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//=======================================================================

//

//      main.cxx

//

//      Default main() function

//

//========================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

// -------------------------------------------                              

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under    

// the terms of the GNU General Public License as published by the Free     

// Software Foundation; either version 2 or (at your option) any later      

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//

// eCos is distributed in the hope that it will be useful, but WITHOUT      

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or    

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    

// for more details.                                                        

//

// You should have received a copy of the GNU General Public License        

// along with eCos; if not, write to the Free Software Foundation, Inc.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            

//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

// and link it with other works to produce a work based on this file,       

// this file does not by itself cause the resulting work to be covered by   

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// must still be made available in accordance with section (3) of the GNU   

// General Public License v2.                                               

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// This exception does not invalidate any other reasons why a work based    

// on this file might be covered by the GNU General Public License.         

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// ####ECOSGPLCOPYRIGHTEND####                                              

//========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     jlarmour

// Contributors:  

// Date:          2000-04-30

// Purpose:       Provide a default empty main() function

// Description:   This file provides a default empty main() function so

//                that things don't fall apart if the user starts the

//                ISO C environment (the default setting) but doesn't

//                provide their own main(). This is taken advantage of

//                in some tests (for example)

// Usage:         Obviously simply override main() in your own program to

//                prevent the use of the one below

//

//####DESCRIPTIONEND####

//

//========================================================================

// CONFIGURATION

#include <pkgconf/system.h>        // for CYGPKG_KERNEL

// INCLUDES

#include <cyg/infra/cyg_type.h>    // Common type definitions and support

#include <cyg/infra/cyg_trac.h>    // Common tracing support

#include <cyg/infra/cyg_ass.h>     // Common assertion support

#ifdef CYGPKG_KERNEL

# include <pkgconf/kernel.h>       // kernel configuration

# include <cyg/kernel/thread.hxx>  // For thread suspend

# include <cyg/kernel/thread.inl>

#endif

// FUNCTION PROTOTYPES

// We provide a weakly named main to allow this to link if the user

// doesn't provide their own main. This isn't strictly good behaviour,

// but if the user wants good performance then of _course_ they should

// play with the config options and this won't be called. Or it might

// be "giving them enough rope" etc. :-)

externC int

main( int argc, char *argv[] ) __attribute__((weak));

externC void

cyg_user_start(void);

// FUNCTIONS

externC int

main( int argc, char *argv[] )

{

    CYG_REPORT_FUNCNAMETYPE("main", "returning %d" );

    // try to be helpful by diagnosing malformed arguments

    CYG_PRECONDITION( argv != NULL, "argv is NULL!" );

    CYG_PRECONDITION( argv[argc] == NULL, "argv[argc] isn't NULL!" );

    CYG_REPORT_FUNCARG2("argc=%d, argv[0]=%s", argc,

                        (CYG_ADDRWORD)((argv[0]==NULL) ? "NULL" : argv[0]) );

    CYG_TRACE0( true, "This is the system-supplied default main()" );

    // If the kernel isn't present then cyg_libc_invoke_main() will have assumed

    // main() is present and will call it. But if we're here, then

    // evidently the user didn't supply one - which can't be right. So we

    // assume that they have useful code to run in cyg_user_start() instead.

    // Its better than just exiting

#ifndef CYGPKG_KERNEL

    cyg_user_start();

#else

    // Otherwise we suspend ourselves. This prevents problems caused by

    // running atexit() handlers.

    Cyg_Thread::self()->suspend();

#endif

    CYG_REPORT_RETVAL(0);

    return 0; // some CPUs have 0 hard-wired - faster than a reg

} // main()

// EOF main.cxx