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58 lines
2.3 KiB
Groff
58 lines
2.3 KiB
Groff
.\" $Id$
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.\"
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.TH curl_multi_info_read 3 "18 Dec 2004" "libcurl 7.10.3" "libcurl Manual"
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.SH NAME
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curl_multi_info_read - read multi stack informationals
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLMsg *curl_multi_info_read( CURLM *multi_handle,
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int *msgs_in_queue);
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.ad
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.SH DESCRIPTION
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Ask the multi handle if there are any messages/informationals from the
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individual transfers. Messages may include informationals such as an error
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code from the transfer or just the fact that a transfer is completed. More
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details on these should be written down as well.
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Repeated calls to this function will return a new struct each time, until a
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NULL is returned as a signal that there is no more to get at this point. The
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integer pointed to with \fImsgs_in_queue\fP will contain the number of
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remaining messages after this function was called.
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When you fetch a message using this function, it is removed from the internal
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queue so calling this function again will not return the same message
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again. It will instead return new messages at each new invoke until the queue
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is emptied.
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\fBWARNING:\fP The data the returned pointer points to will not survive
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calling \fIcurl_multi_cleanup(3)\fP, \fIcurl_multi_remove_handle(3)\fP or
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\fIcurl_easy_cleanup(3)\fP.
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The 'CURLMsg' struct is very simple and only contains very basic information.
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If more involved information is wanted, the particular "easy handle" in
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present in that struct and can thus be used in subsequent regular
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\fIcurl_easy_getinfo(3)\fP calls (or similar):
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.nf
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struct CURLMsg {
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CURLMSG msg; /* what this message means */
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CURL *easy_handle; /* the handle it concerns */
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union {
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void *whatever; /* message-specific data */
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CURLcode result; /* return code for transfer */
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} data;
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};
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.fi
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When \fBmsg\fP is \fICURLMSG_DONE\fP, the message identifies a transfer that
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is done, and then \fBresult\fP contains the return code for the easy handle
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that just completed.
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At this point, there are no other \fBmsg\fP types defined.
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.SH "RETURN VALUE"
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A pointer to a filled-in struct, or NULL if it failed or ran out of
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structs. It also writes the number of messages left in the queue (after this
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read) in the integer the second argument points to.
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.SH "SEE ALSO"
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.BR curl_multi_cleanup "(3), " curl_multi_init "(3), " curl_multi_perform "(3)"
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