1 | /* |
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2 | * /dev/ptyXX (A first version for pseudo-terminals) |
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3 | * |
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4 | * Author: Fernando RUIZ CASAS (fernando.ruiz@ctv.es) |
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5 | * May 2001 |
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6 | * |
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7 | * This program is distributed in the hope that it will be useful, |
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8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #ifdef HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | /*-----------------------------------------*/ |
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19 | #include <termios.h> |
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20 | #include <rtems.h> |
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21 | #include <rtems/libio.h> |
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22 | #include <rtems/pty.h> |
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23 | #include <rtems/bspIo.h> |
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24 | /*-----------------------------------------*/ |
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25 | #include <stdio.h> |
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26 | #include <stdlib.h> |
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27 | #include <string.h> |
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28 | #include <unistd.h> |
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29 | /*-----------------------------------------*/ |
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30 | #define IAC_ESC 255 |
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31 | #define IAC_DONT 254 |
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32 | #define IAC_DO 253 |
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33 | #define IAC_WONT 252 |
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34 | #define IAC_WILL 251 |
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35 | #define IAC_SB 250 |
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36 | #define IAC_GA 249 |
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37 | #define IAC_EL 248 |
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38 | #define IAC_EC 247 |
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39 | #define IAC_AYT 246 |
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40 | #define IAC_AO 245 |
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41 | #define IAC_IP 244 |
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42 | #define IAC_BRK 243 |
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43 | #define IAC_DMARK 242 |
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44 | #define IAC_NOP 241 |
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45 | #define IAC_SE 240 |
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46 | #define IAC_EOR 239 |
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47 | |
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48 | struct pty_tt; |
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49 | typedef struct pty_tt pty_t; |
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50 | |
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51 | struct pty_tt { |
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52 | char *devname; |
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53 | struct rtems_termios_tty *ttyp; |
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54 | tcflag_t c_cflag; |
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55 | int opened; |
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56 | int socket; |
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57 | |
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58 | int last_cr; |
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59 | int iac_mode; |
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60 | }; |
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61 | |
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62 | |
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63 | int ptys_initted=FALSE; |
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64 | pty_t ptys[MAX_PTYS]; |
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65 | |
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66 | /* This procedure returns the devname for a pty slot free. |
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67 | * If not slot availiable (field socket>=0) |
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68 | * then the socket argument is closed |
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69 | */ |
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70 | |
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71 | char * get_pty(int socket) { |
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72 | int ndx; |
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73 | if (!ptys_initted) return NULL; |
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74 | for (ndx=0;ndx<MAX_PTYS;ndx++) { |
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75 | if (ptys[ndx].socket<0) { |
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76 | ptys[ndx].socket=socket; |
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77 | return ptys[ndx].devname; |
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78 | }; |
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79 | }; |
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80 | close(socket); |
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81 | return NULL; |
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82 | } |
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83 | |
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84 | |
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85 | /*-----------------------------------------------------------*/ |
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86 | /* |
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87 | * The NVT terminal is negociated in PollRead and PollWrite |
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88 | * with every BYTE sendded or received. |
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89 | * A litle status machine in the pty_read_byte(int minor) |
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90 | * |
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91 | */ |
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92 | const char IAC_AYT_RSP[]="\r\nAYT? Yes, RTEMS-SHELL is here\r\n"; |
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93 | const char IAC_BRK_RSP[]="<*Break*>"; |
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94 | const char IAC_IP_RSP []="<*Interrupt*>"; |
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95 | |
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96 | |
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97 | static |
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98 | int send_iac(int minor,unsigned char mode,unsigned char option) { |
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99 | unsigned char buf[3]; |
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100 | buf[0]=IAC_ESC; |
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101 | buf[1]=mode; |
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102 | buf[2]=option; |
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103 | return write(ptys[minor].socket,buf,sizeof(buf)); |
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104 | } |
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105 | |
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106 | int read_pty(int minor) { /* Characters writed in the client side*/ |
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107 | unsigned char value; |
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108 | int count; |
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109 | int result; |
