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/* 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 tarball for details.
*/
#include "libbb.h"
#include <linux/input.h>
#ifndef SW_RFKILL_ALL
# define SW_RFKILL_ALL 3
#endif
/*
* 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 };
// debug info
if (option_mask32 & 8) { // -d
bb_error_msg("%s", 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);
}
/*
* acpid [-c conf_dir] [-l log_file] [-e proc_event_file] [evdev_event_file...]
*/
int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int acpid_main(int argc, char **argv)
{
struct pollfd *pfd;
int i, nfd;
const char *opt_conf = "/etc/acpi";
const char *opt_input = "/proc/acpi/event";
const char *opt_logfile = "/var/log/acpid.log";
getopt32(argv, "c:e:l:d"
IF_FEATURE_ACPID_COMPAT("g:m:s:S:v"),
&opt_conf, &opt_input, &opt_logfile
IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL, NULL)
);
// daemonize unless -d given
if (!(option_mask32 & 8)) { // ! -d
bb_daemonize_or_rexec(0, argv);
close(2);
xopen(opt_logfile, O_WRONLY | O_CREAT | O_TRUNC);
}
argv += optind;
argc -= optind;
// goto configuration directory
xchdir(opt_conf);
// prevent zombies
signal(SIGCHLD, SIG_IGN);
// no explicit evdev files given? -> use proc event interface
if (!*argv) {
// proc_event file is just a "config" :)
char *token[4];
parser_t *parser = config_open(opt_input);
// dispatch events
while (config_read(parser, token, 4, 4, "\0 ", PARSE_NORMAL)) {
char *event = xasprintf("%s/%s", token[1], token[2]);
process_event(event);
free(event);
}
if (ENABLE_FEATURE_CLEAN_UP)
config_close(parser);
return EXIT_SUCCESS;
}
// evdev files given, use evdev interface
// open event devices
pfd = xzalloc(sizeof(*pfd) * argc);
nfd = 0;
while (*argv) {
pfd[nfd].fd = open_or_warn(*argv++, O_RDONLY | O_NONBLOCK);
if (pfd[nfd].fd >= 0)
pfd[nfd++].events = POLLIN;
}
// dispatch events
while (/* !bb_got_signal && */ poll(pfd, nfd, -1) > 0) {
for (i = 0; i < nfd; i++) {
const char *event;
struct input_event ev;
if (!(pfd[i].revents & POLLIN))
continue;
if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev)))
continue;
//bb_info_msg("%d: %d %d %4d", i, ev.type, ev.code, ev.value);
// filter out unneeded events
if (ev.value != 1)
continue;
event = NULL;
// N.B. we will conform to /proc/acpi/event
// naming convention when assigning event names
// TODO: do we want other events?
// power and sleep buttons delivered as keys pressed
if (EV_KEY == ev.type) {
if (KEY_POWER == ev.code)
event = "PWRF/00000080";
else if (KEY_SLEEP == ev.code)
event = "SLPB/00000080";
}
// switches
else if (EV_SW == ev.type) {
if (SW_LID == ev.code)
event = "LID/00000080";
else if (SW_RFKILL_ALL == ev.code)
event = "RFKILL";
}
// filter out unneeded events
if (!event)
continue;
// spawn event handler
process_event(event);
}
}
if (ENABLE_FEATURE_CLEAN_UP) {
for (i = 0; i < nfd; i++)
close(pfd[i].fd);
free(pfd);
}
return EXIT_SUCCESS;
}
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