Demo of getting host name and domain name

gethostname.c

 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>

int main(int argc,char **argv) {
	int z;
	char buf[32];

	z = gethostname(buf,sizeof(buf));

	if ( z == -1 ) {
		fprintf(stderr, "%s: gethostname(2)\n",
				strerror(errno));
		exit(1);
	}

	printf("host name = '%s'\n",buf);

	z = getdomainname(buf,sizeof buf);

	if ( z == -1 ) {
		fprintf(stderr,"%s: getdomainname(2)\n",
				strerror(errno));
		exit(1);
	}

	printf("domain name = '%s'\n",buf);

	return 0;
}