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110 | count=read(ptys[minor].socket,&value,sizeof(value)); |
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111 | if (count<1) { |
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112 | fclose(stdin); |
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113 | fclose(stdout); |
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114 | fclose(stderr); |
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115 | /* If you don't read from the socket the system ends the task */ |
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116 | rtems_task_delete(RTEMS_SELF); |
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117 | }; |
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118 | switch(ptys[minor].iac_mode) { |
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119 | case IAC_ESC: |
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120 | ptys[minor].iac_mode=0; |
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121 | switch(value) { |
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122 | case IAC_ESC : |
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123 | return IAC_ESC; |
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124 | case IAC_DONT: |
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125 | case IAC_DO : |
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126 | case IAC_WONT: |
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127 | case IAC_WILL: |
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128 | ptys[minor].iac_mode=value; |
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129 | return -1; |
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130 | case IAC_SB : |
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131 | return -100; |
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132 | case IAC_GA : |
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133 | return -1; |
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134 | case IAC_EL : |
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135 | return 0x03; /* Ctrl-C*/ |
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136 | case IAC_EC : |
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137 | return '\b'; |
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138 | case IAC_AYT : |
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139 | write(ptys[minor].socket,IAC_AYT_RSP,strlen(IAC_AYT_RSP)); |
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140 | return -1; |
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141 | case IAC_AO : |
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142 | return -1; |
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143 | case IAC_IP : |
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144 | write(ptys[minor].socket,IAC_IP_RSP,strlen(IAC_IP_RSP)); |
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145 | return -1; |
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146 | case IAC_BRK : |
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147 | write(ptys[minor].socket,IAC_BRK_RSP,strlen(IAC_BRK_RSP)); |
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148 | return -1; |
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149 | case IAC_DMARK: |
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150 | return -2; |
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151 | case IAC_NOP : |
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152 | return -1; |
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153 | case IAC_SE : |
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154 | return -101; |
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155 | case IAC_EOR : |
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156 | return -102; |
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157 | default : |
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158 | return -1; |
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159 | }; |
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160 | break; |
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161 | case IAC_WILL: |
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162 | ptys[minor].iac_mode=0; |
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163 | if (value==34){send_iac(minor,IAC_DONT, 34); /*LINEMODE*/ |
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164 | send_iac(minor,IAC_DO , 1);} else /*ECHO */ |
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165 | {send_iac(minor,IAC_DONT,value);}; |
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166 | return -1; |
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167 | case IAC_DONT: |
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168 | ptys[minor].iac_mode=0; |
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169 | return -1; |
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170 | case IAC_DO : |
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171 | ptys[minor].iac_mode=0; |
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172 | if (value==3) {send_iac(minor,IAC_WILL, 3);} else /* GO AHEAD*/ |
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173 | if (value==1) { } else /* ECHO */ |
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174 | {send_iac(minor,IAC_WONT,value);}; |
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175 | return -1; |
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176 | case IAC_WONT: |
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177 | ptys[minor].iac_mode=0; |
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178 | if (value==1) {send_iac(minor,IAC_WILL, 1);} else /* ECHO */ |
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179 | {send_iac(minor,IAC_WONT,value);}; |
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180 | return -1; |
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181 | default: |
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182 | ptys[minor].iac_mode=0; |
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183 | if (value==IAC_ESC) { |
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184 | ptys[minor].iac_mode=value; |
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185 | return -1; |
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186 | } else { |
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187 | result=value; |
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188 | if ((value=='\n') && (ptys[minor].last_cr)) result=-1; |
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189 | ptys[minor].last_cr=(value=='\r'); |
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190 | return result; |
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191 | }; |
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192 | }; |
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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 | static int ptySetAttributes(int minor,const struct termios *t); |
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198 | static int ptyPollInitialize(int major,int minor,void * arg) ; |
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199 | static int ptyShutdown(int major,int minor,void * arg) ; |
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200 | static int ptyPollWrite(int minor, const char * buf,int len) ; |
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201 | static int ptyPollRead(int minor) ; |
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202 | const rtems_termios_callbacks * pty_get_termios_handlers(int polled) ; |
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203 | /*-----------------------------------------------------------*/ |
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204 | /* Set the 'Hardware' */ |
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205 | /*-----------------------------------------------------------*/ |
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206 | static int |
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207 | ptySetAttributes(int minor,const struct termios *t) { |
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208 | if (minor<MAX_PTYS) { |
