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a CURLOPT_PROGRESSFUNCTION clarification

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Daniel Stenberg 2006-08-02 09:33:32 +00:00
parent ee642859ef
commit fbcdc192d5
1 changed files with 6 additions and 5 deletions
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11
docs/libcurl/curl_easy_setopt.3
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@ -169,11 +169,12 @@ added in 7.12.3)
.IP CURLOPT_PROGRESSFUNCTION
Function pointer that should match the \fIcurl_progress_callback\fP prototype
found in \fI<curl/curl.h>\fP. This function gets called by libcurl instead of
its internal equivalent with a frequent interval during data transfer (roughly
once per second). Unknown/unused argument values pass to the callback will be
set to zero (like if you only download data, the upload size will remain
0). Returning a non-zero value from this callback will cause libcurl to abort
the transfer and return \fICURLE_ABORTED_BY_CALLBACK\fP.
its internal equivalent with a frequent interval during operation (roughly
once per second) no matter if data is being transfered or not. Unknown/unused
argument values passed to the callback will be set to zero (like if you only
download data, the upload size will remain 0). Returning a non-zero value from
this callback will cause libcurl to abort the transfer and return
\fICURLE_ABORTED_BY_CALLBACK\fP.
If you transfer data with the multi interface, this function will not be
called during periods of idleness unless you call the appropriate libcurl