1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup RTEMSMedia |
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5 | * |
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6 | * @brief Media API. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2009, 2010 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Obere Lagerstr. 30 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * The license and distribution terms for this file may be |
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19 | * found in the file LICENSE in this distribution or at |
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20 | * http://www.rtems.com/license/LICENSE. |
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21 | */ |
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22 | |
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23 | #ifndef RTEMS_MEDIA_H |
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24 | #define RTEMS_MEDIA_H |
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25 | |
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26 | #include <rtems.h> |
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27 | |
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28 | #ifdef __cplusplus |
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29 | extern "C" { |
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30 | #endif /* __cplusplus */ |
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31 | |
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32 | /** |
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33 | * @defgroup RTEMSMedia Media Manager |
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34 | * |
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35 | * @brief Removable media support. |
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36 | * |
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37 | * The media manager may be used to maintain the life cycle of a removable |
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38 | * media. Currently only disk devices are supported. The initiator posts an |
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39 | * event to the media manager and it will respond with appropriate default |
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40 | * actions. For example a disk attach will lead to inspection of the partition |
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41 | * table and mounted file systems. Clients can register listeners to react to |
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42 | * events. |
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43 | * @{ |
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44 | */ |
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45 | |
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46 | #define RTEMS_MEDIA_MOUNT_BASE "/media" |
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47 | |
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48 | #define RTEMS_MEDIA_DELIMITER '-' |
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49 | |
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50 | /** |
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51 | * Disk life cycle events: |
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52 | * @dot |
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53 | * digraph disk_events { |
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54 | * "DISK ATTACH" -> "PARTITION INQUIRY"; |
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55 | * "DISK ATTACH" -> "MOUNT"; |
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56 | * "PARTITION INQUIRY" -> "PARTITION ATTACH"; |
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57 | * "PARTITION INQUIRY" -> "DISK DETACH"; |
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58 | * "PARTITION ATTACH" -> "MOUNT"; |
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59 | * "MOUNT" -> "UNMOUNT"; |
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60 | * "UNMOUNT" -> "PARTITION DETACH"; |
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61 | * "UNMOUNT" -> "DISK DETACH"; |
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62 | * "PARTITION DETACH" -> "DISK DETACH"; |
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63 | * } |
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64 | * @enddot |
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65 | */ |
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66 | typedef enum { |
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67 | RTEMS_MEDIA_EVENT_DISK_ATTACH, |
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68 | RTEMS_MEDIA_EVENT_DISK_DETACH, |
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69 | RTEMS_MEDIA_EVENT_MOUNT, |
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70 | RTEMS_MEDIA_EVENT_UNMOUNT, |
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71 | RTEMS_MEDIA_EVENT_PARTITION_INQUIRY, |
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72 | RTEMS_MEDIA_EVENT_PARTITION_ATTACH, |
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73 | RTEMS_MEDIA_EVENT_PARTITION_DETACH, |
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74 | RTEMS_MEDIA_EVENT_ERROR |
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75 | } rtems_media_event; |
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76 | |
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77 | /** |
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78 | * Normal state transition: |
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79 | * @dot |
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80 | * digraph state { |
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81 | * INQUIRY -> READY [label="all listeners\nreturned successful"]; |
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82 | * INQUIRY -> ABORTED [label="otherwise"]; |
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83 | * READY -> SUCCESS [label="the worker\nreturned successful"]; |
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84 | * READY -> FAILED [label="otherwise"]; |
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85 | * } |
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86 | * @enddot |
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87 | */ |
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88 | typedef enum { |
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89 | RTEMS_MEDIA_STATE_INQUIRY, |
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90 | RTEMS_MEDIA_STATE_READY, |
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91 | RTEMS_MEDIA_STATE_ABORTED, |
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92 | RTEMS_MEDIA_STATE_SUCCESS, |
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93 | RTEMS_MEDIA_STATE_FAILED, |
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94 | RTEMS_MEDIA_ERROR_DISK_UNKNOWN, |
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95 | RTEMS_MEDIA_ERROR_DISK_EXISTS, |
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96 | RTEMS_MEDIA_ERROR_DISK_OR_PARTITION_UNKNOWN, |
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97 | RTEMS_MEDIA_ERROR_DISK_OR_PARTITION_EXISTS, |
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98 | RTEMS_MEDIA_ERROR_PARTITION_UNKNOWN, |
