| /* vi: set sw=4 ts=4: */ |
| /* |
| * simple ACPI events listener |
| * |
| * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com> |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| */ |
| //config:config ACPID |
| //config: bool "acpid (9 kb)" |
| //config: default y |
| //config: select PLATFORM_LINUX |
| //config: help |
| //config: acpid listens to ACPI events coming either in textual form from |
| //config: /proc/acpi/event (though it is marked deprecated it is still widely |
| //config: used and _is_ a standard) or in binary form from specified evdevs |
| //config: (just use /dev/input/event*). |
| //config: |
| //config: It parses the event to retrieve ACTION and a possible PARAMETER. |
| //config: It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts |
| //config: (if the resulting path is a directory) or directly as an executable. |
| //config: |
| //config: N.B. acpid relies on run-parts so have the latter installed. |
| //config: |
| //config:config FEATURE_ACPID_COMPAT |
| //config: bool "Accept and ignore redundant options" |
| //config: default y |
| //config: depends on ACPID |
| //config: help |
| //config: Accept and ignore compatibility options -g -m -s -S -v. |
| |
| //applet:IF_ACPID(APPLET(acpid, BB_DIR_SBIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_ACPID) += acpid.o |
| |
| //usage:#define acpid_trivial_usage |
| //usage: "[-df] [-c CONFDIR] [-l LOGFILE] [-a ACTIONFILE] [-M MAPFILE] [-e PROC_EVENT_FILE] [-p PIDFILE]" |
| //usage:#define acpid_full_usage "\n\n" |
| //usage: "Listen to ACPI events and spawn specific helpers on event arrival\n" |
| //usage: "\n -d Log to stderr, not log file (implies -f)" |
| //usage: "\n -f Run in foreground" |
| //usage: "\n -c DIR Config directory [/etc/acpi]" |
| //usage: "\n -e FILE /proc event file [/proc/acpi/event]" |
| //usage: "\n -l FILE Log file [/var/log/acpid.log]" |
| //usage: IF_FEATURE_PIDFILE( |
| //usage: "\n -p FILE Pid file [" CONFIG_PID_FILE_PATH "/acpid.pid]" |
| //usage: ) |
| //usage: "\n -a FILE Action file [/etc/acpid.conf]" |
| //usage: "\n -M FILE Map file [/etc/acpi.map]" |
| //usage: IF_FEATURE_ACPID_COMPAT( |
| //usage: "\n\nAccept and ignore compatibility options -g -m -s -S -v" |
| //usage: ) |
| //usage: |
| //usage:#define acpid_example_usage |
| //usage: "Without -e option, acpid uses all /dev/input/event* files\n" |
| //usage: "# acpid\n" |
| //usage: "# acpid -l /var/log/my-acpi-log\n" |
| //usage: "# acpid -e /proc/acpi/event\n" |
| |
| #include "libbb.h" |
| #include <syslog.h> |
| #include <linux/input.h> |
| |
| #ifndef EV_SW |
| # define EV_SW 0x05 |
| #endif |
| #ifndef EV_KEY |
| # define EV_KEY 0x01 |
| #endif |
| #ifndef SW_LID |
| # define SW_LID 0x00 |
| #endif |
| #ifndef SW_RFKILL_ALL |
| # define SW_RFKILL_ALL 0x03 |
| #endif |
| #ifndef KEY_POWER |
| # define KEY_POWER 116 /* SC System Power Down */ |
| #endif |
| #ifndef KEY_SLEEP |
| # define KEY_SLEEP 142 /* SC System Sleep */ |
| #endif |
| |
| enum { |
| OPT_c = (1 << 0), |
| OPT_d = (1 << 1), |
| OPT_e = (1 << 2), |
| OPT_f = (1 << 3), |
| OPT_l = (1 << 4), |
| OPT_a = (1 << 5), |
| OPT_M = (1 << 6), |
| OPT_p = (1 << 7) * ENABLE_FEATURE_PIDFILE, |
| }; |
| |
| struct acpi_event { |
| const char *s_type; |
| uint16_t n_type; |
| const char *s_code; |
| uint16_t n_code; |
| uint32_t value; |
| const char *desc; |
| }; |
| |
| static const struct acpi_event f_evt_tab[] ALIGN_PTR = { |
| { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRF 00000080" }, |
| { "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRB 00000080" }, |
| { "EV_SW", 0x05, "SW_LID", 0x00, 1, "button/lid LID0 00000080" }, |
| }; |
| |
| struct acpi_action { |
