1 | /** |
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2 | * @file rtems/termiostypes.h |
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3 | * |
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4 | * RTEMS termios device support internal data structures |
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5 | */ |
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6 | |
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7 | /* |
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8 | * COPYRIGHT (c) 1989-2011. |
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9 | * On-Line Applications Research Corporation (OAR). |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.org/license/LICENSE. |
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14 | */ |
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15 | |
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16 | #ifndef __TERMIOSTYPES_H |
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17 | #define __TERMIOSTYPES_H |
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18 | |
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19 | #include <rtems.h> |
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20 | #include <rtems/libio.h> |
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21 | #include <rtems/assoc.h> |
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22 | #include <rtems/chain.h> |
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23 | #include <stdint.h> |
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24 | #include <termios.h> |
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25 | |
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26 | #ifdef __cplusplus |
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27 | extern "C" { |
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28 | #endif |
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29 | |
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30 | /** |
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31 | * @defgroup TermiostypesSupport RTEMS Termios Device Support |
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32 | * |
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33 | * @ingroup libcsupport |
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34 | * |
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35 | * @brief RTEMS Termios Device Support Internal Data Structures |
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36 | */ |
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37 | |
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38 | /* |
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39 | * Wakeup callback data structure |
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40 | */ |
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41 | struct ttywakeup { |
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42 | void (*sw_pfn)(struct termios *tty, void *arg); |
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43 | void *sw_arg; |
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44 | }; |
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45 | |
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46 | /* |
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47 | * Variables associated with the character buffer |
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48 | */ |
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49 | struct rtems_termios_rawbuf { |
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50 | char *theBuf; |
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51 | volatile unsigned int Head; |
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52 | volatile unsigned int Tail; |
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53 | volatile unsigned int Size; |
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54 | rtems_id Semaphore; |
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55 | }; |
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56 | |
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57 | typedef enum { |
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58 | TERMIOS_POLLED, |
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59 | TERMIOS_IRQ_DRIVEN, |
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60 | TERMIOS_TASK_DRIVEN, |
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61 | TERMIOS_IRQ_SERVER_DRIVEN |
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62 | } rtems_termios_device_mode; |
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63 | |
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64 | struct rtems_termios_tty; |
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65 | |
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66 | /** |
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67 | * @brief Termios device context. |
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68 | * |
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69 | * @see RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER(), |
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70 | * rtems_termios_device_context_initialize() and |
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71 | * rtems_termios_device_install(). |
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72 | */ |
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73 | typedef struct rtems_termios_device_context { |
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74 | union { |
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75 | /* Used for TERMIOS_POLLED and TERMIOS_IRQ_DRIVEN */ |
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76 | rtems_interrupt_lock interrupt; |
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77 | |
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78 | /* Used for TERMIOS_IRQ_SERVER_DRIVEN or TERMIOS_TASK_DRIVEN */ |
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79 | rtems_id mutex; |
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80 | } lock; |
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81 | |
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82 | void ( *lock_acquire )( |
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83 | struct rtems_termios_device_context *, |
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84 | rtems_interrupt_lock_context * |
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85 | ); |
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86 | |
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87 | void ( *lock_release )( |
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88 | struct rtems_termios_device_context *, |
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89 | rtems_interrupt_lock_context * |
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90 | ); |
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91 | } rtems_termios_device_context; |
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92 | |
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93 | void rtems_termios_device_lock_acquire_default( |
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94 | rtems_termios_device_context *ctx, |
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95 | rtems_interrupt_lock_context *lock_context |
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96 | ); |
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97 | |
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98 | void rtems_termios_device_lock_release_default( |
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99 | rtems_termios_device_context *ctx, |
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100 | rtems_interrupt_lock_context *lock_context |
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101 | ); |
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102 | |
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103 | /** |
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104 | * @brief Initializes a device context. |
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105 | * |
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106 | * @param[in] context The Termios device context. |
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107 | * @param[in] name The name for the interrupt lock. This name must be a |
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108 | * string persistent throughout the life time of this lock. The name is only |
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109 | * used if profiling is enabled. |
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110 | */ |
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111 | RTEMS_INLINE_ROUTINE void rtems_termios_device_context_initialize( |
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112 | rtems_termios_device_context *context, |
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113 | const char *name |
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114 | ) |
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115 | { |
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116 | rtems_interrupt_lock_initialize( &context->lock.interrupt, name ); |
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117 | context->lock_acquire = rtems_termios_device_lock_acquire_default; |
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118 | context->lock_release = rtems_termios_device_lock_release_default; |
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119 | } |
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120 | |
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121 | /** |
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122 | * @brief Initializer for static initialization of Termios device contexts. |
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123 | * |