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99 | RTEMS_MEDIA_ERROR_PARTITION_ORPHAN, |
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100 | RTEMS_MEDIA_ERROR_PARTITION_DETACH_WITH_MOUNT, |
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101 | RTEMS_MEDIA_ERROR_PARTITION_WITH_UNKNOWN_DISK, |
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102 | RTEMS_MEDIA_ERROR_MOUNT_POINT_UNKNOWN, |
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103 | RTEMS_MEDIA_ERROR_MOUNT_POINT_EXISTS, |
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104 | RTEMS_MEDIA_ERROR_MOUNT_POINT_ORPHAN |
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105 | } rtems_media_state; |
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106 | |
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107 | /** |
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108 | * @brief Event listener. |
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109 | * |
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110 | * The listener will be called with the @a listener_arg passed to |
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111 | * rtems_media_listener_add(). |
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112 | * |
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113 | * Source and destination values for each event and state: |
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114 | * <table> |
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115 | * <tr><th>Event</th><th>State</th><th>Source</th><th>Destination</th></tr> |
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116 | * <tr> |
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117 | * <td rowspan="5">RTEMS_MEDIA_EVENT_DISK_ATTACH</td> |
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118 | * <td>RTEMS_MEDIA_STATE_INQUIRY</td><td>driver name</td><td>NULL</td> |
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119 | * </tr> |
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120 | * <tr> |
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121 | * <td>RTEMS_MEDIA_STATE_READY</td><td>driver name</td><td>NULL</td> |
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122 | * </tr> |
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123 | * <tr> |
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124 | * <td>RTEMS_MEDIA_STATE_ABORTED</td><td>driver name</td><td>NULL</td> |
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125 | * </tr> |
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126 | * <tr> |
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127 | * <td>RTEMS_MEDIA_STATE_SUCCESS</td><td>driver name</td><td>disk path</td> |
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128 | * </tr> |
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129 | * <tr> |
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130 | * <td>RTEMS_MEDIA_STATE_FAILED</td><td>driver name</td><td>NULL</td> |
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131 | * </tr> |
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132 | * <tr> |
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133 | * <td rowspan="5">RTEMS_MEDIA_EVENT_DISK_DETACH</td> |
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134 | * <td>RTEMS_MEDIA_STATE_INQUIRY</td><td>disk path</td><td>NULL</td> |
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135 | * </tr> |
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136 | * <tr> |
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137 | * <td>RTEMS_MEDIA_STATE_READY</td><td>disk path</td><td>NULL</td> |
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138 | * </tr> |
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139 | * <tr> |
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140 | * <td>RTEMS_MEDIA_STATE_ABORTED</td><td>disk path</td><td>NULL</td> |
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141 | * </tr> |
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142 | * <tr> |
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143 | * <td>RTEMS_MEDIA_STATE_SUCCESS</td><td>disk path</td><td>NULL</td> |
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144 | * </tr> |
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145 | * <tr> |
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146 | * <td>RTEMS_MEDIA_STATE_FAILED</td><td>disk path</td><td>NULL</td> |
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147 | * </tr> |
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148 | * <tr> |
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149 | * <td rowspan="5">RTEMS_MEDIA_EVENT_PARTITION_INQUIRY</td> |
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150 | * <td>RTEMS_MEDIA_STATE_INQUIRY</td><td>disk path</td><td>NULL</td> |
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151 | * </tr> |
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152 | * <tr> |
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153 | * <td>RTEMS_MEDIA_STATE_READY</td><td>disk path</td><td>NULL</td> |
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154 | * </tr> |
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155 | * <tr> |
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156 | * <td>RTEMS_MEDIA_STATE_ABORTED</td><td>disk path</td><td>NULL</td> |
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157 | * </tr> |
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158 | * <tr> |
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159 | * <td>RTEMS_MEDIA_STATE_SUCCESS</td><td>disk path</td><td>NULL</td> |
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160 | * </tr> |
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161 | * <tr> |
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162 | * <td>RTEMS_MEDIA_STATE_FAILED</td><td>disk path</td><td>NULL</td> |
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163 | * </tr> |
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164 | * <tr> |
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165 | * <td rowspan="5">RTEMS_MEDIA_EVENT_PARTITION_ATTACH</td> |
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166 | * <td>RTEMS_MEDIA_STATE_INQUIRY</td><td>disk path</td><td>NULL</td> |
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167 | * </tr> |
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168 | * <tr> |
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169 | * <td>RTEMS_MEDIA_STATE_READY</td><td>disk path</td><td>NULL</td> |
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170 | * </tr> |
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171 | * <tr> |
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172 | * <td>RTEMS_MEDIA_STATE_ABORTED</td><td>disk path</td><td>NULL</td> |
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173 | * </tr> |
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174 | * <tr> |
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175 | * <td>RTEMS_MEDIA_STATE_SUCCESS</td> |
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176 | * <td>disk path</td><td>partition path</td> |
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177 | * </tr> |
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178 | * <tr> |
