* Makefile.in (DLL_OFILES): Add tls_pbuf.o.

* autoload.cc (CreateDesktopW): Replace CreateDesktopA.
	(CreateWindowStationW): Replace CreateWindowStationA.
	(GetUserObjectInformationW): Replace GetUserObjectInformationA.
	* cygheap.h (cwdstuff::get): Assume default buffer size NT_MAX_PATH.
	* cygtls.cc (_cygtls::remove): Free temporary TLS path buffers.
	* cygtls.h (TP_NUM_C_BUFS): Define.
	(TP_NUM_W_BUFS): Define.
	(class tls_pathbuf): New class to store pointers to thread local
	temporary path buffers.
	(_local_storage::pathbufs): New member.
	* environ.cc (win_env::add_cache): Use temporary TLS path buffer instead
	of stack based buffer.
	(posify): Get temporary outenv buffer from calling function.
	(environ_init): Create temporary TLS path buffer for posify.
	(build_env): Create Windows environment block as WCHAR buffer.
	* environ.h (build_env): Change declaration accordingly.
	* external.cc (sync_winenv): Accommodate build_env change.
	* fhandler_console.cc (fhandler_console::need_invisible): Use
	GetUserObjectInformationW and CreateWindowStationW.
	* fhandler_process.cc (format_process_maps): Use temporary TLS path
	buffer instead of stack based buffer.
	* fork.cc (frok::parent): Convert to use CreateProcessW.
	* path.cc: Throughout use temporary TLS path buffers instead of stack
	based buffer.  Replace checks for CYG_MAX_PATH by checks for
	NT_MAX_PATH.
	(getfileattr): New function to replace GetFileAttributesA.
	(normalize_win32_path): Remove Win32 and NT long path prefixes.
	(getwd): Assume PATH_MAX + 1 buffer per SUSv3.
	* path.h (class path_conv): Set path buffer to size NT_MAX_PATH.
	(iswdrive): Define.
	* pinfo.cc (commune_process): Use temporary TLS path buffer instead of
	stack based buffer.
	* registry.cc (get_registry_hive_path): Ditto.
	(load_registry_hive): Ditto.
	* spawn.cc (spawn_guts): Convert to use CreateProcessW and
	CreateProcessAsUserW.
	(av::fixup): Open/close file using NtOpenFile/NtClose.
	* syscalls.cc (mknod_worker): Allow PATH_MAX file name.
	(mknod32): Ditto.
	(getusershell): Ditto.
	* tls_pbuf.cc: New file implementing tls_pathbuf and tmp_pathbuf
	methods.
	* tls_pbuf.h: New header for files using tmp_pathbuf.
	* tlsoffsets.h: Regenerate.
	* winsup.h (NT_MAX_PATH): Define as 32767 to avoid USHORT overflow.

winsup/cygwin/tls_pbuf.cc

@@ -0,0 +1,60 @@
+/* tls_pbuf.cc
+
+   Copyright 2008 Red Hat, Inc.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#include <winsup.h>
+#include <malloc.h>
+#include "thread.h"
+#include "cygtls.h"
+#include "tls_pbuf.h"
+
+#define tls_pbuf	_my_tls.locals.pathbufs
+
+void
+tls_pathbuf::destroy ()
+{
+  for (int i = 0; i < TP_NUM_C_BUFS; ++i)
+    if (c_buf[i])
+      free (c_buf[i]);
+  for (int i = 0; i < TP_NUM_W_BUFS; ++i)
+    if (w_buf[i])
+      free (w_buf[i]);
+}
+
+tmp_pathbuf::tmp_pathbuf ()
+: c_buf_old (tls_pbuf.c_cnt),
+  w_buf_old (tls_pbuf.w_cnt)
+{}
+
+tmp_pathbuf::~tmp_pathbuf ()
+{
+  tls_pbuf.c_cnt = c_buf_old;
+  tls_pbuf.w_cnt = w_buf_old;
+}
+
+char *
+tmp_pathbuf::c_get ()
+{
+  if (tls_pbuf.c_cnt >= TP_NUM_C_BUFS)
+    api_fatal ("Internal error: TP_NUM_C_BUFS too small.");
+  if (!tls_pbuf.c_buf[tls_pbuf.c_cnt]
+      && !(tls_pbuf.c_buf[tls_pbuf.c_cnt] = (char *) malloc (NT_MAX_PATH)))
+    api_fatal ("Internal error: Out of memory for new path buf.");
+  return tls_pbuf.c_buf[tls_pbuf.c_cnt++];
+}
+
+PWCHAR
+tmp_pathbuf::w_get ()
+{
+  if (tls_pbuf.w_cnt >= TP_NUM_W_BUFS)
+    api_fatal ("Internal error: TP_NUM_W_BUFS too small.");
+  if (!tls_pbuf.w_buf[tls_pbuf.w_cnt]
+      && !(tls_pbuf.w_buf[tls_pbuf.w_cnt]
+	   = (PWCHAR) malloc (NT_MAX_PATH * sizeof (WCHAR))))
+    api_fatal ("Internal error: Out of memory for new wide path buf.");
+  return tls_pbuf.w_buf[tls_pbuf.w_cnt++];
+}