Section (2) getdomainname
getdomainname, setdomainname — get/set NIS domain name
||const char *name,|
These functions are used to access or to change the NIS domain name of the host system. More precisely, they operate on the NIS domain name associated with the calling process_zsingle_quotesz_s UTS namespace.
setdomainname() sets the
domain name to the value given in the character array
len argument specifies the
number of bytes in
name does not require a
terminating null byte.)
getdomainname() returns the
null-terminated domain name in the character array
name, which has a length of
len bytes. If the
null-terminated domain name requires more than
getdomainname() returns the first
len bytes (glibc) or
gives an error (libc).
On success, zero is returned. On error, −1 is
errno is set
setdomainname() can fail
with the following errors:
namepointed outside of user address space.
lenwas negative or too large.
The caller did not have the
CAP_SYS_ADMINcapability in the user namespace associated with its UTS namespace (see namespaces(7)).
getdomainname() can fail
with the following errors:
getdomainname() under libc:
nameis NULL or
nameis longer than
Since Linux 1.0, the limit on the length of a domain name, including the terminating null byte, is 64 bytes. In older kernels, it was 8 bytes.
On most Linux architectures (including x86), there is no
getdomainname() system call;
instead, glibc implements
getdomainname() as a library function that
returns a copy of the
domainname field returned
from a call to uname(2).
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Copyright 1993 Rickard E. Faith (faithcs.unc.edu)
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Modified 1997-08-25 by Nicolás Lichtmaier <nickdebian.org>
Modified 2004-06-17 by Michael Kerrisk <mtk.manpagesgmail.com>
Modified 2008-11-27 by mtk