Make use of gcc attributes in some standard include headers.

The `nonnull' attribute specifies that some function parameters should be
non-null pointers.  This is very useful as it helps the compiler generate
warnings on suspicious code and can also enable some small optimizations.

Also start using 'alloc_size' attribute in the allocator functions.

This is an initial step to better integrate our libc with the compiler:
these attributes are fully supported by clang and they are also useful
for the static analyzer.

Note that due to some bogus internal procedure in the way gcc ports
are built they may require updating if they were built before r280801.

Relnotes:		yes
Hinted by:		Android's bionic libc
Differential Revision:	https://reviews.freebsd.org/D2107

1 files changed, 3 insertions, 3 deletions

diff --git a/include/signal.h b/include/signal.h
index dca19aa..895ccc3 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -78,10 +78,10 @@ int	sigdelset(sigset_t *, int);
 int	sigemptyset(sigset_t *);
 int	sigfillset(sigset_t *);
 int	sigismember(const sigset_t *, int);
-int	sigpending(sigset_t *);
+int	sigpending(sigset_t *) __nonnull(1);
 int	sigprocmask(int, const sigset_t * __restrict, sigset_t * __restrict);
-int	sigsuspend(const sigset_t *);
-int	sigwait(const sigset_t * __restrict, int * __restrict);
+int	sigsuspend(const sigset_t *) __nonnull(1);
+int	sigwait(const sigset_t * __restrict, int * __restrict) __nonnull_all;
 #endif
 
 #if __POSIX_VISIBLE >= 199506 || __XSI_VISIBLE >= 600