Re: [ECOS] Newbie-Q: Clean exits from tests and examples

[Sergei Gavrikov <w3sg@SoftHome.net>]

On Wed, May 16, 2007 at 09:58:53AM -0500, John Mills wrote:
> Hello -
> 
> I'm getting started with the eCos-2.0 'synthetic' target and have a couple 
> of beginner's questions.
> 
> I used the command line setup:
> 
> $ ecosconfig new linux default
> 
> [edited 'ecos.ecc' tools prefix to match my installation]
> 
> $ ecosconfig tree
> $ make
> $ make tests
> 
> All this went fine.
> 
> I copied the 'ecos-2.0/examples' directory into my scratch directory 
> and can built the executables, which also went fine:
> 
> $ cd examples
> $ make INSTALL_DIR=<my_install>
> 
> The 'install/.../tests' like 'wallclock' run and exit fine. The 'examples' 
> run fine,
> but don't exit (i.e., 'hello' prints its output then sits until I kill it
> with '^C').
> 
> $ ~/sandbox/ecos/examples> ./hello
> Hello, eCos world!
> [and here we stay until I issue a '^C']
> 
> Question: How should 'examples/hello.c' be structured to run and exit, 
> returning cleanly to the parent Linux shell, or how should I invoke it?
> 

Answer: main(){printf("hello, world!\n");cyg_hal_sys_exit(0);}

That's normal. The _tests_ for the synthetic target usually is finished
by the CYGHWR_TEST_PROGRAM_EXIT (include/cyg/hal/hal_intr.h). So, there
is the cyg_hal_sys_exit(0) in those wallclock* tests.

And you can see that examples/hello.c exits from main with return 0.
That's UNIX way. But eCos != UNIX. Where has to return the application?
You can easy see the difference using GDB, set a breakpoint either to
the 'cyg_test_exit' call (for the tests) or to the 'exit' call (for the
POSIX sources). And more, try to run the synthetic executables from
shell as 'appname --io'.

  Sergei

> Thanks.
> 
>  - John Mills
>    john.m.mills@alum.mit.edu
> 
> 
> 
> -- 
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> and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss

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