(split) LDP_man-pages: release ioctl.2 [JM:00378]

[linuxjm/LDP_man-pages.git] / draft / man3 / bindresvport.3

.\" Copyright (C) 2007, Michael Kerrisk <mtk.manpages@gmail.com>
.\" and Copyright (C) 2008, Linux Foundation, written by Michael Kerrisk
.\"     <mtk.manpages@gmail.com>
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" 2007-05-31, mtk: Rewrite and substantial additional text.
.\" 2008-12-03, mtk: Rewrote some pieces and fixed some errors
.\"
.\" Japanese Version Copyright (c) 1999 Shouichi Saito all rights reserved.
.\" Translated 1999-08-28, Shouichi Saito <ss236rx@ymg.urban.ne.jp>
.\" Proofed 1999-09-25, NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\" Updated 2007-06-11, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.54
.\" Updated 2008-12-24, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.15
.\"
.TH BINDRESVPORT 3  2008-12-03 "" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O bindresvport \- bind a socket to a privileged IP port
bindresvport \- ¥½¥±¥Ã¥È¤òÆø¢ IP ¥Ý¡¼¥È¤Ë¥Ð¥¤¥ó¥É¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B #include <sys/types.h>
.B #include <netinet/in.h>
.LP
.BI "int bindresvport(int " sockfd ", struct sockaddr_in *" sin );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.LP
.\"O .BR bindresvport ()
.\"O is used to bind a socket descriptor to a privileged anonymous IP port,
.\"O that is, a port number arbitrarily selected from the range 512 to 1023.
.BR bindresvport ()
¤Ï¡¢¥½¥±¥Ã¥È¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤òÆø¢ÌµÌ¾ (privileged anonymous) IP ¥Ý¡¼¥È¤Ë
¥Ð¥¤¥ó¥É¤¹¤ë¤Î¤Ë»È¤¦¡£Æø¢ÌµÌ¾ IP ¥Ý¡¼¥È¤È¤Ï¡¢
¥Ý¡¼¥ÈÈֹ椬 512 ¤«¤é 1023 ¤ÎÈϰϤ«¤éǤ°Õ¤ËÁªÂò¤µ¤ì¤ë¥Ý¡¼¥È¤Ç¤¢¤ë¡£
.\" Glibc actually starts searching with a port # in the range 600 to 1023

.\"O If the
.\"O .BR bind (2)
.\"O performed by
.\"O .BR bindresvport ()
.\"O is successful, and
.\"O .I sin
.\"O is not NULL, then
.\"O .I sin\->sin_port
.\"O returns the port number actually allocated.
.BR bindresvport ()
¤Ë¤è¤Ã¤Æ¼Â¹Ô¤µ¤ì¤¿
.BR bind (2)
¤¬À®¸ù¤·¡¢
.I sin
¤¬ NULL °Ê³°¤Î¾ì¹ç¡¢¼ÂºÝ¤Ë³ä¤êÅö¤Æ¤é¤ì¤¿¥Ý¡¼¥ÈÈֹ椬
.I sin\->sin_port
¤ËÆþ¤ì¤ÆÊÖ¤µ¤ì¤ë¡£

