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<title>Type Example (libffi: the portable foreign function interface library)</title>
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<div class="subsection" id="Type-Example">
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<p>
Next: <a href="Complex.html" accesskey="n" rel="next">Complex Types</a>, Previous: <a href="Arrays-Unions-Enums.html" accesskey="p" rel="prev">Arrays, Unions, and Enumerations</a>, Up: <a href="Types.html" accesskey="u" rel="up">Types</a> [<a href="Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
<span id="Type-Example-1"></span><h4 class="subsection">2.3.5 Type Example</h4>
<p>The following example initializes a <code>ffi_type</code> object
representing the <code>tm</code> struct from Linux’s <samp>time.h</samp>.
</p>
<p>Here is how the struct is defined:
</p>
<div class="example">
<pre class="example">struct tm {
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
/* Those are for future use. */
long int __tm_gmtoff__;
__const char *__tm_zone__;
};
</pre></div>
<p>Here is the corresponding code to describe this struct to
<code>libffi</code>:
</p>
<div class="example">
<pre class="example"> {
ffi_type tm_type;
ffi_type *tm_type_elements[12];
int i;
tm_type.size = tm_type.alignment = 0;
tm_type.type = FFI_TYPE_STRUCT;
tm_type.elements = &tm_type_elements;
for (i = 0; i < 9; i++)
tm_type_elements[i] = &ffi_type_sint;
tm_type_elements[9] = &ffi_type_slong;
tm_type_elements[10] = &ffi_type_pointer;
tm_type_elements[11] = NULL;
/* tm_type can now be used to represent tm argument types and
return types for ffi_prep_cif() */
}
</pre></div>
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