Contents of /trunk/mkinitrd-magellan/busybox/util-linux/acpid.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 4430 byte(s)
-updated to busybox-1.17.1
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * simple ACPI events listener |
4 | * |
5 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com> |
6 | * |
7 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
8 | */ |
9 | #include "libbb.h" |
10 | |
11 | #include <linux/input.h> |
12 | #ifndef EV_SW |
13 | # define EV_SW 0x05 |
14 | #endif |
15 | #ifndef EV_KEY |
16 | # define EV_KEY 0x01 |
17 | #endif |
18 | #ifndef SW_LID |
19 | # define SW_LID 0x00 |
20 | #endif |
21 | #ifndef SW_RFKILL_ALL |
22 | # define SW_RFKILL_ALL 0x03 |
23 | #endif |
24 | #ifndef KEY_POWER |
25 | # define KEY_POWER 116 /* SC System Power Down */ |
26 | #endif |
27 | #ifndef KEY_SLEEP |
28 | # define KEY_SLEEP 142 /* SC System Sleep */ |
29 | #endif |
30 | |
31 | |
32 | /* |
33 | * acpid listens to ACPI events coming either in textual form |
34 | * from /proc/acpi/event (though it is marked deprecated, |
35 | * it is still widely used and _is_ a standard) or in binary form |
36 | * from specified evdevs (just use /dev/input/event*). |
37 | * It parses the event to retrieve ACTION and a possible PARAMETER. |
38 | * It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts |
39 | * (if the resulting path is a directory) or directly. |
40 | * If the resulting path does not exist it logs it via perror |
41 | * and continues listening. |
42 | */ |
43 | |
44 | static void process_event(const char *event) |
45 | { |
46 | struct stat st; |
47 | char *handler = xasprintf("./%s", event); |
48 | const char *args[] = { "run-parts", handler, NULL }; |
49 | |
50 | // debug info |
51 | if (option_mask32 & 8) { // -d |
52 | bb_error_msg("%s", event); |
53 | } |
54 | |
55 | // spawn handler |
56 | // N.B. run-parts would require scripts to have #!/bin/sh |
57 | // handler is directory? -> use run-parts |
58 | // handler is file? -> run it directly |
59 | if (0 == stat(event, &st)) |
60 | spawn((char **)args + (0==(st.st_mode & S_IFDIR))); |
61 | else |
62 | bb_simple_perror_msg(event); |
63 | free(handler); |
64 | } |
65 | |
66 | /* |
67 | * acpid [-c conf_dir] [-l log_file] [-e proc_event_file] [evdev_event_file...] |
68 | */ |
69 | |
70 | int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
71 | int acpid_main(int argc, char **argv) |
72 | { |
73 | struct pollfd *pfd; |
74 | int i, nfd; |
75 | const char *opt_conf = "/etc/acpi"; |
76 | const char *opt_input = "/proc/acpi/event"; |
77 | const char *opt_logfile = "/var/log/acpid.log"; |
78 | |
79 | getopt32(argv, "c:e:l:d" |
80 | IF_FEATURE_ACPID_COMPAT("g:m:s:S:v"), |
81 | &opt_conf, &opt_input, &opt_logfile |
82 | IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL, NULL) |
83 | ); |
84 | |
85 | // daemonize unless -d given |
86 | if (!(option_mask32 & 8)) { // ! -d |
87 | bb_daemonize_or_rexec(0, argv); |
88 | close(2); |
89 | xopen(opt_logfile, O_WRONLY | O_CREAT | O_TRUNC); |
90 | } |
91 | |
92 | argv += optind; |
93 | argc -= optind; |
94 | |
95 | // goto configuration directory |
96 | xchdir(opt_conf); |
97 | |
98 | // prevent zombies |
99 | signal(SIGCHLD, SIG_IGN); |
100 | |
101 | // no explicit evdev files given? -> use proc event interface |
102 | if (!*argv) { |
103 | // proc_event file is just a "config" :) |
104 | char *token[4]; |
105 | parser_t *parser = config_open(opt_input); |
106 | |
107 | // dispatch events |
108 | while (config_read(parser, token, 4, 4, "\0 ", PARSE_NORMAL)) { |
109 | char *event = xasprintf("%s/%s", token[1], token[2]); |
110 | process_event(event); |
111 | free(event); |
112 | } |
113 | |
114 | if (ENABLE_FEATURE_CLEAN_UP) |
115 | config_close(parser); |
116 | return EXIT_SUCCESS; |
117 | } |
118 | |
119 | // evdev files given, use evdev interface |
120 | |
121 | // open event devices |
122 | pfd = xzalloc(sizeof(*pfd) * argc); |
123 | nfd = 0; |
124 | while (*argv) { |
125 | pfd[nfd].fd = open_or_warn(*argv++, O_RDONLY | O_NONBLOCK); |
126 | if (pfd[nfd].fd >= 0) |
127 | pfd[nfd++].events = POLLIN; |
128 | } |
129 | |
130 | // dispatch events |
131 | while (/* !bb_got_signal && */ poll(pfd, nfd, -1) > 0) { |
132 | for (i = 0; i < nfd; i++) { |
133 | const char *event; |
134 | struct input_event ev; |
135 | |
136 | if (!(pfd[i].revents & POLLIN)) |
137 | continue; |
138 | |
139 | if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev))) |
140 | continue; |
141 | //bb_info_msg("%d: %d %d %4d", i, ev.type, ev.code, ev.value); |
142 | |
143 | // filter out unneeded events |
144 | if (ev.value != 1) |
145 | continue; |
146 | |
147 | event = NULL; |
148 | |
149 | // N.B. we will conform to /proc/acpi/event |
150 | // naming convention when assigning event names |
151 | |
152 | // TODO: do we want other events? |
153 | |
154 | // power and sleep buttons delivered as keys pressed |
155 | if (EV_KEY == ev.type) { |
156 | if (KEY_POWER == ev.code) |
157 | event = "PWRF/00000080"; |
158 | else if (KEY_SLEEP == ev.code) |
159 | event = "SLPB/00000080"; |
160 | } |
161 | // switches |
162 | else if (EV_SW == ev.type) { |
163 | if (SW_LID == ev.code) |
164 | event = "LID/00000080"; |
165 | else if (SW_RFKILL_ALL == ev.code) |
166 | event = "RFKILL"; |
167 | } |
168 | // filter out unneeded events |
169 | if (!event) |
170 | continue; |
171 | |
172 | // spawn event handler |
173 | process_event(event); |
174 | } |
175 | } |
176 | |
177 | if (ENABLE_FEATURE_CLEAN_UP) { |
178 | for (i = 0; i < nfd; i++) |
179 | close(pfd[i].fd); |
180 | free(pfd); |
181 | } |
182 | |
183 | return EXIT_SUCCESS; |
184 | } |