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curl_multi_fdset(3)		libcurl Manual		   curl_multi_fdset(3)

NAME
       curl_multi_fdset	 -  extracts  file descriptor information from a multi
       handle

SYNOPSIS
       #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);

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  curl_multi_fdset(3)  only	adds  its  own	descriptors it
       doesn't zero or otherwise remove any other.  The	 curl_multi_perform(3)
       function	 should	 be called as soon as one of them are ready to be read
       from or written to.

       If no file descriptors are set by libcurl, max_fd will contain -1  when
       this  function returns. Otherwise it will contain the higher descriptor
       number libcurl set.

       You should also be aware that when doing select(), you should  consider
       using  a rather small (single-digit number of seconds) timeout and call
       curl_multi_perform regularly - even if no activity has been seen on the
       fd_sets	-  as  otherwise libcurl-internal retries and timeouts may not
       work as you'd think and want.

       Starting with libcurl 7.16.0, you should use curl_multi_timeout to fig‐
       ure out how long to wait for action.

RETURN VALUE
       CURLMcode  type,	 general  libcurl  multi  interface  error  code.  See
       libcurl-errors(3)

SEE ALSO
       curl_multi_cleanup(3),curl_multi_init(3), curl_multi_timeout(3)

libcurl 7.16.0			  2 Jan 2006		   curl_multi_fdset(3)
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