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 res-
tricted to the superuser and is normally used only when the system is
The purpose of domains is to allow merging of two distinct networks that
have common host names. Each network can be distinguished by having a dif-
ferent domain name. At the current time, only the Network Information Ser-
vice (NIS) makes use of domains.
The name argument is the address where the name of the current domain is
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 location,
The name parameter contains an invalid address.
The caller was not the superuser. This error message only applies to
the setdomainname system call.