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<title>curl_multi_fdset man page</title>
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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">curl_multi_fdset - extracts file descriptor information from a multi handle <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0"><pre>
<p class="level0">#include <curl/curl.h>
<p class="level0">CURLMcode curl_multi_fdset(CURLM *multi_handle,
fd_set *read_fd_set,
fd_set *write_fd_set,
fd_set *exc_fd_set,
int *max_fd);
<p class="level0"></pre>
<a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0">This function extracts file descriptor information from a given multi_handle. libcurl returns its fd_set sets. The application can use these to select() on, but be sure to FD_ZERO them before calling this function as <a class="emphasis" href="./curl_multi_fdset.html">curl_multi_fdset(3)</a> only adds its own descriptors, it doesn't zero or otherwise remove any others. The <a class="emphasis" href="./curl_multi_perform.html">curl_multi_perform(3)</a> function should be called as soon as one of them is ready to be read from or written to.
<p class="level0">To be sure to have up-to-date results, you should call <span Class="emphasis">curl_multi_perform</span> until it does not return CURLM_CALL_MULTI_PERFORM prior to calling <span Class="emphasis">curl_multi_fdset</span>. This will make sure that libcurl has updated the handles' socket states.
<p class="level0">If no file descriptors are set by libcurl, <span Class="emphasis">max_fd</span> will contain -1 when this function returns. Otherwise it will contain the higher descriptor number libcurl set.
<p class="level0">When doing select(), you should use <span Class="bold">curl_multi_timeout</span> to figure out how long to wait for action. Call <span Class="emphasis">curl_multi_perform</span> even if no activity has been seen on the fd_sets after the timeout expires as otherwise internal retries and timeouts may not work as you'd think and want. <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0">CURLMcode type, general libcurl multi interface error code. See <span Class="emphasis">libcurl-errors(3)</span> <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
<p class="level0"><a class="manpage" href="./curl_multi_cleanup.html">curl_multi_cleanup (3)</a> <a class="manpage" href="./curl_multi_init.html"> curl_multi_init (3)</a> <span Class="manpage"> </span> <a class="manpage" href="./curl_multi_timeout.html">curl_multi_timeout (3)</a> <a class="manpage" href="./curl_multi_perform.html"> curl_multi_perform (3) </a> <p class="roffit">
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