busybox/util-linux/rtcwake.c

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/*
* rtcwake -- enter a system sleep state until specified wakeup time.
*
* This version was taken from util-linux and scrubbed down for busybox.
*
* Licensed under GPLv2, see file LICENSE in this source tree.
2008-12-07 06:22:58 +05:30
*
* This uses cross-platform Linux interfaces to enter a system sleep state,
* and leave it no later than a specified time. It uses any RTC framework
* driver that supports standard driver model wakeup flags.
*
* This is normally used like the old "apmsleep" utility, to wake from a
* suspend state like ACPI S1 (standby) or S3 (suspend-to-RAM). Most
* platforms can implement those without analogues of BIOS, APM, or ACPI.
*
* On some systems, this can also be used like "nvram-wakeup", waking
* from states like ACPI S4 (suspend to disk). Not all systems have
* persistent media that are appropriate for such suspend modes.
*
* The best way to set the system's RTC is so that it holds the current
* time in UTC. Use the "-l" flag to tell this program that the system
* RTC uses a local timezone instead (maybe you dual-boot MS-Windows).
* That flag should not be needed on systems with adjtime support.
*/
//config:config RTCWAKE
//config: bool "rtcwake (6.4 kb)"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: Enter a system sleep state until specified wakeup time.
//applet:IF_RTCWAKE(APPLET(rtcwake, BB_DIR_USR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_RTCWAKE) += rtcwake.o
//usage:#define rtcwake_trivial_usage
//usage: "[-a | -l | -u] [-d DEV] [-m MODE] [-s SEC | -t TIME]"
//usage:#define rtcwake_full_usage "\n\n"
//usage: "Enter a system sleep state until specified wakeup time\n"
//usage: IF_LONG_OPTS(
//usage: "\n -a,--auto Read clock mode from adjtime"
//usage: "\n -l,--local Clock is set to local time"
//usage: "\n -u,--utc Clock is set to UTC time"
//usage: "\n -d,--device DEV Specify the RTC device"
//usage: "\n -m,--mode MODE Set sleep state (default: standby)"
//usage: "\n -s,--seconds SEC Set timeout in SEC seconds from now"
//usage: "\n -t,--time TIME Set timeout to TIME seconds from epoch"
//usage: )
//usage: IF_NOT_LONG_OPTS(
//usage: "\n -a Read clock mode from adjtime"
//usage: "\n -l Clock is set to local time"
//usage: "\n -u Clock is set to UTC time"
//usage: "\n -d DEV Specify the RTC device"
//usage: "\n -m MODE Set sleep state (default: standby)"
//usage: "\n -s SEC Set timeout in SEC seconds from now"
//usage: "\n -t TIME Set timeout to TIME seconds from epoch"
//usage: )
#include "libbb.h"
#include "rtc_.h"
#define SYS_RTC_PATH "/sys/class/rtc/%s/device/power/wakeup"
#define SYS_POWER_PATH "/sys/power/state"
static NOINLINE bool may_wakeup(const char *rtcname)
{
ssize_t ret;
char buf[128];
/* strip "/dev/" from the rtcname here */
rtcname = skip_dev_pfx(rtcname);
snprintf(buf, sizeof(buf), SYS_RTC_PATH, rtcname);
ret = open_read_close(buf, buf, sizeof(buf));
if (ret < 0)
return false;
/* wakeup events could be disabled or not supported */
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
return is_prefixed_with(buf, "enabled\n") != NULL;
}
static NOINLINE void setup_alarm(int fd, time_t *wakeup, time_t rtc_time)
{
struct tm *ptm;
struct linux_rtc_wkalrm wake;
/* The wakeup time is in POSIX time (more or less UTC).
* Ideally RTCs use that same time; but PCs can't do that
* if they need to boot MS-Windows. Messy...
*
* When running in utc mode this process's timezone is UTC,
* so we'll pass a UTC date to the RTC.
*
* Else mode is local so the time given to the RTC
* will instead use the local time zone.
*/
ptm = localtime(wakeup);
wake.time.tm_sec = ptm->tm_sec;
wake.time.tm_min = ptm->tm_min;
wake.time.tm_hour = ptm->tm_hour;
wake.time.tm_mday = ptm->tm_mday;
wake.time.tm_mon = ptm->tm_mon;
wake.time.tm_year = ptm->tm_year;
/* wday, yday, and isdst fields are unused by Linux */
wake.time.tm_wday = -1;
wake.time.tm_yday = -1;
wake.time.tm_isdst = -1;
/* many rtc alarms only support up to 24 hours from 'now',
* so use the "more than 24 hours" request only if we must
*/
if ((rtc_time + (24 * 60 * 60)) > *wakeup) {
xioctl(fd, RTC_ALM_SET, &wake.time);
xioctl(fd, RTC_AIE_ON, 0);
} else {
/* avoid an extra AIE_ON call */
wake.enabled = 1;
xioctl(fd, RTC_WKALM_SET, &wake);
}
}
#define RTCWAKE_OPT_AUTO 0x01
#define RTCWAKE_OPT_LOCAL 0x02
#define RTCWAKE_OPT_UTC 0x04
#define RTCWAKE_OPT_DEVICE 0x08
#define RTCWAKE_OPT_SUSPEND_MODE 0x10
#define RTCWAKE_OPT_SECONDS 0x20
#define RTCWAKE_OPT_TIME 0x40
int rtcwake_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2008-07-05 14:48:54 +05:30
int rtcwake_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opt;
const char *rtcname = NULL;
const char *suspend = "standby";
const char *opt_seconds;
const char *opt_time;
time_t rtc_time;
time_t sys_time;
time_t alarm_time = alarm_time;
unsigned seconds = seconds; /* for compiler */
int utc = -1;
int fd;
#if ENABLE_LONG_OPTS
static const char rtcwake_longopts[] ALIGN1 =
"auto\0" No_argument "a"
"local\0" No_argument "l"
"utc\0" No_argument "u"
"device\0" Required_argument "d"
"mode\0" Required_argument "m"
"seconds\0" Required_argument "s"
"time\0" Required_argument "t"
;
#endif
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
opt = getopt32long(argv,
/* Must have -s or -t, exclusive */
"^alud:m:s:t:" "\0" "s:t:s--t:t--s", rtcwake_longopts,
getopt32: remove applet_long_options FEATURE_GETOPT_LONG made dependent on LONG_OPTS. The folloving options are removed, now LONG_OPTS enables long options for affected applets: FEATURE_ENV_LONG_OPTIONS FEATURE_EXPAND_LONG_OPTIONS FEATURE_UNEXPAND_LONG_OPTIONS FEATURE_MKDIR_LONG_OPTIONS FEATURE_MV_LONG_OPTIONS FEATURE_RMDIR_LONG_OPTIONS FEATURE_ADDGROUP_LONG_OPTIONS FEATURE_ADDUSER_LONG_OPTIONS FEATURE_HWCLOCK_LONG_OPTIONS FEATURE_NSENTER_LONG_OPTS FEATURE_CHCON_LONG_OPTIONS FEATURE_RUNCON_LONG_OPTIONS They either had a small number of long options, or their long options are essential. Example: upstream addgroup and adduser have ONLY longopts, we should probably go further and get rid of non-standard short options. To this end, make addgroup and adduser "select LONG_OPTS". We had this breakage caused by us even in our own package! #if ENABLE_LONG_OPTS || !ENABLE_ADDGROUP /* We try to use --gid, not -g, because "standard" addgroup * has no short option -g, it has only long --gid. */ argv[1] = (char*)"--gid"; #else /* Breaks if system in fact does NOT use busybox addgroup */ argv[1] = (char*)"-g"; #endif xargs: its lone longopt no longer depends on DESKTOP, only on LONG_OPTS. hwclock TODO: get rid of incompatible -t, -l aliases to --systz, --localtime Shorten help texts by omitting long option when short opt alternative exists. Reduction of size comes from the fact that store of an immediate (an address of longopts) to a fixed address (global variable) is a longer insn than pushing that immediate or passing it in a register. This effect is CPU-agnostic. function old new delta getopt32 1350 22 -1328 vgetopt32 - 1318 +1318 getopt32long - 24 +24 tftpd_main 562 567 +5 scan_recursive 376 380 +4 collect_cpu 545 546 +1 date_main 1096 1095 -1 hostname_main 262 259 -3 uname_main 259 255 -4 setpriv_main 362 358 -4 rmdir_main 191 187 -4 mv_main 562 558 -4 ipcalc_main 548 544 -4 ifenslave_main 641 637 -4 gzip_main 192 188 -4 gunzip_main 77 73 -4 fsfreeze_main 81 77 -4 flock_main 318 314 -4 deluser_main 337 333 -4 cp_main 374 370 -4 chown_main 175 171 -4 applet_long_options 4 - -4 xargs_main 894 889 -5 wget_main 2540 2535 -5 udhcpc_main 2767 2762 -5 touch_main 436 431 -5 tar_main 1014 1009 -5 start_stop_daemon_main 1033 1028 -5 sed_main 682 677 -5 script_main 1082 1077 -5 run_parts_main 330 325 -5 rtcwake_main 459 454 -5 od_main 2169 2164 -5 nl_main 201 196 -5 modprobe_main 773 768 -5 mkdir_main 160 155 -5 ls_main 568 563 -5 install_main 773 768 -5 hwclock_main 411 406 -5 getopt_main 622 617 -5 fstrim_main 256 251 -5 env_main 198 193 -5 dumpleases_main 635 630 -5 dpkg_main 3991 3986 -5 diff_main 1355 1350 -5 cryptpw_main 233 228 -5 cpio_main 593 588 -5 conspy_main 1135 1130 -5 chpasswd_main 313 308 -5 adduser_main 887 882 -5 addgroup_main 416 411 -5 ftpgetput_main 351 345 -6 get_terminal_width_height 242 234 -8 expand_main 690 680 -10 static.expand_longopts 18 - -18 static.unexpand_longopts 27 - -27 mkdir_longopts 28 - -28 env_longopts 30 - -30 static.ifenslave_longopts 34 - -34 mv_longopts 46 - -46 static.rmdir_longopts 48 - -48 packed_usage 31739 31687 -52 ------------------------------------------------------------------------------ (add/remove: 2/8 grow/shrink: 3/49 up/down: 1352/-1840) Total: -488 bytes text data bss dec hex filename 915681 485 6880 923046 e15a6 busybox_old 915428 485 6876 922789 e14a5 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-08 20:08:18 +05:30
&rtcname, &suspend, &opt_seconds, &opt_time);
/* this is the default
if (opt & RTCWAKE_OPT_AUTO)
utc = -1;
*/
if (opt & (RTCWAKE_OPT_UTC | RTCWAKE_OPT_LOCAL))
utc = opt & RTCWAKE_OPT_UTC;
if (opt & RTCWAKE_OPT_SECONDS) {
/* alarm time, seconds-to-sleep (relative) */
seconds = xatou(opt_seconds);
} else {
/* RTCWAKE_OPT_TIME */
/* alarm time, time_t (absolute, seconds since 1/1 1970 UTC) */
if (sizeof(alarm_time) <= sizeof(long))
alarm_time = xatol(opt_time);
else
alarm_time = xatoll(opt_time);
}
if (utc == -1)
utc = rtc_adjtime_is_utc();
/* the rtcname is relative to /dev */
xchdir("/dev");
/* this RTC must exist and (if we'll sleep) be wakeup-enabled */
fd = rtc_xopen(&rtcname, O_RDONLY);
if (strcmp(suspend, "on") != 0)
if (!may_wakeup(rtcname))
bb_error_msg_and_die("%s not enabled for wakeup events", rtcname);
/* relative or absolute alarm time, normalized to time_t */
sys_time = time(NULL);
{
struct tm tm_time;
rtc_read_tm(&tm_time, fd);
rtc_time = rtc_tm2time(&tm_time, utc);
}
if (opt & RTCWAKE_OPT_TIME) {
/* Correct for RTC<->system clock difference */
alarm_time += rtc_time - sys_time;
if (alarm_time < rtc_time)
/*
* Compat message text.
* I'd say "RTC time is already ahead of ..." instead.
*/
bb_error_msg_and_die("time doesn't go backward to %s", ctime(&alarm_time));
} else
alarm_time = rtc_time + seconds + 1;
setup_alarm(fd, &alarm_time, rtc_time);
sync();
#if 0 /*debug*/
printf("sys_time: %s", ctime(&sys_time));
printf("rtc_time: %s", ctime(&rtc_time));
#endif
printf("wakeup from \"%s\" at %s", suspend, ctime(&alarm_time));
fflush_all();
usleep(10 * 1000);
if (strcmp(suspend, "on") != 0)
xopen_xwrite_close(SYS_POWER_PATH, suspend);
else {
/* "fake" suspend ... we'll do the delay ourselves */
unsigned long data;
do {
ssize_t ret = safe_read(fd, &data, sizeof(data));
if (ret < 0) {
bb_perror_msg("rtc read");
break;
}
} while (!(data & RTC_AF));
}
xioctl(fd, RTC_AIE_OFF, 0);
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
return EXIT_SUCCESS;
}