678 lines
19 KiB
HTML
678 lines
19 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>readv()--Read from Descriptor Using Multiple Buffers</title>
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<!-- Begin Header Records ========================================== -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- Unix2 SCRIPT J converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- Change History: -->
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<!-- 010703 JTROUS Add ERESTART, EINTR, dev/zero, V5R2, DCR 98686 -->
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<!-- 011022 JTROUS Changes from API Review 1, V5R2 -->
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<!-- 020618 EMIG: updated for NFS threadsafety, V5R3 -->
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<!-- 020624 RTHEIS: Add fclear() and fclear64(), V5R3 -->
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<!-- 0206?? JET This file has undergone html cleanup -->
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<!-- 020718 MFENLON: updated for QFileSvr.400 threadsafety, V5R3 -->
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<!-- 050407 JTROUS: fix enums, no change flag, V5R4 -->
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<!-- Edited by Kersten Jan 02 -->
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<!-- End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<a name="Top_Of_Page"></a>
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<!-- Java sync-link -->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<h2>readv()--Read from Descriptor Using Multiple Buffers</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax<br>
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<pre>
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#include <sys/types.h>
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#include <sys/uio.h>
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int readv(int <em>descriptor</em>,
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struct iovec *<em>io_vector</em>[],
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int <em>vector_length</em>)
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</pre>
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Service Program Name: QP0LLIB1<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Conditional; see <a href="#USAGE_NOTES">Usage
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Notes</a>.<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <em>readv()</em> function is used to receive data from a file or socket
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descriptor. <em>readv()</em> provides a way for data to be stored in several
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different buffers (<em>scatter/gather I/O</em>).</p>
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<p>See <a href="read.htm">read()--Read from Descriptor</a> for more information
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related to reading from a descriptor.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>descriptor</strong></dt>
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<dd>(Input) The descriptor to be read. The descriptor refers to a file or a
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socket.<br>
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<br>
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</dd>
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<dt><strong>io_vector</strong>[]</dt>
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<dd>(I/O) The pointer to an array of type <strong>struct iovec</strong>.
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<strong>struct iovec</strong> contains a sequence of pointers to buffers in
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which the data to be read is stored. The structure pointed to by the <em>
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io_vector</em> parameter is defined in <strong><sys/uio.h></strong>.
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<pre>
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struct iovec {
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void *iov_base;
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size_t iov_len;
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}
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</pre>
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<p><em>iov_base</em> and <em>iov_len</em> are the only fields in <em>iovec</em>
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used by sockets. <em>iov_base</em> contains the pointer to a buffer and <em>
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iov_len</em> contains the buffer length. The rest of the fields are
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reserved.</p>
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</dd>
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<dt><strong>vector_length</strong></dt>
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<dd>(Input) The number of entries in <em>io_vector</em>.</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<p>No authorization is required.</p>
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<br>
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<h3>Return Value</h3>
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<dl compact>
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<dt><em>n</em></dt>
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<dd><strong>readv()</strong> is successful, where n is the number of bytes read.
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</dd>
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<dt><em>-1</em></dt>
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<dd><strong>readv()</strong> was not successful. The <em>errno</em> global
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variable is set to indicate the error.</dd>
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</dl>
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<br>
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<h3>Error Conditions</h3>
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<p>If <strong>readv()</strong> is not successful, <em>errno</em> usually
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indicates one of the following errors. Under some conditions, <em>errno</em>
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could indicate an error other than those listed here.</p>
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<table cellpadding="5">
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<!-- cols="25 75" -->
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<tr>
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<th align="left" valign="bottom">Error condition</th>
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<th align="left" valign="bottom">Additional information</th>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[<a href="unix14.htm#EACCES">EACCES</a>]</em></td>
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<td align="left" valign="top">
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<p>If you are accessing a remote file through the Network File System, update
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operations to file permissions at the server are not reflected at the client
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until updates to data that is stored locally by the Network File System take
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place. (Several options on the Add Mounted File System (ADDMFS) command
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determine the time between refresh operations of local data.) Access to a
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remote file may also fail due to different mappings of user IDs (UID) or group
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IDs (GID) on the local and remote systems.</p>
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<p>This may occur if <em>file_descriptor</em> refers to a socket and the socket
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is using a connection-oriented transport service, and a <em>connect()</em> was
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previously completed. The thread, however, does not have the appropriate
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privileges to the objects that were needed to establish a connection. For
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example, the <em>connect()</em> required the use of an APPC device that the
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thread was not authorized to.</p>
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EAGAIN">EAGAIN</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EBADF">EBADF</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EBADFID">EBADFID</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EBUSY">EBUSY</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EDAMAGE">EDAMAGE</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EFAULT">EFAULT</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EINTR">EINTR</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EINVAL">EINVAL</a>]</em></td>
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<td align="left" valign="top">
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<p>This may occur if <em>file_descriptor</em> refers to a socket that is using
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a connectionless transport service, is not a socket of type <samp>SOCK_RAW</samp>,
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and is not bound to an address.</p>
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<p>The file resides in a file system that does not support large files, and the
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starting offset of the file exceeds 2 GB minus 2 bytes.</p>
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EIO">EIO</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ENOMEM">ENOMEM</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ENOTAVAIL">ENOTAVAIL</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ENOTSAFE">ENOTSAFE</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EOVERFLOW">EOVERFLOW</a>]</em></td>
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<td align="left" valign="top">
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<p>The file is a regular file, <em>nbyte</em> is greater than 0, the starting
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offset is before the end-of-file and is greater than or equal to 2GB minus 2
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bytes.</p>
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ERESTART">ERESTART</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ESTALE">ESTALE</a>]</em></td>
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<td align="left" valign="top">
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<p>If you are accessing a remote file through the Network File System, the file
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may have been deleted at the server.</p>
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EUNKNOWN">EUNKNOWN</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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</table>
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<br>
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<p>When the descriptor refers to a socket, <em>errno</em> could indicate one of
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the following errors:</p>
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<table cellpadding="5">
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<!-- cols="25 75" -->
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<tr>
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<th align="left" valign="bottom">Error condition</th>
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<th align="left" valign="bottom">Additional information</th>
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</tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ECONNABORTED">ECONNABORTED</a>]</em></td>
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<td align="left" valign="top">
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<p>This error code indicates that the transport provider ended the connection
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abnormally because of one of the following:</p>
