.\" (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.\" manual page may be incorrect or out-of-date.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 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 Mon Jan 29 JST 2001 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated Sat Mar 23 JST 2002 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated Sat Oct 17 JST 2002 by Kentaro Shirakata <argrath@ub32.org>
.\"
.\" WORD: current working directory	ȥ󥰥ǥ쥯ȥ
.\"
.TH GETCWD 3 2002-04-22 "GNU" "Linux Programmer's Manual"
.SH ̾
getcwd, get_current_dir_name, getwd \- ȥ󥰥ǥ쥯ȥ̾μ
.SH 
.nf
.B #include <unistd.h>
.sp
.BI "char *getcwd(char *" buf ", size_t " size );
.B "char *get_current_dir_name(void);"
.BI "char *getwd(char *" buf );
.fi
.SH 
.BR getcwd ()
ؿϥȥ󥰥ǥ쥯ȥХѥ̾(absolute pathname)
.I buf
Ǽ줿
.I size
Ĺ˥ԡ롣
.PP
Хѥ̾(current absolute path name)
.I size
Ĺϡ֤ͤȤ
.B NULL
֤
.I errno

.BR ERANGE
åȤ롣
ץꥱϤΥ顼å
ɬפ˱ƤĹХåեѰդ٤Ǥ롣
.PP
.PP
.I buf
 NULL ξ硢
.BR getcwd ()
ư̤Ǥ롣
POSIX.1 ɸγĥȤơ
Linux (libc4, libc5, glibc)ǤϸƤӤ
.I buf

.B NULL
Ϳ뤳Ȥ
.BR getcwd ()
ɬפʥХåե
.BR malloc ()
ѤưŪ˳褦ˤǤ롣
ξ硢
.I size
 0 ξХåեĹ
.I size
Ȥʤ롣
.I size
 0 ξˤɬפ礭ݤ롣
ˡdzХåե
.BR free ()
Dz뤳ȤǽǤ(Τ)
.PP
.B _GNU_SOURCE
 define ƤС 
.B get_current_dir_name
ؿץȥ롣δؿϥȥǥ쥯ȥ̾
Τ˽ʬ礭
.BR malloc (3)
dz롣Ķѿ
.B PWD
ꤵƤꤽͤС֤ͤ롣
.PP
.B _BSD_SOURCE
ޤ
.B _XOPEN_SOURCE_EXTENDED
defineƤ
.B getwd
ؿץȥ롣
δؿ
.BR malloc (3)
ˤڹԤʤʤ
.I buf
ϾʤȤ
.B PATH_MAX
ХȤĹؤΥݥ󥿤Ǥɬפ롣
.BR getwd
ϼºݤΥѥ̾Ƭ
.B PATH_MAX
ХȤ֤
.B PATH_MAX
ϥѥǤɬפϤʤȤդ뤳ȡ
ϥե륷ƥ˰¸̵¤Ǥǽ餢롣
ܿȥƥͳ顢
.B getwd
ѤϿ侩ʤ
.SH ֤
顼ȯ
.B NULL
֤
.I errno
顼˽äƥåȤ롣

.I buf
֤
顼ξ
.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 ENOENT
ȥ󥰥ǥ쥯ȥ꤬Ƥ롣
.TP
.B ERANGE
.I size
ͤ󥰥ǥ쥯ȥ̾Ĺ꾮
礭ݤƤ⤦ټ¹Ԥɬפ롣
.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
ʬʥեǥץϡ
ߤΥǥ쥯ȥ (".") 򳫤
.BR fchdir (2)
ƤӽФ̤ۤϹ®ǿ롣
ä Linux ʳΥץåȥեξϤǤ롣
.SH 
POSIX.1
.SH Ϣ
.BR chdir (2),
.BR fchdir (2),
.BR open (2),
.BR unlink (2),
.BR free (3),
.BR malloc (3)