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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man3 / resolver.3

.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified 1993-07-25 by Rik Faith (faith@cs.unc.edu)
.\" Modified 2004-10-31 by aeb
.\"
.\" Japanese Version Copyright (c) 1998 Shinji Orito all rights reserved.
.\"     Translated Mon May 25 21:27:03 JST 1998
.\"             by Shinji Orito <shinji@os.gulf.or.jp>
.\" Updated & Modified Thu Feb 17 03:58:45 JST 2005
.\"         by Yuichi SATO <ysato444@yahoo.co.jp>
.\"
.\"WORD:        resolver        ¥ì¥¾¥ë¥Ð (¥ê¥¾¥ë¥Ð)
.\"WORD:        override        ¥ª¡¼¥Ð¡¼¥é¥¤¥É
.\"WORD:        call    ¸Æ¤Ó½Ð¤·¡¢¸Æ¤Ó½Ð¤¹
.\"WORD:        fully qualified domain name     ´°Á´½¤¾þ¥É¥á¥¤¥ó̾(FQDN)
.\"WORD:        type    ·¿
.\"WORD:        class   ¥¯¥é¥¹
.\"WORD:        query   Ì䤤¹ç¤ï¤»¡¢Ì䤤¹ç¤ï¤»¤ë
.\"WORD:        buffer  ¥Ð¥Ã¥Õ¥¡¡¼
.\"WORD:        lower-level routines    ²¼°Ì¥ë¡¼¥Á¥ó
.\"WORD:        limit of the array      ÇÛÎó¤ÎÈÏ°Ï
.\"WORD:        state information       ¾õÂ֤ξðÊó
.\"WORD:        bitwise ``or''  ¥Ó¥Ã¥Èñ°Ì¤ÎÏÀÍýÏÂ
.\"WORD:        True    ¿¿ÃÍ
.\"WORD:        authoritative   ¸¢°ÒÉÕ¤±¤µ¤ì¤¿
.\"WORD:        recursion desired bit   ºÆµ¢Í×µá¥Ó¥Ã¥È
.\"WORD:        single component names  °ìÉôʬ¤«¤é¤Ê¤ë̾Á°
.\"
.TH RESOLVER 3 2008-11-07 "GNU" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O res_init, res_query, res_search, res_querydomain, res_mkquery, res_send,
.\"O dn_comp, dn_expand \- resolver routines
res_init, res_query, res_search, res_querydomain, res_mkquery, res_send, dn_comp, dn_expand \- ¥ì¥¾¥ë¥Ð¡¦¥ë¡¼¥Á¥ó
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B #include <netinet/in.h>
.B #include <arpa/nameser.h>
.B #include <resolv.h>
.B extern struct state _res;
.sp
.B int res_init(void);
.sp
.BI "int res_query(const char *" dname ", int " class ", int " type ,
.RS
.BI "unsigned char *" answer ", int " anslen );
.RE
.sp
.BI "int res_search(const char *" dname ", int " class ", int " type ,
.RS
.BI "unsigned char *" answer ", int " anslen );
.RE
.sp
.BI "int res_querydomain(const char *" name ", const char *" domain ,
.RS
.BI "int " class ", int " type ", unsigned char *" answer ,
.BI "int " anslen );
.RE
.sp
.BI "int res_mkquery(int " op ", const char *" dname ", int " class ,
.RS
.BI "int " type ", char *" data ", int " datalen ", struct rrec *" newrr ,
.BI "char *" buf ", int " buflen );
.RE
.sp
.BI "int res_send(const char *" msg ", int " msglen ", char *" answer ,
.RS
.BI "int " anslen );
.RE
.sp
.BI "int dn_comp(unsigned char *" exp_dn ", unsigned char *" comp_dn ,
.RS
.BI "int " length ", unsigned char **" dnptrs ", unsigned char *" exp_dn ,
.BI "unsigned char **" lastdnptr );
.RE
.sp
.BI "int dn_expand(unsigned char *" msg ", unsigned char *" eomorig ,
.RS
.BI "unsigned char *" comp_dn ", char *" exp_dn ,
.BI "int " length );
.RE
.fi
.sp
.\"O Link with \fI\-lresolv\fP.
\fI\-lresolv\fP ¤Ç¥ê¥ó¥¯¤¹¤ë¡£
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O These functions make queries to and interpret the responses from Internet
.\"O domain name servers.
