aio_return.html
来自「unix 下的C开发手册,还用详细的例程。」· HTML 代码 · 共 122 行
HTML
122 行
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>aio_return</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_001_140"> </a>NAME</h4><blockquote>aio_return - retrieve return status of an asynchronous I/O operation(<b>REALTIME</b>)</blockquote><h4><a name = "tag_000_001_141"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="aio.h.html">aio.h</a>>ssize_t aio_return(struct aiocb *<i>aiocbp</i>);</code></pre></blockquote><h4><a name = "tag_000_001_142"> </a>DESCRIPTION</h4><blockquote>The<i>aio_return()</i>function returns the return status associated with the<b>aiocb</b>structure referenced by the<i>aiocbp</i>argument.The return status for an asynchronous I/O operation is the valuethat would be returned by the corresponding<i><a href="read.html">read()</a></i>,<i><a href="write.html">write()</a></i>,or<i><a href="fsync.html">fsync()</a></i>function call.If the error status for the operation is equal toEINPROGRESS,then the return status for the operation is undefined.The<i>aio_return()</i>function may be called exactly once to retrieve the return statusof a given asynchronous operation;thereafter, if the same<b>aiocb</b>structure is used in a call to<i>aio_return()</i>or<i><a href="aio_error.html">aio_error()</a></i>,an error may be returned.When the<b>aiocb</b>structure referred to by<i>aiocbp</i>is used to submit another asynchronous operation,then<i>aio_return()</i>may be successfully used to retrieve the return statusof that operation.</blockquote><h4><a name = "tag_000_001_143"> </a>RETURN VALUE</h4><blockquote>If the asynchronous I/O operation has completed, thenthe return status, as described for<i><a href="read.html">read()</a></i>,<i><a href="write.html">write()</a></i>,and<i><a href="fsync.html">fsync()</a></i>,is returned.If the asynchronous I/O operation has not yet completed,the results of<i>aio_return()</i>are undefined.</blockquote><h4><a name = "tag_000_001_144"> </a>ERRORS</h4><blockquote>The <i>aio_return()</i>function will fail if:<dl compact><dt>[EINVAL]<dd>The<i>aiocbp</i>argument does not refer to an asynchronous operationwhose return status has not yet been retrieved.<dt>[ENOSYS]<dd>The<i>aio_return()</i>function is not supported by this implementation.</dl></blockquote><h4><a name = "tag_000_001_145"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_146"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_147"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_148"> </a>SEE ALSO</h4><blockquote><i><a href="aio_cancel.html">aio_cancel()</a></i>,<i><a href="aio_error.html">aio_error()</a></i>,<i><a href="aio_fsync.html">aio_fsync()</a></i>,<i><a href="aio_read.html">aio_read()</a></i>,<i><a href="aio_write.html">aio_write()</a></i>,<i><a href="close.html">close()</a></i>,<i><a href="_exit.html">_exit()</a></i>,<i><a href="exec.html">exec</a></i>,<i><a href="fork.html">fork()</a></i>,<i><a href="lio_listio.html">lio_listio()</a></i>,<i><a href="lseek.html">lseek()</a></i>,<i><a href="read.html">read()</a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995)</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?