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/fputs.c b/libc/stdio/fputs.c
index 7434ca8..c2462ba 100644
--- a/libc/stdio/fputs.c
+++ b/libc/stdio/fputs.c
@@ -44,11 +44,15 @@
{
struct __suio uio;
struct __siov iov;
+ int ret;
iov.iov_base = (void *)s;
iov.iov_len = uio.uio_resid = strlen(s);
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
+ FLOCKFILE(fp);
_SET_ORIENTATION(fp, -1);
- return (__sfvwrite(fp, &uio));
+ ret = __sfvwrite(fp, &uio);
+ FUNLOCKFILE(fp);
+ return (ret);
}