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.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" This manpage is Copyright (C) 2006, Michael Kerrisk
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" Japanese Version Copyright (c) 2006 Yuichi SATO
.\"         all rights reserved.
.\" Translated 2006-10-13 by Yuichi SATO <ysato444@yahoo.co.jp>, LDP v2.39
.\"
.TH FSTATAT 2 2009-12-13 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O fstatat \- get file status relative to a directory file descriptor
fstatat \- ¥Ç¥£¥ì¥¯¥È¥ê¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤«¤éÁêÂÐŪ¤Ê°ÌÃ֤ˤ¢¤ë¥Õ¥¡¥¤¥ë¤Î¾õÂÖ¤ò¼èÆÀ¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.\"O .B #include <fcntl.h>           /* Definition of AT_* constants */
.B #include <fcntl.h>           /* AT_* Äê¿ô¤ÎÄêµÁ */
.B #include <sys/stat.h>
.sp
.BI "int fstatat(int " dirfd ", const char *" pathname ", struct stat *" \
buf ,
.BI "            int " flags );
.fi
.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
.BR fstatat ():
.br
.\"O Since glibc 2.10: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
glibc 2.10 °Ê¹ß: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
.br
.\"O Before glibc 2.10:
glibc 2.10 ¤è¤êÁ°:
_ATFILE_SOURCE
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O The
.\"O .BR fstatat ()
.\"O system call operates in exactly the same way as
.\"O .BR stat (2),
.\"O except for the differences described in this manual page.
.BR fstatat ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¡¢¤³¤Î man ¥Ú¡¼¥¸¤ÇÀâÌÀ¤·¤Æ¤¤¤ë°ã¤¤¤¬¤¢¤ë°Ê³°¤Ï¡¢
.BR stat (2)
¤ÈÁ´¤¯Æ±¤¸¤è¤¦¤ËÆ°ºî¤¹¤ë¡£

.\"O If the pathname given in
.\"O .I pathname
.\"O is relative, then it is interpreted relative to the directory
.\"O referred to by the file descriptor
.\"O .I dirfd
.\"O (rather than relative to the current working directory of
.\"O the calling process, as is done by
.\"O .BR stat (2)
.\"O for a relative pathname).
.I pathname
¤Ç»ØÄꤵ¤ì¤ë¥Ñ¥¹Ì¾¤¬ÁêÂХѥ¹¤Ç¤¢¤ë¾ì¹ç¡¢
¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿
.I dirfd
¤Ç»²¾È¤µ¤ì¤ë¥Ç¥£¥ì¥¯¥È¥ê¤«¤é¤ÎÁêÂХѥ¹Ì¾¤È¤·¤Æ²ò¼á¤µ¤ì¤ë
.RB ( stat (2)
¤Ç¤Ï¡¢ÁêÂХѥ¹¤Ï¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î¥«¥ì¥ó¥È¥ï¡¼¥­¥ó¥°¥Ç¥£¥ì¥¯¥È¥ê¤«¤é¤Î
ÁêÂХѥ¹¤È¤Ê¤ë)¡£

.\"O If
.\"O .I pathname
.\"O is relative and
.\"O .I dirfd
.\"O is the special value
.\"O .BR AT_FDCWD ,
.\"O then
.\"O .I pathname
.\"O is interpreted relative to the current working
.\"O directory of the calling process (like
.\"O .BR stat (2)).
.I pathname
¤¬ÁêÂХѥ¹¤Ç¤¢¤ê¡¢¤«¤Ä
.I dirfd
¤¬ÆÃÊ̤ÊÃÍ
.B AT_FDCWD
¤Ç¤¢¤ë¾ì¹ç¡¢
.I pathname
¤Ï
.RB ( stat (2)
¤ÈƱ¤¸¤è¤¦¤Ë) ¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î
¥«¥ì¥ó¥È¥ï¡¼¥­¥ó¥°¥Ç¥£¥ì¥¯¥È¥ê¤«¤é¤ÎÁêÂХѥ¹Ì¾¤È¤·¤Æ²ò¼á¤µ¤ì¤ë¡£

.\"O If
.\"O .I pathname
.\"O is absolute, then
.\"O .I dirfd
.\"O is ignored.
.I pathname
¤¬ÀäÂХѥ¹¤Ç¤¢¤ë¾ì¹ç¡¢
.I dirfd
¤Ï̵»ë¤µ¤ì¤ë¡£

.\"O .I flags
.\"O can either be 0, or include the following flag:
.I flags
¤Ï 0 ¤Þ¤¿¤Ï°Ê²¼¤Î¥Õ¥é¥°¤Ç¤¢¤ë¡£
.TP
.B AT_SYMLINK_NOFOLLOW
.\"O If
.\"O .I pathname
.\"O is a symbolic link, do not dereference it:
.\"O instead return information about the link itself, like
.\"O .BR lstat (2).
.\"O (By default,
.\"O .BR fstatat ()
.\"O dereferences symbolic links, like
.\"O .BR stat (2).)
.I pathname
¤¬¥·¥ó¥Ü¥ê¥Ã¥¯¥ê¥ó¥¯¤Î¾ì¹ç¤Ï¡¢¤½¤ì¤òé¤ë¤Î¤Ç¤Ï¤Ê¤¯¡¢
.BR lstat (2)
¤ÈƱÍͤ˥ê¥ó¥¯¼«¿È¤Ë¤Ä¤¤¤Æ¤Î¾ðÊó¤òÊÖ¤¹
(¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¡¢
.BR fstatat ()
¤Ï
.BR stat (2)
¤ÈƱÍͤ˥·¥ó¥Ü¥ê¥Ã¥¯¥ê¥ó¥¯¤òé¤ë)¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On success,
.\"O .BR fstatat ()
.\"O returns 0.
À®¸ù¤·¤¿¾ì¹ç¡¢
.BR fstatat ()
¤Ï 0 ¤òÊÖ¤¹¡£
.\"O On error, \-1 is returned and
.\"O .I errno
.\"O is set to indicate the error.
¥¨¥é¡¼¤Î¾ì¹ç¡¢\-1 ¤¬ÊÖ¤µ¤ì¤Æ¡¢
.I errno
¤Ë¤Ï¥¨¥é¡¼¤ò¼¨¤¹Ãͤ¬ÀßÄꤵ¤ì¤ë¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.\"O The same errors that occur for
.\"O .BR stat (2)
.\"O can also occur for
.\"O .BR fstatat ().
.BR stat (2)
¤ÈƱ¤¸¥¨¥é¡¼¤¬
.BR fstatat ()
¤Ç¤âµ¯¤³¤ë¡£
.\"O The following additional errors can occur for
.\"O .BR fstatat ():
.BR fstatat ()
¤Ç¤Ï¡¢¤½¤Î¾¤Ë°Ê²¼¤Î¥¨¥é¡¼¤¬µ¯¤³¤ë:
.TP
.B EBADF
.\"O .I dirfd
.\"O is not a valid file descriptor.
.I dirfd
¤¬Í­¸ú¤Ê¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ç¤Ê¤¤¡£
.TP
.B EINVAL
.\"O Invalid flag specified in
.\"O .IR flags .
.I flags
¤ËÉÔÀµ¤Ê¥Õ¥é¥°Ãͤ¬»ØÄꤵ¤ì¤¿¡£
.TP
.B ENOTDIR
.\"O .I pathname
.\"O is relative and
.\"O .I dirfd
.\"O is a file descriptor referring to a file other than a directory.
.I pathname
¤¬ÁêÂХѥ¹¤Ç¡¢¤«¤Ä
.I dirfd
¤¬¥Ç¥£¥ì¥¯¥È¥ê°Ê³°¤Î¥Õ¥¡¥¤¥ë¤ò»²¾È¤¹¤ë¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ç¤¢¤ë¡£
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O .BR fstatat ()
.\"O was added to Linux in kernel 2.6.16.
.BR fstatat ()
¤Ï Linux ¥«¡¼¥Í¥ë 2.6.16 ¤ÇÄɲ䵤줿¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
POSIX.1-2008.
.\"O A similar system call exists on Solaris.
Solaris ¤Ë¤Ï¡¢¤³¤ì¤ÈƱ¤¸¤è¤¦¤Ê¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬Â¸ºß¤¹¤ë¡£
.\"O .SH NOTES
.SH Ãí°Õ
.\"O See
.\"O .BR openat (2)
.\"O for an explanation of the need for
.\"O .BR fstatat ().
.BR fstatat ()
¤¬É¬ÍפÊÍýͳ¤Ë¤Ä¤¤¤Æ¤Ï¡¢
.BR openat (2)
¤ò»²¾È¤¹¤ë¤³¤È¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR openat (2),
.BR stat (2),
.BR path_resolution (7),
.BR symlink (7),