#include "apue.h"#include <sys/socket.h>#include <sys/un.h>intmain(void){	int fd, size;	struct sockaddr_un un;	un.sun_family = AF_UNIX;	strcpy(un.sun_path, "foo.socket");	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)		err_sys("socket failed");	size = offsetof(struct sockaddr_un, sun_path) + strlen(un.sun_path);	if (bind(fd, (struct sockaddr *)&un, size) < 0)		err_sys("bind failed");	printf("UNIX domain socket bound\n");	exit(0);}