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From: pau@stl.stc.co.uk (Vipin Pau)
Newsgroups: comp.unix.questions
Subject: DATAGRAM sockets in the  UNIX  DOMAIN.
Message-ID: <577@acer.stl.stc.co.uk>
Date: Wed, 9-Sep-87 13:58:35 EDT
Article-I.D.: acer.577
Posted: Wed Sep  9 13:58:35 1987
Date-Received: Sat, 12-Sep-87 04:42:12 EDT
Reply-To: pau@stl.UUCP (Vipin Pau)
Organization: STL,Harlow,UK.
Lines: 57

Help needed with INTERRUPTS when used with DATAGRAM sockets
in the UNIX domain.


At the moment we have a simple CLIENT/SERVER model where
the communication is done using DATAGRAM sockets in the INET domain 
with INTERRUPTS which works successfully.

The same exercise in the UNIX  domain has not been sucessful. 
A skeleton code is supplied to clarify (hopefully)


/*  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  */
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  */
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.


We would like to hear from people who have had similar experiance
or success!!
-- 
Regards

pau      ( pau@stl.stc.co.uk +44-279-29531 )