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 | * $Id$ |
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9 | */ |
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10 | /** |
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11 | * @file |
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12 | * |
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13 | * @ingroup rtems-rfs |
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14 | * |
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15 | * RTEMS RFS Device Interface. |
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16 | * |
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17 | * This file contains the set of handlers used to map operations on RFS device |
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18 | * nodes onto calls to the RTEMS Classic API IO Manager. |
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19 | * |
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20 | */ |
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21 | |
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22 | #if HAVE_CONFIG_H |
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23 | #include "config.h" |
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24 | #endif |
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25 | |
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26 | #include "rtems-rfs-rtems.h" |
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27 | |
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28 | /* |
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29 | * Convert RTEMS status to a UNIX errno |
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30 | */ |
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31 | extern int rtems_deviceio_errno (rtems_status_code code); |
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32 | |
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33 | /** |
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34 | * This handler maps an open() operation onto rtems_io_open(). |
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35 | * |
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36 | * @param iop |
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37 | * @param pathname |
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38 | * @param flag |
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39 | * @param mode |
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40 | * @return int |
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41 | */ |
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42 | static int |
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43 | rtems_rfs_rtems_device_open ( rtems_libio_t *iop, |
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44 | const char *pathname, |
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45 | uint32_t flag, |
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46 | uint32_t mode) |
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47 | { |
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48 | rtems_libio_open_close_args_t args; |
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49 | rtems_rfs_file_system* fs = rtems_rfs_rtems_pathloc_dev (&iop->pathinfo); |
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50 | rtems_rfs_ino ino = rtems_rfs_rtems_get_iop_ino (iop); |
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51 | rtems_rfs_inode_handle inode; |
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52 | int major; |
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53 | int minor; |
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54 | rtems_status_code status; |
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55 | int rc; |
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56 | |
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57 | rtems_rfs_rtems_lock (fs); |
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58 | |
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59 | rc = rtems_rfs_inode_open (fs, ino, &inode, true); |
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60 | if (rc > 0) |
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61 | { |
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62 | rtems_rfs_rtems_unlock (fs); |
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63 | return rtems_rfs_rtems_error ("device_open: opening inode", rc); |
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64 | } |
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65 | |
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66 | major = rtems_rfs_inode_get_block (&inode, 0); |
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67 | minor = rtems_rfs_inode_get_block (&inode, 1); |
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68 | |
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69 | rc = rtems_rfs_inode_close (fs, &inode); |
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70 | if (rc > 0) |
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71 | { |
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72 | rtems_rfs_rtems_unlock (fs); |
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73 | return rtems_rfs_rtems_error ("device_open: closing inode", rc); |
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74 | } |
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75 | |
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76 | rtems_rfs_rtems_unlock (fs); |
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77 | |
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78 | iop->data0 = major; |
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79 | iop->data1 = (void*)((intptr_t) minor); |
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80 | |
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81 | args.iop = iop; |
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82 | args.flags = iop->flags; |
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83 | args.mode = mode; |
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84 | |
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85 | status = rtems_io_open (major, minor, (void *) &args); |
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86 | |
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87 | return rtems_deviceio_errno (status); |
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88 | } |
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89 | |
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90 | /** |
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91 | * This handler maps a close() operation onto rtems_io_close(). |
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92 | * |
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93 | * @param iop |
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94 | * @return int |
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95 | */ |
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96 | |
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97 | static int |
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98 | rtems_rfs_rtems_device_close (rtems_libio_t* iop) |
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99 | { |
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100 | rtems_libio_open_close_args_t args; |
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101 | rtems_status_code status; |
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102 | int major; |
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103 | int minor; |
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104 | |
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105 | major = (int) iop->data0; |
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106 | minor = (intptr_t) iop->data1; |
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107 | |
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108 | args.iop = iop; |
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109 | args.flags = 0; |
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110 | args.mode = 0; |
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111 | |
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112 | status = rtems_io_close (major, minor, (void *) &args); |
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113 | |
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114 | return rtems_deviceio_errno (status); |
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115 | } |
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116 | |
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117 | /** |
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118 | * This handler maps a read() operation onto rtems_io_read(). |
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119 | * |
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120 | * @param iop |
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121 | * @param buffer |
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122 | * @param count |
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123 | * @return ssize_t |
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124 | */ |
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125 | |
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126 | static ssize_t |
