1/*
 2 * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
 3 *
 4 * Permission to use, copy, modify, and distribute this software for any
 5 * purpose with or without fee is hereby granted, provided that the above
 6 * copyright notice and this permission notice appear in all copies.
 7 *
 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16// Test that values in /proc/uptime increment monotonically.
17#undef NDEBUG
18#include <assert.h>
19#include <stdint.h>
20#include <sys/types.h>
21#include <sys/stat.h>
22#include <fcntl.h>
23
24#include "proc-uptime.h"
25
26int main(void)
27{
28	uint64_t start, u0, u1, i0, i1;
29	int fd;
30
31	fd = open("/proc/uptime", O_RDONLY);
32	assert(fd >= 0);
33
34	proc_uptime(fd, &u0, &i0);
35	start = u0;
36	do {
37		proc_uptime(fd, &u1, &i1);
38		assert(u1 >= u0);
39		assert(i1 >= i0);
40		u0 = u1;
41		i0 = i1;
42	} while (u1 - start < 100);
43
44	return 0;
45}