46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
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/*
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* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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// Test that values in /proc/uptime increment monotonically.
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#undef NDEBUG
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#include <assert.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "proc-uptime.h"
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int main(void)
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{
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uint64_t start, u0, u1, i0, i1;
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int fd;
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fd = open("/proc/uptime", O_RDONLY);
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assert(fd >= 0);
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proc_uptime(fd, &u0, &i0);
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start = u0;
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do {
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proc_uptime(fd, &u1, &i1);
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assert(u1 >= u0);
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assert(i1 >= i0);
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u0 = u1;
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i0 = i1;
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} while (u1 - start < 100);
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return 0;
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}
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