[3320] | 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 | #include "libbb.h"
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| 10 | #include <syslog.h>
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| 11 | #include <linux/input.h>
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| 12 |
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| 13 | enum {
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| 14 | OPT_c = (1 << 0),
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| 15 | OPT_d = (1 << 1),
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| 16 | OPT_e = (1 << 2),
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| 17 | OPT_f = (1 << 3),
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| 18 | OPT_l = (1 << 4),
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| 19 | OPT_a = (1 << 5),
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| 20 | OPT_M = (1 << 6),
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| 21 | OPT_p = (1 << 7) * ENABLE_FEATURE_PIDFILE,
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| 22 | };
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| 23 |
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| 24 | struct acpi_event {
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| 25 | const char *s_type;
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| 26 | uint16_t n_type;
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| 27 | const char *s_code;
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| 28 | uint16_t n_code;
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| 29 | uint32_t value;
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| 30 | const char *desc;
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| 31 | };
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| 32 |
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| 33 | static const struct acpi_event f_evt_tab[] = {
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| 34 | { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRF 00000080" },
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| 35 | { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRB 00000080" },
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| 36 | };
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| 37 |
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| 38 | struct acpi_action {
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| 39 | const char *key;
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| 40 | const char *action;
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| 41 | };
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| 42 |
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| 43 | static const struct acpi_action f_act_tab[] = {
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| 44 | { "PWRF", "PWRF/00000080" },
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| 45 | { "LID0", "LID/00000080" },
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| 46 | };
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| 47 |
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| 48 | struct globals {
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| 49 | struct acpi_action *act_tab;
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| 50 | int n_act;
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| 51 | struct acpi_event *evt_tab;
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| 52 | int n_evt;
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| 53 | } FIX_ALIASING;
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| 54 | #define G (*ptr_to_globals)
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| 55 | #define act_tab (G.act_tab)
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| 56 | #define n_act (G.n_act )
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| 57 | #define evt_tab (G.evt_tab)
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| 58 | #define n_evt (G.n_evt )
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| 59 | #define INIT_G() do { \
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| 60 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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| 61 | } while (0)
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| 62 |
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| 63 | /*
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| 64 | * acpid listens to ACPI events coming either in textual form
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| 65 | * from /proc/acpi/event (though it is marked deprecated,
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| 66 | * it is still widely used and _is_ a standard) or in binary form
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| 67 | * from specified evdevs (just use /dev/input/event*).
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| 68 | * It parses the event to retrieve ACTION and a possible PARAMETER.
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| 69 | * It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
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| 70 | * (if the resulting path is a directory) or directly.
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| 71 | * If the resulting path does not exist it logs it via perror
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| 72 | * and continues listening.
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| 73 | */
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| 74 |
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| 75 | static void process_event(const char *event)
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| 76 | {
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| 77 | struct stat st;
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| 78 | char *handler = xasprintf("./%s", event);
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| 79 | const char *args[] = { "run-parts", handler, NULL };
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| 80 |
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| 81 | // debug info
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| 82 | if (option_mask32 & OPT_d) {
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| 83 | bb_error_msg("%s", event);
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| 84 | }
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| 85 |
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| 86 | // spawn handler
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| 87 | // N.B. run-parts would require scripts to have #!/bin/sh
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| 88 | // handler is directory? -> use run-parts
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| 89 | // handler is file? -> run it directly
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| 90 | if (0 == stat(event, &st))
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| 91 | spawn((char **)args + (0==(st.st_mode & S_IFDIR)));
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| 92 | else
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| 93 | bb_simple_perror_msg(event);
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| 94 |
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| 95 | free(handler);
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| 96 | }
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| 97 |
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| 98 | static const char *find_action(struct input_event *ev, const char *buf)
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| 99 | {
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| 100 | const char *action = NULL;
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| 101 | int i;
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| 102 |
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| 103 | // map event
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| 104 | for (i = 0; i < n_evt; i++) {
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| 105 | if (ev) {
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| 106 | 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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| 107 | action = evt_tab[i].desc;
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| 108 | break;
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| 109 | }
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| 110 | }
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| 111 |
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| 112 | if (buf) {
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| 113 | if (strncmp(buf, evt_tab[i].desc, strlen(buf)) == 0) {
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| 114 | action = evt_tab[i].desc;
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| 115 | break;
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| 116 | }
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| 117 | }
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| 118 | }
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| 119 |
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| 120 | // get action
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| 121 | if (action) {
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| 122 | for (i = 0; i < n_act; i++) {
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| 123 | if (strstr(action, act_tab[i].key)) {
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| 124 | action = act_tab[i].action;
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| 125 | break;
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| 126 | }
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| 127 | }
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| 128 | }
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| 129 |
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| 130 | return action;
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| 131 | }
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| 132 |
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| 133 | static void parse_conf_file(const char *filename)
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| 134 | {
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| 135 | parser_t *parser;
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| 136 | char *tokens[2];
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| 137 |
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| 138 | parser = config_open2(filename, fopen_for_read);
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| 139 |
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| 140 | if (parser) {
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| 141 | while (config_read(parser, tokens, 2, 2, "# \t", PARSE_NORMAL)) {
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| 142 | act_tab = xrealloc_vector(act_tab, 1, n_act);
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| 143 | act_tab[n_act].key = xstrdup(tokens[0]);
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| 144 | act_tab[n_act].action = xstrdup(tokens[1]);
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| 145 | n_act++;
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| 146 | }
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| 147 | config_close(parser);
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| 148 | } else {
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| 149 | act_tab = (void*)f_act_tab;
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| 150 | n_act = ARRAY_SIZE(f_act_tab);
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| 151 | }
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| 152 | }
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| 153 |
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| 154 | static void parse_map_file(const char *filename)
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| 155 | {
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| 156 | parser_t *parser;
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| 157 | char *tokens[6];
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| 158 |
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| 159 | parser = config_open2(filename, fopen_for_read);
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| 160 |
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| 161 | if (parser) {
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| 162 | while (config_read(parser, tokens, 6, 6, "# \t", PARSE_NORMAL)) {
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| 163 | evt_tab = xrealloc_vector(evt_tab, 1, n_evt);
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| 164 | evt_tab[n_evt].s_type = xstrdup(tokens[0]);
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| 165 | evt_tab[n_evt].n_type = xstrtou(tokens[1], 16);
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| 166 | evt_tab[n_evt].s_code = xstrdup(tokens[2]);
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| 167 | evt_tab[n_evt].n_code = xatou16(tokens[3]);
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| 168 | evt_tab[n_evt].value = xatoi_positive(tokens[4]);
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| 169 | evt_tab[n_evt].desc = xstrdup(tokens[5]);
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| 170 | n_evt++;
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| 171 | }
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| 172 | config_close(parser);
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| 173 | } else {
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| 174 | evt_tab = (void*)f_evt_tab;
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| 175 | n_evt = ARRAY_SIZE(f_evt_tab);
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| 176 | }
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| 177 | }
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| 178 |
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| 179 | /*
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| 180 | * acpid [-c conf_dir] [-r conf_file ] [-a map_file ] [-l log_file] [-e proc_event_file]
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| 181 | */
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| 182 |
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| 183 | int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 184 | int acpid_main(int argc UNUSED_PARAM, char **argv)
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| 185 | {
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| 186 | struct input_event ev;
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| 187 | int nfd;
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| 188 | int opts;
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| 189 | struct pollfd *pfd;
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| 190 | const char *opt_dir = "/etc/acpi";
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| 191 | const char *opt_input = "/dev/input/event";
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| 192 | const char *opt_logfile = "/var/log/acpid.log";
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| 193 | const char *opt_action = "/etc/acpid.conf";
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| 194 | const char *opt_map = "/etc/acpi.map";
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| 195 | #if ENABLE_FEATURE_PIDFILE
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| 196 | const char *opt_pidfile = "/var/run/acpid.pid";
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| 197 | #endif