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124 | * @param name The name for the interrupt lock. It must be a string. The name |
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125 | * is only used if profiling is enabled. |
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126 | */ |
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127 | #define RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER( name ) \ |
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128 | { \ |
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129 | { RTEMS_INTERRUPT_LOCK_INITIALIZER( name ) }, \ |
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130 | rtems_termios_device_lock_acquire_default, \ |
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131 | rtems_termios_device_lock_release_default \ |
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132 | } |
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133 | |
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134 | /** |
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135 | * @brief Termios device handler. |
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136 | * |
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137 | * @see rtems_termios_device_install(). |
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138 | */ |
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139 | typedef struct { |
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140 | /** |
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141 | * @brief First open of this device. |
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142 | * |
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143 | * @param[in] tty The Termios control. This parameter may be passed to |
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144 | * interrupt service routines since it must be provided for the |
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145 | * rtems_termios_enqueue_raw_characters() and |
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146 | * rtems_termios_dequeue_characters() functions. |
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147 | * @param[in] context The Termios device context. |
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148 | * @param[in] term The current Termios attributes. |
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149 | * @param[in] args The open/close arguments. This is parameter provided to |
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150 | * support legacy drivers. It must not be used by new drivers. |
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151 | * |
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152 | * @retval true Successful operation. |
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153 | * @retval false Cannot open device. |
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154 | * |
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155 | * @see rtems_termios_get_device_context() and rtems_termios_set_best_baud(). |
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156 | */ |
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157 | bool (*first_open)( |
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158 | struct rtems_termios_tty *tty, |
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159 | rtems_termios_device_context *context, |
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160 | struct termios *term, |
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161 | rtems_libio_open_close_args_t *args |
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162 | ); |
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163 | |
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164 | /** |
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165 | * @brief Last close of this device. |
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166 | * |
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167 | * @param[in] tty The Termios control. |
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168 | * @param[in] context The Termios device context. |
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169 | * @param[in] args The open/close arguments. This is parameter provided to |
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170 | * support legacy drivers. It must not be used by new drivers. |
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171 | */ |
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172 | void (*last_close)( |
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173 | struct rtems_termios_tty *tty, |
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174 | rtems_termios_device_context *context, |
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175 | rtems_libio_open_close_args_t *args |
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176 | ); |
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177 | |
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178 | /** |
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179 | * @brief Polled read. |
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180 | * |
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181 | * In case mode is TERMIOS_IRQ_DRIVEN, TERMIOS_IRQ_SERVER_DRIVEN or |
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182 | * TERMIOS_TASK_DRIVEN, then data is received via |
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183 | * rtems_termios_enqueue_raw_characters(). |
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184 | * |
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185 | * @param[in] context The Termios device context. |
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186 | * |
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187 | * @retval char The received data encoded as unsigned char. |
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188 | * @retval -1 No data currently available. |
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189 | */ |
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190 | int (*poll_read)(rtems_termios_device_context *context); |
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191 | |
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192 | /** |
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193 | * @brief Polled write in case mode is TERMIOS_POLLED or write support |
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194 | * otherwise. |
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195 | * |
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196 | * @param[in] context The Termios device context. |
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197 | * @param[in] buf The output buffer. |
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198 | * @param[in] len The output buffer length in characters. |
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199 | */ |
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200 | void (*write)( |
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201 | rtems_termios_device_context *context, |
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202 | const char *buf, |
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203 | size_t len |
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204 | ); |
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205 | |
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206 | /** |
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207 | * @brief Set attributes after a Termios settings change. |
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208 | * |
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209 | * @param[in] context The Termios device context. |
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210 | * @param[in] term The new Termios attributes. |
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211 | * |
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212 | * @retval true Successful operation. |
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213 | * @retval false Invalid attributes. |
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214 | */ |
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215 | bool (*set_attributes)( |
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216 | rtems_termios_device_context *context, |
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217 | const struct termios *term |
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218 | ); |
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219 | |
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220 | /** |
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221 | * @brief IO control handler. |
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222 | * |
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223 | * Invoked in case the Termios layer cannot deal with the IO request. |
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224 | * |
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225 | * @param[in] context The Termios device context. |
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226 | * @param[in] request The IO control request. |
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227 | * @param[in] buffer The IO control buffer. |
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228 | */ |
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229 | int (*ioctl)( |
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230 | rtems_termios_device_context *context, |
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231 | ioctl_command_t request, |
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232 | void *buffer |
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233 | ); |
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234 | |
