getdomainname, setdomainname - get or set name of current domain
The getdomainname system call returns the domain name of the current
host, as set by setdomainname.
The setdomainname system call sets the domain of the host machine to be
name, which has a length specified by namelen. This system call is
restricted to the superuser and is normally used only when the system
The purpose of domains is to allow merging of two distinct networks
that have common host names. Each network can be distinguished by hav‐
ing a different domain name. At the current time, only the Network
Information Service (NIS) makes use of domains.
The name argument is the address where the name of the current domain
The namelen argument specifies the size of the name array. The
returned name is null-terminated unless insufficient space is provided.
Domain names are limited to 64 characters.
If the call succeeds, a value of 0 is returned. If the call fails, a
value of -1 is returned and an error code is placed in the global loca‐
The name parameter contains an invalid address. The caller was not the
superuser. This error message only applies to the setdomainname system