.\"O .I sin
.\"O can be NULL, in which case
.\"O .I sin\->sin_family
.\"O is implicitly taken to be
.\"O .BR AF_INET .
.\"O However, in this case,
.\"O .BR bindresvport ()
.\"O has no way to return the port number actually allocated.
.\"O (This information can later be obtained using
.\"O .BR getsockname (2).)
.I sin
¤Ë¤Ï NULL ¤ò»ØÄꤹ¤ë¤³¤È¤â¤Ç¤­¡¢¤½¤Î¾ì¹ç¤Ë¤Ï
.I sin\->sin_family
¤Ï°ÅÌۤΤ¦¤Á¤Ë
.B AF_INET
¤È¤ß¤Ê¤µ¤ì¤ë¡£
¤·¤«¤·¡¢¤³¤Î¾ì¹ç¤Ë¤Ï¡¢
.BR bindresvport ()
¤Ï¼ÂºÝ¤Ë³ä¤êÅö¤Æ¤é¤ì¤¿¥Ý¡¼¥ÈÈÖ¹æ¤òÊÖ¤¹¼êÃʤò»ý¤¿¤Ê¤¤
(³ä¤êÅö¤Æ¤é¤ì¤¿¥Ý¡¼¥ÈÈÖ¹æ¤Ï¡¢¸å¤Ç
.BR getsockname (2)
¤ò»È¤Ã¤Æ¼èÆÀ¤Ç¤­¤ë)¡£
.\"O .SH RETURN VALUE
.SH ÊÖ¤êÃÍ
.\"O .BR bindresvport ()
.\"O returns 0 on success; otherwise \-1 is returned and
.\"O .I errno
.\"O set to indicate the cause of the error.
.BR bindresvport ()
¤ÏÀ®¸ù¤¹¤ë¤È 0 ¤òÊÖ¤¹¡£¤½¤ì°Ê³°¤Î¾ì¹ç¡¢\-1 ¤òÊÖ¤·¡¢
.I errno
¤Ë¥¨¥é¡¼¤Î¸¶°ø¤ò¼¨¤¹ÃͤòÀßÄꤹ¤ë¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.\"O .BR bindresvport ()
.\"O can fail for any of the same reasons as
.\"O .BR bind (2).
.BR bindresvport ()
¤Ï
.BR bind (2)
¤ÈƱ¤¸¸¶°ø¤Ç¼ºÇÔ¤¹¤ë²ÄǽÀ­¤¬¤¢¤ë¡£
.\"O In addition, the following errors may occur:
¤µ¤é¤Ë¡¢°Ê²¼¤Î¥¨¥é¡¼¤¬È¯À¸¤¹¤ë¤³¤È¤¬¤¢¤ë:
.TP
.BR EACCES
.\"O The caller did not have superuser privilege (to be precise: the
.\"O .B CAP_NET_BIND_SERVICE
.\"O capability is required).
¸Æ¤Ó½Ð¤·¸µ¤¬¥¹¡¼¥Ñ¡¼¥æ¡¼¥¶¤ÎÆø¢¤ò»ý¤Ã¤Æ¤¤¤Ê¤«¤Ã¤¿ (¤è¤êÀµ³Î¤Ë¸À¤¦¤È¡¢
.B CAP_NET_BIND_SERVICE
¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤¬É¬ÍפǤ¢¤ë)¡£
.TP
.B EADDRINUSE
.\"O All privileged ports are in use.
Á´¤Æ¤ÎÆø¢¥Ý¡¼¥È¤¬»ÈÍÑÃæ¤Ç¤¢¤ë¡£
.TP
.\"O .BR EAFNOSUPPORT " (" EPFNOSUPPORT " in glibc 2.7 and earlier)"
.BR EAFNOSUPPORT " (glibc 2.7 °ÊÁ°¤Ç¤Ï " EPFNOSUPPORT ")"
.\"O .I sin
.\"O is not NULL and
.\"O .I sin->sin_family
.\"O is not
.\"O .BR AF_INET .
.I sin
¤¬ NULL °Ê³°¤Ç¡¢¤«¤Ä
.I sin->sin_family
¤¬
.B AF_INET
¤Ç¤Ê¤«¤Ã¤¿¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O Not in POSIX.1-2001.
.\"O Present on the BSDs, Solaris, and many other systems.
POSIX.1-2001 ¤Ë¤Ï¤Ê¤¤¡£
BSD, Solaris ¤ª¤è¤Ó¤½¤Î¾¤Î¿¤¯¤Î¥·¥¹¥Æ¥à¤Ë¸ºß¤¹¤ë¡£
.\"O .SH NOTES
.SH Ãí°Õ
.LP
.\"O Unlike some
.\"O .BR bindresvport ()
.\"O implementations,
.\"O the glibc implementation ignores any value that the caller supplies in
.\"O .IR sin\->sin_port .
.BR bindresvport ()
¤Î¤¤¤¯¤Ä¤«¤Î¼ÂÁõ¤È°Û¤Ê¤ê¡¢glibc ¤Î¼ÂÁõ¤Ç¤Ï¸Æ¤Ó½Ð¤·¸µ¤¬
.I sin\->sin_port
¤ÇÅϤ·¤¿ÃͤϤɤó¤ÊÃͤǤ¢¤Ã¤Æ¤â̵»ë¤µ¤ì¤ë¡£
.\"O .SH SEE ALSO
.SH ´ØÏ¢¹àÌÜ
.BR bind (2),
.BR getsockname (2)