seatd/common/drm.c

#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>

#if defined(__linux__)
#include <sys/sysmacros.h>
#endif

#include "compiler.h"
#include "drm.h"

// From libdrm
#define DRM_IOCTL_BASE	      'd'
#define DRM_IO(nr)	      _IO(DRM_IOCTL_BASE, nr)
#define DRM_IOCTL_SET_MASTER  DRM_IO(0x1e)
#define DRM_IOCTL_DROP_MASTER DRM_IO(0x1f)

int drm_set_master(int fd) {
	return ioctl(fd, DRM_IOCTL_SET_MASTER, 0);
}

int drm_drop_master(int fd) {
	return ioctl(fd, DRM_IOCTL_DROP_MASTER, 0);
}

static int path_is_drm_card(const char *path) {
	static const char prefix[] = "/dev/dri/card";
	static const int prefixlen = STRLEN(prefix);
	return strncmp(prefix, path, prefixlen) == 0;
}

static int path_is_drm_render(const char *path) {
	static const char prefix[] = "/dev/dri/renderD";
	static const int prefixlen = STRLEN(prefix);
	return strncmp(prefix, path, prefixlen) == 0;
}

int path_is_drm(const char *path) {
	return path_is_drm_card(path) || path_is_drm_render(path);
}

#if defined(__linux__)
int dev_is_drm(dev_t device) {
	return major(device) == 226;
}
#endif