1 | |
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2 | #include <fcntl.h> |
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3 | #include <stdio.h> |
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4 | #include <stdlib.h> |
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5 | #include <string.h> |
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6 | #include <termios.h> |
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7 | #include <unistd.h> |
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8 | |
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9 | #include <sys/ioctl.h> |
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10 | |
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11 | #include <linux/serial.h> |
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12 | #include <linux/serial_core.h> |
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13 | |
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14 | struct speeds |
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15 | { |
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16 | speed_t speed; |
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17 | unsigned long value; |
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18 | }; |
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19 | |
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20 | struct speeds speed_map[] = |
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21 | { |
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22 | {B50, 50}, |
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23 | {B75, 75}, |
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24 | {B110, 110}, |
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25 | {B134, 134}, |
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26 | {B150, 150}, |
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27 | {B200, 200}, |
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28 | {B300, 300}, |
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29 | {B600, 600}, |
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30 | {B1200, 1200}, |
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31 | {B1800, 1800}, |
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32 | {B2400, 2400}, |
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33 | {B4800, 4800}, |
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34 | {B9600, 9600}, |
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35 | {B19200, 19200}, |
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36 | {B38400, 38400}, |
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37 | #ifdef B57600 |
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38 | {B57600, 57600}, |
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39 | #endif |
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40 | #ifdef B115200 |
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41 | {B115200, 115200}, |
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42 | #endif |
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43 | #ifdef B230400 |
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44 | {B230400, 230400}, |
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45 | #endif |
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46 | #ifdef B460800 |
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47 | {B460800, 460800}, |
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48 | #endif |
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49 | {0, 0} |
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50 | }; |
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51 | |
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52 | int termcmp(struct termios *a, struct termios *b) { |
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53 | if (a->c_iflag != b->c_iflag || a->c_oflag != b->c_oflag || |
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54 | a->c_cflag != b->c_cflag || a->c_lflag != b->c_lflag || |
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55 | cfgetispeed(a) != cfgetispeed(b) || cfgetospeed(a) != cfgetospeed(b)) |
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56 | return 1; |
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57 | return memcmp(a->c_cc, b->c_cc, sizeof(a->c_cc)); |
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58 | } |
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59 | |
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60 | int get_serial_speed(int fd) { |
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61 | struct termios mode; |
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62 | |
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63 | if (!tcgetattr(fd, &mode)) { |
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64 | int i; |
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65 | speed_t speed; |
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66 | |
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67 | speed = cfgetospeed(&mode); |
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68 | for (i = 0; speed_map[i].value != 0; i++) |
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69 | if (speed_map[i].speed == speed) |
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70 | return speed_map[i].value; |
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71 | } |
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72 | return 0; |
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73 | } |
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74 | |
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75 | int compare_termios_to_console(char *dev, int *speed) { |
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76 | struct termios cmode, mode; |
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77 | int fd, cfd; |
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78 | |
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79 | cfd = open ("/dev/console", O_RDONLY); |
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80 | tcgetattr(cfd, &cmode); |
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81 | close(cfd); |
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82 | |
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83 | fd = open(dev, O_RDONLY|O_NONBLOCK); |
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84 | tcgetattr(fd, &mode); |
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85 | |
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86 | if (!termcmp(&cmode, &mode)) { |
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87 | *speed = get_serial_speed(fd); |
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88 | close(fd); |
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89 | return 1; |
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90 | } |
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91 | close(fd); |
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92 | return 0; |
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93 | } |
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94 | |
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95 | char *serial_tty_name(int type) { |
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96 | switch (type) { |
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97 | case PORT_8250...PORT_MAX_8250: |
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98 | return "ttyS"; |
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99 | case PORT_PMAC_ZILOG: |
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100 | return "ttyPZ"; |
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101 | case PORT_MPSC: |
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102 | return "ttyMM"; |
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103 | case PORT_CPM: |
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104 | return "ttyCPM"; |
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105 | case PORT_MPC52xx: |
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106 | return "ttyPSC"; |
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107 | default: |
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108 | return NULL; |
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109 | } |
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110 | } |
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111 | |
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112 | char *check_serial_console(int *speed) { |
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113 | int fd; |
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114 | char *ret = NULL, *device; |
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115 | char twelve = 12; |
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116 | struct serial_struct si, si2; |
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117 | char *tty_name; |
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118 | |
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119 | memset(&si, 0, sizeof(si)); |
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120 | memset(&si2, 0, sizeof(si)); |
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121 | |
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122 | fd = open("/dev/console", O_RDWR); |
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123 | if (ioctl (fd, TIOCLINUX, &twelve) >= 0) |
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124 | goto out; |
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125 | |
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126 | if (ioctl(fd, TIOCGSERIAL, &si) < 0) |
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127 | goto out; |
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128 | close(fd); |
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129 | |
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130 | tty_name = serial_tty_name(si.type); |
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131 | if (!tty_name) |
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132 | goto out; |
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133 | |
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134 | asprintf(&device, "%s%d", tty_name, si.line); |
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135 | fd = open(device, O_RDWR|O_NONBLOCK); |
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136 | if (fd == -1) |
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137 | goto out; |
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138 | |
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139 | if (ioctl(fd, TIOCGSERIAL, &si2) < 0) |
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140 | goto out; |
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141 | |
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142 | if (memcmp(&si,&si2, sizeof(si))) |
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143 | goto out; |
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144 | |
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145 | *speed = get_serial_speed(fd); |
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146 | ret = device; |
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147 | out: |
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148 | close(fd); |
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149 | return ret; |
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150 | } |
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151 | |
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152 | int emit_console_event(char *dev, int speed) { |
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153 | char *args[] = { "initctl", "emit", "--no-wait", "fedora.serial-console-available", NULL, NULL, NULL }; |
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154 | |
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155 | args[4] = dev; |
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156 | if (speed) |
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157 | asprintf(&args[5],"%d",speed); |
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158 | execv("/sbin/initctl", args); |
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159 | return 1; |
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160 | } |
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161 | |
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162 | int main(int argc, char **argv) { |
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163 | char *device; |
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164 | int speed; |
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165 | |
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166 | if (argc < 2) { |
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167 | printf("usage: console_check <device>\n"); |
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168 | exit(1); |
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169 | } |
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170 | chdir("/dev"); |
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171 | device = argv[1]; |
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172 | if (!strcmp(device, "console")) { |
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173 | device = check_serial_console(&speed); |
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174 | if (device) |
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175 | return emit_console_event(device, speed); |
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176 | } else if (compare_termios_to_console(device, &speed)) { |
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177 | return emit_console_event(device, speed); |
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178 | } |
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179 | return 0; |
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180 | } |
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