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[linuxjm/LDP_man-pages.git] / draft / man3 / shm_open.3

.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (C) 2002 Michael Kerrisk <mtk.manpages@gmail.com>
.\"
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.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" FIXME . Add an example to this page
.\"
.\" Japanese Version Copyright (c) 2002 Akihiro MOTOKI, all rights reserved.
.\" Translated Mon Feb  2 2003 by Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2009-02-23, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.19
.\"
.TH SHM_OPEN 3 2009-02-25 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O shm_open, shm_unlink \- Create/open or unlink POSIX shared memory objects
shm_open, shm_unlink \- POSIX ¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤ÎºîÀ®/¥ª¡¼¥×¥ó¡¢
ºï½ü¤ò¹Ô¤¦
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.B #include <sys/mman.h>
.br
.\"O .BR "#include <sys/stat.h>" "        /* For mode constants */"
.BR "#include <sys/stat.h>" "        /* mode Äê¿ôÍÑ */"
.br
.\"O .BR "#include <fcntl.h>" "           /* For O_* constants */"
.BR "#include <fcntl.h>" "           /* O_* Äê¿ô¤ÎÄêµÁÍÑ */"
.sp
.BI "void * shm_open(const char *" name ", int " oflag ", mode_t " mode );
.sp
.BI "int shm_unlink(const char *" name );
.sp
.\"O Link with \fI\-lrt\fP.
\fI\-lrt\fP ¤Ç¥ê¥ó¥¯¤¹¤ë¡£
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O .BR shm_open ()
.\"O creates and opens a new, or opens an existing, POSIX shared memory object.
.\"O A POSIX shared memory object is in effect a handle which can
.\"O be used by unrelated processes to
.\"O .BR mmap (2)
.\"O the same region of shared memory.
.BR shm_open ()
¤Ï¡¢POSIX ¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤ò¿·µ¬¤ËºîÀ®/¥ª¡¼¥×¥ó¤·¤¿¤ê¡¢
¤¹¤Ç¤Ë¸ºß¤¹¤ë¥ª¥Ö¥¸¥§¥¯¥È¤ò¥ª¡¼¥×¥ó¤·¤¿¤ê¤¹¤ë¡£
POSIX ¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤Ï¡¢¼ÂºÝ¤Ë¤Ï¡¢´Ø·¸¤Î¤Ê¤¤¥×¥í¥»¥¹¤¬
¶¦Í­¥á¥â¥ê¤ÎƱ¤¸Îΰè¤ò
.BR mmap (2)
¤¹¤ë¤¿¤á¤Ë»ÈÍѤ¹¤ë¤³¤È¤¬¤Ç¤­¤ë¼êÃʤǤ¢¤ë¡£
.\"O The
.\"O .BR shm_unlink ()
.\"O function performs the converse operation,
.\"O removing an object previously created by
.\"O .BR shm_open ().
.BR shm_unlink ()
¤Ï¡¢µÕ¤ÎÁàºî¡¢¤Ä¤Þ¤ê°ÊÁ°¤Ë
.BR shm_open ()
¤ÇºîÀ®¤µ¤ì¤¿¥ª¥Ö¥¸¥§¥¯¥È¤Îºï½ü¤ò¹Ô¤¦¡£
.LP
.\"O The operation of
.\"O .BR shm_open ()
.\"O is analogous to that of
.\"O .BR open (2).
.BR shm_open ()
¤ÎÆ°ºî¤Ï
.BR open (2)
¤È¤è¤¯»÷¤Æ¤¤¤ë¡£
.\"O .I name
.\"O specifies the shared memory object to be created or opened.
.\"O For portable use,
.\"O a shared memory object should be identified by a name of the form
.\"O .IR /somename ;
.\"O that is, a null-terminated string of up to
.\"O .BI NAME_MAX
.\"O (i.e., 255) characters consisting of an initial slash,
.I name
¤ÇºîÀ®¤·¤¿¤ê¥ª¡¼¥×¥ó¤·¤¿¤ê¤¹¤ë¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤ò»ØÄꤹ¤ë¡£
°Ü¿¢À­¤ò»ý¤¿¤»¤ë¤¿¤á¤Ë¤Ï¡¢¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤Ï
.I /somename
¤È¤¤¤¦·Á¼°¤Î̾Á°¤Ç¼±Ê̤·¡¢
¤½¤Î̾Á°¤Ï¡¢ºÇÂç¤Ç
.B NAME_MAX
(¤¹¤Ê¤ï¤Á 255) ʸ»ú¤Î NULL ½ªÃ¼¤µ¤ì¤¿Ê¸»úÎó¤Ç¡¢
.\" glibc allows the initial slash to be omitted, and makes
.\" multiple initial slashes equivalent to a single slash.
.\" This differs from the implementation of POSIX message queues.
.\"O followed by one or more characters, none of which are slashes.
¥¹¥é¥Ã¥·¥å¤Ç»Ï¤Þ¤ê¡¢¥¹¥é¥Ã¥·¥å°Ê³°¤Îʸ»ú¤¬ 1 ʸ»ú°Ê¾å³¤¯·Á¼°
¤Ë¤¹¤Ù¤­¤Ç¤¢¤ë¡£
.\" glibc allows subdirectory components in the name, in which
.\" case the subdirectory must exist under /dev/shm, and allow the
.\" required permissions if a user wants to create a shared memory
.\" object in that subdirectory.
.LP
.\"O .I oflag
.\"O is a bit mask created by ORing together exactly one of
.\"O .B O_RDONLY
.\"O or
.\"O .B O_RDWR
.\"O and any of the other flags listed here:
.I oflag
¤Ï¥Ó¥Ã¥È¥Þ¥¹¥¯¤Ç¡¢
.B O_RDONLY
¤È
.B O_RDWR
¤Î¤¤¤º¤ì¤«°ìÊý¤È¡¢°Ê²¼¤Ë½Ò¤Ù¤ë¾¤Î¥Õ¥é¥°¤ÎÏÀÍýϤò¤È¤Ã¤¿¤â¤Î
¤ò»ØÄꤹ¤ë¡£
.TP 1.1i
.B O_RDONLY
.\"O Open the object for read access.
.\"O A shared memory object opened in this way can only be
.\"O .BR mmap (2)ed
.\"O for read (\fBPROT_READ\fP) access.
Æɤ߽Ф·¥¢¥¯¥»¥¹ÍѤ˥ª¥Ö¥¸¥§¥¯¥È¤ò¥ª¡¼¥×¥ó¤¹¤ë¡£
¤³¤Î¥Õ¥é¥°¤ò»ØÄꤷ¤Æ¥ª¡¼¥×¥ó¤µ¤ì¤¿¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤Ï¡¢
Æɤ߽Ф· (\fBPROT_READ\fP) ¥¢¥¯¥»¥¹¤Ç¤Î¤ß
.BR mmap (2)
¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
.TP
.B O_RDWR
.\"O Open the object for read-write access.
Æɤ߽ñ¤­¥¢¥¯¥»¥¹ÍѤ˥ª¥Ö¥¸¥§¥¯¥È¤ò¥ª¡¼¥×¥ó¤¹¤ë¡£
.TP
.B O_CREAT
.\"O Create the shared memory object if it does not exist.
¸ºß¤·¤Ê¤¤¾ì¹ç¡¢¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤òºîÀ®¤¹¤ë¡£
.\"O The user and group ownership of the object are taken
.\"O from the corresponding effective IDs of the calling process,
.\"O .\" In truth it is actually the file system IDs on Linux, but these
.\"O .\" are nearly always the same as the effective IDs.  (MTK, Jul 05)
.\"O and the object's
.\"O permission bits are set according to the low-order 9 bits of
.\"O .IR mode ,
.\"O except that those bits set in the process file mode
.\"O creation mask (see
.\"O .BR umask (2))
.\"O are cleared for the new object.
¥ª¥Ö¥¸¥§¥¯¥È¤Î¥æ¡¼¥¶¤È¥°¥ë¡¼¥×¤Î½êÍ­¸¢¤Ï¡¢
¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤ÎÂбþ¤¹¤ë¼Â¸ú ID ¤¬»È¤ï¤ì¡¢
.\" ËÜÅö¤Ï¡¢Linux ¤Ç¤Ï¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à ID ¤¬»È¤ï¤ì¤ë¤Î¤À¤¬¡¢
.\" ¤½¤ÎÃͤϤۤȤó¤É¤¤¤Ä¤â¼Â¸ú ID ¤ÈƱ¤¸¤Ç¤¢¤ë¡£ (MTK, Jul 05)
¥ª¥Ö¥¸¥§¥¯¥È¤Îµö²Ä¥Ó¥Ã¥È¤Ï
.I mode
¤Î²¼°Ì 9 ¥Ó¥Ã¥È¤Ë´ð¤Å¤¤¤ÆÀßÄꤵ¤ì¤ë¡£¤¿¤À¤·¡¢
¥Õ¥¡¥¤¥ë¥â¡¼¥ÉºîÀ®¥Þ¥¹¥¯
.RB ( umask (2)
»²¾È) ¤ËÀßÄꤵ¤ì¤Æ¤¤¤ëÃͤϡ¢¿·µ¬¥ª¥Ö¥¸¥§¥¯¥È¤Ë´Ø¤·¤Æ¤Ï¥¯¥ê¥¢¤µ¤ì¤ë¡£
.\"O A set of macro constants which can be used to define
.\"O .I mode
.\"O is listed in
.\"O .BR open (2).
