/*
 * Copyright © 2014 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Daniel Vetter <daniel.vetter@ffwll.ch>
 *
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <fcntl.h>
#include <limits.h>
#include "drmtest.h"


#define FD_ARR_SZ 100
int fd_arr[FD_ARR_SZ];

igt_simple_main
{
	int fd, i;
	struct rlimit rlim;
	unsigned nofile_rlim;
	FILE *file_max = fopen("/proc/sys/fs/file-max", "r");
	igt_assert(fscanf(file_max, "%u", &nofile_rlim) == 1);
	fclose(file_max);

	printf("System limit for open files is %u\n", nofile_rlim);

	igt_assert(getrlimit(RLIMIT_NOFILE, &rlim) == 0);
	rlim.rlim_cur = nofile_rlim;
	rlim.rlim_max = nofile_rlim;
	igt_assert(setrlimit(RLIMIT_NOFILE, &rlim) == 0);

	fd = drm_open_any();

	igt_assert(open("/dev/null", O_RDONLY) >= 0);

	for (i = 0; ; i++) {
		int tmp_fd = open("/dev/null", O_RDONLY);
		uint32_t handle;

		if (tmp_fd >= 0 && i < FD_ARR_SZ)
			fd_arr[i] = tmp_fd;

		handle = gem_create(fd, 4096);
		if (handle)
			gem_close(fd, handle);


		if (!handle || tmp_fd < 0) {
			printf("fd exhaustion after %i rounds.\n", i);
			break;
		}
	}

	/* free a few fd so that the exit handlers can at least run. */
	for (i = 0; i < FD_ARR_SZ; i++)
		close(fd_arr[i]);

	close(fd);
}