1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief LibIO Internal Interface |
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5 | * |
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6 | * This file is the libio internal interface. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * COPYRIGHT (c) 1989-2011. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * Modifications to support reference counting in the file system are |
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14 | * Copyright (c) 2012 embedded brains GmbH. |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in the file LICENSE in this distribution or at |
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18 | * http://www.rtems.org/license/LICENSE. |
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19 | */ |
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20 | |
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21 | #ifndef _RTEMS_RTEMS_LIBIO__H |
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22 | #define _RTEMS_RTEMS_LIBIO__H |
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23 | |
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24 | #include <sys/uio.h> |
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25 | #include <errno.h> |
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26 | #include <limits.h> |
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27 | #include <pthread.h> |
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28 | |
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29 | #include <rtems.h> |
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30 | #include <rtems/libio.h> |
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31 | #include <rtems/seterr.h> |
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32 | |
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33 | #ifdef __cplusplus |
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34 | extern "C" { |
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35 | #endif |
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36 | |
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37 | /** |
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38 | * @defgroup LibIOInternal IO Internal Library |
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39 | * |
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40 | * @brief Internal IO library API and implementation. |
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41 | * |
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42 | */ |
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43 | /**@{**/ |
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44 | |
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45 | #define RTEMS_FILESYSTEM_SYMLOOP_MAX 32 |
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46 | |
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47 | /* |
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48 | * Not defined in newlib so provide here. Users should use dup2 and |
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49 | * not this non-portable fcntl command. Provided here to allow the |
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50 | * RTEMS implementation to work. |
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51 | */ |
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52 | #define F_DUP2FD 20 |
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53 | |
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54 | /* |
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55 | * Semaphore to protect the io table |
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56 | */ |
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57 | |
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58 | #define RTEMS_LIBIO_SEM rtems_build_name('L', 'B', 'I', 'O') |
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59 | #define RTEMS_LIBIO_IOP_SEM(n) rtems_build_name('L', 'B', 'I', n) |
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60 | |
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61 | extern rtems_id rtems_libio_semaphore; |
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62 | |
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63 | /* |
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64 | * File descriptor Table Information |
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65 | */ |
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66 | |
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67 | extern const uint32_t rtems_libio_number_iops; |
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68 | extern rtems_libio_t rtems_libio_iops[]; |
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69 | extern rtems_libio_t *rtems_libio_iop_freelist; |
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70 | |
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71 | extern const rtems_filesystem_file_handlers_r rtems_filesystem_null_handlers; |
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72 | |
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73 | extern rtems_filesystem_mount_table_entry_t rtems_filesystem_null_mt_entry; |
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74 | |
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75 | /** |
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76 | * @brief The global null location. |
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77 | * |
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78 | * Every operation and the open and fstat handlers of this location returns an |
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79 | * error status. The errno is not touched by these operations and handlers. |
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80 | * The purpose of this location is to deliver the error return status for a |
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81 | * previous error condition which must set the errno accordingly. |
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82 | * |
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83 | * The usage of this null location instead of the NULL pointer eliminates |
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84 | * a lot of branches. |
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85 | * |
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86 | * The user environment root and current directory are statically initialized |
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87 | * with the null location. Due to that all file system services are in a |
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88 | * defined state even if no root file system was mounted. |
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89 | */ |
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90 | extern rtems_filesystem_global_location_t rtems_filesystem_global_location_null; |
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91 | |
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92 | /* |
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93 | * rtems_libio_iop |
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94 | * |
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95 | * Macro to return the file descriptor pointer. |
