acpid: new applet by Vladimir. +737 bytes

docs/busybox.net/news.html

@@ -32,8 +32,8 @@
     <a href="http://busybox.net/downloads/fixes-1.12.3/">patches</a>,
     <a href="http://busybox.net/fix.html">how to add a patch</a>)</p>
 
-    <p>Bug-fix releases. 1.13.1 has fixes for ash, option parsing, id, init,
-    inotify, klogd, line editing and modprobe. 1.12.3 has fixes
+    <p>Bug fix releases. 1.13.1 has fixes for ash, option parsing, id, init,
+    inotifyd, klogd, line editing and modprobe. 1.12.3 has fixes
     for option parsing and line editing.
     </p>
   </li>

include/applets.h

@@ -69,6 +69,7 @@ s     - suid type:
 
 USE_TEST(APPLET_NOFORK([,  test, _BB_DIR_USR_BIN, _BB_SUID_NEVER, test))
 USE_TEST(APPLET_NOFORK([[, test, _BB_DIR_USR_BIN, _BB_SUID_NEVER, test))
+USE_ACPID(APPLET(acpid, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_ADDGROUP(APPLET(addgroup, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_ADDUSER(APPLET(adduser, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_ADJTIMEX(APPLET(adjtimex, _BB_DIR_SBIN, _BB_SUID_NEVER))

include/usage.h

@@ -16,6 +16,23 @@
 
 #define NOUSAGE_STR "\b"
 
+#define acpid_trivial_usage \
+       "[-d] [-c CONFDIR] [-l LOGFILE] [-e PROC_EVENT_FILE] [EVDEV_EVENT_FILE...]"
+
+#define acpid_full_usage "\n\n" \
+       "Listen to ACPI events and spawn specific helpers on event arrival\n" \
+     "\nOptions:" \
+     "\n	-d	Do not daemonize and log to stderr" \
+     "\n	-c DIR	Config directory [/etc/acpi]" \
+     "\n	-e FILE	/proc event file [/proc/acpi/event]" \
+     "\n	-l FILE	Log file [/var/log/acpid]" \
+	USE_FEATURE_ACPID_COMPAT( \
+     "\n\nAccept and ignore compatibility options -g -m -s -S -v" \
+	)
+
+#define acpid_example_usage \
+       "# acpid -l /var/log/my-acpi-log\n" \
+       "# acpid -d /dev/input/event*\n"
 
 #define addgroup_trivial_usage \
        "[-g GID] " USE_FEATURE_ADDUSER_TO_GROUP("[user_name] ") "group_name"

util-linux/Config.in

@@ -5,6 +5,28 @@
 
 menu "Linux System Utilities"
 
+config ACPID
+	bool "acpid"
+	default n
+	help
+	  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 as an executable.
+
+	  N.B. acpid relies on run-parts so have the latter installed.
+
+config FEATURE_ACPID_COMPAT
+	bool "Accept and ignore redundant options"
+	default n
+	depends on ACPID
+	help
+	  Accept and ignore compatibility options -g -m -s -S -v.
+
 config BLKID
 	bool "blkid"
 	default n

util-linux/Kbuild

@@ -5,6 +5,7 @@
 # Licensed under the GPL v2, see the file LICENSE in this tarball.
 
 lib-y:=
+lib-$(CONFIG_ACPID)             += acpid.o
 lib-$(CONFIG_BLKID)             += blkid.o
 lib-$(CONFIG_DMESG)             += dmesg.o
 lib-$(CONFIG_FBSET)             += fbset.o

util-linux/acpid.c

@@ -0,0 +1,167 @@
+/* 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"
+		USE_FEATURE_ACPID_COMPAT("g:m:s:S:v"),
+		&opt_conf, &opt_input, &opt_logfile
+		USE_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;
+
+	// goto configuration directory
+	xchdir(opt_conf);
+
+//	// setup signals
+//	bb_signals(BB_FATAL_SIGS, record_signo);
+
+	// 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 - optind));
+	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;
+}