1 | /* $Id: serialport-posix.cpp 76908 2019-01-21 08:28:43Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Serial Port API, POSIX Implementation.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2017-2019 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #include <iprt/serialport.h>
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32 | #include "internal/iprt.h"
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33 |
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34 | #include <iprt/asm.h>
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35 | #include <iprt/assert.h>
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36 | #include <iprt/cdefs.h>
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37 | #include <iprt/err.h>
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38 | #include <iprt/mem.h>
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39 | #include <iprt/string.h>
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40 | #include <iprt/thread.h>
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41 | #include <iprt/time.h>
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42 | #include "internal/magics.h"
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43 |
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44 | #include <errno.h>
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45 | #ifdef RT_OS_SOLARIS
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46 | # include <sys/termios.h>
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47 | #else
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48 | # include <termios.h>
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49 | #endif
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50 | #include <sys/types.h>
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51 | #include <fcntl.h>
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52 | #include <string.h>
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53 | #include <unistd.h>
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54 | #ifdef RT_OS_DARWIN
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55 | # include <sys/poll.h>
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56 | #else
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57 | # include <sys/poll.h>
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58 | #endif
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59 | #include <sys/ioctl.h>
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60 | #include <pthread.h>
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61 |
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62 | #ifdef RT_OS_LINUX
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63 | /*
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64 | * TIOCM_LOOP is not defined in the above header files for some reason but in asm/termios.h.
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65 | * But inclusion of this file however leads to compilation errors because of redefinition of some
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66 | * structs. That's why it is defined here until a better solution is found.
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67 | */
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68 | # ifndef TIOCM_LOOP
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69 | # define TIOCM_LOOP 0x8000
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70 | # endif
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71 | /* For linux custom baudrate code we also need serial_struct */
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72 | # include <linux/serial.h>
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73 | #endif /* linux */
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74 |
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75 | /** Define fallback if not supported. */
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76 | #if !defined(CMSPAR)
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77 | # define CMSPAR 0
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78 | #endif
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79 |
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80 |
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81 | /*********************************************************************************************************************************
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82 | * Structures and Typedefs *
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83 | *********************************************************************************************************************************/
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84 |
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85 | /**
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86 | * Internal serial port state.
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87 | */
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88 | typedef struct RTSERIALPORTINTERNAL
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89 | {
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90 | /** Magic value (RTSERIALPORT_MAGIC). */
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91 | uint32_t u32Magic;
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92 | /** Flags given while opening the serial port. */
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93 | uint32_t fOpenFlags;
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94 | /** The file descriptor of the serial port. */
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95 | int iFd;
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96 | /** The status line monitor thread if enabled. */
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97 | RTTHREAD hMonThrd;
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98 | /** Flag whether the monitoring thread should shutdown. */
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99 | volatile bool fMonThrdShutdown;
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100 | /** Reading end of wakeup pipe. */
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101 | int iFdPipeR;
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102 | /** Writing end of wakeup pipe. */
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103 | int iFdPipeW;
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104 | /** Event pending mask. */
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105 | volatile uint32_t fEvtsPending;
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106 | /** Flag whether we are in blocking or non blocking mode. */
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107 | bool fBlocking;
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108 | /** The current active config (we assume no one changes this behind our back). */
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109 | struct termios PortCfg;
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110 | /** Flag whether a custom baud rate was chosen (for hosts supporting this.). */
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111 | bool fBaudrateCust;
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112 | /** The custom baud rate. */
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113 | uint32_t uBaudRateCust;
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114 | } RTSERIALPORTINTERNAL;
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115 | /** Pointer to the internal serial port state. */
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116 | typedef RTSERIALPORTINTERNAL *PRTSERIALPORTINTERNAL;
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117 |
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118 |
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119 | /**
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120 | * Baud rate conversion table descriptor.
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121 | */
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122 | typedef struct RTSERIALPORTBRATECONVDESC
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123 | {
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124 | /** The platform independent baud rate used by the RTSerialPort* API. */
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125 | uint32_t uBaudRateCfg;
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126 | /** The speed identifier used in the termios structure. */
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127 | speed_t iSpeedTermios;
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128 | } RTSERIALPORTBRATECONVDESC;
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129 | /** Pointer to a baud rate converions table descriptor. */
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130 | typedef RTSERIALPORTBRATECONVDESC *PRTSERIALPORTBRATECONVDESC;
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131 | /** Pointer to a const baud rate conversion table descriptor. */
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132 | typedef const RTSERIALPORTBRATECONVDESC *PCRTSERIALPORTBRATECONVDESC;
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133 |
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134 |
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135 | /*********************************************************************************************************************************
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136 | * Defined Constants And Macros *
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137 | *********************************************************************************************************************************/
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138 |
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139 | /** The event poller was woken up due to an external interrupt. */
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140 | #define RTSERIALPORT_WAKEUP_PIPE_REASON_INTERRUPT 0x0
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141 | /** The event poller was woken up due to a change in the monitored status lines. */
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142 | #define RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_CHANGED 0x1
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143 | /** The monitor thread encoutnered repeating errors querying the status lines and terminated. */
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144 | #define RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_MONITOR_FAILED 0x2
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145 |
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146 |
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147 | /*********************************************************************************************************************************
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148 | * Global variables *
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149 | *********************************************************************************************************************************/
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150 |
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151 | /** The baud rate conversion table. */
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152 | static const RTSERIALPORTBRATECONVDESC s_rtSerialPortBaudrateConv[] =
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153 | {
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154 | { 50, B50 },
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155 | { 75, B75 },
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156 | { 110, B110 },
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157 | { 134, B134 },
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158 | { 150, B150 },
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159 | { 200, B200 },
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160 | { 300, B300 },
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161 | { 600, B600 },
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162 | { 1200, B1200 },
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163 | { 1800, B1800 },
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164 | { 2400, B2400 },
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165 | { 4800, B4800 },
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166 | { 9600, B9600 },
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167 | { 19200, B19200 },
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168 | { 38400, B38400 },
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169 | { 57600, B57600 },
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170 | { 115200, B115200 }
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171 | };
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172 |
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173 |
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174 |
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175 | /*********************************************************************************************************************************
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176 | * Internal Functions *
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177 | *********************************************************************************************************************************/
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178 |
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179 | /**
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180 | * Converts the given termios speed identifier to the baud rate used in the API.
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181 | *
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182 | * @returns Baud rate or 0 if not a standard baud rate
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183 | */
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184 | DECLINLINE(uint32_t) rtSerialPortGetBaudrateFromTermiosSpeed(speed_t enmSpeed)
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185 | {
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186 | for (unsigned i = 0; i < RT_ELEMENTS(s_rtSerialPortBaudrateConv); i++)
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187 | {
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188 | if (s_rtSerialPortBaudrateConv[i].iSpeedTermios == enmSpeed)
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189 | return s_rtSerialPortBaudrateConv[i].uBaudRateCfg;
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190 | }
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191 |
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192 | return 0;
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193 | }
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194 |
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195 |
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196 | /**
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197 | * Converts the given baud rate to proper termios speed identifier.
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198 | *
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199 | * @returns Speed identifier if available or B0 if no matching speed for the baud rate
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200 | * could be found.
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201 | * @param uBaudRate The baud rate to convert.
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202 | * @param pfBaudrateCust Where to store the flag whether a custom baudrate was selected.
