curl_multi_fdset man page on OpenBSD

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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 others. The	 curl_multi_perform(3)
       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  curl_multi_per-
       form until it does not return CURLM_CALL_MULTI_PERFORM prior to calling
       curl_multi_fdset.  This will make sure that  libcurl  has  updated  the
       handles' socket states.

       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.

       When  doing  select(),  you should use curl_multi_timeout to figure out
       how long to wait for action. Call curl_multi_perform even if no	activ-
       ity 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.

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),
       curl_multi_perform(3)

libcurl 7.16.0		    2 Jan 2006				1

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