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209 | ptys[minor].c_cflag=t->c_cflag; |
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210 | } else { |
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211 | return -1; |
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212 | }; |
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213 | return 0; |
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214 | } |
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215 | /*-----------------------------------------------------------*/ |
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216 | static int |
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217 | ptyPollInitialize(int major,int minor,void * arg) { |
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218 | rtems_libio_open_close_args_t * args = arg; |
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219 | struct termios t; |
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220 | if (minor<MAX_PTYS) { |
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221 | if (ptys[minor].socket<0) return -1; |
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222 | ptys[minor].opened=TRUE; |
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223 | ptys[minor].ttyp=args->iop->data1; |
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224 | t.c_cflag=B9600|CS8;/* termios default */ |
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225 | return ptySetAttributes(minor,&t); |
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226 | } else { |
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227 | return -1; |
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228 | }; |
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229 | } |
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230 | /*-----------------------------------------------------------*/ |
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231 | static int |
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232 | ptyShutdown(int major,int minor,void * arg) { |
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233 | if (minor<MAX_PTYS) { |
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234 | ptys[minor].opened=FALSE; |
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235 | if (ptys[minor].socket>=0) close(ptys[minor].socket); |
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236 | ptys[minor].socket=-1; |
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237 | chown(ptys[minor].devname,2,0); |
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238 | } else { |
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239 | return -1; |
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240 | }; |
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241 | return 0; |
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242 | } |
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243 | /*-----------------------------------------------------------*/ |
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244 | /* Write Characters into pty device */ |
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245 | /*-----------------------------------------------------------*/ |
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246 | static int |
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247 | ptyPollWrite(int minor, const char * buf,int len) { |
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248 | int count; |
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249 | if (minor<MAX_PTYS) { |
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250 | if (ptys[minor].socket<0) return -1; |
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251 | count=write(ptys[minor].socket,buf,len); |
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252 | } else { |
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253 | count=-1; |
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254 | }; |
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255 | return count; |
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256 | } |
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257 | /*-----------------------------------------------------------*/ |
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258 | static int |
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259 | ptyPollRead(int minor) { |
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260 | int result; |
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261 | if (minor<MAX_PTYS) { |
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262 | if (ptys[minor].socket<0) return -1; |
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263 | result=read_pty(minor); |
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264 | return result; |
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265 | }; |
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266 | return -1; |
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267 | } |
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268 | /*-----------------------------------------------------------*/ |
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269 | static const rtems_termios_callbacks pty_poll_callbacks = { |
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270 | ptyPollInitialize, /* FirstOpen*/ |
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271 | ptyShutdown, /* LastClose*/ |
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272 | ptyPollRead, /* PollRead */ |
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273 | ptyPollWrite, /* Write */ |
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274 | ptySetAttributes, /* setAttributes */ |
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275 | NULL, /* stopRemoteTX */ |
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276 | NULL, /* StartRemoteTX */ |
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277 | 0 /* outputUsesInterrupts */ |
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278 | }; |
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279 | /*-----------------------------------------------------------*/ |
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280 | const rtems_termios_callbacks * pty_get_termios_handlers(int polled) { |
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281 | return &pty_poll_callbacks; |
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282 | } |
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283 | /*-----------------------------------------------------------*/ |
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284 | void init_ptys(void) { |
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285 | int ndx; |
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286 | for (ndx=0;ndx<MAX_PTYS;ndx++) { |
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287 | ptys[ndx].devname=malloc(strlen("/dev/ptyXX")+1); |
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288 | sprintf(ptys[ndx].devname,"/dev/pty%X",ndx); |
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289 | ptys[ndx].ttyp=NULL; |
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290 | ptys[ndx].c_cflag=CS8|B9600; |
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291 | ptys[ndx].socket=-1; |
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292 | ptys[ndx].opened=FALSE; |
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293 | |
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294 | }; |
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295 | ptys_initted=TRUE; |
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296 | } |
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297 | |
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298 | |
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299 | /*-----------------------------------------------------------*/ |
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300 | /* pty_initialize |
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301 | * |
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302 | * This routine initializes the pty IO driver. |
