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

//

//      atexit.cxx

//

//      Implementation of the atexit() function

//

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

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//

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//

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

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

//

// Author(s):    jlarmour

// Contributors: 

// Date:         2000-04-30

// Purpose:     

// Description: 

// Usage:       

//

//####DESCRIPTIONEND####

//

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

// CONFIGURATION

#include <pkgconf/libc_startup.h>   // Configuration header

// Include atexit() ?

#ifdef CYGFUN_LIBC_ATEXIT

// 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

#include <stdlib.h>                // Header for all stdlib functions

                                   // (like this one)

// STATICS

// cyg_libc_atexit_handlers contains the functions to call.

// cyg_libc_atexit_handlers_count contains the number of valid handlers

// or you can consider the next free handler slot in

// cyg_libc_atexit_handlers.

static __atexit_fn_t

cyg_libc_atexit_handlers[ CYGNUM_LIBC_ATEXIT_HANDLERS ];

static cyg_ucount32 cyg_libc_atexit_handlers_count;

// FUNCTIONS

externC void

cyg_libc_invoke_atexit_handlers( void )

{

    CYG_REPORT_FUNCNAME( "cyg_libc_invoke_atexit_handlers");

    CYG_REPORT_FUNCARGVOID();

    cyg_ucount32 i;

    for (i=cyg_libc_atexit_handlers_count; i>0; --i) {

        CYG_TRACE1( true,

                    "Calling function registered with atexit at addr %08x",

                    cyg_libc_atexit_handlers[i-1] );

        CYG_CHECK_FUNC_PTR( cyg_libc_atexit_handlers[i-1],

                            "Function to call in atexit handler list "

                            "isn't valid! Even though it was when "

                            "entered!" );

        (*cyg_libc_atexit_handlers[i-1])();

    } // for

    CYG_REPORT_RETURN();

} // cyg_libc_invoke_atexit_handlers()

externC int

atexit( __atexit_fn_t func_to_register )

{

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

    CYG_REPORT_FUNCARG1XV( func_to_register );

    CYG_CHECK_FUNC_PTR( func_to_register,

                       "atexit() not passed a valid function argument!" );

    // have we any slots left?

    if (cyg_libc_atexit_handlers_count >=

        sizeof(cyg_libc_atexit_handlers)/sizeof(__atexit_fn_t) ) {

        CYG_REPORT_RETVAL( 1 );

        return 1; // failure

    } // if

    cyg_libc_atexit_handlers[cyg_libc_atexit_handlers_count++] =

        func_to_register;

    CYG_REPORT_RETVAL(0);

    return 0;

} // atexit()

#endif // ifdef CYGFUN_LIBC_ATEXIT

// EOF atexit.cxx