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96 | */ |
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97 | |
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98 | #define rtems_libio_iop(_fd) \ |
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99 | ((((uint32_t)(_fd)) < rtems_libio_number_iops) ? \ |
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100 | &rtems_libio_iops[_fd] : 0) |
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101 | |
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102 | /* |
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103 | * rtems_libio_iop_to_descriptor |
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104 | * |
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105 | * Macro to convert an internal file descriptor pointer (iop) into |
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106 | * the integer file descriptor used by the "section 2" system calls. |
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107 | */ |
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108 | |
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109 | #define rtems_libio_iop_to_descriptor(_iop) \ |
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110 | ((_iop) - &rtems_libio_iops[0]) |
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111 | |
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112 | /* |
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113 | * rtems_libio_check_is_open |
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114 | * |
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115 | * Macro to check if a file descriptor is actually open. |
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116 | */ |
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117 | |
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118 | #define rtems_libio_check_is_open(_iop) \ |
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119 | do { \ |
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120 | if (((_iop)->flags & LIBIO_FLAGS_OPEN) == 0) { \ |
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121 | errno = EBADF; \ |
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122 | return -1; \ |
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123 | } \ |
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124 | } while (0) |
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125 | |
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126 | /* |
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127 | * rtems_libio_check_fd |
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128 | * |
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129 | * Macro to check if a file descriptor number is valid. |
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130 | */ |
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131 | |
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132 | #define rtems_libio_check_fd(_fd) \ |
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133 | do { \ |
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134 | if ((uint32_t) (_fd) >= rtems_libio_number_iops) { \ |
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135 | errno = EBADF; \ |
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136 | return -1; \ |
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137 | } \ |
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138 | } while (0) |
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139 | |
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140 | /* |
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141 | * rtems_libio_check_buffer |
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142 | * |
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143 | * Macro to check if a buffer pointer is valid. |
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144 | */ |
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145 | |
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146 | #define rtems_libio_check_buffer(_buffer) \ |
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147 | do { \ |
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148 | if ((_buffer) == 0) { \ |
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149 | errno = EINVAL; \ |
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150 | return -1; \ |
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151 | } \ |
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152 | } while (0) |
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153 | |
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154 | /* |
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155 | * rtems_libio_check_count |
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156 | * |
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157 | * Macro to check if a count or length is valid. |
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158 | */ |
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159 | |
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160 | #define rtems_libio_check_count(_count) \ |
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161 | do { \ |
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162 | if ((_count) == 0) { \ |
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163 | return 0; \ |
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164 | } \ |
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165 | } while (0) |
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166 | |
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167 | /* |
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168 | * rtems_libio_check_permissions_with_error |
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169 | * |
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170 | * Macro to check if a file descriptor is open for this operation. |
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171 | * On failure, return the user specified error. |
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172 | */ |
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173 | |
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174 | #define rtems_libio_check_permissions_with_error(_iop, _flag, _errno) \ |
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175 | do { \ |
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176 | if (((_iop)->flags & (_flag)) == 0) { \ |
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177 | rtems_set_errno_and_return_minus_one( _errno ); \ |
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178 | return -1; \ |
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179 | } \ |
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180 | } while (0) |
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181 | |
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182 | /* |
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183 | * rtems_libio_check_permissions |
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184 | * |
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185 | * Macro to check if a file descriptor is open for this operation. |
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186 | * On failure, return EINVAL |
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187 | */ |
