[2725] | 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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[3232] | 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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[2725] | 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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[3232] | 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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[2725] | 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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[3232] | 78 | { "EV_SW", 0x05, "SW_LID", 0x00, 1, "button/lid LID0 00000080" },
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[2725] | 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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[3621] | 124 | // log the event
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| 125 | bb_error_msg("%s", event);
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[2725] | 126 |
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| 127 | // spawn handler
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| 128 | // N.B. run-parts would require scripts to have #!/bin/sh
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| 129 | // handler is directory? -> use run-parts
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| 130 | // handler is file? -> run it directly
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| 131 | if (0 == stat(event, &st))
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| 132 | spawn((char **)args + (0==(st.st_mode & S_IFDIR)));
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| 133 | else
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| 134 | bb_simple_perror_msg(event);
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| 135 |
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| 136 | free(handler);
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| 137 | }
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| 138 |
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| 139 | static const char *find_action(struct input_event *ev, const char *buf)
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| 140 | {
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| 141 | const char *action = NULL;
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| 142 | int i;
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| 143 |
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| 144 | // map event
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| 145 | for (i = 0; i < n_evt; i++) {
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| 146 | if (ev) {
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| 147 | 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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| 148 | action = evt_tab[i].desc;
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| 149 | break;
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| 150 | }
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| 151 | }
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| 152 |
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| 153 | if (buf) {
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[3621] | 154 | if (is_prefixed_with(evt_tab[i].desc, buf)) {
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[2725] | 155 | action = evt_tab[i].desc;
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| 156 | break;
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| 157 | }
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| 158 | }
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| 159 | }
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| 160 |
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| 161 | // get action
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| 162 | if (action) {
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| 163 | for (i = 0; i < n_act; i++) {
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| 164 | if (strstr(action, act_tab[i].key)) {
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| 165 | action = act_tab[i].action;
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| 166 | break;
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| 167 | }
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| 168 | }
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| 169 | }
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| 170 |
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| 171 | return action;
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| 172 | }
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| 173 |
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| 174 | static void parse_conf_file(const char *filename)
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| 175 | {
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| 176 | parser_t *parser;
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| 177 | char *tokens[2];
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| 178 |
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| 179 | parser = config_open2(filename, fopen_for_read);
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| 180 |
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| 181 | if (parser) {
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| 182 | while (config_read(parser, tokens, 2, 2, "# \t", PARSE_NORMAL)) {
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| 183 | act_tab = xrealloc_vector(act_tab, 1, n_act);
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| 184 | act_tab[n_act].key = xstrdup(tokens[0]);
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| 185 | act_tab[n_act].action = xstrdup(tokens[1]);
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| 186 | n_act++;
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| 187 | }
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| 188 | config_close(parser);
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| 189 | } else {
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| 190 | act_tab = (void*)f_act_tab;
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| 191 | n_act = ARRAY_SIZE(f_act_tab);
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| 192 | }
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| 193 | }
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| 194 |
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| 195 | static void parse_map_file(const char *filename)
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| 196 | {
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| 197 | parser_t *parser;
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| 198 | char *tokens[6];
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| 199 |
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| 200 | parser = config_open2(filename, fopen_for_read);
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| 201 |
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| 202 | if (parser) {
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| 203 | while (config_read(parser, tokens, 6, 6, "# \t", PARSE_NORMAL)) {
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| 204 | evt_tab = xrealloc_vector(evt_tab, 1, n_evt);
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| 205 | evt_tab[n_evt].s_type = xstrdup(tokens[0]);
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| 206 | evt_tab[n_evt].n_type = xstrtou(tokens[1], 16);
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| 207 | evt_tab[n_evt].s_code = xstrdup(tokens[2]);
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| 208 | evt_tab[n_evt].n_code = xatou16(tokens[3]);
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| 209 | evt_tab[n_evt].value = xatoi_positive(tokens[4]);
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| 210 | evt_tab[n_evt].desc = xstrdup(tokens[5]);
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| 211 | n_evt++;
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| 212 | }
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| 213 | config_close(parser);
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| 214 | } else {
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| 215 | evt_tab = (void*)f_evt_tab;
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| 216 | n_evt = ARRAY_SIZE(f_evt_tab);
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| 217 | }
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| 218 | }
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| 219 |
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| 220 | /*
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| 221 | * acpid [-c conf_dir] [-r conf_file ] [-a map_file ] [-l log_file] [-e proc_event_file]
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| 222 | */
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| 223 |
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| 224 | int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 225 | int acpid_main(int argc UNUSED_PARAM, char **argv)
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| 226 | {
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| 227 | int nfd;
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| 228 | int opts;
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| 229 | struct pollfd *pfd;
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| 230 | const char *opt_dir = "/etc/acpi";
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| 231 | const char *opt_input = "/dev/input/event";
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| 232 | const char *opt_logfile = "/var/log/acpid.log";
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| 233 | const char *opt_action = "/etc/acpid.conf";
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| 234 | const char *opt_map = "/etc/acpi.map";
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| 235 | #if ENABLE_FEATURE_PIDFILE
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[3232] | 236 | const char *opt_pidfile = CONFIG_PID_FILE_PATH "/acpid.pid";
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[2725] | 237 | #endif
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| 238 |
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| 239 | INIT_G();
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| 240 |
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| 241 | opt_complementary = "df:e--e";
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| 242 | 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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| 243 | &opt_dir, &opt_input, &opt_logfile, &opt_action, &opt_map
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| 244 | IF_FEATURE_PIDFILE(, &opt_pidfile)
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| 245 | IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL)
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| 246 | );
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| 247 |
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| 248 | if (!(opts & OPT_f)) {
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[3232] | 249 | /* No -f "Foreground", we go to background */
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[2725] | 250 | bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
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| 251 | }
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| 252 |
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| 253 | if (!(opts & OPT_d)) {
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[3232] | 254 | /* No -d "Debug", we log to log file.
