1 | /* /dev/null |
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2 | * |
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3 | * Derived from rtems' stub driver. |
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4 | * |
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5 | * Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de) |
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6 | * |
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7 | * COPYRIGHT (c) 1989-2000. |
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8 | * On-Line Applications Research Corporation (OAR). |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.OARcorp.com/rtems/license.html. |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | #ifdef HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems.h> |
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22 | #include <rtems/devnull.h> |
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23 | #include <rtems/libio.h> |
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24 | |
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25 | /* null_initialize |
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26 | * |
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27 | * This routine is the null device driver init routine. |
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28 | * |
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29 | * Input parameters: |
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30 | * major - device major number |
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31 | * minor - device minor number |
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32 | * pargp - pointer to parameter block |
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33 | * |
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34 | * Output parameters: |
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35 | * rval - NULL_SUCCESSFUL |
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36 | */ |
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37 | |
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38 | rtems_unsigned32 NULL_major; |
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39 | static char initialized; |
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40 | |
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41 | rtems_device_driver null_initialize( |
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42 | rtems_device_major_number major, |
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43 | rtems_device_minor_number minor, |
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44 | void *pargp |
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45 | ) |
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46 | { |
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47 | rtems_device_driver status; |
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48 | |
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49 | if ( !initialized ) { |
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50 | initialized = 1; |
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51 | |
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52 | status = rtems_io_register_name( |
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53 | "/dev/null", |
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54 | major, |
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55 | (rtems_device_minor_number) 0 |
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56 | ); |
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57 | |
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58 | if (status != RTEMS_SUCCESSFUL) |
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59 | rtems_fatal_error_occurred(status); |
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60 | |
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61 | NULL_major = major; |
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62 | } |
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63 | |
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64 | return RTEMS_SUCCESSFUL; |
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65 | } |
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66 | |
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67 | /* null_open |
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68 | * |
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69 | * This routine is the null device driver open routine. |
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70 | * |
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71 | * Input parameters: |
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72 | * major - device major number |
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73 | * minor - device minor number |
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74 | * pargb - pointer to open parameter block |
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75 | * |
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76 | * Output parameters: |
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77 | * rval - NULL_SUCCESSFUL |
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78 | */ |
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79 | |
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80 | rtems_device_driver null_open( |
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81 | rtems_device_major_number major, |
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82 | rtems_device_minor_number minor, |
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83 | void *pargp |
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84 | ) |
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85 | { |
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86 | return NULL_SUCCESSFUL; |
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87 | } |
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88 | |
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89 | |
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90 | /* null_close |
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91 | * |
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92 | * This routine is the null device driver close routine. |
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93 | * |
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94 | * Input parameters: |
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95 | * major - device major number |
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96 | * minor - device minor number |
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97 | * pargb - pointer to close parameter block |
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98 | * |
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99 | * Output parameters: |
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100 | * rval - NULL_SUCCESSFUL |
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101 | */ |
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102 | |
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103 | rtems_device_driver null_close( |
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104 | rtems_device_major_number major, |
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105 | rtems_device_minor_number minor, |
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106 | void *pargp |
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107 | ) |
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108 | { |
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109 | return NULL_SUCCESSFUL; |
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110 | } |
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111 | |
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112 | |
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113 | /* null_read |
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114 | * |
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115 | * This routine is the null device driver read routine. |
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116 | * |
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117 | * Input parameters: |
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118 | * major - device major number |
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119 | * minor - device minor number |
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120 | * pargp - pointer to read parameter block |
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121 | * |
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122 | * Output parameters: |
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123 | * rval - NULL_SUCCESSFUL |
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124 | */ |
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125 | |
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126 | rtems_device_driver null_read( |
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127 | rtems_device_major_number major, |
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128 | rtems_device_minor_number minor, |
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129 | void *pargp |
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130 | ) |
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131 | { |
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132 | return NULL_SUCCESSFUL; |
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133 | } |
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134 | |
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135 | |
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136 | /* null_write |
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137 | * |
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138 | * This routine is the null device driver write routine. |
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139 | * |
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140 | * Input parameters: |
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141 | * major - device major number |
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142 | * minor - device minor number |
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143 | * pargp - pointer to write parameter block |
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144 | * |
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145 | * Output parameters: |
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146 | * rval - NULL_SUCCESSFUL |
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147 | */ |
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148 | |
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149 | rtems_device_driver null_write( |
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150 | rtems_device_major_number major, |
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151 | rtems_device_minor_number minor, |
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152 | void *pargp |
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153 | ) |
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154 | { |
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155 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *) pargp; |
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156 | |
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157 | if ( rw_args ) |
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158 | rw_args->bytes_moved = rw_args->count; |
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159 | |
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160 | return NULL_SUCCESSFUL; |
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161 | } |
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162 | |
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163 | |
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164 | /* null_control |
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165 | * |
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166 | * This routine is the null device driver control routine. |
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167 | * |
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168 | * Input parameters: |
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169 | * major - device major number |
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170 | * minor - device minor number |
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171 | * pargp - pointer to cntrl parameter block |
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172 | * |
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173 | * Output parameters: |
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174 | * rval - NULL_SUCCESSFUL |
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175 | */ |
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176 | |
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177 | rtems_device_driver null_control( |
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178 | rtems_device_major_number major, |
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179 | rtems_device_minor_number minor, |
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180 | void *pargp |
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181 | ) |
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182 | { |
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183 | return NULL_SUCCESSFUL; |
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184 | } |
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