1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * simple ACPI events listener
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4 | *
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5 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | //usage:#define acpid_trivial_usage
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11 | //usage: "[-df] [-c CONFDIR] [-l LOGFILE] [-a ACTIONFILE] [-M MAPFILE] [-e PROC_EVENT_FILE] [-p PIDFILE]"
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12 | //usage:#define acpid_full_usage "\n\n"
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13 | //usage: "Listen to ACPI events and spawn specific helpers on event arrival\n"
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14 | //usage: "\n -d Log to stderr, not log file (implies -f)"
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15 | //usage: "\n -f Run in foreground"
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16 | //usage: "\n -c DIR Config directory [/etc/acpi]"
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17 | //usage: "\n -e FILE /proc event file [/proc/acpi/event]"
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18 | //usage: "\n -l FILE Log file [/var/log/acpid.log]"
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19 | //usage: "\n -p FILE Pid file [/var/run/acpid.pid]"
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20 | //usage: "\n -a FILE Action file [/etc/acpid.conf]"
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21 | //usage: "\n -M FILE Map file [/etc/acpi.map]"
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22 | //usage: IF_FEATURE_ACPID_COMPAT(
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23 | //usage: "\n\nAccept and ignore compatibility options -g -m -s -S -v"
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24 | //usage: )
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25 | //usage:
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26 | //usage:#define acpid_example_usage
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27 | //usage: "Without -e option, acpid uses all /dev/input/event* files\n"
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28 | //usage: "# acpid\n"
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29 | //usage: "# acpid -l /var/log/my-acpi-log\n"
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30 | //usage: "# acpid -e /proc/acpi/event\n"
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31 |
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32 | #include "libbb.h"
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33 | #include <syslog.h>
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34 | #include <linux/input.h>
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35 |
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36 | #ifndef EV_SW
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37 | # define EV_SW 0x05
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38 | #endif
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39 | #ifndef EV_KEY
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40 | # define EV_KEY 0x01
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41 | #endif
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42 | #ifndef SW_LID
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43 | # define SW_LID 0x00
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44 | #endif
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45 | #ifndef SW_RFKILL_ALL
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46 | # define SW_RFKILL_ALL 0x03
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47 | #endif
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48 | #ifndef KEY_POWER
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49 | # define KEY_POWER 116 /* SC System Power Down */
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50 | #endif
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51 | #ifndef KEY_SLEEP
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52 | # define KEY_SLEEP 142 /* SC System Sleep */
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53 | #endif
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54 |
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55 | enum {
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56 | OPT_c = (1 << 0),
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57 | OPT_d = (1 << 1),
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58 | OPT_e = (1 << 2),
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59 | OPT_f = (1 << 3),
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60 | OPT_l = (1 << 4),
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61 | OPT_a = (1 << 5),
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62 | OPT_M = (1 << 6),
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63 | OPT_p = (1 << 7) * ENABLE_FEATURE_PIDFILE,
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64 | };
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65 |
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66 | struct acpi_event {
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67 | const char *s_type;
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68 | uint16_t n_type;
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69 | const char *s_code;
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70 | uint16_t n_code;
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71 | uint32_t value;
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72 | const char *desc;
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73 | };
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74 |
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75 | static const struct acpi_event f_evt_tab[] = {
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76 | { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRF 00000080" },
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77 | { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRB 00000080" },
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78 | { "EV_SW", 0x05, "SW_LID", 0x00, 1, "button/lid LID0 00000080" },
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79 | };
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80 |
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81 | struct acpi_action {
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82 | const char *key;
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83 | const char *action;
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84 | };
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85 |
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86 | static const struct acpi_action f_act_tab[] = {
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87 | { "PWRF", "PWRF/00000080" },
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88 | { "LID0", "LID/00000080" },
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89 | };
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90 |
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91 | struct globals {
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92 | struct acpi_action *act_tab;
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93 | int n_act;
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94 | struct acpi_event *evt_tab;
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95 | int n_evt;
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96 | } FIX_ALIASING;
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97 | #define G (*ptr_to_globals)
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98 | #define act_tab (G.act_tab)
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99 | #define n_act (G.n_act )
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100 | #define evt_tab (G.evt_tab)
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101 | #define n_evt (G.n_evt )
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102 | #define INIT_G() do { \
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103 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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104 | } while (0)
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105 |
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106 | /*
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107 | * acpid listens to ACPI events coming either in textual form
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108 | * from /proc/acpi/event (though it is marked deprecated,
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109 | * it is still widely used and _is_ a standard) or in binary form
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110 | * from specified evdevs (just use /dev/input/event*).
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111 | * It parses the event to retrieve ACTION and a possible PARAMETER.
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112 | * It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
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113 | * (if the resulting path is a directory) or directly.
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114 | * If the resulting path does not exist it logs it via perror
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115 | * and continues listening.
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116 | */
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117 |
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118 | static void process_event(const char *event)
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119 | {
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120 | struct stat st;
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121 | char *handler = xasprintf("./%s", event);
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122 | const char *args[] = { "run-parts", handler, NULL };
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123 |
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124 | // debug info
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125 | if (option_mask32 & OPT_d) {
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126 | bb_error_msg("%s", event);
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127 | }
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128 |
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129 | // spawn handler
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130 | // N.B. run-parts would require scripts to have #!/bin/sh
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131 | // handler is directory? -> use run-parts
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132 | // handler is file? -> run it directly
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133 | if (0 == stat(event, &st))
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134 | spawn((char **)args + (0==(st.st_mode & S_IFDIR)));
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135 | else
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136 | bb_simple_perror_msg(event);
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137 |
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138 | free(handler);
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139 | }
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140 |
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141 | static const char *find_action(struct input_event *ev, const char *buf)
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142 | {
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143 | const char *action = NULL;
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144 | int i;
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145 |
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146 | // map event
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147 | for (i = 0; i < n_evt; i++) {
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148 | if (ev) {
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149 | if (ev->type == evt_tab[i].n_type && ev->code == evt_tab[i].n_code && ev->value == evt_tab[i].value) {
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150 | action = evt_tab[i].desc;
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151 | break;
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152 | }
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153 | }
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154 |
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155 | if (buf) {
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156 | if (strncmp(buf, evt_tab[i].desc, strlen(buf)) == 0) {
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157 | action = evt_tab[i].desc;
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158 | break;
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159 | }
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160 | }
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161 | }
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162 |
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163 | // get action
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164 | if (action) {
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165 | for (i = 0; i < n_act; i++) {
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166 | if (strstr(action, act_tab[i].key)) {
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167 | action = act_tab[i].action;
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168 | break;
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169 | }
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170 | }
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171 | }
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172 |
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173 | return action;
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174 | }
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175 |
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176 | static void parse_conf_file(const char *filename)
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177 | {
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178 | parser_t *parser;
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179 | char *tokens[2];
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180 |
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181 | parser = config_open2(filename, fopen_for_read);
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182 |
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183 | if (parser) {
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184 | while (config_read(parser, tokens, 2, 2, "# \t", PARSE_NORMAL)) {
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185 | act_tab = xrealloc_vector(act_tab, 1, n_act);
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186 | act_tab[n_act].key = xstrdup(tokens[0]);
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187 | act_tab[n_act].action = xstrdup(tokens[1]);
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188 | n_act++;
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189 | }
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190 | config_close(parser);
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191 | } else {
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192 | act_tab = (void*)f_act_tab;
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193 | n_act = ARRAY_SIZE(f_act_tab);
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194 | }
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195 | }
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196 |
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197 | static void parse_map_file(const char *filename)
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198 | {
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199 | parser_t *parser;
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200 | char *tokens[6];
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201 |
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202 | parser = config_open2(filename, fopen_for_read);
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203 |
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204 | if (parser) {
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205 | while (config_read(parser, tokens, 6, 6, "# \t", PARSE_NORMAL)) {
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206 | evt_tab = xrealloc_vector(evt_tab, 1, n_evt);
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207 | evt_tab[n_evt].s_type = xstrdup(tokens[0]);
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208 | evt_tab[n_evt].n_type = xstrtou(tokens[1], 16);
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209 | evt_tab[n_evt].s_code = xstrdup(tokens[2]);
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210 | evt_tab[n_evt].n_code = xatou16(tokens[3]);
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211 | evt_tab[n_evt].value = xatoi_positive(tokens[4]);
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212 | evt_tab[n_evt].desc = xstrdup(tokens[5]);
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213 | n_evt++;
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214 | }
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215 | config_close(parser);
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216 | } else {
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217 | evt_tab = (void*)f_evt_tab;
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218 | n_evt = ARRAY_SIZE(f_evt_tab);
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219 | }
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220 | }
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221 |
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222 | /*
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223 | * acpid [-c conf_dir] [-r conf_file ] [-a map_file ] [-l log_file] [-e proc_event_file]
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224 | */
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225 |
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226 | int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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227 | int acpid_main(int argc UNUSED_PARAM, char **argv)
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228 | {
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229 | int nfd;
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230 | int opts;
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231 | struct pollfd *pfd;
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232 | const char *opt_dir = "/etc/acpi";
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233 | const char *opt_input = "/dev/input/event";
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234 | const char *opt_logfile = "/var/log/acpid.log";
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235 | const char *opt_action = "/etc/acpid.conf";
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236 | const char *opt_map = "/etc/acpi.map";
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237 | #if ENABLE_FEATURE_PIDFILE
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238 | const char *opt_pidfile = CONFIG_PID_FILE_PATH "/acpid.pid";
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239 | #endif
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240 |
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241 | INIT_G();
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242 |
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243 | opt_complementary = "df:e--e";
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244 | opts = getopt32(argv, "c:de:fl:a:M:" IF_FEATURE_PIDFILE("p:") IF_FEATURE_ACPID_COMPAT("g:m:s:S:v"),
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245 | &opt_dir, &opt_input, &opt_logfile, &opt_action, &opt_map
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246 | IF_FEATURE_PIDFILE(, &opt_pidfile)
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247 | IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL)
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248 | );
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249 |
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250 | if (!(opts & OPT_f)) {
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251 | /* No -f "Foreground", we go to background */
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252 | bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
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253 | }
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254 |
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255 | if (!(opts & OPT_d)) {
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256 | /* No -d "Debug", we log to log file.
