* exceptions.cc (call_handler): Make signal pending if sigsave.sig is still

active.
* syscalls.cc (_read): Don't clear errno.
* sigproc.cc (wait_sig): Don't scan the waiting process list after a SIGCHLD if
there are no zombies to reap.
* winsup.h: Use __builtin_strcmp.
* environ.cc (posify): Don't initialize len unless it is required
(from DJ Delorie <dj@redhat.com>).

winsup/cygwin/exceptions.cc

@@ -216,7 +216,7 @@ public:
 
 /* This is the main stack frame info for this process. */
 static NO_COPY stack_info thestack;
-signal_dispatch sigsave;
+static signal_dispatch sigsave;
 
 /* Initialize everything needed to start iterating. */
 void
@@ -711,6 +711,9 @@ call_handler (int sig, struct sigaction& siga, void *handler)
 
   mainthread.lock->acquire ();
 
+  if (sigsave.sig)
+    goto set_pending;
+
   if (mainthread.frame)
     {
       ebp = mainthread.frame;