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179 | * <td>RTEMS_MEDIA_STATE_FAILED</td><td>disk path</td><td>NULL</td> |
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180 | * </tr> |
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181 | * <tr> |
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182 | * <td rowspan="5">RTEMS_MEDIA_EVENT_PARTITION_DETACH</td> |
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183 | * <td>RTEMS_MEDIA_STATE_INQUIRY</td><td>partition path</td><td>NULL</td> |
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184 | * </tr> |
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185 | * <tr> |
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186 | * <td>RTEMS_MEDIA_STATE_READY</td><td>partition path</td><td>NULL</td> |
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187 | * </tr> |
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188 | * <tr> |
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189 | * <td>RTEMS_MEDIA_STATE_ABORTED</td><td>partition path</td><td>NULL</td> |
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190 | * </tr> |
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191 | * <tr> |
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192 | * <td>RTEMS_MEDIA_STATE_SUCCESS</td><td>partition path</td><td>NULL</td> |
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193 | * </tr> |
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194 | * <tr> |
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195 | * <td>RTEMS_MEDIA_STATE_FAILED</td><td>partition path</td><td>NULL</td> |
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196 | * </tr> |
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197 | * <tr> |
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198 | * <td rowspan="5">RTEMS_MEDIA_EVENT_MOUNT</td> |
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199 | * <td>RTEMS_MEDIA_STATE_INQUIRY</td> |
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200 | * <td>disk or partition path</td><td>NULL</td> |
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201 | * </tr> |
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202 | * <tr> |
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203 | * <td>RTEMS_MEDIA_STATE_READY</td> |
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204 | * <td>disk or partition path</td><td>NULL</td> |
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205 | * </tr> |
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206 | * <tr> |
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207 | * <td>RTEMS_MEDIA_STATE_ABORTED</td> |
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208 | * <td>disk or partition path</td><td>NULL</td> |
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209 | * </tr> |
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210 | * <tr> |
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211 | * <td>RTEMS_MEDIA_STATE_SUCCESS</td> |
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212 | * <td>disk or partition path</td><td>mount path</td> |
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213 | * </tr> |
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214 | * <tr> |
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215 | * <td>RTEMS_MEDIA_STATE_FAILED</td> |
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216 | * <td>disk or partition path</td><td>NULL</td> |
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217 | * </tr> |
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218 | * <tr> |
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219 | * <td rowspan="5">RTEMS_MEDIA_EVENT_UNMOUNT</td> |
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220 | * <td>RTEMS_MEDIA_STATE_INQUIRY</td><td>mount path</td><td>NULL</td> |
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221 | * </tr> |
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222 | * <tr> |
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223 | * <td>RTEMS_MEDIA_STATE_READY</td><td>mount path</td><td>NULL</td> |
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224 | * </tr> |
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225 | * <tr> |
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226 | * <td>RTEMS_MEDIA_STATE_ABORTED</td><td>mount path</td><td>NULL</td> |
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227 | * </tr> |
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228 | * <tr> |
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229 | * <td>RTEMS_MEDIA_STATE_SUCCESS</td><td>mount path</td><td>NULL</td> |
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230 | * </tr> |
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231 | * <tr> |
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232 | * <td>RTEMS_MEDIA_STATE_FAILED</td><td>mount path</td><td>NULL</td> |
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233 | * </tr> |
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234 | * <tr> |
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235 | * <td rowspan="11">RTEMS_MEDIA_EVENT_ERROR</td> |
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236 | * <td>RTEMS_MEDIA_ERROR_DISK_UNKNOWN</td><td>disk path</td><td>NULL</td> |
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237 | * </tr> |
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238 | * <tr> |
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239 | * <td>RTEMS_MEDIA_ERROR_DISK_EXISTS</td><td>disk path</td><td>NULL</td> |
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240 | * </tr> |
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241 | * <tr> |
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242 | * <td>RTEMS_MEDIA_ERROR_DISK_OR_PARTITION_UNKNOWN</td> |
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243 | * <td>disk or partition path</td><td>NULL</td> |
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244 | * </tr> |
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245 | * <tr> |
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246 | * <td>RTEMS_MEDIA_ERROR_DISK_OR_PARTITION_EXISTS</td> |
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247 | * <td>disk or partition path</td><td>NULL</td> |
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248 | * </tr> |
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249 | * <tr> |
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250 | * <td>RTEMS_MEDIA_ERROR_PARTITION_UNKNOWN</td> |
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251 | * <td>partition path</td><td>NULL</td> |
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252 | * </tr> |
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253 | * <tr> |
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254 | * <td>RTEMS_MEDIA_ERROR_PARTITION_ORPHAN</td> |
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255 | * <td>partition path</td><td>disk path</td> |
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256 | * </tr> |
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257 | * <tr> |
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258 | * <td>RTEMS_MEDIA_ERROR_PARTITION_DETACH_WITH_MOUNT</td> |
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259 | * <td>partition path</td><td>mount path</td> |
