1 /* vi: set sw=4 ts=4: */
3 * simple ACPI events listener
5 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
7 * Licensed under GPLv2, see file LICENSE in this source tree.
10 //config: bool "acpid (8.7 kb)"
12 //config: select PLATFORM_LINUX
14 //config: acpid listens to ACPI events coming either in textual form from
15 //config: /proc/acpi/event (though it is marked deprecated it is still widely
16 //config: used and _is_ a standard) or in binary form from specified evdevs
17 //config: (just use /dev/input/event*).
19 //config: It parses the event to retrieve ACTION and a possible PARAMETER.
20 //config: It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
21 //config: (if the resulting path is a directory) or directly as an executable.
23 //config: N.B. acpid relies on run-parts so have the latter installed.
25 //config:config FEATURE_ACPID_COMPAT
26 //config: bool "Accept and ignore redundant options"
28 //config: depends on ACPID
30 //config: Accept and ignore compatibility options -g -m -s -S -v.
32 //applet:IF_ACPID(APPLET(acpid, BB_DIR_SBIN, BB_SUID_DROP))
34 //kbuild:lib-$(CONFIG_ACPID) += acpid.o
36 //usage:#define acpid_trivial_usage
37 //usage: "[-df] [-c CONFDIR] [-l LOGFILE] [-a ACTIONFILE] [-M MAPFILE] [-e PROC_EVENT_FILE] [-p PIDFILE]"
38 //usage:#define acpid_full_usage "\n\n"
39 //usage: "Listen to ACPI events and spawn specific helpers on event arrival\n"
40 //usage: "\n -d Log to stderr, not log file (implies -f)"
41 //usage: "\n -f Run in foreground"
42 //usage: "\n -c DIR Config directory [/etc/acpi]"
43 //usage: "\n -e FILE /proc event file [/proc/acpi/event]"
44 //usage: "\n -l FILE Log file [/var/log/acpid.log]"
45 //usage: "\n -p FILE Pid file [/var/run/acpid.pid]"
46 //usage: "\n -a FILE Action file [/etc/acpid.conf]"
47 //usage: "\n -M FILE Map file [/etc/acpi.map]"
48 //usage: IF_FEATURE_ACPID_COMPAT(
49 //usage: "\n\nAccept and ignore compatibility options -g -m -s -S -v"
52 //usage:#define acpid_example_usage
53 //usage: "Without -e option, acpid uses all /dev/input/event* files\n"
55 //usage: "# acpid -l /var/log/my-acpi-log\n"
56 //usage: "# acpid -e /proc/acpi/event\n"
60 #include <linux/input.h>
72 # define SW_RFKILL_ALL 0x03
75 # define KEY_POWER 116 /* SC System Power Down */
78 # define KEY_SLEEP 142 /* SC System Sleep */
89 OPT_p = (1 << 7) * ENABLE_FEATURE_PIDFILE,
101 static const struct acpi_event f_evt_tab[] = {
102 { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRF 00000080" },
103 { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRB 00000080" },
104 { "EV_SW", 0x05, "SW_LID", 0x00, 1, "button/lid LID0 00000080" },
112 static const struct acpi_action f_act_tab[] = {
113 { "PWRF", "PWRF/00000080" },
114 { "LID0", "LID/00000080" },
118 struct acpi_action *act_tab;
120 struct acpi_event *evt_tab;
123 #define G (*ptr_to_globals)
124 #define act_tab (G.act_tab)
125 #define n_act (G.n_act )
126 #define evt_tab (G.evt_tab)
127 #define n_evt (G.n_evt )
128 #define INIT_G() do { \
129 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
133 * acpid listens to ACPI events coming either in textual form
134 * from /proc/acpi/event (though it is marked deprecated,
135 * it is still widely used and _is_ a standard) or in binary form
136 * from specified evdevs (just use /dev/input/event*).
137 * It parses the event to retrieve ACTION and a possible PARAMETER.
138 * It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
139 * (if the resulting path is a directory) or directly.
140 * If the resulting path does not exist it logs it via perror
141 * and continues listening.
