curl/docs/libcurl/curl_multi_info_read.3

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.TH curl_multi_info_read 3 "18 Dec 2004" "libcurl 7.10.3" "libcurl Manual"
.SH NAME
curl_multi_info_read - read multi stack informationals
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLMsg *curl_multi_info_read(CURLM *multi_handle, int *msgs_in_queue);
.fi
.SH DESCRIPTION
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 \fImsgs_in_queue\fP 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.

\fBWARNING:\fP The data the returned pointer points to will not survive
calling \fIcurl_multi_cleanup(3)\fP, \fIcurl_multi_remove_handle(3)\fP or
\fIcurl_easy_cleanup(3)\fP.

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

.nf
 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;
 };
.fi
When \fBmsg\fP is \fICURLMSG_DONE\fP, the message identifies a transfer that
is done, and then \fBresult\fP contains the return code for the easy handle
that just completed.

At this point, there are no other \fBmsg\fP types defined.
.SH EXAMPLE
.nf
struct CURLMsg *m;

/* call curl_multi_perform or curl_multi_socket_action first, then loop
   through and check if there are any transfers that have completed */

do {
  int msgq = 0;
  m = curl_multi_info_read(multi_handle, &msgq);
  if(m && (m->msg == CURLMSG_DONE)) {
    CURL *e = m->easy_handle;
    transfers--;
    curl_multi_remove_handle(multi_handle, e);
    curl_easy_cleanup(e);
  }
} while(m);
.fi
.SH AVAILABILITY
Added in 7.9.6
.SH RETURN VALUE
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.
.SH "SEE ALSO"
.BR curl_multi_cleanup "(3), " curl_multi_init "(3), " curl_multi_perform "(3)"