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.\" Copyright (C) 1995, Thomas K. Dyas <tdyas@eden.rutgers.edu>
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" Created 1995-08-06 Thomas K. Dyas <tdyas@eden.rutgers.edu>
.\" Modified 2000-07-01 aeb
.\" Modified 2002-07-23 aeb
.\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@gmail.com>
.\" Added notes on capability requirements
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\" all rights reserved.
.\" Translated Sat Mar 1 00:55:10 JST 1997
.\" by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Modified Mon Sep 23 21:15:17 JST 2000
.\" by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Modified 2002-09-24 by Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Modified 2005-02-24, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.\"WORD: identity ID
.\"WORD: kernel ͥ
.\"WORD: file system ե롦ƥ
.\"WORD: effective user ID ¸桼ID
.\"WORD: real user ID ¥桼ID
.\"WORD: signal ʥ
.\"WORD: security hole ƥۡ
.\"WORD: saved set-user-ID ¸åȥ桼ID
.\"
.TH SETFSUID 2 2004-05-27 "Linux" "Linux Programmer's Manual"
.SH ̾
setfsuid \- ե롦ƥΥåѤ桼 ID ꤹ
.SH
.B #include <unistd.h>
/* glibc Ǥ <sys/fsuid.h> */
.sp
.BI "int setfsuid(uid_t " fsuid );
.SH
.BR setfsuid ()
Linux ͥ뤬ե롦ƥФ
ƤΥΥå˻Ѥ桼ID ꤹ롣̾
.I fsuid
ͤϼ¸ (effective) 桼ID Ʊˤʤ롣ºݡ
¸桼ID ѹ٤
.I fsuid
ޤ¸桼ID ͤѹ롣
̾
.BR setfsuid ()
.BR setfsgid ()
Ū˸ƤӽФΤϡLinux NFS С Τ褦ˡ
ե롦Ѥ桼ID / 롼ID ѹʤФʤʤ
б(real)/¸(effective) 桼ID / 롼ID ѹʤ褦
ץ˸¤롣
NFS СΤ褦ʥץǡ̾Υ桼ID ѹȡ
ץ˾ޤʤʥˤ餹ǽꡢ
ƥۡˤʤ롣()
.BR setfsuid ()
ϡѡ桼ˤäƸƤӽФ줿礫
.I fsuid
¥桼ID¸桼ID
¸åȥ桼ID (saved set-user-ID)ߤ
.I fsuid
ͤΤ줫˰פˤΤ롣
.SH ֤
硢
.I fsuid
ΰ֤ͤ顼ξ
.I fsuid
θߤ֤ͤ
.SH
.BR setfsuid ()
Linux ͭǤꡢܿꤷץǻѤƤϤʤ
1.1.44 ʹߤ Linux ͥ 4.7.6 ʹߤ libc ¸ߤ롣
.SH
glibc 桼ID ȤȽǤϡ
ƥࡦԤ鷺 \fIerrno\fP
.B EINVAL
ꤷ \-1 ֤롣
.LP
Υƥॳ뤬Ƴ줿ץ
Ʊ¸桼IDΥץإʥ뤳ȤǤ
Ǥϡʥ¤ΰϤʤ㤦ΤˤʤäƤ롣
.SH Х
ʤΥ顼åƤӽФ֤ʤ
Ԥ (ƤӽФˤ
.B CAP_SETUID
ѥӥƥʤäΤ) Ǥ
.B EPERM
餤֤٤Ǥ롣
.SH Ϣ
.BR kill (2),
.BR setfsgid (2),
.BR capabilities (7),
.BR credentials (7)
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