144 static void process_event(const char *event)
147 char *handler = xasprintf("./%s", event);
148 const char *args[] = { "run-parts", handler, NULL };
151 bb_error_msg("%s", event);
154 // N.B. run-parts would require scripts to have #!/bin/sh
155 // handler is directory? -> use run-parts
156 // handler is file? -> run it directly
157 if (0 == stat(event, &st))
158 spawn((char **)args + (0==(st.st_mode & S_IFDIR)));
160 bb_simple_perror_msg(event);
165 static const char *find_action(struct input_event *ev, const char *buf)
167 const char *action = NULL;
171 for (i = 0; i < n_evt; i++) {
173 if (ev->type == evt_tab[i].n_type && ev->code == evt_tab[i].n_code && ev->value == evt_tab[i].value) {
174 action = evt_tab[i].desc;
180 if (is_prefixed_with(evt_tab[i].desc, buf)) {
181 action = evt_tab[i].desc;
189 for (i = 0; i < n_act; i++) {
190 if (strstr(action, act_tab[i].key)) {
191 action = act_tab[i].action;
200 static void parse_conf_file(const char *filename)
205 parser = config_open2(filename, fopen_for_read);
208 while (config_read(parser, tokens, 2, 2, "# \t", PARSE_NORMAL)) {
209 act_tab = xrealloc_vector(act_tab, 1, n_act);
210 act_tab[n_act].key = xstrdup(tokens[0]);
211 act_tab[n_act].action = xstrdup(tokens[1]);
214 config_close(parser);
216 act_tab = (void*)f_act_tab;
217 n_act = ARRAY_SIZE(f_act_tab);
221 static void parse_map_file(const char *filename)
226 parser = config_open2(filename, fopen_for_read);
229 while (config_read(parser, tokens, 6, 6, "# \t", PARSE_NORMAL)) {
230 evt_tab = xrealloc_vector(evt_tab, 1, n_evt);
231 evt_tab[n_evt].s_type = xstrdup(tokens[0]);
232 evt_tab[n_evt].n_type = xstrtou(tokens[1], 16);
233 evt_tab[n_evt].s_code = xstrdup(tokens[2]);
234 evt_tab[n_evt].n_code = xatou16(tokens[3]);
235 evt_tab[n_evt].value = xatoi_positive(tokens[4]);
236 evt_tab[n_evt].desc = xstrdup(tokens[5]);
239 config_close(parser);
241 evt_tab = (void*)f_evt_tab;
242 n_evt = ARRAY_SIZE(f_evt_tab);
247 * acpid [-c conf_dir] [-r conf_file ] [-a map_file ] [-l log_file] [-e proc_event_file]
250 int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
251 int acpid_main(int argc UNUSED_PARAM, char **argv)
256 const char *opt_dir = "/etc/acpi";
257 const char *opt_input = "/dev/input/event";
258 const char *opt_logfile = "/var/log/acpid.log";
259 const char *opt_action = "/etc/acpid.conf";
260 const char *opt_map = "/etc/acpi.map";
261 #if ENABLE_FEATURE_PIDFILE
262 const char *opt_pidfile = CONFIG_PID_FILE_PATH "/acpid.pid";
267 opts = getopt32(argv, "^"
269 IF_FEATURE_PIDFILE("p:")
270 IF_FEATURE_ACPID_COMPAT("g:m:s:S:v")
273 &opt_dir, &opt_input, &opt_logfile, &opt_action, &opt_map
274 IF_FEATURE_PIDFILE(, &opt_pidfile)
275 IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL)
278 if (!(opts & OPT_f)) {
279 /* No -f "Foreground", we go to background */
280 bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
283 if (!(opts & OPT_d)) {
284 /* No -d "Debug", we log to log file.
285 * This includes any output from children.
287 xmove_fd(xopen(opt_logfile, O_WRONLY | O_CREAT | O_APPEND), STDOUT_FILENO);
288 xdup2(STDOUT_FILENO, STDERR_FILENO);
289 /* Also, acpid's messages (but not children) will go to syslog too */
290 openlog(applet_name, LOG_PID, LOG_DAEMON);
291 logmode = LOGMODE_SYSLOG | LOGMODE_STDIO;
293 /* else: -d "Debug", log is not redirected */
295 parse_conf_file(opt_action);
296 parse_map_file(opt_map);
300 /* We spawn children but don't wait for them. Prevent zombies: */
301 bb_signals((1 << SIGCHLD), SIG_IGN);
302 // If you enable this, (1) explain why, (2)
303 // make sure while(poll) loop below is still interruptible
305 //bb_signals(BB_FATAL_SIGS, record_signo);
313 dev_event = xasprintf((opts & OPT_e) ? "%s" : "%s%u", opt_input, nfd);
314 fd = open(dev_event, O_RDONLY | O_NONBLOCK);
317 bb_simple_perror_msg_and_die(dev_event);
321 pfd = xrealloc_vector(pfd, 1, nfd);
323 pfd[nfd].events = POLLIN;
327 write_pidfile(opt_pidfile);
329 while (safe_poll(pfd, nfd, -1) > 0) {
331 for (i = 0; i < nfd; i++) {
334 if (!(pfd[i].revents & POLLIN)) {
335 if (pfd[i].revents == 0)
336 continue; /* this fd has nothing */
338 /* Likely POLLERR, POLLHUP, POLLNVAL.
339 * Do not listen on this fd anymore.
344 pfd[i].fd = pfd[i + 1].fd;
345 break; /* do poll() again */
349 if (option_mask32 & OPT_e) {
353 buf = xmalloc_reads(pfd[i].fd, NULL);
354 /* buf = "button/power PWRB 00000080 00000000" */
355 len = strlen(buf) - 9;
358 event = find_action(NULL, buf);
361 struct input_event ev;
363 if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev)))
366 if (ev.value != 1 && ev.value != 0)
369 event = find_action(&ev, NULL);
373 /* spawn event handler */
374 process_event(event);
378 if (ENABLE_FEATURE_CLEAN_UP) {
383 remove_pidfile(opt_pidfile);