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<ul>
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<li>The retransmission limit has been reached for data that was being sent on
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the socket.</li>
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<li>A protocol error was detected.</li>
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</ul>
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ECONNREFUSED">ECONNREFUSED</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ECONNRESET">ECONNRESET</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EINTR">EINTR</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ENOTCONN">ENOTCONN</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ETIMEDOUT">ETIMEDOUT</a>]</em></td>
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<td align="left" valign="top">
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<p>A non-blocking <strong>connect()</strong> was previously completed that
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resulted in the connection timing out. No connection is established. This error
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code is returned only on sockets that use a connection-oriented transport
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service.</p>
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EUNATCH">EUNATCH</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EWOULDBLOCK">EWOULDBLOCK</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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</table>
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<br>
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<p>If interaction with a file server is required to access the object, <em>
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errno</em> could indicate one of the following errors:</p>
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<table cellpadding="5">
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<!-- cols="25 75" -->
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<tr>
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<th align="left" valign="bottom">Error condition</th>
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<th align="left" valign="bottom">Additional information</th>
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</tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EADDRNOTAVAIL">EADDRNOTAVAIL</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ECONNABORTED">ECONNABORTED</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ECONNREFUSED">ECONNREFUSED</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ECONNRESET">ECONNRESET</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EHOSTDOWN">EHOSTDOWN</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EHOSTUNREACH">EHOSTUNREACH</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ENETDOWN">ENETDOWN</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ENETRESET">ENETRESET</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ENETUNREACH">ENETUNREACH</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ESTALE">ESTALE</a>]</em></td>
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<td align="left" valign="top">
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<p>If you are accessing a remote file through the Network File System, the file
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may have been deleted at the server.</p>
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#ETIMEDOUT">ETIMEDOUT</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top"><em>[<a href="unix14.htm#EUNATCH">EUNATCH</a>]</em></td>
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<td align="left" valign="top">
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</td></tr>
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</table>
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<br>
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<br>
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<h3>Error Messages</h3>
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<table width="100%" cellpadding="5">
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<tr>
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<th align="left" valign="top">Message ID</th>
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<th align="left" valign="top">Error Message Text</th>
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</tr>
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<tr>
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<td align="left" valign="top">CPE3418 E</td>
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<td align="left" valign="top">Possible APAR condition or hardware failure.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF3CF2 E</td>
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<td align="left" valign="top">Error(s) occurred during running of &1
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API.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF9872 E</td>
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<td align="left" valign="top">Program or service program &1 in library
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&2 ended. Reason code &3.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA081 E</td>
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<td align="left" valign="top">Unable to set return value or error code.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA0D4 E</td>
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<td align="left" valign="top">File system error occurred. Error number
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&1.</td>
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</tr>
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</table>
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<br>
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<br>
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<h3><a name="USAGE_NOTES">Usage Notes</a></h3>
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<ol>
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<li>This function will fail with error code [ENOTSAFE] when all the following
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conditions are true:<br>
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<br>
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<ul>
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<li>Where multiple threads exist in the job.<br>
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</li>
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<li>The object on which this function is operating resides in a file system
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that is not threadsafe. Only the following file systems are threadsafe for this
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function:<br>
