GETDOMAINNAME(3) BSD Library Functions Manual GETDOMAINNAME(3)NAME
getdomainname, setdomainname — get/set the NIS domain name of current
Standard C Library (libc, -lc)
getdomainname(char *name, int namelen);
setdomainname(const char *name, int namelen);
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-termi‐
nated 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.
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable errno is set to indicate the
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
SEE ALSOgethostid(3), gethostname(3), sysctl(3)HISTORY
The getdomainname() function appeared in 4.2BSD.
Domain names are limited to MAXHOSTNAMELEN (from <sys/param.h>) charac‐
ters, currently 256.
BSD May 6, 1994 BSD