174 lines
6.4 KiB
HTML
174 lines
6.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<html>
|
|
<head>
|
|
<meta name="generator" content="HTML Tidy, see www.w3.org">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
|
<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
|
|
<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
|
|
<title><aio.h></title>
|
|
</head>
|
|
<body bgcolor="white">
|
|
<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
|
|
</script>
|
|
|
|
<basefont size="3"> <a name="<aio.h>"></a> <a name="tag_13_02"></a><!-- <aio.h> -->
|
|
<!--header start-->
|
|
<center><font size="2">The Open Group Base Specifications Issue 6<br>
|
|
IEEE Std 1003.1-2001<br>
|
|
Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
|
|
|
|
<!--header end-->
|
|
<hr size="2" noshade>
|
|
<h4><a name="tag_13_02_01"></a>NAME</h4>
|
|
|
|
<blockquote>aio.h - asynchronous input and output (<b>REALTIME</b>)</blockquote>
|
|
|
|
<h4><a name="tag_13_02_02"></a>SYNOPSIS</h4>
|
|
|
|
<blockquote class="synopsis">
|
|
<div class="box"><tt><sup>[<a href="javascript:open_code('AIO')">AIO</a>]</sup> <img src="../images/opt-start.gif" alt=
|
|
"[Option Start]" border="0"> #include <aio.h> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></div>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_13_02_03"></a>DESCRIPTION</h4>
|
|
|
|
<blockquote>
|
|
<p>The <i><aio.h></i> header shall define the <b>aiocb</b> structure which shall include at least the following members:</p>
|
|
|
|
<pre>
|
|
<tt>int aio_fildes </tt> File descriptor. <tt>
|
|
off_t aio_offset </tt> File offset. <tt>
|
|
volatile void *aio_buf </tt> Location of buffer. <tt>
|
|
size_t aio_nbytes </tt> Length of transfer. <tt>
|
|
int aio_reqprio </tt> Request priority offset. <tt>
|
|
struct sigevent aio_sigevent </tt> Signal number and value. <tt>
|
|
int aio_lio_opcode</tt> Operation to be performed. <tt>
|
|
</tt>
|
|
</pre>
|
|
|
|
<p>This header shall also include the following constants:</p>
|
|
|
|
<dl compact>
|
|
<dt>AIO_ALLDONE</dt>
|
|
|
|
<dd>A return value indicating that none of the requested operations could be canceled since they are already complete.</dd>
|
|
|
|
<dt>AIO_CANCELED</dt>
|
|
|
|
<dd>A return value indicating that all requested operations have been canceled.</dd>
|
|
|
|
<dt>AIO_NOTCANCELED</dt>
|
|
|
|
<dd><br>
|
|
A return value indicating that some of the requested operations could not be canceled since they are in progress.</dd>
|
|
|
|
<dt>LIO_NOP</dt>
|
|
|
|
<dd>A <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a> element operation option indicating that no transfer is
|
|
requested.</dd>
|
|
|
|
<dt>LIO_NOWAIT</dt>
|
|
|
|
<dd>A <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a> synchronization operation indicating that the calling thread
|
|
is to continue execution while the <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a> operation is being performed, and
|
|
no notification is given when the operation is complete.</dd>
|
|
|
|
<dt>LIO_READ</dt>
|
|
|
|
<dd>A <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a> element operation option requesting a read.</dd>
|
|
|
|
<dt>LIO_WAIT</dt>
|
|
|
|
<dd>A <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a> synchronization operation indicating that the calling thread
|
|
is to suspend until the <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a> operation is complete.</dd>
|
|
|
|
<dt>LIO_WRITE</dt>
|
|
|
|
<dd>A <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a> element operation option requesting a write.</dd>
|
|
</dl>
|
|
|
|
<p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p>
|
|
|
|
<pre>
|
|
<tt>int aio_cancel(int, struct aiocb *);
|
|
int aio_error(const struct aiocb *);
|
|
int aio_fsync(int, struct aiocb *);
|
|
int aio_read(struct aiocb *);
|
|
ssize_t aio_return(struct aiocb *);
|
|
int aio_suspend(const struct aiocb *const[], int,
|
|
const struct timespec *);
|
|
int aio_write(struct aiocb *);
|
|
int lio_listio(int, struct aiocb *restrict const[restrict], int,
|
|
struct sigevent *restrict);
|
|
</tt>
|
|
</pre>
|
|
|
|
<p>Inclusion of the <i><aio.h></i> header may make visible symbols defined in the headers <a href=
|
|
"../basedefs/fcntl.h.html"><i><fcntl.h></i></a>, <a href="../basedefs/signal.h.html"><i><signal.h></i></a>, <a href=
|
|
"../basedefs/sys/types.h.html"><i><sys/types.h></i></a>, and <a href="../basedefs/time.h.html"><i><time.h></i></a>.</p>
|
|
</blockquote>
|
|
|
|
<hr>
|
|
<div class="box"><em>The following sections are informative.</em></div>
|
|
|
|
<h4><a name="tag_13_02_04"></a>APPLICATION USAGE</h4>
|
|
|
|
<blockquote>
|
|
<p>None.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_13_02_05"></a>RATIONALE</h4>
|
|
|
|
<blockquote>
|
|
<p>None.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_13_02_06"></a>FUTURE DIRECTIONS</h4>
|
|
|
|
<blockquote>
|
|
<p>None.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_13_02_07"></a>SEE ALSO</h4>
|
|
|
|
<blockquote>
|
|
<p><a href="fcntl.h.html"><i><fcntl.h></i></a> , <a href="signal.h.html"><i><signal.h></i></a> , <a href=
|
|
"sys/types.h.html"><i><sys/types.h></i></a> , <a href="time.h.html"><i><time.h></i></a> , the System Interfaces volume
|
|
of IEEE Std 1003.1-2001, <a href="../functions/fsync.html"><i>fsync</i>()</a>, <a href=
|
|
"../functions/lseek.html"><i>lseek</i>()</a>, <a href="../functions/read.html"><i>read</i>()</a>, <a href=
|
|
"../functions/write.html"><i>write</i>()</a></p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_13_02_08"></a>CHANGE HISTORY</h4>
|
|
|
|
<blockquote>
|
|
<p>First released in Issue 5. Included for alignment with the POSIX Realtime Extension.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_13_02_09"></a>Issue 6</h4>
|
|
|
|
<blockquote>
|
|
<p>The <i><aio.h></i> header is marked as part of the Asynchronous Input and Output option.</p>
|
|
|
|
<p>The description of the constants is expanded.</p>
|
|
|
|
<p>The <b>restrict</b> keyword is added to the prototype for <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a>.</p>
|
|
</blockquote>
|
|
|
|
<div class="box"><em>End of informative text.</em></div>
|
|
|
|
<hr>
|
|
<hr size="2" noshade>
|
|
<center><font size="2"><!--footer start-->
|
|
UNIX ® is a registered Trademark of The Open Group.<br>
|
|
POSIX ® is a registered Trademark of The IEEE.<br>
|
|
[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
|
|
"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
|
|
]</font></center>
|
|
|
|
<!--footer end-->
|
|
<hr size="2" noshade>
|
|
</body>
|
|
</html>
|
|
|