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 that open(/proc/*/fd/*) opens the same file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #undef NDEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <assert.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int main(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	int fd0, fd1, fd2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	struct stat st0, st1, st2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	char buf[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	fd0 = open("/", O_DIRECTORY|O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	assert(fd0 >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	snprintf(buf, sizeof(buf), "/proc/self/fd/%u", fd0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	fd1 = open(buf, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	assert(fd1 >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	snprintf(buf, sizeof(buf), "/proc/thread-self/fd/%u", fd0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	fd2 = open(buf, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	assert(fd2 >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	rv = fstat(fd0, &st0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	assert(rv == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	rv = fstat(fd1, &st1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	assert(rv == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	rv = fstat(fd2, &st2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	assert(rv == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	assert(st0.st_dev == st1.st_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	assert(st0.st_ino == st1.st_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	assert(st0.st_dev == st2.st_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	assert(st0.st_ino == st2.st_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }