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authorMike Giancola <mikegiancola@gmail.com>2013-05-22 23:08:27 +0200
committerDaniel Stenberg <daniel@haxx.se>2013-05-22 23:08:27 +0200
commite58d9c87f783334b01310260e0cf5220c338c58c (patch)
tree9f480c36c4adb0dfe57e1c3485d810b5c483ae51 /docs/libcurl/curl_multi_assign.3
parent84f799147431a15d1efc86654950408120adad22 (diff)
ossl_send: SSL_write() returning 0 is an error too
We found that in specific cases if the connection is abruptly closed, the underlying socket is listed in a close_wait state. We continue to call the curl_multi_perform, curl_mutli_fdset etc. None of these APIs report the socket closed / connection finished. Since we have cases where the multi connection is only used once, this can pose a problem for us. I've read that if another connection was to come in, curl would see the socket as bad and attempt to close it at that time - unfortunately, this does not work for us. I found that in specific situations, if SSL_write returns 0, curl did not recognize the socket as closed (or errored out) and did not report it to the application. I believe we need to change the code slightly, to check if ssl_write returns 0. If so, treat it as an error - the same as a negative return code. For OpenSSL - the ssl_write documentation is here: http://www.openssl.org/docs/ssl/SSL_write.html
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