¤³¤ì¤é¤Î´Ø¿ô¤Ï¥¤¥ó¥¿¡¼¥Í¥Ã¥È¤Î¥É¥á¥¤¥ó¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤ËÌ䤤¹ç¤ï¤»¡¢
¤½¤Î±þÅú¤ò²ò¼á¤¹¤ë¡£
.PP
.\"O The
.\"O .BR res_init ()
.\"O function reads the configuration files (see
.\"O resolv.conf(5)) to get the default domain name, search order and name
.\"O server address(es).
.\"O If no server is given, the local host is tried.
.BR res_init ()
´Ø¿ô¤Ï¡¢¥Ç¥Õ¥©¥ë¥È¤Î¥É¥á¥¤¥ó̾¡¢¸¡º÷½ç¡¢¥Í¡¼¥à¥µ¡¼¥Ð¡¼
¥¢¥É¥ì¥¹¤òÆÀ¤ë¤¿¤á¤ËÀßÄê¥Õ¥¡¥¤¥ë (resolv.conf(5) »²¾È) ¤òÆɤࡣ
¤â¤·¥µ¡¼¥Ð¡¼¤¬¼¨¤µ¤ì¤Æ¤¤¤Ê¤±¤ì¤Ð¥í¡¼¥«¥ë¥Û¥¹¥È¤ò»î¤¹¡£
.\"O If no domain is given, that associated with the local host is used.
.\"O It can be overridden with the environment variable
.\"O .BR LOCALDOMAIN .
.\"O .BR res_init ()
.\"O is normally executed by the first call to one of the
.\"O other functions.
¥É¥á¥¤¥ó¤¬¼¨¤µ¤ì¤Æ¤¤¤Ê¤±¤ì¤Ð¥í¡¼¥«¥ë¥Û¥¹¥È¤ËÉÕ¤±¤é¤ì¤¿¥É¥á¥¤¥ó¤òÍѤ¤¤ë¡£
´Ä¶­ÊÑ¿ô
.B LOCALDOMAIN
¤Ç¥ª¡¼¥Ð¡¼¥é¥¤¥É¤Ç¤­¤ë¡£
.BR res_init ()
¤Ï¡¢¸å½Ò¤¹¤ë´Ø¿ô¤Î¤É¤ì¤«¤¬ºÇ½é¤Ë¸Æ¤Ó½Ð¤µ¤ì¤¿»þ¡¢¤½¤Î´Ø¿ô
¤«¤é¼Â¹Ô¤µ¤ì¤ë¡£
.PP
.\"O The
.\"O .BR res_query ()
.\"O function queries the name server for the
.\"O fully qualified domain name \fIname\fP of specified \fItype\fP and
.\"O \fIclass\fP.
.\"O The reply is left in the buffer \fIanswer\fP of length
.\"O \fIanslen\fP supplied by the caller.
.BR res_query ()
´Ø¿ô¤Ï¡¢»ØÄꤵ¤ì¤¿ \fItype\fP ¤È \fIclass\fP ¤Î
´°Á´½¤¾þ¥É¥á¥¤¥ó̾ (FQDN) \fIname\fP ¤ò¡¢¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤ØÌ䤤¹ç¤ï¤»¤ë¡£
±þÅú¤Ï¡¢¸Æ¤Ó½Ð¤·¤¿Â¦¤Ë¤è¤Ã¤ÆÍÑ°Õ¤µ¤ì¤ëŤµ \fIanslen\fP ¤Î \fIanswer\fP
¥Ð¥Ã¥Õ¥¡¡¼¤Ë»Ä¤µ¤ì¤ë¡£
.PP
.\"O The
.\"O .BR res_search ()
.\"O function makes a query and waits for the response
.\"O like
.\"O .BR res_query (),
.\"O but in addition implements the default and search
.\"O rules controlled by
.\"O .B RES_DEFNAMES
.\"O and
.\"O .B RES_DNSRCH
.\"O (see description of
.\"O \fI_res\fP options below).
