/* * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #undef NDEBUG #include <assert.h> #include <errno.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include "proc.h" static void proc_uptime(int fd, uint64_t *uptime, uint64_t *idle) { uint64_t val1, val2; char buf[64], *p; ssize_t rv; /* save "p < end" checks */ memset(buf, 0, sizeof(buf)); rv = pread(fd, buf, sizeof(buf), 0); assert(0 <= rv && rv <= sizeof(buf)); buf[sizeof(buf) - 1] = '\0'; p = buf; val1 = xstrtoull(p, &p); assert(p[0] == '.'); assert('0' <= p[1] && p[1] <= '9'); assert('0' <= p[2] && p[2] <= '9'); assert(p[3] == ' '); val2 = (p[1] - '0') * 10 + p[2] - '0'; *uptime = val1 * 100 + val2; p += 4; val1 = xstrtoull(p, &p); assert(p[0] == '.'); assert('0' <= p[1] && p[1] <= '9'); assert('0' <= p[2] && p[2] <= '9'); assert(p[3] == '\n'); val2 = (p[1] - '0') * 10 + p[2] - '0'; *idle = val1 * 100 + val2; assert(p + 4 == buf + rv); }