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188 | |
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189 | #define rtems_libio_check_permissions(_iop, _flag) \ |
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190 | rtems_libio_check_permissions_with_error(_iop, _flag, EINVAL ) |
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191 | |
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192 | /** |
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193 | * @brief Clones a node. |
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194 | * |
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195 | * The caller must hold the file system instance lock. |
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196 | * |
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197 | * @param[out] clone The cloned location. |
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198 | * @param[in] master The master location. |
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199 | * |
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200 | * @see rtems_filesystem_instance_lock(). |
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201 | */ |
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202 | void rtems_filesystem_location_clone( |
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203 | rtems_filesystem_location_info_t *clone, |
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204 | const rtems_filesystem_location_info_t *master |
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205 | ); |
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206 | |
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207 | /** |
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208 | * @brief Releases all resources of a location. |
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209 | * |
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210 | * This function may block on a mutex and may complete an unmount process. |
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211 | * |
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212 | * @param[in] loc The location to free. |
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213 | * |
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214 | * @note The file system root location is released by the file system |
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215 | * instance destruction handler (see @ref rtems_filesystem_fsunmount_me_t). |
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216 | * |
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217 | * @see rtems_filesystem_freenode_t. |
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218 | */ |
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219 | void rtems_filesystem_location_free( rtems_filesystem_location_info_t *loc ); |
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220 | |
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221 | /* |
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222 | * External structures |
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223 | */ |
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224 | #include <rtems/userenv.h> |
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225 | |
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226 | void rtems_libio_free_user_env( void *env ); |
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227 | |
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228 | extern pthread_key_t rtems_current_user_env_key; |
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229 | |
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230 | static inline void rtems_libio_lock( void ) |
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231 | { |
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232 | rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); |
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233 | } |
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234 | |
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235 | static inline void rtems_libio_unlock( void ) |
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236 | { |
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237 | rtems_semaphore_release( rtems_libio_semaphore ); |
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238 | } |
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239 | |
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240 | static inline void rtems_filesystem_mt_lock( void ) |
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241 | { |
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242 | rtems_libio_lock(); |
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243 | } |
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244 | |
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245 | static inline void rtems_filesystem_mt_unlock( void ) |
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246 | { |
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247 | rtems_libio_unlock(); |
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248 | } |
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249 | |
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250 | extern rtems_interrupt_lock rtems_filesystem_mt_entry_lock_control; |
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251 | |
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252 | #define rtems_filesystem_mt_entry_declare_lock_context( ctx ) \ |
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253 | rtems_interrupt_lock_context ctx |
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254 | |
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255 | #define rtems_filesystem_mt_entry_lock( ctx ) \ |
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256 | rtems_interrupt_lock_acquire( &rtems_filesystem_mt_entry_lock_control, &ctx ) |
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257 | |
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258 | #define rtems_filesystem_mt_entry_unlock( ctx ) \ |
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259 | rtems_interrupt_lock_release( &rtems_filesystem_mt_entry_lock_control, &ctx ) |
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260 | |
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261 | static inline void rtems_filesystem_instance_lock( |
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262 | const rtems_filesystem_location_info_t *loc |
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263 | ) |
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264 | { |
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265 | const rtems_filesystem_mount_table_entry_t *mt_entry = loc->mt_entry; |
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266 | |
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267 | (*mt_entry->ops->lock_h)( mt_entry ); |
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268 | } |
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269 | |
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270 | static inline void rtems_filesystem_instance_unlock( |
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271 | const rtems_filesystem_location_info_t *loc |
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272 | ) |
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273 | { |
