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.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
.\"
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.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Modified 1997-08-25 by Nicolas Lichtmaier <nick@debian.org>
.\" Modified 2004-06-17 by Michael Kerrisk <mtk.manpages@gmail.com>
.\" Modified 2008-11-27 by mtk
.\"
.\" Japanese Version Copyright (c) 1997 SUTO, Mitsuaki
.\"         all rights reserved.
.\" Translated 1997-06-27, SUTO, Mitsuaki <suto@av.crl.sony.co.jp>
.\" Updated 2000-10-03, Yuichi SATO <sato@complex.eng.hokudai.ac.jp>
.\" Updated & Modified 2004-12-29, Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated 2008-12-26, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.15
.\"
.TH GETDOMAINNAME 2 2009-09-27 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O getdomainname, setdomainname \- get/set domain name
getdomainname, setdomainname \- ¥É¥á¥¤¥ó̾¤Î¼èÆÀ¡¦ÀßÄê¤ò¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.B #include <unistd.h>
.sp
.BI "int getdomainname(char *" name ", size_t " len );
.br
.BI "int setdomainname(const char *" name ", size_t " len );
.sp
.in -4n
.\"O Feature Test Macro Requirements for glibc (see
.\"O .BR feature_test_macros (7)):
glibc ¸þ¤±¤Îµ¡Ç½¸¡ºº¥Þ¥¯¥í¤ÎÍ×·ï
.RB ( feature_test_macros (7)
»²¾È):
.in
.sp
.ad l
.BR getdomainname (),
.BR setdomainname ():
_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE\ <\ 500)
.ad b
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O These functions are used to access or to change the domain name of the
.\"O host system.
¤³¤ì¤é¤Î´Ø¿ô¤Ï¡¢¥Û¥¹¥È¥·¥¹¥Æ¥à¤Î¥É¥á¥¤¥ó̾¤ò¼èÆÀ¡¦Êѹ¹¤¹¤ë¤¿¤á¤Ë»È¤ï¤ì¤ë¡£

.\"O .BR setdomainname ()
.\"O sets the domain name to the value given in the character array
.\"O .IR name .
.\"O The
.\"O .I len
.\"O argument specifies the number of bytes in
.\"O .IR name .
.\"O (Thus,
.\"O .I name
.\"O does not require a terminating null byte.)
.BR setdomainname ()
¤Ï¡¢¥É¥á¥¤¥ó̾¤ò¡¢Ê¸»úÇÛÎó
.I name
¤Ç»ØÄꤵ¤ì¤¿ÃͤËÀßÄꤹ¤ë¡£
°ú¤­¿ô
.I len
¤Ë¤Ï¡¢
.I name
¤Î¥Ð¥¤¥È¿ô¤ò»ØÄꤹ¤ë
(¤½¤Î¤¿¤á¡¢
.I name
¤Ç¤Ïʸ»úÎó½ªÃ¼¤Î NULL ¥Ð¥¤¥È¤ÏɬÍפʤ¤)¡£

