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+.\" $Id: curl_multi_fdset.3,v 1.15 2010-01-26 23:02:13 bagder Exp $
+.\"
+.TH curl_multi_fdset 3 "2 Jan 2006" "libcurl 7.16.0" "libcurl Manual"
+.SH NAME
+curl_multi_fdset - extracts file descriptor information from a multi handle
+.SH SYNOPSIS
+.nf
+#include <curl/curl.h>
+
+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);
+.ad
+.SH DESCRIPTION
+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
+\fIcurl_multi_fdset(3)\fP only adds its own descriptors, it doesn't zero or
+otherwise remove any others. The \fIcurl_multi_perform(3)\fP function should be
+called as soon as one of them is ready to be read from or written to.
+
+To be sure to have up-to-date results, you should call
+\fIcurl_multi_perform\fP until it does not return CURLM_CALL_MULTI_PERFORM
+prior to calling \fIcurl_multi_fdset\fP.  This will make sure that libcurl has
+updated the handles' socket states.
+
+If no file descriptors are set by libcurl, \fImax_fd\fP will contain -1 when
+this function returns. Otherwise it will contain the higher descriptor number
+libcurl set.
+
+When doing select(), you should use \fBcurl_multi_timeout\fP to figure out how
+long to wait for action. Call \fIcurl_multi_perform\fP 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.
+.SH RETURN VALUE
+CURLMcode type, general libcurl multi interface error code. See
+\fIlibcurl-errors(3)\fP
+.SH "SEE ALSO"
+.BR curl_multi_cleanup "(3), " curl_multi_init "(3), "
+.BR curl_multi_timeout "(3), " curl_multi_perform "(3) "