curl_multi_perform man page on Fedora

Man page or keyword search:  
man Server   31170 pages
apropos Keyword Search (all sections)
Output format
Fedora logo
[printable version]

curl_multi_perform(3)		libcurl Manual		 curl_multi_perform(3)

NAME
       curl_multi_perform - reads/writes available data from each easy handle

SYNOPSIS
       #include <curl/curl.h>

       CURLMcode  curl_multi_perform(CURLM  *multi_handle,  int	 *running_han‐
       dles);

DESCRIPTION
       When the app thinks there's data available  for	the  multi_handle,  it
       should  call  this  function to read/write whatever there is to read or
       write  right  now.  curl_multi_perform()	 returns  as   soon   as   the
       reads/writes  are done. This function does not require that there actu‐
       ally is any data available for reading or that data can be written,  it
       can  be	called	just in case. It will write the number of handles that
       still transfer data in the second argument's integer-pointer.

       When you call curl_multi_perform() and the amount of running_handles is
       changed from the previous call (or is less than the amount of easy han‐
       dles you've added to the multi handle), you know that there is  one  or
       more	transfers     less    "running".    You	   can	  then	  call
       curl_multi_info_read(3) to get information about each  individual  com‐
       pleted  transfer, and that returned info includes CURLcode and more. If
       an added handle fails very quickly, it may never be counted as  a  run‐
       ning_handle.

       When running_handles is set to zero (0) on the return of this function,
       there is no longer any transfers in progress.

RETURN VALUE
       CURLMcode type, general libcurl multi interface error code.

       Before version 7.20.0: If you  receive  CURLM_CALL_MULTI_PERFORM,  this
       basically  means	 that you should call curl_multi_perform again, before
       you select() on more actions. You don't have to do it immediately,  but
       the  return  code  means	 that  libcurl may have more data available to
       return or that there may be more data to send off before it is  "satis‐
       fied".	 Do    note    that    curl_multi_perform(3)	will	return
       CURLM_CALL_MULTI_PERFORM only when it wants to be called again  immedi‐
       ately.  When  things  are  fine and there is nothing immediate it wants
       done, it'll return CURLM_OK and you need to wait for "action" and  then
       call this function again.

       This  function only returns errors etc regarding the whole multi stack.
       Problems still might have occurred on individual	 transfers  even  when
       this function returns CURLM_OK.

TYPICAL USAGE
       Most  applications  will	 use curl_multi_fdset(3) to get the multi_han‐
       dle's file descriptors, then  it'll  wait  for  action  on  them	 using
       select(3) and as soon as one or more of them are ready, curl_multi_per‐
       form(3) gets called.

SEE ALSO
       curl_multi_cleanup(3),	  curl_multi_init(3),	  curl_multi_fdset(3),
       curl_multi_info_read(3), libcurl-errors(3)

libcurl 7.9.5			 1 March 2002		 curl_multi_perform(3)
[top]

List of man pages available for Fedora

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]
Tweet
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