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.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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 by Michael Haardt <michael@moria.de>
.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
.\" Modified 1995-06-10 by Andries Brouwer <aeb@cwi.nl>
.\" Modified 2004-06-23 by Michael Kerrisk <mtk.manpages@gmail.com>
.\" Modified 2004-10-10 by Andries Brouwer <aeb@cwi.nl>
.\"
.\" Japanese Version Copyright (c) 1997 SUTO, Mitsuaki
.\"         all rights reserved.
.\" Translated Thu Jun 26 21:28:00 JST 1997
.\"         by SUTO, Mitsuaki <suto@av.crl.sony.co.jp>
.\" Updated & Modified Tue Feb 15 03:21:17 JST 2005
.\"         by Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated 2006-07-21, Akihiro MOTOKI, LDP v2.36
.\" Updated 2007-10-13, Akihiro MOTOKI, LDP v2.65
.\" Updated 2008-08-08, Akihiro MOTOKI, LDP v3.05
.\"
.TH UTIME 2 2008-08-06 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O utime, utimes \- change file last access and modification times
utime, utimes \- ¥Õ¥¡¥¤¥ë¤ÎºÇ½ª¥¢¥¯¥»¥¹»þ¹ï¤È½¤Àµ»þ¹ï¤òÊѹ¹¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B #include <sys/types.h>
.br
.B #include <utime.h>
.sp
.BI "int utime(const char *" filename ", const struct utimbuf *" times );
.sp
.B #include <sys/time.h>
.sp
.BI "int utimes(const char *" filename ", const struct timeval " times [2]);
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O The
.\"O .BR utime ()
.\"O system call
.\"O changes the access and modification times of the inode specified by
.\"O .I filename
.\"O to the
.\"O .IR actime " and " modtime
.\"O fields of
.\"O .I times
.\"O respectively.
.BR utime ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï
.I filename
¤Ç¼¨¤µ¤ì¤ë inode ¤Î¥¢¥¯¥»¥¹»þ¹ï¤È½¤Àµ»þ¹ï¤ò
.I times
Ãæ¤Î
.IR actime " ¤È " modtime
¤Ë¤½¤ì¤¾¤ìÊѹ¹¤¹¤ë¡£

.\"O If
.\"O .I times
.\"O is NULL, then the access and modification times of the file are set
.\"O to the current time.
.I times
¤¬
.B NULL
¤Î¾ì¹ç¡¢¥Õ¥¡¥¤¥ë¤Î¥¢¥¯¥»¥¹»þ¹ï¤È½¤Àµ»þ¹ï¤Ï¸½ºß¤Î»þ¹ï¤ËÀßÄꤵ¤ì¤ë¡£

.\"O Changing timestamps is permitted when: either
.\"O the process has appropriate privileges,
.\"O or the effective user ID equals the user ID
.\"O of the file, or
.\"O .I times
.\"O is NULL and the process has write permission for the file.
¥¿¥¤¥à¥¹¥¿¥ó¥×¤ÎÊѹ¹¤Ï°Ê²¼¤Î¤¤¤º¤ì¤«¤Î¾ì¹ç¤Ëµö²Ä¤µ¤ì¤ë¡£
¥×¥í¥»¥¹¤ËŬÀÚ¤ÊÆø¢¤¬¤¢¤ë¾ì¹ç¡¢
¼Â¸ú (effective) ¥æ¡¼¥¶ ID ¤¬¥Õ¥¡¥¤¥ë¤Î¥æ¡¼¥¶ ID ¤ÈÅù¤·¤¤¾ì¹ç¡¢
.I times
¤¬ NULL ¤«¤Ä¡¢¥×¥í¥»¥¹¤¬¥Õ¥¡¥¤¥ë¤Ø¤Î½ñ¤­¹þ¤ßµö²Ä¤ò»ý¤Ã¤Æ¤¤¤ë¾ì¹ç¡£

.\"O The
.\"O .I utimbuf
.\"O structure is:
¹½Â¤ÂÎ
.I utimbuf
¤Ï°Ê²¼¤Ë¼¨¤¹¤è¤¦¤Ë¤Ê¤Ã¤Æ¤¤¤ë¡£

.in +4n
.nf
struct utimbuf {
.\"O     time_t actime;       /* access time */
.\"O     time_t modtime;      /* modification time */
    time_t actime;       /* ¥¢¥¯¥»¥¹»þ¹ï */
    time_t modtime;      /* ½¤Àµ»þ¹ï */
};
.fi
.in