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| 198 |
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| 199 | INIT_G();
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| 200 |
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| 201 | opt_complementary = "df:e--e";
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| 202 | 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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| 203 | &opt_dir, &opt_input, &opt_logfile, &opt_action, &opt_map
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| 204 | IF_FEATURE_PIDFILE(, &opt_pidfile)
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| 205 | IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL)
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| 206 | );
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| 207 |
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| 208 | if (!(opts & OPT_f)) {
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| 209 | bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
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| 210 | }
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| 211 |
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| 212 | if (!(opts & OPT_d)) {
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| 213 | openlog(applet_name, LOG_PID, LOG_DAEMON);
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| 214 | logmode = LOGMODE_SYSLOG | LOGMODE_STDIO;
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| 215 | } else {
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| 216 | xmove_fd(xopen(opt_logfile, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
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| 217 | }
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| 218 |
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| 219 | parse_conf_file(opt_action);
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| 220 | parse_map_file(opt_map);
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| 221 |
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| 222 | xchdir(opt_dir);
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| 223 |
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| 224 | bb_signals((1 << SIGCHLD), SIG_IGN);
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| 225 | bb_signals(BB_FATAL_SIGS, record_signo);
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| 226 |
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| 227 | pfd = NULL;
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| 228 | nfd = 0;
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| 229 | while (1) {
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| 230 | int fd;
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| 231 | char *dev_event;
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| 232 |
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| 233 | dev_event = xasprintf((option_mask32 & OPT_e) ? "%s" : "%s%u", opt_input, nfd);
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| 234 | fd = open(dev_event, O_RDONLY | O_NONBLOCK);
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| 235 | if (fd < 0) {
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| 236 | if (nfd == 0)
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| 237 | bb_simple_perror_msg_and_die(dev_event);
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| 238 | break;
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| 239 | }
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| 240 | pfd = xrealloc_vector(pfd, 1, nfd);
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| 241 | pfd[nfd].fd = fd;
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| 242 | pfd[nfd].events = POLLIN;
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| 243 | nfd++;
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| 244 | }
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| 245 |
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| 246 | write_pidfile(opt_pidfile);
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| 247 |
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| 248 | while (poll(pfd, nfd, -1) > 0) {
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| 249 | int i;
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| 250 | for (i = 0; i < nfd; i++) {
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| 251 | const char *event = NULL;
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| 252 |
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| 253 | memset(&ev, 0, sizeof(ev));
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| 254 |
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| 255 | if (!(pfd[i].revents & POLLIN))
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| 256 | continue;
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| 257 |
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| 258 | if (option_mask32 & OPT_e) {
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| 259 | char *buf;
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| 260 | int len;
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| 261 |
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| 262 | buf = xmalloc_reads(pfd[i].fd, NULL, NULL);
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| 263 | /* buf = "button/power PWRB 00000080 00000000" */
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| 264 | len = strlen(buf) - 9;
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| 265 | if (len >= 0)
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| 266 | buf[len] = '\0';
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| 267 | event = find_action(NULL, buf);
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| 268 | } else {
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| 269 | if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev)))
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| 270 | continue;
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| 271 |
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| 272 | if (ev.value != 1 && ev.value != 0)
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| 273 | continue;
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| 274 |
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| 275 | event = find_action(&ev, NULL);
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| 276 | }
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| 277 | if (!event)
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| 278 | continue;
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| 279 | // spawn event handler
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| 280 | process_event(event);
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| 281 | }
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| 282 | }
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| 283 |
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| 284 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 285 | while (nfd--) {
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| 286 | if (pfd[nfd].fd) {
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| 287 | close(pfd[nfd].fd);
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| 288 | }
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| 289 | }
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| 290 | free(pfd);
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| 291 | }
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| 292 | remove_pidfile(opt_pidfile);
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| 293 |
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| 294 | return EXIT_SUCCESS;
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| 295 | }
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