added check for net/bpf.h in configure.ac

mio/configure

@@ -13997,7 +13997,7 @@ fi
 
 done
 
-for ac_header in net/if.h net/if_dl.h netpacket/packet.h
+for ac_header in net/if.h net/if_dl.h netpacket/packet.h net/bpf.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "

mio/configure.ac

@@ -113,7 +113,7 @@ AC_CHECK_HEADERS([sys/resource.h sys/wait.h sys/syscall.h sys/ioctl.h])
 AC_CHECK_HEADERS([sys/sendfile.h sys/epoll.h sys/event.h sys/poll.h])
 AC_CHECK_HEADERS([sys/sysctl.h sys/socket.h sys/sockio.h sys/un.h])
 AC_CHECK_HEADERS([ifaddrs.h tiuser.h linux/netfilter_ipv4.h netinet/in.h netinet/sctp.h])
-AC_CHECK_HEADERS([net/if.h net/if_dl.h netpacket/packet.h], [], [], [
+AC_CHECK_HEADERS([net/if.h net/if_dl.h netpacket/packet.h net/bpf.h], [], [], [
 	#include <sys/types.h>
 	#include <sys/socket.h>])
 AC_CHECK_HEADERS([sys/stropts.h sys/macstat.h linux/ethtool.h linux/sockios.h])

mio/lib/mio-cfg.h.in

@@ -217,6 +217,9 @@
 /* Define to 1 if you have the <netpacket/packet.h> header file. */
 #undef HAVE_NETPACKET_PACKET_H
 
+/* Define to 1 if you have the <net/bpf.h> header file. */
+#undef HAVE_NET_BPF_H
+
 /* Define to 1 if you have the <net/if_dl.h> header file. */
 #undef HAVE_NET_IF_DL_H
 

mio/lib/sck.c

@@ -55,7 +55,9 @@
 #	include <sys/ioctl.h>
 #endif
 
+#if defined(HAVE_NET_BPF_H)
 #	include <net/bpf.h>
+#endif
 
 #if defined(__linux__)
 #	include <limits.h>
@@ -179,8 +181,10 @@ static mio_syshnd_t open_async_bpf (mio_t* mio)
 	fd = open("/dev/bpf", O_RDWR);
 	if (fd == MIO_SYSHND_INVALID) goto oops;
 
+#if 0
 	if (ioctl(fd, BIOCIMMEDIATE, &tmp) == -1) goto oops;
 	if (ioctl(fd, BIOCGBLEN, &bufsize) == -1) goto oops;
+#endif
 
 	return fd;
 oops: