dccp_macro.m4

AC_DEFUN([CHECK_DCCP],
			[AC_MSG_CHECKING(for DCCP support)
			 AC_TRY_RUN(	[#define MIN_REQUIRED_VERSION_MAJOR 3
					#define MIN_REQUIRED_VERSION_MINOR 2
					#define MIN_REQUIRED_VERSION_REV   0

					#include <sys/utsname.h>
					#include <sys/socket.h>
					#include <string.h>
					#include <stdlib.h>
					//#include <stdio.h>
					#ifndef SOCK_DCCP
					#define SOCK_DCCP 6  
					#endif
					#ifndef IPPROTO_DCCP    
					#define IPPROTO_DCCP 33
					#endif

					int main()
					{
						int major=0, minor=0, rev=0;
						struct utsname buf;
						char* tmp;
						if(uname(&buf)<0){
							return 1;
						}
						
						//printf("%s\n",buf.release);
						tmp=strtok(buf.release,".");
						if(tmp!=NULL){major=atoi(tmp);}
						tmp=strtok(NULL,".-");
						if(tmp!=NULL){minor=atoi(tmp);}
						tmp=strtok(NULL,".-");
						if(tmp!=NULL){rev=atoi(tmp);}
						//printf("%i.%i.%i\n", major, minor, rev);

						if (major >  MIN_REQUIRED_VERSION_MAJOR)
						{
							/*Good Version*/
						}
						else
						{
							if (major == MIN_REQUIRED_VERSION_MAJOR && 
								minor > MIN_REQUIRED_VERSION_MINOR)
							{
								/*Good Version*/
							}
							else
							{
								if (major == MIN_REQUIRED_VERSION_MAJOR && 
									minor == MIN_REQUIRED_VERSION_MINOR && 
									rev > MIN_REQUIRED_VERSION_REV)
								{
									/*Good Version*/
								}
								else
								{
									if (major == MIN_REQUIRED_VERSION_MAJOR && 
										minor == MIN_REQUIRED_VERSION_MINOR && 
										rev == MIN_REQUIRED_VERSION_REV)
									{
										/*Good Version*/
									}
									else
									{
										/*Invalid Version*/
										return 1;
									}
								}
							}

						}

						/*Confirm that DCCP module exists and can be loaded*/
						if(socket(AF_INET, SOCK_DCCP, IPPROTO_DCCP)<0){
							return 1;
						}
					return 0;
					}],
			[ AC_MSG_RESULT(yes) 
			  AC_DEFINE([build_dccp],[1],[DCCP only supported on Linux >=3.2.0])],
			[AC_MSG_RESULT(no)],
			[AC_MSG_RESULT(cross-compiling... disabled)] )
		]
	)