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, 1 deletions

diff --git a/lib/libc/stdio/setvbuf.c b/lib/libc/stdio/setvbuf.c
index 9b92bf08113..21db80dbbdb 100644
--- a/lib/libc/stdio/setvbuf.c
+++ b/lib/libc/stdio/setvbuf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: setvbuf.c,v 1.8 2005/08/08 08:05:36 espie Exp $ */
+/*	$OpenBSD: setvbuf.c,v 1.9 2009/10/21 16:04:23 guenther Exp $ */
 /*-
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -61,6 +61,7 @@ setvbuf(FILE *fp, char *buf, int mode, size_t size)
 	 * malloc()ed.  We also clear any eof condition, as if this were
 	 * a seek.
 	 */
+	FLOCKFILE(fp);
 	ret = 0;
 	(void)__sflush(fp);
 	if (HASUB(fp))
@@ -107,6 +108,7 @@ nbf:
 			fp->_w = 0;
 			fp->_bf._base = fp->_p = fp->_nbuf;
 			fp->_bf._size = 1;
+			FUNLOCKFILE(fp);
 			return (ret);
 		}
 		flags |= __SMBF;
@@ -145,6 +147,7 @@ nbf:
 		/* begin/continue reading, or stay in intermediate state */
 		fp->_w = 0;
 	}
+	FUNLOCKFILE(fp);
 	__atexit_register_cleanup(_cleanup);
 
 	return (ret);