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235 | /** |
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236 | * @brief Termios device mode. |
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237 | */ |
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238 | rtems_termios_device_mode mode; |
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239 | } rtems_termios_device_handler; |
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240 | |
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241 | /** |
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242 | * @brief Termios device flow control handler. |
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243 | * |
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244 | * @see rtems_termios_device_install(). |
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245 | */ |
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246 | typedef struct { |
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247 | /** |
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248 | * @brief Indicate to stop remote transmitter. |
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249 | * |
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250 | * @param[in] context The Termios device context. |
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251 | */ |
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252 | void (*stop_remote_tx)(rtems_termios_device_context *context); |
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253 | |
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254 | /** |
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255 | * @brief Indicate to start remote transmitter. |
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256 | * |
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257 | * @param[in] context The Termios device context. |
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258 | */ |
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259 | void (*start_remote_tx)(rtems_termios_device_context *context); |
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260 | } rtems_termios_device_flow; |
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261 | |
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262 | /** |
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263 | * @brief Termios device node for installed devices. |
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264 | * |
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265 | * @see rtems_termios_device_install(). |
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266 | */ |
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267 | typedef struct rtems_termios_device_node { |
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268 | rtems_chain_node node; |
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269 | rtems_device_major_number major; |
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270 | rtems_device_minor_number minor; |
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271 | const rtems_termios_device_handler *handler; |
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272 | const rtems_termios_device_flow *flow; |
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273 | rtems_termios_device_context *context; |
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274 | struct rtems_termios_tty *tty; |
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275 | } rtems_termios_device_node; |
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276 | |
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277 | /* |
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278 | * Variables associated with each termios instance. |
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279 | * One structure for each hardware I/O device. |
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280 | */ |
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281 | typedef struct rtems_termios_tty { |
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282 | /* |
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283 | * Linked-list of active TERMIOS devices |
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284 | */ |
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285 | struct rtems_termios_tty *forw; |
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286 | struct rtems_termios_tty *back; |
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287 | |
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288 | /* |
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289 | * How many times has this device been opened |
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290 | */ |
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291 | int refcount; |
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292 | |
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293 | /* |
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294 | * This device |
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295 | */ |
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296 | rtems_device_major_number major; |
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297 | rtems_device_minor_number minor; |
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298 | |
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299 | /* |
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300 | * Mutual-exclusion semaphores |
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301 | */ |
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302 | rtems_id isem; |
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303 | rtems_id osem; |
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304 | |
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305 | /* |
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306 | * The canonical (cooked) character buffer |
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307 | */ |
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308 | char *cbuf; |
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309 | int ccount; |
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310 | int cindex; |
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311 | |
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312 | /* |
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313 | * Keep track of cursor (printhead) position |
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314 | */ |
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315 | int column; |
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316 | int read_start_column; |
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317 | |
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318 | /* |
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319 | * The ioctl settings |
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320 | */ |
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321 | struct termios termios; |
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322 | rtems_interval vtimeTicks; |
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323 | |
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324 | /* |
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325 | * Raw input character buffer |
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326 | */ |
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327 | struct rtems_termios_rawbuf rawInBuf; |
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328 | uint32_t rawInBufSemaphoreOptions; |
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329 | rtems_interval rawInBufSemaphoreTimeout; |
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330 | rtems_interval rawInBufSemaphoreFirstTimeout; |
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331 | unsigned int rawInBufDropped; /* Statistics */ |
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332 | |
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333 | /* |
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334 | * Raw output character buffer |
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335 | */ |
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336 | struct rtems_termios_rawbuf rawOutBuf; |
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337 | int t_dqlen; /* count of characters dequeued from device */ |
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338 | enum {rob_idle, rob_busy, rob_wait } rawOutBufState; |
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339 | |
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340 | /* |
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341 | * Callbacks to device-specific routines |
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342 | */ |
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343 | rtems_termios_callbacks device; |
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344 | |
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345 | /** |
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346 | * @brief Context for legacy devices using the callbacks. |
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347 | */ |
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348 | rtems_termios_device_context legacy_device_context; |
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349 | |
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350 | /** |
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351 | * @brief The device handler. |
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352 | */ |
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353 | rtems_termios_device_handler handler; |
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354 | |
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355 | /** |
