* dcrt0.cc (dll_crt0_0): Call SetErrorMode earlier.

* pinfo.cc (_pinfo::dup_proc_pipe): Reset wr_proc_pipe on failure.  Return
previous pipe handle.
* pinfo.h (_pinfo::dup_proc_pipe): Reflect change to return value.
* spawn.cc (spawn_guts): Restore previous proc pipe on retry or if process
exits before synchronization.

winsup/cygwin/dcrt0.cc

@@ -702,6 +702,8 @@ dll_crt0_0 ()
   init_global_security ();
   initial_env ();
 
+  SetErrorMode (SEM_FAILCRITICALERRORS);
+
   /* Initialize signal processing here, early, in the hopes that the creation
      of a thread early in the process will cause more predictability in memory
      layout for the main thread. */
@@ -727,7 +729,6 @@ dll_crt0_0 ()
   if (wincap.has_security ())
     OpenProcessToken (hMainProc, MAXIMUM_ALLOWED, &hProcToken);
 
-  SetErrorMode (SEM_FAILCRITICALERRORS);
   device::init ();
   do_global_ctors (&__CTOR_LIST__, 1);
   cygthread::init ();