| 1 | /* |
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| 2 | * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com> |
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| 3 | * |
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| 4 | * Permission to use, copy, modify, and distribute this software for any |
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| 5 | * purpose with or without fee is hereby granted, provided that the above |
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| 6 | * copyright notice and this permission notice appear in all copies. |
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| 7 | * |
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| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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| 9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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| 10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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| 11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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| 12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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| 13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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| 14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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| 15 | */ |
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| 16 | // Test that boottime value in /proc/uptime and CLOCK_BOOTTIME increment |
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| 17 | // monotonically. We don't test idle time monotonicity due to broken iowait |
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| 18 | // task counting, cf: comment above get_cpu_idle_time_us() |
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| 19 | #undef NDEBUG |
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| 20 | #include <assert.h> |
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| 21 | #include <stdint.h> |
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| 22 | #include <sys/types.h> |
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| 23 | #include <sys/stat.h> |
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| 24 | #include <fcntl.h> |
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| 25 | |
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| 26 | #include "proc-uptime.h" |
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| 27 | |
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| 28 | int main(void) |
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| 29 | { |
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| 30 | uint64_t start, u0, u1, c0, c1; |
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| 31 | int fd; |
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| 32 | |
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| 33 | fd = open("/proc/uptime" , O_RDONLY); |
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| 34 | assert(fd >= 0); |
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| 35 | |
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| 36 | u0 = proc_uptime(fd); |
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| 37 | start = u0; |
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| 38 | c0 = clock_boottime(); |
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| 39 | |
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| 40 | do { |
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| 41 | u1 = proc_uptime(fd); |
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| 42 | c1 = clock_boottime(); |
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| 43 | |
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| 44 | /* Is /proc/uptime monotonic ? */ |
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| 45 | assert(u1 >= u0); |
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| 46 | |
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| 47 | /* Is CLOCK_BOOTTIME monotonic ? */ |
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| 48 | assert(c1 >= c0); |
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| 49 | |
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| 50 | /* Is CLOCK_BOOTTIME VS /proc/uptime monotonic ? */ |
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| 51 | assert(c0 >= u0); |
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| 52 | |
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| 53 | u0 = u1; |
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| 54 | c0 = c1; |
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| 55 | } while (u1 - start < 100); |
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| 56 | |
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| 57 | return 0; |
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| 58 | } |
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| 59 | |
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