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FreeBSD 11.0 - man page for getdomainname (freebsd section 3)

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