6 files changed, 210 insertions, 2 deletions

diff --git a/docs/busybox.net/news.html b/docs/busybox.net/news.html
index 3fccaae12..5c005fb0e 100644
--- a/docs/busybox.net/news.html
+++ b/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>
diff --git a/include/applets.h b/include/applets.h
index fb904bb9f..ad3925577 100644
--- a/include/applets.h
+++ b/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))
diff --git a/include/usage.h b/include/usage.h
index d35f8ae71..502fea7a0 100644
--- a/include/usage.h
+++ b/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"
diff --git a/util-linux/Config.in b/util-linux/Config.in
index 976507b68..3bba2e26d 100644
--- a/util-linux/Config.in
+++ b/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
diff --git a/util-linux/Kbuild b/util-linux/Kbuild
index 2d0fc4928..842afb756 100644
--- a/util-linux/Kbuild
+++ b/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
diff --git a/util-linux/acpid.c b/util-linux/acpid.c
new file mode 100644
index 000000000..ef4e54d5d
--- /dev/null
+++ b/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;
+}