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Linux/tools/testing/selftests/proc/proc-uptime.h

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  1 /*
  2  * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
  3  *
  4  * Permission to use, copy, modify, and distribute this software for any
  5  * purpose with or without fee is hereby granted, provided that the above
  6  * copyright notice and this permission notice appear in all copies.
  7  *
  8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15  */
 16 #undef NDEBUG
 17 #include <assert.h>
 18 #include <errno.h>
 19 #include <string.h>
 20 #include <stdlib.h>
 21 #include <unistd.h>
 22 
 23 #include "proc.h"
 24 
 25 static void proc_uptime(int fd, uint64_t *uptime, uint64_t *idle)
 26 {
 27         uint64_t val1, val2;
 28         char buf[64], *p;
 29         ssize_t rv;
 30 
 31         /* save "p < end" checks */
 32         memset(buf, 0, sizeof(buf));
 33         rv = pread(fd, buf, sizeof(buf), 0);
 34         assert(0 <= rv && rv <= sizeof(buf));
 35         buf[sizeof(buf) - 1] = '\0';
 36 
 37         p = buf;
 38 
 39         val1 = xstrtoull(p, &p);
 40         assert(p[0] == '.');
 41         assert('' <= p[1] && p[1] <= '9');
 42         assert('' <= p[2] && p[2] <= '9');
 43         assert(p[3] == ' ');
 44 
 45         val2 = (p[1] - '') * 10 + p[2] - '';
 46         *uptime = val1 * 100 + val2;
 47 
 48         p += 4;
 49 
 50         val1 = xstrtoull(p, &p);
 51         assert(p[0] == '.');
 52         assert('' <= p[1] && p[1] <= '9');
 53         assert('' <= p[2] && p[2] <= '9');
 54         assert(p[3] == '\n');
 55 
 56         val2 = (p[1] - '') * 10 + p[2] - '';
 57         *idle = val1 * 100 + val2;
 58 
 59         assert(p + 4 == buf + rv);
 60 }
 61 

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