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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
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