.\"O .BR getdomainname ()
.\"O returns the null-terminated domain name in the character array
.\"O .IR name ,
.\"O which has a length of
.\"O .I len
.\"O bytes.
.\"O If the null-terminated domain name requires more than \fIlen\fP bytes,
.\"O .BR getdomainname ()
.\"O returns the first \fIlen\fP bytes (glibc) or gives an error (libc).
.BR getdomainname ()
¤Ï¡¢NULL ½ªÃ¼¤µ¤ì¤¿¥É¥á¥¤¥ó̾¤ò¡¢
.I len
¥Ð¥¤¥È¤ÎŤµ¤Îʸ»úÇÛÎó
.I name
¤Ë³ÊǼ¤·¤ÆÊÖ¤¹¡£
NULL ½ªÃ¼¤µ¤ì¤¿¥É¥á¥¤¥ó̾¤¬ \fIlen\fP ¥Ð¥¤¥È¤è¤êŤ¤¾ì¹ç¡¢
.BR getdomainname ()
¤Ï¡¢(glibc ¤Ç¤Ï) »Ï¤á¤Î \fIlen\fP ¥Ð¥¤¥È¤òÊÖ¤·¡¢(libc ¤Ç¤Ï) ¥¨¥é¡¼¤È¤Ê¤ë¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On success, zero is returned.
.\"O On error, \-1 is returned, and
.\"O .I errno
.\"O is set appropriately.
À®¸ù¤·¤¿¾ì¹ç 0 ¤¬Ê֤롣¼ºÇÔ¤·¤¿¾ì¹ç \-1 ¤¬Ê֤ꡢ
.I errno
¤¬¥¨¥é¡¼¤ÎÆâÍƤ˽¾¤Ã¤ÆÀßÄꤵ¤ì¤ë¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.\"O .BR setdomainname ()
.\"O can fail with the following errors:
.BR setdomainname ()
¤Ï°Ê²¼¤Î¥¨¥é¡¼¤Ç¼ºÇÔ¤¹¤ë²ÄǽÀ­¤¬¤¢¤ë¡£
.TP
.B EFAULT
.\"O .I name
.\"O pointed outside of user address space.
.I name
¤¬¥æ¡¼¥¶¥¢¥É¥ì¥¹¶õ´Ö¤Î³°¤ò»Ø¤·¤¿¡£
.TP
.B EINVAL
.\"O .I len
.\"O was negative or too large.
.I len
¤¬Éé¤Ç¤¢¤ë¤«¡¢Ä¹¤¹¤®¤ë¡£
.TP
.B EPERM
.\"O the caller is unprivileged (Linux: does not have the
.\"O .B CAP_SYS_ADMIN
.\"O capability).
.BR setdomainname ()
¤Ë¤ª¤¤¤Æ¡¢¸Æ¤Ó½Ð¤·¤¿¿Í¤ËÆø¢¤¬¤Ê¤¤
(Linux ¤Ç¤Ï
.B CAP_SYS_ADMIN
¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£ (capability) ¤¬¤Ê¤¤)¡£
.PP
.\"O .BR getdomainname ()
.\"O can fail with the following errors:
.BR getdomainname ()
¤Ï°Ê²¼¤Î¥¨¥é¡¼¤Ç¼ºÇÔ¤¹¤ë²ÄǽÀ­¤¬¤¢¤ë¡£
.TP
.B EINVAL
.\"O For
.\"O .BR getdomainname ()
.\"O under libc:
.\"O .I name
.\"O is NULL or
.\"O .I name
.\"O is longer than
.\"O .I len
.\"O bytes.
libc ¤Ç¤Î
.BR getdomainname ()
¤Ë¤ª¤¤¤Æ¡¢
.I name
¤¬ NULL ¥Ý¥¤¥ó¥¿¤Ç¤¢¤ë¤«¡¢
.I len
¥Ð¥¤¥È¤è¤êŤ¤¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O POSIX does not specify these calls.
.\"O .\" But they appear on most systems...
POSIX ¤Ç¤Ï¡¢¤³¤ì¤é´Ø¿ô¤ÏÄêµÁ¤µ¤ì¤Æ¤¤¤Ê¤¤¡£
.\" ¤·¤«¤·¡¢¤Û¤È¤ó¤É¤Î¥·¥¹¥Æ¥à¤Ë¤¢¤ë...
.\"O .SH NOTES
.SH Ãí°Õ
.\"O Since Linux 1.0, the limit on the length of a domain name,
.\"O including the terminating null byte, is 64 bytes.
.\"O In older kernels, it was 8 bytes.
Linux 1.0 °Ê¹ß¤Ç¤Ï¡¢¥É¥á¥¤¥ó̾¤ÎŤµ¤Î¾å¸Â¤Ï
½ªÃ¼¤Î NULL ¥Ð¥¤¥È¤ò´Þ¤á¤Æ 64 ¥Ð¥¤¥È¤Ç¤¢¤ë¡£
¤â¤Ã¤È¸Å¤¤¥«¡¼¥Í¥ë¤Ç¤Ï 8 ¥Ð¥¤¥È¤Ç¤¢¤Ã¤¿¡£

.\"O On most Linux architectures (including x86),
.\"O there is no
.\"O .BR getdomainname ()
.\"O system call; instead, glibc implements
.\"O .BR getdomainname ()
.\"O as a library function that returns a copy of the
.\"O .I domainname
.\"O field returned from a call to
.\"O .BR uname (2).
(x86 ¤ò´Þ¤à) Linux ¤Î¤Û¤È¤ó¤É¤Î¥¢¡¼¥­¥Æ¥¯¥Á¥ã¤Ç¤Ï¡¢
.BR getdomainname ()
¤È¤¤¤¦¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¸ºß¤·¤Ê¤¤¡£
¤½¤ÎÂå¤ï¤ê¡¢glibc ¤Ç
.BR getdomainname ()
¤¬¥é¥¤¥Ö¥é¥ê´Ø¿ô¤È¤·¤Æ¼ÂÁõ¤µ¤ì¤Æ¤ª¤ê¡¢¤³¤Î´Ø¿ô¤Ï
.BR uname (2)
¤Î¸Æ¤Ó½Ð¤·¤ÇÊÖ¤µ¤ì¤¿
.I domainname
¥Õ¥£¡¼¥ë¥É¤Î¥³¥Ô¡¼¤òÊÖ¤¹¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR gethostname (2),
.BR sethostname (2),
.BR uname (2)