The gethostname function returns the standard host name for the current processor, as previously set by sethostname. The namelen argument specifies the size of the name array. The returned name is null-terminated unless insufficient space is provided.
The sethostname function sets the name 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.
Host names are limited to
.Brq Dv HOST_NAME_MAX characters, not including the trailing null, currently 255.
The following errors may be returned by these calls: