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<html lang="en">
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<title>Closure Example - libffi</title>
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<p>
Previous:&nbsp;<a rel="previous" accesskey="p" href="The-Closure-API.html#The-Closure-API">The Closure API</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Using-libffi.html#Using-libffi">Using libffi</a>
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<h3 class="section">2.6 Closure Example</h3>

<p>A trivial example that creates a new <code>puts</code> by binding
<code>fputs</code> with <code>stdin</code>.

<pre class="example">     #include &lt;stdio.h&gt;
     #include &lt;ffi.h&gt;
     
     /* Acts like puts with the file given at time of enclosure. */
     void puts_binding(ffi_cif *cif, unsigned int *ret, void* args[],
                       FILE *stream)
     {
       *ret = fputs(*(char **)args[0], stream);
     }
     
     int main()
     {
       ffi_cif cif;
       ffi_type *args[1];
       ffi_closure *closure;
     
       int (*bound_puts)(char *);
       int rc;
     
       /* Allocate closure and bound_puts */
       closure = ffi_closure_alloc(sizeof(ffi_closure), &amp;bound_puts);
     
       if (closure)
         {
           /* Initialize the argument info vectors */
           args[0] = &amp;ffi_type_pointer;
     
           /* Initialize the cif */
           if (ffi_prep_cif(&amp;cif, FFI_DEFAULT_ABI, 1,
                            &amp;ffi_type_uint, args) == FFI_OK)
             {
               /* Initialize the closure, setting stream to stdout */
               if (ffi_prep_closure_loc(closure, &amp;cif, puts_binding,
                                        stdout, bound_puts) == FFI_OK)
                 {
                   rc = bound_puts("Hello World!");
                   /* rc now holds the result of the call to fputs */
                 }
             }
         }
     
       /* Deallocate both closure, and bound_puts */
       ffi_closure_free(closure);
     
       return 0;
     }
     
</pre>
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