.\"O (Symbolic definitions of these constants can be obtained by including
.\"O .IR <sys/stat.h> .)
.I mode
¤òÄêµÁ¤¹¤ë¤¿¤á¤Ë»ÈÍѤǤ­¤ë¥Þ¥¯¥íÄê¿ô(·²)¤Ï
.BR open (2)
¤Ëµ­ºÜ¤µ¤ì¤Æ¤¤¤ë
(¤³¤ì¤é¤ÎÄê¿ô¤Î¥·¥ó¥Ü¥ëÄêµÁ¤Ï
.I <sys/stat.h>
¤Î¥¤¥ó¥¯¥ë¡¼¥É¤Ë¤è¤êÆÀ¤é¤ì¤ë)¡£
.sp
.\"O A new shared memory object initially has zero length \(em the size of the
.\"O object can be set using
.\"O .BR ftruncate (2).
.\"O The newly-allocated bytes of a shared memory
.\"O object are automatically initialized to 0.
¿·µ¬¤ËºîÀ®¤µ¤ì¤¿¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤ÏŤµ 0 ¤Ç½é´ü²½¤µ¤ì¤ë¡£
¥ª¥Ö¥¸¥§¥¯¥È¤ÎÂ礭¤µ¤Ï
.BR ftruncate (2)
¤ò»È¤Ã¤ÆÀßÄê¤Ç¤­¤ë¡£
¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤È¤·¤Æ¿·µ¬¤Ë³ÎÊݤµ¤ì¤¿¥Ð¥¤¥È¤Ï¼«Æ°Åª¤Ë
0 ¤Ë½é´ü²½¤µ¤ì¤ë¡£
.TP
.B O_EXCL
.\"O If
.\"O .B O_CREAT
.\"O was also specified, and a shared memory object with the given
.\"O .I name
.\"O already exists, return an error.
.\"O The check for the existence of the object, and its creation if it
.\"O does not exist, are performed atomically.
.B O_CREAT
¤¬°ì½ï¤Ë»ØÄꤵ¤ì¤Æ¤ª¤ê¡¢
.I name
¤Ç»ØÄꤵ¤ì¤¿¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤¬´û¤Ë¸ºß¤·¤¿¾ì¹ç¡¢
¥¨¥é¡¼¤òÊÖ¤¹¡£
¥ª¥Ö¥¸¥§¥¯¥È¤Î¸ºß³Îǧ¤È¡¢Â¸ºß¤·¤Ê¤«¤Ã¤¿¾ì¹ç¤Î¥ª¥Ö¥¸¥§¥¯¥ÈºîÀ®¤Ï¡¢
ɬ¤º°ìÏ¢¤ÎÁàºî¤È¤·¤Æ¼Â¹Ô¤µ¤ì¤ë (performed atomically)¡£
.TP
.B O_TRUNC
.\"O If the shared memory object already exists, truncate it to zero bytes.
¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤¬¤¹¤Ç¤Ë¸ºß¤·¤¿¾ì¹ç¡¢
¤½¤Î¥ª¥Ö¥¸¥§¥¯¥È¤ò 0 ¥Ð¥¤¥È¤ËÀÚ¤êµÍ¤á¤ë¡£
.LP
.\"O Definitions of these flag values can be obtained by including
.\"O .IR <fcntl.h> .
¤³¤ì¤é¤Î¥Õ¥é¥°ÃͤÎÄêµÁ¤Ï
.I <fcntl.h>
¤Î¥¤¥ó¥¯¥ë¡¼¥É¤Ë¤è¤êÆÀ¤é¤ì¤ë¡£
.LP
.\"O On successful completion
.\"O .BR shm_open ()
.\"O returns a new file descriptor referring to the shared memory object.
