#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int
domainname(const char *name)
{
    char buf[16*1024];
    int sts = 0;

    if (name)
	sts = setdomainname(name, strlen(name));
    if (sts != 0) {
        perror("setdomainname");
        exit(1);
    }
    sts = getdomainname(buf, sizeof(buf));
    if (sts != 0) {
        perror("getdomainname");
        exit(1);
    }

    fputs(buf, stdout);
}

int main(int argc, char **argv)
{
    if (argc > 2)
	exit(1);
    return domainname(argc == 2 ? argv[1] : NULL);
}