[ECOS] sdtin/stdout/stderr redirection

[Philippe Vandermersch]

Jifl,

You are right. It is opened in full buffering mode. A call to 
setvbuf(stdout, NULL, _IOLBF, BUFSIZ) works
Thanks.

Another question:
Why the open mode #define like O_CREAT, O_RD_ONLY..... are not the same 
definition than in Linux
Same question for the st_mode in struct stat  (VxWorks and Linux has the 
same definition)
It would make my life easier.....

I notice that eCos manage the binary mode for fopen but somehow it is 
lost along the road when calling open (which triggers my filesystem 
rpcfs_open routine)
Is there any intention to define O_BINARY

Phil.

Jonathan Larmour wrote:

> Philippe Vandermersch wrote:
>
>> Jifl.
>>
>> I liked your proposal because I do not have to deal with C++ but :
>>
>> 1)
>> fclose( stdout ) failed :
>> ASSERT FAIL: <4>dlmalloc.cxx[765]do_check_chunk() (cyg_uint8 *)p >= 
>> arenabase
>> ASSERT FAIL: <4>dlmalloc.cxx [ 765] do_check_chunk() (cyg_uint8 *)p 
>> >= arenabase
>> TRACE: <4>sched.cxx [ 705] disinherit_priority() }}RETURNING UNSET!
>> TRACE: <4>mutex.cxx [ 447] unlock()
>
>
> Bugger, I forgot about that. fclose() is trying to free stdin, but 
> stdin was not allocated off the heap.
>
>> 2)
>> If I do not close it and do simply : stdout = fdopen(fd_out , "w" ) 
>> seems to succeed but printf does print anything
>
>
> Ah... my guess is that the default buffering mode is full buffering, 
> not line buffering, so you would have to set the buffering mode to 
> _IOLBF with setvbuf().
>
> If it's not that I'm afraid I don't know off-hand what it could be. 
> fdopen() calles fopen_inner() in fopen.cxx, which calls a constructor 
> just like you do below.

>
>> 3)
>> To make it work, I had to do this in C++:
>>
>> Cyg_StdioStream *StdoutStream = new Cyg_StdioStream( fd_out, 
>> Cyg_StdioStream::CYG_STREAM_WRITE, false, false, _IOLBF );
>> if(StdoutStream == NULL) return( ENOMEM );
>> stdout = (FILE *)StdoutStream;
>>
>> It also works for stdin,stderr.
>
>
> That's good. Although if you had a moment, it would be nice if you 
> could have a quick poke around to see why 2) didn't work, and in 
> particular if using setvbuf(stdout, NULL, _IOLBF, BUFSIZ); is all it 
> takes.
>
> Jifl





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