1 | /* |
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2 | * COPYRIGHT (c) 1989-2008. |
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3 | * On-Line Applications Research Corporation (OAR). |
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4 | * |
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5 | * Modifications to support reference counting in the file system are |
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6 | * Copyright (c) 2012 embedded brains GmbH. |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.rtems.com/license/LICENSE. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #if HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <sys/stat.h> |
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20 | |
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21 | #include <rtems/libio_.h> |
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22 | |
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23 | static int null_handler_open( |
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24 | rtems_libio_t *iop, |
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25 | const char *path, |
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26 | int oflag, |
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27 | mode_t mode |
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28 | ) |
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29 | { |
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30 | return -1; |
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31 | } |
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32 | |
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33 | static int null_handler_fstat( |
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34 | const rtems_filesystem_location_info_t *pathloc, |
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35 | struct stat *buf |
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36 | ) |
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37 | { |
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38 | return -1; |
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39 | } |
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40 | |
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41 | const rtems_filesystem_file_handlers_r rtems_filesystem_null_handlers = { |
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42 | .open_h = null_handler_open, |
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43 | .close_h = rtems_filesystem_default_close, |
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44 | .read_h = rtems_filesystem_default_read, |
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45 | .write_h = rtems_filesystem_default_write, |
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46 | .ioctl_h = rtems_filesystem_default_ioctl, |
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47 | .lseek_h = rtems_filesystem_default_lseek, |
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48 | .fstat_h = null_handler_fstat, |
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49 | .ftruncate_h = rtems_filesystem_default_ftruncate, |
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50 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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51 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, |
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52 | .fcntl_h = rtems_filesystem_default_fcntl |
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53 | }; |
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54 | |
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55 | static void null_op_lock_or_unlock( |
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56 | rtems_filesystem_mount_table_entry_t *mt_entry |
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57 | ) |
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58 | { |
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59 | /* Do nothing */ |
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60 | } |
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61 | |
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62 | static int null_op_mknod( |
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63 | const rtems_filesystem_location_info_t *parentloc, |
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64 | const char *name, |
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65 | size_t namelen, |
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66 | mode_t mode, |
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67 | dev_t dev |
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68 | ) |
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69 | { |
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70 | return -1; |
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71 | } |
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72 | |
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73 | static int null_op_rmnod( |
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74 | const rtems_filesystem_location_info_t *parentloc, |
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75 | const rtems_filesystem_location_info_t *loc |
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76 | ) |
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77 | { |
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78 | return -1; |
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79 | } |
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80 | |
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81 | static int null_op_link( |
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82 | const rtems_filesystem_location_info_t *parentloc, |
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83 | const rtems_filesystem_location_info_t *targetloc, |
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84 | const char *name, |
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85 | size_t namelen |
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86 | ) |
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87 | { |
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88 | return -1; |
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89 | } |
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90 | |
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91 | static int null_op_fchmod( |
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92 | const rtems_filesystem_location_info_t *pathloc, |
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93 | mode_t mode |
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94 | ) |
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95 | { |
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96 | return -1; |
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97 | } |
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98 | |
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99 | static int null_op_chown( |
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100 | const rtems_filesystem_location_info_t *loc, |
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101 | uid_t owner, |
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102 | gid_t group |
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103 | ) |
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104 | { |
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105 | return -1; |
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106 | } |
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107 | |
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108 | static int null_op_clonenode( |
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109 | rtems_filesystem_location_info_t *loc |
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110 | ) |
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111 | { |
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112 | return -1; |
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113 | } |
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114 | |
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115 | static int null_op_mount( |
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116 | rtems_filesystem_mount_table_entry_t *mt_entry |
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117 | ) |
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118 | { |
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119 | return -1; |
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120 | } |
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121 | |
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122 | static int null_op_fsmount_me( |
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123 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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124 | const void *data |
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125 | ) |
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126 | { |
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127 | return -1; |
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128 | } |
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129 | |
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130 | static int null_op_unmount( |
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131 | rtems_filesystem_mount_table_entry_t *mt_entry |
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132 | ) |
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133 | { |
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134 | return -1; |
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135 | } |
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136 | |
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137 | static void null_op_fsunmount_me( |
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138 | rtems_filesystem_mount_table_entry_t *mt_entry |
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139 | ) |
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140 | { |
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141 | /* Do nothing */ |