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127 | rtems_rfs_rtems_device_read (rtems_libio_t* iop, void* buffer, size_t count) |
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128 | { |
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129 | rtems_libio_rw_args_t args; |
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130 | rtems_status_code status; |
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131 | int major; |
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132 | int minor; |
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133 | |
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134 | major = (int) iop->data0; |
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135 | minor = (intptr_t) iop->data1; |
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136 | |
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137 | args.iop = iop; |
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138 | args.offset = iop->offset; |
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139 | args.buffer = buffer; |
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140 | args.count = count; |
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141 | args.flags = iop->flags; |
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142 | args.bytes_moved = 0; |
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143 | |
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144 | status = rtems_io_read (major, minor, (void *) &args); |
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145 | if (status) |
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146 | return rtems_deviceio_errno (status); |
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147 | |
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148 | return (ssize_t) args.bytes_moved; |
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149 | } |
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150 | |
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151 | /* |
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152 | * This handler maps a write() operation onto rtems_io_write(). |
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153 | * |
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154 | * @param iop |
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155 | * @param buffer |
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156 | * @param count |
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157 | * @return ssize_t |
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158 | */ |
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159 | |
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160 | static ssize_t |
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161 | rtems_rfs_rtems_device_write (rtems_libio_t* iop, |
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162 | const void* buffer, |
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163 | size_t count) |
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164 | { |
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165 | rtems_libio_rw_args_t args; |
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166 | rtems_status_code status; |
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167 | int major; |
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168 | int minor; |
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169 | |
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170 | major = (int) iop->data0; |
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171 | minor = (intptr_t) iop->data1; |
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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 | uint32_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 | int major; |
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204 | int minor; |
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205 | |
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206 | major = (int) iop->data0; |
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207 | minor = (intptr_t) iop->data1; |
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208 | |
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209 | args.iop = iop; |
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210 | args.command = command; |
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211 | args.buffer = buffer; |
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212 | |
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213 | status = rtems_io_control (major, minor, (void *) &args); |
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214 | if (status) |
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215 | return rtems_deviceio_errno (status); |
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216 | |
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217 | return args.ioctl_return; |
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218 | } |
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219 | |
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220 | /** |
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221 | * This handler eats all lseek() operations and does not create an error. It |
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222 | * assumes all devices can handle the seek. The writes fail. |
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223 | * |
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224 | * @param iop |
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225 | * @param offset |
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226 | * @param whence |
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227 | * @return rtems_off64_t |
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228 | */ |
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229 | |
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230 | static rtems_off64_t |
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231 | rtems_rfs_rtems_device_lseek (rtems_libio_t* iop, |
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232 | rtems_off64_t offset, |
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233 | int whence) |
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234 | { |
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235 | return offset; |
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236 | } |
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237 | |
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238 | /** |
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239 | * The consumes the truncate call. You cannot truncate device files. |
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240 | * |
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241 | * @param iop |
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242 | * @param length |
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243 | * @return int |
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244 | */ |
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245 | |
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246 | static int |
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247 | rtems_rfs_rtems_device_ftruncate (rtems_libio_t* iop, rtems_off64_t length) |
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248 | { |
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249 | return 0; |
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250 | } |
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251 | |
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252 | /* |
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253 | * Handler table for RFS device nodes |
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254 | */ |
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255 | |
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256 | const rtems_filesystem_file_handlers_r rtems_rfs_rtems_device_handlers = { |
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257 | .open_h = rtems_rfs_rtems_device_open, |
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258 | .close_h = rtems_rfs_rtems_device_close, |
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259 | .read_h = rtems_rfs_rtems_device_read, |
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260 | .write_h = rtems_rfs_rtems_device_write, |
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261 | .ioctl_h = rtems_rfs_rtems_device_ioctl, |
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262 | .lseek_h = rtems_rfs_rtems_device_lseek, |
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263 | .fstat_h = rtems_rfs_rtems_stat, |
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264 | .fchmod_h = rtems_rfs_rtems_fchmod, |
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265 | .ftruncate_h = rtems_rfs_rtems_device_ftruncate, |
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266 | .fpathconf_h = NULL, |
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267 | .fsync_h = NULL, |
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268 | .fdatasync_h = NULL, |
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269 | .fcntl_h = NULL, |
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270 | .rmnod_h = rtems_rfs_rtems_rmnod |
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271 | }; |
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