162306a36Sopenharmony_ci/* 262306a36Sopenharmony_ci * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com> 362306a36Sopenharmony_ci * 462306a36Sopenharmony_ci * Permission to use, copy, modify, and distribute this software for any 562306a36Sopenharmony_ci * purpose with or without fee is hereby granted, provided that the above 662306a36Sopenharmony_ci * copyright notice and this permission notice appear in all copies. 762306a36Sopenharmony_ci * 862306a36Sopenharmony_ci * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 962306a36Sopenharmony_ci * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 1062306a36Sopenharmony_ci * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 1162306a36Sopenharmony_ci * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 1262306a36Sopenharmony_ci * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 1362306a36Sopenharmony_ci * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 1462306a36Sopenharmony_ci * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 1562306a36Sopenharmony_ci */ 1662306a36Sopenharmony_ci// Test that boottime value in /proc/uptime and CLOCK_BOOTTIME increment 1762306a36Sopenharmony_ci// monotonically. We don't test idle time monotonicity due to broken iowait 1862306a36Sopenharmony_ci// task counting, cf: comment above get_cpu_idle_time_us() 1962306a36Sopenharmony_ci#undef NDEBUG 2062306a36Sopenharmony_ci#include <assert.h> 2162306a36Sopenharmony_ci#include <stdint.h> 2262306a36Sopenharmony_ci#include <sys/types.h> 2362306a36Sopenharmony_ci#include <sys/stat.h> 2462306a36Sopenharmony_ci#include <fcntl.h> 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_ci#include "proc-uptime.h" 2762306a36Sopenharmony_ci 2862306a36Sopenharmony_ciint main(void) 2962306a36Sopenharmony_ci{ 3062306a36Sopenharmony_ci uint64_t start, u0, u1, c0, c1; 3162306a36Sopenharmony_ci int fd; 3262306a36Sopenharmony_ci 3362306a36Sopenharmony_ci fd = open("/proc/uptime", O_RDONLY); 3462306a36Sopenharmony_ci assert(fd >= 0); 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ci u0 = proc_uptime(fd); 3762306a36Sopenharmony_ci start = u0; 3862306a36Sopenharmony_ci c0 = clock_boottime(); 3962306a36Sopenharmony_ci 4062306a36Sopenharmony_ci do { 4162306a36Sopenharmony_ci u1 = proc_uptime(fd); 4262306a36Sopenharmony_ci c1 = clock_boottime(); 4362306a36Sopenharmony_ci 4462306a36Sopenharmony_ci /* Is /proc/uptime monotonic ? */ 4562306a36Sopenharmony_ci assert(u1 >= u0); 4662306a36Sopenharmony_ci 4762306a36Sopenharmony_ci /* Is CLOCK_BOOTTIME monotonic ? */ 4862306a36Sopenharmony_ci assert(c1 >= c0); 4962306a36Sopenharmony_ci 5062306a36Sopenharmony_ci /* Is CLOCK_BOOTTIME VS /proc/uptime monotonic ? */ 5162306a36Sopenharmony_ci assert(c0 >= u0); 5262306a36Sopenharmony_ci 5362306a36Sopenharmony_ci u0 = u1; 5462306a36Sopenharmony_ci c0 = c1; 5562306a36Sopenharmony_ci } while (u1 - start < 100); 5662306a36Sopenharmony_ci 5762306a36Sopenharmony_ci return 0; 5862306a36Sopenharmony_ci} 59