* cygheap.h (init_cygheap): New struct holding values that live in the Cygwin

heap.
* child_info.h (child_info): Change pointer type of cygheap to init_cygheap.
* cygheap.cc (init_cheap): Point cygheap_max after contents of cygheap.  Move
some stuff into cygheap.h.
* dir.cc (opendir): Change to use root and rootlen in cygheap rather than in
myself.
(mkdir): Change to use umask in cygheap rather than in myself.
* path.cc: Ditto, throughout.
* syscalls.cc (_open): Ditto.  Change to use umask in cygheap rather than in
myself.
(chroot): Change to allocate root dir on the cygwin heap.
(umask): Change to use umask in cygheap rather than in myself.
(cygwin_bind): Ditto.
* sigproc.cc (proc_subproc): Don't copy umask or root stuff as this happens
automatically now.
* pinfo.h (_pinfo): Migrate stuff out of here and into init_cheap.
* dcrt0.cc (dll_crt0_1): Call cygheap_init later in startup for first cygwin
process.

winsup/cygwin/dcrt0.cc

@@ -654,7 +654,6 @@ dll_crt0_1 ()
 
   threadname_init ();
   debug_init ();
-  cygheap_init ();	/* Initialize cygheap muto */
 
   regthread ("main", GetCurrentThreadId ());
   mainthread.init ("mainthread"); // For use in determining if signals
@@ -734,6 +733,9 @@ dll_crt0_1 ()
   /* Initialize events. */
   events_init ();
 
+  if (!child_proc_info)
+    cygheap_init ();
+
   cygcwd.init ();
 
   cygbench ("pre-forkee");
@@ -861,14 +863,6 @@ dll_crt0_1 ()
 extern "C" void __stdcall
 _dll_crt0 ()
 {
-  char zeros[sizeof (fork_info->zero)] = {0};
-#ifdef DEBUGGING
-  strace.microseconds ();
-#endif
-
-  /* Set the os_being_run global. */
-  set_os_type ();
-
 #ifdef DEBUGGING
   char buf[80];
   if (GetEnvironmentVariable ("CYGWIN_SLEEP", buf, sizeof (buf)))
@@ -878,7 +872,16 @@ _dll_crt0 ()
     }
 #endif
 
+  char zeros[sizeof (fork_info->zero)] = {0};
+#ifdef DEBUGGING
+  strace.microseconds ();
+#endif
+
+  /* Set the os_being_run global. */
+  set_os_type ();
+
   main_environ = user_data->envptr;
+  *main_environ = NULL;
   user_data->heapbase = user_data->heapptr = user_data->heaptop = NULL;
 
   set_console_handler ();