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260 | * </tr> |
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261 | * <tr> |
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262 | * <td>RTEMS_MEDIA_ERROR_PARTITION_WITH_UNKNOWN_DISK</td> |
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263 | * <td>partition path</td><td>disk path</td> |
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264 | * </tr> |
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265 | * <tr> |
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266 | * <td>RTEMS_MEDIA_ERROR_MOUNT_POINT_UNKNOWN</td> |
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267 | * <td>mount path</td><td>NULL</td> |
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268 | * </tr> |
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269 | * <tr> |
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270 | * <td>RTEMS_MEDIA_ERROR_MOUNT_POINT_EXISTS</td> |
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271 | * <td>mount path</td><td>NULL</td> |
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272 | * </tr> |
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273 | * <tr> |
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274 | * <td>RTEMS_MEDIA_ERROR_MOUNT_POINT_ORPHAN</td> |
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275 | * <td>mount path</td><td>disk path</td> |
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276 | * </tr> |
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277 | * </table> |
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278 | * |
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279 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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280 | * @retval RTEMS_IO_ERROR In the inquiry state this will abort the action. |
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281 | */ |
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282 | typedef rtems_status_code (*rtems_media_listener)( |
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283 | rtems_media_event event, |
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284 | rtems_media_state state, |
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285 | const char *src, |
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286 | const char *dest, |
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287 | void *listener_arg |
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288 | ); |
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289 | |
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290 | /** |
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291 | * @brief Do the work corresponding to an event. |
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292 | * |
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293 | * The @a state will be |
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294 | * - RTEMS_MEDIA_STATE_READY, or |
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295 | * - RTEMS_MEDIA_STATE_ABORTED. |
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296 | * |
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297 | * It will be called with the @a src and @a worker_arg arguments passed to |
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298 | * rtems_media_post_event(). |
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299 | * |
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300 | * The destination shall be returned in @a dest in case of success. It shall |
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301 | * be allocated with malloc(). |
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302 | * |
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303 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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304 | * @retval RTEMS_IO_ERROR Failure. |
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305 | */ |
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306 | typedef rtems_status_code (*rtems_media_worker)( |
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307 | rtems_media_state state, |
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308 | const char *src, |
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309 | char **dest, |
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310 | void *worker_arg |
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311 | ); |
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312 | |
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313 | /** |
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314 | * @name Base |
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315 | * |
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316 | * @{ |
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317 | */ |
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318 | |
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319 | /** |
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320 | * @brief Initializes the media manager. |
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321 | * |
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322 | * Calling this function more than once will have no effects. There is no |
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323 | * protection against concurrent access. |
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324 | * |
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325 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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326 | * @retval RTEMS_NO_MEMORY Not enough resources. |
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327 | */ |
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328 | rtems_status_code rtems_media_initialize(void); |
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329 | |
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330 | /** |
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331 | * @brief Adds the @a listener with argument @a listener_arg. |
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332 | * |
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333 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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334 | * @retval RTEMS_NO_MEMORY Not enough memory. |
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335 | * @retval RTEMS_TOO_MANY Such a listener is already present. |
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336 | */ |
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337 | rtems_status_code rtems_media_listener_add( |
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338 | rtems_media_listener listener, |
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339 | void *listener_arg |
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340 | ); |
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341 | |
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342 | /** |
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343 | * @brief Removes the @a listener with argument @a listener_arg. |
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344 | * |
