* child_info.h (CURR_CHILD_INFO_MAGIC): Update.

	(class child_info_fork): Remove stacksize, add stackaddr and guardsize
	members.
	* dcrt0.cc (child_info_fork::alloc_stack_hard_way): Partial rewrite
	to regenerate the stack exactly as in the parent.
	(child_info_fork::alloc_stack): Set stackaddr to 0, rather than
	stacksize.
	(dll_crt0_1): Check for stackaddr before changing the stack addresses
	in the TEB.
	* fork.cc (frok::child): Check for stackaddr here.
	(frok::parent): Set ch.stackaddr and ch.guardsize if not called from
	the main thread.
	* init.cc (dll_entry): Replace pointer to NT_TIB with pointer to TEB.
	Fix incorrectly changed address test before removing _my_tls.
	Set StackLimit to NULL on Windows 2000.  Explain why.
	* miscfuncs.cc (struct thread_wrapper_arg): Store stackbase rather
	than stacksize, store commitaddr, remove guardsize.  Store all pointers
	as char * for easier address arithmetic.
	(thread_wrapper): Rewrite to remove OS stack before calling thread
	function.  Add lots of comments to explain what we do.
	(CygwinCreateThread): Reserve our own stack in case we got no
	application stack.  Add comments.
	* ntdll.h (struct _TEB): Extend defintion up to DeallocationStack
	member.
	* thread.cc (pthread_attr::pthread_attr): Use "(size_t) -1"
	rather then 0xffffffff.
	* wincap.h (wincaps::has_stack_size_param_is_a_reservation): New
	element.
	* wincap.cc: Implement above element throughout.

1 files changed, 4 insertions, 2 deletions

diff --git a/winsup/cygwin/child_info.h b/winsup/cygwin/child_info.h
index 44767edc9..2bf89c183 100644
--- a/winsup/cygwin/child_info.h
+++ b/winsup/cygwin/child_info.h
@@ -37,7 +37,7 @@ enum child_status
 #define EXEC_MAGIC_SIZE sizeof(child_info)
 
 /* Change this value if you get a message indicating that it is out-of-sync. */
-#define CURR_CHILD_INFO_MAGIC 0xe850717aU
+#define CURR_CHILD_INFO_MAGIC 0xbdf5842aU
 
 /* NOTE: Do not make gratuitous changes to the names or organization of the
    below class.  The layout is checksummed to determine compatibility between
@@ -80,10 +80,12 @@ class child_info_fork: public child_info
 {
 public:
   HANDLE forker_finished;// for synchronization with child
-  DWORD stacksize;	// size of parent stack
   jmp_buf jmp;		// where child will jump to
+  void *stackaddr;	// address of parent stack
   void *stacktop;	// location of top of parent stack
   void *stackbottom;	// location of bottom of parent stack
+  size_t guardsize;     // size of POSIX guard region or (size_t) -1 if
+			// user stack
   char filler[4];
   child_info_fork ();
   void handle_fork () __attribute__ ((regparm (1)));;