Fix the handle locking in stdio
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.
Based on OpenBSD change by guenther@openbsd.org
http://www.mail-archive.com/source-changes@cvs.openbsd.org/msg01015.html
Bug: 3446659
Change-Id: Ie82116e358c541718d6709ec45ca6796be5a007b
diff --git a/libc/stdio/vasprintf.c b/libc/stdio/vasprintf.c
index 54c46b3..1630ccb 100644
--- a/libc/stdio/vasprintf.c
+++ b/libc/stdio/vasprintf.c
@@ -37,7 +37,7 @@
if (f._bf._base == NULL)
goto err;
f._bf._size = f._w = 127; /* Leave room for the NUL */
- ret = vfprintf(&f, fmt, ap);
+ ret = __vfprintf(&f, fmt, ap);
if (ret == -1)
goto err;
*f._p = '\0';