Re: [stunnel-users] connect error 0 running on ARM platform

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.