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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 74dbf4c3f2e1
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1 //===========================================================================
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2 //
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3 // errno.cxx
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4 //
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5 // ISO C and POSIX error code
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6 //
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7 //===========================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //===========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jlarmour
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44 // Contributors: jlarmour
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45 // Date: 2000-04-14
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46 // Purpose: Provide the errno variable
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47 // Description: This file either provides the errno variable directly,
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48 // or if thread-safe, using a kernel per-thread data
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49 // access function
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50 // Usage:
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51 //
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52 //####DESCRIPTIONEND####
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53 //
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54 //===========================================================================
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55
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56 // CONFIGURATION
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57
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58 #include <pkgconf/system.h>
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59 #include <pkgconf/error.h> // Configuration header
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60
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61 #ifdef CYGPKG_ERROR_ERRNO
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62
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63 // INCLUDES
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64
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65 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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66 #include <cyg/infra/cyg_trac.h> // Common tracing functions
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67 #include <cyg/error/errno.h> // Header for this file
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68
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69 #ifdef CYGSEM_ERROR_PER_THREAD_ERRNO
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70 # include <pkgconf/kernel.h> // kernel configuration
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71 # include <cyg/kernel/thread.hxx> // per-thread data
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72 # include <cyg/kernel/thread.inl> // per-thread data
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73 # include <cyg/kernel/mutex.hxx> // mutexes
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74 #endif
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75
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76 // GLOBAL VARIABLES
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77
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78 #ifndef CYGSEM_ERROR_PER_THREAD_ERRNO
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79
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80 // errno is initialised to 0 at program startup - ANSI 7.1.4
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81 Cyg_ErrNo errno = 0;
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82
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83 #else // ifndef CYGSEM_ERROR_PER_THREAD_ERRNO
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84
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85 # if defined(CYGDBG_USE_TRACING) && defined(CYGNUM_ERROR_ERRNO_TRACE_LEVEL)
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86 static int errno_trace = CYGNUM_ERROR_ERRNO_TRACE_LEVEL;
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87 # define TL1 (0 < errno_trace)
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88 # else
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89 # define TL1 (0)
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90 # endif
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91
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92 // FUNCTIONS
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93
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94 Cyg_ErrNo *
115
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95 cyg_error_get_errno_p( void )
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96 {
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97 Cyg_ErrNo *errno_p;
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98
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99 CYG_REPORT_FUNCNAMETYPE( "cyg_error_get_errno_p", "&errno is %d");
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100
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101 // set up the thread data, allocating if necessary (even though the
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102 // user _shouldn't_ read errno before its set, we can't stop them - and
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103 // ANSI prescribes it has a sensible value (0) before its set too anyway.
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104
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105 Cyg_Thread *self = Cyg_Thread::self();
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106
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107 errno_p = (Cyg_ErrNo *)self->get_data_ptr(CYGNUM_KERNEL_THREADS_DATA_ERRNO);
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108
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109 CYG_TRACE1( TL1, "errno is %d", *errno_p );
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110
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111 CYG_REPORT_RETVAL( errno_p );
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112
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113 // return the internal data's errno
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114 return errno_p;
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115 } // cyg_error_get_errno_p()
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116
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117 #endif // ifdef CYGSEM_ERROR_PER_THREAD_ERRNO
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118
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119 #endif // ifdef CYGPKG_ERROR_ERRNO
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120
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121 // EOF errno.cxx