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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man2 / prctl.2

.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (C) 1998 Andries Brouwer (aeb@cwi.nl)
.\" and Copyright (C) 2002 Michael Kerrisk <mtk.manpages@gmail.com>
.\" and Copyright Guillem Jover <guillem@hadrons.org>
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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 Thu Nov 11 04:19:42 MET 1999, aeb: added PR_GET_PDEATHSIG
.\" Modified 27 Jun 02, Michael Kerrisk
.\"     Added PR_SET_DUMPABLE, PR_GET_DUMPABLE,
.\"     PR_SET_KEEPCAPS, PR_GET_KEEPCAPS
.\" Modified 2006-08-30 Guillem Jover <guillem@hadrons.org>
.\"     Updated Linux versions where the options where introduced.
.\"     Added PR_SET_TIMING, PR_GET_TIMING, PR_SET_NAME, PR_GET_NAME,
.\"     PR_SET_UNALIGN, PR_GET_UNALIGN, PR_SET_FPEMU, PR_GET_FPEMU,
.\"     PR_SET_FPEXC, PR_GET_FPEXC
.\" 2008-04-29 Serge Hallyn, Document PR_CAPBSET_READ and PR_CAPBSET_DROP
.\" 2008-06-13 Erik Bosman, <ejbosman@cs.vu.nl>
.\"     Document PR_GET_TSC and PR_SET_TSC.
.\" 2008-06-15 mtk, Document PR_SET_SECCOMP, PR_GET_SECCOMP
.\"
.\" Japanese Version Copyright (c) 1998-1999 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated 1999-04-03, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated 2002-12-20, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2005-09-06, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2005-10-07, Akihiro MOTOKI
.\" Updated 2007-01-08, Akihiro MOTOKI, LDP v2.43
.\" Updated 2007-10-12, Akihiro MOTOKI, LDP v2.66
.\" Updated 2008-08-12, Akihiro MOTOKI, LDP v3.05
.\"
.\"WORD:        capability      ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£
.\"WORD:        keep capabilities       ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£ÊÝ»ý
.\"
.TH PRCTL 2 2008-07-16 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O prctl \- operations on a process
prctl \- ¥×¥í¥»¥¹¤ÎÁàºî¤ò¹Ô¤Ê¤¦
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B #include <sys/prctl.h>
.sp
.BI "int prctl(int " option ", unsigned long " arg2 ", unsigned long " arg3 ,
.BI "          unsigned long " arg4 ", unsigned long " arg5 );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O .BR prctl ()
.\"O is called with a first argument describing what to do
.\"O (with values defined in \fI<linux/prctl.h>\fP), and further
.\"O arguments with a significance depending on the first one.
.\"O The first argument can be:
.BR prctl ()
¤ÎÆ°ºî¤ÏºÇ½é¤Î°ú¤­¿ô¤Ë¤è¤Ã¤Æ·èÄꤵ¤ì¤ë (¤³¤ÎÃͤÏ
\fI<linux/prctl.h>\fP ¤ËÄêµÁ¤µ¤ì¤Æ¤¤¤ë)¡£
»Ä¤ê¤Î°ú¤­¿ô¤ÏºÇ½é¤Î°ú¤­¿ô¤Ë¤è¤Ã¤ÆÊѲ½¤¹¤ë¡£
°ìÈÖÌܤΰú¤­¿ô¤È¤·¤Æ°Ê²¼¤Î¤â¤Î¤ò»ØÄê¤Ç¤­¤ë:
.TP
.\"O .BR PR_CAPBSET_READ " (since Linux 2.6.25)
.BR PR_CAPBSET_READ " (Linux 2.6.25 °Ê¹ß)"
.\"O Return (as the function result) 1 if the capability specified in
.\"O .I arg2
.\"O is in the calling thread's capability bounding set,
.\"O or 0 if it is not.
.\"O (The capability constants are defined in
.\"O .IR <linux/capability.h> .)
.\"O The capability bounding set dictates
.\"O whether the process can receive the capability through a
.\"O file's permitted capability set on a subsequent call to
.\"O .BR execve (2).