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356 | * @brief The device flow control handler. |
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357 | */ |
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358 | rtems_termios_device_flow flow; |
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359 | |
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360 | volatile unsigned int flow_ctrl; |
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361 | unsigned int lowwater,highwater; |
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362 | |
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363 | /* |
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364 | * I/O task IDs (for task-driven drivers) |
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365 | */ |
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366 | rtems_id rxTaskId; |
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367 | rtems_id txTaskId; |
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368 | |
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369 | /* |
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370 | * line discipline related stuff |
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371 | */ |
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372 | int t_line; /* id of line discipline */ |
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373 | void *t_sc; /* hook for discipline-specific data structure */ |
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374 | |
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375 | /* |
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376 | * Wakeup callback variables |
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377 | */ |
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378 | struct ttywakeup tty_snd; |
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379 | struct ttywakeup tty_rcv; |
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380 | bool tty_rcvwakeup; |
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381 | |
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382 | /** |
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383 | * @brief Corresponding device node. |
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384 | */ |
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385 | rtems_termios_device_node *device_node; |
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386 | |
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387 | /** |
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388 | * @brief Context for device driver. |
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389 | */ |
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390 | rtems_termios_device_context *device_context; |
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391 | } rtems_termios_tty; |
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392 | |
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393 | /** |
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394 | * @brief Installs a Termios device. |
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395 | * |
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396 | * The installed Termios device may be removed via unlink(). |
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397 | * |
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398 | * @param[in] device_file The device file path. |
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399 | * @param[in] handler The device handler. It must be persistent throughout the |
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400 | * installed time of the device. |
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401 | * @param[in] flow The device flow control handler. The device flow control |
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402 | * handler are optional and may be @c NULL. If present must be persistent |
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403 | * throughout the installed time of the device. |
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404 | * @param[in] context The device context. It must be persistent throughout the |
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405 | * installed time of the device. |
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406 | * |
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407 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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408 | * @retval RTEMS_NO_MEMORY Not enough memory to create a device node. |
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409 | * @retval RTEMS_UNSATISFIED Creation of the device file failed. |
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410 | * @retval RTEMS_INCORRECT_STATE Termios is not initialized. |
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411 | * |
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412 | * @see rtems_termios_get_device_context(). |
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413 | */ |
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414 | rtems_status_code rtems_termios_device_install( |
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415 | const char *device_file, |
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416 | const rtems_termios_device_handler *handler, |
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417 | const rtems_termios_device_flow *flow, |
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418 | rtems_termios_device_context *context |
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419 | ); |
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420 | |
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421 | /** |
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422 | * @brief Returns the device context of an installed Termios device. |
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423 | * |
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424 | * @param[in] tty The Termios control. |
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425 | */ |
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426 | RTEMS_INLINE_ROUTINE void *rtems_termios_get_device_context( |
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427 | const rtems_termios_tty *tty |
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428 | ) |
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429 | { |
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430 | return tty->device_context; |
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431 | } |
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432 | |
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433 | /** |
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434 | * @brief Acquires the device lock. |
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435 | * |
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436 | * @param[in] context The device context. |
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437 | * @param[in] lock_context The local interrupt lock context for an acquire and |
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438 | * release pair. |
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439 | */ |
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440 | RTEMS_INLINE_ROUTINE void rtems_termios_device_lock_acquire( |
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441 | rtems_termios_device_context *context, |
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442 | rtems_interrupt_lock_context *lock_context |
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443 | ) |
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444 | { |
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445 | ( *context->lock_acquire )( context, lock_context ); |
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446 | } |
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447 | |
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448 | /** |
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449 | * @brief Releases the device lock. |
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450 | * |
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451 | * @param[in] context The device context. |
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452 | * @param[in] lock_context The local interrupt lock context for an acquire and |
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453 | * release pair. |
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454 | */ |
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455 | RTEMS_INLINE_ROUTINE void rtems_termios_device_lock_release( |
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456 | rtems_termios_device_context *context, |
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457 | rtems_interrupt_lock_context *lock_context |
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458 | ) |
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459 | { |
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460 | ( *context->lock_release )( context, lock_context ); |
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461 | } |
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462 | |
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463 | /** |
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464 | * @brief Sets the best baud value in the Termios control. |
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465 | * |
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466 | * The valid Termios baud values are between 0 and 460800. The Termios baud |
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467 | * value is chosen which minimizes the difference to the value specified. |
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468 | * |
