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curl_multi_info_read(3)         libcurl Manual         curl_multi_info_read(3)

       curl_multi_info_read - read multi stack informationals

       #include <curl/curl.h>

       CURLMsg *curl_multi_info_read( CURLM *multi_handle,
                                      int *msgs_in_queue);

       Ask  the  multi  handle  if  there  are any messages/informationals from the individual transfers. Messages may
       include informationals such as an error code from the transfer or just the fact that a transfer  is  completed.
       More details on these should be written down as well.

       Repeated  calls  to this function will return a new struct each time, until a NULL is returned as a signal that
       there is no more to get at this point. The integer pointed to with msgs_in_queue will  contain  the  number  of
       remaining messages after this function was called.

       When  you  fetch  a message using this function, it is removed from the internal queue so calling this function
       again will not return the same message again. It will instead return new messages at each new invoke until  the
       queue is emptied.

       WARNING:   The   data   the  returned  pointer  points  to  will  not  survive  calling  curl_multi_cleanup(3),
       curl_multi_remove_handle(3) or curl_easy_cleanup(3).

       The 'CURLMsg' struct is very simple and only contains very basic information.  If more involved information  is
       wanted,  the  particular  "easy  handle"  in  present in that struct and can thus be used in subsequent regular
       curl_easy_getinfo(3) calls (or similar):

        struct CURLMsg {
          CURLMSG msg;       /* what this message means */
          CURL *easy_handle; /* the handle it concerns */
          union {
            void *whatever;    /* message-specific data */
            CURLcode result;   /* return code for transfer */
          } data;
       When msg is CURLMSG_DONE, the message identifies a transfer that is done, and then result contains  the  return
       code for the easy handle that just completed.

       At this point, there are no other msg types defined.

       A  pointer to a filled-in struct, or NULL if it failed or ran out of structs. It also writes the number of mes-
       sages left in the queue (after this read) in the integer the second argument points to.

       curl_multi_cleanup(3), curl_multi_init(3), curl_multi_perform(3)

libcurl 7.10.3                    18 Dec 2004          curl_multi_info_read(3)