FreeBSD misc: add a macro to turn on NETGRAPH option and return error when call sleep

lib/Makefile

@@ -109,7 +109,9 @@ VPATH+= $S/crypto/rijndael
 VPATH+= $S/crypto/sha2
 VPATH+= $S/crypto/siphash
 VPATH+= $S/net
+ifdef FF_NETGRAPH
 VPATH+= $S/netgraph
+endif
 VPATH+= $S/netinet
 VPATH+= $S/netinet/libalias
 VPATH+= $S/netinet/cc
@@ -266,6 +268,7 @@ NET_SRCS+=		 \
 	rtsock.c         \
 	slcompress.c
 
+ifdef FF_NETGRAPH
 NETGRAPH_SRCS +=         \
 	ng_async.c       \
 	ng_atmllc.c      \
@@ -311,6 +314,7 @@ NETGRAPH_SRCS +=         \
 	ng_UI.c          \
 	ng_vjc.c         \
 	ng_vlan.c
+endif
 
 NETINET_SRCS+=		\
 	if_ether.c	\

lib/ff_glue.c

@@ -1096,6 +1096,7 @@ foffset_lock(struct file *fp, int flags)
      */
     mtxp = mtx_pool_find(mtxpool_sleep, fp);
     mtx_lock(mtxp);
+    /*
     if ((flags & FOF_NOLOCK) == 0) {
         while (fp->f_vnread_flags & FOFFSET_LOCKED) {
             fp->f_vnread_flags |= FOFFSET_LOCK_WAITING;
@@ -1104,6 +1105,7 @@ foffset_lock(struct file *fp, int flags)
         }
         fp->f_vnread_flags |= FOFFSET_LOCKED;
     }
+    */
     res = fp->f_offset;
     mtx_unlock(mtxp);
     return (res);

lib/ff_kern_synch.c

@@ -88,7 +88,7 @@ _sleep(void *ident, struct lock_object *lock, int priority,
     const char *wmesg, sbintime_t sbt, sbintime_t pr, int flags)
 {
     //FIXME:we couldn't really sleep.
-    return (0);
+    return (EPERM);
 }