84 lines
3.6 KiB
Plaintext
84 lines
3.6 KiB
Plaintext
These are problems known to exist at the time of this release. Feel free to
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join in and help us correct one or more of these! Also be sure to check the
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changelog of the current development status, as one or more of these problems
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may have been fixed since this was written!
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* Running 'make test' on Mac OS X gives 4 errors. This seems to be related
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to some kind of libtool problem:
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http://curl.haxx.se/mail/archive-2002-03/0029.html and
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http://curl.haxx.se/mail/archive-2002-03/0033.html
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* libcurl does not deal nicely with files larger than 2GB
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* GOPHER transfers seem broken
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* If a HTTP server responds to a HEAD request and includes a body (thus
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violating the RFC2616), curl won't wait to read the response but just stop
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reading and return back. If a second request (let's assume a GET) is then
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immediately made to the same server again, the connection will be re-used
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fine of course, and the second request will be sent off but when the
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response is to get read, the previous response-body is what curl will read
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and havoc is what happens.
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More details on this is found in this libcurl mailing list thread:
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http://curl.haxx.se/mail/lib-2002-08/0000.html
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------------------------------------------------------------------------------
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Q: My program blows up when I run lots of curl_easy_perform() calls on a
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single thread
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Q: My program dies when a single thread re-enters the win32 select() call
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via curl_easy_perform()
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Q: --- add your own flavour here ---
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Single Threaded Re-Entracy
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--------------------------
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There is a glitch / trick to using cURL on Win32 related to re-entrancy.
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This experience was gained on verion 7.9.4 using Windows NT SP3 in a banking
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environment (just in case you wanted to know).
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If you have already called curl_easy_perform(), and *somehow* you cause your
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single thread of execution to make another call to curl_easy_perform() - the
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windows socket() call used to create a new socket for the second connection
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can return with 10044 / 10043 error codes.
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The WSA errors we experienced are:
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WSAEPROTONOSUPPORT
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(10043)
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Protocol not supported.
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The requested protocol has not been configured into the system, or no
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implementation for it exists. For example, a socket call requests a
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SOCK_DGRAM socket, but specifies a stream protocol.
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WSAESOCKTNOSUPPORT
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(10044)
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Socket type not supported.
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The support for the specified socket type does not exist in this address
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family. For example, the optional type SOCK_RAW might be selected in a
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socket call, and the implementation does not support SOCK_RAW sockets at
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all.
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We have experienced this by creating a timer that ticks every 20ms, and on
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the tick making a curl_easy_perform() call. The call usually completed in
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about 300ms. And we expected (before this test) that the timer would NOT be
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fired during a call to curl_easy_perform(), howvever, while the first
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curl_easy_perform() is running a tick *is* fired by the windows API somehow,
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and we then call curl_easy_perform() again - thus single threaded
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re-entrancy is achieved.
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Notes:
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* We made sure that a new CURL structure was being used for each
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curl_easy_perform() request, and that the curl_global_init() had been called
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beforehand.
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* I'm happy to answer any questions about this problem to try to track it
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down.
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* Once the socket() call started failing, there is no hope - it never works
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again.
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* Slowing the timer down to give each request enough time to complete solves
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this problem completely.
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If anyone has the source code to the WinNT implementation of socket() and
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can figure out WHY this can occur, more tracing can be performed.
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John Clayton <John.Clayton at barclayscapital.com>
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