1 /* vi: set sw=4 ts=4: */
2 /*
3 * simple ACPI events listener
4 *
5 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
6 *
7 * Licensed under GPLv2, see file LICENSE in this source tree.
8 */
9 //config:config ACPID
10 //config: bool "acpid (9 kb)"
11 //config: default y
12 //config: help
13 //config: acpid listens to ACPI events coming either in textual form from
14 //config: /proc/acpi/event (though it is marked deprecated it is still widely
15 //config: used and _is_ a standard) or in binary form from specified evdevs
16 //config: (just use /dev/input/event*).
17 //config:
18 //config: It parses the event to retrieve ACTION and a possible PARAMETER.
19 //config: It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
20 //config: (if the resulting path is a directory) or directly as an executable.
21 //config:
22 //config: N.B. acpid relies on run-parts so have the latter installed.
23 //config:
24 //config:config FEATURE_ACPID_COMPAT
25 //config: bool "Accept and ignore redundant options"
26 //config: default y
27 //config: depends on ACPID
28 //config: help
29 //config: Accept and ignore compatibility options -g -m -s -S -v.
30
31 //applet:IF_ACPID(APPLET(acpid, BB_DIR_SBIN, BB_SUID_DROP))
32
33 //kbuild:lib-$(CONFIG_ACPID) += acpid.o
34
35 //usage:#define acpid_trivial_usage
36 //usage: "[-df] [-c CONFDIR] [-l LOGFILE] [-a ACTIONFILE] [-M MAPFILE] [-e PROC_EVENT_FILE] [-p PIDFILE]"
37 //usage:#define acpid_full_usage "\n\n"
38 //usage: "Listen to ACPI events and spawn specific helpers on event arrival\n"
39 //usage: "\n -d Log to stderr, not log file (implies -f)"
40 //usage: "\n -f Run in foreground"
41 //usage: "\n -c DIR Config directory [/etc/acpi]"
42 //usage: "\n -e FILE /proc event file [/proc/acpi/event]"
43 //usage: "\n -l FILE Log file [/var/log/acpid.log]"
44 //usage: IF_FEATURE_PIDFILE(
45 //usage: "\n -p FILE Pid file [" CONFIG_PID_FILE_PATH "/acpid.pid]"
46 //usage: )
47 //usage: "\n -a FILE Action file [/etc/acpid.conf]"
48 //usage: "\n -M FILE Map file [/etc/acpi.map]"
49 //usage: IF_FEATURE_ACPID_COMPAT(
50 //usage: "\n\nAccept and ignore compatibility options -g -m -s -S -v"
51 //usage: )
52 //usage:
53 //usage:#define acpid_example_usage
54 //usage: "Without -e option, acpid uses all /dev/input/event* files\n"
55 //usage: "# acpid\n"
56 //usage: "# acpid -l /var/log/my-acpi-log\n"
57 //usage: "# acpid -e /proc/acpi/event\n"
58
59 #include "libbb.h"
60 #include <syslog.h>
61 #include <linux/input.h>
62
63 #ifndef EV_SW
64 # define EV_SW 0x05
65 #endif
66 #ifndef EV_KEY
67 # define EV_KEY 0x01
68 #endif
69 #ifndef SW_LID
70 # define SW_LID 0x00
71 #endif
72 #ifndef SW_RFKILL_ALL
73 # define SW_RFKILL_ALL 0x03
74 #endif
75 #ifndef KEY_POWER
76 # define KEY_POWER 116 /* SC System Power Down */
77 #endif
78 #ifndef KEY_SLEEP
79 # define KEY_SLEEP 142 /* SC System Sleep */
80 #endif
81
82 enum {
83 OPT_c = (1 << 0),
84 OPT_d = (1 << 1),
85 OPT_e = (1 << 2),
86 OPT_f = (1 << 3),
87 OPT_l = (1 << 4),
88 OPT_a = (1 << 5),
89 OPT_M = (1 << 6),
90 OPT_p = (1 << 7) * ENABLE_FEATURE_PIDFILE,
91 };
92
93 struct acpi_event {
94 const char *s_type;
95 uint16_t n_type;
96 const char *s_code;
97 uint16_t n_code;
98 uint32_t value;
99 const char *desc;
100 };
101
102 static const struct acpi_event f_evt_tab[] ALIGN_PTR = {
103 { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRF 00000080" },
104 { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRB 00000080" },
105 { "EV_SW", 0x05, "SW_LID", 0x00, 1, "button/lid LID0 00000080" },
106 };
107
108 struct acpi_action {
109 const char *key;
110 const char *action;
111 };
112
113 static const struct acpi_action f_act_tab[] ALIGN_PTR = {
114 { "PWRF", "PWRF/00000080" },
115 { "LID0", "LID/00000080" },
116 };
117
118 struct globals {
119 struct acpi_action *act_tab;
120 int n_act;
121 struct acpi_event *evt_tab;
122 int n_evt;
123 } FIX_ALIASING;
124 #define G (*ptr_to_globals)
125 #define act_tab (G.act_tab)
126 #define n_act (G.n_act )
127 #define evt_tab (G.evt_tab)
128 #define n_evt (G.n_evt )
129 #define INIT_G() do { \
130 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
131 } while (0)
132
133 /*
134 * acpid listens to ACPI events coming either in textual form
135 * from /proc/acpi/event (though it is marked deprecated,
136 * it is still widely used and _is_ a standard) or in binary form
137 * from specified evdevs (just use /dev/input/event*).