.\"O The
.\"O .BR utime ()
.\"O system call
.\"O allows specification of timestamps with a resolution of 1 second.
.BR utime ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï 1 ÉäÎʬ²òǽ¤Ç¥¿¥¤¥à¥¹¥¿¥ó¥×¤ò»ØÄꤹ¤ë¤³¤È¤¬¤Ç¤­¤ë¡£

.\"O The
.\"O .BR utimes ()
.\"O system call
.\"O is similar, but the
.\"O .I times
.\"O argument refers to an array rather than a structure.
.\"O The elements of this array are
.\"O .I timeval
.\"O structures, which allow a precision of 1 microsecond for specifying timestamps.
.BR utimes ()
¤Ï
.BR utime ()
¤ÈƱÍͤǤ¢¤ë¤¬¡¢
.I times
°ú¤­¿ô¤¬¹½Â¤ÂΤǤϤʤ¯ÇÛÎó¤ò»²¾È¤¹¤ë¡£
¤³¤ÎÇÛÎó¤ÎÍ×ÁǤÏ
.I timeval
¹½Â¤ÂΤǡ¢¥¿¥¤¥à¥¹¥¿¥ó¥×¤Î»ØÄê¤ò 1 ¥Þ¥¤¥¯¥íÉäÎʬ²òǽ¤Ç¹Ô¤¦¤³¤È¤¬¤Ç¤­¤ë¡£
.\"O The
.\"O .I timeval
.\"O structure is:
¹½Â¤ÂÎ
.I timeval
¤Ï°Ê²¼¤Ë¼¨¤¹Ä̤ê¤Ç¤¢¤ë¡£

