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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man3 / mkfifo.3

.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" This manpage is Copyright (C) 1995 James R. Van Zandt <jrv@vanzandt.mv.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.\" manual page may be incorrect or out-of-date.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.
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.\" changed section from 2 to 3, aeb, 950919
.\"
.\" Japanese Version Copyright (c) 1998 George Momma
.\"         all rights reserved.
.\" Translated Mon May 25 23:11:03 JST 1998
.\"         by George Momma <momma@wakhok.ac.jp>
.\" Updated 1999-12-11 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2008-07-30 by Kentaro Shirakata <argrath@ub32.org>
.\"
.\"WORD:        named pipe              ̾Á°ÉÕ¤­¥Ñ¥¤¥×
.\"WORD:        permission              µö²Ä¥â¡¼¥É
.\"WORD:        filename                ¥Õ¥¡¥¤¥ë̾
.\"WORD:        filename component      ¥Õ¥¡¥¤¥ë̾Éôʬ
.\"WORD:        directory component     ¥Ç¥£¥ì¥¯¥È¥êÉôʬ
.TH MKFIFO 3 2008-06-12 "GNU" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O mkfifo \- make a FIFO special file (a named pipe)
mkfifo \- FIFO¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë(̾Á°ÉÕ¤­¥Ñ¥¤¥×)¤òºîÀ®¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B #include <sys/types.h>
.B #include <sys/stat.h>
.sp
.BI "int mkfifo(const char *" pathname ", mode_t " mode );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O .BR mkfifo ()
.\"O makes a FIFO special file with name \fIpathname\fP.
.\"O \fImode\fP specifies the FIFO's permissions.
.\"O It is modified by the
.\"O process's \fBumask\fP in the usual way: the permissions of the created
.\"O file are \fB(\fP\fImode\fP\fB & ~umask)\fP.
.BR mkfifo ()
¤Ï̾Á° \fIpathname\fP ¤ò»ý¤ÄFIFO¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë¤òºîÀ®
¤¹¤ë¡£FIFO¤Îµö²Ä¥â¡¼¥É¤Ï \fImode\fP ¤Ç»ØÄꤵ¤ì¡¢¥×¥í¥»¥¹¤Î
\fBumask\fP ¤Ë¤è¤Ã¤ÆÄ̾ï¤ÎÊý¼°¤ÇÊѹ¹¤ò¼õ¤±¤ë: ºîÀ®¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤Îµö²Ä
¥â¡¼¥É¤Ï \fB(\fP\fImode\fP\fB & ~umask)\fP ¤È¤Ê¤ë¡£
.PP
.\"O A FIFO special file is similar to a pipe, except that it is created
.\"O in a different way.
.\"O Instead of being an anonymous communications
.\"O channel, a FIFO special file is entered into the file system by
.\"O calling
.\"O .BR mkfifo ().
FIFO¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë¤Ï¥Ñ¥¤¥×¤Ë»÷¤Æ¤¤¤ë¤¬¡¢ºîÀ®¤Î¤µ¤ìÊý¤Î¤ß¤¬°Û¤Ê¤Ã¤Æ
¤¤¤ë¡£FIFO¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë¤Ï̾Á°¤Î¤Ê¤¤ÄÌ¿®Ï©¤Ç¤Ï¤Ê¤¯¡¢
.BR mkfifo ()
¤Î¸Æ¤Ó½Ð¤·¤Ë¤è¤ê¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ÎÃæ¤Ë²Ã¤¨¤é¤ì¤ë¡£
.PP
.\"O Once you have created a FIFO special file in this way, any process can
.\"O open it for reading or writing, in the same way as an ordinary file.
.\"O However, it has to be open at both ends simultaneously before you can
.\"O proceed to do any input or output operations on it.
.\"O Opening a FIFO for reading normally blocks until some
.\"O other process opens the same FIFO for writing, and vice versa.
.\"O See
.\"O .BR fifo (7)
.\"O for nonblocking handling of FIFO special files.
¤Ò¤È¤¿¤Ó¤³¤Î¤è¤¦¤Ë¤·¤ÆFIFO¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë¤¬ºîÀ®¤µ¤ì¤ë¤È¡¢Ä̾ï¤Î¥Õ¥¡
¥¤¥ë¤ÈƱ¤¸¤è¤¦¤Ë¡¢¤É¤Î¥×¥í¥»¥¹¤«¤é¤Ç¤âÆɤ߽Ф·¡¢½ñ¤­¹þ¤ßÍѤˤ³¤ì¤ò¥ª¡¼
¥×¥ó¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£¤¿¤À¤·¡¢¤³¤ì¤ËÂФ¹¤ëÁ´¤Æ¤ÎÆþ½ÐÎÏÁàºî¤ËÀèΩ¤Ã¤Æ
¤½¤Îξü¤¬¥ª¡¼¥×¥ó¤µ¤ì¤Æ¤¤¤ëɬÍפ¬¤¢¤ë¡£FIFO¤òÆɤ߽Ф·ÍѤ˥ª¡¼¥×¥ó¤¹¤ë
¤È¡¢Ä̾ï¾¤Î¥×¥í¥»¥¹¤Ë¤è¤Ã¤ÆƱ¤¸FIFO¤¬½ñ¤­¹þ¤ßÍѤ˥ª¡¼¥×¥ó¤µ¤ì¤ë¤Þ¤Ç¥Ö
¥í¥Ã¥¯¤µ¤ì¡¢µÕ¤Î¾ì¹ç¤âƱÍͤǤ¢¤ë¡£
FIFO¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë¤ò¥Ö¥í¥Ã¥¯¤»¤º¤Ë°·¤¦ÊýË¡¤Ë¤Ä¤¤¤Æ¤Ï
.BR fifo (7)
¤ò»²¾È¤Î¤³¤È¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On success
.\"O .BR mkfifo ()
.\"O returns 0.
.\"O In the case of an error, \-1 is returned (in which case, \fIerrno\fP
.\"O is set appropriately).
À®¸ù¤·¤¿¾ì¹ç
.BR mkfifo ()
¤Ï 0 ¤òÊÖ¤¹¡£
¥¨¥é¡¼¤Î¾ì¹ç \-1 ¤òÊÖ¤¹ (¤Þ¤¿ \fIerrno\fP ¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë)¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.TP
.B EACCES
.\"O One of the directories in \fIpathname\fP did not allow search
.\"O (execute) permission.
\fIpathname\fP ¤ÎÃæ¤Î¥Ç¥£¥ì¥¯¥È¥ê¤Î°ì¤Ä¤ËÂФ·¸¡º÷(¼Â¹Ô)µö²Ä¤¬¤Ê¤¤¡£
.TP
.B EEXIST
.\"O \fIpathname\fP already exists.
.\"O This includes the case where
.\"O .I pathname
.\"O is a symbolic link, dangling or not.
\fIpathname\fP ¤¬¤¹¤Ç¤Ë¸ºß¤¹¤ë¡£
¤³¤ì¤Ë¤Ï¡¢
.I pathname
¤¬(¥ê¥ó¥¯Àڤ줫¤É¤¦¤«¤Ë´Ø¤ï¤é¤º)¥·¥ó¥Ü¥ê¥Ã¥¯¥ê¥ó¥¯¤Ç¤¢¤ë¾ì¹ç¤â´Þ¤à¡£
.TP
.B ENAMETOOLONG
.\"O Either the total length of \fIpathname\fP is greater than
.\"O \fBPATH_MAX\fP, or an individual filename component has a length
.\"O greater than \fBNAME_MAX\fP.
.\"O In the GNU system, there is no imposed
.\"O limit on overall filename length, but some file systems may place
.\"O limits on the length of a component.
\fIpathname\fP ¤ÎŤµ¤¬ \fBPATH_MAX\fP ¤òĶ¤¨¤Æ¤¤¤ë¤«¡¢¸Ä¡¹¤Î¥Õ¥¡¥¤¥ë
̾Éôʬ¤ÎŤµ¤¬ \fBNAME_MAX\fP ¤òĶ¤¨¤Æ¤¤¤ë¡£GNU¥·¥¹¥Æ¥à¤Ë¤ª¤¤¤Æ¤Ï¡¢¥Õ¥¡
¥¤¥ë̾¤ÎÁ´ÂΤÎŤµ¤ËÂФ·¤Æ¤ÏÀ©¸Â¤Ï²Ý¤»¤é¤ì¤Æ¤¤¤Ê¤¤¤¬¡¢¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à
¤Ë¤è¤Ã¤Æ¤Ï³ÆÉôʬ¤ÎŤµ¤ËÀ©¸Â¤Î¤¢¤ë²ÄǽÀ­¤¬¤¢¤ë¡£
.TP
.B ENOENT
.\"O A directory component in \fIpathname\fP does not exist or is a
.\"O dangling symbolic link.
\fIpathname\fP ¤ÎÃæ¤Î¥Ç¥£¥ì¥¯¥È¥êÉôʬ¤¬Â¸ºß¤·¤Ê¤¤¤«¡¢¥ê¥ó¥¯Àè¤Î¤Ê¤¤¥·
¥ó¥Ü¥ê¥Ã¥¯¥ê¥ó¥¯¤Ç¤¢¤ë¡£
.TP
.B ENOSPC
.\"O The directory or file system has no room for the new file.
¥Ç¥£¥ì¥¯¥È¥ê¤Þ¤¿¤Ï¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ë¿·µ¬¥Õ¥¡¥¤¥ë¤òºîÀ®¤¹¤ë;ÃϤ¬¤Ê¤¤¡£
.TP
.B ENOTDIR
.\"O A component used as a directory in \fIpathname\fP is not, in fact, a
.\"O directory.
\fIpathname\fP Ãæ¤Ç¥Ç¥£¥ì¥¯¥È¥ê¤È¤·¤Æ»ÈÍѤµ¤ì¤Æ¤¤¤ëÉôʬ¤¬¼ÂºÝ¤Ë¤Ï¥Ç¥£
¥ì¥¯¥È¥ê¤Ç¤Ï¤Ê¤¤¡£
.TP
.B EROFS
.\"O \fIpathname\fP refers to a read-only file system.
\fIpathname\fP ¤¬Æɤ߼è¤êÀìÍѤΥե¡¥¤¥ë¥·¥¹¥Æ¥à¤ò»Ø¤·¤Æ¤¤¤ë¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
POSIX.1-2001.
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR mkfifo (1),
.BR close (2),
.BR open (2),
.BR read (2),
.BR stat (2),
.BR umask (2),
.BR write (2),
.BR mkfifoat (3),
.BR fifo (7)