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175 lines
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<title>posix_spawnattr_destroy</title>
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<basefont size="3"> <a name="posix_spawnattr_destroy"></a> <a name="tag_03_432"></a><!-- posix_spawnattr_destroy -->
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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_432_01"></a>NAME</h4>
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<blockquote>posix_spawnattr_destroy, posix_spawnattr_init - destroy and initialize spawn attributes object (<b>ADVANCED
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REALTIME</b>)</blockquote>
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<h4><a name="tag_03_432_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_spawnattr_destroy(posix_spawnattr_t *</tt><i>attr</i><tt>);<br>
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int posix_spawnattr_init(posix_spawnattr_t *</tt><i>attr</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border=
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"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_432_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>posix_spawnattr_destroy</i>() function shall destroy a spawn attributes object. A destroyed <i>attr</i> attributes object
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can be reinitialized using <i>posix_spawnattr_init</i>(); the results of otherwise referencing the object after it has been
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destroyed are undefined. An implementation may cause <i>posix_spawnattr_destroy</i>() to set the object referenced by <i>attr</i>
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to an invalid value.</p>
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<p>The <i>posix_spawnattr_init</i>() function shall initialize a spawn attributes object <i>attr</i> with the default value for all
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of the individual attributes used by the implementation. Results are undefined if <i>posix_spawnattr_init</i>() is called
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specifying an already initialized <i>attr</i> attributes object.</p>
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<p>A spawn attributes object is of type <b>posix_spawnattr_t</b> (defined in <a href=
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"../basedefs/spawn.h.html"><i><spawn.h></i></a>) and is used to specify the inheritance of process attributes across a spawn
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operation. IEEE Std 1003.1-2001 does not define comparison or assignment operators for the type
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<b>posix_spawnattr_t</b>.</p>
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<p>Each implementation shall document the individual attributes it uses and their default values unless these values are defined by
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IEEE Std 1003.1-2001. Attributes not defined by IEEE Std 1003.1-2001, their default values, and the names of
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the associated functions to get and set those attribute values are implementation-defined.</p>
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<p>The resulting spawn attributes object (possibly modified by setting individual attribute values), is used to modify the behavior
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of <a href="../functions/posix_spawn.html"><i>posix_spawn</i>()</a> or <a href=
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"../functions/posix_spawnp.html"><i>posix_spawnp</i>()</a>. After a spawn attributes object has been used to spawn a process by a
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call to a <a href="../functions/posix_spawn.html"><i>posix_spawn</i>()</a> or <a href=
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"../functions/posix_spawnp.html"><i>posix_spawnp</i>()</a>, any function affecting the attributes object (including destruction)
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shall not affect any process that has been spawned in this way.</p>
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</blockquote>
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<h4><a name="tag_03_432_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>posix_spawnattr_destroy</i>() and <i>posix_spawnattr_init</i>() shall return zero; otherwise, an
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error number shall be returned to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_432_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>posix_spawnattr_init</i>() function shall fail if:</p>
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<dl compact>
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<dt>[ENOMEM]</dt>
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<dd>Insufficient memory exists to initialize the spawn attributes object.</dd>
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</dl>
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<p>The <i>posix_spawnattr_destroy</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 attr is invalid.</dd>
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</dl>
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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_432_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_432_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>These functions are part of the Spawn option and need not be provided on all implementations.</p>
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</blockquote>
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<h4><a name="tag_03_432_08"></a>RATIONALE</h4>
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<blockquote>
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<p>The original spawn interface proposed in IEEE Std 1003.1-2001 defined the attributes that specify the inheritance of
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process attributes across a spawn operation as a structure. In order to be able to separate optional individual attributes under
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their appropriate options (that is, the <i>spawn-schedparam</i> and <i>spawn-schedpolicy</i> attributes depending upon the Process
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Scheduling option), and also for extensibility and consistency with the newer POSIX interfaces, the attributes interface has been
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changed to an opaque data type. This interface now consists of the type <b>posix_spawnattr_t</b>, representing a spawn attributes
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object, together with associated functions to initialize or destroy the attributes object, and to set or get each individual
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attribute. Although the new object-oriented interface is more verbose than the original structure, it is simple to use, more
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extensible, and easy to implement.</p>
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</blockquote>
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<h4><a name="tag_03_432_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_432_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="posix_spawn.html"><i>posix_spawn</i>()</a> , <a href=
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"posix_spawnattr_getsigdefault.html"><i>posix_spawnattr_getsigdefault</i>()</a> , <a href=
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"posix_spawnattr_getflags.html"><i>posix_spawnattr_getflags</i>()</a> , <a href=
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"posix_spawnattr_getpgroup.html"><i>posix_spawnattr_getpgroup</i>()</a> , <a href=
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"posix_spawnattr_getschedparam.html"><i>posix_spawnattr_getschedparam</i>()</a> , <a href=
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"posix_spawnattr_getschedpolicy.html"><i>posix_spawnattr_getschedpolicy</i>()</a> , <a href=
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"posix_spawnattr_getsigmask.html"><i>posix_spawnattr_getsigmask</i>()</a> , <a href=
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"posix_spawnattr_setsigdefault.html"><i>posix_spawnattr_setsigdefault</i>()</a> , <a href=
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"posix_spawnattr_setflags.html"><i>posix_spawnattr_setflags</i>()</a> , <a href=
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"posix_spawnattr_setpgroup.html"><i>posix_spawnattr_setpgroup</i>()</a> , <a href=
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"posix_spawnattr_setsigmask.html"><i>posix_spawnattr_setsigmask</i>()</a> , <a href=
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"posix_spawnattr_setschedpolicy.html"><i>posix_spawnattr_setschedpolicy</i>()</a> , <a href=
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"posix_spawnattr_setschedparam.html"><i>posix_spawnattr_setschedparam</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_432_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 #106 is applied, noting that the effect of initializing an already initialized spawn attributes
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option is undefined.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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