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 //usage:#define acpid_trivial_usage
11 //usage: "[-df] [-c CONFDIR] [-l LOGFILE] [-a ACTIONFILE] [-M MAPFILE] [-e PROC_EVENT_FILE] [-p PIDFILE]"
12 //usage:#define acpid_full_usage "\n\n"
13 //usage: "Listen to ACPI events and spawn specific helpers on event arrival\n"
14 //usage: "\n -d Log to stderr, not log file (implies -f)"
15 //usage: "\n -f Run in foreground"
16 //usage: "\n -c DIR Config directory [/etc/acpi]"
17 //usage: "\n -e FILE /proc event file [/proc/acpi/event]"
18 //usage: "\n -l FILE Log file [/var/log/acpid.log]"
19 //usage: "\n -p FILE Pid file [/var/run/acpid.pid]"
20 //usage: "\n -a FILE Action file [/etc/acpid.conf]"
21 //usage: "\n -M FILE Map file [/etc/acpi.map]"
22 //usage: IF_FEATURE_ACPID_COMPAT(
23 //usage: "\n\nAccept and ignore compatibility options -g -m -s -S -v"
26 //usage:#define acpid_example_usage
27 //usage: "Without -e option, acpid uses all /dev/input/event* files\n"
29 //usage: "# acpid -l /var/log/my-acpi-log\n"
30 //usage: "# acpid -e /proc/acpi/event\n"
34 #include <linux/input.h>
46 # define SW_RFKILL_ALL 0x03
49 # define KEY_POWER 116 /* SC System Power Down */
52 # define KEY_SLEEP 142 /* SC System Sleep */
63 OPT_p = (1 << 7) * ENABLE_FEATURE_PIDFILE,
75 static const struct acpi_event f_evt_tab[] = {
76 { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRF 00000080" },
77 { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRB 00000080" },
78 { "EV_SW", 0x05, "SW_LID", 0x00, 1, "button/lid LID0 00000080" },
86 static const struct acpi_action f_act_tab[] = {
87 { "PWRF", "PWRF/00000080" },
88 { "LID0", "LID/00000080" },
92 struct acpi_action *act_tab;
94 struct acpi_event *evt_tab;
97 #define G (*ptr_to_globals)
98 #define act_tab (G.act_tab)
99 #define n_act (G.n_act )
100 #define evt_tab (G.evt_tab)
101 #define n_evt (G.n_evt )
102 #define INIT_G() do { \
103 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
107 * acpid listens to ACPI events coming either in textual form
108 * from /proc/acpi/event (though it is marked deprecated,
109 * it is still widely used and _is_ a standard) or in binary form
110 * from specified evdevs (just use /dev/input/event*).
111 * It parses the event to retrieve ACTION and a possible PARAMETER.
112 * It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
113 * (if the resulting path is a directory) or directly.
114 * If the resulting path does not exist it logs it via perror
115 * and continues listening.
118 static void process_event(const char *event)
121 char *handler = xasprintf("./%s", event);
122 const char *args[] = { "run-parts", handler, NULL };
125 bb_error_msg("%s", event);
128 // N.B. run-parts would require scripts to have #!/bin/sh
129 // handler is directory? -> use run-parts
130 // handler is file? -> run it directly
131 if (0 == stat(event, &st))
132 spawn((char **)args + (0==(st.st_mode & S_IFDIR)));
134 bb_simple_perror_msg(event);
139 static const char *find_action(struct input_event *ev, const char *buf)
141 const char *action = NULL;
145 for (i = 0; i < n_evt; i++) {
147 if (ev->type == evt_tab[i].n_type && ev->code == evt_tab[i].n_code && ev->value == evt_tab[i].value) {
148 action = evt_tab[i].desc;
154 if (is_prefixed_with(evt_tab[i].desc, buf)) {
155 action = evt_tab[i].desc;
163 for (i = 0; i < n_act; i++) {
164 if (strstr(action, act_tab[i].key)) {
165 action = act_tab[i].action;
174 static void parse_conf_file(const char *filename)
179 parser = config_open2(filename, fopen_for_read);
182 while (config_read(parser, tokens, 2, 2, "# \t", PARSE_NORMAL)) {
183 act_tab = xrealloc_vector(act_tab, 1, n_act);
