getdomainname, setdomainname - get or set name of current
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 is bootstrapped.
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 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 is stored.
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, errno.
The name parameter contains an invalid address. The
caller was not the superuser. This error message only
applies to the setdomainname system call.
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