New subject: Fwd: Re: connect error 0 running on ARM platform

13 Jan 2014


      ...
Message: 3
Date: Fri, 10 Jan 2014 15:27:10 +0100
From: Michal Trojnara Michal.Trojnara@mirt.net
To: stunnel-users@stunnel.org
Subject: Re: [stunnel-users] connect error 0 running on ARM platform
Message-ID: 52D0033E.1060109@mirt.net
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
On 01/09/2014 06:02 PM, FX35 wrote:
...
Running stunnel 4.56 or 5.00 on an ARM platform (ARM926EJ) with Linux
2.6.36.4, I encounter the following error : the call to connect()
return -1, but errno is set to 0 !
If stunnel is configured to use fork mode instead of pthread mode,
the problem disapear.
So it seems there is a problem, cross-compiling the program, with
errno or __errno_location() in the program generated with pthread.
I add the definition of _REENTRANT, without success ...
(See $H1 at http://pauillac.inria.fr/~xleroy/linuxthreads/faq.html)
Is somebody meet the same error ?
The errno definition in the Android framework (as an example of
Linux/ARM platform) is:
 /* internal function returning the address of the thread-specific
 errno */
 extern volatile int*   __errno(void);

 /* a macro expanding to the errno l-value */
 #define  errno   (*__errno())


It seems okay.
How do you reproduce this problem?  What are the stunnel debug logs when
it happens?
Mike
Hello Mike,
It seems that the errno variable is not correcly set/updated in C 
library, using pthread mode.
Sample:
errno = -1;
    ret = connect(...);
    if( ret == -1 )
    {
       printf("errno=%d\n",errno);
    }
will displays value -1 for errno, not EINPROGRESS or EWOULDBLOCK !
errno is not updated ...
So errno doen't reflect the real value.
Map file of stunnel programm shows _errno_localion(), as you wrote.
Perhaps is there a bug in uClib ?
Here is the result of ldd command:
# ldd stunnel
         libssl.so.1.0.0 => /usr/lib/libssl.so.1.0.0 (0x400f3000)
         libcrypto.so.1.0.0 => /usr/lib/libcrypto.so.1.0.0 (0x4013d000)
         libz.so.1 => /usr/lib/libz.so.1 (0x4027c000)
         libdl.so.0 => /lib/libdl.so.0 (0x4029b000)
         libutil.so.0 => /lib/libutil.so.0 (0x4009e000)
         libpthread.so.0 => /lib/libpthread.so.0 (0x400a7000)
         libc.so.0 => /lib/libc.so.0 (0x402a6000)
         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x400c6000)
         ld-uClibc.so.0 => /lib/ld-uClibc.so.0 (0x4008f000)
Thanks for help.
Regards,
FWX.