1 files changed, 30 insertions, 0 deletions
diff --git a/lib/libc/gen/dlfunc.c b/lib/libc/gen/dlfunc.c
new file mode 100644
index 0000000..72a683a
--- /dev/null
+++ b/lib/libc/gen/dlfunc.c
@@ -0,0 +1,30 @@
+/*
+ * This source file is in the public domain.
+ * Garrett A. Wollman, 2002-05-28.
+ *
+ * $FreeBSD$
+ */
+
+#include <dlfcn.h>
+
+/*
+ * Implement the dlfunc() interface, which behaves exactly the same as
+ * dlsym() except that it returns a function pointer instead of a data
+ * pointer.  This can be used by applications to avoid compiler warnings
+ * about undefined behavior, and is intended as prior art for future
+ * POSIX standardization.  This function requires that all pointer types
+ * have the same representation, which is true on all platforms FreeBSD
+ * runs on, but is not guaranteed by the C standard.
+ */
+dlfunc_t
+dlfunc(void * __restrict handle, const char * __restrict symbol)
+{
+	union {
+		void *d;
+		dlfunc_t f;
+	} rv;
+
+	rv.d = dlsym(handle, symbol);
+	return (rv.f);
+}
+