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) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <sys/syscall.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 <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static inline ssize_t sys_read(int fd, void *buf, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	return syscall(SYS_read, fd, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) int main(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	char buf1[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	char buf2[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	ssize_t rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	fd = open("/proc/self/syscall", O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	if (fd == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		if (errno == ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 			return 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	/* Do direct system call as libc can wrap anything. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	snprintf(buf1, sizeof(buf1), "%ld 0x%lx 0x%lx 0x%lx",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		 (long)SYS_read, (long)fd, (long)buf2, (long)sizeof(buf2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	memset(buf2, 0, sizeof(buf2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	rv = sys_read(fd, buf2, sizeof(buf2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (rv < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	if (rv < strlen(buf1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	if (strncmp(buf1, buf2, strlen(buf1)) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }