.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
.\"
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.\" 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.
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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.\" manual page may be incorrect or out-of-date.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
.\" 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.
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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.
.\"
.\" 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 Mon Jun 24 14:29:55 JST 1996
.\"         by Yosiaki Yanagihara <yosiaki@bsd2.kbnes.nec.co.jp>
.\" Modified Mon May 11 15:05:52 JST 1998
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated & Modified Mon Jun 25 20:21:38 JST 2001
.\"         by Yuichi SATO <ysato@h4.dion.ne.jp>
.\" Updated & Modified Wed Dec 29 06:01:56 JST 2004
.\"         by Yuichi SATO <ysato444@yahoo.co.jp>
.\"
.TH CHMOD 2 2007-07-26 "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 
.I path
Ϳ줿ե롢
ޤ
.I fd
ǻȤեΥ⡼ɤѹ롣

⡼ɤϡγƥ⡼ɤ
.I or
ȤäΤǻꤹ:
.RS
.TP 1.0i
.B S_ISUID
04000 ¹ԻΥåȡ桼ID (set user ID)
.TP
.B S_ISGID
02000 ¹ԻΥåȡ롼סID (set group ID)
.TP
.B S_ISVTX
01000 ƥå (sticky) ӥå
.TP
.B S_IRUSR
00400 ͭ (owner) ˤɤ߼ (read)
.TP
.B S_IWUSR
00200 ͭԤˤ񤭹 (write)
.TP
.B S_IXUSR
00100 ͭԤˤ¹ (execute) /  (search)
.TP
.B S_IRGRP
00040 롼פˤɤ߼
.TP
.B S_IWGRP
00020 롼פˤ񤭹
.TP
.B S_IXGRP
00010 롼פˤ¹ / 
.TP
.B S_IROTH
00004 ¾ (others) ˤɤ߼
.TP
.B S_IWOTH
00002 ¾ͤˤ񤭹
.TP
.B S_IXOTH
00001 ¾ͤˤ¹ / 
.RE
.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)