1 | /* |
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2 | * COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org> |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution or at |
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6 | * http://www.rtems.com/license/LICENSE. |
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7 | */ |
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8 | /** |
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9 | * @file |
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10 | * |
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11 | * @ingroup rtems-rfs |
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12 | * |
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13 | * RTEMS RFS Device Interface. |
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14 | * |
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15 | * This file contains the set of handlers used to map operations on RFS device |
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16 | * nodes onto calls to the RTEMS Classic API IO Manager. |
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17 | * |
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18 | */ |
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19 | |
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20 | #if HAVE_CONFIG_H |
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21 | #include "config.h" |
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22 | #endif |
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23 | |
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24 | #include <rtems/devfs.h> |
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25 | #include "rtems-rfs-rtems.h" |
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26 | |
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27 | static void |
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28 | rtems_rfs_rtems_device_get_major_and_minor ( const rtems_libio_t *iop, |
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29 | rtems_device_major_number *major, |
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30 | rtems_device_minor_number *minor) |
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31 | { |
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32 | *major = iop->data0; |
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33 | *minor = (rtems_device_minor_number) iop->data1; |
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34 | } |
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35 | |
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36 | /** |
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37 | * This handler maps an open() operation onto rtems_io_open(). |
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38 | * |
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39 | * @param iop |
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40 | * @param pathname |
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41 | * @param flag |
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42 | * @param mode |
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43 | * @return int |
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44 | */ |
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45 | static int |
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46 | rtems_rfs_rtems_device_open ( rtems_libio_t *iop, |
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47 | const char *pathname, |
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48 | int oflag, |
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49 | mode_t mode) |
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50 | { |
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51 | rtems_libio_open_close_args_t args; |
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52 | rtems_rfs_file_system* fs = rtems_rfs_rtems_pathloc_dev (&iop->pathinfo); |
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53 | rtems_rfs_ino ino = rtems_rfs_rtems_get_iop_ino (iop); |
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54 | rtems_rfs_inode_handle inode; |
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55 | rtems_device_major_number major; |
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56 | rtems_device_minor_number minor; |
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57 | rtems_status_code status; |
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58 | int rc; |
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59 | |
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60 | rtems_rfs_rtems_lock (fs); |
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61 | |
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62 | rc = rtems_rfs_inode_open (fs, ino, &inode, true); |
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63 | if (rc > 0) |
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64 | { |
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65 | rtems_rfs_rtems_unlock (fs); |
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66 | return rtems_rfs_rtems_error ("device_open: opening inode", rc); |
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67 | } |
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68 | |
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69 | major = rtems_rfs_inode_get_block (&inode, 0); |
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70 | minor = rtems_rfs_inode_get_block (&inode, 1); |
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71 | |
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72 | rc = rtems_rfs_inode_close (fs, &inode); |
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73 | if (rc > 0) |
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74 | { |
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75 | rtems_rfs_rtems_unlock (fs); |
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76 | return rtems_rfs_rtems_error ("device_open: closing inode", rc); |
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77 | } |
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78 | |
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79 | rtems_rfs_rtems_unlock (fs); |
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80 | |
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81 | iop->data0 = major; |
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82 | iop->data1 = (void *) minor; |
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83 | |
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84 | args.iop = iop; |
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85 | args.flags = iop->flags; |
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86 | args.mode = mode; |
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87 | |
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88 | status = rtems_io_open (major, minor, (void *) &args); |
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89 | |
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90 | return rtems_deviceio_errno (status); |
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91 | } |
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92 | |
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93 | /** |
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94 | * This handler maps a close() operation onto rtems_io_close(). |
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95 | * |
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96 | * @param iop |
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97 | * @return int |
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98 | */ |
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99 | |
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100 | static int |
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101 | rtems_rfs_rtems_device_close (rtems_libio_t* iop) |
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102 | { |
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103 | rtems_libio_open_close_args_t args; |
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104 | rtems_status_code status; |
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105 | rtems_device_major_number major; |
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106 | rtems_device_minor_number minor; |
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107 | |
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108 | rtems_rfs_rtems_device_get_major_and_minor (iop, &major, &minor); |
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109 | |
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110 | args.iop = iop; |
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111 | args.flags = 0; |
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112 | args.mode = 0; |
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113 | |
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114 | status = rtems_io_close (major, minor, (void *) &args); |
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115 | |
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116 | return rtems_deviceio_errno (status); |
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117 | } |
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118 | |
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119 | /** |
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120 | * This handler maps a read() operation onto rtems_io_read(). |
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121 | * |
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122 | * @param iop |
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123 | * @param buffer |
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124 | * @param count |
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125 | * @return ssize_t |
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126 | */ |
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127 | |
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128 | static ssize_t |
