Bodo Moeller via RT wrote:
>Ralph via RT <[EMAIL PROTECTED]>:
>
>
>
>>But so far, I can tell you that when SSL_get_error() returns
>>SSL_ERROR_SYSCALL and you inspect errno, it tells EWOULDBLOCK or EAGAIN.
>>By repeating the SSL_* call as long as this condition occurs, I can
>>overcome the problem and the SSL handshake and communication works
>>perfectly. Oh...it's in a multi-threaded application, too! Maybe this
>>helps (OpenSSL compiled with the correct switch for MT - I hope)
>>
>>
>
>If OpenSSL is *not* compiler with correct switches for multithreading,
>that would explain -- in that case, SSL_get_error() could be reading
>the wrong copy of errno and thus not find the EWOULDBLOCK/EAGAIN code.
>
>Here's something to try: find the 'errno' definition for multi-threading
>in the system header files, which should involve some function call;
>then use 'nm' to see if that function is mentioned in the OpenSSL
>object files that you are linking with. (bss_sock.o is the object
>file to look at.)
>
Hi Bodo,
sorry that it took so long, but I had too much work ;-)
However, I tracked the problem down. You were right in saying that
OpenSSL libraries were not compiled and linked correctly to the threads
libraries of AIX. But with the out-of-the box configuration tool
(configure) it is nearly impossible to do that on AIX systems. The
correct compiler to be used is xlc_r which ist the only by IBM supported
AIX compiler . I just changed the Makefile definition after configuring:
CC=/usr/vac/bin/xlc_r
(this is the standard location of the compiler) and the libraries had
the correct functions for errno linked (checked it against the
application and the SSL_ERROR_SYSCALL vanished).
So my question would be as followed: In configure script,
- either check for "threads" option and existence of xlc_r and use it. Or,
- (this is my favourite and been used by Apache configure scripts)
evaluate an environment variable named CC and use this as the compiler
to use, regardless what the configure script would evaluate
As I told you, this is an AIX specific problem with threading but may
occur on other systems as well. So applying the CC variable option is
the best approach to deal with it (in my opinion).
Thanx anyway for your help,
Ralph
P.S.: If you need evaluations on AIX, feel free to contact me as I got
access to them.
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