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.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (C) 1993 Rickard E. Faith <faith@cs.unc.edu>
.\" and Copyright (C) 1994 Andries E. Brouwer <aeb@cwi.nl>
.\" and Copyright (C) 2002, 2005 Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" 2008-10-06, mtk: Created this as a new page by splitting
.\"     umount/umount2 material out of mount.2
.\"
.\" Japanese Version Copyright (c) 2008  Akihiro MOTOKI
.\"         all rights reserved.
.\" Translated 2008-11-20, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.13
.\" 
.TH UMOUNT 2 2009-09-03 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O umount, umount2 \- unmount file system
umount, umount2 \- ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ò¥¢¥ó¥Þ¥¦¥ó¥È¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B "#include <sys/mount.h>"
.sp
.BI "int umount(const char *" target );
.sp
.BI "int umount2(const char *" target ", int " flags );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O .BR umount ()
.\"O and
.\"O .BR umount2 ()
.\"O remove the attachment of the (topmost) file system mounted on
.\"O .IR target .
.BR umount ()
¤È
.BR umount2 ()
¤Ï
.I target
¤Ë¥Þ¥¦¥ó¥È¤µ¤ì¤Æ¤¤¤ë (ºÇ¾å°Ì¤Î) ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ò³°¤¹¡£
.\" Note: the kernel naming differs from the glibc naming
.\" umount2 is the glibc name for what the kernel now calls umount
.\" and umount is the glibc name for oldumount

.\"O Appropriate privilege (Linux: the
.\"O .B CAP_SYS_ADMIN
.\"O capability) is required to unmount file systems.
¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Î¥¢¥ó¥Þ¥¦¥ó¥È¤ò¹Ô¤¦¤Ë¤Ï¡¢
ŬÀڤʸ¢¸Â (Linux ¤Ç¤Ï
.B CAP_SYS_ADMIN
¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£) ¤¬É¬ÍפǤ¢¤ë¡£

.\"O Linux 2.1.116 added the
.\"O .BR umount2 ()
.\"O system call, which, like
.\"O .BR umount (),
.\"O unmounts a target, but allows additional
.\"O .I flags
.\"O controlling the behavior of the operation:
Linux 2.1.116 ¤«¤é¡¢
.BR umount2 ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬Äɲ䵤줿¡£¤³¤ì¤Ï
.BR umount ()
¤ÈƱÍͤË
.I target
¤ò¥¢¥ó¥Þ¥¦¥ó¥È¤¹¤ë¤¬¡¢
.I flags
¤¬Äɲ䵤ì¤Æ¤ª¤ê¡¢Áàºî»þ¤Î¿¶¤ëÉñ¤¤¤òÀ©¸æ¤Ç¤­¤ë¡£
.TP
.\"O .BR MNT_FORCE " (since Linux 2.1.116)"
.BR MNT_FORCE " (2.1.116 °Ê¹ß)"
.\"O Force unmount even if busy.
.\"O This can cause data loss.
.\"O (Only for NFS mounts.)
»ÈÍÑÃæ (busy) ¤Ç¤â¶¯À©Åª¤Ë¥¢¥ó¥Þ¥¦¥ó¥È¤ò¼Â¹Ô¤¹¤ë¡£
¤³¤ì¤ò¹Ô¤¦¤È¥Ç¡¼¥¿¤ò¼º¤¦²ÄǽÀ­¤¬¤¢¤ë¡£
(NFS ¥Þ¥¦¥ó¥ÈÀìÍÑ)
.TP
.\"O .BR MNT_DETACH " (since Linux 2.4.11)"
.BR MNT_DETACH " (2.4.11 °Ê¹ß)"
.\"O Perform a lazy unmount: make the mount point unavailable for
.\"O new accesses, and actually perform the unmount when the mount point
.\"O ceases to be busy.
Ãٱ䥢¥ó¥Þ¥¦¥ó¥È¤ò¹Ô¤¦¡£¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤ËÂФ¹¤ë¿·µ¬¤Î¥¢¥¯¥»¥¹¤Ï
ÉÔ²Äǽ¤È¤Ê¤ê¡¢¼ÂºÝ¤Î¥¢¥ó¥Þ¥¦¥ó¥È¤Ï¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤¬¥Ó¥¸¡¼¤Ç
¤Ê¤¯¤Ê¤Ã¤¿»þÅÀ¤Ç¹Ô¤¦¡£
.TP
.\"O .BR MNT_EXPIRE " (since Linux 2.6.8)"
.BR MNT_EXPIRE " (Linux 2.6.8 °Ê¹ß)"
.\"O Mark the mount point as expired.
¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤Ë´ü¸ÂÀÚ¤ì¤Î°õ¤ò¤Ä¤±¤ë¡£
.\"O If a mount point is not currently in use, then an initial call to
.\"O .BR umount2 ()
.\"O with this flag fails with the error
.\"O .BR EAGAIN ,
.\"O but marks the mount point as expired.
¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤¬¸½ºß»ÈÍÑÃæ¤Ç¤Ê¤¤¾ì¹ç¡¢¤³¤Î¥Õ¥é¥°¤ò¤Ä¤±¤Æ
.BR umount2 ()
¤ò½é¤á¤Æ¸Æ¤Ó½Ð¤¹¤È
.B EAGAIN
¥¨¥é¡¼¤Ç¼ºÇÔ¤¹¤ë¤¬¡¢¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤Ë¤Ï´ü¸ÂÀÚ¤ì (expire)
¤Î°õ¤¬¤Ä¤±¤é¤ì¤ë¡£
.\"O The mount point remains expired as long as it isn't accessed
.\"O by any process.
¤½¤Î¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤Ï¤¤¤º¤ì¤«¤Î¥×¥í¥»¥¹¤¬¥¢¥¯¥»¥¹¤·¤Ê¤¤¸Â¤ê
´ü¸ÂÀÚ¤ì¤Î°õ¤¬¤Ä¤¤¤¿¤Þ¤Þ¤È¤Ê¤ë¡£
.\"O A second
.\"O .BR umount2 ()
.\"O call specifying
.\"O .B MNT_EXPIRE
.\"O unmounts an expired mount point.
¤â¤¦°ìÅÙ
.B MNT_EXPIRE
¤ò¤Ä¤±¤Æ
.BR umount2 ()
¤ò¸Æ¤Ó½Ð¤¹¤È¡¢´ü¸ÂÀÚ¤ì¤Î°õ¤Î¤Ä¤¤¤¿¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤¬
¥¢¥ó¥Þ¥¦¥ó¥È¤µ¤ì¤ë¡£
.\"O This flag cannot be specified with either
.\"O .B MNT_FORCE
.\"O or
.\"O .BR MNT_DETACH .
¤³¤Î¥Õ¥é¥°¤ò
.B MNT_FORCE
¤â¤·¤¯¤Ï
.B MNT_DETACH
¤ÈƱ»þ¤Ë»ØÄꤹ¤ë¤³¤È¤Ï¤Ç¤­¤Ê¤¤¡£
.\"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 ¤¬Ê֤롣
¥¨¥é¡¼¤Î¾ì¹ç¡¢\-1 ¤¬Ê֤ꡢ
.I errno
¤¬¥¨¥é¡¼¤ÎÆâÍƤˤ·¤¿¤¬¤Ã¤ÆÀßÄꤵ¤ì¤ë¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.\"O The error values given below result from filesystem type independent
.\"O errors.
.\"O Each filesystem type may have its own special errors and its
.\"O own special behavior.
.\"O See the kernel source code for details.
°Ê²¼¤Ë¼¨¤¹¥¨¥é¡¼¤Ï¡¢¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ë°Í¸¤·¤Ê¤¤¤â¤Î¤Ç¤¢¤ë¡£
¤½¤ì¤¾¤ì¤Î¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¥¿¥¤¥×¤Ë¤Ï¸ÇÍ­¤Î¥¨¥é¡¼¤¬Â¸ºß¤¹¤ë¾ì¹ç¤¬¤¢¤ê¡¢
Æȼ«¤ÎÆ°ºî¤ò¤¹¤ë¤³¤È¤â¤¢¤ë¡£¾Ü¤·¤¯¤Ï¥«¡¼¥Í¥ë¤Î¥½¡¼¥¹¤ò¸«¤ÆÍߤ·¤¤¡£
.TP
.B EAGAIN
.\"O A call to
.\"O .BR umount2 ()
.\"O specifying
.\"O .B MNT_EXPIRE
.\"O successfully marked an unbusy file system as expired.
.B MNT_EXPIRE
¤ò»ØÄꤷ¤¿
.BR umount2 ()
¤Î¸Æ¤Ó½Ð¤·¤Ç¡¢Àµ¾ï¤Ë̤»ÈÍѤΥե¡¥¤¥ë¥·¥¹¥Æ¥à¤Ë´ü¸ÂÀÚ¤ì¤Î°õ¤ò
¤Ä¤±¤ë¤³¤È¤¬¤Ç¤­¤¿¡£
.TP
.B EBUSY
.\"O .I target
.\"O could not be unmounted because it is busy.
»ÈÍÑÃæ (busy) ¤Î¤¿¤á¡¢
.I target
¤ò¥¢¥ó¥Þ¥¦¥ó¥È¤Ç¤­¤Ê¤«¤Ã¤¿¡£
.TP
.B EFAULT
.\"O .I target
.\"O points outside the user address space.
.I target
¤¬¥æ¡¼¥¶¥¢¥É¥ì¥¹¶õ´Ö¤Î³°¤ò»Ø¤·¤Æ¤¤¤ë¡£
.TP
.B EINVAL
.\"O .I target
.\"O is not a mount point.
.\"O Or,
.\"O .BR umount2 ()
.\"O was called with
.\"O .B MNT_EXPIRE
.\"O and either
.\"O .B MNT_DETACH
.\"O or
.\"O .BR MNT_FORCE .
