.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" Modified by Michael Haardt <michael@moria.de>
.\" Modified 1993-07-21 by Rik Faith <faith@cs.unc.edu>
.\" Modified 1997-01-12 by Michael Haardt
.\"   <michael@cantor.informatik.rwth-aachen.de>: NFS details
.\" Modified 2004-06-23 by Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" Japanese Version Copyright (c) 1996 Yosiaki Yanagihara
.\"         all rights reserved.
.\" Translated 1996-06-24, Yosiaki Yanagihara <yosiaki@bsd2.kbnes.nec.co.jp>
.\" Modified 1998-05-11, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated & Modified 2001-06-25, Yuichi SATO <ysato@h4.dion.ne.jp>
.\" Updated & Modified 2004-12-29, Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated 2008-08-09, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.05
.\"
.TH CHMOD 2 2008-05-26 "Linux" "Linux Programmer's Manual"
.SH ̾
chmod, fchmod \- եΥ⡼ɤѹ
.SH 
.B #include <sys/stat.h>
.sp
.BI "int chmod(const char *" path ", mode_t " mode );
.br
.BI "int fchmod(int " fd ", mode_t " mode );
.sp
.in -4n
glibc εǽޥ׷
.RB ( feature_test_macros (7)
):
.in
.sp
.BR fchmod ():
_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
.SH 
ΥƥॳϥեΥ (permission) ѹ롣
ƥॳ֤ΰ㤤ϡեλλǤ롣
.IP * 2
.BR chmod ()
ϡ
.I path
ǻꤵ줿ѥ̾ĥեεĤѹ롣
.I path
ܥå󥯤ξϡ󥯤ŸԤ롣
.IP *
.BR fchmod ()
ϡץ󤵤줿եǥץ
.I fd
ˤ껲ȤեεĤѹ롣
.PP
եĤ
.I mode
ǻꤵ롣
.I mode
ϡʲ˼ͤ 0 İʾ OR () Ȥäƺ
ӥåȥޥǤ롣
.TP 18
.BR S_ISUID "  (04000)"
set-user-ID
.RB ( execve (2)
˥ץμ¸桼 ID ˥åȤ)
.TP
.BR S_ISGID "  (02000)"
set-group-ID
(ʲξ
.RB ( execve (2)
¹Ի˥ץμ¸롼 ID ˥åȤ롢
å (mandatory locking) Ԥ
.RB ( fcntl (2)
򻲾)
եΥ롼פȤƿƥǥ쥯ȥƱΤȤ
.RB ( chown (2)

.BR ( mkdir (2)
򻲾)
.TP
.BR S_ISVTX "  (01000)"
ƥåӥå (sticky bit) (¥ե饰
.BR unlink (2)
򻲾)
.TP
.BR S_IRUSR "  (00400)"
ͭԤˤɤ߼
.TP
.BR S_IWUSR "  (00200)"
ͭԤˤ񤭹
.TP
.BR S_IXUSR "  (00100)"
ͭԤˤ¹ (execute) /  (search)
(ָפϥǥ쥯ȥФŬѤΤǡ
Υǥ쥯ȥΥȥ꡼إǤ뤫̣)
.TP
.BR S_IRGRP "  (00040)"
롼פˤɤ߼
.TP
.BR S_IWGRP "  (00020)"
롼פˤ񤭹
.TP
.BR S_IXGRP "  (00010)"
롼פˤ¹ / 
.TP
.BR S_IROTH "  (00004)"
¾ (others) ˤɤ߼
.TP
.BR S_IWOTH "  (00002)"
¾ͤˤ񤭹
.TP
.BR S_IXOTH "  (00001)"
¾ͤˤ¹ / 
.PP
ƤӽФץμ¸ (effective) UID եνͭԤȰפ뤫
ΥץøʤФʤʤ
(Linux Ǥ
.B CAP_FOWNER
ѥӥƥ (capability) ʤФʤʤ)

ƤӽФץøʤ (Linux Ǥ
.B CAP_FSETID
ѥӥƥʤ)ĥեΥ롼 ID 
ץμ¸롼 ID ޤŪʥ롼 ID ˥ޥåʤ硢
.B S_ISGID
ӥåȤϥդˤ뤬ˤäƥ顼֤뤳ȤϤʤ

Τν֤Ȥơ
ե롦ƥˤäƤϡեν񤭹ߤԤ
åȡ桼 ID ȥåȡ롼 ID ӥåȤȼ¹ԥӥåȤ
դˤ뤳Ȥ롣
(Linux Ǥϡ񤭹ߥץ
.B CAP_FSETID
ѥӥƥäƤʤˡ줬롣)
ե롦ƥˤϡѡ桼
̤ΰ̣ĥƥåӥåȤǤΤ롣
ƥåӥåȤȥǥ쥯ȥФ
åȡ桼 (롼)ID ӥåȤˤĤƤϡ
.BR stat (2)
򸫤衣

NFS ե륷ƥǤϡѡߥå¤ȡ
˥ץ󤵤ƤեФƤ˱ƶڤ֡
ϥ椬СǹԤƤ뤬
ץ󤵤Ƥեϥ饤¦ǴƤ뤿Ǥ롣
饤¦ǥե°Υå夬ͭˤʤäƤˡ
ѡߥå¤ˤȡ
¾Υ饤Ȥ˾Τ٤뤫⤷ʤ
.SH ֤
ȡ0 ֤Ԥȡ\-1֤
.I errno
Ŭڤͤꤹ롣
.SH 顼
ե롦ƥˤäƤ¾Υ顼֤礬롣
.BR chmod ()
ǰŪʥ顼ʲ˵󤲤롣
.TP
.B EACCES
ѥ̾ιǤ˸Ĥʤ
.RB ( path_resolution (7)
⸫)
.TP
.B EFAULT
.I path
Ƥ줿ɥ쥹ֳؤƤ롣
.TP
.B EIO
I/O 顼ȯ
.TP
.B ELOOP
.I path
褹ݤܥå󥯤¿᤮롣
.TP
.B ENAMETOOLONG
.I path
Ĺ᤮롣
.TP
.B ENOENT
ե뤬¸ߤʤ
.TP
.B ENOMEM
ͥ˽ʬʥ꤬ʤ
.TP
.B ENOTDIR
ѥ̾ιǤǥ쥯ȥǤϤʤ
.TP
.B EPERM
¸ UID եνͭԤȰפץøʤ
(Linux Ǥ
.B CAP_FOWNER
ѥӥƥʤ)
.TP
.B EROFS
ե뤬ɤ߹ (read only) Υե롦ƥˤ롣
.PP
.BR fchmod ()
ǰŪʥ顼󤲤:
.TP
.B EBADF
ե롦ǥץ
.I fd
ͭǤʤ
.TP
.B EIO
嵭򻲾ȡ
.TP
.B EPERM
嵭򻲾ȡ
.TP
.B EROFS
嵭򻲾ȡ
.SH 
4.4BSD, SVr4, POSIX.1-2001.
.SH Ϣ
.BR chown (2),
.BR execve (2),
.BR fchmodat (2),
.BR open (2),
.BR stat (2),
.BR path_resolution (7)