw->linux_js.js[i].path);
memset(&_glfw->linux_js.js[i], 0, sizeof(_glfw->linux_js.js[i]));
}
break;
}
// We don't care if it's an init event or not
e.type &= ~JS_EVENT_INIT;
switch (e.type)
{
case JS_EVENT_AXIS:
_glfw->linux_js.js[i].axes[e.number] =
(float) e.value / 32767.0f;
break;
case JS_EVENT_BUTTON:
_glfw->linux_js.js[i].buttons[e.number] =
e.value ? GLFW_PRESS : GLFW_RELEASE;
break;
default:
break;
}
}
}
#endif // __linux__
}