.BR res_search ()
´Ø¿ô¤Ï¡¢Ì䤤¹ç¤ï¤»¤ò¹Ô¤¤
.BR res_query ()
ƱÍͤ½¤Î±þÅú¤ò
ÂԤĤ¬¡¢¤µ¤é¤Ë¥Ç¥Õ¥©¥ë¥È¤ò¼ÂÁõ¤·¤Æ¤ª¤ê
.B RES_DEFNAMES
¤È
.B RES_DNSRCH
¤Ë¤è¤Ã¤Æµ¬Äꤵ¤ì¤ë¸¡º÷¥ë¡¼¥ë¤òŬÍѤ¹¤ë¡£
(²¼µ­ \fI_res\fP ¥ª¥×¥·¥ç¥ó¤ÎÀâÌÀ¤ò»²¾È)
.PP
.\"O The \fBres_querydomain\fP() function makes a query using
.\"O .BR res_query ()
.\"O on the concatenation of \fIname\fP and \fIdomain\fP.
.BR res_querydomain ()
´Ø¿ô¤Ï \fIname\fP ¤È \fIdomain\fP ¤Î·ë¹ç¤Ë
.BR res_query ()
¤òÍѤ¤¤ÆÌ䤤¹ç¤ï¤»¤ò¹Ô¤¦¡£
.PP
.\"O The following functions are lower-level routines used by
.\"O .BR res_query ().
¼¡¤Î´Ø¿ô¤Ï¡¢
.BR res_query ()
¤Ç»È¤ï¤ì¤ë²¼°Ì¥ë¡¼¥Á¥ó¤Ç¤¢¤ë¡£
.PP
.\"O The
.\"O .BR res_mkquery ()
.\"O function constructs a query message in \fIbuf\fP
.\"O of length \fIbuflen\fP for the domain name \fIdname\fP.
.\"O The query type
.\"O \fIop\fP is usually
.\"O .BR QUERY ,
.\"O but can be any of the types defined in
.\"O \fI<arpa/nameser.h>\fP.  \fInewrr\fP is currently unused.
.BR res_mkquery ()
´Ø¿ô¤Ï¡¢¥É¥á¥¤¥ó̾ \fIdname\fP ¤Î°Ù¤Ë¡¢Ä¹¤µ \fIbuflen\fP
¤Î \fIbuf\fP ¤ËÌ䤤¹ç¤ï¤»¤ë¥á¥Ã¥»¡¼¥¸¤òºîÀ®¤¹¤ë¡£
Ì䤤¹ç¤ï¤»¤Î·¿ \fIop\fP ¤ÏÄ̾ï
.B QUERY
¤À¤¬¡¢ \fI<arpa/nameser.h>\fP ¤ÇÄêµÁ¤µ¤ì¤¿·¿¤Î¤É¤ì¤Ç¤âÎɤ¤¡£
\fInewrr\fP ¤Ï¸½ºß»ÈÍѤµ¤ì¤Æ¤¤¤Ê¤¤¡£
.PP
.\"O The
.\"O .BR res_send ()
.\"O function sends a preformatted query given in
.\"O \fImsg\fP of length \fImsglen\fP and returns the answer in \fIanswer\fP
.\"O which is of length \fIanslen\fP.
.\"O It will call
.\"O .BR res_init (),
.\"O if it
.\"O has not already been called.
.BR res_send ()
´Ø¿ô¤Ï¡¢Ä¹¤µ \fImsglen\fP ¤Î \fImsg\fP ¤Ë·è¤á¤é¤ì¤¿½ñ¼°
¤ÇÌ䤤¹ç¤ï¤»¡¢\fIanswer\fP ¤ËŤµ \fIanslen\fP ¤Î²óÅú¤òÊÖ¤¹¡£
¤Þ¤À¸Æ¤Ó½Ð¤µ¤ì¤Æ¤¤¤Ê¤±¤ì¤Ð
.BR res_init ()
¤ò¸Æ¤Ó½Ð¤¹¡£
.PP
.\"O The
.\"O .BR dn_comp ()
.\"O function compresses the domain name \fIexp_dn\fP
.\"O and stores it in the buffer \fIcomp_dn\fP of length \fIlength\fP.
.\"O The compression uses an array of pointers \fIdnptrs\fP to previously
.\"O compressed names in the current message.
.\"O The first pointer points
.\"O to the beginning of the message and the list ends with NULL.
.\"O The limit of the array is specified by \fIlastdnptr\fP.
.\"O If \fIdnptr\fP is NULL, domain names are not compressed.
.\"O If \fIlastdnptr\fP is NULL, the list
.\"O of labels is not updated.
.BR dn_comp ()
´Ø¿ô¤Ï¥É¥á¥¤¥ó̾ \fIexp_dn\fP ¤ò°µ½Ì¤·¤Æ¡¢Ä¹¤µ \fIlength\fP
¤Î¥Ð¥Ã¥Õ¥¡¡¼ \fIcomp_dn\fP ¤ËÊݸ¤¹¤ë¡£
°µ½Ì¤Ë¤Ï¥Ý¥¤¥ó¥¿¡¼ÇÛÎó \fIdnptrs\fP ¤òÍѤ¤¤ë¡£
¤³¤ì¤é¤Î¥Ý¥¤¥ó¥¿¡¼¤Ï¡¢¸½ºß¤Î¥á¥Ã¥»¡¼¥¸¤ÎÃæ¤Ë¤¢¤ë°ÊÁ°¤Ë°µ½Ì¤µ¤ì¤¿Ì¾Á°¤ò»Ø¤¹¡£
ºÇ½é¤Î¥Ý¥¤¥ó¥¿¡¼¤Ï¥á¥Ã¥»¡¼¥¸¤ÎËÁƬ¤ò»Ø¤·¡¢¤½¤Î¥ê¥¹¥È¤Ï NULL ¤Ç½ª¤ï¤ë¡£
ÇÛÎó¤ÎÈÏ°Ï¤Ï \fIlastdnptr\fP ¤Ç·è¤á¤é¤ì¤ë¡£
\fIdnptr\fP ¤¬ NULL ¤Ê¤é¤Ð¥É¥á¥¤¥ó̾¤Ï°µ½Ì¤µ¤ì¤Ê¤¤¡£
\fIlastdnptr\fP ¤¬ NULL ¤Ê¤é¤Ð¡¢¤½¤Î¥é¥Ù¥ë¤Î¥ê¥¹¥È¤Ï¥¢¥Ã¥×¥Ç¡¼¥È¤µ¤ì¤Ê¤¤¡£
.PP
.\"O The
.\"O .BR dn_expand ()
.\"O function expands the compressed domain name
.\"O \fIcomp_dn\fP to a full domain name, which is placed in the buffer
.\"O \fIexp_dn\fP of size \fIlength\fP.
.\"O The compressed name is contained
.\"O in a query or reply message, and \fImsg\fP points to the beginning of
.\"O the message.
.BR dn_expand ()
´Ø¿ô¤Ï¡¢°µ½Ì¤µ¤ì¤¿¥É¥á¥¤¥ó̾ \fIcomp_dn\fP ¤«¤é¥µ¥¤¥º
¤¬ \fIlength\fP ¤Î \fIexp_dn\fP ¥Ð¥Ã¥Õ¥¡¡¼¤ËÀµ¼°¤Ê¥É¥á¥¤¥ó̾¤òŸ³«¤¹¤ë¡£
¤½¤Î°µ½Ì¤µ¤ì¤¿Ì¾Á°¤Ï¡¢Ì䤤¹ç¤ï¤»¡¢¤Þ¤¿¤Ï±þÅú¥á¥Ã¥»¡¼¥¸¤Ë´Þ¤Þ¤ì¤Æ¤¤¤Æ¡¢
\fImsg\fP ¤¬¥á¥Ã¥»¡¼¥¸¤ÎËÁƬ¤ò»Ø¤¹¡£
.PP
.\"O The resolver routines use global configuration and state information
.\"O contained in the structure \fI_res\fP, which is defined in
.\"O \fI<resolv.h>\fP.
.\"O The only field that is normally manipulated by the
.\"O user is \fI_res.options\fP.
.\"O This field can contain the bitwise "OR"
.\"O of the following options:
¥ì¥¾¥ë¥Ð¡¦¥ë¡¼¥Á¥ó¤Ï¡¢\fI<resolv.h>\fP ¤ËÄêµÁ¤µ¤ì¤¿ \fI_res\fP ¹½Â¤ÂΤË
´Þ¤Þ¤ì¤Æ¤¤¤ëÁ´ÂÎŪ¤ÊÀßÄê¤È¾õÂ֤ξðÊó¤ò»ÈÍѤ¹¤ë¡£
Ä̾ï¥æ¡¼¥¶¡¼¤ËÁàºî¤Ç¤­¤ë¹àÌÜ¤Ï \fI_res.options\fP ¤À¤±¤Ç¤¢¤ë¡£
¤³¤Î¹àÌܤϰʲ¼¤Î¥ª¥×¥·¥ç¥ó¤Î¥Ó¥Ã¥Èñ°Ì¤ÎÏÀÍýϤˤǤ­¤ë¡£
.TP
.B RES_INIT
.\"O True if
.\"O .BR res_init ()
.\"O has been called.
