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CentOS 7.0 - man page for curl_easy_pause (centos section 3)

curl_easy_pause(3)			  libcurl Manual		       curl_easy_pause(3)

       curl_easy_pause - pause and unpause a connection

       #include <curl/curl.h>

       CURLcode curl_easy_pause(CURL *handle, int bitmask );

       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:

	      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.

	      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.

	      Convenience define that pauses both directions.

	      Convenience define that unpauses both directions

       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.

       This function was added in libcurl 7.18.0. Before this version, there was no explicit sup-
       port for pausing transfers.

       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.

       curl_easy_cleanup(3), curl_easy_reset(3)

libcurl 7.18.0				   17 Dec 2007			       curl_easy_pause(3)

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