Hi,
I'm writing an application using the libcurl multi interface with
HTTPS. The primary reason for using the multi interface is so that I
can perform multiple asynchronous operations at once within a single
threaded application. My application uses poll() so i've written a
function to transform fd_set data to something which poll() can use.
After I init my multi handle, init my easy handles, bind them, and
start I call curl_multi_fdset() to figure out which descriptors
libcurl is using. I continue to call this function periodically and
also upon certain events so that I can add/remove items from my pollfd
struct as needed. This works great.
The problem I'm running into revolves around open connections. I know
libcurl leaves sockets open for re-use in the future, I verified by
checking some of the log messages and the code. On completion of a
successful HTTPS transaction, I see this:
* Expire cleared
* Connection #0 to host 10.4.4.204 left intact
About ~10 seconds later the server sends another packet on this
socket, poll() fires, and my application calls curl_multi_perform().
I'm guessing that because the transfer is finished,
curl_multi_perform() does not perform any action on this socket as I
get stuck in this loop forever. poll() continuously fires with an
event of POLLIN and curl_multi_perform() gets called.
curl_multi_fdset() still reports the descriptor as in use at this time.
Looking at the libcurl code, it looks like sockets are only closed
upon error, or when calling curl_multi_cleanup(). My application is
always doing something with libcurl so I never actually call
curl_multi_cleanup() except on exit. I do however remove easy handles
from the multi stack, call curl_easy_cleanup(), and re-allocate easy
handles later with curl_easy_init() and add them back onto the multi
stack as needed. Is there any way that I can either:
1.) retrieve all sockets used by a specific easy handle so I can close
them manually
2.) tell libcurl to close all sockets associated with an easy handle
Or is there some other better way to solve my problem? Thanks in
advance for any ideas!
--
Chad Monroe
