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.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 1993 Michael Haardt
.\" (michael@moria.de),
.\" Fri Apr 2 11:32:09 MET DST 1993
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, write to the Free
.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
.\" USA.
.\"
.\" Modified Wed Jul 21 19:52:58 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified Sun Aug 21 17:40:38 1994 by Rik Faith <faith@cs.unc.edu>
.\"
.\" Japanese Version Copyright (c) 1996 TABATA Tomohira
.\" all rights reserved.
.\" Translated Wed Jun 26 19:12:54 JST 1996
.\" by TABATA Tomohira <loba@k2.t.u-tokyo.ac.jp>
.\" Modified Sat Dec 13 23:43:56 JST 1997
.\" by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated & Modified Wed May 19 01:55:29 JST 2004
.\" by Yuichi SATO <ysato444@yahoo.co.jp>, LDP v1.66
.\" Updated & Modified Tue Jan 2 09:09:47 JST 2007 by Yuichi SATO, LDP v2.43
.\"
.TH BRK 2 2007-07-26 "Linux" "Linux Programmer's Manual"
.SH ̾
brk, sbrk \- ǡȤΥѹ
.SH
.B #include <unistd.h>
.sp
.BI "int brk(void *" end_data_segment );
.sp
.BI "void *sbrk(intptr_t " increment );
.sp
.in -4n
glibc εǽޥ
.RB ( feature_test_macros (7)
):
.in
.sp
.ad l
.BR brk (),
.BR sbrk ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500
.ad b
.SH
.BR brk ()
ϡǡ (data segment) κǸ
.I end_data_segment
ǻꤷͤꤹ롣
ƥबʬʥ
ץΥǡκͤĶƤʤСͤͭǤ롣
.RB ( setrlimit (2)
)
.BR sbrk ()
ϡץΥǡ֤
.I increment
ХȤ䤹
.BR sbrk ()
ϡƥࡦǤϤʤC 饤֥ˤåѡ (wrapper) Ǥ롣
increment 0 ˤ
.BR sbrk ()
ƤӽФȤǡץθߤΥ֥졼 (break) Τ뤳ȤǤ롣
.SH ֤
硢
.BR brk ()
0 ֤
顼ξˤϡ\-1 ֤
.I errno
.B ENOMEM
ꤹ
(LINUX ǤաפȤ뤳)
硢
.BR sbrk ()
ϿΰƬؤΥݥ֤
顼ξˤϡ
\-1 ֤
.I errno
.B ENOMEM
ꤹ롣
.SH
4.3BSD, SUSv1.
SUSv2 Ǥϡֲ̾ (LEGACY)פȰդƤꡢ
POSIX.1-2001 Ǻ줿
.BR brk ()
.BR sbrk ()
C (C Standard) ˤƤʤ
ޤ POSIX.1 ʤϰտŪ˽Ƥ ( B.1.1.1.3, B.8.3.3 )
.SH
ʥƥˤơ
.BR sbrk ()
ΰ͡ʷȤƤ롣
ŪʤΤ \fIint\fP, \fIssize_t\fP, \fIptrdiff_t\fP, \fIintptr_t\fP Ǥ롣
.\" \fIint\fP (Ȥ XPGv4, DU 4.0, HP-UX 11, FreeBSD 4.0, OpenBSD 3.2),
.\" \fIssize_t\fP (OSF1 2.0, Irix 5.3, 6.5),
.\" \fIptrdiff_t\fP (libc4, libc5, ulibc, glibc 2.0, 2.1),
.\" \fIintptr_t\fP (Ȥ XPGv5, AIX, SunOS 5.8, 5.9, FreeBSD 4.7,
.\" NetBSD 1.6, Tru64 5.1, glibc2.2).
.\" ȤΤʬ
.SS Linux Ǥ
.BR brk ()
֤ͤˤĤƤưϡ
Linux
.BR brk ()
ƥॳåפ glibc δؿˤΤǤ롣
(¾¿μǤ⡢
.BR brk ()
֤ͤϤƱǤ롣)
ºݤ Linux ƥॳϡ硢
ץο֥졼֤
Ԥ硢ΥƥॳϸߤΥ֥졼֤
(äơ
.I brk(0)
ȤƤӽФǸߤΥ֥졼Ǥ)
glibc åѡؿƱͤƯ
0 \-1 Ȥ֤֤ͤ
Linux Ǥ
.BR sbrk ()
.BR brk ()
ƥॳȤ饤֥ؿȤƼƤꡢ
Υ֥졼֤ͤȤǤ褦ĴԤƤ롣
.SH Ϣ
.BR execve (2),
.BR getrlimit (2),
.BR malloc (3)
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