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-rw-r--r--misc/sys/cdefs.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 1a9b0e78a1..8894d0d5fc 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -242,6 +242,14 @@
# define __attribute_format_strfmon__(a,b) /* Ignore */
#endif
+/* The nonull function attribute allows to mark pointer parameters which
+ must not be NULL. */
+#if __GNUC_PREREQ (3,3)
+# define __nonnull(params) __attribute__ ((__nonnull__ params))
+#else
+# define __nonnull(params)
+#endif
+
/* It is possible to compile containing GCC extensions even if GCC is
run in pedantic mode if the uses are carefully marked using the
`__extension__' keyword. But this is not generally available before