#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>

#ifndef SYS_accessat
#define SYS_accessat 489  // Make sure this matches your system's syscall number for accessat
#endif

int main(int argc, char **argv)
{
	if (argc != 3) {
		printf("Usage %s file symlink_to_file\n", argv[0]);
		return (0);
	}

	const char *pathname = argv[1];
	const char *linkpath = argv[2];
	int dirfd = AT_FDCWD;  // Use the current working directory
	int mode = R_OK;       // Check for read permission
	int flags = 0;

	{
		long result = syscall(SYS_accessat, dirfd, pathname, mode, flags);
		if (result == 0) {
			printf("File is accessible\n");
		} else {
			perror("accessat");
		}

		long result2 = syscall(SYS_accessat, dirfd, linkpath, mode, flags);
		if (result2 == 0) {
			printf("link is accessible\n");
		} else {
			perror("accessat");
		}
	}

	sleep(3);

	{
		printf("With AT_SYMLINK_NOFOLLOW:\n");
		flags = AT_SYMLINK_NOFOLLOW;
		long result = syscall(SYS_accessat, dirfd, pathname, mode, flags);
		if (result == 0) {
			printf("File is accessible\n");
		} else {
			perror("accessat");
		}

		long result2 = syscall(SYS_accessat, dirfd, linkpath, mode, flags);
		if (result2 == 0) {
			printf("link is accessible\n");
		} else {
			perror("accessat");
		}
	}

	return 0;
}