This patch actually causes the Config script to compile a small test
program which tests the effectiveness of posix/bsdisms on non blocking
IO, specifically sockets.  I'm not sure if it will compile straight
off everywhere, but if it picks up IRCDLIBS from the Makefile right,
it should.  I've updated the .tar's on coombs.

avalon

*** Config.orig	Wed Nov 10 05:12:04 1993
--- Config	Wed Nov 10 05:06:18 1993
***************
*** 228,248 ****
  	$RM -f $TMP
  fi
  cat > $PLATE <<_EOF_
  #include <fcntl.h>
  #include <sys/ioctl.h>
  #include <sys/file.h>
  main()
  {
! 	int f;
! 	f = fcntl(0, F_SETFL, BLOCKING);
  }
  _EOF_
  sed -e 's/BLOCKING/O_NONBLOCK/' $PLATE > $TMP
! `eval $COMP`
  if [ 0 -eq $? ] ; then
  	BLOCK=O_NONBLOCK
  else
! 	echo 'O_NONBLOCK not present in fcntl.h or sys/ioctl.h'
  	if [ -f $TMP -o -d $TMP ] ; then
  		$RM -f $TMP $EXEC;
  	fi
--- 228,267 ----
  	$RM -f $TMP
  fi
  cat > $PLATE <<_EOF_
+ #include <sys/types.h>
+ #include <sys/socket.h>
  #include <fcntl.h>
  #include <sys/ioctl.h>
  #include <sys/file.h>
+ #include <signal.h>
+ alarmed()
+ {
+ 	exit(1);
+ }
  main()
  {
! 	char b[12], x[32];
! 	int f, l = sizeof(x);
! 	f = socket(AF_INET, SOCK_DGRAM, 0);
! 	if (f >= 0 && !(fcntl(f, F_SETFL, BLOCKING))) {
! 		signal(SIGALRM, alarmed);
! 		alarm(3);
! 		recvfrom(f, b, 12, 0, x, &l);
! 		alarm(0);
! 		exit(0);
! 	}
! 	exit(1);
  }
  _EOF_
  sed -e 's/BLOCKING/O_NONBLOCK/' $PLATE > $TMP
! eval $COMP
  if [ 0 -eq $? ] ; then
+ 	eval $EXEC
+ fi
+ if [ 0 -eq $? ] ; then
  	BLOCK=O_NONBLOCK
  else
! 	echo 'O_NONBLOCK not present/working in fcntl.h or sys/ioctl.h'
  	if [ -f $TMP -o -d $TMP ] ; then
  		$RM -f $TMP $EXEC;
  	fi
***************
*** 249,257 ****
  	sed -e 's/BLOCKING/O_NDELAY/' $PLATE > $TMP
  	eval $COMP
  	if [ 0 -eq $? ] ; then
  		BLOCK=O_NDELAY
  	else
! 		echo 'O_NDELAY not present in fcntl.h or sys/ioctl.h'
  		if [ -f $TMP -o -d $TMP ] ; then
  			$RM -f $TMP $EXEC;
  		fi
--- 268,279 ----
  	sed -e 's/BLOCKING/O_NDELAY/' $PLATE > $TMP
  	eval $COMP
  	if [ 0 -eq $? ] ; then
+ 		eval $EXEC
+ 	fi
+ 	if [ 0 -eq $? ] ; then
  		BLOCK=O_NDELAY
  	else
! 		echo 'O_NDELAY not present/working in fcntl.h or sys/ioctl.h'
  		if [ -f $TMP -o -d $TMP ] ; then
  			$RM -f $TMP $EXEC;
  		fi