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) /* Test readlink /proc/self/map_files/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static void pass(const char *fmt, unsigned long a, unsigned long b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	char name[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	char buf[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	snprintf(name, sizeof(name), fmt, a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	if (readlink(name, buf, sizeof(buf)) == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void fail(const char *fmt, unsigned long a, unsigned long b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	char name[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	char buf[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	snprintf(name, sizeof(name), fmt, a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	if (readlink(name, buf, sizeof(buf)) == -1 && errno == ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int main(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	void *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	unsigned long a, b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	fd = open("/dev/zero", O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	if (fd == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	p = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE, fd, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	if (p == MAP_FAILED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	a = (unsigned long)p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	b = (unsigned long)p + PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	pass("/proc/self/map_files/%lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	fail("/proc/self/map_files/ %lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	fail("/proc/self/map_files/%lx -%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	fail("/proc/self/map_files/%lx- %lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	fail("/proc/self/map_files/%lx-%lx ", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	fail("/proc/self/map_files/0%lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	fail("/proc/self/map_files/%lx-0%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	if (sizeof(long) == 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 		fail("/proc/self/map_files/100000000%lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 		fail("/proc/self/map_files/%lx-100000000%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	} else if (sizeof(long) == 8) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 		fail("/proc/self/map_files/10000000000000000%lx-%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		fail("/proc/self/map_files/%lx-10000000000000000%lx", a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }