1 | /* |
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2 | * IMFS Device Node Handlers |
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3 | * |
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4 | * This file contains the set of handlers used to map operations on |
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5 | * IMFS device nodes onto calls to the RTEMS Classic API IO Manager. |
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6 | * |
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7 | * COPYRIGHT (c) 1989-2008. |
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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.rtems.com/license/LICENSE. |
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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 | #if 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 "imfs.h" |
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22 | |
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23 | #include <rtems/devfs.h> |
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24 | |
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25 | /* |
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26 | * device_open |
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27 | * |
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28 | * This handler maps an open() operation onto rtems_io_open(). |
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29 | */ |
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30 | |
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31 | int device_open( |
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32 | rtems_libio_t *iop, |
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33 | const char *pathname, |
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34 | int oflag, |
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35 | mode_t mode |
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36 | ) |
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37 | { |
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38 | rtems_libio_open_close_args_t args; |
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39 | rtems_status_code status; |
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40 | IMFS_jnode_t *the_jnode; |
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41 | |
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42 | the_jnode = iop->pathinfo.node_access; |
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43 | |
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44 | args.iop = iop; |
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45 | args.flags = iop->flags; |
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46 | args.mode = mode; |
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47 | |
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48 | status = rtems_io_open( |
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49 | the_jnode->info.device.major, |
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50 | the_jnode->info.device.minor, |
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51 | (void *) &args |
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52 | ); |
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53 | |
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54 | return rtems_deviceio_errno( status ); |
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55 | } |
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56 | |
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57 | /* |
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58 | * device_close |
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59 | * |
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60 | * This handler maps a close() operation onto rtems_io_close(). |
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61 | */ |
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62 | |
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63 | int device_close( |
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64 | rtems_libio_t *iop |
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65 | ) |
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66 | { |
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67 | rtems_libio_open_close_args_t args; |
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68 | rtems_status_code status; |
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69 | IMFS_jnode_t *the_jnode; |
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70 | |
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71 | the_jnode = iop->pathinfo.node_access; |
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72 | |
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73 | args.iop = iop; |
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74 | args.flags = 0; |
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75 | args.mode = 0; |
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76 | |
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77 | status = rtems_io_close( |
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78 | the_jnode->info.device.major, |
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79 | the_jnode->info.device.minor, |
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80 | (void *) &args |
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81 | ); |
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82 | |
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83 | return rtems_deviceio_errno( status ); |
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84 | } |
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85 | |
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86 | /* |
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87 | * device_read |
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88 | * |
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89 | * This handler maps a read() operation onto rtems_io_read(). |
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90 | */ |
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91 | |
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92 | ssize_t device_read( |
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93 | rtems_libio_t *iop, |
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94 | void *buffer, |
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95 | size_t count |
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96 | ) |
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97 | { |
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98 | rtems_libio_rw_args_t args; |
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99 | rtems_status_code status; |
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100 | IMFS_jnode_t *the_jnode; |
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101 | |
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102 | the_jnode = iop->pathinfo.node_access; |
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103 | |
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104 | args.iop = iop; |
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105 | args.offset = iop->offset; |
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106 | args.buffer = buffer; |
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107 | args.count = count; |
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108 | args.flags = iop->flags; |
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109 | args.bytes_moved = 0; |
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110 | |
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111 | status = rtems_io_read( |
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112 | the_jnode->info.device.major, |
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113 | the_jnode->info.device.minor, |
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114 | (void *) &args |
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115 | ); |
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116 | |
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117 | if ( status ) |
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118 | return rtems_deviceio_errno(status); |
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119 | |
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120 | return (ssize_t) args.bytes_moved; |
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121 | } |
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122 | |
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123 | /* |
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124 | * device_write |
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125 | * |
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126 | * This handler maps a write() operation onto rtems_io_write(). |
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127 | */ |
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128 | |
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129 | ssize_t device_write( |
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130 | rtems_libio_t *iop, |
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131 | const void *buffer, |
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132 | size_t count |
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133 | ) |
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134 | { |
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135 | rtems_libio_rw_args_t args; |
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136 | rtems_status_code status; |
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137 | IMFS_jnode_t *the_jnode; |
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138 | |
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139 | the_jnode = iop->pathinfo.node_access; |
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140 | |
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141 | args.iop = iop; |
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142 | args.offset = iop->offset; |
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143 | args.buffer = (void *) buffer; |
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144 | args.count = count; |
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145 | args.flags = iop->flags; |
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146 | args.bytes_moved = 0; |
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147 | |
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148 | status = rtems_io_write( |
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149 | the_jnode->info.device.major, |
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150 | the_jnode->info.device.minor, |
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151 | (void *) &args |
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152 | ); |
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153 | |
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154 | if ( status ) |
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155 | return rtems_deviceio_errno(status); |
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156 | |
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157 | return (ssize_t) args.bytes_moved; |
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158 | } |
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159 | |
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160 | /* |
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161 | * device_ioctl |
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162 | * |
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163 | * This handler maps an ioctl() operation onto rtems_io_ioctl(). |
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164 | */ |
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165 | |
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166 | int device_ioctl( |
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167 | rtems_libio_t *iop, |
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168 | uint32_t command, |
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169 | void *buffer |
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170 | ) |
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171 | { |
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172 | rtems_libio_ioctl_args_t args; |
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173 | rtems_status_code status; |
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174 | IMFS_jnode_t *the_jnode; |
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175 | |
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176 | args.iop = iop; |
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177 | args.command = command; |
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178 | args.buffer = buffer; |
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179 | |
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180 | the_jnode = iop->pathinfo.node_access; |
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181 | |
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182 | status = rtems_io_control( |
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183 | the_jnode->info.device.major, |
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184 | the_jnode->info.device.minor, |
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185 | (void *) &args |
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186 | ); |
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187 | |
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188 | if ( status ) |
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189 | return rtems_deviceio_errno(status); |
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190 | |
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191 | return args.ioctl_return; |
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192 | } |
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193 | |
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194 | /* |
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195 | * device_lseek |
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196 | * |
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197 | * This handler eats all lseek() operations and does not create |
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198 | * an error. It assumes all devices can handle the seek. The |
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199 | * writes fail. |
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200 | */ |
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201 | |
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202 | off_t device_lseek( |
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203 | rtems_libio_t *iop, |
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204 | off_t offset, |
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205 | int whence |
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206 | ) |
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207 | { |
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208 | return offset; |
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209 | } |
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210 | |
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211 | /* |
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212 | * device_stat |
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213 | * |
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214 | * The IMFS_stat() is used. |
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215 | */ |
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216 | |
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217 | /* |
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218 | * device_rmnod |
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219 | * |
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220 | * The IMFS_rmnod() is used. |
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221 | */ |
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222 | |
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223 | int device_ftruncate( |
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224 | rtems_libio_t *iop, |
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225 | off_t length |
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226 | ) |
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227 | { |
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228 | return 0; |
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229 | } |
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