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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.\" manual page may be incorrect or out-of-date.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 Sun Aug 6 1995 Thomas K. Dyas <tdyas@eden.rutgers.edu>
.\" Modified Sat Jul 1 2000 aeb
.\"
.\" 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>
.\"
.\"WORD: identity
.\"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 "6 August 1995" "Linux 1.3.15" "Linux Programmer's Manual"
.SH ̾
setfsuid \- ե롦ƥåΤ˻Ѥ桼(identity)ꤹ
.SH
.B #include <unistd.h>
/* glibc uses <sys/fsuid.h> */
.sp
.BI "int setfsuid(uid_t " fsuid );
SH
.B setfsuid
Linux ͥ뤬ե롦ƥ(file system)Ф
ƤΥΥå˻Ѥ桼ID ꤹ롣̾
.I fsuid
ͤϼ¸(effective)桼ID ˤäƱƤ롣ºݤˡ
¸桼ID ѹ줿ˤ
.I fsuid
ޤ¸桼ID ͤѹ롣
.B setfsuid
ŪʸƤӽФ̾ϡLinux NFS С Τ褦ʡϢ
(real)桼ID ¸桼ID ѹ뤳Ȥʤ
ե˥桼 ID ѹ뤳Ȥɬפʥץ
ǤΤѤ롣NFS СΤ褦ʥץǤϡץ̾
桼ID ѹ뤳ȤϤΥ桼ID ˾ޤʤ
ʥ(signal)ˤ餵Ȥ
ƥۡ(security hole)ˤʤ롣
.B setfsuid
ϥѡ桼ˤäƸƤӽФ줿䡢
.I fsuid
(real)桼ID ¸(effective)桼ID
¸(saved)åȥ桼ID ߤ
.IR fsuid
ͤ˰פˤΤ롣
.SH ֤
硢
.I fsuid
ΰ֤ͤ롣顼ξ
.I fsuid
θߤ֤ͤ롣
.SH
.B setfsuid
Linux ͭǤꡢܿտޤץǻѤƤϤʤ
.SH Х
ʤΥ顼å֤ʤ
ƤӽФԤϺǤ
.B EPERM
餤֤٤Ǥ롣
.SH
glibc uid ȤȽǤϥƥࡦ
Ԥ鷺 \fIerrno\fP EINVAL ꤷ \-1 ֤롣
.SH Ϣ
.BR setfsgid (2)
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