.BR res_init ()
¤¬¸Æ¤Ó½Ð¤µ¤ì¤Æ¤¤¤ì¤Ð¿¿¡£
.TP
.B RES_DEBUG
.\"O Print debugging messages.
¥Ç¥Ð¥Ã¥°¡¦¥á¥Ã¥»¡¼¥¸¤ò½ÐÎϤ¹¤ë¡£
.TP
.B RES_AAONLY
.\"O Accept authoritative answers only.
.\"O .BR res_send ()
.\"O continues until
.\"O it fins an authoritative answer or returns an error.  [Not currently
.\"O implemented].
¸¢°ÒÉÕ¤±¤µ¤ì¤¿ (authoritative) ²óÅú¤Î¤ß¼õ¤±Æþ¤ì¤ë¡£
.BR res_send ()
¤Ï¡¢ºÇ½ªÅª¤Ë¸¢°ÒÉÕ¤±¤µ¤ì¤¿²óÅú¤òÆÀ¤é¤ì¤ë¤«¡¢¥¨¥é¡¼¤¬ÊÖ¤µ¤ì¤ë
¤Þ¤Ç³¹Ô¤¹¤ë¡£
[¸½ºß¼ÂÁõ¤µ¤ì¤Æ¤¤¤Ê¤¤]
.TP
.B RES_USEVC
.\"O Use TCP connections for queries rather than UDP datagrams.
Ì䤤¹ç¤ï¤»¤Ë UDP ¥Ç¡¼¥¿¥°¥é¥à¤Ç¤Ï¤Ê¤¯ TCP Àܳ¤òÍѤ¤¤ë¡£
.TP
.B RES_PRIMARY
.\"O Query primary domain name server only.
¥×¥é¥¤¥Þ¥ê¡¦¥É¥á¥¤¥ó¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤Î¤ßÌ䤤¹ç¤ï¤»¤ë¡£
.TP
.B RES_IGNTC
.\"O Ignore truncation errors.
.\"O Don't retry with TCP.  [Not currently
.\"O implemented].
ÀÚ¤êµÍ¤á¥¨¥é¡¼ (truncation error) ¤ò̵»ë¤¹¤ë¡£TCP ¤Ç¥ê¥È¥é¥¤¤·¤Ê¤¤¡£
[¸½ºß¼ÂÁõ¤µ¤ì¤Æ¤¤¤Ê¤¤]
.TP
.B RES_RECURSE
.\"O Set the recursion desired bit in queries.
.\"O Recursion is carried out
.\"O by the domain name server, not by
.\"O .BR res_send ().
.\"O [Enabled by default].
.\"Osato:
.\"Osato: recursion desired ¤Ï¡ÖºÆµ¢Í×µá¡×¡ÖºÆµ¢Í×˾¡×¡ÖºÆµ¢Í×ÀÁ¡×¤Ê¤É¤È
.\"Osato: Ìõ¤µ¤ì¤Æ¤¤¤ë¤â¤Î¤¬¤¢¤ê¤Þ¤·¤¿¡£
.\"Osato:
ºÆµ¢Í×µá (recursion desired) ¥Ó¥Ã¥È¤òÌ䤤¹ç¤ï¤»¤ËÀßÄꤹ¤ë¡£
ºÆµ¢¤Ï
.BR res_send ()
¤Ç¤Ï¤Ê¤¯¥É¥á¥¤¥ó¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤Ë¤è¤Ã¤Æ¹Ô¤ï¤ì¤ë¡£
[¥Ç¥Õ¥©¥ë¥È¤ÇÍ­¸ú]
.TP
.B RES_DEFNAMES
.\"O If set,
.\"O .BR res_search ()
.\"O will append the default domain name to
.\"O single component names, i.e., those that do not contain a dot.
.\"O [Enabled by default].
.\"Osato:
.\"Osato: single component ¤Ï¡Ö1 ¤Ä¤ÎÍ×ÁǤ«¤é¤Ê¤ë¡×¤ÎÊý¤¬¤è¤¤¤Ç¤·¤ç¤¦¤«?
