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-.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified 1997-08-25 by Nicolás Lichtmaier <nick@debian.org>
-.\" Modified 2004-06-17 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\" Modified 2008-11-27 by mtk
-.\"
-.TH getdomainname 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-getdomainname, setdomainname \- get/set NIS domain name
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "int getdomainname(char *" name ", size_t " len );
-.BI "int setdomainname(const char *" name ", size_t " len );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR getdomainname (),
-.BR setdomainname ():
-.nf
-    Since glibc 2.21:
-.\"		commit 266865c0e7b79d4196e2cc393693463f03c90bd8
-        _DEFAULT_SOURCE
-    In glibc 2.19 and 2.20:
-        _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
-    Up to and including glibc 2.19:
-        _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
-.fi
-.SH DESCRIPTION
-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's UTS namespace.
-.P
-.BR setdomainname ()
-sets the domain name to the value given in the character array
-.IR name .
-The
-.I len
-argument specifies the number of bytes in
-.IR name .
-(Thus,
-.I name
-does not require a terminating null byte.)
-.P
-.BR getdomainname ()
-returns the null-terminated domain name in the character array
-.IR name ,
-which has a length of
-.I len
-bytes.
-If the null-terminated domain name requires more than \fIlen\fP bytes,
-.BR getdomainname ()
-returns the first \fIlen\fP bytes (glibc) or gives an error (libc).
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.BR setdomainname ()
-can fail with the following errors:
-.TP
-.B EFAULT
-.I name
-pointed outside of user address space.
-.TP
-.B EINVAL
-.I len
-was negative or too large.
-.TP
-.B EPERM
-The caller did not have the
-.B CAP_SYS_ADMIN
-capability in the user namespace associated with its UTS namespace (see
-.BR namespaces (7)).
-.P
-.BR getdomainname ()
-can fail with the following errors:
-.TP
-.B EINVAL
-For
-.BR getdomainname ()
-under libc:
-.I name
-is NULL or
-.I name
-is longer than
-.I len
-bytes.
-.SH VERSIONS
-On most Linux architectures (including x86),
-there is no
-.BR getdomainname ()
-system call; instead, glibc implements
-.BR getdomainname ()
-as a library function that returns a copy of the
-.I domainname
-field returned from a call to
-.BR uname (2).
-.SH STANDARDS
-None.
-.\" But they appear on most systems...
-.SH HISTORY
-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.
-.SH SEE ALSO
-.BR gethostname (2),
-.BR sethostname (2),
-.BR uname (2),
-.BR uts_namespaces (7)