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curl_easy_pause(3) libcurl Manual curl_easy_pause(3)
NAME
curl_easy_pause - pause and unpause a connection
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_pause(CURL *handle, int bitmask );
DESCRIPTION
Using this function, you can explicitly mark a running connection to get paused, and you
can unpause a connection that was previously paused.
A connection can be paused by using this function or by letting the read or the write
callbacks return the proper magic return code (CURL_READFUNC_PAUSE and CURL_WRITE-
FUNC_PAUSE). A write callback that returns pause signals to the library that it couldn't
take care of any data at all, and that data will then be delivered again to the callback
when the writing is later unpaused.
NOTE: while it may feel tempting, take care and notice that you cannot call this function
from another thread.
When this function is called to unpause reading, the chance is high that you will get your
write callback called before this function returns.
The handle argument is of course identifying the handle that operates on the connection
you want to pause or unpause.
The bitmask argument is a set of bits that sets the new state of the connection. The fol-
lowing bits can be used:
CURLPAUSE_RECV
Pause receiving data. There will be no data received on this connection until this
function is called again without this bit set. Thus, the write callback (CUR-
LOPT_WRITEFUNCTION) won't be called.
CURLPAUSE_SEND
Pause sending data. There will be no data sent on this connection until this func-
tion is called again without this bit set. Thus, the read callback (CURLOPT_READ-
FUNCTION) won't be called.
CURLPAUSE_ALL
Convenience define that pauses both directions.
CURLPAUSE_CONT
Convenience define that unpauses both directions
RETURN VALUE
CURLE_OK (zero) means that the option was set properly, and a non-zero return code means
something wrong occurred after the new state was set. See the libcurl-errors(3) man page
for the full list with descriptions.
AVAILABILITY
This function was added in libcurl 7.18.0. Before this version, there was no explicit sup-
port for pausing transfers.
MEMORY USE
When pausing a read by returning the magic return code from a write callback, the read
data is already in libcurl's internal buffers so it'll have to keep it in an allocated
buffer until the reading is again unpaused using this function.
If the downloaded data is compressed and is asked to get uncompressed automatically on
download, libcurl will continue to uncompress the entire downloaded chunk and it will
cache the data uncompressed. This has the side- effect that if you download something that
is compressed a lot, it can result in a very large data amount needing to be allocated to
save the data during the pause. This said, you should probably consider not using paused
reading if you allow libcurl to uncompress data automatically.
SEE ALSO
curl_easy_cleanup(3), curl_easy_reset(3)
libcurl 7.18.0 17 Dec 2007 curl_easy_pause(3)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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