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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.

       If  no file descriptors are set by libcurl, max_fd will contain -1 when this function returns. Other-wise Otherwise
       wise 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 (singledigit
       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 figure 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)