* devices.h (FH_PROCESSFD): New device type.

* dtable.cc (build_fh_pc): Add case for FH_PROCESSFD.
	* fhandler.h (class fhandler_virtual): Drop bufalloc member.
	* fhandler_virtual.h: New header.
	* fhandler_proc.cc: Remove types proc_type_t and proc_tab_t in favor
	of types virt_type_t and virt_tab_t from fhandler_virtual.h.
	Change prototypes of format_XXX functions accordingly.
	(proc_tab): Drop size member info.
	(fhandler_proc::fill_filebuf): Don't allocate filebuf here.  Allocate
	it in the format_XXX functions.
	* fhandler_process.cc: Reorganize global process content data into a
	new struct virt_tab_t.  Accommodate throughout.
	(format_process_winexename): New function.
	(format_process_winpid): New function.
	(format_process_exename): New function.
	(format_process_root): New function.
	(format_process_cwd): New function.
	(format_process_cmdline): New function.
	(format_process_ppid): New function.
	(format_process_uid): New function.
	(format_process_pgid): New function.
	(format_process_sid): New function.
	(format_process_gid): New function.
	(format_process_ctty): New function.
	(format_process_fd): New function.
	* fhandler_procnet.cc (fhandler_procnet::fill_filebuf): Don't use
	bufalloc.
	* fhandler_registry.cc (fhandler_registry::fill_filebuf): Define
	bufalloc locally.
	* fhandler_virtual.cc (fhandler_virtual::fhandler_virtual): Drop
	initialization of bufalloc.
	(fhandler_virtual::dup): Drop copying bufalloc.

winsup/cygwin/fhandler.h

@@ -1227,7 +1227,6 @@ class fhandler_virtual : public fhandler_base
 {
  protected:
   char *filebuf;
-  size_t bufalloc;
   _off64_t filesize;
   _off64_t position;
   int fileid; // unique within each class