curl_easy_pause man page on SmartOS

Man page or keyword search:  
man Server   16655 pages
apropos Keyword Search (all sections)
Output format
SmartOS logo
[printable version]

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

       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_WRITEFUNC_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.

       While it may feel tempting, take care and notice that you  cannot  call
       this function from another thread. To unpause, you may for example call
       it from the progress callback (see  curl_easy_setopt(3)'s  CURLOPT_PRO‐
       GRESSFUNCTION), which gets called at least once per second, even if the
       connection is paused.

       When this function is called to unpause reading,	 the  chance  is  high
       that  you  will	get  your  write  callback called before this function

       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 following 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 (CURLOPT_WRITEFUNCTION)  won't  be

	      Pause  sending  data. There will be no data sent on this connec‐
	      tion until this function is called again without this  bit  set.
	      Thus, the read callback (CURLOPT_READFUNCTION) 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.

       The pausing of transfers does not work with protocols that work without
       network connectivity, like FILE://. Trying to pause such a transfer, in
       any direction, will cause problems in the worst case or an error in the
       best case.

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

       Before  libcurl	7.32.0,	 when a specific handle was unpaused with this
       function, there was no particular forced rechecking or similar  of  the
       socket's state, which made the continuation of the transfer get delayed
       until next multi-socket call invoke or even longer. Alternatively,  the
       user  could forcibly call for example curl_multi_socket_all(3) - with a
       rather hefty performance penalty.

       Starting in libcurl 7.32.0, unpausing a transfer will schedule a	 time‐
       out  trigger  for  that handle 1 millisecond into the future, so that a
       curl_multi_socket_action( ... CURL_SOCKET_TIMEOUT) can be used  immedi‐
       ately afterwards to get the transfer going again as desired.

       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	 allo‐
       cated 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)

List of man pages available for SmartOS

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net