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From: edw@ius1.cs.cmu.edu (Eddie Wyatt)
Newsgroups: comp.unix.questions
Subject: Re: DATAGRAM sockets in the  UNIX  DOMAIN.
Message-ID: <1041@ius1.cs.cmu.edu>
Date: Sun, 13-Sep-87 13:38:51 EDT
Article-I.D.: ius1.1041
Posted: Sun Sep 13 13:38:51 1987
Date-Received: Mon, 14-Sep-87 02:53:32 EDT
References: <577@acer.stl.stc.co.uk>
Organization: Carnegie-Mellon University, CS/RI
Lines: 57

> /*  SERVER */
> struct sockaddr_un sock;
> fd=socket(AF_UNIX,SOCK_DGRAM,0);  /*create a socket */
> bind(fd,&sock,sizeof(sock.sun_family)+1+strlen(sokname))
> 				  /*binding tjhe socket */
> icotl(fd,FIOASYNC,(char*)&fioasync) /* setting flag for async I/O */
> icotl(fd,SIOCSPGRP,(char*)&pid)     /* set process group pid for signal  */
			    ^^^^

    int pgrp = -getpid();


    (void) signal(_WHICH_INTERRUPT,urgent_message_processor);
    (void) ioctl(port,SIOCSPGRP, (char *) &pgrp);


> signal(SIGIO,sig_handler)
> sigpause(SIGIO)
> .
> .
> /* END SERVER */
> 
> 
> 
> 
> /*  CLIENT */
> struct sockaddr_un sock;
> fd=socket(AF_UNIX,SOCK_DGRAM,0);  /*create a socket */
> bind(fd,&sock,sizeof(sock.sun_family)+1+strlen(sokname))
> 				  /*binding the socket */
> icotl(fd,FIOASYNC,(char*)&fioasync) /* setting flag for async I/O */
> icotl(fd,SIOCSPGRP,(char*)&pid)     /* set process group pid for signal  */
			     ^^^
			Same here.

> signal(SIGIO,sig_handler)
> .
> .
> sendto(fd,...)               /*sendto SERVER */
> .
> .
> .
> sigpause(SIGIO)
> .
> /* END CLIENT */
> 
> 
> sig_handler() performs recvfrom for the CLIENT  and
> 	      recvfrom & sendto for the SERVER.


				Eddie Wyatt
-- 

					Eddie Wyatt

e-mail: edw@ius1.cs.cmu.edu