11f5bd054SAlexey Dobriyan /*
2ee9294d6SAlexey Dobriyan * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
31f5bd054SAlexey Dobriyan *
41f5bd054SAlexey Dobriyan * Permission to use, copy, modify, and distribute this software for any
51f5bd054SAlexey Dobriyan * purpose with or without fee is hereby granted, provided that the above
61f5bd054SAlexey Dobriyan * copyright notice and this permission notice appear in all copies.
71f5bd054SAlexey Dobriyan *
81f5bd054SAlexey Dobriyan * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
91f5bd054SAlexey Dobriyan * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
101f5bd054SAlexey Dobriyan * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
111f5bd054SAlexey Dobriyan * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
121f5bd054SAlexey Dobriyan * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
131f5bd054SAlexey Dobriyan * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
141f5bd054SAlexey Dobriyan * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
151f5bd054SAlexey Dobriyan */
161f5bd054SAlexey Dobriyan #undef NDEBUG
171f5bd054SAlexey Dobriyan #include <assert.h>
181f5bd054SAlexey Dobriyan #include <errno.h>
191f5bd054SAlexey Dobriyan #include <string.h>
201f5bd054SAlexey Dobriyan #include <stdlib.h>
211f5bd054SAlexey Dobriyan #include <unistd.h>
22*263dda24SFrederic Weisbecker #include <time.h>
231f5bd054SAlexey Dobriyan
24b2f5de03SAlexey Dobriyan #include "proc.h"
251f5bd054SAlexey Dobriyan
clock_boottime(void)26*263dda24SFrederic Weisbecker static uint64_t clock_boottime(void)
27*263dda24SFrederic Weisbecker {
28*263dda24SFrederic Weisbecker struct timespec ts;
29*263dda24SFrederic Weisbecker int err;
30*263dda24SFrederic Weisbecker
31*263dda24SFrederic Weisbecker err = clock_gettime(CLOCK_BOOTTIME, &ts);
32*263dda24SFrederic Weisbecker assert(err >= 0);
33*263dda24SFrederic Weisbecker
34*263dda24SFrederic Weisbecker return (ts.tv_sec * 100) + (ts.tv_nsec / 10000000);
35*263dda24SFrederic Weisbecker }
36*263dda24SFrederic Weisbecker
proc_uptime(int fd)37270b2a67SFrederic Weisbecker static uint64_t proc_uptime(int fd)
381f5bd054SAlexey Dobriyan {
391f5bd054SAlexey Dobriyan uint64_t val1, val2;
401f5bd054SAlexey Dobriyan char buf[64], *p;
411f5bd054SAlexey Dobriyan ssize_t rv;
421f5bd054SAlexey Dobriyan
431f5bd054SAlexey Dobriyan /* save "p < end" checks */
441f5bd054SAlexey Dobriyan memset(buf, 0, sizeof(buf));
451f5bd054SAlexey Dobriyan rv = pread(fd, buf, sizeof(buf), 0);
461f5bd054SAlexey Dobriyan assert(0 <= rv && rv <= sizeof(buf));
471f5bd054SAlexey Dobriyan buf[sizeof(buf) - 1] = '\0';
481f5bd054SAlexey Dobriyan
491f5bd054SAlexey Dobriyan p = buf;
501f5bd054SAlexey Dobriyan
511f5bd054SAlexey Dobriyan val1 = xstrtoull(p, &p);
521f5bd054SAlexey Dobriyan assert(p[0] == '.');
531f5bd054SAlexey Dobriyan assert('0' <= p[1] && p[1] <= '9');
541f5bd054SAlexey Dobriyan assert('0' <= p[2] && p[2] <= '9');
551f5bd054SAlexey Dobriyan assert(p[3] == ' ');
561f5bd054SAlexey Dobriyan
571f5bd054SAlexey Dobriyan val2 = (p[1] - '0') * 10 + p[2] - '0';
581f5bd054SAlexey Dobriyan
59270b2a67SFrederic Weisbecker return val1 * 100 + val2;
601f5bd054SAlexey Dobriyan }
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