Fix the handle locking in stdio to use flockfile/funlockfile

internally when and where required.  Macros in <stdio.h> are updated
to automatically call the underlying functions when the process is
threaded to obtain the necessary locking.  A private mutex is added
to protect __sglue, the internal list of FILE handles, and another
to protect the one-time initialization.  Some routines in libc that
use getc() change to use getc_unlocked() as they're either protected
by their own lock or aren't thread-safe routines anyway.

ok kurt@, earlier version tested by sthen@ and jj@

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/libc/stdio/getc.c b/lib/libc/stdio/getc.c
index cdd572215bd..8a1f8c9e510 100644
--- a/lib/libc/stdio/getc.c
+++ b/lib/libc/stdio/getc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: getc.c,v 1.6 2005/08/08 08:05:36 espie Exp $ */
+/*	$OpenBSD: getc.c,v 1.7 2009/10/21 16:04:23 guenther Exp $ */
 /*-
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -32,6 +32,7 @@
  */
 
 #include <stdio.h>
+#include "local.h"
 
 /*
  * A subroutine version of the macro getc_unlocked.
@@ -54,8 +55,8 @@ getc(FILE *fp)
 {
 	int c;
 
-	flockfile(fp);
+	FLOCKFILE(fp);
 	c = __sgetc(fp);
-	funlockfile(fp);
+	FUNLOCKFILE(fp);
 	return (c);
 }