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 /proc/thread-self gives correct TGID/PID.
^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 <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <sys/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include "proc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int f(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	char buf1[64], buf2[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	pid_t pid, tid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	ssize_t rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	pid = sys_getpid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	tid = sys_gettid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	snprintf(buf1, sizeof(buf1), "%u/task/%u", pid, tid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	rv = readlink("/proc/thread-self", buf2, sizeof(buf2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	assert(rv == strlen(buf1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	buf2[rv] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	assert(streq(buf1, buf2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	if (arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		exit(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	return 0;
^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 int PAGE_SIZE = sysconf(_SC_PAGESIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	pid_t pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	void *stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	/* main thread */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	f((void *)0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	stack = mmap(NULL, 2 * PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	assert(stack != MAP_FAILED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	/* side thread */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	pid = clone(f, stack + PAGE_SIZE, CLONE_THREAD|CLONE_SIGHAND|CLONE_VM, (void *)1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	assert(pid > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	pause();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }