busybox/util-linux/acpid.c

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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 source tree.
*/
//config:config ACPID
//config: bool "acpid (8.7 kb)"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: acpid listens to ACPI events coming either in textual form from
//config: /proc/acpi/event (though it is marked deprecated it is still widely
//config: used and _is_ a standard) or in binary form from specified evdevs
//config: (just use /dev/input/event*).
//config:
//config: It parses the event to retrieve ACTION and a possible PARAMETER.
//config: It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
//config: (if the resulting path is a directory) or directly as an executable.
//config:
//config: N.B. acpid relies on run-parts so have the latter installed.
//config:
//config:config FEATURE_ACPID_COMPAT
//config: bool "Accept and ignore redundant options"
//config: default y
//config: depends on ACPID
//config: help
//config: Accept and ignore compatibility options -g -m -s -S -v.
//applet:IF_ACPID(APPLET(acpid, BB_DIR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_ACPID) += acpid.o
//usage:#define acpid_trivial_usage
//usage: "[-df] [-c CONFDIR] [-l LOGFILE] [-a ACTIONFILE] [-M MAPFILE] [-e PROC_EVENT_FILE] [-p PIDFILE]"
//usage:#define acpid_full_usage "\n\n"
//usage: "Listen to ACPI events and spawn specific helpers on event arrival\n"
//usage: "\n -d Log to stderr, not log file (implies -f)"
//usage: "\n -f Run in foreground"
//usage: "\n -c DIR Config directory [/etc/acpi]"
//usage: "\n -e FILE /proc event file [/proc/acpi/event]"
//usage: "\n -l FILE Log file [/var/log/acpid.log]"
//usage: "\n -p FILE Pid file [/var/run/acpid.pid]"
//usage: "\n -a FILE Action file [/etc/acpid.conf]"
//usage: "\n -M FILE Map file [/etc/acpi.map]"
//usage: IF_FEATURE_ACPID_COMPAT(
//usage: "\n\nAccept and ignore compatibility options -g -m -s -S -v"
//usage: )
//usage:
//usage:#define acpid_example_usage
//usage: "Without -e option, acpid uses all /dev/input/event* files\n"
//usage: "# acpid\n"
//usage: "# acpid -l /var/log/my-acpi-log\n"
//usage: "# acpid -e /proc/acpi/event\n"
#include "libbb.h"
#include <syslog.h>
#include <linux/input.h>
#ifndef EV_SW
# define EV_SW 0x05
#endif
#ifndef EV_KEY
# define EV_KEY 0x01
#endif
#ifndef SW_LID
# define SW_LID 0x00
#endif
#ifndef SW_RFKILL_ALL
# define SW_RFKILL_ALL 0x03
#endif
#ifndef KEY_POWER
# define KEY_POWER 116 /* SC System Power Down */
#endif
#ifndef KEY_SLEEP
# define KEY_SLEEP 142 /* SC System Sleep */
#endif
enum {
OPT_c = (1 << 0),
OPT_d = (1 << 1),
OPT_e = (1 << 2),
OPT_f = (1 << 3),
OPT_l = (1 << 4),
OPT_a = (1 << 5),
OPT_M = (1 << 6),
OPT_p = (1 << 7) * ENABLE_FEATURE_PIDFILE,
};
struct acpi_event {
const char *s_type;
uint16_t n_type;
const char *s_code;
uint16_t n_code;
uint32_t value;
const char *desc;
};
static const struct acpi_event f_evt_tab[] = {
{ "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRF 00000080" },
{ "EV_KEY", 0x01, "KEY_POWER", 116, 1, "button/power PWRB 00000080" },
{ "EV_SW", 0x05, "SW_LID", 0x00, 1, "button/lid LID0 00000080" },
};
struct acpi_action {
const char *key;
const char *action;
};
static const struct acpi_action f_act_tab[] = {
{ "PWRF", "PWRF/00000080" },
{ "LID0", "LID/00000080" },
};
struct globals {
struct acpi_action *act_tab;
int n_act;
struct acpi_event *evt_tab;
int n_evt;
} FIX_ALIASING;
#define G (*ptr_to_globals)
#define act_tab (G.act_tab)
#define n_act (G.n_act )
#define evt_tab (G.evt_tab)
#define n_evt (G.n_evt )
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)
/*
* 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 };
// log the event
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);
}
static const char *find_action(struct input_event *ev, const char *buf)
{
const char *action = NULL;
int i;
// map event
for (i = 0; i < n_evt; i++) {
if (ev) {
if (ev->type == evt_tab[i].n_type && ev->code == evt_tab[i].n_code && ev->value == evt_tab[i].value) {
action = evt_tab[i].desc;
break;
}
}
if (buf) {
libbb: introduce and use is_prefixed_with() function old new delta is_prefixed_with - 18 +18 complete_username 78 77 -1 man_main 737 735 -2 fsck_device 429 427 -2 unpack_ar_archive 80 76 -4 strip_unsafe_prefix 105 101 -4 singlemount 1054 1050 -4 rtc_adjtime_is_utc 90 86 -4 resolve_mount_spec 88 84 -4 parse_one_line 1029 1025 -4 parse_conf 1460 1456 -4 may_wakeup 83 79 -4 loadkmap_main 219 215 -4 get_irqs_from_stat 103 99 -4 get_header_cpio 913 909 -4 findfs_main 79 75 -4 fbsplash_main 1230 1226 -4 load_crontab 776 771 -5 expand_vars_to_list 1151 1146 -5 date_main 881 876 -5 skip_dev_pfx 30 24 -6 make_device 2199 2193 -6 complete_cmd_dir_file 773 767 -6 run_applet_and_exit 715 708 -7 uudecode_main 321 313 -8 pwdx_main 197 189 -8 execute 568 560 -8 i2cdetect_main 1186 1176 -10 procps_scan 1242 1230 -12 procps_read_smaps 1017 1005 -12 process_module 746 734 -12 patch_main 1903 1891 -12 nfsmount 3572 3560 -12 stack_machine 126 112 -14 process_timer_stats 449 435 -14 match_fstype 111 97 -14 do_ipaddr 1344 1330 -14 open_list_and_close 359 343 -16 get_header_tar 1795 1779 -16 prepend_new_eth_table 340 323 -17 fsck_main 1811 1794 -17 find_iface_state 56 38 -18 dnsd_main 1321 1303 -18 base_device 179 158 -21 find_keyword 104 82 -22 handle_incoming_and_exit 2785 2762 -23 parse_and_put_prompt 774 746 -28 modinfo 347 317 -30 find_action 204 171 -33 update_passwd 1470 1436 -34 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540) Total: -522 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-03-12 22:18:34 +05:30
if (is_prefixed_with(evt_tab[i].desc, buf)) {
action = evt_tab[i].desc;
break;
}
}
}
// get action
if (action) {
for (i = 0; i < n_act; i++) {
if (strstr(action, act_tab[i].key)) {
action = act_tab[i].action;
break;
}
}
}
return action;
}
static void parse_conf_file(const char *filename)
{
parser_t *parser;
char *tokens[2];
parser = config_open2(filename, fopen_for_read);
if (parser) {
while (config_read(parser, tokens, 2, 2, "# \t", PARSE_NORMAL)) {
act_tab = xrealloc_vector(act_tab, 1, n_act);
act_tab[n_act].key = xstrdup(tokens[0]);
act_tab[n_act].action = xstrdup(tokens[1]);
n_act++;
}
config_close(parser);
} else {
act_tab = (void*)f_act_tab;
n_act = ARRAY_SIZE(f_act_tab);
}
}
static void parse_map_file(const char *filename)
{
parser_t *parser;
char *tokens[6];
parser = config_open2(filename, fopen_for_read);
if (parser) {
while (config_read(parser, tokens, 6, 6, "# \t", PARSE_NORMAL)) {
evt_tab = xrealloc_vector(evt_tab, 1, n_evt);
evt_tab[n_evt].s_type = xstrdup(tokens[0]);
evt_tab[n_evt].n_type = xstrtou(tokens[1], 16);
evt_tab[n_evt].s_code = xstrdup(tokens[2]);
evt_tab[n_evt].n_code = xatou16(tokens[3]);