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469 | * @param[in] term The Termios attributes. |
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470 | * @param[in] baud The current baud setting of the device. |
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471 | */ |
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472 | void rtems_termios_set_best_baud( |
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473 | struct termios *term, |
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474 | uint32_t baud |
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475 | ); |
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476 | |
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477 | struct rtems_termios_linesw { |
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478 | int (*l_open) (struct rtems_termios_tty *tp); |
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479 | int (*l_close)(struct rtems_termios_tty *tp); |
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480 | int (*l_read )(struct rtems_termios_tty *tp,rtems_libio_rw_args_t *args); |
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481 | int (*l_write)(struct rtems_termios_tty *tp,rtems_libio_rw_args_t *args); |
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482 | int (*l_rint )(int c,struct rtems_termios_tty *tp); |
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483 | int (*l_start)(struct rtems_termios_tty *tp); |
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484 | int (*l_ioctl)(struct rtems_termios_tty *tp,rtems_libio_ioctl_args_t *args); |
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485 | int (*l_modem)(struct rtems_termios_tty *tp,int flags); |
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486 | }; |
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487 | |
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488 | /* |
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489 | * FIXME: this should move to termios.h! |
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490 | */ |
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491 | void rtems_termios_rxirq_occured(struct rtems_termios_tty *tty); |
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492 | |
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493 | /* |
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494 | * FIXME: this should move to termios.h! |
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495 | * put a string to output ring buffer |
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496 | */ |
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497 | void rtems_termios_puts ( |
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498 | const void *buf, |
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499 | size_t len, |
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500 | struct rtems_termios_tty *tty |
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501 | ); |
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502 | |
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503 | /* |
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504 | * global hooks for line disciplines |
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505 | */ |
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506 | extern struct rtems_termios_linesw rtems_termios_linesw[]; |
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507 | extern int rtems_termios_nlinesw; |
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508 | |
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509 | #define TTYDISC 0 /* termios tty line discipline */ |
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510 | #define TABLDISC 3 /* tablet discipline */ |
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511 | #define SLIPDISC 4 /* serial IP discipline */ |
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512 | #define PPPDISC 5 /* PPP discipline */ |
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513 | #define MAXLDISC 8 |
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514 | |
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515 | /* baudrate xxx integer type */ |
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516 | typedef uint32_t rtems_termios_baud_t; |
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517 | |
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518 | /** |
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519 | * @brief RTEMS Termios Baud Table |
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520 | */ |
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521 | extern const rtems_assoc_t rtems_termios_baud_table []; |
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522 | |
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523 | /** |
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524 | * @brief Converts the Integral Baud value @a baud to the Termios Control Flag |
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525 | * Representation |
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526 | * |
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527 | * @retval B0 Invalid baud value or a baud value of 0. |
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528 | * @retval other Baud constant according to @a baud. |
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529 | */ |
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530 | tcflag_t rtems_termios_number_to_baud(rtems_termios_baud_t baud); |
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531 | |
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532 | /** |
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533 | * @brief Convert Baud Part of Termios control flags to an integral Baud Value |
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534 | * |
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535 | * There is no need to mask the @a c_cflag with @c CBAUD. |
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536 | * |
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537 | * @retval 0 Invalid baud value or a baud value of @c B0. |
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538 | * @retval other Integral baud value. |
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539 | */ |
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540 | rtems_termios_baud_t rtems_termios_baud_to_number(tcflag_t c_cflag); |
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541 | |
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542 | /** |
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543 | * @brief Convert Bxxx Constant to Index |
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544 | */ |
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545 | int rtems_termios_baud_to_index(rtems_termios_baud_t termios_baud); |
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546 | |
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547 | /** |
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548 | * @brief Sets the initial @a baud in the Termios context @a tty. |
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549 | * |
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550 | * @retval 0 Successful operation. |
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551 | * @retval -1 Invalid baud value. |
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552 | */ |
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553 | int rtems_termios_set_initial_baud( |
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554 | struct rtems_termios_tty *tty, |
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555 | rtems_termios_baud_t baud |
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556 | ); |
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557 | |
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558 | /** |
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559 | * @brief Termios kqueue() filter filesystem node handler |
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560 | * |
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561 | * Real implementation is provided by libbsd. |
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562 | */ |
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563 | int rtems_termios_kqfilter( |
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564 | rtems_libio_t *iop, |
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565 | struct knote *kn |
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566 | ); |
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567 | |
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568 | /** |
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569 | * @brief Termios poll() filesystem node handler. |
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570 | * |
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571 | * Real implementation is provided by libbsd. |
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572 | */ |
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573 | int rtems_termios_poll( |
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574 | rtems_libio_t *iop, |
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575 | int events |
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576 | ); |
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577 | |
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578 | #ifdef __cplusplus |
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579 | } |
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580 | #endif |
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581 | |
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582 | #endif /* TERMIOSTYPES_H */ |
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