¤Ç»ØÄꤵ¤ì¤¿¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤¬¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤Î¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£
¥Ð¥¤¥ó¥Ç¥£¥ó¥°¥»¥Ã¥È (capability bounding set) ¤Ë´Þ¤Þ¤ì¤Æ¤¤¤ë¾ì¹ç¡¢
(´Ø¿ô¤ÎÊÖ¤êÃͤȤ·¤Æ) 1 ¤òÊÖ¤·¡¢¤½¤¦¤Ç¤Ê¤¤¾ì¹ç 0 ¤òÊÖ¤¹
(¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£Äê¿ô¤Ï
.I <linux/capability.h>
¤ÇÄêµÁ¤µ¤ì¤Æ¤¤¤ë)¡£
¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¥Ð¥¦¥ó¥Ç¥£¥ó¥°¥»¥Ã¥È¤Ï¡¢
.BR execve (2)
¤ò¸Æ¤Ó½Ð¤·¤¿ºÝ¤Ë¡¢¥Õ¥¡¥¤¥ë¤Îµö²Ä (permitted) ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤ÎÃæ¤Ç
¤½¤Î¥×¥í¥»¥¹¤¬³ÍÆÀ¤Ç¤­¤ë¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤ò»Ø¼¨¤¹¤ë¤â¤Î¤Ç¤¢¤ë¡£

.\"O If the capability specified in
.\"O .I arg2
.\"O is not valid, then the call fails with the error
.\"O .BR EINVAL .
.I arg2
¤Ë»ØÄꤵ¤ì¤¿¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤¬Í­¸ú¤Ç¤Ê¤¤¾ì¹ç¡¢
¸Æ¤Ó½Ð¤·¤Ï¥¨¥é¡¼
.B EINVAL
¤Ç¼ºÇÔ¤¹¤ë¡£
.TP
.\"O .BR PR_CAPBSET_DROP " (since Linux 2.6.25)"
.BR PR_CAPBSET_DROP " (Linux 2.6.25 °Ê¹ß)"
.\"O If the calling thread has the
.\"O .B CAP_SETPCAP
.\"O capability, then drop the capability specified by
.\"O .I arg2
.\"O from the calling thread's capability bounding set.
.\"O Any children of the calling thread will inherit the newly
.\"O reduced bounding set.
¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤¬¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£
.B CAP_SETPCAP
¤ò»ý¤Ã¤Æ¤¤¤ë¾ì¹ç¡¢
¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤Î¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¥Ð¥¦¥ó¥Ç¥£¥ó¥°¥»¥Ã¥È¤«¤é
.I arg2
¤Ç»ØÄꤵ¤ì¤¿¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤ò³°¤¹¡£
¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤Î»Ò¥×¥í¥»¥¹¤ÏÊѹ¹¸å¤Î¥Ð¥¦¥ó¥Ç¥£¥ó¥°¥»¥Ã¥È¤ò
·Ñ¾µ¤¹¤ë¡£

.\"O The call fails with the error:
.\"O .B EPERM
.\"O if the calling thread does not have the
.\"O.BR CAP_SETPCAP ;
.\"O .BR EINVAL
.\"O if
.\"O .I arg2
.\"O does not represent a valid capability; or
.\"O .BR EINVAL
.\"O if file capabilities are not enabled in the kernel,
.\"O in which case bounding sets are not supported.
¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤¬
.B CAP_SETPCAP
¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤¾ì¹ç¡¢¸Æ¤Ó½Ð¤·¤Ï¥¨¥é¡¼
.B EPERM
¤Ç¼ºÇÔ¤¹¤ë¡£
.I arg2
¤Ë»ØÄꤵ¤ì¤¿¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤¬Í­¸ú¤Ç¤Ê¤¤¾ì¹ç¡¢
.B EINVAL
¤Ç¼ºÇÔ¤¹¤ë¡£
¥Õ¥¡¥¤¥ë¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤¬¥«¡¼¥Í¥ë¤ÇÍ­¸ú¤Ë¤Ê¤Ã¤Æ¤¤¤Ê¤¤¾ì¹ç
(¤³¤Î¾ì¹ç¤Ë¤Ï¥Ð¥¦¥ó¥Ç¥£¥ó¥°¥»¥Ã¥È¤¬¥µ¥Ý¡¼¥È¤µ¤ì¤Ê¤¤)¡¢
.B EINVAL
¤Ç¼ºÇÔ¤¹¤ë¡£
.TP
.\"O .BR PR_SET_DUMPABLE " (since Linux 2.3.20)"
.BR PR_SET_DUMPABLE " (Linux 2.3.20 °Ê¹ß)"
.\"O Set the state of the flag determining whether core dumps are produced
.\"O for this process upon delivery of a signal whose default behavior is
.\"O to produce a core dump.
.\"O (Normally this flag is set for a process by default, but it is cleared
.\"O when a set-user-ID or set-group-ID program is executed and also by
.\"O various system calls that manipulate process UIDs and GIDs).
.\"O In kernels up to and including 2.6.12,
.\"O .I arg2
.\"O must be either 0 (process is not dumpable) or 1 (process is dumpable).
(Linux 2.3.20 °Ê¹ß)
¥Ç¥Õ¥©¥ë¥È¤Î¿¶¤ëÉñ¤¤¤Ç¤Ï¥³¥¢¥À¥ó¥×¤ò°ú¤­µ¯¤³¤¹¤è¤¦¤Ê¥·¥°¥Ê¥ë¤ò¼õ¿®¤·¤¿¤È¤­¤Ë¡¢
¥³¥¢¥À¥ó¥×¤¹¤ë¤«¤É¤¦¤«¤ò·èÄꤹ¤ë¥Õ¥é¥°¤òÀßÄꤹ¤ë
(Ä̾盧¤Î¥Õ¥é¥°¤Ï¡¢¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¥»¥Ã¥È¤µ¤ì¤Æ¤¤¤ë¤¬¡¢
set-user-ID ¤¢¤ë¤¤¤Ï set-group-ID ¥×¥í¥°¥é¥à¤¬¼Â¹Ô¤µ¤ì¤¿¤ê¡¢
¤µ¤Þ¤¶¤Þ¤Ê¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ë¤è¤Ã¤Æ¥×¥í¥»¥¹¤Î UID ¤ä GID ¤¬Áàºî¤µ¤ì¤¿¤È¤­¤Ë
¥¯¥ê¥¢¤µ¤ì¤ë)¡£
2.6.12 °ÊÁ°¤Î¥«¡¼¥Í¥ë¤Ç¤Ï¡¢
.I arg2
¤Ï 0 (¥×¥í¥»¥¹¤Ï¥À¥ó¥×ÉÔ²Ä) ¤¢¤ë¤¤¤Ï 1 (¥×¥í¥»¥¹¤Ï¥À¥ó¥×²Äǽ) ¤Î
¤É¤Á¤é¤«¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
.\"O Between kernels 2.6.13 and 2.6.17, the value 2 was also permitted,
.\"O which caused any binary which normally would not be dumped
.\"O to be dumped readable by root only;
.\"O for security reasons, this feature has been removed.
2.6.13 ¤«¤é 2.6.17 ¤Þ¤Ç¤Î¥«¡¼¥Í¥ë¤Ç¤Ï¡¢ÃÍ 2 ¤âǧ¤á¤é¤ì¤Æ¤¤¤¿¡£
¤³¤ÎÃͤò»ØÄꤹ¤ë¤È¡¢Ä̾ï¤Ï¥À¥ó¥×¤µ¤ì¤Ê¤¤¥Ð¥¤¥Ê¥ê¤¬ root ¤À¤±¤¬
Æɤ߹þ¤ß²Äǽ¤Ê·Á¤Ç¥À¥ó¥×¤µ¤ì¤¿¡£
¥»¥­¥å¥ê¥Æ¥£¾å¤ÎÍýͳ¤«¤é¡¢¤³¤Îµ¡Ç½¤Ïºï½ü¤µ¤ì¤¿
.\" See http://marc.theaimsgroup.com/?l=linux-kernel&m=115270289030630&w=2
.\" Subject:    Fix prctl privilege escalation (CVE-2006-2451)
.\" From:       Marcel Holtmann <marcel () holtmann ! org>
.\" Date:       2006-07-12 11:12:00
.\"O (See also the description of
.\"O .I /proc/sys/fs/suid_dumpable
.\"O in
.\"O .BR proc (5).)
.RB ( proc (5)
¤Î
.I /proc/sys/fs/suid_dumpable
¤ÎÀâÌÀ¤â»²¾È)¡£
.TP
.\"O .BR PR_GET_DUMPABLE " (since Linux 2.3.20)"
.BR PR_GET_DUMPABLE " (Linux 2.3.20 °Ê¹ß)"
.\"O Return (as the function result) the current state of the calling
.\"O process's dumpable flag.
(Linux 2.3.20 °Ê¹ß)
¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Ë¤ª¤±¤ë¥À¥ó¥×²Äǽ¥Õ¥é¥°¤Î
¸½ºß¤Î¾õÂÖ¤ò (´Ø¿ô¤ÎÊÖ¤êÃͤȤ·¤Æ) ÊÖ¤¹¡£
.\"O .\" Since Linux 2.6.13, the dumpable flag can have the value 2,
.\"O .\" but in 2.6.13 PR_GET_DUMPABLE simply returns 1 if the dumpable
.\"O .\" flags has a nonzero value.  This was fixed in 2.6.14.
.\" [Í×½¤Àµ] Linux 2.6.13 °Ê¹ß¤Ç¤Ï¡¢¥À¥ó¥×²Äǽ¥Õ¥é¥°¤ÏÃÍ 2 ¤ò¤È¤ë¤³¤È¤¬
.\" ¤Ç¤­¤ë¤¬¡¢2.6.13 ¤Ç¤Ï PR_GET_DUMPABLE ¤Ï¥À¥ó¥×²Äǽ¥Õ¥é¥°¤¬ 0 °Ê³°¤Î
.\" Ãͤξì¹ç 1 ¤òÊÖ¤¹¤À¤±¤Ç¤¢¤ë¡£¤³¤ì¤Ï 2.6.14 ¤Ç½¤Àµ¤µ¤ì¤¿¡£
.TP
.\"O .BR PR_SET_ENDIAN " (since Linux 2.6.18, PowerPC only)"
.BR PR_SET_ENDIAN " (Linux 2.6.18 °Ê¹ß¡¢PowerPC ¤Î¤ß)"
.\"O Set the endian-ness of the calling process to the value given
.\"O in \fIarg2\fP, which should be one of the following:
.\"O .\" Respectively 0, 1, 2
.\"O .BR PR_ENDIAN_BIG ,
.\"O .BR PR_ENDIAN_LITTLE ,
.\"O or
.\"O .B PR_ENDIAN_PPC_LITTLE
.\"O (PowerPC pseudo little endian).
¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î¥¨¥ó¥Ç¥£¥¢¥óÀßÄê (endian-ness) ¤ò
\fIarg2\fP ¤Ç»ØÄꤵ¤ì¤¿ÃͤËÀßÄꤹ¤ë¡£
»ØÄê¤Ç¤­¤ëÃͤÏ
.\" ¤½¤ì¤¾¤ì 0, 1, 2
.BR PR_ENDIAN_BIG ,
.BR PR_ENDIAN_LITTLE ,
.B PR_ENDIAN_PPC_LITTLE
(PowerPC µ¼»÷¥ê¥È¥ë¥¨¥ó¥Ç¥£¥¢¥ó)
¤Î¤¤¤º¤ì¤«°ì¤Ä¤Ç¤¢¤ë¡£
.TP
.\"O .BR PR_GET_ENDIAN " (since Linux 2.6.18, PowerPC only)"
.BR PR_GET_ENDIAN " (Linux 2.6.18 °Ê¹ß¡¢PowerPC ¤Î¤ß)"
.\"O Return the endian-ness of the calling process,
.\"O in the location pointed to by
.\"O .IR "(int\ *) arg2" .
¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î¥¨¥ó¥Ç¥£¥¢¥óÀßÄê (endian-ness) ¤ò
.I "(int\ *) arg2"
¤¬»Ø¤¹¾ì½ê¤Ë³ÊǼ¤·¤ÆÊÖ¤¹¡£
.TP
.\"O .BR PR_SET_FPEMU " (since Linux 2.4.18, 2.5.9, only on ia64)"
.BR PR_SET_FPEMU " (Linux 2.4.18 °Ê¹ß, 2.5.9, ia64 ¤Î¤ß)"
.\"O Set floating-point emulation control bits to \fIarg2\fP.
.\"O Pass \fBPR_FPEMU_NOPRINT\fP to silently emulate fp operations accesses, or
.\"O \fBPR_FPEMU_SIGFPE\fP to not emulate fp operations and send
.\"O .B SIGFPE
.\"O instead.
ÉâÆ°¾®¿ôÅÀ¥¨¥ß¥å¥ì¡¼¥·¥ç¥ó (floating-point emulation) À©¸æ¥Ó¥Ã¥È¤ò
\fIarg2\fP ¤Ç»ØÄꤵ¤ì¤¿ÃͤËÀßÄꤹ¤ë¡£
»ØÄê¤Ç¤­¤ëÃÍ¤Ï \fBPR_FPEMU_NOPRINT\fP (ÉâÆ°¾®¿ôÅÀÌ¿Îᥢ¥¯¥»¥¹¤òÌۤäÆ
¥¨¥ß¥å¥ì¡¼¥È¤¹¤ë) ¤« \fBPR_FPEMU_SIGFPE\fP (ÉâÆ°¾®¿ôÅÀÌ¿Îá¤ò¥¨¥ß¥å¥ì¡¼¥È¤»¤º¡¢
Âå¤ï¤ê¤Ë
.B SIGFPE
¤òÁ÷¤ë) ¤Ç¤¢¤ë¡£
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.\"O .BR PR_GET_FPEMU " (since Linux 2.4.18, 2.5.9, only on ia64)"
.BR PR_GET_FPEMU " (Linux 2.4.18 °Ê¹ß, 2.5.9, ia64 ¤Î¤ß)"
.\"O Return floating-point emulation control bits,
.\"O in the location pointed to by
.\"O .IR "(int\ *) arg2" .
ÉâÆ°¾®¿ôÅÀ¥¨¥ß¥å¥ì¡¼¥·¥ç¥óÀ©¸æ¥Ó¥Ã¥È¤ÎÃͤò
.I "(int\ *) arg2"
¤¬»Ø¤¹¾ì½ê¤Ë³ÊǼ¤·¤ÆÊÖ¤¹¡£
.TP
.\"O .BR PR_SET_FPEXC " (since Linux 2.4.21, 2.5.32, only on PowerPC)"
.BR PR_SET_FPEXC " (Linux 2.4.21 ¤ª¤è¤Ó 2.5.32 °Ê¹ß¡¢PowerPC ¤Î¤ß)"
.\"O Set floating-point exception mode to \fIarg2\fP.
.\"O Pass \fBPR_FP_EXC_SW_ENABLE\fP to use FPEXC for FP exception enables,
.\"O \fBPR_FP_EXC_DIV\fP for floating-point divide by zero,
.\"O \fBPR_FP_EXC_OVF\fP for floating-point overflow,
.\"O \fBPR_FP_EXC_UND\fP for floating-point underflow,
.\"O \fBPR_FP_EXC_RES\fP for floating-point inexact result,
.\"O \fBPR_FP_EXC_INV\fP for floating-point invalid operation,
.\"O \fBPR_FP_EXC_DISABLED\fP for FP exceptions disabled,
.\"O \fBPR_FP_EXC_NONRECOV\fP for async nonrecoverable exception mode,
.\"O \fBPR_FP_EXC_ASYNC\fP for async recoverable exception mode,
.\"O \fBPR_FP_EXC_PRECISE\fP for precise exception mode.
ÉâÆ°¾®¿ôÅÀÎã³°¥â¡¼¥É (floating-point exception mode) ¤ò
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»ØÄê¤Ç¤­¤ë¤Î¤Ï°Ê²¼¤ÎÃͤǤ¢¤ë:
\fBPR_FP_EXC_SW_ENABLE\fP (FPEXC ¤ÇÉâÆ°¾®¿ôÅÀÎã³°¤òÍ­¸ú¤Ë¤¹¤ë)¡¢
\fBPR_FP_EXC_DIV\fP (0 ½ü»»)¡¢
\fBPR_FP_EXC_OVF\fP (¥ª¡¼¥Ð¡¼¥Õ¥í¡¼)¡¢
\fBPR_FP_EXC_UND\fP (¥¢¥ó¥À¡¼¥Õ¥í¡¼)¡¢
\fBPR_FP_EXC_RES\fP (ÉÔÀµ³Î¤Ê·ë²Ì (inexact result))¡¢
\fBPR_FP_EXC_INV\fP (ÉÔÀµ¤ÊÌ¿Îá (invalid operation))¡¢
\fBPR_FP_EXC_DISABLED\fP (ÉâÆ°¾®¿ôÅÀÎã³°¤ò̵¸ú¤Ë¤¹¤ë)¡¢
\fBPR_FP_EXC_NONRECOV\fP (async nonrecoverable exception mode)¡¢
\fBPR_FP_EXC_ASYNC\fP (async recoverable exception mode)¡¢
\fBPR_FP_EXC_PRECISE\fP (precise exception mode)¡£
.TP
.\"O .BR PR_GET_FPEXC " (since Linux 2.4.21, 2.5.32, only on PowerPC)"
.BR PR_GET_FPEXC "(Linux 2.4.21 ¤ª¤è¤Ó 2.5.32 °Ê¹ß¡¢PowerPC ¤Î¤ß)"
.\"O Return floating-point exception mode,
.\"O in the location pointed to by
.\"O .IR "(int\ *) arg2" .
ÉâÆ°¾®¿ôÅÀÎã³°¥â¡¼¥É¤ÎÃͤò
.I "(int\ *) arg2"
¤¬»Ø¤¹¾ì½ê¤Ë³ÊǼ¤·¤ÆÊÖ¤¹¡£
.TP
.\"O .BR PR_SET_KEEPCAPS " (since Linux 2.2.18)"
.BR PR_SET_KEEPCAPS " (Linux 2.2.18 °Ê¹ß)"
.\"O Set the state of the thread's "keep capabilities" flag,
.\"O which determines whether the threads's effective and permitted
.\"O capability sets are cleared when a change is made to the threads's user IDs
.\"O such that the threads's real UID, effective UID, and saved set-user-ID
.\"O all become nonzero when at least one of them previously had the value 0.
.\"O (By default, these credential sets are cleared).
.\"O .I arg2
.\"O must be either 0 (capabilities are cleared) or 1 (capabilities are kept).
.\"O This value will be reset to 0 on subsequent calls to
.\"O .BR execve (2).
¥¹¥ì¥Ã¥É¤Î¡Ö¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£ÊÝ»ý¡×¥Õ¥é¥°¤òÀßÄꤹ¤ë¡£
¤³¤Î¥Õ¥é¥°¤Ï¡¢¥¹¥ì¥Ã¥É¤Î¼Â UID¡¢¼Â¸ú UID¡¢Êݸ set-user-ID ¤Î¤¦¤Á¾¯¤Ê¤¯¤È¤â
°ì¤Ä¤¬ 0 ¤Ç¤¢¤Ã¤¿¾õÂÖ¤«¤é¡¢¤³¤ì¤éÁ´¤Æ¤¬ 0 °Ê³°¤ËÊѹ¹¤µ¤ì¤¿¤È¤­¡¢
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.I arg2
¤Ï 0 (¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤ò¥¯¥ê¥¢¤¹¤ë) ¤¢¤ë¤¤¤Ï 1 (¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤òÊÝ»ý¤¹¤ë) ¤Î
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¤¬¸Æ¤Ó½Ð¤µ¤ì¤ë¤È¡¢¤³¤ÎÃÍ¤Ï 0 ¤Ë¥ê¥»¥Ã¥È¤µ¤ì¤ë¡£
.TP
.\"O .BR PR_GET_KEEPCAPS " (since Linux 2.2.18)"
.BR PR_GET_KEEPCAPS " (Linux 2.2.18 °Ê¹ß)"
.\"O Return (as the function result) the current state of the calling threads's
.\"O "keep capabilities" flag.
¸Æ¤Ó½Ð¤·¸µ¥¹¥ì¥Ã¥É¤Ë¤ª¤±¤ë¡Ö¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£ÊÝ»ý¡×¥Õ¥é¥°¤Î
¸½ºß¤Î¾õÂÖ¤ò (´Ø¿ô¤ÎÊÖ¤êÃͤȤ·¤Æ) ÊÖ¤¹¡£
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.\"O .BR PR_SET_NAME " (since Linux 2.6.9)"
.BR PR_SET_NAME " (Linux 2.6.9 °Ê¹ß)"
.\"O Set the process name for the calling process,
.\"O using the value in the location pointed to by
.\"O .IR "(char\ *) arg2" .
.\"O The name can be up to 16 bytes long,
.\"O .\" TASK_COMM_LEN in include/linux/sched.h
.\"O and should be null-terminated if it contains fewer bytes.
¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î¥×¥í¥»¥¹Ì¾¤ò
.I "(char\ *) arg2"
¤¬»Ø¤¹¾ì½ê¤Ë³ÊǼ¤µ¤ì¤¿Ãͤò»È¤Ã¤ÆÀßÄꤹ¤ë¡£
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.\" TASK_COMM_LEN in include/linux/sched.h
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.\"O .BR PR_GET_NAME " (since Linux 2.6.11)"
.BR PR_GET_NAME " (Linux 2.6.11 °Ê¹ß)"
.\"O Return the process name for the calling process,
.\"O in the buffer pointed to by
.\"O .IR "(char\ *) arg2" .
.\"O The buffer should allow space for up to 16 bytes;
.\"O the returned string will be null-terminated if it is shorter than that.
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.\"O .BR PR_SET_PDEATHSIG " (since Linux 2.1.57)"
.BR PR_SET_PDEATHSIG " (Linux 2.1.57 °Ê¹ß)"
.\"O Set the parent process death signal
.\"O of the calling process to \fIarg2\fP (either a signal value
.\"O in the range 1..maxsig, or 0 to clear).
.\"O This is the signal that the calling process will get when its
.\"O parent dies.
.\"O This value is cleared for the child of a
.\"O .BR fork (2).
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.\"O .BR PR_GET_PDEATHSIG " (since Linux 2.3.15)"
.BR PR_GET_PDEATHSIG " (Linux 2.3.15 °Ê¹ß)"
.\"O Return the current value of the parent process death signal,
.\"O in the location pointed to by
.\"O .IR "(int\ *) arg2" .
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.\"O .BR PR_SET_SECCOMP " (since Linux 2.6.23)"
.BR PR_SET_SECCOMP " (Linux 2.6.23 °Ê¹ß)"
.\" See http://thread.gmane.org/gmane.linux.kernel/542632
.\" [PATCH 0 of 2] seccomp updates
.\" andrea@cpushare.com
.\"O Set the secure computing mode for the calling thread.
.\"O In the current implementation,
.\"O .IR arg2
.\"O must be 1.
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.\"O After the secure computing mode has been set to 1,
.\"O the only system calls that the thread is permitted to make are
.\"O .BR read (2),
.\"O .BR write (2),
.\"O .BR _exit (2),
.\"O and
.\"O .BR sigreturn (2).
.\"O Other system calls result in the delivery of a
.\"O .BR SIGKILL
.\"O signal.
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.BR read (2),
.BR write (2),
.BR _exit (2),
.BR sigreturn (2)
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.\"O Secure computing mode is useful for number-crunching applications
.\"O that may need to execute untrusted byte code,
.\"O perhaps obtained by reading from a pipe or socket.
.\"O This operation is only available
.\"O if the kernel is configured with CONFIG_SECCOMP enabled.
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.\"O .BR PR_GET_SECCOMP " (since Linux 2.6.23)"
.BR PR_GET_SECCOMP " (Linux 2.6.23 °Ê¹ß)"
.\"O Return the secure computing mode of the calling thread.
.\"O Not very useful for the current implementation (mode equals 1),
.\"O but may be useful for other possible future modes:
.\"O if the caller is not in secure computing mode, this operation returns 0;
.\"O if the caller is in secure computing mode, then the
.\"O .BR prctl ()
.\"O call will cause a
.\"O .B SIGKILL
.\"O signal to be sent to the process.
.\"O This operation is only available
.\"O if the kernel is configured with CONFIG_SECCOMP enabled.
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.BR prctl ()
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.\"O .BR PR_SET_SECUREBITS " (since Linux 2.6.26)"
.BR PR_SET_SECUREBITS " (Linux 2.6.26 °Ê¹ß)"
.\"O Set the "securebits" flags of the calling thread to the value supplied in
.\"O .IR arg2 .
.\"O See
.\"O .BR capabilities (7).
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.\"O .BR PR_GET_SECUREBITS " (since Linux 2.6.26)"
.BR PR_GET_SECUREBITS " (Linux 2.6.26 °Ê¹ß)"
.\"O Return (as the function result)
.\"O the "securebits" flags of the calling thread.
.\"O See
.\"O .BR capabilities (7).
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.\"O .BR PR_SET_TIMING " (since Linux 2.6.0-test4)"
.BR PR_SET_TIMING " (Linux 2.6.0-test4 °Ê¹ß)"
.\"O Set whether to use (normal, traditional) statistical process timing or
.\"O accurate timestamp based process timing, by passing
.\"O .B PR_TIMING_STATISTICAL
.\"O .\" 0
.\"O or
.\"O .B PR_TIMING_TIMESTAMP
.\"O .\" 1
.\"O to \fIarg2\fP.
.\"O .B PR_TIMING_TIMESTAMP
.\"O is not currently implemented
.\"O (attempting to set this mode will yield the error
.\"O .BR EINVAL ).
.\"O .\" PR_TIMING_TIMESTAMP doesn't do anything in 2.6.26-rc8,
.\"O .\" and looking at the patch history, it appears
.\"O .\" that it never did anything.
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.\"O .BR PR_GET_TIMING " (since Linux 2.6.0-test4)"
.BR PR_GET_TIMING " (Linux 2.6.0-test4 °Ê¹ß)"
.\"O Return (as the function result) which process timing method is currently
.\"O in use.
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.\"O .BR PR_SET_TSC " (since Linux 2.6.26, x86 only)"
.BR PR_SET_TSC " (Linux 2.6.26 °Ê¹ß, x86 ¤Î¤ß)"
.\"O Set the state of the flag determining whether the timestamp counter
.\"O can be read by the process.
.\"O Pass
.\"O .B PR_TSC_ENABLE
.\"O to
.\"O .I arg2
.\"O to allow it to be read, or
.\"O .B PR_TSC_SIGSEGV
.\"O to generate a
.\"O .B SIGSEGV
.\"O when the process tries to read the timestamp counter.
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.\"O .BR PR_GET_TSC " (since Linux 2.6.26, x86 only)"
.BR PR_GET_TSC " (Linux 2.6.26 °Ê¹ß, x86 ¤Î¤ß)"
.\"O Return the state of the flag determining whether the timestamp counter
.\"O can be read,
.\"O in the location pointed to by
.\"O .IR "(int\ *) arg2" .