138 * It parses the event to retrieve ACTION and a possible PARAMETER.
139 * It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
140 * (if the resulting path is a directory) or directly.
141 * If the resulting path does not exist it logs it via perror
142 * and continues listening.
143 */
144
process_event(const char * event)145 static void process_event(const char *event)
146 {
147 struct stat st;
148 char *handler = xasprintf("./%s", event);
149 const char *args[] = { "run-parts", handler, NULL };
150
151 // log the event
152 bb_simple_error_msg(event);
153
154 // spawn handler
155 // N.B. run-parts would require scripts to have #!/bin/sh
156 // handler is directory? -> use run-parts
157 // handler is file? -> run it directly
158 if (0 == stat(event, &st))
159 spawn((char **)args + (0==(st.st_mode & S_IFDIR)));
160 else
161 bb_simple_perror_msg(event);
162
163 free(handler);
164 }
165
find_action(struct input_event * ev,const char * buf)166 static const char *find_action(struct input_event *ev, const char *buf)
167 {
168 const char *action = NULL;
169 int i;
170
171 // map event
172 for (i = 0; i < n_evt; i++) {
173 if (ev) {
174 if (ev->type == evt_tab[i].n_type && ev->code == evt_tab[i].n_code && ev->value == evt_tab[i].value) {
175 action = evt_tab[i].desc;
176 break;
177 }
178 }
179
180 if (buf) {
181 if (is_prefixed_with(evt_tab[i].desc, buf)) {
182 action = evt_tab[i].desc;
183 break;
184 }
185 }
186 }
187
188 // get action
189 if (action) {
190 for (i = 0; i < n_act; i++) {
191 if (strstr(action, act_tab[i].key)) {
192 action = act_tab[i].action;
193 break;
194 }
195 }
196 }
197
198 return action;
199 }
200
parse_conf_file(const char * filename)201 static void parse_conf_file(const char *filename)
202 {
203 parser_t *parser;
204 char *tokens[2];
205
206 parser = config_open2(filename, fopen_for_read);
207
208 if (parser) {
209 while (config_read(parser, tokens, 2, 2, "# \t", PARSE_NORMAL)) {
210 act_tab = xrealloc_vector(act_tab, 1, n_act);
211 act_tab[n_act].key = xstrdup(tokens[0]);
212 act_tab[n_act].action = xstrdup(tokens[1]);
213 n_act++;
214 }
215 config_close(parser);
216 } else {
217 act_tab = (void*)f_act_tab;
218 n_act = ARRAY_SIZE(f_act_tab);
219 }
220 }
221
parse_map_file(const char * filename)222 static void parse_map_file(const char *filename)
223 {
224 parser_t *parser;
225 char *tokens[6];
226
227 parser = config_open2(filename, fopen_for_read);
228
229 if (parser) {
230 while (config_read(parser, tokens, 6, 6, "# \t", PARSE_NORMAL)) {
231 evt_tab = xrealloc_vector(evt_tab, 1, n_evt);
232 evt_tab[n_evt].s_type = xstrdup(tokens[0]);
233 evt_tab[n_evt].n_type = xstrtou(tokens[1], 16);
234 evt_tab[n_evt].s_code = xstrdup(tokens[2]);
235 evt_tab[n_evt].n_code = xatou16(tokens[3]);
236 evt_tab[n_evt].value = xatoi_positive(tokens[4]);
237 evt_tab[n_evt].desc = xstrdup(tokens[5]);
238 n_evt++;
239 }
240 config_close(parser);
241 } else {
242 evt_tab = (void*)f_evt_tab;
243 n_evt = ARRAY_SIZE(f_evt_tab);
244 }
245 }
246
247 /*
248 * acpid [-c conf_dir] [-r conf_file ] [-a map_file ] [-l log_file] [-e proc_event_file]
249 */
250
251 int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
acpid_main(int argc UNUSED_PARAM,char ** argv)252 int acpid_main(int argc UNUSED_PARAM, char **argv)
253 {
254 int nfd;
255 int opts;
256 struct pollfd *pfd;
257 const char *opt_dir = "/etc/acpi";
258 const char *opt_input = "/dev/input/event";
259 const char *opt_logfile = "/var/log/acpid.log";
260 const char *opt_action = "/etc/acpid.conf";
261 const char *opt_map = "/etc/acpi.map";
262 #if ENABLE_FEATURE_PIDFILE
263 const char *opt_pidfile = CONFIG_PID_FILE_PATH "/acpid.pid";
264 #endif
265
266 INIT_G();
267
268 opts = getopt32(argv, "^"
269 "c:de:fl:a:M:"
270 IF_FEATURE_PIDFILE("p:")
271 IF_FEATURE_ACPID_COMPAT("g:m:s:S:v")
272 "\0"
273 "df:e--e",
274 &opt_dir, &opt_input, &opt_logfile, &opt_action, &opt_map
275 IF_FEATURE_PIDFILE(, &opt_pidfile)
276 IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL)
277 );
278
279 if (!(opts & OPT_f)) {
280 /* No -f "Foreground", we go to background */
281 bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
282 }
283
284 if (!(opts & OPT_d)) {
285 /* No -d "Debug", we log to log file.