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203 | */
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204 | DECLINLINE(speed_t) rtSerialPortGetTermiosSpeedFromBaudrate(uint32_t uBaudRate, bool *pfBaudrateCust)
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205 | {
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206 | *pfBaudrateCust = false;
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207 |
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208 | for (unsigned i = 0; i < RT_ELEMENTS(s_rtSerialPortBaudrateConv); i++)
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209 | {
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210 | if (s_rtSerialPortBaudrateConv[i].uBaudRateCfg == uBaudRate)
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211 | return s_rtSerialPortBaudrateConv[i].iSpeedTermios;
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212 | }
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213 |
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214 | #ifdef RT_OS_LINUX
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215 | *pfBaudrateCust = true;
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216 | return B38400;
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217 | #else
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218 | return B0;
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219 | #endif
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220 | }
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221 |
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222 |
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223 | /**
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224 | * Tries to set the default config on the given serial port.
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225 | *
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226 | * @returns IPRT status code.
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227 | * @param pThis The internal serial port instance data.
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228 | */
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229 | static int rtSerialPortSetDefaultCfg(PRTSERIALPORTINTERNAL pThis)
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230 | {
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231 | pThis->fBaudrateCust = false;
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232 | pThis->uBaudRateCust = 0;
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233 | pThis->PortCfg.c_iflag = INPCK; /* Input parity checking. */
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234 | cfsetispeed(&pThis->PortCfg, B9600);
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235 | cfsetospeed(&pThis->PortCfg, B9600);
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236 | pThis->PortCfg.c_cflag |= CS8 | CLOCAL; /* 8 data bits, ignore modem control lines. */
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237 | if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_READ)
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238 | pThis->PortCfg.c_cflag |= CREAD; /* Enable receiver. */
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239 |
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240 | /* Set to raw input mode. */
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241 | pThis->PortCfg.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHONL | ECHOK | ISIG | IEXTEN);
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242 | pThis->PortCfg.c_cc[VMIN] = 0; /* Achieve non-blocking behavior. */
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243 | pThis->PortCfg.c_cc[VTIME] = 0;
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244 |
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245 | int rc = VINF_SUCCESS;
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246 | int rcPsx = tcflush(pThis->iFd, TCIOFLUSH);
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247 | if (!rcPsx)
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248 | {
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249 | rcPsx = tcsetattr(pThis->iFd, TCSANOW, &pThis->PortCfg);
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250 | if (rcPsx == -1)
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251 | rc = RTErrConvertFromErrno(errno);
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252 |
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253 | if (RT_SUCCESS(rc))
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254 | {
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255 | #ifdef RT_OS_LINUX
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256 | if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_ENABLE_LOOPBACK)
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257 | {
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258 | int fTiocmSet = TIOCM_LOOP;
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259 | rcPsx = ioctl(pThis->iFd, TIOCMBIS, &fTiocmSet);
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260 | if (rcPsx == -1)
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261 | rc = RTErrConvertFromErrno(errno);
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262 | }
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263 | else
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264 | {
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265 | /* Make sure it is clear. */
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266 | int fTiocmClear = TIOCM_LOOP;
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267 | rcPsx = ioctl(pThis->iFd, TIOCMBIC, &fTiocmClear);
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268 | if (rcPsx == -1 && errno != EINVAL) /* Pseudo terminals don't support loopback mode so ignore an error here. */
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269 | rc = RTErrConvertFromErrno(errno);
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270 | }
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271 | #else
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272 | if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_ENABLE_LOOPBACK)
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273 | return VERR_NOT_SUPPORTED;
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274 | #endif
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275 | }
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276 | }
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277 | else
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278 | rc = RTErrConvertFromErrno(errno);
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279 |
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280 | return rc;
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281 | }
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282 |
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283 |
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284 | /**
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285 | * Converts the given serial port config to the appropriate termios counterpart.
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286 | *
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287 | * @returns IPRT status code.
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288 | * @param pThis The internal serial port instance data.
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289 | * @param pCfg Pointer to the serial port config descriptor.
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290 | * @param pTermios Pointer to the termios structure to fill.
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291 | * @param pfBaudrateCust Where to store the flag whether a custom baudrate was selected.
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292 | * @param pErrInfo Additional error to be set when the conversion fails.
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293 | */
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294 | static int rtSerialPortCfg2Termios(PRTSERIALPORTINTERNAL pThis, PCRTSERIALPORTCFG pCfg, struct termios *pTermios,
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295 | bool *pfBaudrateCust, PRTERRINFO pErrInfo)
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296 | {
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297 | RT_NOREF(pErrInfo); /** @todo Make use of the error info. */
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298 | speed_t enmSpeed = rtSerialPortGetTermiosSpeedFromBaudrate(pCfg->uBaudRate, pfBaudrateCust);
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299 | if (enmSpeed != B0)
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300 | {
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301 | tcflag_t const fCFlagMask = (CS5 | CS6 | CS7 | CS8 | CSTOPB | PARENB | PARODD | CMSPAR);
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302 | tcflag_t fCFlagNew = 0;
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303 |
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304 | switch (pCfg->enmDataBitCount)
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305 | {
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306 | case RTSERIALPORTDATABITS_5BITS:
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307 | fCFlagNew |= CS5;
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308 | break;
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309 | case RTSERIALPORTDATABITS_6BITS:
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310 | fCFlagNew |= CS6;
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311 | break;
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312 | case RTSERIALPORTDATABITS_7BITS:
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313 | fCFlagNew |= CS7;
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314 | break;
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315 | case RTSERIALPORTDATABITS_8BITS:
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316 | fCFlagNew |= CS8;
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317 | break;
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318 | default:
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319 | AssertFailed();
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320 | return VERR_INVALID_PARAMETER;
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321 | }
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322 |
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323 | switch (pCfg->enmParity)
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324 | {
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325 | case RTSERIALPORTPARITY_NONE:
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326 | break;
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327 | case RTSERIALPORTPARITY_EVEN:
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328 | fCFlagNew |= PARENB;
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329 | break;
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330 | case RTSERIALPORTPARITY_ODD:
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331 | fCFlagNew |= PARENB | PARODD;
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332 | break;
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333 | #if CMSPAR != 0
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334 | case RTSERIALPORTPARITY_MARK:
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335 | fCFlagNew |= PARENB | CMSPAR | PARODD;
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336 | break;
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337 | case RTSERIALPORTPARITY_SPACE:
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338 | fCFlagNew |= PARENB | CMSPAR;
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339 | break;
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340 | #else
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341 | case RTSERIALPORTPARITY_MARK:
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342 | case RTSERIALPORTPARITY_SPACE:
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343 | return VERR_NOT_SUPPORTED;
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344 | #endif
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345 | default:
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346 | AssertFailed();
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347 | return VERR_INVALID_PARAMETER;
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348 | }
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349 |
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350 | switch (pCfg->enmStopBitCount)
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351 | {
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352 | case RTSERIALPORTSTOPBITS_ONE:
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353 | break;
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354 | case RTSERIALPORTSTOPBITS_ONEPOINTFIVE:
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355 | if (pCfg->enmDataBitCount == RTSERIALPORTDATABITS_5BITS)
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356 | fCFlagNew |= CSTOPB;
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357 | else
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358 | return VERR_NOT_SUPPORTED;
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359 | break;
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360 | case RTSERIALPORTSTOPBITS_TWO:
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361 | if (pCfg->enmDataBitCount != RTSERIALPORTDATABITS_5BITS)
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362 | fCFlagNew |= CSTOPB;
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363 | else
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364 | return VERR_NOT_SUPPORTED;
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365 | break;
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366 | default:
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367 | AssertFailed();
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368 | return VERR_INVALID_PARAMETER;
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369 | }
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370 |
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371 | /* Assign new flags. */
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372 | if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_READ)
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373 | pTermios->c_cflag |= CREAD; /* Enable receiver. */
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374 | pTermios->c_cflag = (pTermios->c_cflag & ~fCFlagMask) | fCFlagNew;
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375 | pTermios->c_lflag &= ~(ICANON | ECHO | ECHOE | ECHONL | ECHOK | ISIG | IEXTEN);
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376 | pTermios->c_iflag = INPCK; /* Input parity checking. */
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377 | pTermios->c_cc[VMIN] = 0; /* Achieve non-blocking behavior. */
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378 | pTermios->c_cc[VTIME] = 0;
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379 | cfsetispeed(pTermios, enmSpeed);
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380 | cfsetospeed(pTermios, enmSpeed);
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381 | }
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382 | else
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383 | return VERR_SERIALPORT_INVALID_BAUDRATE;
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384 |
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385 | return VINF_SUCCESS;
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386 | }
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387 |
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388 |
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389 | /**
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390 | * Converts the given termios structure to an appropriate serial port config.
