lib9: make safe for automatic builds

R=golang-dev, adg, bradfitz
CC=golang-dev
https://golang.org/cl/5615046

src/lib9/Makefile

@@ -85,7 +85,7 @@ LIB9OFILES=\
 
 ifeq ($(GOHOSTOS),windows)
 LIB9OFILES+=\
-	win32.$O\
+	windows.$O\
 
 else
 LIB9OFILES+=\

src/lib9/await.c

+// +build !windows
+
 /*
 Plan 9 from User Space src/lib9/await.c
 http://code.swtch.com/plan9port/src/tip/src/lib9/await.c

src/lib9/fmt/errfmt.c

-/*
- * The authors of this software are Rob Pike and Ken Thompson,
- * with contributions from Mike Burrows and Sean Dorward.
- *
- *     Copyright (c) 2002-2006 by Lucent Technologies.
- *     Portions Copyright (c) 2004 Google Inc.
- * 
- * Permission to use, copy, modify, and distribute this software for any
- * purpose without fee is hereby granted, provided that this entire notice
- * is included in all copies of any software which is or includes a copy
- * or modification of this software and in all copies of the supporting
- * documentation for such software.
- * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES 
- * NOR GOOGLE INC MAKE ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING 
- * THE MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
- */
-
-#include <u.h>
-#include <libc.h>
-#include "fmtdef.h"
-
-int
-__errfmt(Fmt *f)
-{
-	char *s;
-
-	s = strerror(errno);
-	return fmtstrcpy(f, s);
-}

src/lib9/fork.c

-/*
-Plan 9 from User Space src/lib9/fork.c
-http://code.swtch.com/plan9port/src/tip/src/lib9/fork.c
-
-Copyright 2001-2007 Russ Cox.  All Rights Reserved.
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-*/
-#include <u.h>
-#include <signal.h>
-#include <libc.h>
-#include "9proc.h"
-#undef fork
-
-int
-p9fork(void)
-{
-	int pid;
-	sigset_t all, old;
-
-	sigfillset(&all);
-	sigprocmask(SIG_SETMASK, &all, &old);
-	pid = fork();
-	if(pid == 0){
-		_clearuproc();
-		_p9uproc(0);
-	}
-	sigprocmask(SIG_SETMASK, &old, nil);
-	return pid;
-}

src/lib9/getuser.c

+// +build !windows
+
 /*
 Plan 9 from User Space src/lib9/getuser.c
 http://code.swtch.com/plan9port/src/tip/src/lib9/getuser.c

src/lib9/jmp.c

+// +build !windows
+
 /*
 Plan 9 from User Space src/lib9/jmp.c
 http://code.swtch.com/plan9port/src/tip/src/lib9/jmp.c

src/lib9/notify.c

+// +build !windows
+
 /*
 Plan 9 from User Space src/lib9/notify.c
 http://code.swtch.com/plan9port/src/tip/src/lib9/notify.c

src/lib9/rfork.c

+// +build !windows
+
 /*
 Plan 9 from User Space src/lib9/rfork.c
 http://code.swtch.com/plan9port/src/tip/src/lib9/rfork.c