286 * This includes any output from children.
287 */
288 xmove_fd(xopen(opt_logfile, O_WRONLY | O_CREAT | O_APPEND), STDOUT_FILENO);
289 xdup2(STDOUT_FILENO, STDERR_FILENO);
290 /* Also, acpid's messages (but not children) will go to syslog too */
291 openlog(applet_name, LOG_PID, LOG_DAEMON);
292 logmode = LOGMODE_SYSLOG | LOGMODE_STDIO;
293 }
294 /* else: -d "Debug", log is not redirected */
295
296 parse_conf_file(opt_action);
297 parse_map_file(opt_map);
298
299 xchdir(opt_dir);
300
301 /* We spawn children but don't wait for them. Prevent zombies: */
302 bb_signals((1 << SIGCHLD), SIG_IGN);
303 // If you enable this, (1) explain why, (2)
304 // make sure while(poll) loop below is still interruptible
305 // by SIGTERM et al:
306 //bb_signals(BB_FATAL_SIGS, record_signo);
307
308 pfd = NULL;
309 nfd = 0;
310 while (1) {
311 int fd;
312 char *dev_event;
313
314 dev_event = xasprintf((opts & OPT_e) ? "%s" : "%s%u", opt_input, nfd);
315 fd = open(dev_event, O_RDONLY | O_NONBLOCK);
316 if (fd < 0) {
317 if (nfd == 0)
318 bb_simple_perror_msg_and_die(dev_event);
319 break;
320 }
321 free(dev_event);
322 pfd = xrealloc_vector(pfd, 1, nfd);
323 pfd[nfd].fd = fd;
324 pfd[nfd].events = POLLIN;
325 nfd++;
326 }
327
328 write_pidfile(opt_pidfile);
329
330 while (safe_poll(pfd, nfd, -1) > 0) {
331 int i;
332 for (i = 0; i < nfd; i++) {
333 const char *event;
334
335 if (!(pfd[i].revents & POLLIN)) {
336 if (pfd[i].revents == 0)
337 continue; /* this fd has nothing */
338
339 /* Likely POLLERR, POLLHUP, POLLNVAL.
340 * Do not listen on this fd anymore.
341 */
342 close(pfd[i].fd);
343 nfd--;
344 for (; i < nfd; i++)
345 pfd[i].fd = pfd[i + 1].fd;
346 break; /* do poll() again */
347 }
348
349 event = NULL;
350 if (option_mask32 & OPT_e) {
351 char *buf;
352 int len;
353
354 buf = xmalloc_reads(pfd[i].fd, NULL);
355 /* buf = "button/power PWRB 00000080 00000000" */
356 len = strlen(buf) - 9;
357 if (len >= 0)
358 buf[len] = '\0';
359 event = find_action(NULL, buf);
360 free(buf);
361 } else {
362 struct input_event ev;
363
364 if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev)))
365 continue;
366
367 if (ev.value != 1 && ev.value != 0)
368 continue;
369
370 event = find_action(&ev, NULL);
371 }
372 if (!event)
373 continue;
374 /* spawn event handler */
375 process_event(event);
376 }
377 }
378
379 if (ENABLE_FEATURE_CLEAN_UP) {
380 while (nfd--)
381 close(pfd[nfd].fd);
382 free(pfd);
383 }
384 remove_pidfile(opt_pidfile);
385
386 return EXIT_SUCCESS;
387 }
388