#include "apue.h"#include <sys/socket.h>#include <sys/un.h>#include <errno.h>#define	CLI_PATH	"/var/tmp/"		/* +5 for pid = 14 chars */#define	CLI_PERM	S_IRWXU			/* rwx for user only *//* * Create a client endpoint and connect to a server. * Returns fd if all OK, <0 on error. */intcli_conn(const char *name){	int					fd, len, err, rval;	struct sockaddr_un	un;	/* create a UNIX domain stream socket */	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)		return(-1);	/* fill socket address structure with our address */	memset(&un, 0, sizeof(un));	un.sun_family = AF_UNIX;	sprintf(un.sun_path, "%s%05d", CLI_PATH, getpid());	len = offsetof(struct sockaddr_un, sun_path) + strlen(un.sun_path);	unlink(un.sun_path);		/* in case it already exists */	if (bind(fd, (struct sockaddr *)&un, len) < 0) {		rval = -2;		goto errout;	}	if (chmod(un.sun_path, CLI_PERM) < 0) {		rval = -3;		goto errout;	}	/* fill socket address structure with server's address */	memset(&un, 0, sizeof(un));	un.sun_family = AF_UNIX;	strcpy(un.sun_path, name);	len = offsetof(struct sockaddr_un, sun_path) + strlen(name);	if (connect(fd, (struct sockaddr *)&un, len) < 0) {		rval = -4;		goto errout;	}	return(fd);errout:	err = errno;	close(fd);	errno = err;	return(rval);}