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129 | rtems_rfs_rtems_device_read (rtems_libio_t* iop, void* buffer, size_t count) |
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130 | { |
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131 | rtems_libio_rw_args_t args; |
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132 | rtems_status_code status; |
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133 | rtems_device_major_number major; |
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134 | rtems_device_minor_number minor; |
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135 | |
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136 | rtems_rfs_rtems_device_get_major_and_minor (iop, &major, &minor); |
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137 | |
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138 | args.iop = iop; |
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139 | args.offset = iop->offset; |
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140 | args.buffer = buffer; |
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141 | args.count = count; |
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142 | args.flags = iop->flags; |
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143 | args.bytes_moved = 0; |
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144 | |
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145 | status = rtems_io_read (major, minor, (void *) &args); |
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146 | if (status) |
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147 | return rtems_deviceio_errno (status); |
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148 | |
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149 | return (ssize_t) args.bytes_moved; |
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150 | } |
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151 | |
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152 | /* |
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153 | * This handler maps a write() operation onto rtems_io_write(). |
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154 | * |
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155 | * @param iop |
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156 | * @param buffer |
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157 | * @param count |
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158 | * @return ssize_t |
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159 | */ |
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160 | |
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161 | static ssize_t |
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162 | rtems_rfs_rtems_device_write (rtems_libio_t* iop, |
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163 | const void* buffer, |
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164 | size_t count) |
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165 | { |
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166 | rtems_libio_rw_args_t args; |
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167 | rtems_status_code status; |
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168 | rtems_device_major_number major; |
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169 | rtems_device_minor_number minor; |
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170 | |
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171 | rtems_rfs_rtems_device_get_major_and_minor (iop, &major, &minor); |
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172 | |
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173 | args.iop = iop; |
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174 | args.offset = iop->offset; |
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175 | args.buffer = (void *) buffer; |
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176 | args.count = count; |
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177 | args.flags = iop->flags; |
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178 | args.bytes_moved = 0; |
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179 | |
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180 | status = rtems_io_write (major, minor, (void *) &args); |
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181 | if (status) |
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182 | return rtems_deviceio_errno (status); |
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183 | |
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184 | return (ssize_t) args.bytes_moved; |
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185 | } |
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186 | |
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187 | /** |
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188 | * This handler maps an ioctl() operation onto rtems_io_ioctl(). |
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189 | * |
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190 | * @param iop |
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191 | * @param command |
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192 | * @param buffer |
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193 | * @return int |
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194 | */ |
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195 | |
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196 | static int |
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197 | rtems_rfs_rtems_device_ioctl (rtems_libio_t* iop, |
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198 | ioctl_command_t command, |
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199 | void* buffer) |
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200 | { |
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201 | rtems_libio_ioctl_args_t args; |
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202 | rtems_status_code status; |
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203 | rtems_device_major_number major; |
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204 | rtems_device_minor_number minor; |
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205 | |
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206 | rtems_rfs_rtems_device_get_major_and_minor (iop, &major, &minor); |
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207 | |
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208 | args.iop = iop; |
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209 | args.command = command; |
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210 | args.buffer = buffer; |
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211 | |
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212 | status = rtems_io_control (major, minor, (void *) &args); |
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213 | if (status) |
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214 | return rtems_deviceio_errno (status); |
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215 | |
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216 | return args.ioctl_return; |
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217 | } |
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218 | |
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219 | /** |
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220 | * The consumes the truncate call. You cannot truncate device files. |
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221 | * |
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222 | * @param iop |
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223 | * @param length |
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224 | * @return int |
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225 | */ |
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226 | |
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227 | static int |
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228 | rtems_rfs_rtems_device_ftruncate (rtems_libio_t* iop, off_t length) |
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229 | { |
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230 | return 0; |
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231 | } |
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232 | |
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233 | /* |
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234 | * Handler table for RFS device nodes |
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235 | */ |
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236 | |
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237 | const rtems_filesystem_file_handlers_r rtems_rfs_rtems_device_handlers = { |
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238 | .open_h = rtems_rfs_rtems_device_open, |
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239 | .close_h = rtems_rfs_rtems_device_close, |
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240 | .read_h = rtems_rfs_rtems_device_read, |
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241 | .write_h = rtems_rfs_rtems_device_write, |
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242 | .ioctl_h = rtems_rfs_rtems_device_ioctl, |
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243 | .lseek_h = rtems_filesystem_default_lseek_file, |
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244 | .fstat_h = rtems_rfs_rtems_fstat, |
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245 | .ftruncate_h = rtems_rfs_rtems_device_ftruncate, |
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246 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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247 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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248 | .fcntl_h = rtems_filesystem_default_fcntl |
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249 | }; |
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