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274 | const rtems_filesystem_mount_table_entry_t *mt_entry = loc->mt_entry; |
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275 | |
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276 | (*mt_entry->ops->unlock_h)( mt_entry ); |
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277 | } |
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278 | |
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279 | /* |
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280 | * File Descriptor Routine Prototypes |
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281 | */ |
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282 | |
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283 | /** |
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284 | * This routine searches the IOP Table for an unused entry. If it |
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285 | * finds one, it returns it. Otherwise, it returns NULL. |
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286 | */ |
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287 | rtems_libio_t *rtems_libio_allocate(void); |
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288 | |
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289 | /** |
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290 | * Convert UNIX fnctl(2) flags to ones that RTEMS drivers understand |
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291 | */ |
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292 | uint32_t rtems_libio_fcntl_flags( int fcntl_flags ); |
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293 | |
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294 | /** |
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295 | * Convert RTEMS internal flags to UNIX fnctl(2) flags |
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296 | */ |
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297 | int rtems_libio_to_fcntl_flags( uint32_t flags ); |
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298 | |
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299 | /** |
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300 | * This routine frees the resources associated with an IOP (file descriptor) |
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301 | * and clears the slot in the IOP Table. |
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302 | */ |
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303 | void rtems_libio_free( |
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304 | rtems_libio_t *iop |
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305 | ); |
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306 | |
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307 | /* |
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308 | * File System Routine Prototypes |
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309 | */ |
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310 | |
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311 | rtems_filesystem_location_info_t * |
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312 | rtems_filesystem_eval_path_start( |
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313 | rtems_filesystem_eval_path_context_t *ctx, |
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314 | const char *path, |
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315 | int eval_flags |
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316 | ); |
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317 | |
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318 | rtems_filesystem_location_info_t * |
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319 | rtems_filesystem_eval_path_start_with_parent( |
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320 | rtems_filesystem_eval_path_context_t *ctx, |
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321 | const char *path, |
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322 | int eval_flags, |
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323 | rtems_filesystem_location_info_t *parentloc, |
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324 | int parent_eval_flags |
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325 | ); |
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326 | |
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327 | rtems_filesystem_location_info_t * |
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328 | rtems_filesystem_eval_path_start_with_root_and_current( |
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329 | rtems_filesystem_eval_path_context_t *ctx, |
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330 | const char *path, |
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331 | size_t pathlen, |
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332 | int eval_flags, |
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333 | rtems_filesystem_global_location_t *const *global_root_ptr, |
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334 | rtems_filesystem_global_location_t *const *global_current_ptr |
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335 | ); |
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336 | |
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337 | void rtems_filesystem_eval_path_continue( |
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338 | rtems_filesystem_eval_path_context_t *ctx |
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339 | ); |
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340 | |
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341 | void rtems_filesystem_eval_path_cleanup( |
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342 | rtems_filesystem_eval_path_context_t *ctx |
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343 | ); |
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344 | |
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345 | void rtems_filesystem_eval_path_recursive( |
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346 | rtems_filesystem_eval_path_context_t *ctx, |
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347 | const char *path, |
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348 | size_t pathlen |
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349 | ); |
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350 | |
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351 | void rtems_filesystem_eval_path_cleanup_with_parent( |
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352 | rtems_filesystem_eval_path_context_t *ctx, |
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353 | rtems_filesystem_location_info_t *parentloc |
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354 | ); |
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355 | |
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356 | /** |
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357 | * @brief Requests a path evaluation restart. |
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358 | * |
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359 | * Sets the start and current location to the new start location. The caller |
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360 | * must terminate its current evaluation process. The path evaluation |
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361 | * continues in the next loop iteration within |
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362 | * rtems_filesystem_eval_path_continue(). This avoids recursive invocations. |
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363 | * The function obtains the new start location and clones it to set the new |
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364 | * current location. The previous start and current locations are released. |
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365 | * |
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366 | * @param[in, out] ctx The path evaluation context. |
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367 | * @param[in, out] newstartloc_ptr Pointer to the new start location. |
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368 | */ |
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369 | void rtems_filesystem_eval_path_restart( |
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370 | rtems_filesystem_eval_path_context_t *ctx, |
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371 | rtems_filesystem_global_location_t **newstartloc_ptr |
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372 | ); |
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373 | |
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374 | typedef enum { |
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375 | RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE, |
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376 | RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE, |
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377 | RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_NO_ENTRY |
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378 | } rtems_filesystem_eval_path_generic_status; |
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379 | |
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380 | /** |
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381 | * @brief Tests if the current location is a directory. |
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382 | * |
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383 | * @param[in, out] ctx The path evaluation context. |
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384 | * @param[in, out] arg The handler argument. |
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385 | * |
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386 | * @retval true The current location is a directory. |
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387 | * @retval false Otherwise. |
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388 | * |
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389 | * @see rtems_filesystem_eval_path_generic(). |
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390 | */ |
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391 | typedef bool (*rtems_filesystem_eval_path_is_directory)( |
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392 | rtems_filesystem_eval_path_context_t *ctx, |
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393 | void *arg |
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394 | ); |
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395 | |
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396 | /** |
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397 | * @brief Evaluates a token. |
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398 | * |
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399 | * @param[in, out] ctx The path evaluation context. |
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400 | * @param[in, out] arg The handler argument. |
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401 | * @param[in] token The token contents. |
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402 | * @param[in] tokenlen The token length in characters. |
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403 | * |
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404 | * @retval status The generic path evaluation status. |
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405 | * |
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406 | * @see rtems_filesystem_eval_path_generic(). |
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407 | */ |
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408 | typedef rtems_filesystem_eval_path_generic_status |
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409 | (*rtems_filesystem_eval_path_eval_token)( |
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410 | rtems_filesystem_eval_path_context_t *ctx, |
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411 | void *arg, |
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412 | const char *token, |
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413 | size_t tokenlen |
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414 | ); |
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415 | |
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416 | typedef struct { |
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417 | rtems_filesystem_eval_path_is_directory is_directory; |
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418 | rtems_filesystem_eval_path_eval_token eval_token; |
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419 | } rtems_filesystem_eval_path_generic_config; |
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420 | |
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421 | void rtems_filesystem_eval_path_generic( |
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422 | rtems_filesystem_eval_path_context_t *ctx, |
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423 | void *arg, |
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424 | const rtems_filesystem_eval_path_generic_config *config |
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425 | ); |
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426 | |
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427 | void rtems_filesystem_initialize(void); |
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428 | |
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429 | /** |
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430 | * @brief Copies a location. |
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431 | * |
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432 | * A bitwise copy is performed. The destination location will be added to the |
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433 | * corresponding mount entry. |
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434 | * |
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435 | * @param[out] dst The destination location. |
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436 | * @param[in] src The source location. |
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437 | * |
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438 | * @retval dst The destination location. |
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439 | * |
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440 | * @see rtems_filesystem_location_clone(). |
