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Date:	Tue, 19 Feb 2002 09:57:59 +0100
To:	cygwin AT cygwin DOT com
From:	"Ph. Marek" <marek AT bmlv DOT gv DOT at>
Subject:	Problem compiling - unix compatible but using winsock2
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Hello everybody!

To clarify my problem reported last week:
My program lists
	#include <arpa/inet.h>
	#include <netinet/in.h>
	#include <netinet/ip.h>
	#include <netdb.h>
	#include <sys/socket.h>
	#include <sys/time.h>
	#include <sys/wait.h>
	#include <ctype.h>
	#include <fcntl.h>
	#include <math.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <strings.h>
	#include <sys/mman.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <sys/uio.h>
	#include <sys/utsname.h>
	#include <sys/unistd.h>
	#include <stdarg.h>
	#include <unistd.h>
	#include <errno.h>
which works with Linux and AIX.

If I try this with cygwin it compiles, but upon call it says
	setsockopt(IP_MULTICAST_LOOP)
	errno=14 (Bad address)

The offending part is
	char c;
	c=0;
	if (setsockopt(sock, IPPROTO_IP, 
		IP_MULTICAST_LOOP, (void*)&c, sizeof(c)))
	ERROR("setsockopt(IP_MULTICAST_LOOP)");

After changing the "char" to an "int" I get
	setsockopt(IP_MULTICAST_LOOP)
	errno=109 (This option is unsupported)

Which I think after reading in some .h files
is because it uses winsock 1.1. 
As I found ws2tcpip.h I try to include that via

	#ifdef __WIN32__
	#include <w32api/ws2tcpip.h> 
	#endif

either before or after the above #include lines.
But I get a lot of "conflicting types for xxx"
in netdb.h, sys/socket.h, asm/byteorder.h, and even
	cygwin/in.h:25: parse error before '0'


Any help how to use the definitions from ws2tcpip.h?


Thank you!


Regards

Phil


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