group 36 bsp/drv/include/devctl.h #define _DEVC(group,num) (u_long)(((group) << 16) | (num)) group 59 include/sys/ioctl.h #define _IOC(inout,group,num,len) \ group 60 include/sys/ioctl.h (u_long)(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num)) group 37 usr/lib/posix/file/chown.c chown(const char *path, uid_t owner, gid_t group)