getdomainname(name, namelen) char *name; int namelen; setdomainname(name, namelen) char *name; int namelen;
Getdomainname returns the name of the domain for the current processor, as previously set by setdomainname. The parameter namelen specifies the size of the name array. The returned name is null-terminated unless insufficient space is provided.
Setdomainname sets the domain of the host machine to be name, which has length namelen. This call is restricted to the super-user and is normally used only when the system is bootstrapped.
The purpose of domains is to enable two distinct networks that may have host names in common to merge. Each network would be distinguished by having a different domain name. At the current time, only the yellow pages service makes use of domains.