* cygrun.c (main): Fix compiler warning.

* gmon.c (_mcleanup): Ditto.
* profil.c (profile_off): Ditto.
* net.cc (find_winsock_errno): New function.
(__set_winsock_errno): Use find_winsock_errno.
(cygwin_setsockopt): Detect SO_ERROR for debugging.
(cygwin_getsockopt): Ditto.  Translate error when getsockopt returns SO_ERROR.
* winsup.h: regparmize __set_winsock_errno.
* include/sys/strace.h: Document that strace functions can't use regparm.

winsup/cygwin/profil.c

@@ -98,7 +98,7 @@ profile_off (struct profinfo *p)
 static int
 profile_on (struct profinfo *p)
 {
-  int thrid;
+  DWORD thrid;
 
   /* get handle for this thread */
   if (!DuplicateHandle (GetCurrentProcess (), GetCurrentThread (),