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441 | */ |
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442 | rtems_filesystem_location_info_t *rtems_filesystem_location_copy( |
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443 | rtems_filesystem_location_info_t *dst, |
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444 | const rtems_filesystem_location_info_t *src |
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445 | ); |
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446 | |
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447 | static inline rtems_filesystem_location_info_t * |
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448 | rtems_filesystem_location_initialize_to_null( |
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449 | rtems_filesystem_location_info_t *loc |
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450 | ) |
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451 | { |
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452 | return rtems_filesystem_location_copy( |
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453 | loc, |
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454 | &rtems_filesystem_global_location_null.location |
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455 | ); |
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456 | } |
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457 | |
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458 | rtems_filesystem_global_location_t * |
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459 | rtems_filesystem_location_transform_to_global( |
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460 | rtems_filesystem_location_info_t *loc |
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461 | ); |
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462 | |
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463 | /** |
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464 | * @brief Assigns a global file system location. |
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465 | * |
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466 | * @param[in, out] lhs_global_loc_ptr Pointer to the global left hand side file |
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467 | * system location. The current left hand side location will be released. |
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468 | * @param[in] rhs_global_loc The global right hand side file system location. |
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469 | */ |
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470 | void rtems_filesystem_global_location_assign( |
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471 | rtems_filesystem_global_location_t **lhs_global_loc_ptr, |
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472 | rtems_filesystem_global_location_t *rhs_global_loc |
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473 | ); |
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474 | |
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475 | /** |
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476 | * @brief Obtains a global file system location. |
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477 | * |
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478 | * Deferred releases will be processed in this function. |
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479 | * |
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480 | * This function must be called from normal thread context and may block on a |
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481 | * mutex. Thread dispatching is disabled to protect some critical sections. |
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482 | * |
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483 | * @param[in] global_loc_ptr Pointer to the global file system location. |
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484 | * |
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485 | * @return A global file system location. It returns always a valid object. |
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486 | * In case of an error, the global null location will be returned. Each |
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487 | * operation or handler of the null location returns an error status. The |
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488 | * errno indicates the error. The NULL pointer is never returned. |
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489 | * |
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490 | * @see rtems_filesystem_location_transform_to_global(), |
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491 | * rtems_filesystem_global_location_obtain_null(), and |
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492 | * rtems_filesystem_global_location_release(). |
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493 | */ |
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494 | rtems_filesystem_global_location_t *rtems_filesystem_global_location_obtain( |
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495 | rtems_filesystem_global_location_t *const *global_loc_ptr |
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496 | ); |
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497 | |
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498 | /** |
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499 | * @brief Releases a global file system location. |
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500 | * |
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501 | * In case the reference count reaches zero, all associated resources will be |
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502 | * released. This may include the complete unmount of the corresponding file |
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503 | * system instance. |
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504 | * |
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505 | * This function may block on a mutex. It may be called within critical |
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506 | * sections of the operating system. In this case the release will be |
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507 | * deferred. The next obtain call will do the actual release. |
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508 | * |
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509 | * @param[in] global_loc The global file system location. It must not be NULL. |
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510 | * @param[in] deferred If true, then do a deferred release, otherwise release |
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511 | * it immediately. |
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512 | * |
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513 | * @see rtems_filesystem_global_location_obtain(). |
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514 | */ |
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515 | void rtems_filesystem_global_location_release( |
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516 | rtems_filesystem_global_location_t *global_loc, |
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517 | bool deferred |
