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* dcrt0.cc (child_info_fork::alloc_stack_hard_way): Fix datatype of 

stacksize to SIZE_T.  Cast to SIZE_T in pointer arithmetic.  Slightly
	enhance output in case of a fatal error.
	* fork.cc (frok::parent): Always set ch.stackaddr to DeallocationStack
	value of current thread to help stack reservation in
	child_info_fork::alloc_stack_hard_way along.  Simplify subsequent code
	storing stack values in ch.  Print guardsize in hex, too.
This commit is contained in:
Corinna Vinschen 2013-05-23 20:10:35 +00:00
parent df7a7e2e82
commit c6696a3426
3 changed files with 27 additions and 18 deletions
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10
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,13 @@
2013-05-23 Corinna Vinschen <corinna@vinschen.de>
* dcrt0.cc (child_info_fork::alloc_stack_hard_way): Fix datatype of
stacksize to SIZE_T. Cast to SIZE_T in pointer arithmetic. Slightly
enhance output in case of a fatal error.
* fork.cc (frok::parent): Always set ch.stackaddr to DeallocationStack
value of current thread to help stack reservation in
child_info_fork::alloc_stack_hard_way along. Simplify subsequent code
storing stack values in ch. Print guardsize in hex, too.
2013-05-23 Corinna Vinschen <corinna@vinschen.de>
* environ.cc (set_winsymlinks): Handle "winsymlinks:nativestrict"

17
winsup/cygwin/dcrt0.cc
View File

@ -405,7 +405,7 @@ void
child_info_fork::alloc_stack_hard_way (volatile char *b)
{
void *stack_ptr;
DWORD stacksize;
SIZE_T stacksize;
/* First check if the requested stack area is part of the user heap
or part of a mmapped region. If so, we have been started from a
@ -415,16 +415,19 @@ child_info_fork::alloc_stack_hard_way (volatile char *b)
&& stackbottom <= cygheap->user_heap.max)
|| is_mmapped_region ((caddr_t) stacktop, (caddr_t) stackbottom))
return;
/* First, try to reserve the entire stack. */
stacksize = (char *) stackbottom - (char *) stackaddr;
stacksize = (SIZE_T) stackbottom - (SIZE_T) stackaddr;
if (!VirtualAlloc (stackaddr, stacksize, MEM_RESERVE, PAGE_NOACCESS))
api_fatal ("fork: can't reserve memory for stack %p - %p, %E",
stackaddr, stackbottom);
stacksize = (char *) stackbottom - (char *) stacktop;
{
PTEB teb = NtCurrentTeb ();
api_fatal ("fork: can't reserve memory for parent stack "
"%p - %p, (child has %p - %p), %E",
stackaddr, stackbottom, teb->DeallocationStack, _tlsbase);
}
stacksize = (SIZE_T) stackbottom - (SIZE_T) stacktop;
stack_ptr = VirtualAlloc (stacktop, stacksize, MEM_COMMIT, PAGE_READWRITE);
if (!stack_ptr)
abort ("can't commit memory for stack %p(%d), %E", stacktop, stacksize);
abort ("can't commit memory for stack %p(%ly), %E", stacktop, stacksize);
if (guardsize != (size_t) -1)
{
/* Allocate PAGE_GUARD page if it still fits. */

18
winsup/cygwin/fork.cc
View File

@ -302,17 +302,17 @@ frok::parent (volatile char * volatile stack_here)
ch.forker_finished = forker_finished;
PTEB teb = NtCurrentTeb ();
ch.stackbottom = _tlsbase;
ch.stacktop = (void *) _tlstop;
ch.stackaddr = 0;
ch.stackaddr = teb->DeallocationStack;
ch.guardsize = 0;
if (&_my_tls != _main_tls)
{
/* We have not been started from the main thread. Fetch the
information required to set up the thread stack identically
in the child. */
PTEB teb = NtCurrentTeb ();
if (!teb->DeallocationStack)
if (!ch.stackaddr)
{
/* Pthread with application-provided stack. Don't set up a
PAGE_GUARD page. guardsize == -1 is used in alloc_stack_hard_way
@ -320,15 +320,11 @@ frok::parent (volatile char * volatile stack_here)
ch.stackaddr = _my_tls.tid->attr.stackaddr;
ch.guardsize = (size_t) -1;
}
else
{
ch.stackaddr = teb->DeallocationStack;
/* If it's a pthread, fetch guardsize from thread attributes. */
if (_my_tls.tid)
ch.guardsize = _my_tls.tid->attr.guardsize;
}
else if (_my_tls.tid)
/* If it's a pthread, fetch guardsize from thread attributes. */
ch.guardsize = _my_tls.tid->attr.guardsize;
}
debug_printf ("stack - bottom %p, top %p, addr %p, guardsize %lu",
debug_printf ("stack - bottom %p, top %p, addr %p, guardsize %ly",
ch.stackbottom, ch.stacktop, ch.stackaddr, ch.guardsize);
PROCESS_INFORMATION pi;