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* cxx.cc (default_cygwin_cxx_malloc): Enhance commenting.

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* dll_init.cc (dll_dllcrt0_1): Likewise.
	* dlfcn.cc (dlopen): Prevent dlopen()'d DLL from installing any
	cxx malloc overrides.
	* include/cygwin/cygwin_dll.h (__dynamically_loaded): New variable.
	* lib/_cygwin_crt0_common.cc (_cygwin_crt0_common): Check it and only
	install cxx malloc overrides when statically loaded.  Extend comments.
This commit is contained in:
Corinna Vinschen
2009-08-13 07:35:50 +00:00
parent 61189f19de
commit ce5eb135a2
6 changed files with 70 additions and 8 deletions
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19
winsup/cygwin/lib/_cygwin_crt0_common.cc
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@ -40,6 +40,9 @@ extern WEAK void operator delete[](void *p, const std::nothrow_t &nt) throw()
/* Avoid an info message from linker when linking applications. */
extern __declspec(dllimport) struct _reent *_impure_ptr;
/* Initialised in _cygwin_dll_entry. */
extern int __dynamically_loaded;
#undef environ
extern "C"
@ -70,11 +73,13 @@ _cygwin_crt0_common (MainFunc f, per_process *u)
per_process *newu = (per_process *) cygwin_internal (CW_USER_DATA);
int uwasnull;
/* u is non-NULL if we are in a DLL, and NULL in the main exe.
newu is the Cygwin DLL's internal per_process and never NULL. */
if (u != NULL)
uwasnull = 0; /* Caller allocated space for per_process structure. */
else
{
u = newu; /* Using DLL built-in per_process. */
u = newu; /* Using DLL built-in per_process. */
uwasnull = 1; /* Remember for later. */
}
@ -114,8 +119,10 @@ _cygwin_crt0_common (MainFunc f, per_process *u)
u->realloc = &realloc;
u->calloc = &calloc;
/* Likewise for the C++ memory operators - if any. */
if (newu && newu->cxx_malloc)
/* Likewise for the C++ memory operators, if any, but not if we
were dlopen()'d, as we might get dlclose()'d and that would
leave stale function pointers behind. */
if (newu && newu->cxx_malloc && !__dynamically_loaded)
{
/* Inherit what we don't override. */
#define CONDITIONALLY_OVERRIDE(MEMBER) \
@ -129,12 +136,10 @@ _cygwin_crt0_common (MainFunc f, per_process *u)
CONDITIONALLY_OVERRIDE(oper_new___nt);
CONDITIONALLY_OVERRIDE(oper_delete_nt);
CONDITIONALLY_OVERRIDE(oper_delete___nt);
/* Now update the resulting set into the global redirectors. */
*newu->cxx_malloc = __cygwin_cxx_malloc;
}
/* Now update the resulting set into the global redirectors. */
if (newu)
newu->cxx_malloc = &__cygwin_cxx_malloc;
/* Setup the module handle so fork can get the path name. */
u->hmodule = GetModuleHandle (0);