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345 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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346 | * @retval RTEMS_INVALID_ID No such listener is present. |
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347 | */ |
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348 | rtems_status_code rtems_media_listener_remove( |
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349 | rtems_media_listener listener, |
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350 | void *listener_arg |
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351 | ); |
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352 | |
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353 | /** |
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354 | * @brief Posts the @a event with source @a src. |
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355 | * |
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356 | * The @a worker will be called with the @a worker_arg argument. |
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357 | * |
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358 | * The destination will be returned in @a dest in case of success. It will be |
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359 | * allocated with malloc() and should be freed if not needed anymore. |
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360 | * |
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361 | * The work will be done by the calling thread. You can avoid this if you use |
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362 | * the media server via rtems_media_server_post_event(). |
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363 | * |
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364 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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365 | * @retval RTEMS_UNSATISFIED One or more listeners aborted the action. |
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366 | * @retval RTEMS_IO_ERROR The worker returned with an error status. |
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367 | */ |
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368 | rtems_status_code rtems_media_post_event( |
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369 | rtems_media_event event, |
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370 | const char *src, |
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371 | char **dest, |
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372 | rtems_media_worker worker, |
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373 | void *worker_arg |
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374 | ); |
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375 | |
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376 | /** @} */ |
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377 | |
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378 | /** |
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379 | * @name Server |
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380 | * |
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381 | * @{ |
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382 | */ |
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383 | |
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384 | /** |
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385 | * @brief Initializes the media manager and media server. |
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386 | * |
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387 | * It creates a server task with the @a priority, @a stack_size, @a modes, and |
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388 | * @a attributes parameters. |
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389 | * |
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390 | * Calling this function more than once will have no effects. There is no |
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391 | * protection against concurrent access. |
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392 | * |
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393 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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394 | * @retval RTEMS_NO_MEMORY Not enough resources. |
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395 | */ |
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396 | rtems_status_code rtems_media_server_initialize( |
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397 | rtems_task_priority priority, |
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398 | size_t stack_size, |
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399 | rtems_mode modes, |
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400 | rtems_attribute attributes |
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401 | ); |
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402 | |
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403 | /** |
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404 | * @brief Sends an event message to the media server. |
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405 | * |
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406 | * @see See rtems_media_post_event(). |
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407 | * |
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408 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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409 | * @retval RTEMS_NO_MEMORY Not enough resources to notify the media server. |
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410 | * @retval RTEMS_NOT_CONFIGURED Media server is not initialized. |
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411 | */ |
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412 | rtems_status_code rtems_media_server_post_event( |
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413 | rtems_media_event event, |
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414 | const char *src, |
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415 | rtems_media_worker worker, |
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416 | void *worker_arg |
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417 | ); |
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418 | |
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419 | /** |
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420 | * @brief See rtems_media_server_post_event(). |
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421 | */ |
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422 | static inline rtems_status_code rtems_media_server_disk_attach( |
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423 | const char *driver_name, |
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424 | rtems_media_worker worker, |
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425 | void *worker_arg |
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426 | ) |
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427 | { |
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428 | return rtems_media_server_post_event( |
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429 | RTEMS_MEDIA_EVENT_DISK_ATTACH, |
