1curl_multi_info_read(3)         libcurl Manual         curl_multi_info_read(3)
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NAME

6       curl_multi_info_read - read multi stack informationals
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SYNOPSIS

9       #include <curl/curl.h>
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11       CURLMsg *curl_multi_info_read( CURLM *multi_handle,
12                                      int *msgs_in_queue);
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DESCRIPTION

15       Ask  the multi handle if there are any messages/informationals from the
16       individual transfers. Messages may include informationals  such  as  an
17       error  code  from the transfer or just the fact that a transfer is com‐
18       pleted. More details on these should be written down as well.
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20       Repeated calls to this function will return a  new  struct  each  time,
21       until  a  NULL  is returned as a signal that there is no more to get at
22       this point. The integer pointed to with msgs_in_queue will contain  the
23       number of remaining messages after this function was called.
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25       When  you  fetch  a message using this function, it is removed from the
26       internal queue so calling this function again will not return the  same
27       message  again.  It will instead return new messages at each new invoke
28       until the queue is emptied.
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30       WARNING: The data the returned pointer points to will not survive call‐
31       ing      curl_multi_cleanup(3),      curl_multi_remove_handle(3)     or
32       curl_easy_cleanup(3).
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34       The 'CURLMsg' struct is very simple and only contain very basic  infor‐
35       mation.   If  more involved information is wanted, the particular "easy
36       handle" in present in that struct and can thus be  used  in  subsequent
37       regular curl_easy_getinfo(3) calls (or similar):
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39        struct CURLMsg {
40          CURLMSG msg;       /* what this message means */
41          CURL *easy_handle; /* the handle it concerns */
42          union {
43            void *whatever;    /* message-specific data */
44            CURLcode result;   /* return code for transfer */
45          } data;
46        };
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48       When  msg  is  CURLMSG_DONE,  the message identifies a transfer that is
49       done, and then result contains the return code for the easy handle that
50       just completed.
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52       At this point, there is no other msg types defined.
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RETURN VALUE

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

60       curl_multi_cleanup(3), curl_multi_init(3), curl_multi_perform(3)
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64libcurl 7.10.3                    18 Dec 2004          curl_multi_info_read(3)
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