.\"Osato:
ÀßÄꤵ¤ì¤Æ¤¤¤ì¤Ð¡¢
.BR res_search ()
¤Ï¥Ç¥Õ¥©¥ë¥È¤Î¥É¥á¥¤¥ó̾¤ò°ìÉôʬ
¤Î¤ß¤«¤é¤Ê¤ë̾Á°¡¢¤¹¤Ê¤ï¤Á¥É¥Ã¥È¤ò´Þ¤Þ¤Ê¤¤Ì¾Á°¤ËÉÕ¤±²Ã¤¨¤ë¡£
[¥Ç¥Õ¥©¥ë¥È¤ÇÍ­¸ú]
.TP
.B RES_STAYOPEN
.\"O Used with
.\"O .B RES_USEVC
.\"O to keep the TCP connection open between queries.
Ì䤤¹ç¤ï¤»Ãæ¤Ë TCP Àܳ¤òÊݤĤ¿¤á
.B RES_USEVC
¤È¶¦¤ËÍѤ¤¤é¤ì¤ë¡£
.TP
.B RES_DNSRCH
.\"O If set,
.\"O .BR res_search ()
.\"O will search for hostnames in the current
.\"O domain and in parent domains.
.\"O This option is used by
.\"O .BR gethostbyname (3).
.\"O [Enabled by default].
ÀßÄꤵ¤ì¤Æ¤¤¤ì¤Ð¡¢
.BR res_search ()
¤Ï¸½ºß¤Î¥É¥á¥¤¥ó¤ª¤è¤Ó¿Æ¥É¥á¥¤¥ó¤Î
¥Û¥¹¥È̾¤òõ¤¹¡£¤³¤Î¥ª¥×¥·¥ç¥ó¤Ï
.BR gethostbyname (3)
¤ÇÍѤ¤¤é¤ì¤ë¡£
[¥Ç¥Õ¥©¥ë¥È¤ÇÍ­¸ú]
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O The
.\"O .BR res_init ()
.\"O function returns 0 on success, or \-1 if an error
.\"O occurs.
.BR res_init ()
´Ø¿ô¤ÏÀ®¸ù¤¹¤ì¤Ð 0 ¤ò¡¢¥¨¥é¡¼¤¬È¯À¸¤¹¤ì¤Ð \-1 ¤òÊÖ¤¹¡£
.PP
.\"O The \fBres_query\fP(), \fBres_search\fP(),
.\"O .BR res_querydomain (),
.\"O .BR res_mkquery ()
.\"O and
.\"O .BR res_send ()
.\"O functions return the length
.\"O of the response, or \-1 if an error occurs.
.BR res_query (),
.BR res_search (),
.BR res_querydomain (),
.BR res_mkquery (),
.BR res_send ()
´Ø¿ô¤Ï±þÅú¤ÎŤµ¤òÊÖ¤¹¡£
¤Þ¤¿¡¢¥¨¥é¡¼¤¬È¯À¸¤¹¤ì¤Ð \-1 ¤òÊÖ¤¹¡£
.PP
.\"O The
.\"O .BR dn_comp ()
.\"O and
.\"O .BR dn_expand ()
.\"O functions return the length
.\"O of the compressed name, or \-1 if an error occurs.
.BR dn_comp ()
¤È
.BR dn_expand ()
´Ø¿ô¤Ï°µ½Ì¤µ¤ì¤¿¥É¥á¥¤¥ó̾¤ÎŤµ¤òÊÖ¤¹¡£
¤Þ¤¿¡¢¥¨¥é¡¼¤¬È¯À¸¤¹¤ì¤Ð \-1 ¤òÊÖ¤¹¡£
.\"O .SH FILES
.SH ¥Õ¥¡¥¤¥ë
.nf
.\"O /etc/resolv.conf          resolver configuration file
/etc/resolv.conf          ¥ì¥¾¥ë¥ÐÀßÄê¥Õ¥¡¥¤¥ë
.\"O /etc/host.conf            resolver configuration file
/etc/host.conf            ¥ì¥¾¥ë¥ÐÀßÄê¥Õ¥¡¥¤¥ë
.fi
.\"O .SH "CONFORMING TO"
.SH ½àµò
4.3BSD.
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR gethostbyname (3),
.BR resolv.conf (5),
.BR resolver (5),
.BR hostname (7),
.BR named (8)