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

//

//      errno.cxx

//

//      ISO C and POSIX error code

//

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

// ####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:  jlarmour

// Date:          2000-04-14

// Purpose:       Provide the errno variable

// Description:   This file either provides the errno variable directly,

//                or if thread-safe, using a kernel per-thread data

//                access function

// Usage:       

//

//####DESCRIPTIONEND####

//

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

// CONFIGURATION

#include <pkgconf/system.h>

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

#ifdef CYGPKG_ERROR_ERRNO

// INCLUDES

#include <cyg/infra/cyg_type.h>   // Common project-wide type definitions

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

#include <cyg/error/errno.h>      // Header for this file

#ifdef CYGSEM_ERROR_PER_THREAD_ERRNO

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

# include <cyg/kernel/thread.hxx>  // per-thread data

# include <cyg/kernel/thread.inl>  // per-thread data

# include <cyg/kernel/mutex.hxx>   // mutexes

#endif

// GLOBAL VARIABLES

#ifndef CYGSEM_ERROR_PER_THREAD_ERRNO

// errno is initialised to 0 at program startup - ANSI 7.1.4

Cyg_ErrNo errno = 0;

#else // ifndef CYGSEM_ERROR_PER_THREAD_ERRNO

# if defined(CYGDBG_USE_TRACING) && defined(CYGNUM_ERROR_ERRNO_TRACE_LEVEL)

static int errno_trace = CYGNUM_ERROR_ERRNO_TRACE_LEVEL;

#  define TL1 (0 < errno_trace)

# else

#  define TL1 (0)

# endif

// FUNCTIONS

Cyg_ErrNo *

cyg_error_get_errno_p( void )

{

    Cyg_ErrNo *errno_p;

    CYG_REPORT_FUNCNAMETYPE( "cyg_error_get_errno_p", "&errno is %d");

    // set up the thread data, allocating if necessary (even though the

    // user _shouldn't_ read errno before its set, we can't stop them - and

    // ANSI prescribes it has a sensible value (0) before its set too anyway.

    Cyg_Thread *self = Cyg_Thread::self();

    errno_p = (Cyg_ErrNo *)self->get_data_ptr(CYGNUM_KERNEL_THREADS_DATA_ERRNO);

    CYG_TRACE1( TL1, "errno is %d", *errno_p );

    CYG_REPORT_RETVAL( errno_p );

    // return the internal data's errno

    return errno_p;

} // cyg_error_get_errno_p()

#endif // ifdef CYGSEM_ERROR_PER_THREAD_ERRNO

#endif // ifdef CYGPKG_ERROR_ERRNO

// EOF errno.cxx