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518 | ); |
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519 | |
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520 | void rtems_filesystem_location_detach( |
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521 | rtems_filesystem_location_info_t *detach |
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522 | ); |
---|
523 | |
---|
524 | void rtems_filesystem_location_copy_and_detach( |
---|
525 | rtems_filesystem_location_info_t *copy, |
---|
526 | rtems_filesystem_location_info_t *detach |
---|
527 | ); |
---|
528 | |
---|
529 | static inline rtems_filesystem_global_location_t * |
---|
530 | rtems_filesystem_global_location_obtain_null(void) |
---|
531 | { |
---|
532 | rtems_filesystem_global_location_t *global_loc = NULL; |
---|
533 | |
---|
534 | return rtems_filesystem_global_location_obtain( &global_loc ); |
---|
535 | } |
---|
536 | |
---|
537 | static inline bool rtems_filesystem_location_is_null( |
---|
538 | const rtems_filesystem_location_info_t *loc |
---|
539 | ) |
---|
540 | { |
---|
541 | return loc->handlers == &rtems_filesystem_null_handlers; |
---|
542 | } |
---|
543 | |
---|
544 | static inline bool rtems_filesystem_global_location_is_null( |
---|
545 | const rtems_filesystem_global_location_t *global_loc |
---|
546 | ) |
---|
547 | { |
---|
548 | return rtems_filesystem_location_is_null( &global_loc->location ); |
---|
549 | } |
---|
550 | |
---|
551 | static inline void rtems_filesystem_location_error( |
---|
552 | const rtems_filesystem_location_info_t *loc, |
---|
553 | int eno |
---|
554 | ) |
---|
555 | { |
---|
556 | if ( !rtems_filesystem_location_is_null( loc ) ) { |
---|
557 | errno = eno; |
---|
558 | } |
---|
559 | } |
---|
560 | |
---|
561 | int rtems_filesystem_mknod( |
---|
562 | const rtems_filesystem_location_info_t *parentloc, |
---|
563 | const char *name, |
---|
564 | size_t namelen, |
---|
565 | mode_t mode, |
---|
566 | dev_t dev |
---|
567 | ); |
---|
568 | |
---|
569 | int rtems_filesystem_chdir( rtems_filesystem_location_info_t *loc ); |
---|
570 | |
---|
571 | int rtems_filesystem_chmod( |
---|
572 | const rtems_filesystem_location_info_t *loc, |
---|
573 | mode_t mode |
---|
574 | ); |
---|
575 | |
---|
576 | int rtems_filesystem_chown( |
---|
577 | const rtems_filesystem_location_info_t *loc, |
---|
578 | uid_t owner, |
---|
579 | gid_t group |
---|
580 | ); |
---|
581 | |
---|
582 | static inline bool rtems_filesystem_is_ready_for_unmount( |
---|
583 | rtems_filesystem_mount_table_entry_t *mt_entry |
---|
584 | ) |
---|
585 | { |
---|
586 | bool ready = !mt_entry->mounted |
---|
587 | && rtems_chain_has_only_one_node( &mt_entry->location_chain ) |
---|
588 | && mt_entry->mt_fs_root->reference_count == 1; |
---|
589 | |
---|
590 | if ( ready ) { |
---|
591 | rtems_chain_initialize_empty( &mt_entry->location_chain ); |
---|
592 | } |
---|
593 | |
---|
594 | return ready; |
---|
595 | } |
---|
596 | |
---|
597 | static inline void rtems_filesystem_location_add_to_mt_entry( |
---|
598 | rtems_filesystem_location_info_t *loc |
---|
599 | ) |
---|
600 | { |
---|
601 | rtems_filesystem_mt_entry_declare_lock_context( lock_context ); |
---|
602 | |
---|
603 | rtems_filesystem_mt_entry_lock( lock_context ); |
---|
604 | rtems_chain_append_unprotected( |
---|
605 | &loc->mt_entry->location_chain, |
---|
606 | &loc->mt_entry_node |
---|
607 | ); |
---|
608 | rtems_filesystem_mt_entry_unlock( lock_context ); |
---|
609 | } |
---|
610 | |
---|
611 | void rtems_filesystem_location_remove_from_mt_entry( |
---|
612 | rtems_filesystem_location_info_t *loc |
---|
613 | ); |
---|
614 | |
---|
615 | void rtems_filesystem_do_unmount( |
---|
616 | rtems_filesystem_mount_table_entry_t *mt_entry |
---|
617 | ); |
---|
618 | |
---|
619 | static inline bool rtems_filesystem_location_is_instance_root( |
---|
620 | const rtems_filesystem_location_info_t *loc |
---|
621 | ) |
---|
622 | { |
---|
623 | const rtems_filesystem_mount_table_entry_t *mt_entry = loc->mt_entry; |
---|
624 | |
---|
625 | return (*mt_entry->ops->are_nodes_equal_h)( |
---|
626 | loc, |
---|
627 | &mt_entry->mt_fs_root->location |
---|
628 | ); |
---|
629 | } |
---|
630 | |
---|
631 | static inline const char *rtems_filesystem_eval_path_get_path( |
---|
632 | rtems_filesystem_eval_path_context_t *ctx |
---|
633 | ) |
---|
634 | { |
---|
635 | return ctx->path; |
---|
636 | } |
---|
637 | |
---|
638 | static inline size_t rtems_filesystem_eval_path_get_pathlen( |
---|
639 | rtems_filesystem_eval_path_context_t *ctx |
---|
640 | ) |
---|
641 | { |
---|
642 | return ctx->pathlen; |
---|
643 | } |
---|
644 | |
---|
645 | static inline void rtems_filesystem_eval_path_set_path( |
---|
646 | rtems_filesystem_eval_path_context_t *ctx, |
---|
647 | const char *path, |
---|
648 | size_t pathlen |
---|
649 | ) |
---|
650 | { |
---|
651 | ctx->path = path; |
---|
652 | ctx->pathlen = pathlen; |
---|
653 | } |
---|
654 | |
---|
655 | static inline void rtems_filesystem_eval_path_clear_path( |
---|
656 | rtems_filesystem_eval_path_context_t *ctx |
---|
657 | ) |
---|
658 | { |
---|
659 | ctx->pathlen = 0; |
---|
660 | } |
---|
661 | |
---|
662 | static inline const char *rtems_filesystem_eval_path_get_token( |
---|
663 | rtems_filesystem_eval_path_context_t *ctx |
---|
664 | ) |
---|
665 | { |
---|
666 | return ctx->token; |
---|
667 | } |
---|
668 | |
---|
669 | static inline size_t rtems_filesystem_eval_path_get_tokenlen( |
---|
670 | rtems_filesystem_eval_path_context_t *ctx |
---|
671 | ) |
---|
672 | { |
---|
673 | return ctx->tokenlen; |
---|
674 | } |
---|
675 | |
---|
676 | static inline void rtems_filesystem_eval_path_set_token( |
---|
677 | rtems_filesystem_eval_path_context_t *ctx, |
---|
678 | const char *token, |
---|
679 | size_t tokenlen |
---|
680 | ) |
---|
681 | { |
---|
682 | ctx->token = token; |
---|
683 | ctx->tokenlen = tokenlen; |
---|
684 | } |
---|
685 | |
---|
686 | static inline void rtems_filesystem_eval_path_clear_token( |
---|
687 | rtems_filesystem_eval_path_context_t *ctx |
---|
688 | ) |
---|
689 | { |
---|
690 | ctx->tokenlen = 0; |
---|
691 | } |
---|
692 | |
---|
693 | static inline void rtems_filesystem_eval_path_put_back_token( |
---|
694 | rtems_filesystem_eval_path_context_t *ctx |
---|
695 | ) |
---|
696 | { |
---|
697 | size_t tokenlen = ctx->tokenlen; |
---|
698 | |
---|
699 | ctx->path -= tokenlen; |
---|
700 | ctx->pathlen += tokenlen; |
---|
701 | ctx->tokenlen = 0; |
---|
702 | } |
---|
703 | |
---|
704 | void rtems_filesystem_eval_path_eat_delimiter( |
---|
705 | rtems_filesystem_eval_path_context_t *ctx |
---|
706 | ); |
---|
707 | |
---|
708 | void rtems_filesystem_eval_path_next_token( |
---|
709 | rtems_filesystem_eval_path_context_t *ctx |
---|
710 | ); |
---|
711 | |
---|
712 | static inline void rtems_filesystem_eval_path_get_next_token( |
---|
713 | rtems_filesystem_eval_path_context_t *ctx, |
---|
714 | const char **token, |
---|
715 | size_t *tokenlen |
---|
716 | ) |
---|
717 | { |
---|
718 | rtems_filesystem_eval_path_next_token(ctx); |
---|
719 | *token = ctx->token; |
---|
720 | *tokenlen = ctx->tokenlen; |
---|
721 | } |
---|
722 | |
---|
723 | static inline rtems_filesystem_location_info_t * |
---|
724 | rtems_filesystem_eval_path_get_currentloc( |
