Provided by: libcurl4-openssl-dev_7.22.0-3ubuntu4_amd64 bug

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_perform 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 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.

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)