📄 aio.h.html
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<!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) 2001-2003 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, 2003 Edition<br>Copyright © 2001-2003 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 isrequested.</dd><dt>LIO_NOWAIT</dt><dd>A <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a> synchronization operation indicating that the calling threadis to continue execution while the <a href="../functions/lio_listio.html"><i>lio_listio</i>()</a> operation is being performed, andno 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 threadis 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 volumeof 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>⌨️ 快捷键说明
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