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303 | * |
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304 | * Input parameters: NONE |
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305 | * |
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306 | * Output parameters: NONE |
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307 | * |
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308 | * Return values: |
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309 | */ |
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310 | /*-----------------------------------------------------------*/ |
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311 | rtems_device_driver pty_initialize( |
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312 | rtems_device_major_number major, |
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313 | rtems_device_minor_number minor, |
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314 | void *arg |
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315 | ) |
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316 | { |
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317 | int ndx; |
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318 | rtems_status_code status ; |
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319 | |
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320 | /* |
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321 | * Set up ptys |
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322 | */ |
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323 | |
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324 | init_ptys(); |
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325 | |
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326 | /* |
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327 | * Register the devices |
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328 | */ |
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329 | for (ndx=0;ndx<MAX_PTYS;ndx++) { |
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330 | status = rtems_io_register_name(ptys[ndx].devname, major, ndx); |
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331 | if (status != RTEMS_SUCCESSFUL) |
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332 | rtems_fatal_error_occurred(status); |
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333 | chmod(ptys[ndx].devname,0660); |
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334 | chown(ptys[ndx].devname,2,0); /* tty,root*/ |
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335 | }; |
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336 | printk("Device: /dev/pty%X../dev/pty%X (%d)pseudo-terminals registered.\n",0,MAX_PTYS-1,MAX_PTYS); |
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337 | |
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338 | return RTEMS_SUCCESSFUL; |
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339 | } |
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340 | |
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341 | |
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342 | /* |
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343 | * Open entry point |
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344 | */ |
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345 | |
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346 | rtems_device_driver pty_open( |
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347 | rtems_device_major_number major, |
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348 | rtems_device_minor_number minor, |
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349 | void * arg |
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350 | ) |
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351 | { |
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352 | rtems_status_code sc ; |
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353 | sc = rtems_termios_open(major,minor,arg,pty_get_termios_handlers(FALSE)); |
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354 | return sc; |
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355 | } |
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356 | |
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357 | /* |
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358 | * Close entry point |
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359 | */ |
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360 | |
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361 | rtems_device_driver pty_close( |
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362 | rtems_device_major_number major, |
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363 | rtems_device_minor_number minor, |
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364 | void * arg |
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365 | ) |
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366 | { |
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367 | return rtems_termios_close(arg); |
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368 | } |
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369 | |
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370 | /* |
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371 | * read bytes from the pty |
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372 | */ |
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373 | |
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374 | rtems_device_driver pty_read( |
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375 | rtems_device_major_number major, |
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376 | rtems_device_minor_number minor, |
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377 | void * arg |
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378 | ) |
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379 | { |
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380 | return rtems_termios_read(arg); |
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381 | } |
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382 | |
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383 | /* |
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384 | * write bytes to the pty |
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385 | */ |
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386 | |
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387 | rtems_device_driver pty_write( |
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388 | rtems_device_major_number major, |
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389 | rtems_device_minor_number minor, |
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390 | void * arg |
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391 | ) |
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392 | { |
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393 | return rtems_termios_write(arg); |
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394 | } |
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395 | |
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396 | /* |
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397 | * IO Control entry point |
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398 | */ |
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399 | |
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400 | rtems_device_driver pty_control( |
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401 | rtems_device_major_number major, |
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402 | rtems_device_minor_number minor, |
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403 | void * arg |
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404 | ) |
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405 | { |
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406 | return rtems_termios_ioctl(arg); |
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407 | } |
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