mirror of https://github.com/mkerrisk/man-pages
141 lines
3.9 KiB
Groff
141 lines
3.9 KiB
Groff
.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\" Modified 1997-08-25 by Nicolás Lichtmaier <nick@debian.org>
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.\" Modified 2004-06-17 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Modified 2008-11-27 by mtk
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.\"
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.TH GETDOMAINNAME 2 2019-10-10 "Linux" "Linux Programmer's Manual"
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.SH NAME
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getdomainname, setdomainname \- get/set NIS domain name
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.SH SYNOPSIS
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.B #include <unistd.h>
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.PP
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.BI "int getdomainname(char *" name ", size_t " len );
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.br
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.BI "int setdomainname(const char *" name ", size_t " len );
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.PP
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.RS -4
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.RE
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.PP
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.ad l
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.BR getdomainname (),
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.BR setdomainname ():
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.nf
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Since glibc 2.21:
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.\" commit 266865c0e7b79d4196e2cc393693463f03c90bd8
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_DEFAULT_SOURCE
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In glibc 2.19 and 2.20:
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_DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE\ <\ 500)
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Up to and including glibc 2.19:
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_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE\ <\ 500)
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.fi
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.ad
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.SH DESCRIPTION
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These functions are used to access or to change the NIS domain name of the
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host system.
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More precisely, they operate on the NIS domain name associated with the calling
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process's UTS namespace.
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.PP
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.BR setdomainname ()
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sets the domain name to the value given in the character array
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.IR name .
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The
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.I len
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argument specifies the number of bytes in
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.IR name .
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(Thus,
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.I name
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does not require a terminating null byte.)
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.PP
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.BR getdomainname ()
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returns the null-terminated domain name in the character array
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.IR name ,
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which has a length of
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.I len
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bytes.
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If the null-terminated domain name requires more than \fIlen\fP bytes,
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.BR getdomainname ()
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returns the first \fIlen\fP bytes (glibc) or gives an error (libc).
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.SH RETURN VALUE
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On success, zero is returned.
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On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.BR setdomainname ()
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can fail with the following errors:
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.TP
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.B EFAULT
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.I name
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pointed outside of user address space.
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.TP
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.B EINVAL
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.I len
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was negative or too large.
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.TP
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.B EPERM
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The caller did not have the
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.B CAP_SYS_ADMIN
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capability in the user namespace associated with its UTS namespace (see
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.BR namespaces (7)).
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.PP
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.BR getdomainname ()
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can fail with the following errors:
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.TP
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.B EINVAL
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For
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.BR getdomainname ()
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under libc:
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.I name
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is NULL or
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.I name
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is longer than
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.I len
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bytes.
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.SH CONFORMING TO
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POSIX does not specify these calls.
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.\" But they appear on most systems...
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.SH NOTES
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Since Linux 1.0, the limit on the length of a domain name,
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including the terminating null byte, is 64 bytes.
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In older kernels, it was 8 bytes.
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.PP
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On most Linux architectures (including x86),
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there is no
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.BR getdomainname ()
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system call; instead, glibc implements
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.BR getdomainname ()
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as a library function that returns a copy of the
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.I domainname
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field returned from a call to
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.BR uname (2).
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.SH SEE ALSO
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.BR gethostname (2),
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.BR sethostname (2),
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.BR uname (2),
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.BR uts_namespaces (7)
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