.\"O This file descriptor is guaranteed to be the lowest-numbered file descriptor
.\"O not previously opened within the process.
.\"O The
.\"O .B FD_CLOEXEC
.\"O flag (see
.\"O .BR fcntl (2))
.\"O is set for the file descriptor.
À®¸ù¤·¤Æ´°Î»¤·¤¿¾ì¹ç¡¢
.BR shm_open ()
¤Ï¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤ò»²¾È¤¹¤ë¿·¤·¤¤¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤òÊÖ¤¹¡£
¤³¤Î¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ï¡¢¤½¤Î¥×¥í¥»¥¹Æâ¤Ç²áµî¤Ë¥ª¡¼¥×¥ó¤µ¤ì¤Æ¤¤¤Ê¤¤
¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤ÎÃæ¤ÇºÇ¤â¾®¤µ¤Ê¿ô¤Ë¤Ê¤ë¤³¤È¤¬Êݾڤµ¤ì¤ë¡£
.B FD_CLOEXEC
¥Õ¥é¥°
.RB ( fcntl (2)
¤ò»²¾È) ¤¬¡¢¤³¤Î¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤ËÀßÄꤵ¤ì¤ë¡£
.PP
.\"O The file descriptor is normally used in subsequent calls
.\"O to
.\"O .BR ftruncate (2)
.\"O (for a newly created object) and
.\"O .BR mmap (2).
.\"O After a call to
.\"O .BR mmap (2)
.\"O the file descriptor may be closed without affecting the memory mapping.
Ä̾¤³¤ì¤é¤Î¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ï¡¢¤³¤Î¸å³¤±¤Æ¼Â¹Ô¤µ¤ì¤ë
.BR ftruncate (2)
(¿·µ¬¤ËºîÀ®¤µ¤ì¤¿¥ª¥Ö¥¸¥§¥¯¥È¤Î¾ì¹ç¤Î¤ß) ¤È
.BR mmap (2)
¤Î¸Æ¤Ó½Ð¤·¤Ë»ÈÍѤµ¤ì¤ë¡£
.BR mmap (2)
¤ò¸Æ¤Ó½Ð¤·¤¿¸å¤Ï¡¢¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤ò¥¯¥í¡¼¥º¤·¤Æ¤â¤è¤¯¡¢
¥¯¥í¡¼¥º¤·¤Æ¤â¥á¥â¥ê¡¦¥Þ¥Ã¥Ô¥ó¥°¤Ë±Æ¶Á¤òÍ¿¤¨¤ë¤³¤È¤Ï¤Ê¤¤¡£
.PP
.\"O The operation
.\"O of
.\"O .BR shm_unlink ()
.\"O is analogous to
.\"O .BR unlink (2):
.\"O it removes a shared memory object name, and, once all processes
.\"O have unmapped the object, de-allocates and
.\"O destroys the contents of the associated memory region.
.BR shm_unlink ()
¤ÎÆ°ºî¤Ï
.BR unlink (2)
¤È¤è¤¯»÷¤Æ¤¤¤ë:
¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È̾¤òºï½ü¤·¡¢¤¹¤Ù¤Æ¤Î¥×¥í¥»¥¹¤¬½èÍýÂоݤÎ
¥ª¥Ö¥¸¥§¥¯¥È¤ò¥¢¥ó¥Þ¥Ã¥×¤·¤¿»þÅÀ¤Ç¥ª¥Ö¥¸¥§¥¯¥È¤Î³ä¤êÅö¤Æ¤ò²ò½ü¤·¡¢
Âбþ¤¹¤ë¥á¥â¥êÎΰè¤ÎÆâÍƤòÇË´þ¤¹¤ë¡£
.\"O After a successful
.\"O .BR shm_unlink (),
.\"O attempts to
.\"O .BR shm_open ()
.\"O an object with the same
.\"O .I name
.\"O will fail (unless
.\"O .B O_CREAT
.\"O was specified, in which case a new, distinct object is created).
.BR shm_unlink ()
¤¬À®¸ù¤·¤¿¸å¤Ç¡¢Æ±¤¸
.I name
¤ò»ý¤Ä¥ª¥Ö¥¸¥§¥¯¥È¤ËÂФ·¤Æ
.BR shm_open ()
¤ò¹Ô¤¦¤È¡¢
.RB ( O_CREAT
¤¬»ØÄꤵ¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç) ¼ºÇÔ¤¹¤ë¡£
.RB ( O_CREAT
¤¬»ØÄꤵ¤ì¤Æ¤¤¤ë¾ì¹ç¡¢¿·¤·¤¯Ê̤Υª¥Ö¥¸¥§¥¯¥È¤¬ºîÀ®¤µ¤ì¤ë)¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On success,
.\"O .BR shm_open ()
.\"O returns a nonnegative file descriptor.
