.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
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.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
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.\" 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
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.\" 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.\" manual page may be incorrect or out-of-date.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
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.\" 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
.\"     libc.info (from glibc distribution)
.\" Modified Sat Jul 24 19:12:00 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified Sun Sep  3 20:29:36 1995 by Jim Van Zandt <jrv@vanzandt.mv.com>
.\" Changed network into host byte order (for inet_network),
.\"     Andreas Jaeger <aj@arthur.rhein-neckar.de>, 980130.
.\"
.\" Japanese Version Copyright (c) 1998 Ueyama Rui
.\"         all rights reserved.
.\" Translated 1998-05-23, Ueyama Rui <rui@linux.or.jp>
.\" Updated & Modefied 1999-02-26, Shouichi Saito
.\" Updated 1999-12-26, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2005-10-04, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2007-05-01, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.46
.\"
.\"WORD:	numbers-and-dots notation	ֿͤȥɥåȡ׵ˡ
.\"WORD:	feature test macro	ǽޥ
.\"
.TH INET 3  2007-07-26 "GNU" "Linux Programmer's Manual"
.SH ̾
inet_aton, inet_addr, inet_network, inet_ntoa, inet_makeaddr, inet_lnaof,
inet_netof \- 󥿡ͥåȥɥ쥹롼
.SH 
.nf
.B #include <sys/socket.h>
.B #include <netinet/in.h>
.B #include <arpa/inet.h>
.sp
.BI "int inet_aton(const char *" cp ", struct in_addr *" inp );
.sp
.BI "in_addr_t inet_addr(const char *" cp );
.sp
.BI "in_addr_t inet_network(const char *" cp );
.sp
.BI "char *inet_ntoa(struct in_addr " in );
.sp
.BI "struct in_addr inet_makeaddr(int " net ", int " host );
.sp
.BI "in_addr_t inet_lnaof(struct in_addr " in );
.sp
.BI "in_addr_t inet_netof(struct in_addr " in );
.fi
.sp
.in -4n
glibc εǽޥ׷
.RB ( feature_test_macros (7)
):
.in
.sp
.BR inet_aton (),
.BR inet_ntoa ():
_BSD_SOURCE || _SVID_SOURCE
.SH 
.BR inet_aton ()
ϡ󥿡ͥåȥۥȤΥɥ쥹 \fIcp\fP 
ֿͤȥɥåȡ׵ˡХʥͤѴ롣
̤ \fIinp\fP ؤƤ빽¤Τ롣
֤ͤϡꤷɥ쥹ʤ 0 ʳʤ 0 Ǥ롣
.PP
.BR inet_addr ()
ؿϡ󥿡ͥåȥۥȤΥɥ쥹 \fIcp\fP 
ֿͤȥɥåȡ׵ˡͥåȥХȥǤΥХʥͤ
Ѵ֤ʤ
.B INADDR_NONE
(̤ \-1) ֤롣
δؿľ
.BR inet_aton ()
Фơ\fI٤\fP󥿡եǤ롣ʤʤ \-1 
ɥ쥹 (255.255.255.255) Ǥ롣
.BR inet_aton ()
顼֤뤳Ȥ򤹤äȼȤǤ롣
.PP
.BR inet_network ()
ؿϡ
ֿͤȥɥåȡ׵ˡʸǤ \fIcp\fP 顢
󥿡ͥåȥɥ쥹ȤƻѤǤͤ
ۥȥХȥǼФ
ʤ \-1 ֤롣
.PP
.BR inet_ntoa ()
ؿϡ
ͥåȥХȥǤΥ󥿡ͥåȥۥȥɥ쥹 \fIin\fP
ֿͤȥɥåȡ׵ˡѴ롣ʸ
Ū˳Ƥ줿Хåե֤Τǡ
⤦ 1󤳤δؿƤ֤ʸϾ񤭤롣
.PP
.BR inet_makeaddr ()
ؿϡͥåȥ \fInet\fP ȡ
ΥͥåȥǤΥۥȤΥ륢ɥ쥹 \fIhost\fP 򤯤äĤơ
󥿡ͥåȥۥȤΥɥ쥹롣֤ͤϥͥåȥХȥ
 \fIhost\fP\fInet\fP ϥۥȥХȥǤ롣
.PP
.BR inet_lnaof ()
ؿϡ󥿡ͥåȥɥ쥹 \fIin\fP
Υۥ֤֤ͤϥۥȥХȥǤ롣
.PP
.BR inet_netof ()
ؿϡ󥿡ͥåȥɥ쥹 \fIin\fP
Υͥåȥ֤֤ͤϥۥȥХȥǤ롣
.PP
.BR inet_ntoa (),
.BR inet_makeaddr (),
.BR inet_lnaof (),
.BR inet_netof ()
ǻѤ빽¤ \fIin_addr\fP ϡ
.I <netinet/in.h>
ǼΤ褦Ƥ:
.sp
.in +4n
.nf
typedef uint32_t in_addr_t;

struct in_addr {
    in_addr_t s_addr;
};
.fi
.in
.PP
i386 ǤΥۥȥХȥ LSB first (ȥ륨ǥ) 
󥿡ͥåȤǻȤͥåȥХȥ
MSB first (ӥåǥ) Ǥդ뤳ȡ
.SH 
4.3BSD.
.BR inet_addr (),
.BR inet_aton (),
.BR inet_ntoa ()
 POSIX.1-2001 ǵꤵƤ롣
.SH 
ɥ쥹Фơֿͤȥɥåȡ׵ˡѤ硢
줾οͤƬ 0  8 ʿȲᤵ졢
Ƭ 0x  16 ʿȲᤵդ뤳ȡ
㤨С\fBinet_aton("226.000.000.037", &t)\fP 
\fI226.0.0.37\fP ǤϤʤ \fI226.0.0.31\fP Ȳᤵ롣
.SH Ϣ
.BR gethostbyname (3),
.BR getnetent (3),
.BR inet_ntop (3),
.BR inet_pton (3),
.BR hosts (5),
.BR networks (5)