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257 | * This includes any output from children.
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258 | */
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259 | xmove_fd(xopen(opt_logfile, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
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260 | xdup2(STDOUT_FILENO, STDERR_FILENO);
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261 | /* Also, acpid's messages (but not children) will go to syslog too */
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262 | openlog(applet_name, LOG_PID, LOG_DAEMON);
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263 | logmode = LOGMODE_SYSLOG | LOGMODE_STDIO;
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264 | }
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265 | /* else: -d "Debug", log is not redirected */
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266 |
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267 | parse_conf_file(opt_action);
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268 | parse_map_file(opt_map);
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269 |
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270 | xchdir(opt_dir);
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271 |
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272 | /* We spawn children but don't wait for them. Prevent zombies: */
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273 | bb_signals((1 << SIGCHLD), SIG_IGN);
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274 | // If you enable this, (1) explain why, (2)
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275 | // make sure while(poll) loop below is still interruptible
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276 | // by SIGTERM et al:
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277 | //bb_signals(BB_FATAL_SIGS, record_signo);
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278 |
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279 | pfd = NULL;
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280 | nfd = 0;
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281 | while (1) {
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282 | int fd;
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283 | char *dev_event;
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284 |
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285 | dev_event = xasprintf((opts & OPT_e) ? "%s" : "%s%u", opt_input, nfd);
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286 | fd = open(dev_event, O_RDONLY | O_NONBLOCK);
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287 | if (fd < 0) {
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288 | if (nfd == 0)
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289 | bb_simple_perror_msg_and_die(dev_event);
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290 | break;
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291 | }
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292 | free(dev_event);
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293 | pfd = xrealloc_vector(pfd, 1, nfd);
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294 | pfd[nfd].fd = fd;
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295 | pfd[nfd].events = POLLIN;
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296 | nfd++;
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297 | }
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298 |
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299 | write_pidfile(opt_pidfile);
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300 |
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301 | while (safe_poll(pfd, nfd, -1) > 0) {
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302 | int i;
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303 | for (i = 0; i < nfd; i++) {
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304 | const char *event;
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305 |
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306 | if (!(pfd[i].revents & POLLIN)) {
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307 | if (pfd[i].revents == 0)
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308 | continue; /* this fd has nothing */
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309 |
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310 | /* Likely POLLERR, POLLHUP, POLLNVAL.
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311 | * Do not listen on this fd anymore.
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312 | */
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313 | close(pfd[i].fd);
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314 | nfd--;
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315 | for (; i < nfd; i++)
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316 | pfd[i].fd = pfd[i + 1].fd;
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317 | break; /* do poll() again */
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318 | }
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319 |
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320 | event = NULL;
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321 | if (option_mask32 & OPT_e) {
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322 | char *buf;
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323 | int len;
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324 |
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325 | buf = xmalloc_reads(pfd[i].fd, NULL);
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326 | /* buf = "button/power PWRB 00000080 00000000" */
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327 | len = strlen(buf) - 9;
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328 | if (len >= 0)
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329 | buf[len] = '\0';
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330 | event = find_action(NULL, buf);
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331 | free(buf);
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332 | } else {
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333 | struct input_event ev;
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334 |
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335 | if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev)))
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336 | continue;
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337 |
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338 | if (ev.value != 1 && ev.value != 0)
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339 | continue;
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340 |
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341 | event = find_action(&ev, NULL);
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342 | }
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343 | if (!event)
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344 | continue;
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345 | /* spawn event handler */
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346 | process_event(event);
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347 | }
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348 | }
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349 |
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350 | if (ENABLE_FEATURE_CLEAN_UP) {
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351 | while (nfd--)
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352 | close(pfd[nfd].fd);
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353 | free(pfd);
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354 | }
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355 | remove_pidfile(opt_pidfile);
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356 |
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357 | return EXIT_SUCCESS;
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358 | }
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