Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Permission to use, copy, modify, and distribute this software for any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * purpose with or without fee is hereby granted, provided that the above
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * copyright notice and this permission notice appear in all copies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #undef NDEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <assert.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "proc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static void proc_uptime(int fd, uint64_t *uptime, uint64_t *idle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	uint64_t val1, val2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	char buf[64], *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	ssize_t rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	/* save "p < end" checks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	memset(buf, 0, sizeof(buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	rv = pread(fd, buf, sizeof(buf), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	assert(0 <= rv && rv <= sizeof(buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	buf[sizeof(buf) - 1] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	p = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	val1 = xstrtoull(p, &p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	assert(p[0] == '.');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	assert('0' <= p[1] && p[1] <= '9');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	assert('0' <= p[2] && p[2] <= '9');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	assert(p[3] == ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	val2 = (p[1] - '0') * 10 + p[2] - '0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	*uptime = val1 * 100 + val2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	p += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	val1 = xstrtoull(p, &p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	assert(p[0] == '.');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	assert('0' <= p[1] && p[1] <= '9');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	assert('0' <= p[2] && p[2] <= '9');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	assert(p[3] == '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	val2 = (p[1] - '0') * 10 + p[2] - '0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	*idle = val1 * 100 + val2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	assert(p + 4 == buf + rv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }