freebsd man page for getdomainname

GETDOMAINNAME(3)					   BSD Library Functions Manual 					  GETDOMAINNAME(3)

NAME
     getdomainname, setdomainname -- get/set the NIS domain name of current host

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     getdomainname(char *name, int namelen);

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

DESCRIPTION
     The getdomainname() function returns the standard NIS domain name for the current host, as previously set by setdomainname().  The namelen
     argument specifies the size of the name array.  The returned name is null-terminated unless insufficient space is provided.

     The setdomainname() function sets the NIS domain 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.

RETURN VALUES
     Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS
     The following errors may be returned by these calls:

     [EFAULT]		The name or namelen argument gave an invalid address.

     [EPERM]		The caller tried to set the hostname and was not the super-user.

SEE ALSO
     gethostid(3), gethostname(3), sysctl(3)

HISTORY
     The getdomainname() function appeared in 4.2BSD.

BUGS
     Domain names are limited to MAXHOSTNAMELEN (from <sys/param.h>) characters, currently 256.

BSD
								    May 6, 1994 							       BSD