---|
725 | rtems_filesystem_eval_path_context_t *ctx |
---|
726 | ) |
---|
727 | { |
---|
728 | return &ctx->currentloc; |
---|
729 | } |
---|
730 | |
---|
731 | static inline bool rtems_filesystem_eval_path_has_path( |
---|
732 | const rtems_filesystem_eval_path_context_t *ctx |
---|
733 | ) |
---|
734 | { |
---|
735 | return ctx->pathlen > 0; |
---|
736 | } |
---|
737 | |
---|
738 | static inline bool rtems_filesystem_eval_path_has_token( |
---|
739 | const rtems_filesystem_eval_path_context_t *ctx |
---|
740 | ) |
---|
741 | { |
---|
742 | return ctx->tokenlen > 0; |
---|
743 | } |
---|
744 | |
---|
745 | static inline int rtems_filesystem_eval_path_get_flags( |
---|
746 | const rtems_filesystem_eval_path_context_t *ctx |
---|
747 | ) |
---|
748 | { |
---|
749 | return ctx->flags; |
---|
750 | } |
---|
751 | |
---|
752 | static inline void rtems_filesystem_eval_path_set_flags( |
---|
753 | rtems_filesystem_eval_path_context_t *ctx, |
---|
754 | int flags |
---|
755 | ) |
---|
756 | { |
---|
757 | ctx->flags = flags; |
---|
758 | } |
---|
759 | |
---|
760 | static inline void rtems_filesystem_eval_path_clear_and_set_flags( |
---|
761 | rtems_filesystem_eval_path_context_t *ctx, |
---|
762 | int clear, |
---|
763 | int set |
---|
764 | ) |
---|
765 | { |
---|
766 | int flags = ctx->flags; |
---|
767 | |
---|
768 | flags &= ~clear; |
---|
769 | flags |= set; |
---|
770 | |
---|
771 | ctx->flags = flags; |
---|
772 | } |
---|
773 | |
---|
774 | static inline void rtems_filesystem_eval_path_extract_currentloc( |
---|
775 | rtems_filesystem_eval_path_context_t *ctx, |
---|
776 | rtems_filesystem_location_info_t *get |
---|
777 | ) |
---|
778 | { |
---|
779 | rtems_filesystem_location_copy_and_detach( |
---|
780 | get, |
---|
781 | &ctx->currentloc |
---|
782 | ); |
---|
783 | } |
---|
784 | |
---|
785 | void rtems_filesystem_eval_path_error( |
---|
786 | rtems_filesystem_eval_path_context_t *ctx, |
---|
787 | int eno |
---|
788 | ); |
---|
789 | |
---|
790 | /** |
---|
791 | * @brief Checks that the locations exist in the same file system instance. |
---|
792 | * |
---|
793 | * @retval 0 The locations exist and are in the same file system instance. |
---|
794 | * @retval -1 An error occurred. The @c errno indicates the error. |
---|
795 | */ |
---|
796 | int rtems_filesystem_location_exists_in_same_instance_as( |
---|
797 | const rtems_filesystem_location_info_t *a, |
---|
798 | const rtems_filesystem_location_info_t *b |
---|
799 | ); |
---|
800 | |
---|
801 | /** |
---|
802 | * @brief Checks if access to an object is allowed for the current user. |
---|
803 | * |
---|
804 | * If the effective UID is zero or equals the UID of the object, then the user |
---|
805 | * permission flags of the object will be used. Otherwise if the effective GID |
---|
806 | * is zero or equals the GID of the object or one of the supplementary group |
---|
807 | * IDs is equal to the GID of the object, then the group permission flags of |
---|
808 | * the object will be used. Otherwise the other permission flags of the object |
---|
809 | * will be used. |
---|
810 | * |
---|
811 | * @param[in] flags The flags determining the access type. It can be |
---|
812 | * RTEMS_FS_PERMS_READ, RTEMS_FS_PERMS_WRITE or RTEMS_FS_PERMS_EXEC. |
---|
813 | * @param[in] object_mode The mode of the object specifying the permission flags. |
---|
814 | * @param[in] object_uid The UID of the object. |
---|
815 | * @param[in] object_gid The GID of the object. |
---|
816 | * |
---|
817 | * @retval true Access is allowed. |
---|
818 | * @retval false Otherwise. |
---|
819 | */ |
---|
820 | bool rtems_filesystem_check_access( |
---|
821 | int flags, |
---|
822 | mode_t object_mode, |
---|
823 | uid_t object_uid, |
---|
824 | gid_t object_gid |
---|
825 | ); |
---|
826 | |
---|
827 | bool rtems_filesystem_eval_path_check_access( |
---|
828 | rtems_filesystem_eval_path_context_t *ctx, |
---|
829 | int eval_flags, |
---|
830 | mode_t node_mode, |
---|
831 | uid_t node_uid, |
---|
832 | gid_t node_gid |
---|
833 | ); |
---|
834 | |
---|
835 | static inline bool rtems_filesystem_is_delimiter(char c) |
---|
836 | { |
---|
837 | return c == '/' || c == '\\'; |
---|
838 | } |
---|
839 | |
---|
840 | static inline bool rtems_filesystem_is_current_directory( |
---|
841 | const char *token, |
---|
842 | size_t tokenlen |
---|
843 | ) |
---|
844 | { |
---|
845 | return tokenlen == 1 && token [0] == '.'; |
---|
846 | } |
---|
847 | |
---|
848 | static inline bool rtems_filesystem_is_parent_directory( |
---|
849 | const char *token, |
---|
850 | size_t tokenlen |
---|
851 | ) |
---|
852 | { |
---|
853 | return tokenlen == 2 && token [0] == '.' && token [1] == '.'; |
---|
854 | } |
---|
855 | |
---|
856 | static inline ssize_t rtems_libio_iovec_eval( |
---|
857 | int fd, |
---|
858 | const struct iovec *iov, |
---|
859 | int iovcnt, |
---|
860 | uint32_t flags, |
---|
861 | rtems_libio_t **iopp |
---|
862 | ) |
---|
863 | { |
---|
864 | ssize_t total; |
---|
865 | int v; |
---|
866 | rtems_libio_t *iop; |
---|
867 | |
---|
868 | rtems_libio_check_fd( fd ); |
---|
869 | iop = rtems_libio_iop( fd ); |
---|
870 | rtems_libio_check_is_open( iop ); |
---|
871 | rtems_libio_check_permissions_with_error( iop, flags, EBADF ); |
---|
872 | |
---|
873 | *iopp = iop; |
---|
874 | |
---|
875 | /* |
---|
876 | * Argument validation on IO vector |
---|
877 | */ |
---|
878 | if ( iov == NULL ) |
---|
879 | rtems_set_errno_and_return_minus_one( EINVAL ); |
---|
880 | |
---|
881 | if ( iovcnt <= 0 ) |
---|
882 | rtems_set_errno_and_return_minus_one( EINVAL ); |
---|
883 | |
---|
884 | if ( iovcnt > IOV_MAX ) |
---|
885 | rtems_set_errno_and_return_minus_one( EINVAL ); |
---|
886 | |
---|
887 | /* |
---|
888 | * OpenGroup says that you are supposed to return EINVAL if the |
---|
889 | * sum of the iov_len values in the iov array would overflow a |
---|
890 | * ssize_t. |
---|
891 | */ |
---|
892 | total = 0; |
---|
893 | for ( v = 0 ; v < iovcnt ; ++v ) { |
---|
894 | size_t len = iov[ v ].iov_len; |
---|
895 | |
---|
896 | if ( len > ( size_t ) ( SSIZE_MAX - total ) ) { |
---|
897 | rtems_set_errno_and_return_minus_one( EINVAL ); |
---|
898 | } |
---|
899 | |
---|
900 | total += ( ssize_t ) len; |
---|
901 | |
---|
902 | if ( iov[ v ].iov_base == NULL && len != 0 ) { |
---|
903 | rtems_set_errno_and_return_minus_one( EINVAL ); |
---|
904 | } |
---|
905 | } |
---|
906 | |
---|
907 | return total; |
---|
908 | } |
---|
909 | |
---|
910 | /** |
---|
911 | * @brief Returns the file type of the file referenced by the filesystem |
---|
912 | * location. |
---|
913 | * |
---|
914 | * @brief[in] loc The filesystem location. |
---|
915 | * |
---|
916 | * @return The type of the file or an invalid file type in case of an error. |
---|
917 | */ |
---|
918 | static inline mode_t rtems_filesystem_location_type( |
---|
919 | const rtems_filesystem_location_info_t *loc |
---|
920 | ) |
---|
921 | { |
---|
922 | struct stat st; |
---|
923 | |
---|
924 | st.st_mode = 0; |
---|
925 | (void) ( *loc->handlers->fstat_h )( loc, &st ); |
---|
926 | |
---|
927 | return st.st_mode; |
---|
928 | } |
---|
929 | |
---|
930 | /** @} */ |
---|
931 | |
---|
932 | #ifdef __cplusplus |
---|
933 | } |
---|
934 | #endif |
---|
935 | |
---|
936 | #endif |
---|
937 | /* end of include file */ |
---|