+/*
+ * Marshal a handle so that it can be transferred between processes
+ */
+Uint64 VFS_MarshalHandle(int FD)
+{
+ tVFS_Handle *h = VFS_GetHandle(FD);
+ if(!h || !h->Node) {
+ errno = EBADF;
+ return -1;
+ }
+
+ // Allocate marshal location
+ int ret = -1;
+ Mutex_Acquire(&glVFS_MarshalledHandles);
+ for( int i = 0; i < MAX_MARSHALLED_HANDLES; i ++ )
+ {
+ tVFS_MarshalledHandle* mh = &gaVFS_MarshalledHandles[i];
+ if( mh->Handle.Node == NULL ) {
+ mh->Handle.Node = h->Node;
+ mh->AllocTime = now();
+ ret = i;
+ }
+ if( now() - mh->AllocTime > 2000 ) {
+ Log_Notice("VFS", "TODO: Expire marshalled handle");
+ }
+ }
+ Mutex_Release(&glVFS_MarshalledHandles);
+ if( ret < 0 ) {
+ // TODO: Need to clean up lost handles to avoid DOS
+ Log_Warning("VFS", "Out of marshaled handle slots");
+ errno = EAGAIN;
+ return -1;
+ }
+
+ // Populate
+ tVFS_MarshalledHandle* mh = &gaVFS_MarshalledHandles[ret];
+ mh->Handle = *h;
+ _ReferenceMount(h->Mount, "MarshalHandle");
+ _ReferenceNode(h->Node);
+ mh->Magic = rand();
+
+ return (Uint64)mh->Magic << 32 | ret;
+}
+
+/*
+ * Un-marshal a handle into the current process
+ * NOTE: Does not support unmarshalling into kernel handle list
+ */
+int VFS_UnmarshalHandle(Uint64 Handle)
+{
+ Uint32 magic = Handle >> 32;
+ int id = Handle & 0xFFFFFFFF;
+
+ // Range check
+ if( id >= MAX_MARSHALLED_HANDLES ) {
+ LOG("ID too high (%i > %i)", id, MAX_MARSHALLED_HANDLES);
+ errno = EINVAL;
+ return -1;
+ }
+
+
+ // Check validity
+ tVFS_MarshalledHandle *mh = &gaVFS_MarshalledHandles[id];
+ if( mh->Handle.Node == NULL ) {
+ LOG("Target node is NULL");
+ errno = EINVAL;
+ return -1;
+ }
+ if( mh->Magic != magic ) {
+ LOG("Magic mismatch (0x%08x != 0x%08x)", magic, mh->Magic);
+ errno = EACCES;
+ return -1;
+ }
+
+ Mutex_Acquire(&glVFS_MarshalledHandles);
+ // - Create destination handle
+ int ret = VFS_AllocHandle(true, mh->Handle.Node, mh->Handle.Mode);
+ // - Clear allocation
+ mh->Handle.Node = NULL;
+ Mutex_Release(&glVFS_MarshalledHandles);
+ if( ret == -1 ) {
+ errno = ENFILE;
+ return -1;
+ }
+
+ // No need to reference node/mount, new handle takes marshalled reference
+
+ return ret;
+}
+