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<br>
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<ul>
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<li>"Root" (/)</li>
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<li>QOpenSys</li>
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<li>User-defined</li>
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<li>QNTC</li>
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<li>QSYS.LIB</li>
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<li>Independent ASP QSYS.LIB</li>
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<li>QOPT</li>
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<li>Network File System</li>
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<li>QFileSvr.400</li>
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</ul>
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</li>
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</ul>
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<br>
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</li>
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<li>The <em>io_vector</em>[] parameter is an array of <strong>struct
|
|
iovec</strong> structures. When a <em>readv()</em> is issued, the system
|
|
processes the array elements one at a time, starting with <em>
|
|
io_vector</em>[0]. For each element, <strong>iov_len</strong> bytes of received
|
|
data are placed in storage pointed to by <strong>iov_base</strong>. Data is
|
|
placed in storage until all buffers are full, or until there is no more data to
|
|
receive. Only the storage pointed to by <strong>iov_base</strong> is updated.
|
|
No change is made to the <strong>iov_len</strong> fields. To determine the end
|
|
of the data, the application program must use the following:<br>
|
|
<br>
|
|
<ul>
|
|
<li>The function return value (the total number of bytes received).</li>
|
|
|
|
<li>The lengths of the buffers pointed to by <strong>iov_base</strong>.</li>
|
|
</ul>
|
|
|
|
<br>
|
|
</li>
|
|
|
|
<li>For sockets that use a connection-oriented transport service (for example,
|
|
sockets with a type of <samp>SOCK_STREAM</samp>), a returned value of zero
|
|
indicates one of the following:<br>
|
|
<br>
|
|
<ul>
|
|
<li>The partner program has issued a <em>close()</em> for the socket.<br>
|
|
</li>
|
|
|
|
<li>The partner program has issued a <em>shutdown()</em> to disable writing to
|
|
the socket.<br>
|
|
</li>
|
|
|
|
<li>The connection is broken and the error was returned on a previously issued
|
|
socket function.<br>
|
|
</li>
|
|
|
|
<li>A <em>shutdown()</em> to disable reading was previously done on the
|
|
socket.</li>
|
|
</ul>
|
|
|
|
<br>
|
|
</li>
|
|
|
|
<li>The following applies to sockets that use a connectionless transport
|
|
service (for example, a socket with a type of <samp>SOCK_DGRAM</samp>):
|
|
|
|
<ul>
|
|
<li>If a <em>connect()</em> has been issued previously, then data can be
|
|
received only from the address specified in the previous <em>
|
|
connect()</em>.<br>
|
|
</li>
|
|
|
|
<li>The address from which data is received is discarded, because the <em>
|
|
readv()</em> has no address parameter.<br>
|
|
</li>
|
|
|
|
<li>The entire message must be read in a single read operation. If the size of
|
|
the message is too large to fit in the user-supplied buffers, the remaining
|
|
bytes of the message are discarded.<br>
|
|
</li>
|
|
|
|
<li>A returned value of zero indicates one of the following:
|
|
|
|
<ul>
|
|
<li>The partner program has sent a NULL message (a datagram with no user
|
|
data).<br>
|
|
</li>
|
|
|
|
<li>A <em>shutdown()</em> to disable reading was previously done on the
|
|
socket.<br>
|
|
</li>
|
|
|
|
<li>The buffer length specified by the application was zero.</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
|
|
<br>
|
|
</li>
|
|
|
|
<li>For the file systems that do not support large files, <strong>
|
|
readv()</strong> will return [EINVAL] if the starting offset exceeds 2GB minus
|
|
2 bytes, regardless of how the file was opened. For the file systems that do
|
|
support large files, <strong>readv()</strong> will return [EOVERFLOW] if the
|
|
starting offset exceeds 2GB minus 2 bytes and file was not opened for large
|
|
file access.<br>
|
|
<br>
|
|
</li>
|
|
|
|
<li>QFileSvr.400 File System Differences
|
|
|
|
<p>The largest buffer size allowed is 16 megabytes. If a larger buffer is
|
|
passed, the error EINVAL will be received.</p>
|
|
</li>
|
|
|
|
<li>QOPT File System Differences
|
|
|
|
<p>When reading from files on volumes formatted in Universal Disk Format (UDF),
|
|
byte locks on the range being read are ignored.</p>
|
|
</li>
|
|
|
|
<li>Using this function successfully on the /dev/null or /dev/zero character
|
|
special file results in a return value of 0. In addition, the access time for
|
|
the file is updated.</li>
|
|
</ol>
|
|
|
|
<br>
|
|
<h3>Related Information</h3>
|
|
|
|
<ul>
|
|
<li>The <<strong>limits.h</strong>> file (see <a href="unix13.htm">Header
|
|
Files for UNIX-Type Functions</a>)
|
|
</li>
|
|
|
|
<li>The <<strong>unistd.h</strong>> file (see <a href="unix13.htm">Header
|
|
Files for UNIX-Type Functions</a>)
|
|
</li>
|
|
|
|
<li><a href="creat.htm">creat()</a>--Create or Rewrite File
|
|
</li>
|
|
|
|
<li><a href="dup.htm">dup()</a>--Duplicate Open File Descriptor
|
|
</li>
|
|
|
|
<li><a href="dup2.htm">dup2()</a>--Duplicate Open File Descriptor to Another
|
|
Descriptor
|
|
</li>
|
|
|
|
<li><a href="fclear.htm">fclear()</a>--Write (Binary Zeros) to Descriptor
|
|
</li>
|
|
|
|
<li><a href="fclear64.htm">fclear64()</a>--Write (Binary Zeros) to Descriptor
|
|
(Large File Enabled)
|
|
</li>
|
|
|
|
<li><a href="fcntl.htm">fcntl()</a>--Perform File Control Command
|
|
</li>
|
|
|
|
<li><a href="ioctl.htm">ioctl()</a>--Perform I/O Control Request
|
|
</li>
|
|
|
|
<li><a href="lseek.htm">lseek()</a>--Set File Read/Write Offset
|
|
</li>
|
|
|
|
<li><a href="open.htm">open()</a>--Open File
|
|
</li>
|
|
|
|
<li><a href="read.htm">read()</a>--Read from Descriptor
|
|
</li>
|
|
|
|
<li><a href="recv.htm">recv()</a>--Receive Data
|
|
</li>
|
|
|
|
<li><a href="recvfr.htm">recvfrom()</a>--Receive Data
|
|
</li>
|
|
|
|
<li><a href="recvms.htm">recvmsg()</a>--Receive Data or Descriptors or Both
|
|
</li>
|
|
|
|
<li><a href="write.htm">write()</a>--Write to Descriptor
|
|
</li>
|
|
|
|
<li><a href="writev.htm">writev()</a>--Write to Descriptor Using Multiple
|
|
Buffers</li>
|
|
</ul>
|
|
|
|
<br>
|
|
<hr>
|
|
API introduced: V3R1
|
|
|
|
<hr>
|
|
<center>
|
|
<table cellpadding="2" cellspacing="2">
|
|
<tr align="center">
|
|
<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
|
|
"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
|
|
</tr>
|
|
</table>
|
|
</center>
|
|
</body>
|
|
</html>
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|
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