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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
// version.
//
// 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
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####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
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