1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Permission to use, copy, modify, and distribute this software for any
5*4882a593Smuzhiyun * purpose with or without fee is hereby granted, provided that the above
6*4882a593Smuzhiyun * copyright notice and this permission notice appear in all copies.
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9*4882a593Smuzhiyun * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10*4882a593Smuzhiyun * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11*4882a593Smuzhiyun * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12*4882a593Smuzhiyun * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13*4882a593Smuzhiyun * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14*4882a593Smuzhiyun * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15*4882a593Smuzhiyun */
16*4882a593Smuzhiyun // Test that values in /proc/uptime increment monotonically.
17*4882a593Smuzhiyun #undef NDEBUG
18*4882a593Smuzhiyun #include <assert.h>
19*4882a593Smuzhiyun #include <stdint.h>
20*4882a593Smuzhiyun #include <sys/types.h>
21*4882a593Smuzhiyun #include <sys/stat.h>
22*4882a593Smuzhiyun #include <fcntl.h>
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #include "proc-uptime.h"
25*4882a593Smuzhiyun
main(void)26*4882a593Smuzhiyun int main(void)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun uint64_t start, u0, u1, i0, i1;
29*4882a593Smuzhiyun int fd;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun fd = open("/proc/uptime", O_RDONLY);
32*4882a593Smuzhiyun assert(fd >= 0);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun proc_uptime(fd, &u0, &i0);
35*4882a593Smuzhiyun start = u0;
36*4882a593Smuzhiyun do {
37*4882a593Smuzhiyun proc_uptime(fd, &u1, &i1);
38*4882a593Smuzhiyun assert(u1 >= u0);
39*4882a593Smuzhiyun assert(i1 >= i0);
40*4882a593Smuzhiyun u0 = u1;
41*4882a593Smuzhiyun i0 = i1;
42*4882a593Smuzhiyun } while (u1 - start < 100);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return 0;
45*4882a593Smuzhiyun }
46