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| <a name="File-Caching"></a> |
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| <a name="File-caching"></a> |
| <h3 class="section">2.16 File caching</h3> |
| <p>The file caching mechanism is embedded within BFD and allows |
| the application to open as many BFDs as it wants without |
| regard to the underlying operating system’s file descriptor |
| limit (often as low as 20 open files). The module in |
| <code>cache.c</code> maintains a least recently used list of |
| <code>bfd_cache_max_open</code> files, and exports the name |
| <code>bfd_cache_lookup</code>, which runs around and makes sure that |
| the required BFD is open. If not, then it chooses a file to |
| close, closes it and opens the one wanted, returning its file |
| handle. |
| </p> |
| <a name="Caching-functions"></a> |
| <h4 class="subsection">2.16.1 Caching functions</h4> |
| |
| |
| <a name="index-bfd_005fcache_005finit"></a> |
| <a name="bfd_005fcache_005finit"></a> |
| <h4 class="subsubsection">2.16.1.1 <code>bfd_cache_init</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">bfd_boolean bfd_cache_init (bfd *abfd); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| Add a newly opened BFD to the cache. |
| </p> |
| <a name="index-bfd_005fcache_005fclose"></a> |
| <a name="bfd_005fcache_005fclose"></a> |
| <h4 class="subsubsection">2.16.1.2 <code>bfd_cache_close</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">bfd_boolean bfd_cache_close (bfd *abfd); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| Remove the BFD <var>abfd</var> from the cache. If the attached file is open, |
| then close it too. |
| </p> |
| <p><strong>Returns</strong><br> |
| <code>FALSE</code> is returned if closing the file fails, <code>TRUE</code> is |
| returned if all is well. |
| </p> |
| <a name="index-bfd_005fcache_005fclose_005fall"></a> |
| <a name="bfd_005fcache_005fclose_005fall"></a> |
| <h4 class="subsubsection">2.16.1.3 <code>bfd_cache_close_all</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">bfd_boolean bfd_cache_close_all (void); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| Remove all BFDs from the cache. If the attached file is open, |
| then close it too. |
| </p> |
| <p><strong>Returns</strong><br> |
| <code>FALSE</code> is returned if closing one of the file fails, <code>TRUE</code> is |
| returned if all is well. |
| </p> |
| <a name="index-bfd_005fopen_005ffile"></a> |
| <a name="bfd_005fopen_005ffile"></a> |
| <h4 class="subsubsection">2.16.1.4 <code>bfd_open_file</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">FILE* bfd_open_file (bfd *abfd); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| Call the OS to open a file for <var>abfd</var>. Return the <code>FILE *</code> |
| (possibly <code>NULL</code>) that results from this operation. Set up the |
| BFD so that future accesses know the file is open. If the <code>FILE *</code> |
| returned is <code>NULL</code>, then it won’t have been put in the |
| cache, so it won’t have to be removed from it. |
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