SCO Unix and non-blocking sockets ?

[Tom Friedel]

I have an application that I am trying to port to SCO Unix.  Via
print statements I have determined that the program is blocking
on a write (or send) to a socket.

I have tried 
   fctnl( sockfd, F_SETFL, FNDELAY )
and
  int i = 1 ;
  ioctl( sockfd, FIONBIO, &i ) ;

to set the socket in non-blocking mode.
The second is based upon an example I saw that used FIOSNBIO.

The blocking only occurs when more than one process is attempting
to read/write/select on a common server socket number, so I am worried
that the problem is at a lower level.

Any pointers to good BSD socket programming texts would be welcome.
I have 'An Introductory 4.3BSD Interprocess Communications Tutorial'
by Sechrest (an article)

tom
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Tom Friedel  JDyx Enterprises (404) 320-7624 tpf at jdyx.UUCP 
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