| const char *key; |
| const char *action; |
| }; |
| |
| static const struct acpi_action f_act_tab[] ALIGN_PTR = { |
| { "PWRF", "PWRF/00000080" }, |
| { "LID0", "LID/00000080" }, |
| }; |
| |
| struct globals { |
| struct acpi_action *act_tab; |
| int n_act; |
| struct acpi_event *evt_tab; |
| int n_evt; |
| } FIX_ALIASING; |
| #define G (*ptr_to_globals) |
| #define act_tab (G.act_tab) |
| #define n_act (G.n_act ) |
| #define evt_tab (G.evt_tab) |
| #define n_evt (G.n_evt ) |
| #define INIT_G() do { \ |
| SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
| } while (0) |
| |
| /* |
| * acpid listens to ACPI events coming either in textual form |
| * from /proc/acpi/event (though it is marked deprecated, |
| * it is still widely used and _is_ a standard) or in binary form |
| * from specified evdevs (just use /dev/input/event*). |
| * It parses the event to retrieve ACTION and a possible PARAMETER. |
| * It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts |
| * (if the resulting path is a directory) or directly. |
| * If the resulting path does not exist it logs it via perror |
| * and continues listening. |
| */ |
| |
| static void process_event(const char *event) |
| { |
| struct stat st; |
| char *handler = xasprintf("./%s", event); |
| const char *args[] = { "run-parts", handler, NULL }; |
| |
| // log the event |
| bb_simple_error_msg(event); |
| |
| // spawn handler |
| // N.B. run-parts would require scripts to have #!/bin/sh |
| // handler is directory? -> use run-parts |
| // handler is file? -> run it directly |
| if (0 == stat(event, &st)) |
| spawn((char **)args + (0==(st.st_mode & S_IFDIR))); |
| else |
| bb_simple_perror_msg(event); |
| |
| free(handler); |
| } |
| |
| static const char *find_action(struct input_event *ev, const char *buf) |
| { |
| const char *action = NULL; |
| int i; |
| |
| // map event |
| for (i = 0; i < n_evt; i++) { |
| if (ev) { |
| if (ev->type == evt_tab[i].n_type && ev->code == evt_tab[i].n_code && ev->value == evt_tab[i].value) { |
| action = evt_tab[i].desc; |
| break; |
| } |
| } |
| |
| if (buf) { |
| if (is_prefixed_with(evt_tab[i].desc, buf)) { |
| action = evt_tab[i].desc; |
| break; |
| } |
| } |
| } |
| |
| // get action |
| if (action) { |
| for (i = 0; i < n_act; i++) { |
| if (strstr(action, act_tab[i].key)) { |
| action = act_tab[i].action; |
| break; |
| } |
| } |
| } |
| |
| return action; |
| } |
| |
| static void parse_conf_file(const char *filename) |
| { |
| parser_t *parser; |
| char *tokens[2]; |
| |
| parser = config_open2(filename, fopen_for_read); |
| |
| if (parser) { |
| while (config_read(parser, tokens, 2, 2, "# \t", PARSE_NORMAL)) { |
| act_tab = xrealloc_vector(act_tab, 1, n_act); |
| act_tab[n_act].key = xstrdup(tokens[0]); |
| act_tab[n_act].action = xstrdup(tokens[1]); |
| n_act++; |
| } |
| config_close(parser); |
| } else { |
| act_tab = (void*)f_act_tab; |
| n_act = ARRAY_SIZE(f_act_tab); |
| } |
| } |
| |
| static void parse_map_file(const char *filename) |
| { |
| parser_t *parser; |
| char *tokens[6]; |
| |
| parser = config_open2(filename, fopen_for_read); |
| |
| if (parser) { |
| while (config_read(parser, tokens, 6, 6, "# \t", PARSE_NORMAL)) { |
| evt_tab = xrealloc_vector(evt_tab, 1, n_evt); |
| evt_tab[n_evt].s_type = xstrdup(tokens[0]); |
| evt_tab[n_evt].n_type = xstrtou(tokens[1], 16); |
| evt_tab[n_evt].s_code = xstrdup(tokens[2]); |
| evt_tab[n_evt].n_code = xatou16(tokens[3]); |
| evt_tab[n_evt].value = xatoi_positive(tokens[4]); |
| evt_tab[n_evt].desc = xstrdup(tokens[5]); |
| n_evt++; |
| } |
| config_close(parser); |
| } else { |
| evt_tab = (void*)f_evt_tab; |
| n_evt = ARRAY_SIZE(f_evt_tab); |
| } |
| } |
