Author: pfg
Date: Mon Jun 29 00:30:30 2015
New Revision: 284917
URL: https://svnweb.freebsd.org/changeset/base/284917
Log:
Add a new __sentinel attribute.
The sentinel attribute was originally implemented in OpenBSD's gcc and
later adopted by upstream GCC 4.0 (and clang). From the OpenBSD's
gcc-local manpage:
- gcc recognizes the extra attribute __sentinel__, which can be used to
mark varargs function that need a NULL pointer to mark argument
termination, like execl(3). This exposes latent bugs for 64-bit
architectures, where a terminating 0 will expand to a 32-bit int, and
not a full-fledged 64-bits pointer.
While here sort the visibility attributes.
Hinted-by: OpenBSD
Modified:
head/sys/sys/cdefs.h
Modified: head/sys/sys/cdefs.h
==============================================================================
--- head/sys/sys/cdefs.h Sun Jun 28 21:36:00 2015 (r284916)
+++ head/sys/sys/cdefs.h Mon Jun 29 00:30:30 2015 (r284917)
@@ -469,11 +469,13 @@
#endif
#if __GNUC_PREREQ__(4, 0)
-#define __hidden __attribute__((__visibility__("hidden")))
+#define __sentinel __attribute__((__sentinel__))
#define __exported __attribute__((__visibility__("default")))
+#define __hidden __attribute__((__visibility__("hidden")))
#else
-#define __hidden
+#define __sentinel
#define __exported
+#define __hidden
#endif
/*
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