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| 255 | * This includes any output from children.
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| 256 | */
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[3621] | 257 | xmove_fd(xopen(opt_logfile, O_WRONLY | O_CREAT | O_APPEND), STDOUT_FILENO);
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[3232] | 258 | xdup2(STDOUT_FILENO, STDERR_FILENO);
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| 259 | /* Also, acpid's messages (but not children) will go to syslog too */
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[2725] | 260 | openlog(applet_name, LOG_PID, LOG_DAEMON);
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| 261 | logmode = LOGMODE_SYSLOG | LOGMODE_STDIO;
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| 262 | }
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[3232] | 263 | /* else: -d "Debug", log is not redirected */
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[2725] | 264 |
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| 265 | parse_conf_file(opt_action);
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| 266 | parse_map_file(opt_map);
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| 267 |
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| 268 | xchdir(opt_dir);
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| 269 |
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[3232] | 270 | /* We spawn children but don't wait for them. Prevent zombies: */
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[2725] | 271 | bb_signals((1 << SIGCHLD), SIG_IGN);
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[3232] | 272 | // If you enable this, (1) explain why, (2)
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| 273 | // make sure while(poll) loop below is still interruptible
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| 274 | // by SIGTERM et al:
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| 275 | //bb_signals(BB_FATAL_SIGS, record_signo);
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[2725] | 276 |
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| 277 | pfd = NULL;
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| 278 | nfd = 0;
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| 279 | while (1) {
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| 280 | int fd;
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| 281 | char *dev_event;
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| 282 |
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[3232] | 283 | dev_event = xasprintf((opts & OPT_e) ? "%s" : "%s%u", opt_input, nfd);
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[2725] | 284 | fd = open(dev_event, O_RDONLY | O_NONBLOCK);
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| 285 | if (fd < 0) {
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| 286 | if (nfd == 0)
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| 287 | bb_simple_perror_msg_and_die(dev_event);
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| 288 | break;
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| 289 | }
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[3232] | 290 | free(dev_event);
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[2725] | 291 | pfd = xrealloc_vector(pfd, 1, nfd);
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| 292 | pfd[nfd].fd = fd;
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| 293 | pfd[nfd].events = POLLIN;
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| 294 | nfd++;
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| 295 | }
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| 296 |
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| 297 | write_pidfile(opt_pidfile);
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| 298 |
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[3232] | 299 | while (safe_poll(pfd, nfd, -1) > 0) {
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[2725] | 300 | int i;
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| 301 | for (i = 0; i < nfd; i++) {
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[3232] | 302 | const char *event;
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[2725] | 303 |
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[3232] | 304 | if (!(pfd[i].revents & POLLIN)) {
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| 305 | if (pfd[i].revents == 0)
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| 306 | continue; /* this fd has nothing */
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[2725] | 307 |
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[3232] | 308 | /* Likely POLLERR, POLLHUP, POLLNVAL.
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| 309 | * Do not listen on this fd anymore.
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| 310 | */
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| 311 | close(pfd[i].fd);
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| 312 | nfd--;
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| 313 | for (; i < nfd; i++)
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| 314 | pfd[i].fd = pfd[i + 1].fd;
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| 315 | break; /* do poll() again */
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| 316 | }
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[2725] | 317 |
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[3232] | 318 | event = NULL;
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[2725] | 319 | if (option_mask32 & OPT_e) {
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| 320 | char *buf;
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| 321 | int len;
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| 322 |
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[3232] | 323 | buf = xmalloc_reads(pfd[i].fd, NULL);
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[2725] | 324 | /* buf = "button/power PWRB 00000080 00000000" */
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| 325 | len = strlen(buf) - 9;
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| 326 | if (len >= 0)
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| 327 | buf[len] = '\0';
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| 328 | event = find_action(NULL, buf);
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[3232] | 329 | free(buf);
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[2725] | 330 | } else {
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[3232] | 331 | struct input_event ev;
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| 332 |
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[2725] | 333 | if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev)))
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| 334 | continue;
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| 335 |
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| 336 | if (ev.value != 1 && ev.value != 0)
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| 337 | continue;
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| 338 |
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| 339 | event = find_action(&ev, NULL);
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| 340 | }
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| 341 | if (!event)
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| 342 | continue;
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[3232] | 343 | /* spawn event handler */
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[2725] | 344 | process_event(event);
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| 345 | }
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| 346 | }
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| 347 |
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| 348 | if (ENABLE_FEATURE_CLEAN_UP) {
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[3232] | 349 | while (nfd--)
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| 350 | close(pfd[nfd].fd);
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[2725] | 351 | free(pfd);
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| 352 | }
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| 353 | remove_pidfile(opt_pidfile);
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| 354 |
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| 355 | return EXIT_SUCCESS;
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| 356 | }
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