.in +4n
.nf
struct timeval {
.\"O     long tv_sec;        /* seconds */
    long tv_sec;        /* ÉÃ */
.\"O     long tv_usec;       /* microseconds */
    long tv_usec;       /* ¥Þ¥¤¥¯¥íÉà */
};
.fi
.in
.PP
.\"O .IR times [0]
.\"O specifies the new access time, and
.\"O .IR times [1]
.\"O specifies the new modification time.
.IR times [0]
¤Ï¿·¤·¤¤¥¢¥¯¥»¥¹»þ¹ï¤ò¡¢
.IR times [1]
¤Ï¿·¤·¤¤½¤Àµ»þ¹ï¤òµ¬Äꤹ¤ë¡£
.\"O If
.\"O .I times
.\"O is NULL, then analogously to
.\"O .BR utime (),
.\"O the access and modification times of the file are
.\"O set to the current time.
.I times
¤¬ NULL ¤Î¾ì¹ç¡¢
.BR utime ()
ƱÍÍ¡¢¥Õ¥¡¥¤¥ë¤Î¥¢¥¯¥»¥¹»þ¹ï¤È½¤Àµ»þ¹ï¤Ï¸½ºß¤Î»þ¹ï¤ËÀßÄꤵ¤ì¤ë¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On success, zero is returned.
.\"O On error, \-1 is returned, and
.\"O .I errno
.\"O is set appropriately.
À®¸ù¤·¤¿¾ì¹ç 0 ¤¬Ê֤롣¼ºÇÔ¤·¤¿¾ì¹ç \-1 ¤¬Ê֤ꡢ
.I errno
¤¬¥¨¥é¡¼¤ÎÆâÍƤ˽¾¤Ã¤ÆÀßÄꤵ¤ì¤ë¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.TP
.B EACCES
.\"O Search permission is denied for one of the directories in
.\"O the path prefix of
.\"O .I path
.\"O (see also
.\"O .BR path_resolution (7)).
.I path
¤ò¹½À®¤¹¤ë²¿¤ì¤«¤Î¥Ç¥£¥ì¥¯¥È¥ê¤Ë¸¡º÷µö²Ä¤¬¤Ê¤¤
.RB ( path_resolution (7)
¤â»²¾È¤¹¤ë¤³¤È)¡£
.TP
.B EACCES
.\"O .I times
.\"O is NULL,
.\"O the caller's effective user ID does not match the owner of the file,
.\"O the caller does not have write access to the file,
.\"O and the caller is not privileged
.\"O (Linux: does not have either the
.\"O .B CAP_DAC_OVERRIDE
.\"O or the
.\"O .B CAP_FOWNER
.\"O capability).
.I times
¤¬ NULL ¤Ç¤¢¤ë¡£
¤Þ¤¿¤Ï¡¢¸Æ¤Ó½Ð¤·¸µ¤Î¼Â¸ú¥æ¡¼¥¶ ID ¤¬¥Õ¥¡¥¤¥ë¤Î½êÍ­¼Ô¤È°ìÃפ·¤Ê¤¤¡£
¤Þ¤¿¤Ï¡¢¸Æ¤Ó½Ð¤·¸µ¤¬¤½¤Î¥Õ¥¡¥¤¥ë¤Ø¤Î½ñ¤­¹þ¤ßµö²Ä¤ò»ý¤¿¤º¡¢
Æø¢¤â»ý¤Ã¤Æ¤¤¤Ê¤¤ (Linux ¤Î¾ì¹ç¡¢¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£
.B CAP_DAC_OVERRIDE
¤â
.B CAP_FOWNER
¤â»ý¤Ã¤Æ¤¤¤Ê¤¤)¡£¤Þ¤¿¤Ï¡¢
.TP
.B ENOENT
.\"O .I filename
.\"O does not exist.
.I filename
¤¬Â¸ºß¤·¤Ê¤¤¡£
.TP
.B EPERM
.\"O .I times
.\"O is not NULL,
.\"O the caller's effective UID does not match the owner of the file,
.\"O and the caller is not privileged
.\"O (Linux: does not have the
.\"O .B CAP_FOWNER
.\"O capability).
.I times
¤¬ NULL ¤Ç¤Ê¤¯¡¢¤«¤Ä¸Æ¤Ó½Ð¤·¸µ¤Î¼Â¸ú UID ¤¬¥Õ¥¡¥¤¥ë¤Î½êÍ­¼Ô¤È°ìÃפ»¤º¡¢
¤«¤Ä¸Æ¤Ó½Ð¤·¸µ¤¬Æø¢¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤
(Linux ¤Î¾ì¹ç¡¢¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£
.B CAP_FOWNER
¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤)¡£
.TP
.B EROFS
.\"O .I path
.\"O resides on a read-only file system.
.I path
¤¬Æɤ߹þ¤ßÀìÍѤΥե¡¥¤¥ë¥·¥¹¥Æ¥à¾å¤Ë¤¢¤ë¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.BR utime ():
SVr4, POSIX.1-2001.
.\"O POSIX.1-2008 marks
.\"O .BR utime ()
.\"O as obsolete.
POSIX.1-2008 ¤Ï
.BR utime ()
¤òÇÑ»ßͽÄê¤È¤·¤Æ¤¤¤ë¡£
.br
.BR utimes ():
4.3BSD, POSIX.1-2001.
.\"O .SH NOTES
.SH Ãí°Õ
.\"O Linux does not allow changing the timestamps on an immutable file,
.\"O or setting the timestamps to something other than the current time
.\"O on an append-only file.
Linux ¤Ç¤Ï¡¢ÉÔÊÑ (immutable) ¥Õ¥¡¥¤¥ë¤Î¥¿¥¤¥à¥¹¥¿¥ó¥×¤òÊѹ¹¤·¤¿¤ê¡¢
ÄɲÃÀìÍÑ (append-only) ¤Î¥Õ¥¡¥¤¥ë¤Ë¸½ºß»þ¹ï°Ê³°¤Î¥¿¥¤¥à¥¹¥¿¥ó¥×¤ò
ÀßÄꤷ¤¿¤ê¤¹¤ë¤³¤È¤Ï¡¢µö²Ä¤µ¤ì¤Æ¤¤¤Ê¤¤¡£

.\"O In libc4 and libc5,
.\"O .BR utimes ()
.\"O is just a wrapper for
.\"O .BR utime ()
.\"O and hence does not allow a subsecond resolution.
libc4 ¤È libc5 ¤Ç¤Ï¡¢
.BR utimes ()
¤Ïñ¤Ë
.BR utime ()
¤Î¥é¥Ã¥Ñ¡¼ (wrapper) ¤Ç¤¢¤ë¡£
¤½¤Î¤¿¤áÉðʲ¼¤ò»ØÄꤹ¤ë¤³¤È¤Ï¤Ç¤­¤Ê¤¤¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR chattr (1),
.BR futimesat (2),
.BR stat (2),
.BR utimensat (2),
.BR futimes (3),
.BR futimens (3)