evt_tab[n_evt].value = xatoi_positive(tokens[4]);
evt_tab[n_evt].desc = xstrdup(tokens[5]);
n_evt++;
}
config_close(parser);
} else {
evt_tab = (void*)f_evt_tab;
n_evt = ARRAY_SIZE(f_evt_tab);
}
}
/*
* acpid [-c conf_dir] [-r conf_file ] [-a map_file ] [-l log_file] [-e proc_event_file]
*/
int acpid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int acpid_main(int argc UNUSED_PARAM, char **argv)
{
int nfd;
int opts;
struct pollfd *pfd;
const char *opt_dir = "/etc/acpi";
const char *opt_input = "/dev/input/event";
const char *opt_logfile = "/var/log/acpid.log";
const char *opt_action = "/etc/acpid.conf";
const char *opt_map = "/etc/acpi.map";
#if ENABLE_FEATURE_PIDFILE
const char *opt_pidfile = CONFIG_PID_FILE_PATH "/acpid.pid";
#endif
INIT_G();
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
opts = getopt32(argv, "^"
"c:de:fl:a:M:"
IF_FEATURE_PIDFILE("p:")
IF_FEATURE_ACPID_COMPAT("g:m:s:S:v")
"\0"
"df:e--e",
&opt_dir, &opt_input, &opt_logfile, &opt_action, &opt_map
IF_FEATURE_PIDFILE(, &opt_pidfile)
IF_FEATURE_ACPID_COMPAT(, NULL, NULL, NULL, NULL)
);
if (!(opts & OPT_f)) {
/* No -f "Foreground", we go to background */
bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
}
if (!(opts & OPT_d)) {
/* No -d "Debug", we log to log file.
* This includes any output from children.
*/
xmove_fd(xopen(opt_logfile, O_WRONLY | O_CREAT | O_APPEND), STDOUT_FILENO);
xdup2(STDOUT_FILENO, STDERR_FILENO);
/* Also, acpid's messages (but not children) will go to syslog too */
openlog(applet_name, LOG_PID, LOG_DAEMON);
logmode = LOGMODE_SYSLOG | LOGMODE_STDIO;
}
/* else: -d "Debug", log is not redirected */
parse_conf_file(opt_action);
parse_map_file(opt_map);
xchdir(opt_dir);
/* We spawn children but don't wait for them. Prevent zombies: */
bb_signals((1 << SIGCHLD), SIG_IGN);
// If you enable this, (1) explain why, (2)
// make sure while(poll) loop below is still interruptible
// by SIGTERM et al:
//bb_signals(BB_FATAL_SIGS, record_signo);
pfd = NULL;
nfd = 0;
while (1) {
int fd;
char *dev_event;
dev_event = xasprintf((opts & OPT_e) ? "%s" : "%s%u", opt_input, nfd);
fd = open(dev_event, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
if (nfd == 0)
bb_simple_perror_msg_and_die(dev_event);
break;
}
free(dev_event);
pfd = xrealloc_vector(pfd, 1, nfd);
pfd[nfd].fd = fd;
pfd[nfd].events = POLLIN;
nfd++;
}
write_pidfile(opt_pidfile);
while (safe_poll(pfd, nfd, -1) > 0) {
int i;
for (i = 0; i < nfd; i++) {
const char *event;
if (!(pfd[i].revents & POLLIN)) {
if (pfd[i].revents == 0)
continue; /* this fd has nothing */
/* Likely POLLERR, POLLHUP, POLLNVAL.
* Do not listen on this fd anymore.
*/
close(pfd[i].fd);
nfd--;
for (; i < nfd; i++)
pfd[i].fd = pfd[i + 1].fd;
break; /* do poll() again */
}
event = NULL;
if (option_mask32 & OPT_e) {
char *buf;
int len;
buf = xmalloc_reads(pfd[i].fd, NULL);
/* buf = "button/power PWRB 00000080 00000000" */
len = strlen(buf) - 9;
if (len >= 0)
buf[len] = '\0';
event = find_action(NULL, buf);
free(buf);
} else {
struct input_event ev;
if (sizeof(ev) != full_read(pfd[i].fd, &ev, sizeof(ev)))
continue;
if (ev.value != 1 && ev.value != 0)
continue;
event = find_action(&ev, NULL);
}
if (!event)
continue;
/* spawn event handler */
process_event(event);
}
}
if (ENABLE_FEATURE_CLEAN_UP) {
while (nfd--)
close(pfd[nfd].fd);
free(pfd);
}
remove_pidfile(opt_pidfile);
return EXIT_SUCCESS;
}