184 act_tab[n_act].key = xstrdup(tokens[0]);
185 act_tab[n_act].action = xstrdup(tokens[1]);
188 config_close(parser);
190 act_tab = (void*)f_act_tab;
191 n_act = ARRAY_SIZE(f_act_tab);
195 static void parse_map_file(const char *filename)
200 parser = config_open2(filename, fopen_for_read);
203 while (config_read(parser, tokens, 6, 6, "# \t", PARSE_NORMAL)) {
204 evt_tab = xrealloc_vector(evt_tab, 1, n_evt);
205 evt_tab[n_evt].s_type = xstrdup(tokens[0]);
206 evt_tab[n_evt].n_type = xstrtou(tokens[1], 16);
207 evt_tab[n_evt].s_code = xstrdup(tokens[2]);
208 evt_tab[n_evt].n_code = xatou16(tokens[3]);
209 evt_tab[n_evt].value = xatoi_positive(tokens[4]);
210 evt_tab[n_evt].desc = xstrdup(tokens[5]);
213 config_close(parser);
215 evt_tab = (void*)f_evt_tab;
216 n_evt = ARRAY_SIZE(f_evt_tab);
221 * acpid [-c conf_dir] [-r conf_file ] [-a map_file ] [-l log_file] [-e proc_event_file]
224 int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
225 int acpid_main(int argc UNUSED_PARAM, char **argv)
230 const char *opt_dir = "/etc/acpi";
231 const char *opt_input = "/dev/input/event";
232 const char *opt_logfile = "/var/log/acpid.log";
233 const char *opt_action = "/etc/acpid.conf";
234 const char *opt_map = "/etc/acpi.map";
235 #if ENABLE_FEATURE_PIDFILE
236 const char *opt_pidfile = CONFIG_PID_FILE_PATH "/acpid.pid";
241 opt_complementary = "df:e--e";
242 opts = getopt32(argv, "c:de:fl:a:M:" IF_FEATURE_PIDFILE("p:") IF_FEATURE_ACPID_COMPAT("g:m:s:S:v"),
243 &opt_dir, &opt_input, &opt_logfile, &opt_action, &opt_map
244 IF_FEATURE_PIDFILE(, &opt_pidfile)
245 IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL)
248 if (!(opts & OPT_f)) {
249 /* No -f "Foreground", we go to background */
250 bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
253 if (!(opts & OPT_d)) {
254 /* No -d "Debug", we log to log file.
255 * This includes any output from children.
257 xmove_fd(xopen(opt_logfile, O_WRONLY | O_CREAT | O_APPEND), STDOUT_FILENO);
258 xdup2(STDOUT_FILENO, STDERR_FILENO);
259 /* Also, acpid's messages (but not children) will go to syslog too */
260 openlog(applet_name, LOG_PID, LOG_DAEMON);
261 logmode = LOGMODE_SYSLOG | LOGMODE_STDIO;
263 /* else: -d "Debug", log is not redirected */
265 parse_conf_file(opt_action);
266 parse_map_file(opt_map);
270 /* We spawn children but don't wait for them. Prevent zombies: */
271 bb_signals((1 << SIGCHLD), SIG_IGN);
272 // If you enable this, (1) explain why, (2)
273 // make sure while(poll) loop below is still interruptible
275 //bb_signals(BB_FATAL_SIGS, record_signo);
283 dev_event = xasprintf((opts & OPT_e) ? "%s" : "%s%u", opt_input, nfd);
284 fd = open(dev_event, O_RDONLY | O_NONBLOCK);
287 bb_simple_perror_msg_and_die(dev_event);
291 pfd = xrealloc_vector(pfd, 1, nfd);
293 pfd[nfd].events = POLLIN;
297 write_pidfile(opt_pidfile);
299 while (safe_poll(pfd, nfd, -1) > 0) {
301 for (i = 0; i < nfd; i++) {
304 if (!(pfd[i].revents & POLLIN)) {
305 if (pfd[i].revents == 0)
306 continue; /* this fd has nothing */
308 /* Likely POLLERR, POLLHUP, POLLNVAL.
309 * Do not listen on this fd anymore.
314 pfd[i].fd = pfd[i + 1].fd;
315 break; /* do poll() again */
319 if (option_mask32 & OPT_e) {
323 buf = xmalloc_reads(pfd[i].fd, NULL);
324 /* buf = "button/power PWRB 00000080 00000000" */
325 len = strlen(buf) - 9;
328 event = find_action(NULL, buf);
331 struct input_event ev;
333 if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev)))
336 if (ev.value != 1 && ev.value != 0)
339 event = find_action(&ev, NULL);
343 /* spawn event handler */
344 process_event(event);
348 if (ENABLE_FEATURE_CLEAN_UP) {
353 remove_pidfile(opt_pidfile);