.\"O On failure,
.\"O .B shm_open ()
.\"O returns \-1.
.\"O .BR shm_unlink ()
.\"O returns 0 on success, or \-1 on error.
À®¸ù¤·¤¿¾ì¹ç¡¢
.BR shm_open ()
¤ÏÈóÉé¤Î¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤òÊÖ¤¹¡£
¼ºÇÔ¤·¤¿¾ì¹ç¡¢
.BR shm_open ()
¤Ï \-1 ¤òÊÖ¤¹¡£
.BR shm_unlink ()
¤Ï¡¢À®¸ù¤·¤¿¾ì¹ç 0 ¤ò¡¢¥¨¥é¡¼¤¬µ¯¤³¤Ã¤¿¾ì¹ç \-1 ¤òÊÖ¤¹¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.\"O On failure,
.\"O .I errno
.\"O is set to indicate the cause of the error.
.\"O Values which may appear in
.\"O .I errno
.\"O include the following:
¼ºÇÔ¤·¤¿¾ì¹ç¡¢¥¨¥é¡¼¤Î¸¶°ø¤ò¼¨¤¹¤¿¤á
.I errno
¤¬ÀßÄꤵ¤ì¤ë¡£
.I errno
¤ËÀßÄꤵ¤ì¤ëÃͤϰʲ¼¤ÎÄ̤ê¤Ç¤¢¤ë:
.TP
.B EACCES
.\"O Permission to
.\"O .BR shm_unlink ()
.\"O the shared memory object was denied.
¶¦Í­¥á¥â¥ê¥ª¥Ö¥¸¥§¥¯¥È¤ò
.BR shm_unlink ()
¤¹¤ë¸¢¸Â¤¬¤Ê¤«¤Ã¤¿¡£
.TP
.B EACCES
.\"O Permission was denied to
.\"O .BR shm_open ()
.\"O .I name
.\"O in the specified
.\"O .IR mode ,
.\"O or
.\"O .B O_TRUNC
.\"O was specified and the caller does not have write permission on the object.
»ØÄꤵ¤ì¤¿
.I mode
¤Ç
.I name
¤ò
.BR shm_open ()
¤¹¤ë¸¢¸Â¤¬¤Ê¤«¤Ã¤¿¡£¤â¤·¤¯¤Ï¡¢
.B O_TRUNC
¤¬»ØÄꤵ¤ì¤¿¤¬¡¢¸Æ¤Ó½Ð¤·¸µ¤Ë¤Ï¤½¤Î¥ª¥Ö¥¸¥§¥¯¥È¤ËÂФ¹¤ë½ñ¤­¹þ¤ß¸¢¸Â¤¬
¤Ê¤«¤Ã¤¿¡£
.TP
.B EEXIST
.\"O Both
.\"O .B O_CREAT
.\"O and
.\"O .B O_EXCL
.\"O were specified to
.\"O .BR shm_open ()
.\"O and the shared memory object specified by
.\"O .I name
.\"O already exists.
.B O_CREAT
¤È
.B O_EXCL
¤ÎξÊý¤¬
.BR shm_open ()
¤Ë»ØÄꤵ¤ì¤¿¤¬¡¢
.I name
¤Ç»ØÄꤵ¤ì¤¿¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤¬´û¤Ë¸ºß¤·¤¿¡£
.TP
.B EINVAL
.\"O The
.\"O .I name
.\"O argument to
.\"O .BR shm_open ()
.\"O was invalid.
.BR shm_open ()
¤ËÍ¿¤¨¤é¤ì¤¿
.I name
°ú¤­¿ô¤¬ÉÔÀµ¤Ç¤¢¤Ã¤¿¡£
.TP
.B EMFILE
.\"O The process already has the maximum number of files open.
¥×¥í¥»¥¹¤¬¥ª¡¼¥×¥ó²Äǽ¤Ê¥Õ¥¡¥¤¥ë¿ô¤Î¾å¸Â¤Ë¤¹¤Ç¤Ë㤷¤Æ¤¤¤¿¡£
.TP
.B ENAMETOOLONG
.\"O The length of
.\"O .I name
.\"O exceeds
.\"O .BR PATH_MAX .