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142 | } |
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143 | |
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144 | static int null_op_utime( |
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145 | const rtems_filesystem_location_info_t *loc, |
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146 | time_t actime, |
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147 | time_t modtime |
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148 | ) |
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149 | { |
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150 | return -1; |
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151 | } |
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152 | |
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153 | static int null_op_symlink( |
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154 | const rtems_filesystem_location_info_t *parentloc, |
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155 | const char *name, |
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156 | size_t namelen, |
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157 | const char *target |
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158 | ) |
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159 | { |
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160 | return -1; |
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161 | } |
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162 | |
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163 | static ssize_t null_op_readlink( |
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164 | const rtems_filesystem_location_info_t *loc, |
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165 | char *buf, |
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166 | size_t bufsize |
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167 | ) |
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168 | { |
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169 | return -1; |
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170 | } |
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171 | |
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172 | static int null_op_rename( |
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173 | const rtems_filesystem_location_info_t *oldparentloc, |
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174 | const rtems_filesystem_location_info_t *oldloc, |
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175 | const rtems_filesystem_location_info_t *newparentloc, |
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176 | const char *name, |
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177 | size_t namelen |
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178 | ) |
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179 | { |
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180 | return -1; |
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181 | } |
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182 | |
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183 | static int null_op_statvfs( |
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184 | const rtems_filesystem_location_info_t *loc, |
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185 | struct statvfs *buf |
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186 | ) |
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187 | { |
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188 | return -1; |
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189 | } |
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190 | |
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191 | static const rtems_filesystem_operations_table null_ops = { |
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192 | .lock_h = null_op_lock_or_unlock, |
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193 | .unlock_h = null_op_lock_or_unlock, |
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194 | .eval_path_h = rtems_filesystem_default_eval_path, |
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195 | .link_h = null_op_link, |
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196 | .are_nodes_equal_h = rtems_filesystem_default_are_nodes_equal, |
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197 | .node_type_h = rtems_filesystem_default_node_type, |
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198 | .mknod_h = null_op_mknod, |
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199 | .rmnod_h = null_op_rmnod, |
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200 | .fchmod_h = null_op_fchmod, |
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201 | .chown_h = null_op_chown, |
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202 | .clonenod_h = null_op_clonenode, |
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203 | .freenod_h = rtems_filesystem_default_freenode, |
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204 | .mount_h = null_op_mount, |
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205 | .fsmount_me_h = null_op_fsmount_me, |
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206 | .unmount_h = null_op_unmount, |
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207 | .fsunmount_me_h = null_op_fsunmount_me, |
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208 | .utime_h = null_op_utime, |
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209 | .symlink_h = null_op_symlink, |
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210 | .readlink_h = null_op_readlink, |
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211 | .rename_h = null_op_rename, |
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212 | .statvfs_h = null_op_statvfs |
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213 | }; |
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214 | |
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215 | rtems_filesystem_mount_table_entry_t rtems_filesystem_null_mt_entry = { |
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216 | .location_chain = { |
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217 | .Head = { |
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218 | .Node = { |
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219 | .next = &rtems_filesystem_global_location_null.location.mt_entry_node, |
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220 | .previous = NULL |
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221 | }, |
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222 | .fill = &rtems_filesystem_global_location_null.location.mt_entry_node, |
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223 | } |
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224 | }, |
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225 | .mt_point_node = &rtems_filesystem_global_location_null, |
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226 | .mt_fs_root = &rtems_filesystem_global_location_null, |
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227 | .mounted = false, |
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228 | .writeable = false |
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229 | }; |
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230 | |
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231 | rtems_filesystem_global_location_t rtems_filesystem_global_location_null = { |
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232 | .location = { |
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233 | .mt_entry_node = { |
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234 | .next = &rtems_filesystem_null_mt_entry.location_chain.Tail.Node, |
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235 | .previous = &rtems_filesystem_null_mt_entry.location_chain.Head.Node |
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236 | }, |
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237 | .handlers = &rtems_filesystem_null_handlers, |
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238 | .ops = &null_ops, |
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239 | .mt_entry = &rtems_filesystem_null_mt_entry |
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240 | }, |
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241 | |
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242 | /* |
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243 | * The initial reference count accounts for the following references |
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244 | * o the root directory of the user environment, |
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245 | * o the current directory of the user environment, |
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246 | * o the root node of the null file system instance, and |
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247 | * o the mount point node of the null file system instance. |
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248 | */ |
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249 | .reference_count = 4 |
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250 | }; |
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251 | |
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252 | rtems_user_env_t rtems_global_user_env = { |
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253 | .current_directory = &rtems_filesystem_global_location_null, |
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254 | .root_directory = &rtems_filesystem_global_location_null, |
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255 | .umask = S_IWGRP | S_IWOTH |
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256 | }; |
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257 | |
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258 | rtems_user_env_t *rtems_current_user_env = &rtems_global_user_env; |
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