json.c

#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <unistd.h>

#include <json_object.h>
#include <xf86drm.h>
#include <xf86drmMode.h>

#include "drm_info.h"
#include "tables.h"

static const struct {
	const char *name;
	uint64_t cap;
} client_caps[] = {
	{ "STEREO_3D", DRM_CLIENT_CAP_STEREO_3D },
	{ "UNIVERSAL_PLANES", DRM_CLIENT_CAP_UNIVERSAL_PLANES },
	{ "ATOMIC", DRM_CLIENT_CAP_ATOMIC },
	{ "ASPECT_RATIO", DRM_CLIENT_CAP_ASPECT_RATIO },
	{ "WRITEBACK_CONNECTORS", DRM_CLIENT_CAP_WRITEBACK_CONNECTORS },
	{ "CURSOR_PLANE_HOTSPOT", DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT },
};

static const struct {
	const char *name;
	uint64_t cap;
} caps[] = {
	{ "DUMB_BUFFER", DRM_CAP_DUMB_BUFFER },
	{ "VBLANK_HIGH_CRTC", DRM_CAP_VBLANK_HIGH_CRTC },
	{ "DUMB_PREFERRED_DEPTH", DRM_CAP_DUMB_PREFERRED_DEPTH },
	{ "DUMB_PREFER_SHADOW", DRM_CAP_DUMB_PREFER_SHADOW },
	{ "PRIME", DRM_CAP_PRIME },
	{ "TIMESTAMP_MONOTONIC", DRM_CAP_TIMESTAMP_MONOTONIC },
	{ "ASYNC_PAGE_FLIP", DRM_CAP_ASYNC_PAGE_FLIP },
	{ "CURSOR_WIDTH", DRM_CAP_CURSOR_WIDTH },
	{ "CURSOR_HEIGHT", DRM_CAP_CURSOR_HEIGHT },
	{ "ADDFB2_MODIFIERS", DRM_CAP_ADDFB2_MODIFIERS },
	{ "PAGE_FLIP_TARGET", DRM_CAP_PAGE_FLIP_TARGET },
	{ "CRTC_IN_VBLANK_EVENT", DRM_CAP_CRTC_IN_VBLANK_EVENT },
	{ "SYNCOBJ", DRM_CAP_SYNCOBJ },
	{ "SYNCOBJ_TIMELINE", DRM_CAP_SYNCOBJ_TIMELINE },
	{ "ATOMIC_ASYNC_PAGE_FLIP", DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP },
};

static struct json_object *tainted_info(void)
{
#ifndef __linux__
	return NULL;
#endif

	FILE *f = fopen("/proc/sys/kernel/tainted", "r");
	if (f == NULL) {
		perror("fopen(/proc/sys/kernel/tainted)");
		return NULL;
	}

	char str[64];
	size_t n = fread(str, 1, sizeof(str) - 1, f);
	if (!feof(f)) {
		fclose(f);
		fprintf(stderr, "fread(/proc/sys/kernel/tainted) failed");
		return NULL;