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391 | *
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392 | * @returns IPRT status code.
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393 | * @param pThis The internal serial port instance data.
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394 | * @param pTermios The termios structure to convert.
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395 | * @param pCfg The serial port config to fill in.
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396 | */
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397 | static int rtSerialPortTermios2Cfg(PRTSERIALPORTINTERNAL pThis, struct termios *pTermios, PRTSERIALPORTCFG pCfg)
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398 | {
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399 | int rc = VINF_SUCCESS;
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400 | bool f5DataBits = false;
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401 | speed_t enmSpeedIn = cfgetispeed(pTermios);
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402 | Assert(enmSpeedIn == cfgetospeed(pTermios)); /* Should always be the same. */
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403 |
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404 | if (!pThis->fBaudrateCust)
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405 | {
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406 | pCfg->uBaudRate = rtSerialPortGetBaudrateFromTermiosSpeed(enmSpeedIn);
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407 | if (!pCfg->uBaudRate)
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408 | rc = VERR_SERIALPORT_INVALID_BAUDRATE;
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409 | }
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410 | else
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411 | pCfg->uBaudRate = pThis->uBaudRateCust;
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412 |
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413 | switch (pTermios->c_cflag & CSIZE)
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414 | {
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415 | case CS5:
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416 | pCfg->enmDataBitCount = RTSERIALPORTDATABITS_5BITS;
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417 | f5DataBits = true;
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418 | break;
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419 | case CS6:
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420 | pCfg->enmDataBitCount = RTSERIALPORTDATABITS_6BITS;
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421 | break;
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422 | case CS7:
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423 | pCfg->enmDataBitCount = RTSERIALPORTDATABITS_7BITS;
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424 | break;
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425 | case CS8:
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426 | pCfg->enmDataBitCount = RTSERIALPORTDATABITS_8BITS;
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427 | break;
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428 | default:
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429 | AssertFailed(); /* Should not happen. */
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430 | pCfg->enmDataBitCount = RTSERIALPORTDATABITS_INVALID;
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431 | rc = RT_FAILURE(rc) ? rc : VERR_INVALID_PARAMETER;
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432 | }
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433 |
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434 | /* Convert parity. */
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435 | if (pTermios->c_cflag & PARENB)
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436 | {
|
---|
437 | /*
|
---|
438 | * CMSPAR is not supported on all systems, especially OS X. As configuring
|
---|
439 | * mark/space parity there is not supported and we start from a known config
|
---|
440 | * when opening the serial port it is not required to check for this here.
|
---|
441 | */
|
---|
442 | #if CMSPAR == 0
|
---|
443 | bool fCmsParSet = RT_BOOL(pTermios->c_cflag & CMSPAR);
|
---|
444 | #else
|
---|
445 | bool fCmsParSet = false;
|
---|
446 | #endif
|
---|
447 | if (pTermios->c_cflag & PARODD)
|
---|
448 | pCfg->enmParity = fCmsParSet ? RTSERIALPORTPARITY_MARK : RTSERIALPORTPARITY_ODD;
|
---|
449 | else
|
---|
450 | pCfg->enmParity = fCmsParSet ? RTSERIALPORTPARITY_SPACE: RTSERIALPORTPARITY_EVEN;
|
---|
451 | }
|
---|
452 | else
|
---|
453 | pCfg->enmParity = RTSERIALPORTPARITY_NONE;
|
---|
454 |
|
---|
455 | /*
|
---|
456 | * 1.5 stop bits are used with a data count of 5 bits when a UART derived from the 8250
|
---|
457 | * is used.
|
---|
458 | */
|
---|
459 | if (pTermios->c_cflag & CSTOPB)
|
---|
460 | pCfg->enmStopBitCount = f5DataBits ? RTSERIALPORTSTOPBITS_ONEPOINTFIVE : RTSERIALPORTSTOPBITS_TWO;
|
---|
461 | else
|
---|
462 | pCfg->enmStopBitCount = RTSERIALPORTSTOPBITS_ONE;
|
---|
463 |
|
---|
464 | return rc;
|
---|
465 | }
|
---|
466 |
|
---|
467 |
|
---|
468 | /**
|
---|
469 | * Wakes up any thread polling for a serial port event with the given reason.
|
---|
470 | *
|
---|
471 | * @returns IPRT status code.
|
---|
472 | * @param pThis The internal serial port instance data.
|
---|
473 | * @param bWakeupReason The wakeup reason to pass to the event poller.
|
---|
474 | */
|
---|
475 | DECLINLINE(int) rtSerialPortWakeupEvtPoller(PRTSERIALPORTINTERNAL pThis, uint8_t bWakeupReason)
|
---|
476 | {
|
---|
477 | int rcPsx = write(pThis->iFdPipeW, &bWakeupReason, 1);
|
---|
478 | if (rcPsx != 1)
|
---|
479 | return RTErrConvertFromErrno(errno);
|
---|
480 |
|
---|
481 | return VINF_SUCCESS;
|
---|
482 | }
|
---|
483 |
|
---|
484 |
|
---|
485 | /**
|
---|
486 | * The status line monitor thread worker.
|
---|
487 | *
|
---|
488 | * @returns IPRT status code.
|
---|
489 | * @param ThreadSelf Thread handle to this thread.
|
---|
490 | * @param pvUser User argument.
|
---|
491 | */
|
---|
492 | static DECLCALLBACK(int) rtSerialPortStsLineMonitorThrd(RTTHREAD hThreadSelf, void *pvUser)
|
---|
493 | {
|
---|
494 | RT_NOREF(hThreadSelf);
|
---|
495 | PRTSERIALPORTINTERNAL pThis = (PRTSERIALPORTINTERNAL)pvUser;
|
---|
496 | unsigned long const fStsLinesChk = TIOCM_CAR | TIOCM_RNG | TIOCM_DSR | TIOCM_CTS;
|
---|
497 | int rc = VINF_SUCCESS;
|
---|
498 | uint32_t fStsLinesOld = 0;
|
---|
499 | uint32_t cStsLineGetErrors = 0;
|
---|
500 | #ifdef RT_OS_LINUX
|
---|
501 | bool fPoll = false;
|
---|
502 | #endif
|
---|
503 |
|
---|
504 | RTThreadUserSignal(hThreadSelf);
|
---|
505 |
|
---|
506 | int rcPsx = ioctl(pThis->iFd, TIOCMGET, &fStsLinesOld);
|
---|
507 | if (rcPsx == -1)
|
---|
508 | {
|
---|
509 | ASMAtomicXchgBool(&pThis->fMonThrdShutdown, true);
|
---|
510 | return RTErrConvertFromErrno(errno);
|
---|
511 | }
|
---|
512 |
|
---|
513 | while ( !pThis->fMonThrdShutdown
|
---|
514 | && RT_SUCCESS(rc))
|
---|
515 | {
|
---|
516 | # ifdef RT_OS_LINUX
|
---|
517 | /*
|
---|
518 | * Wait for status line change.
