#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>

int
main(int argc, char **argv)
{
        static const int name[] = {
                CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME,
        };
        char path[MAXPATHLEN];
        size_t len;
	int rv;
	struct stat st;

	rv = chroot("/var/tmp");
	if (rv != 0) {
		printf("chroot() failed\n");
		return -1;
	}

	getcwd(path, MAXPATHLEN);

	printf("cwd='%s'\n", path);

        len = sizeof(path);
        if (sysctl(name, __arraycount(name), path, &len, NULL, 0) != -1)
                printf("execname='%s'\n", path);
	else {
		printf("ERR\n");
		return -1;
	}

	rv = stat(path, &st);
	if (rv == 0)
		printf("We can stat '%s'\n", path);
	else
		printf("Cannot stat '%s'\n", path);

	return 0;
}