[linuxjm/LDP_man-pages.git] / obsolete / man3 / readv.3

.\" (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.
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.\" 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
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.\" 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.\" manual page may be incorrect or out-of-date.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
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.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\" License.
.\" Modified Sat Jul 24 18:34:44 1993 by Rik Faith (faith@cs.unc.edu)
.\"
.\" Japanese Version Copyright (c) 1998 Shigeru Tada
.\"     all rights reserved.
.\" Translated Mon, 25 May 1998 
.\"     by Shigeru Tada <stada@mech.titech.ac.jp>
.\"
.TH READV 3  "April 25, 1993" "GNU" "Linux Programmer's Manual"
.SH ̾Á°
readv, writev \- Ê£¿ô¤Î¥Ð¥Ã¥Õ¥¡¡¼¤òÍѤ¤¤¿¥Õ¥¡¥¤¥ëÆþ½ÐÎÏ
.SH ½ñ¼°
.nf
.B #include <sys/uio.h>
.sp
.BI "int readv(int " filedes ", const struct iovec *" vector ,
.BI "          size_t " count );
.sp
.BI "int writev(int " filedes ", const struct iovec *" vector ,
.BI "          size_t " count );
.fi
.SH ÀâÌÀ
.B readv()
´Ø¿ô¤Ï¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼\fIfiledes\fP¤ËÏ¢·ë¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤«¤é
\fIcount\fP¥Ö¥í¥Ã¥¯¤ò¡¢\fIvector\fP¤Ç»ØÄꤵ¤ì¤¿Ê£¿ô¤Î¥Ð¥Ã¥Õ¥¡¡¼¤ËÆÉ
¤ß¹þ¤à¡£
.PP
\fBwritev()\fP´Ø¿ô¤Ï¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼\fIfiledes\fP
¤ËÏ¢·ë¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë\fIvector\fP¥Ý¥¤¥ó¥¿¤Ç»ØÄꤵ¤ì¤¿ºÇÂç
\fIcount\fP¥Ö¥í¥Ã¥¯¤Þ¤Ç¤ò¥Ð¥Ã¥Õ¥¡¡¼¤«¤é½ñ¤­¹þ¤à¡£
.PP
.I vector
¥Ý¥¤¥ó¥¿¤Ï
.PP
.br
.nf
.in 10
struct iovec {
.in 14
void *iov_base;   /* Starting address */
size_t iov_len;   /* Number of bytes */
.in 10
} ;
.fi
.PP
¤Î¤è¤¦¤Ë\fB<sys/uio.h>\fP¤ÎÃæ¤ÇÄêµÁ¤µ¤ì¤ë¹½Â¤ÂÎ\fBiovec\fP¤ò»Ø¤¹¡£
.PP
¥Ð¥Ã¥Õ¥¡¤Ï
.IR "vector[0]" ", " vector[1] ", ... " "vector[count-1]" .
¤Î½ç¤Ç½èÍý¤µ¤ì¤ë¡£
.PP
\fBreadv()\fP´Ø¿ô¤ÏÊ£¿ô¤Î¥Ð¥Ã¥Õ¥¡¡¼¤ËÆɤ߹þ¤à¤È¤¤¤¦¤³¤È¤ò½ü¤±¤Ð¡¢
\fBread(2)\fP¤È¤Þ¤Ã¤¿¤¯Æ±¤¸¤è¤¦¤ËÆ°ºî¤¹¤ë¡£
.PP
\fBwritev()\fP´Ø¿ô¤ÏÊ£¿ô¤Î¥Ð¥Ã¥Õ¥¡¡¼¤«¤é½ñ¤­¹þ¤à¤È¤¤¤¦¤³¤È¤ò½ü¤±¤Ð¡¢
\fBwrite(2)\fP¤È¤Þ¤Ã¤¿¤¯Æ±¤¸¤è¤¦¤ËÆ°ºî¤¹¤ë¡£
.SH ÊÖ¤êÃÍ
\fBreadv()\fP´Ø¿ô¤Ï½ñ¤­¹þ¤Þ¤ì¤¿¥Ð¥¤¥È¿ô¤òÊÖ¤¹¡£
¥¨¥é¡¼¤Î¾ì¹ç¤Ï \-1 ¤òÊÖ¤¹¡£
\fBwritev()\fP´Ø¿ô¤ÏÆɤ߹þ¤Þ¤ì¤¿¥Ð¥¤¥È¿ô¤òÊÖ¤¹¡£
¥¨¥é¡¼¤Î¾ì¹ç¤Ï \-1 ¤òÊÖ¤¹¡£
.SH ¥¨¥é¡¼
\fBreadv()\fP¤È\fBwritev()\fP´Ø¿ô¤Ï¼ºÇÔ¤·¤¿¾ì¹ç\fIerrno\fP¤ò°Ê²¼¤ÎÃͤË
ÀßÄꤹ¤ë¡£
.TP
.B EBADDF
\fI fd\fP¤¬Í­¸ú¤Ê¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤Ç¤Ï¤Ê¤¤
.TP
.B EINVAL
\fI fd\fP¤¬¡Ê\fBR readv()\fP¤Î¾ì¹ç¡ËÆɤ߹þ¤á¤Ê¤¤¤«¡¢
¡Ê\fBR writev()\fP¤Î¾ì¹ç¡Ë½ñ¤­¹þ¤á¤Ê¤¤¡£
.TP
.B EFAULT
\fI buf\fP¤¬¥¢¥¯¥»¥¹²Äǽ¤Ê¥¢¥É¥ì¥¹¶õ´Ö¤Î³°¤Ë¤¢¤ë¡£
.TP
.B EAGAIN 
\fB open()\fP´Ø¿ô¤ò¸Æ¤Ó½Ð¤¹»þ¤ËÈóÄä»ß(Non-blocking) I/O ¤¬ÁªÂò¤µ¤ì¤Æ¤ª¤ê¡¢
¤¹¤°¤Ë¥Ç¡¼¥¿¤¬Æɤ߹þ¤ß²Äǽ¤Ç¤Ï¤Ê¤«¤Ã¤¿¡£
.TP
.B EINTR
¥Ç¡¼¥¿¤¬°ú¤­ÅϤµ¤ì¤ëÁ°¤Ë¡¢Æɤߤ³¤ß¤¢¤ë¤¤¤Ï½ñ¤­¹þ¤ß¤Ø¤Î
³ä¤ê¹þ¤ß¤¬¤ª¤³¤Ã¤¿¡£
.SH ½àµò
ÉÔÌÀ
.SH ¥Ð¥°
\fBR readv() "¤¢¤ë¤¤¤Ï" writev()\fP¤Î¤è¤¦¤Ê¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤ò
Áàºî¤¹¤ë´Ø¿ô¤ò¡¢stdio¥é¥¤¥Ö¥é¥ê¡¼¤«¤é¸Æ¤Ó½Ð¤µ¤ì¤ë´Ø¿ô¤ÈÁȤ߹ç¤ï¤»¤Æ¸Æ
¤Ó½Ð¤¹¤³¤È¤Ï¿ä¾©¤Ç¤­¤Ê¤¤¡£¤½¤Î·ë²Ì¤ÏÄêµÁ¤µ¤ì¤Ê¤¤¤â¤Î¤Ç¤¢¤ê¡¤¤ª¤½¤é¤¯
´üÂÔ¤·¤¿·ë²Ì¤ÏÆÀ¤é¤ì¤Ê¤¤¡£
.SH ´ØÏ¢¹àÌÜ
.BR read (2),
.BR write (2)