|
---|
519 | *
|
---|
520 | * XXX In Linux, if a thread calls tcsetattr while the monitor thread is
|
---|
521 | * waiting in ioctl for a modem status change then 8250.c wrongly disables
|
---|
522 | * modem irqs and so the monitor thread never gets released. The workaround
|
---|
523 | * is to send a signal after each tcsetattr.
|
---|
524 | *
|
---|
525 | * TIOCMIWAIT doesn't work for the DSR line with TIOCM_DSR set
|
---|
526 | * (see http://lxr.linux.no/#linux+v4.7/drivers/usb/class/cdc-acm.c#L949)
|
---|
527 | * However as it is possible to query the line state we will not just clear
|
---|
528 | * the TIOCM_DSR bit from the lines to check but resort to the polling
|
---|
529 | * approach just like on other hosts.
|
---|
530 | */
|
---|
531 | if (!fPoll)
|
---|
532 | {
|
---|
533 | rcPsx = ioctl(pThis->iFd, TIOCMIWAIT, fStsLinesChk);
|
---|
534 | if (!rcPsx)
|
---|
535 | {
|
---|
536 | rc = rtSerialPortWakeupEvtPoller(pThis, RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_CHANGED);
|
---|
537 | if (RT_FAILURE(rc))
|
---|
538 | break;
|
---|
539 | }
|
---|
540 | else if (rcPsx == -1 && errno != EINTR)
|
---|
541 | fPoll = true;
|
---|
542 | }
|
---|
543 | else
|
---|
544 | #endif
|
---|
545 | {
|
---|
546 | uint32_t fStsLines = 0;
|
---|
547 | rcPsx = ioctl(pThis->iFd, TIOCMGET, &fStsLines);
|
---|
548 | if (!rcPsx)
|
---|
549 | {
|
---|
550 | cStsLineGetErrors = 0; /* Reset the error counter once we had one successful query. */
|
---|
551 |
|
---|
552 | if (((fStsLines ^ fStsLinesOld) & fStsLinesChk))
|
---|
553 | {
|
---|
554 | rc = rtSerialPortWakeupEvtPoller(pThis, RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_CHANGED);
|
---|
555 | if (RT_FAILURE(rc))
|
---|
556 | break;
|
---|
557 |
|
---|
558 | fStsLinesOld = fStsLines;
|
---|
559 | }
|
---|
560 | else /* No change, sleep for a bit. */
|
---|
561 | RTThreadSleep(100 /*ms*/);
|
---|
562 | }
|
---|
563 | else if (rcPsx == -1 && errno != EINTR)
|
---|
564 | {
|
---|
565 | /*
|
---|
566 | * If querying the status line fails too often we have to shut down the
|
---|
567 | * thread and notify the user of the serial port.
|
---|
568 | */
|
---|
569 | if (cStsLineGetErrors++ >= 10)
|
---|
570 | {
|
---|
571 | rc = RTErrConvertFromErrno(errno);
|
---|
572 | rtSerialPortWakeupEvtPoller(pThis, RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_MONITOR_FAILED);
|
---|
573 | break;
|
---|
574 | }
|
---|
575 |
|
---|
576 | RTThreadSleep(100 /*ms*/);
|
---|
577 | }
|
---|
578 | }
|
---|
579 | }
|
---|
580 |
|
---|
581 | ASMAtomicXchgBool(&pThis->fMonThrdShutdown, true);
|
---|
582 | return rc;
|
---|
583 | }
|
---|
584 |
|
---|
585 |
|
---|
586 | /**
|
---|
587 | * Creates the status line monitoring thread.
|
---|
588 | *
|
---|
589 | * @returns IPRT status code.
|
---|
590 | * @param pThis The internal serial port instance data.
|
---|
591 | */
|
---|
592 | static int rtSerialPortMonitorThreadCreate(PRTSERIALPORTINTERNAL pThis)
|
---|
593 | {
|
---|
594 | int rc = VINF_SUCCESS;
|
---|
595 |
|
---|
596 | /*
|
---|
597 | * Check whether querying the status lines is supported at all, pseudo terminals
|
---|
598 | * don't support it so an error returned in that case.
|
---|
599 | */
|
---|
600 | uint32_t fStsLines = 0;
|
---|
601 | int rcPsx = ioctl(pThis->iFd, TIOCMGET, &fStsLines);
|
---|
602 | if (!rcPsx)
|
---|
603 | {
|
---|
604 | pThis->fMonThrdShutdown = false;
|
---|
605 | rc = RTThreadCreate(&pThis->hMonThrd, rtSerialPortStsLineMonitorThrd, pThis, 0 /*cbStack*/,
|
---|
606 | RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "IPRT-SerPortMon");
|
---|
607 | if (RT_SUCCESS(rc))
|
---|
608 | {
|
---|
609 | /* Wait for the thread to start up. */
|
---|
610 | rc = RTThreadUserWait(pThis->hMonThrd, 20*RT_MS_1SEC);
|
---|
611 | if ( rc == VERR_TIMEOUT
|
---|
612 | || pThis->fMonThrdShutdown)
|
---|
613 | {
|
---|
614 | /* Startup failed, try to reap the thread. */
|
---|
615 | int rcThrd;
|
---|
616 | rc = RTThreadWait(pThis->hMonThrd, 20*RT_MS_1SEC, &rcThrd);
|
---|
617 | if (RT_SUCCESS(rc))
|
---|
618 | rc = rcThrd;
|
---|
619 | else
|
---|
620 | rc = VERR_INTERNAL_ERROR;
|
---|
621 | /* The thread is lost otherwise. */
|
---|
622 | }
|
---|
623 | }
|
---|
624 | }
|
---|
625 | else if (errno == ENOTTY || errno == EINVAL)
|
---|
626 | rc = VERR_NOT_SUPPORTED;
|
---|
627 | else
|
---|
628 | rc = RTErrConvertFromErrno(errno);
|
---|
629 |
|
---|
630 | return rc;
|
---|
631 | }
|
---|
632 |
|
---|
633 |
|
---|
634 | /**
|
---|
635 | * Shuts down the status line monitor thread.
|
---|
636 | *
|
---|
637 | * @returns nothing.
|
---|
638 | * @param pThis The internal serial port instance data.
|
---|
639 | */
|
---|
640 | static void rtSerialPortMonitorThreadShutdown(PRTSERIALPORTINTERNAL pThis)
|
---|
641 | {
|
---|
642 | bool fShutDown = ASMAtomicXchgBool(&pThis->fMonThrdShutdown, true);
|
---|
643 | if (!fShutDown)
|
---|
644 | {
|
---|
645 | int rc = RTThreadPoke(pThis->hMonThrd);
|
---|
646 | AssertRC(rc);
|
---|
647 | }
|
---|
648 |
|
---|
649 | int rcThrd = VINF_SUCCESS;
|
---|
650 | int rc = RTThreadWait(pThis->hMonThrd, 20*RT_MS_1SEC, &rcThrd);
|
---|
651 | AssertRC(rc);
|
---|
652 | AssertRC(rcThrd);
|
---|
653 | }
|
---|
654 |
|
---|
655 |
|
---|
656 | /**
|
---|
657 | * The slow path of rtSerialPortSwitchBlockingMode that does the actual switching.
|
---|
658 | *
|
---|
659 | * @returns IPRT status code.
|
---|
660 | * @param pThis The internal serial port instance data.
|
---|
661 | * @param fBlocking The desired mode of operation.
|
---|
662 | * @remarks Do not call directly.
