curl_multi_info_read man page on Archlinux

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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 com‐
       pleted. 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 call‐
       ing	curl_multi_cleanup(3),	    curl_multi_remove_handle(3)	    or

       The 'CURLMsg' struct is very simple and only contains very basic infor‐
       mation.	 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 messages 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)

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