| |
| /* |
| * acpid [-c conf_dir] [-r conf_file ] [-a map_file ] [-l log_file] [-e proc_event_file] |
| */ |
| |
| int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int acpid_main(int argc UNUSED_PARAM, char **argv) |
| { |
| int nfd; |
| int opts; |
| struct pollfd *pfd; |
| const char *opt_dir = "/etc/acpi"; |
| const char *opt_input = "/dev/input/event"; |
| const char *opt_logfile = "/var/log/acpid.log"; |
| const char *opt_action = "/etc/acpid.conf"; |
| const char *opt_map = "/etc/acpi.map"; |
| #if ENABLE_FEATURE_PIDFILE |
| const char *opt_pidfile = CONFIG_PID_FILE_PATH "/acpid.pid"; |
| #endif |
| |
| INIT_G(); |
| |
| opts = getopt32(argv, "^" |
| "c:de:fl:a:M:" |
| IF_FEATURE_PIDFILE("p:") |
| IF_FEATURE_ACPID_COMPAT("g:m:s:S:v") |
| "\0" |
| "df:e--e", |
| &opt_dir, &opt_input, &opt_logfile, &opt_action, &opt_map |
| IF_FEATURE_PIDFILE(, &opt_pidfile) |
| IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL) |
| ); |
| |
| if (!(opts & OPT_f)) { |
| /* No -f "Foreground", we go to background */ |
| bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv); |
| } |
| |
| if (!(opts & OPT_d)) { |
| /* No -d "Debug", we log to log file. |
| * This includes any output from children. |
| */ |
| xmove_fd(xopen(opt_logfile, O_WRONLY | O_CREAT | O_APPEND), STDOUT_FILENO); |
| xdup2(STDOUT_FILENO, STDERR_FILENO); |
| /* Also, acpid's messages (but not children) will go to syslog too */ |
| openlog(applet_name, LOG_PID, LOG_DAEMON); |
| logmode = LOGMODE_SYSLOG | LOGMODE_STDIO; |
| } |
| /* else: -d "Debug", log is not redirected */ |
| |
| parse_conf_file(opt_action); |
| parse_map_file(opt_map); |
| |
| xchdir(opt_dir); |
| |
| /* We spawn children but don't wait for them. Prevent zombies: */ |
| bb_signals((1 << SIGCHLD), SIG_IGN); |
| // If you enable this, (1) explain why, (2) |
| // make sure while(poll) loop below is still interruptible |
| // by SIGTERM et al: |
| //bb_signals(BB_FATAL_SIGS, record_signo); |
| |
| pfd = NULL; |
| nfd = 0; |
| while (1) { |
| int fd; |
| char *dev_event; |
| |
| dev_event = xasprintf((opts & OPT_e) ? "%s" : "%s%u", opt_input, nfd); |
| fd = open(dev_event, O_RDONLY | O_NONBLOCK); |
| if (fd < 0) { |
| if (nfd == 0) |
| bb_simple_perror_msg_and_die(dev_event); |
| break; |
| } |
| free(dev_event); |
| pfd = xrealloc_vector(pfd, 1, nfd); |
| pfd[nfd].fd = fd; |
| pfd[nfd].events = POLLIN; |
| nfd++; |
| } |
| |
| write_pidfile(opt_pidfile); |
| |
| while (safe_poll(pfd, nfd, -1) > 0) { |
| int i; |
| for (i = 0; i < nfd; i++) { |
| const char *event; |
| |
| if (!(pfd[i].revents & POLLIN)) { |
| if (pfd[i].revents == 0) |
| continue; /* this fd has nothing */ |
| |
| /* Likely POLLERR, POLLHUP, POLLNVAL. |
| * Do not listen on this fd anymore. |
| */ |
| close(pfd[i].fd); |
| nfd--; |
| for (; i < nfd; i++) |
| pfd[i].fd = pfd[i + 1].fd; |
| break; /* do poll() again */ |
| } |
| |
| event = NULL; |
| if (option_mask32 & OPT_e) { |
| char *buf; |
| int len; |
| |
| buf = xmalloc_reads(pfd[i].fd, NULL); |
| /* buf = "button/power PWRB 00000080 00000000" */ |
| len = strlen(buf) - 9; |
| if (len >= 0) |
| buf[len] = '\0'; |
| event = find_action(NULL, buf); |
| free(buf); |
| } else { |
| struct input_event ev; |
| |
| if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev))) |
| continue; |
| |
| if (ev.value != 1 && ev.value != 0) |
| continue; |
| |
| event = find_action(&ev, NULL); |
| } |
| if (!event) |
| continue; |
| /* spawn event handler */ |
| process_event(event); |
| } |
| } |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| while (nfd--) |
| close(pfd[nfd].fd); |
| free(pfd); |
| } |
| remove_pidfile(opt_pidfile); |
| |
| return EXIT_SUCCESS; |
| } |