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/loadavg correctly reports last pid in pid namespace. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <fcntl.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/wait.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) 	pid_t pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	int wstatus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	if (unshare(CLONE_NEWPID) == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		if (errno == ENOSYS || errno == EPERM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			return 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		return 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) 	pid = fork();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (pid == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	if (pid == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		char buf[128], *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		ssize_t rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		fd = open("/proc/loadavg" , O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		if (fd == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		rv = read(fd, buf, sizeof(buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		if (rv < 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		p = buf + rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		/* pid 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		if (!(p[-3] == ' ' && p[-2] == '1' && p[-1] == '\n'))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		pid = fork();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		if (pid == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		if (pid == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		if (waitpid(pid, NULL, 0) == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		lseek(fd, 0, SEEK_SET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		rv = read(fd, buf, sizeof(buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 		if (rv < 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 		p = buf + rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 		/* pid 2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		if (!(p[-3] == ' ' && p[-2] == '2' && p[-1] == '\n'))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	if (waitpid(pid, &wstatus, 0) == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }