.\" (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\" License.
.\" Modified Sat Jul 24 17:51:42 1993 by Rik Faith (faith@cs.unc.edu)
.\" Modified Tue Aug 17 11:42:20 1999 by Ariel Scolnicov (ariels@compugen.co.il)
.\"
.\" Japanese Version Copyright (c) 1998 ISHIKAWA Mutsumi, all rights reserved.
.\" Translated 1998-06-03, ISHIKAWA Mutsumi <ishikawa@linux.or.jp>
.\" Updated 1999-12-08, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2002-10-16, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2005-03-15, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH SYSCONF 3  2007-12-12 "GNU" "Linux Programmer's Manual"
.SH ̾
sysconf \- ư
.SH 
.nf
.B #include <unistd.h>
.sp
.BI "long sysconf(int " "name" );
.fi
.SH 
POSIX Ǥϡץꥱ󤬥ѥ¹Իˡ
Υץ󤬥ݡȤƤ뤫䡢
ǽ¤ɤͤƥȤ뤳ȤǤ롣
.LP
ѥ˹Ԥˤϡ
.I <unistd.h>

.I <limits.h>
ξ⤷ϰ򥤥󥯥롼ɤ
Υޥͤǧ롣
.LP
¹Իˤϡؿ
.BR sysconf ()
Ȥäƿͤ䤤碌뤳ȤǤ롣
ե뤬¸ߤե륷ƥ˴ؤͤϡ
.BR fpathconf (3)

.BR pathconf (3)
ȤäƳǧǤ롣
ʸͤ
.BR confstr (3)
ȤäƳǧǤ롣
.LP
δؿǼͤǽʥƥǤ롣
ϥץ¸֤δ֤Ѳʤ
.\" â RLIMIT_NOFILE եȡߥåȤѹ setrlimit() ƤӽФ
.\" Ǥϡ sysconf(_SC_OPEN_MAX) ֤ͤѲ뤫⤷ʤ
.LP
ץǧǤ褦ˡƤ
.I <unistd.h>

.B _POSIX_FOO
Ƥ롣
ƤʤȤϡ¹Ի䤤碌Ԥɬפ롣
ͤ \-1 ƤȤϡΥץϥݡȤƤʤ
0 ƤȤϡϢؿإåե뤬¸ߤ뤬
ɤ٥ݡȤƤ뤫ϼ¹Ի˳ǧʤФʤʤ
\-1 Ǥ 0 ǤʤͤƤȤϡΥץ󤬥ݡ
Ƥ롣̾ϡΥץˤĤƵܤ POSIX βǯ
򼨤ͤˤʤäƤ (㤨 200112L)
glibc Ǥ 1 ꤵƤȡΥץϥݡȤƤ뤬
POSIX βǤޤȯԤƤʤȤ򼨤
.\" 999 ϡΥץϥݡȤƤ뤬
.\" ǿɸˤϤϤ¸ߤʤȤ򼨤(?)
.BR sysconf ()
ΰˤ
.B _SC_FOO
ꤹ롣
ץΥꥹȤˤĤƤ
.BR posixoptions (7)
򻲾ȤΤȡ
.LP
ѿ¤ǧǤ褦ˡƤϡ
.I <limits.h>

.B _FOO

.I <unistd.h>

.B _POSIX_FOO
Ƥ롣
¤ʤʤ
ƤȤˤϡͤݾڤ줿ͤǤꡢ
ºݤ˥ݡȤƤ뤳Ȥ⤢롣
ץꥱ󤬥ƥѲͤѤˤϡ
.BR sysconf ()
ƤӽФȤǼ¸Ǥ롣
.BR sysconf ()
ΰˤ
.B _SC_FOO
ꤹ롣
.SS "POSIX.1 ѿ"
ѿ̾ͤΤ˻Ȥ
.BR sysconf ()
Υѥ᡼̾ñʲ˼
.LP
ޤ POSIX.1 ߴѿ򼨤
.TP
.BR ARG_MAX " - " _SC_ARG_MAX
.BR exec (3)
ؿΰκĹ
.B _POSIX_ARG_MAX
(4096) ̤ǤäƤϤʤʤ
.TP
.BR CHILD_MAX " - " _SC_CHILD_MAX
桼ID Ʊ¸ߤǤץκ
.B _POSIX_CHILD_MAX
(25) ̤ǤäƤϤʤʤ
.TP
.BR HOST_NAME_MAX " - " _SC_HOST_NAME_MAX
.BR gethostname (2)
֤ۥ̾κĹ NULL ХȤĹ˴ޤޤʤ
.B _POSIX_HOST_NAME_MAX
(255) ̤ǤäƤϤʤʤ
.TP
.BR LOGIN_NAME_MAX " - " _SC_LOGIN_NAME_MAX
̾Ĺκ͡ NULL ХȤĹ˴ޤޤ롣
.B _POSIX_LOGIN_NAME_MAX
(9) ̤ǤäƤϤʤʤ
.TP
.BR "" "clock ticks - " _SC_CLK_TCK
1äΥåƥå
бѿѻߤ줿ѿʤ
.B CLK_TCK
ȸƤФƤ
(: ޥ
.B CLOCKS_PER_SEC
Ͼʤ: ͤ 1000000 ǤʤФʤʤ)
.TP
.BR OPEN_MAX " - " _SC_OPEN_MAX
ĤΥץƱ˥ץǤեξ¡
.B _POSIX_OPEN_MAX
(20) ̤ǤäƤϤʤʤ
.TP
.BR PAGESIZE " - " _SC_PAGESIZE
Хñ̤ǤΥڡ
1 꾮ʤäƤϤʤʤ
( PAGE_SIZE Ȥƥ⤢)
.TP
.BR RE_DUP_MAX " - " _SC_RE_DUP_MAX
.BR regexec (3)

