Reset value of uuid variable to the null value
#include <uuid.h> void uuid_clear(uuid_t uu);
The uuid_clear function sets the value of the supplied uuid variable uu to the NULL value.
Theodore Y. Ts'o
libuuid is part of the util-linux package since version 2.15.1 and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.