|
---|
663 | */
|
---|
664 | static int rtSerialPortSwitchBlockingModeSlow(PRTSERIALPORTINTERNAL pThis, bool fBlocking)
|
---|
665 | {
|
---|
666 | int fFlags = fcntl(pThis->iFd, F_GETFL, 0);
|
---|
667 | if (fFlags == -1)
|
---|
668 | return RTErrConvertFromErrno(errno);
|
---|
669 |
|
---|
670 | if (fBlocking)
|
---|
671 | fFlags &= ~O_NONBLOCK;
|
---|
672 | else
|
---|
673 | fFlags |= O_NONBLOCK;
|
---|
674 | if (fcntl(pThis->iFd, F_SETFL, fFlags) == -1)
|
---|
675 | return RTErrConvertFromErrno(errno);
|
---|
676 |
|
---|
677 | pThis->fBlocking = fBlocking;
|
---|
678 | return VINF_SUCCESS;
|
---|
679 | }
|
---|
680 |
|
---|
681 |
|
---|
682 | /**
|
---|
683 | * Switches the serial port to the desired blocking mode if necessary.
|
---|
684 | *
|
---|
685 | * @returns IPRT status code.
|
---|
686 | * @param pThis The internal serial port instance data.
|
---|
687 | * @param fBlocking The desired mode of operation.
|
---|
688 | */
|
---|
689 | DECLINLINE(int) rtSerialPortSwitchBlockingMode(PRTSERIALPORTINTERNAL pThis, bool fBlocking)
|
---|
690 | {
|
---|
691 | if (pThis->fBlocking != fBlocking)
|
---|
692 | return rtSerialPortSwitchBlockingModeSlow(pThis, fBlocking);
|
---|
693 | return VINF_SUCCESS;
|
---|
694 | }
|
---|
695 |
|
---|
696 |
|
---|
697 | RTDECL(int) RTSerialPortOpen(PRTSERIALPORT phSerialPort, const char *pszPortAddress, uint32_t fFlags)
|
---|
698 | {
|
---|
699 | AssertPtrReturn(phSerialPort, VERR_INVALID_POINTER);
|
---|
700 | AssertReturn(VALID_PTR(pszPortAddress) && *pszPortAddress != '\0', VERR_INVALID_PARAMETER);
|
---|
701 | AssertReturn(!(fFlags & ~RTSERIALPORT_OPEN_F_VALID_MASK), VERR_INVALID_PARAMETER);
|
---|
702 | AssertReturn((fFlags & RTSERIALPORT_OPEN_F_READ) || (fFlags & RTSERIALPORT_OPEN_F_WRITE),
|
---|
703 | VERR_INVALID_PARAMETER);
|
---|
704 |
|
---|
705 | int rc = VINF_SUCCESS;
|
---|
706 | PRTSERIALPORTINTERNAL pThis = (PRTSERIALPORTINTERNAL)RTMemAllocZ(sizeof(*pThis));
|
---|
707 | if (pThis)
|
---|
708 | {
|
---|
709 | int fPsxFlags = O_NOCTTY | O_NONBLOCK;
|
---|
710 |
|
---|
711 | if ((fFlags & RTSERIALPORT_OPEN_F_READ) && !(fFlags & RTSERIALPORT_OPEN_F_WRITE))
|
---|
712 | fPsxFlags |= O_RDONLY;
|
---|
713 | else if (!(fFlags & RTSERIALPORT_OPEN_F_READ) && (fFlags & RTSERIALPORT_OPEN_F_WRITE))
|
---|
714 | fPsxFlags |= O_WRONLY;
|
---|
715 | else
|
---|
716 | fPsxFlags |= O_RDWR;
|
---|
717 |
|
---|
718 | pThis->u32Magic = RTSERIALPORT_MAGIC;
|
---|
719 | pThis->fOpenFlags = fFlags;
|
---|
720 | pThis->fEvtsPending = 0;
|
---|
721 | pThis->iFd = open(pszPortAddress, fPsxFlags);
|
---|
722 | pThis->fBlocking = false;
|
---|
723 | if (pThis->iFd != -1)
|
---|
724 | {
|
---|
725 | /* Create wakeup pipe for the event API. */
|
---|
726 | int aPipeFds[2];
|
---|
727 | int rcPsx = pipe(&aPipeFds[0]);
|
---|
728 | if (!rcPsx)
|
---|
729 | {
|
---|
730 | /* Make the pipes close on exec. */
|
---|
731 | pThis->iFdPipeR = aPipeFds[0];
|
---|
732 | pThis->iFdPipeW = aPipeFds[1];
|
---|
733 |
|
---|
734 | if (fcntl(pThis->iFdPipeR, F_SETFD, FD_CLOEXEC))
|
---|
735 | rc = RTErrConvertFromErrno(errno);
|
---|
736 |
|
---|
737 | if ( RT_SUCCESS(rc)
|
---|
738 | && fcntl(pThis->iFdPipeW, F_SETFD, FD_CLOEXEC))
|
---|
739 | rc = RTErrConvertFromErrno(errno);
|
---|
740 |
|
---|
741 | if (RT_SUCCESS(rc))
|
---|
742 | {
|
---|
743 | rc = rtSerialPortSetDefaultCfg(pThis);
|
---|
744 | if ( RT_SUCCESS(rc)
|
---|
745 | && (fFlags & RTSERIALPORT_OPEN_F_SUPPORT_STATUS_LINE_MONITORING))
|
---|
746 | rc = rtSerialPortMonitorThreadCreate(pThis);
|
---|
747 |
|
---|
748 | if (RT_SUCCESS(rc))
|
---|
749 | {
|
---|
750 | *phSerialPort = pThis;
|
---|
751 | return VINF_SUCCESS;
|
---|
752 | }
|
---|
753 | }
|
---|
754 |
|
---|
755 | close(pThis->iFdPipeR);
|
---|
756 | close(pThis->iFdPipeW);
|
---|
757 | }
|
---|
758 | else
|
---|
759 | rc = RTErrConvertFromErrno(errno);
|
---|
760 |
|
---|
761 | close(pThis->iFd);
|
---|
762 | }
|
---|
763 | else
|
---|
764 | rc = RTErrConvertFromErrno(errno);
|
---|
765 |
|
---|
766 | RTMemFree(pThis);
|
---|
767 | }
|
---|
768 | else
|
---|
769 | rc = VERR_NO_MEMORY;
|
---|
770 |
|
---|
771 | return rc;
|
---|
772 | }
|
---|
773 |
|
---|
774 |
|
---|
775 | RTDECL(int) RTSerialPortClose(RTSERIALPORT hSerialPort)
|
---|
776 | {
|
---|
777 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
778 | if (pThis == NIL_RTSERIALPORT)
|
---|
779 | return VINF_SUCCESS;
|
---|
780 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
781 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
782 |
|
---|
783 | /*
|
---|
784 | * Do the cleanup.
|
---|
785 | */
|
---|
786 | AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, RTSERIALPORT_MAGIC_DEAD, RTSERIALPORT_MAGIC), VERR_INVALID_HANDLE);
|
---|
787 |
|
---|
788 | if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_SUPPORT_STATUS_LINE_MONITORING)
|
---|
789 | rtSerialPortMonitorThreadShutdown(pThis);
|
---|
790 |
|
---|
791 | close(pThis->iFd);
|
---|
792 | close(pThis->iFdPipeR);
|
---|
793 | close(pThis->iFdPipeW);
|
---|
794 | RTMemFree(pThis);
|
---|
795 | return VINF_SUCCESS;
|
---|
796 | }
|
---|
797 |
|
---|
798 |
|
---|
799 | RTDECL(RTHCINTPTR) RTSerialPortToNative(RTSERIALPORT hSerialPort)
|
---|
800 | {
|
---|
801 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
802 | AssertPtrReturn(pThis, -1);
|
---|
803 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, -1);
|
---|
804 |
|
---|
805 | return pThis->iFd;
|
---|
806 | }
|
---|
807 |
|
---|
808 |
|
---|
809 | RTDECL(int) RTSerialPortRead(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead)
|
---|
810 | {
|
---|
811 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
812 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
813 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
814 | AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
|
---|
815 | AssertReturn(cbToRead > 0, VERR_INVALID_PARAMETER);
|
---|
816 |
|
---|
817 | int rc = rtSerialPortSwitchBlockingMode(pThis, true);
|
---|
818 | if (RT_SUCCESS(rc))
|
---|
819 | {
|
---|
820 | /*
|
---|
821 | * Attempt read.