.I name
¤ÎŤµ¤¬
.B PATH_MAX
¤ò±Û¤¨¤Æ¤¤¤ë¡£
.TP
.B ENFILE
.\"O The limit on the total number of files open on the system has been
.\"O reached.
¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ç¥ª¡¼¥×¥ó¤Ç¤­¤ë¥Õ¥¡¥¤¥ë¿ô¤Î¾å¸Â¤Ë㤷¤¿¡£
.TP
.B ENOENT
.\"O An attempt was made to
.\"O .BR shm_open ()
.\"O a
.\"O .I name
.\"O that did not exist, and
.\"O .B O_CREAT
.\"O was not specified.
¸ºß¤·¤Æ¤¤¤Ê¤¤
.I name
¤Î¥ª¥Ö¥¸¥§¥¯¥È¤ò
.BR shm_open ()
¤·¤è¤¦¤È¤·¤¿¤¬¡¢
.B O_CREAT
¤¬»ØÄꤵ¤ì¤Æ¤¤¤Ê¤«¤Ã¤¿¡£
.TP
.B ENOENT
.\"O An attempt was to made to
.\"O .BR shm_unlink ()
.\"O a
.\"O .I name
.\"O that does not exist.
¸ºß¤·¤Ê¤¤
.I name
¤Î¥ª¥Ö¥¸¥§¥¯¥È¤ò
.BR shm_unlink ()
¤·¤è¤¦¤È¤·¤¿¡£
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O These functions are provided in glibc 2.2 and later.
¤³¤ì¤é¤Î´Ø¿ô¤Ï glibc 2.2 °Ê¹ß¤ÇÄ󶡤µ¤ì¤Æ¤¤¤ë¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
POSIX.1-2001.
.LP
.\"O POSIX.1-2001 says that the group ownership of a newly created shared
.\"O memory object is set to either the calling process's effective group ID
.\"O or "a system default group ID".
POSIX.1-2001 ¤Ë¤Ï¡¢¿·µ¬¤ËºîÀ®¤µ¤ì¤ë¶¦Í­¥á¥â¥ê¥ª¥Ö¥¸¥§¥¯¥È¤Î¥°¥ë¡¼¥×½êÍ­¸¢¤Ï¡¢
¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î¼Â¸ú¥°¥ë¡¼¥× ID ¤« ¡Ö¥·¥¹¥Æ¥à¤Î¥Ç¥Õ¥©¥ë¥È¤Î¥°¥ë¡¼¥× ID¡×
¤Î¤É¤Á¤é¤«¤ËÀßÄꤵ¤ì¤ë¡¢¤È½ñ¤«¤ì¤Æ¤¤¤ë¡£
.\"O .SH "NOTES"
.SH Ãí°Õ
.LP
.\"O POSIX leaves the behavior of the combination of
.\"O .B O_RDONLY
.\"O and
.\"O .B O_TRUNC
.\"O unspecified.
.\"O On Linux, this will successfully truncate an existing
.\"O shared memory object \(em this may not be so on other Unix systems.
POSIX ¤Ï
.B O_RDONLY
¤È
.B O_TRUNC
¤¬°ì½ï¤Ë»ØÄꤵ¤ì¤¿¾ì¹ç¤ÎÆ°ºî¤ò̤ÄêµÁ¤Ë¤·¤Æ¤¤¤ë¡£Linux ¤Ç¤Ï¡¢
´û¸¤Î¶¦Í­¥á¥â¥ê¡¦¥ª¥Ö¥¸¥§¥¯¥È¤ËÂФ¹¤ëÀÚ¤êµÍ¤á (truncate) ¤ÏÀ®¸ù¤¹¤ë¡£
¤·¤«¤·¡¢Â¾¤Î Unix ¥·¥¹¥Æ¥à¤Ç¤âƱ¤¸¤Ç¤¢¤ë¤È¤Ï¸Â¤é¤Ê¤¤¡£
.LP
.\"O The POSIX shared memory object implementation on Linux 2.4 makes use
.\"O of a dedicated file system, which is normally
.\"O mounted under
.\"O .IR /dev/shm .
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.I /dev/shm
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.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR close (2),
.BR fchmod (2),
.BR fchown (2),
.BR fcntl (2),
.BR fstat (2),
.BR ftruncate (2),
.BR mmap (2),
.BR open (2),
.BR umask (2),
.BR shm_overview (7)