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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>posix_spawn_file_actions_adddup2</title>
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<basefont size="3"> <a name="posix_spawn_file_actions_adddup2"></a> <a name="tag_03_429"></a>
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<!-- posix_spawn_file_actions_adddup2 -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_429_01"></a>NAME</h4>
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<blockquote>posix_spawn_file_actions_adddup2 - add dup2 action to spawn file actions object (<b>ADVANCED REALTIME</b>)</blockquote>
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<h4><a name="tag_03_429_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('SPN')">SPN</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/spawn.h.html">spawn.h</a>><br>
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<br>
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int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *<br>
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</tt> <i>file_actions</i><tt>, int</tt> <i>fildes</i><tt>, int</tt> <i>newfildes</i><tt>);
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<img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_429_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>posix_spawn_file_actions_adddup2</i>() function shall add a <a href="../functions/dup2.html"><i>dup2</i>()</a> action to
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the object referenced by <i>file_actions</i> that shall cause the file descriptor <i>fildes</i> to be duplicated as
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<i>newfildes</i> (as if <i>dup2</i>( <i>fildes</i>, <i>newfildes</i>) had been called) when a new process is spawned using this
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file actions object.</p>
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<p>A spawn file actions object is as defined in <a href=
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"posix_spawn_file_actions_addclose.html"><i>posix_spawn_file_actions_addclose</i>()</a> .</p>
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</blockquote>
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<h4><a name="tag_03_429_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, the <i>posix_spawn_file_actions_adddup2</i>() function shall return zero; otherwise, an error number
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shall be returned to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_429_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>posix_spawn_file_actions_adddup2</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EBADF]</dt>
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<dd>The value specified by <i>fildes</i> or <i>newfildes</i> is negative or greater than or equal to {OPEN_MAX}.</dd>
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<dt>[ENOMEM]</dt>
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<dd>Insufficient memory exists to add to the spawn file actions object.</dd>
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</dl>
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<p>The <i>posix_spawn_file_actions_adddup2</i>() function may fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The value specified by <i>file_actions</i> is invalid.</dd>
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</dl>
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<p>It shall not be considered an error for the <i>fildes</i> argument passed to the <i>posix_spawn_file_actions_adddup2</i>()
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function to specify a file descriptor for which the specified operation could not be performed at the time of the call. Any such
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error will be detected when the associated file actions object is later used during a <a href=
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"../functions/posix_spawn.html"><i>posix_spawn</i>()</a> or <a href="../functions/posix_spawnp.html"><i>posix_spawnp</i>()</a>
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operation.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_429_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_429_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The <i>posix_spawn_file_actions_adddup2</i>() function is part of the Spawn option and need not be provided on all
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implementations.</p>
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</blockquote>
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<h4><a name="tag_03_429_08"></a>RATIONALE</h4>
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<blockquote>
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<p>Refer to the RATIONALE in <a href="posix_spawn_file_actions_addclose.html"><i>posix_spawn_file_actions_addclose</i>()</a> .</p>
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</blockquote>
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<h4><a name="tag_03_429_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_429_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="dup.html"><i>dup</i>()</a> , <a href="posix_spawn.html"><i>posix_spawn</i>()</a> , <a href=
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"posix_spawn_file_actions_addclose.html"><i>posix_spawn_file_actions_addclose</i>()</a> , <a href=
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"posix_spawn_file_actions_destroy.html"><i>posix_spawn_file_actions_destroy</i>()</a> , <a href=
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"posix_spawnp.html"><i>posix_spawnp</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/spawn.h.html"><i><spawn.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_429_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 6. Derived from IEEE Std 1003.1d-1999.</p>
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<p>IEEE PASC Interpretation 1003.1 #104 is applied, noting that the [EBADF] error can apply to the <i>newfildes</i> argument in
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addition to <i>fildes</i>.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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