2002-03-04 05:09:48 -05:00
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.\" $Id$
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.\"
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.TH curl_multi_perform 3 "1 March 2002" "libcurl 7.9.5" "libcurl Manual"
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.SH NAME
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2002-10-15 04:39:30 -04:00
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curl_multi_perform - reads/writes available data from each easy handle
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2002-03-04 05:09:48 -05:00
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles);
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.ad
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.SH DESCRIPTION
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When the app thinks there's data available for the multi_handle, it should
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call this function to read/write whatever there is to read or write right
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now. curl_multi_perform() returns as soon as the reads/writes are done. This
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function does not require that there actually is any data available for
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reading or that data can be written, it can be called just in case. It will
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write the number of handles that still transfer data in the second argument's
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integer-pointer.
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.SH "RETURN VALUE"
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CURLMcode type, general libcurl multi interface error code.
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2002-12-03 07:40:12 -05:00
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If you receive \fICURLM_CALL_MULTI_PERFORM\fP, this basicly means that you
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should call \fIcurl_multi_perform\fP again, before you select() on more
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actions. You don't have to do it immediately, but the return code means that
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libcurl may have more data available to return or that there may be more data
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to send off before it is "satisfied".
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2002-03-04 05:09:48 -05:00
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NOTE that this only returns errors etc regarding the whole multi stack. There
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might still have occurred problems on invidual transfers even when this
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function returns OK.
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.SH "TYPICAL USAGE"
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Most application will use \fIcurl_multi_fdset\fP to get the multi_handle's
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file descriptors, then it'll wait for action on them using select() and as
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soon as one or more of them are ready, \fIcurl_multi_perform\fP gets called.
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.SH "SEE ALSO"
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.BR curl_multi_cleanup "(3)," curl_multi_init "(3)"
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