SYS_NMLN
char sysname[SYS_NMLN]; /* Name of this OS. */
char nodename[SYS_NMLN]; /* Name of this network node. */
char release[SYS_NMLN]; /* Release level. */
char version[SYS_NMLN]; /* Version level. */
char machine[SYS_NMLN]; /* Hardware type. */