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GETDOMAINNAME(3) Library Functions Manual GETDOMAINNAME(3)

getdomainname, setdomainname
get/set YP domain name of current host

#include <unistd.h>
int
getdomainname(char *name, size_t namelen);
int
setdomainname(const char *name, size_t namelen);

The getdomainname() function returns the YP domain name for the current processor, as previously set by setdomainname(). The parameter namelen specifies the size of the name array. If insufficient space is provided, the returned name is truncated. The returned name is always NUL terminated.
setdomainname() sets the domain name of the host machine to be name, which has length namelen. This call is restricted to the superuser and is normally used only when the system is bootstrapped.

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 variable errno.

The following errors may be returned by these calls:
 
 
[]
The name parameter gave an invalid address.
 
 
[]
The caller tried to set the domain name and was not the superuser.

domainname(1), gethostid(3), gethostname(3), sysctl(3), sysctl(8), yp(8)

The getdomainname function call appeared in SunOS 3.x.

Domain names are limited to MAXHOSTNAMELEN (from <sys/param.h>) characters, currently 256. This includes the terminating NUL character.
If the buffer passed to getdomainname() is too small, other operating systems may not guarantee termination with NUL.
January 21, 2014 OpenBSD-5.8