.\" Copyright (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.
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.\" 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.\" manual page may be incorrect or out-of-date.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
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.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\" License.
.\" Modified Wed Jul 21 22:35:42 1993 by Rik Faith (faith@cs.unc.edu)
.\" Modified 18 Mar 1996 by Martin Schulze (joey@infodrom.north.de):
.\"   Corrected description of getwd().
.\" Modified Sat Aug 21 12:32:12 MET 1999 by aeb - applied fix by aj
.\" Modified Mon Dec 11 13:32:51 MET 2000 by aeb
.\" Modified Thu Apr 22 03:49:15 CEST 2002 by Roger Luethi <rl@hellgate.ch>
.\"
.\" Japanese Version Copyright (c) 1997 IMAMURA Nobutaka
.\"         all rights reserved.
.\" Translated Fri Feb 14 12:40:22 JST 1997
.\"         by IMAMURA Nobutaka <imamura@spp.hpc.fujitsu.co.jp>
.\" Modified Thu Dec 8 05:08:44 JST 1999
.\"	    by Kentaro Shirakata <argrath@yo.rim.or.jp>
.\" Modified Sun Mar 12 21:08:44 JST 2000
.\"	    by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated 2001-01-29 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2002-03-23 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2002-10-17 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2007-01-01 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2008-08-21, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.07
.\"
.\" WORD: current working directory	ȥ󥰥ǥ쥯ȥ
.\" WORD: LEGACY	ֲ̾(LEGACY)
.\"
.TH GETCWD 3 2009-03-31 "GNU" "Linux Programmer's Manual"
.SH ̾
getcwd, getwd, get_current_dir_name \- ȥ󥰥ǥ쥯ȥ̾μ
.SH 
.nf
.B #include <unistd.h>
.sp
.BI "char *getcwd(char *" buf ", size_t " size );
.sp
.BI "char *getwd(char *" buf );
.sp
.B "char *get_current_dir_name(void);"
.fi
.sp
.in -4n
glibc εǽޥ׷
.RB ( feature_test_macros (7)
):
.in
.sp
.BR getcwd ():
_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
.br
.BR get_current_dir_name ():
_GNU_SOURCE
.SH 
δؿϡƤӽФץΥȥ󥰥ǥ쥯ȥ
Хѥ̾ (absolute pathname) äʸ֤
֤ʸ NULL ǽü롣
ѥ̾ϴؿη̤Ȥ֤졢
.I buf

.I buf
ͳǤ֤롣

.BR getcwd ()
ؿϥȥ󥰥ǥ쥯ȥХѥ̾
.I buf
Ǽ줿
.I size
Ĺ˥ԡ롣
.PP
ü NULL ХȤޤ᤿ȥ󥰥ǥ쥯ȥ
Хѥ̾Ĺ
.I size
ХȤĶƤϡ֤ͤȤ NULL ֤
.I errno

.B ERANGE
åȤ롣
ץꥱϤΥ顼å
ɬפ˱ƤĹХåեѰդ٤Ǥ롣
.PP
POSIX.1-2001 ɸγĥȤơ
Linux (libc4, libc5, glibc) Ǥ
.I buf
 NULL ξ硢
.BR getcwd ()
ɬפʥХåե
.BR malloc (3)
ѤưŪ˳Ƥ롣
ξ硢
.I size
 0 ξХåեĹ
.I size
Ȥʤ롣
.I size
 0 ξˤɬפ礭ݤ롣
ƤӽФ¦ǡ֤줿Хåե
.BR free (3)
٤Ǥ롣

.BR get_current_dir_name ()
ϥȥ󥰥ǥ쥯ȥХѥ̾Τ
ʬ礭
.BR malloc (3)
dz롣Ķѿ
.B PWD
ꤵƤꤽͤС֤ͤ롣
ƤӽФ¦ǡ֤줿Хåե
.BR free (3)
٤Ǥ롣

.BR getwd ()

.BR malloc (3)
ˤڹԤʤʤ
.I buf
ϾʤȤ
.B PATH_MAX
ХȤĹؤΥݥ󥿤Ǥɬפ롣
ü NULL ХȤޤ᤿ȥ󥰥ǥ쥯ȥ
Хѥ̾Ĺ
.B PATH_MAX
ХȤĶƤ硢
NULL ֤졢
.I errno

.B ENAMETOOLONG
ꤵ롣
(ƥˤäƤϡ
.B PATH_MAX
ɬ⥳ѥ˷ޤǤϤʤդ뤳ȡ
ޤե륷ƥ˰¸⤢롣
.BR pathconf (3)
򻲾ȡ)
ܿȥƥͳ顢
.BR getwd ()
ѤϿ侩ʤ
.SH ֤
ȡδؿϥȥ󥰥ǥ쥯ȥХѥ̾
äʸؤΥݥ󥿤֤
.BR getcwd ()

.BR getwd ()
ξ硢֤ͤ
.I buf
Ʊͤˤʤ롣

Ԥ硢δؿ NULL ֤
.I errno
˥顼򼨤ͤꤹ롣
.I buf
ؤƤ̤Ǥ롣
.SH 顼
.TP
.B EACCES
ե̾ιǤФɤ߹ߤ뤤ϸθ¤ʤ
.TP
.B EFAULT
.I buf
ʥɥ쥹ؤƤ롣
.TP
.B EINVAL
.I size
 0 ġ
.I buf
 NULL ݥ󥿤Ǥʤ
.TP
.B EINVAL
.BR getwd ():
.I buf
 NULL Ǥ롣
.TP
.B ENAMETOOLONG
.BR getwd ():
Хѥ̾ä NULL ü줿ʸĹ
.B PATH_MAX
ХȤĶƤ롣
.TP
.B ENOENT
ȥ󥰥ǥ쥯ȥ꤬Ƥ롣
.TP
.B ERANGE
.I size
ͤ󥰥ǥ쥯ȥХѥ̾Ĺ꾮
ĹˤʸνüХȤޤޤ롣
礭ݤƤ⤦ټ¹Ԥɬפ롣
.SH 
.BR getcwd ()
 POSIX.1-2001 ˽򤷤Ƥ롣
POSIX.1-2001 ϡ
.I buf
 NULL ξ
.BR getcwd ()
ưꤷʤޤޤȤƤ롣

.BR getwd ()
 POSIX.1-2001 ¸ߤƤ뤬ֲ̾(LEGACY)פȤƤ롣
POSIX.1-2008 Ǥϡ
.BR getwd ()
λͤƤ롣

.BR getcwd ()
Ȥȡ
POSIX.1-2001 
.BR getwd ()
˴ؤ륨顼Ƥʤ

.BR get_current_dir_name ()
 GNU ĥǤ롣
.SH 
Linux Ǥ (2.1.92 ʹ)
.BR getcwd ()
ϥƥॳǤ롣
ŤƥǤ
.I /proc/self/cwd
򻲾Ȥ롣
ƥॳ proc ե륷ƥʤ硢
ŪʼƤӽФ롣
ξˤƤΤߡ(Linux Ǥ) δؿ
.B EACCES
ǼԤǽ롣
.LP
δؿϤФХȥ󥰥ǥ쥯ȥΰ֤¸
äƤ뤿Ѥ롣
̤ѤΥեǥץʬϡ
ߤΥǥ쥯ȥ (".") 򳫤
.BR fchdir (2)
ƤӽФ̤ۤϹ®ǿ롣
ä Linux ʳΥץåȥեξϤǤ롣
.SH Ϣ
.BR chdir (2),
.BR fchdir (2),
.BR open (2),
.BR unlink (2),
.BR free (3),
.BR malloc (3)