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430 | driver_name, |
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431 | worker, |
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432 | worker_arg |
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433 | ); |
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434 | } |
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435 | |
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436 | /** |
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437 | * @brief See rtems_media_server_post_event(). |
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438 | */ |
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439 | static inline rtems_status_code rtems_media_server_disk_detach( |
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440 | const char *disk_path |
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441 | ) |
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442 | { |
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443 | return rtems_media_server_post_event( |
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444 | RTEMS_MEDIA_EVENT_DISK_DETACH, |
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445 | disk_path, |
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446 | NULL, |
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447 | NULL |
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448 | ); |
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449 | } |
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450 | |
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451 | /** @} */ |
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452 | |
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453 | /** |
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454 | * @name Path Construction |
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455 | * |
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456 | * @{ |
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457 | */ |
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458 | |
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459 | /** |
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460 | * @brief Creates a new path as "prefix/name-major". |
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461 | * |
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462 | * @return New string, or @c NULL if no memory is available. |
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463 | */ |
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464 | char *rtems_media_create_path( |
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465 | const char *prefix, |
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466 | const char *name, |
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467 | rtems_device_major_number major |
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468 | ); |
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469 | |
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470 | /** |
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471 | * @brief Replaces the prefix of the @a path with @a new_prefix. |
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472 | * |
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473 | * The prefix is everything up to the last '/'. |
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474 | * |
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475 | * @return New string, or @c NULL if no memory is available. |
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476 | */ |
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477 | char *rtems_media_replace_prefix(const char *new_prefix, const char *path); |
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478 | |
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479 | /** |
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480 | * @brief Appends the @a minor number to the @a path resulting in "path-minor". |
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481 | * |
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482 | * @return New string, or @c NULL if no memory is available. |
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483 | */ |
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484 | char *rtems_media_append_minor( |
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485 | const char *path, |
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486 | rtems_device_minor_number minor |
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487 | ); |
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488 | |
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489 | /** @} */ |
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490 | |
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491 | /** |
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492 | * @name Support |
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493 | * |
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494 | * @{ |
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495 | */ |
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496 | |
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497 | /** |
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498 | * @brief Returns the device identifier for the device located at |
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499 | * @a device_path in @a device_identifier. |
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500 | * |
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501 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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502 | * @retval RTEMS_INVALID_ID No device at this path. |
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503 | */ |
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504 | rtems_status_code rtems_media_get_device_identifier( |
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505 | const char *device_path, |
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506 | dev_t *device_identifier |
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507 | ); |
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508 | |
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509 | const char *rtems_media_event_description(rtems_media_event event); |
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510 | |
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511 | const char *rtems_media_state_description(rtems_media_state state); |
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512 | |
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513 | /** @} */ |
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514 | |
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515 | /** @} */ |
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516 | |
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517 | #ifdef __cplusplus |
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518 | } |
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519 | #endif /* __cplusplus */ |
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520 | |
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521 | #endif /* RTEMS_MEDIA_H */ |
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