AW: [ECOS] probably simple problem: ASSERT in Cyg_StdIostream

AW: [ECOS] probably simple problem: ASSERT in Cyg_StdIostream

[Neundorf, Alexander]

Hi,

> Hi,
> 
> probably a simple question, but I already searched on the web 
> for an answer but wasn't successful.
> So, I added to my working firmware the File IO package, and 
> didn't change anything in the code. Otherwise I don't use the 
> POSIX compat. (i.e. no pthreads, no main()).
> Now, when my program starts I get an assert:
> 
> ASSERT FAIL: <8>stream.inl[109]cyg_bool 
> Cyg_StdioStream::trylock_me() Stream
> object is not a valid stream!

It seems to be the same problem as mentioned here, but there was no reply:
http://sources.redhat.com/ml/ecos-discuss/2003-05/msg00447.html

Here's the code which causes the assert:

void cyg_user_start() {
   unsigned int day;
   sscanf("1", "%d", &day);
...

and this one doesn't crash:

void cyg_user_start() {
   unsigned int day;
   sscanf("1 ", "%d", &day); //note the one whitespace after the "1"

It works without problems without the file io package. I have no filesystems mounted. It's ecos cvs from approx. one year ago. The posix compat package isn't included in my ecos configuration, so my application starts from cyg_user_start() as you can see and not from main(). I suspect that there are some missing initialisations in this case somewhere.

Any ideas ?

Bye
Alex

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AW: [ECOS] probably simple problem: ASSERT in Cyg_StdIostream

[Neundorf, Alexander]

Hi, 

...
> > ASSERT FAIL: <8>stream.inl[109]cyg_bool 
> > Cyg_StdioStream::trylock_me() Stream
> > object is not a valid stream!
> 
> It seems to be the same problem as mentioned here, but there 
> was no reply:
> http://sources.redhat.com/ml/ecos-discuss/2003-05/msg00447.html
> 
> Here's the code which causes the assert:
> 
> void cyg_user_start() {
>    unsigned int day;
>    sscanf("1", "%d", &day);

I got some more information: the assert hits because neither the magic_code of stdin nor of stdout are set correctly. They aren't set because for both buffer_size==-1 and WANT_BUFFERED_IO is true in Cyg_StdioStream::initialize(). CYG_LIBC_STDIO_BUFSIZE has the default value of 256. 


Alex

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