.I target
¤¬¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤Ç¤Ï¤Ê¤¤¡£
¤Þ¤¿¤Ï¡¢
.BR umount2 ()
¤Ç¡¢
.B MNT_EXPIRE
¤¬»ØÄꤵ¤ì¤¿
.BR umount2 ()
¤Ç¡¢
.B MNT_DETACH
¤«
.B MNT_FORCE
¤¬Æ±»þ¤Ë»ØÄꤵ¤ì¤¿¡£
.TP
.B ENAMETOOLONG
.\"O A pathname was longer than
.\"O .BR MAXPATHLEN .
¥Ñ¥¹Ì¾¤ÎŤµ¤¬
.B MAXPATHLEN
¤è¤êŤ«¤Ã¤¿¡£
.TP
.B ENOENT
.\"O A pathname was empty or had a nonexistent component.
¥Ñ¥¹Ì¾¤¬¶õ¤Ç¤¢¤ë¡£¤â¤·¤¯¤Ï»ØÄꤵ¤ì¤¿¥Ñ¥¹¤¬Â¸ºß¤·¤Ê¤¤¡£
.TP
.B ENOMEM
.\"O The kernel could not allocate a free page to copy filenames or data into.
¥«¡¼¥Í¥ë¤¬¥Õ¥¡¥¤¥ë̾¤ä¥Ç¡¼¥¿¤ò¥³¥Ô¡¼¤¹¤ë¤¿¤á¤Î¶õ¤­¥Ú¡¼¥¸¤ò³ÎÊݤǤ­¤Ê¤«¤Ã¤¿¡£
.TP
.B EPERM
.\"O The caller does not have the required privileges.
¸Æ¤Ó½Ð¤·¸µ¤¬É¬Íפʸ¢¸Â¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤¡£
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O .BR MNT_DETACH
.\"O and
.\"O .BR MNT_EXPIRE
.\" http://sourceware.org/bugzilla/show_bug.cgi?id=10092
.\"O are only available in glibc since version 2.11.
.BR MNT_DETACH
¤È
.BR MNT_EXPIRE
¤Ï¥Ð¡¼¥¸¥ç¥ó 2.11 °Ê¹ß¤Î glibc ¤Ç¤Î¤ßÍøÍѤǤ­¤ë¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O These functions are Linux-specific and should not be used in
.\"O programs intended to be portable.
¤³¤Î´Ø¿ô¤Ï Linux ¸ÇÍ­¤Î´Ø¿ô¤Ç¤¢¤ê¡¢°Ü¿¢¤ò¹Íθ¤·¤¿¥×¥í¥°¥é¥à¤Ç¤Ï
»ÈÍѤ¹¤Ù¤­¤Ç¤Ê¤¤¡£
.\"O .SH NOTES
.SH Ãí°Õ
.\"O The original
.\"O .BR umount ()
.\"O function was called as \fIumount(device)\fP and would return
.\"O .B ENOTBLK
.\"O when called with something other than a block device.
¸µ¡¹¤Î
.BR umount ()
´Ø¿ô¤Ï \fIumount(device)\fP ¤Î·Á¤Ç¸Æ¤Ó½Ð¤µ¤ì¡¢
¥Ö¥í¥Ã¥¯¥Ç¥Ð¥¤¥¹°Ê³°¤ò»ØÄꤷ¤Æ¸Æ¤Ó½Ð¤¹¤È
.B ENOTBLK
¤òÊÖ¤·¤¿¡£
.\"O In Linux 0.98p4 a call \fIumount(dir)\fP was added, in order to
.\"O support anonymous devices.
Linux 0.98p4 ¤Ç¡¢ÌµÌ¾¥Ç¥Ð¥¤¥¹ (anonymous device) ¤ËÂбþ¤¹¤ë¤¿¤á¤Ë
\fIumount(dir)\fP ¤Î·Á¤Ç¤Î¸Æ¤Ó½Ð¤·¤¬²Ã¤¨¤é¤ì¤¿¡£
.\"O In Linux 2.3.99-pre7 the call \fIumount(device)\fP was removed,
.\"O leaving only \fIumount(dir)\fP (since now devices can be mounted
.\"O in more than one place, so specifying the device does not suffice).
Linux 2.3.99-pre7 ¤Ç¡¢\fIumount(device)\fP ¤Ïºï½ü¤µ¤ì¡¢
\fIumount(dir)\fP ¤À¤±¤¬»Ä¤µ¤ì¤¿
(°ì¤Ä¤Î¥Ç¥Ð¥¤¥¹¤òÊ£¿ô¤Î°ÌÃ֤˥ޥ¦¥ó¥È½ÐÍè¤ë¤è¤¦¤Ë¤Ê¤Ã¤¿¤¿¤á¡¢
¥Ç¥Ð¥¤¥¹¤ò»ØÄꤷ¤¿¤À¤±¤Ç¤ÏÉÔ½½Ê¬¤À¤«¤é¤Ç¤¢¤ë)¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR mount (2),
.BR path_resolution (7),
.BR mount (8),
.BR umount (8)