release/src/router/busybox/util-linux/acpid.c

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