.BR regcomp (3)
ǵƤƤ BRE (Basic Regular Expression; ɽ)
η֤иκ͡
.B _POSIX2_RE_DUP_MAX
(255) ̤ǤäƤϤʤʤ
.TP
.BR STREAM_MAX " - " _SC_STREAM_MAX
ĤΥץƱ˥ץǤ륹ȥ꡼ξ¡
Ƥˤϡͤɸ C ޥ
.B FOPEN_MAX
ƱǤ롣
.B _POSIX_STREAM_MAX
(8) ̤ǤäƤϤʤʤ
.TP
.B SYMLOOP_MAX
ѥ̾β˸Ƥ褤ܥå󥯤κ
οĶȡѥ̾
.B ELOOP
֤롣
.B _POSIX_SYMLOOP_MAX
(8) ̤ǤäƤϤʤʤ
.TP
.BR TTY_NAME_MAX " - " _SC_TTY_NAME_MAX
üǥХ̾κĹĹˤ NULL ХȤޤޤ롣
.B _POSIX_TTY_NAME_MAX
(9) ̤ǤäƤϤʤʤ
.TP
.BR TZNAME_MAX " - " _SC_TZNAME_MAX
ॾ̾ȤƻȤХȿκ͡
.B _POSIX_TZNAME_MAX
(6) ̤ǤäƤϤʤʤ
.TP
.BR _POSIX_VERSION " - " _SC_VERSION
POSIX.1 ɸबǧ줿ǯ
.B YYYYMML
Ȥ񼰤Ǥ롣
.B 199009L
Ȥͤϡ1990ǯ 9 Ǥ뤳Ȥ򼨤
.SS "POSIX.2 ѿ"
ˡPOSIX.2 ͤ򼨤
ϳƥ桼ƥƥФ¤ꤹ롣
.TP
.BR BC_BASE_MAX " - " _SC_BC_BASE_MAX
.BR bc (1)
桼ƥƥǵƤ
.I obase
κ͡
.TP
.BR BC_DIM_MAX " - " _SC_BC_DIM_MAX
.BR bc (1)
ǵƤĤǿκ͡
.TP
.BR BC_SCALE_MAX " - " _SC_BC_SCALE_MAX
.BR bc (1)
ǵ
.I scale
κ͡
.TP
.BR BC_STRING_MAX " - " _SC_BC_STRING_MAX
.BR bc (1)
ǵƤʸκĹ
.TP
.BR COLL_WEIGHTS_MAX " - " _SC_COLL_WEIGHTS_MAX
ե
.B LC_COLLATE order
ɤΥȥ˳ƲǽʽŤߤκ͡
.TP
.BR EXPR_NEST_MAX " - " _SC_EXPR_NEST_MAX
.BR expr (1)
ˤơ̤ҤˤǤ뼰κ
.TP
.BR LINE_MAX " - " _SC_LINE_MAX
桼ƥƥϹԤκĹɸϤǤʤե뤫Ϥˤ
ŬѤ롣ĹˤϹԤβʸޤޤ롣
.TP
.BR RE_DUP_MAX " - " _SC_RE_DUP_MAX
ɽǶɽ (interval notation)
.B \e{m,n\e}
Ѥ줿Ȥ˵Ƥ뷫֤иκ͡
.TP
.BR POSIX2_VERSION " - " _SC_2_VERSION
POSIX.2 ɸΥСYYYYMML Ȥ񼰤ɽ롣
.TP
.BR POSIX2_C_DEV " - " _SC_2_C_DEV
POSIX.2  C 쳫ȯǽݡȤƤ뤫򼨤
.TP
.BR POSIX2_FORT_DEV " - " _SC_2_FORT_DEV
POSIX.2  FORTRAN ȯ桼ƥƥݡȤƤ뤫򼨤
.TP
.BR POSIX2_FORT_RUN " - " _SC_2_FORT_RUN
POSIX.2  FORTRAN 󥿥桼ƥƥݡȤƤ뤫򼨤
.TP
.BR _POSIX2_LOCALEDEF " - " _SC_2_LOCALEDEF
.BR localedef (1)
ȤäPOSIX.2 Υκ򥵥ݡȤƤ뤫򼨤
.TP
.BR POSIX2_SW_DEV " - " _SC_2_SW_DEV
POSIX.2 եȥȯ桼ƥƥץ󤬥ݡȤƤ뤫򼨤
.PP
ʲͤ¸ߤ뤬ɸˤϴޤޤƤʤ
.TP
.BR "" " - " _SC_PHYS_PAGES
ʪΥڡ
ͤ
.B _SC_PAGE_SIZE
ͤѤϷ줹ǽΤդ뤳ȡ
.TP
.BR "" " - " _SC_AVPHYS_PAGES
ѲǽʪΥڡ
.TP
.BR "" " - " _SC_NPROCESSORS_CONF
ꤵ줿ץå
.TP
.BR "" " - " _SC_NPROCESSORS_ONLN
ߥ饤 (Ѳǽ) ץå
.SH ֤
.I name
ʾ硢\-1 ֤졢
.I errno

.B EINVAL
ꤵ롣
ʳξ硢ƥ꥽֤ͤͤȤ֤졢
.I errno
ѹʤ䤤碌ץˤĤƤǤС
ΥץѤǤȤ֤ͤ졢
ѤǤʤȤ \-1 ֤롣䤤碌
¤ˤĤƾϡ¤ꤵƤʤȤ \-1 ֤롣
.SH 
POSIX.1-2001.
.SH Х
.B ARG_MAX
ȤΤ񤷤ʤʤ顢
.BR exec (3)
ΰΰ (argument space) Τɤ줯餤
桼δĶѿˤäƻȤ뤫ʬʤǤ롣
.PP
Ĥ֤ͤϤȤƤ礭ʤȤä
γƤԤΤŬǤϤʤ
.SH Ϣ
.BR bc (1),
.BR expr (1),
.BR getconf (1),
.BR locale (1),
.BR fpathconf (3),
.BR pathconf (3),
.BR posixoptions (7)