|
---|
822 | */
|
---|
823 | ssize_t cbRead = read(pThis->iFd, pvBuf, cbToRead);
|
---|
824 | if (cbRead >= 0)
|
---|
825 | {
|
---|
826 | if (pcbRead)
|
---|
827 | /* caller can handle partial read. */
|
---|
828 | *pcbRead = cbRead;
|
---|
829 | else
|
---|
830 | {
|
---|
831 | /* Caller expects all to be read. */
|
---|
832 | while ((ssize_t)cbToRead > cbRead)
|
---|
833 | {
|
---|
834 | ssize_t cbReadPart = read(pThis->iFd, (uint8_t *)pvBuf + cbRead, cbToRead - cbRead);
|
---|
835 | if (cbReadPart < 0)
|
---|
836 | return RTErrConvertFromErrno(errno);
|
---|
837 |
|
---|
838 | cbRead += cbReadPart;
|
---|
839 | }
|
---|
840 | }
|
---|
841 | }
|
---|
842 | else
|
---|
843 | rc = RTErrConvertFromErrno(errno);
|
---|
844 | }
|
---|
845 |
|
---|
846 | return rc;
|
---|
847 | }
|
---|
848 |
|
---|
849 |
|
---|
850 | RTDECL(int) RTSerialPortReadNB(RTSERIALPORT hSerialPort, void *pvBuf, size_t cbToRead, size_t *pcbRead)
|
---|
851 | {
|
---|
852 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
853 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
854 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
855 | AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
|
---|
856 | AssertReturn(cbToRead > 0, VERR_INVALID_PARAMETER);
|
---|
857 | AssertPtrReturn(pcbRead, VERR_INVALID_POINTER);
|
---|
858 |
|
---|
859 | *pcbRead = 0;
|
---|
860 |
|
---|
861 | int rc = rtSerialPortSwitchBlockingMode(pThis, false);
|
---|
862 | if (RT_SUCCESS(rc))
|
---|
863 | {
|
---|
864 | ssize_t cbThisRead = read(pThis->iFd, pvBuf, cbToRead);
|
---|
865 | if (cbThisRead > 0)
|
---|
866 | {
|
---|
867 | /*
|
---|
868 | * The read data needs to be scanned for the BREAK condition marker encoded in the data stream,
|
---|
869 | * if break detection was enabled during open.
|
---|
870 | */
|
---|
871 | if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_DETECT_BREAK_CONDITION)
|
---|
872 | { /** @todo */ }
|
---|
873 |
|
---|
874 | *pcbRead = cbThisRead;
|
---|
875 | }
|
---|
876 | else if (cbThisRead == 0 || errno == EAGAIN || errno == EWOULDBLOCK)
|
---|
877 | rc = VINF_TRY_AGAIN;
|
---|
878 | else
|
---|
879 | rc = RTErrConvertFromErrno(errno);
|
---|
880 | }
|
---|
881 |
|
---|
882 | return rc;
|
---|
883 | }
|
---|
884 |
|
---|
885 |
|
---|
886 | RTDECL(int) RTSerialPortWrite(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
|
---|
887 | {
|
---|
888 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
889 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
890 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
891 | AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
|
---|
892 | AssertReturn(cbToWrite > 0, VERR_INVALID_PARAMETER);
|
---|
893 |
|
---|
894 | int rc = rtSerialPortSwitchBlockingMode(pThis, true);
|
---|
895 | if (RT_SUCCESS(rc))
|
---|
896 | {
|
---|
897 | /*
|
---|
898 | * Attempt write.
|
---|
899 | */
|
---|
900 | ssize_t cbWritten = write(pThis->iFd, pvBuf, cbToWrite);
|
---|
901 | if (cbWritten >= 0)
|
---|
902 | {
|
---|
903 | if (pcbWritten)
|
---|
904 | /* caller can handle partial write. */
|
---|
905 | *pcbWritten = cbWritten;
|
---|
906 | else
|
---|
907 | {
|
---|
908 | /* Caller expects all to be written. */
|
---|
909 | while ((ssize_t)cbToWrite > cbWritten)
|
---|
910 | {
|
---|
911 | ssize_t cbWrittenPart = write(pThis->iFd, (const uint8_t *)pvBuf + cbWritten, cbToWrite - cbWritten);
|
---|
912 | if (cbWrittenPart < 0)
|
---|
913 | return RTErrConvertFromErrno(errno);
|
---|
914 | cbWritten += cbWrittenPart;
|
---|
915 | }
|
---|
916 | }
|
---|
917 | }
|
---|
918 | }
|
---|
919 |
|
---|
920 | return rc;
|
---|
921 | }
|
---|
922 |
|
---|
923 |
|
---|
924 | RTDECL(int) RTSerialPortWriteNB(RTSERIALPORT hSerialPort, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
|
---|
925 | {
|
---|
926 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
927 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
928 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
929 | AssertPtrReturn(pvBuf, VERR_INVALID_POINTER);
|
---|
930 | AssertReturn(cbToWrite > 0, VERR_INVALID_PARAMETER);
|
---|
931 | AssertPtrReturn(pcbWritten, VERR_INVALID_POINTER);
|
---|
932 |
|
---|
933 | *pcbWritten = 0;
|
---|
934 |
|
---|
935 | int rc = rtSerialPortSwitchBlockingMode(pThis, false);
|
---|
936 | if (RT_SUCCESS(rc))
|
---|
937 | {
|
---|
938 | ssize_t cbThisWrite = write(pThis->iFd, pvBuf, cbToWrite);
|
---|
939 | if (cbThisWrite > 0)
|
---|
940 | *pcbWritten = cbThisWrite;
|
---|
941 | else if (cbThisWrite == 0 || errno == EAGAIN || errno == EWOULDBLOCK)
|
---|
942 | rc = VINF_TRY_AGAIN;
|
---|
943 | else
|
---|
944 | rc = RTErrConvertFromErrno(errno);
|
---|
945 | }
|
---|
946 |
|
---|
947 | return rc;
|
---|
948 | }
|
---|
949 |
|
---|
950 |
|
---|
951 | RTDECL(int) RTSerialPortCfgQueryCurrent(RTSERIALPORT hSerialPort, PRTSERIALPORTCFG pCfg)
|
---|
952 | {
|
---|
953 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
954 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
955 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
956 |
|
---|
957 | return rtSerialPortTermios2Cfg(pThis, &pThis->PortCfg, pCfg);
|
---|
958 | }
|
---|
959 |
|
---|
960 |
|
---|
961 | RTDECL(int) RTSerialPortCfgSet(RTSERIALPORT hSerialPort, PCRTSERIALPORTCFG pCfg, PRTERRINFO pErrInfo)
|
---|
962 | {
|
---|
963 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
964 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
965 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
966 |
|
---|
967 | struct termios PortCfgNew; RT_ZERO(PortCfgNew);
|
---|
968 | bool fBaudrateCust = false;
|
---|
969 | int rc = rtSerialPortCfg2Termios(pThis, pCfg, &PortCfgNew, &fBaudrateCust, pErrInfo);
|
---|
970 | if (RT_SUCCESS(rc))
|
---|
971 | {
|
---|
972 | int rcPsx = tcflush(pThis->iFd, TCIOFLUSH);
|
---|
973 | if (!rcPsx)
|
---|
974 | {
|
---|
975 | #ifdef RT_OS_LINUX
|
---|
976 | if (fBaudrateCust)
|
---|
977 | {
|
---|
978 | struct serial_struct SerLnx;
|
---|
979 | rcPsx = ioctl(pThis->iFd, TIOCGSERIAL, &SerLnx);
|
---|
980 | if (!rcPsx)
|
---|
981 | {
|
---|
982 | SerLnx.custom_divisor = SerLnx.baud_base / pCfg->uBaudRate;
|
---|
983 | if (!SerLnx.custom_divisor)
|
---|
984 | SerLnx.custom_divisor = 1;
|
---|
985 | SerLnx.flags &= ~ASYNC_SPD_MASK;
|
---|
986 | SerLnx.flags |= ASYNC_SPD_CUST;
|
---|
987 | rcPsx = ioctl(pThis->iFd, TIOCSSERIAL, &SerLnx);
|
---|
988 | }
|
---|
989 | }
|
---|
990 | #else /* !RT_OS_LINUX */
|
---|
991 | /* Hosts not supporting custom baud rates should already fail in rtSerialPortCfg2Termios(). */
|
---|
992 | AssertMsgFailed(("Should not get here!\n"));
|
---|
993 | #endif /* !RT_OS_LINUX */
|
---|
994 | pThis->fBaudrateCust = fBaudrateCust;
|
---|
995 | pThis->uBaudRateCust = pCfg->uBaudRate;
|
---|
996 |
|
---|
997 | if (!rcPsx)
|
---|
998 | rcPsx = tcsetattr(pThis->iFd, TCSANOW, &PortCfgNew);
|
---|
999 | if (rcPsx == -1)
|
---|
1000 | rc = RTErrConvertFromErrno(errno);
|
---|
1001 | else
|
---|
1002 | memcpy(&pThis->PortCfg, &PortCfgNew, sizeof(struct termios));
|
---|
1003 |
|
---|
1004 | #ifdef RT_OS_LINUX
|
---|
1005 | /*
|
---|
1006 | * XXX In Linux, if a thread calls tcsetattr while the monitor thread is
|
---|
1007 | * waiting in ioctl for a modem status change then 8250.c wrongly disables
|
---|
1008 | * modem irqs and so the monitor thread never gets released. The workaround
|
---|
1009 | * is to send a signal after each tcsetattr.
