Merge pull request #172 from edzius/master

Handle SSL_send SYSCALL error without errno
https://www.openssl.org/docs/man1.1.1/man3/SSL_get_error.html

src/ssl.c

@@ -182,6 +182,10 @@ static int ssl_send(void *ctx, const char *data, size_t count, size_t *sent,
         ssl->error = SSL_ERROR_SSL;
         return LSEC_IO_SSL;
       }
+      /* Return failure when SSL reports syscall error
+       * but errno is not set to break send operation. */
+      if (errno == 0)
+        return LSEC_IO_SSL;
       if (err == 0)
         return IO_CLOSED;
       return lsec_socket_error();