user IDs. Subsequently, Linux 2.4 added setfsuid32 () supporting 32-bit IDs. The glibc setfsuid () wrapperuser IDs. Subsequently, Linux 2.4 added setfsuid32 () supporting 32-bit IDs. The glibc setfsuid () wrappersetfsgid32 (2) 2.4 setfsuid (2) 1.2 setfsuid32 (2) 2.4 setgid (2) 1.0 setgid32