|
---|
1010 | */
|
---|
1011 | if (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_SUPPORT_STATUS_LINE_MONITORING)
|
---|
1012 | RTThreadPoke(pThis->hMonThrd);
|
---|
1013 | #endif
|
---|
1014 | }
|
---|
1015 | else
|
---|
1016 | rc = RTErrConvertFromErrno(errno);
|
---|
1017 | }
|
---|
1018 |
|
---|
1019 | return rc;
|
---|
1020 | }
|
---|
1021 |
|
---|
1022 |
|
---|
1023 | RTDECL(int) RTSerialPortEvtPoll(RTSERIALPORT hSerialPort, uint32_t fEvtMask, uint32_t *pfEvtsRecv,
|
---|
1024 | RTMSINTERVAL msTimeout)
|
---|
1025 | {
|
---|
1026 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
1027 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
1028 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
1029 | AssertReturn(!(fEvtMask & ~RTSERIALPORT_EVT_F_VALID_MASK), VERR_INVALID_PARAMETER);
|
---|
1030 | AssertPtrReturn(pfEvtsRecv, VERR_INVALID_POINTER);
|
---|
1031 |
|
---|
1032 | *pfEvtsRecv = 0;
|
---|
1033 |
|
---|
1034 | fEvtMask |= RTSERIALPORT_EVT_F_STATUS_LINE_MONITOR_FAILED; /* This will be reported always, no matter what the caller wants. */
|
---|
1035 |
|
---|
1036 | /* Return early if there are events pending from previous calls which weren't fetched yet. */
|
---|
1037 | for (;;)
|
---|
1038 | {
|
---|
1039 | uint32_t fEvtsPending = ASMAtomicReadU32(&pThis->fEvtsPending);
|
---|
1040 | if (fEvtsPending & fEvtMask)
|
---|
1041 | {
|
---|
1042 | *pfEvtsRecv = fEvtsPending & fEvtMask;
|
---|
1043 | /* Write back, repeat the whole procedure if someone else raced us. */
|
---|
1044 | if (ASMAtomicCmpXchgU32(&pThis->fEvtsPending, fEvtsPending & ~fEvtMask, fEvtsPending))
|
---|
1045 | return VINF_SUCCESS;
|
---|
1046 | }
|
---|
1047 | else
|
---|
1048 | break;
|
---|
1049 | }
|
---|
1050 |
|
---|
1051 | int rc = rtSerialPortSwitchBlockingMode(pThis, false);
|
---|
1052 | if (RT_SUCCESS(rc))
|
---|
1053 | {
|
---|
1054 | struct pollfd aPollFds[2]; RT_ZERO(aPollFds);
|
---|
1055 | aPollFds[0].fd = pThis->iFd;
|
---|
1056 | aPollFds[0].events = POLLERR | POLLHUP;
|
---|
1057 | aPollFds[0].revents = 0;
|
---|
1058 | if ( (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_READ)
|
---|
1059 | && (fEvtMask & RTSERIALPORT_EVT_F_DATA_RX))
|
---|
1060 | aPollFds[0].events |= POLLIN;
|
---|
1061 | if ( (pThis->fOpenFlags & RTSERIALPORT_OPEN_F_WRITE)
|
---|
1062 | && (fEvtMask & RTSERIALPORT_EVT_F_DATA_TX))
|
---|
1063 | aPollFds[0].events |= POLLOUT;
|
---|
1064 |
|
---|
1065 | aPollFds[1].fd = pThis->iFdPipeR;
|
---|
1066 | aPollFds[1].events = POLLIN | POLLERR | POLLHUP;
|
---|
1067 | aPollFds[1].revents = 0;
|
---|
1068 |
|
---|
1069 | int rcPsx = 0;
|
---|
1070 | int msTimeoutLeft = msTimeout == RT_INDEFINITE_WAIT ? -1 : msTimeout;
|
---|
1071 | while (msTimeoutLeft != 0)
|
---|
1072 | {
|
---|
1073 | uint64_t tsPollStart = RTTimeMilliTS();
|
---|
1074 |
|
---|
1075 | rcPsx = poll(&aPollFds[0], RT_ELEMENTS(aPollFds), msTimeoutLeft);
|
---|
1076 | if (rcPsx != -1 || errno != EINTR)
|
---|
1077 | break;
|
---|
1078 | /* Restart when getting interrupted. */
|
---|
1079 | if (msTimeoutLeft > -1)
|
---|
1080 | {
|
---|
1081 | uint64_t tsPollEnd = RTTimeMilliTS();
|
---|
1082 | uint64_t tsPollSpan = tsPollEnd - tsPollStart;
|
---|
1083 | msTimeoutLeft -= RT_MIN(tsPollSpan, (uint32_t)msTimeoutLeft);
|
---|
1084 | }
|
---|
1085 | }
|
---|
1086 |
|
---|
1087 | uint32_t fEvtsPending = 0;
|
---|
1088 | if (rcPsx < 0 && errno != EINTR)
|
---|
1089 | rc = RTErrConvertFromErrno(errno);
|
---|
1090 | else if (rcPsx > 0)
|
---|
1091 | {
|
---|
1092 | if (aPollFds[0].revents != 0)
|
---|
1093 | {
|
---|
1094 | fEvtsPending |= (aPollFds[0].revents & POLLIN) ? RTSERIALPORT_EVT_F_DATA_RX : 0;
|
---|
1095 | fEvtsPending |= (aPollFds[0].revents & POLLOUT) ? RTSERIALPORT_EVT_F_DATA_TX : 0;
|
---|
1096 | /** @todo BREAK condition detection. */
|
---|
1097 | }
|
---|
1098 |
|
---|
1099 | if (aPollFds[1].revents != 0)
|
---|
1100 | {
|
---|
1101 | AssertReturn(!(aPollFds[1].revents & (POLLHUP | POLLERR | POLLNVAL)), VERR_INTERNAL_ERROR);
|
---|
1102 | Assert(aPollFds[1].revents & POLLIN);
|
---|
1103 |
|
---|
1104 | uint8_t bWakeupReason = 0;
|
---|
1105 | ssize_t cbRead = read(pThis->iFdPipeR, &bWakeupReason, 1);
|
---|
1106 | if (cbRead == 1)
|
---|
1107 | {
|
---|
1108 | switch (bWakeupReason)
|
---|
1109 | {
|
---|
1110 | case RTSERIALPORT_WAKEUP_PIPE_REASON_INTERRUPT:
|
---|
1111 | rc = VERR_INTERRUPTED;
|
---|
1112 | break;
|
---|
1113 | case RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_CHANGED:
|
---|
