getdomainname man page on DigitalUNIX

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getdomainname(2)					      getdomainname(2)

       getdomainname, setdomainname - get or set name of current domain

       getdomainname(name, namelen)
	       char *name;
	       int namelen;

       setdomainname(name, namelen)
	       char *name;
	       int namelen;

       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 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
       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 loca‐
       tion, errno.

       The name parameter contains an invalid address.	The caller was not the
       superuser.  This error message only applies to the setdomainname system


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