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.B PR_SET_UNALIGN
.\"O (Only on: ia64, since Linux 2.3.48; parisc, since Linux 2.6.15;
.\"O PowerPC, since Linux 2.6.18; Alpha, since Linux 2.6.22)
(ia64 ¤Ç¤Ï Linux 2.3.48 °Ê¹ß;
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.\"O Set unaligned access control bits to \fIarg2\fP.
.\"O Pass
.\"O \fBPR_UNALIGN_NOPRINT\fP to silently fix up unaligned user accesses,
.\"O or \fBPR_UNALIGN_SIGBUS\fP to generate
.\"O .B SIGBUS
.\"O on unaligned user access.
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.B PR_GET_UNALIGN
.\"O (see
.\"O .B PR_SET_UNALIGN
.\"O for information on versions and architectures)
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.\"O Return unaligned access control bits, in the location pointed to by
.\"O .IR "(int\ *) arg2" .
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.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On success,
.\"O .BR PR_GET_DUMPABLE ,
.\"O .BR PR_GET_KEEPCAPS ,
.\"O .BR PR_CAPBSET_READ ,
.\"O .BR PR_GET_TIMING ,
.\"O .BR PR_GET_SECUREBITS ,
.\"O and (if it returns)
.\"O .BR PR_GET_SECCOMP
.\"O return the nonnegative values described above.
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.BR PR_GET_KEEPCAPS ,
.BR PR_CAPBSET_READ ,
.BR PR_GET_TIMING ,
.BR PR_GET_SECUREBITS ,
.BR PR_GET_SECCOMP
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.\"O All other
.\"O .I option
.\"O values return 0 on success.
.I option
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.\"O On error, \-1 is returned, and
.\"O .I errno
.\"O is set appropriately.
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.\"O .SH ERRORS
.SH ¥¨¥é¡¼
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.B EFAULT
.\"O .I arg2
.\"O is an invalid address.
.I arg2
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.B EINVAL
.\"O The value of
.\"O .I option
.\"O is not recognized
.I option
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.B EINVAL
.\"O .I arg2
.\"O is not valid value for this
.\"O .IR option .
.I arg2
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.B EINVAL
.\"O .I option
.\"O is
.\"O .BR PR_SET_SECCOMP
.\"O or
.\"O .BR PR_SET_SECCOMP ,
.\"O and the kernel was not configured with
.\"O .BR CONFIG_SECCOMP .
.I option
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.B EPERM
.\"O .I option
.\"O is
.\"O .BR PR_SET_SECUREBITS ,
.\"O and the caller does not have the
.\"O .B CAP_SETPCAP
.\"O capability,
.\"O or tried to unset a "locked" flag,
.\"O or tried to set a flag whose corresponding locked flag was set
.\"O (see
.\"O .BR capabilities (7)).
.I option
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.B EPERM
.\"O .I option
.\"O is
.\"O .BR PR_SET_KEEPCAPS ,
.\"O and the callers's
.\"O .B SECURE_KEEP_CAPS_LOCKED
.\"O flag is set
.\"O (see
.\"O .BR capabilities (7)).
.I option
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.B EPERM
.\"O .I option
.\"O is
.\"O .BR PR_CAPBSET_DROP ,
.\"O and the caller does not have the
.\"O .B CAP_SETPCAP
.\"O capability.
.I option
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.\" The following can't actually happen, because prctl() in
.\" seccomp mode will cause SIGKILL.
.\" .TP
.\" .B EPERM
.\" .I option
.\" is
.\" .BR PR_SET_SECCOMP ,
.\" and secure computing mode is already 1.
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O The
.\"O .BR prctl ()
.\"O system call was introduced in Linux 2.1.57.
.\"O .\" The library interface was added in glibc 2.0.6
.BR prctl ()
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.\" ¥é¥¤¥Ö¥é¥ê¡¦¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤Ï glibc 2.0.6 ¤ÇÄɲ䵤줿¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O This call is Linux-specific.
.\"O IRIX has a
.\"O .BR prctl ()
.\"O system call (also introduced in Linux 2.1.44
.\"O as irix_prctl on the MIPS architecture),
.\"O with prototype
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.BR prctl ()
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.BI "ptrdiff_t prctl(int " option ", int " arg2 ", int " arg3 );
.sp
.\"O and options to get the maximum number of processes per user,
.\"O get the maximum number of processors the calling process can use,
.\"O find out whether a specified process is currently blocked,
.\"O get or set the maximum stack size, etc.
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.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR signal (2),
.BR core (5)