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 tarball for details.
11 #include <linux/input.h>
13 # define SW_RFKILL_ALL 3
17 * acpid listens to ACPI events coming either in textual form
18 * from /proc/acpi/event (though it is marked deprecated,
19 * it is still widely used and _is_ a standard) or in binary form
20 * from specified evdevs (just use /dev/input/event*).
21 * It parses the event to retrieve ACTION and a possible PARAMETER.
22 * It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
23 * (if the resulting path is a directory) or directly.
24 * If the resulting path does not exist it logs it via perror
25 * and continues listening.
28 static void process_event(const char *event)
31 char *handler = xasprintf("./%s", event);
32 const char *args[] = { "run-parts", handler, NULL };
35 if (option_mask32 & 8) { // -d
36 bb_error_msg("%s", event);
40 // N.B. run-parts would require scripts to have #!/bin/sh
41 // handler is directory? -> use run-parts
42 // handler is file? -> run it directly
43 if (0 == stat(event, &st))
44 spawn((char **)args + (0==(st.st_mode & S_IFDIR)));
46 bb_simple_perror_msg(event);
51 * acpid [-c conf_dir] [-l log_file] [-e proc_event_file] [evdev_event_file...]
54 int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
55 int acpid_main(int argc, char **argv)
59 const char *opt_conf = "/etc/acpi";
60 const char *opt_input = "/proc/acpi/event";
61 const char *opt_logfile = "/var/log/acpid.log";
63 getopt32(argv, "c:e:l:d"
64 IF_FEATURE_ACPID_COMPAT("g:m:s:S:v"),
65 &opt_conf, &opt_input, &opt_logfile
66 IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL, NULL)
69 // daemonize unless -d given
70 if (!(option_mask32 & 8)) { // ! -d
71 bb_daemonize_or_rexec(0, argv);
73 xopen(opt_logfile, O_WRONLY | O_CREAT | O_TRUNC);
78 // goto configuration directory
82 signal(SIGCHLD, SIG_IGN);
84 // no explicit evdev files given? -> use proc event interface
86 // proc_event file is just a "config" :)
88 parser_t *parser = config_open(opt_input);
91 while (config_read(parser, token, 4, 4, "\0 ", PARSE_NORMAL)) {
92 char *event = xasprintf("%s/%s", token[1], token[2]);
97 if (ENABLE_FEATURE_CLEAN_UP)
102 // evdev files given, use evdev interface
104 // open event devices
105 pfd = xzalloc(sizeof(*pfd) * (argc - optind));
108 pfd[nfd].fd = open_or_warn(*argv++, O_RDONLY | O_NONBLOCK);
109 if (pfd[nfd].fd >= 0)
110 pfd[nfd++].events = POLLIN;
114 while (/* !bb_got_signal && */ poll(pfd, nfd, -1) > 0) {
115 for (i = 0; i < nfd; i++) {
117 struct input_event ev;
119 if (!(pfd[i].revents & POLLIN))
122 if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev)))
124 //bb_info_msg("%d: %d %d %4d", i, ev.type, ev.code, ev.value);
126 // filter out unneeded events
132 // N.B. we will conform to /proc/acpi/event
133 // naming convention when assigning event names
135 // TODO: do we want other events?
137 // power and sleep buttons delivered as keys pressed
138 if (EV_KEY == ev.type) {
139 if (KEY_POWER == ev.code)
140 event = "PWRF/00000080";
141 else if (KEY_SLEEP == ev.code)
142 event = "SLPB/00000080";
145 else if (EV_SW == ev.type) {
146 if (SW_LID == ev.code)
147 event = "LID/00000080";
148 else if (SW_RFKILL_ALL == ev.code)
151 // filter out unneeded events
155 // spawn event handler
156 process_event(event);
160 if (ENABLE_FEATURE_CLEAN_UP) {
161 for (i = 0; i < nfd; i++)