1114 | fEvtsPending |= RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED;
|
---|
1115 | break;
|
---|
1116 | case RTSERIALPORT_WAKEUP_PIPE_REASON_STS_LINE_MONITOR_FAILED:
|
---|
1117 | fEvtsPending |= RTSERIALPORT_EVT_F_STATUS_LINE_MONITOR_FAILED;
|
---|
1118 | break;
|
---|
1119 | default:
|
---|
1120 | AssertFailed();
|
---|
1121 | rc = VERR_INTERNAL_ERROR;
|
---|
1122 | }
|
---|
1123 | }
|
---|
1124 | else
|
---|
1125 | rc = VERR_INTERNAL_ERROR;
|
---|
1126 | }
|
---|
1127 | }
|
---|
1128 | else
|
---|
1129 | rc = VERR_TIMEOUT;
|
---|
1130 |
|
---|
1131 | *pfEvtsRecv = fEvtsPending & fEvtMask;
|
---|
1132 | fEvtsPending &= ~fEvtMask;
|
---|
1133 | ASMAtomicOrU32(&pThis->fEvtsPending, fEvtsPending);
|
---|
1134 | }
|
---|
1135 |
|
---|
1136 | return rc;
|
---|
1137 | }
|
---|
1138 |
|
---|
1139 |
|
---|
1140 | RTDECL(int) RTSerialPortEvtPollInterrupt(RTSERIALPORT hSerialPort)
|
---|
1141 | {
|
---|
1142 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
1143 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
1144 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
1145 |
|
---|
1146 | return rtSerialPortWakeupEvtPoller(pThis, RTSERIALPORT_WAKEUP_PIPE_REASON_INTERRUPT);
|
---|
1147 | }
|
---|
1148 |
|
---|
1149 |
|
---|
1150 | RTDECL(int) RTSerialPortChgBreakCondition(RTSERIALPORT hSerialPort, bool fSet)
|
---|
1151 | {
|
---|
1152 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
1153 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
1154 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
1155 |
|
---|
1156 | int rc = VINF_SUCCESS;
|
---|
1157 | int rcPsx = ioctl(pThis->iFd, fSet ? TIOCSBRK : TIOCCBRK);
|
---|
1158 | if (rcPsx == -1)
|
---|
1159 | rc = RTErrConvertFromErrno(errno);
|
---|
1160 |
|
---|
1161 | return rc;
|
---|
1162 | }
|
---|
1163 |
|
---|
1164 |
|
---|
1165 | RTDECL(int) RTSerialPortChgStatusLines(RTSERIALPORT hSerialPort, uint32_t fClear, uint32_t fSet)
|
---|
1166 | {
|
---|
1167 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
1168 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
1169 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
1170 |
|
---|
1171 | int rc = VINF_SUCCESS;
|
---|
1172 | int fTiocmSet = 0;
|
---|
1173 | int fTiocmClear = 0;
|
---|
1174 |
|
---|
1175 | if (fClear & RTSERIALPORT_CHG_STS_LINES_F_RTS)
|
---|
1176 | fTiocmClear |= TIOCM_RTS;
|
---|
1177 | if (fClear & RTSERIALPORT_CHG_STS_LINES_F_DTR)
|
---|
1178 | fTiocmClear |= TIOCM_DTR;
|
---|
1179 |
|
---|
1180 | if (fSet & RTSERIALPORT_CHG_STS_LINES_F_RTS)
|
---|
1181 | fTiocmSet |= TIOCM_RTS;
|
---|
1182 | if (fSet & RTSERIALPORT_CHG_STS_LINES_F_DTR)
|
---|
1183 | fTiocmSet |= TIOCM_DTR;
|
---|
1184 |
|
---|
1185 | int rcPsx = ioctl(pThis->iFd, TIOCMBIS, &fTiocmSet);
|
---|
1186 | if (!rcPsx)
|
---|
1187 | {
|
---|
1188 | rcPsx = ioctl(pThis->iFd, TIOCMBIC, &fTiocmClear);
|
---|
1189 | if (rcPsx == -1)
|
---|
1190 | rc = RTErrConvertFromErrno(errno);
|
---|
1191 | }
|
---|
1192 | return rc;
|
---|
1193 | }
|
---|
1194 |
|
---|
1195 |
|
---|
1196 | RTDECL(int) RTSerialPortQueryStatusLines(RTSERIALPORT hSerialPort, uint32_t *pfStsLines)
|
---|
1197 | {
|
---|
1198 | PRTSERIALPORTINTERNAL pThis = hSerialPort;
|
---|
1199 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
|
---|
1200 | AssertReturn(pThis->u32Magic == RTSERIALPORT_MAGIC, VERR_INVALID_HANDLE);
|
---|
1201 | AssertPtrReturn(pfStsLines, VERR_INVALID_POINTER);
|
---|
1202 |
|
---|
1203 | *pfStsLines = 0;
|
---|
1204 |
|
---|
1205 | int rc = VINF_SUCCESS;
|
---|
1206 | int fStsLines = 0;
|
---|
1207 | int rcPsx = ioctl(pThis->iFd, TIOCMGET, &fStsLines);
|
---|
1208 | if (!rcPsx)
|
---|
1209 | {
|
---|
1210 | /* This resets the status line event pending flag. */
|
---|
1211 | for (;;)
|
---|
1212 | {
|
---|
1213 | uint32_t fEvtsPending = ASMAtomicReadU32(&pThis->fEvtsPending);
|
---|
1214 | if (ASMAtomicCmpXchgU32(&pThis->fEvtsPending, fEvtsPending & ~RTSERIALPORT_EVT_F_STATUS_LINE_CHANGED, fEvtsPending))
|
---|
1215 | break;
|
---|
1216 | }
|
---|
1217 |
|
---|
1218 | *pfStsLines |= (fStsLines & TIOCM_CAR) ? RTSERIALPORT_STS_LINE_DCD : 0;
|
---|
1219 | *pfStsLines |= (fStsLines & TIOCM_RNG) ? RTSERIALPORT_STS_LINE_RI : 0;
|
---|
1220 | *pfStsLines |= (fStsLines & TIOCM_DSR) ? RTSERIALPORT_STS_LINE_DSR : 0;
|
---|
1221 | *pfStsLines |= (fStsLines & TIOCM_CTS) ? RTSERIALPORT_STS_LINE_CTS : 0;
|
---|
1222 | }
|
---|
1223 | else
|
---|
1224 | rc = RTErrConvertFromErrno(errno);
|
---|
1225 |
|
---|
1226 | return rc;
|
---|
1227 | }
|
---|
1228 |
|
---|