*
* This version was taken from util-linux and scrubbed down for busybox.
*
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ *
* 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.
* 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"
-#define DEFAULT_MODE "suspend"
-
-static time_t rtc_time;
-static bool may_wakeup(const char *rtcname)
+static NOINLINE bool may_wakeup(const char *rtcname)
{
ssize_t ret;
char buf[128];
- /* strip the '/dev/' from the rtcname here */
- if (!strncmp(rtcname, "/dev/", 5))
- rtcname += 5;
+ /* 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));
return false;
/* wakeup events could be disabled or not supported */
- return strncmp(buf, "enabled\n", 8) == 0;
+ return is_prefixed_with(buf, "enabled\n") != NULL;
}
-static void setup_alarm(int fd, time_t *wakeup)
+static NOINLINE void setup_alarm(int fd, time_t *wakeup, time_t rtc_time)
{
- struct tm *tm;
- struct linux_rtc_wkalrm wake;
+ 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
* Else mode is local so the time given to the RTC
* will instead use the local time zone.
*/
- tm = localtime(wakeup);
-
- wake.time.tm_sec = tm->tm_sec;
- wake.time.tm_min = tm->tm_min;
- wake.time.tm_hour = tm->tm_hour;
- wake.time.tm_mday = tm->tm_mday;
- wake.time.tm_mon = tm->tm_mon;
- wake.time.tm_year = tm->tm_year;
+ 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;
#define RTCWAKE_OPT_TIME 0x40
int rtcwake_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int rtcwake_main(int argc ATTRIBUTE_UNUSED, char **argv)
+int rtcwake_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opt;
const char *rtcname = NULL;
- const char *suspend;
+ const char *suspend = "standby";
const char *opt_seconds;
const char *opt_time;
+ time_t rtc_time;
time_t sys_time;
- time_t alarm_time = 0;
- unsigned seconds = 0;
+ time_t alarm_time = alarm_time;
+ unsigned seconds = seconds; /* for compiler */
int utc = -1;
int fd;
-#if ENABLE_GETOPT_LONG
+#if ENABLE_LONG_OPTS
static const char rtcwake_longopts[] ALIGN1 =
"auto\0" No_argument "a"
"local\0" No_argument "l"
"seconds\0" Required_argument "s"
"time\0" Required_argument "t"
;
- applet_long_options = rtcwake_longopts;
#endif
- opt = getopt32(argv, "alud:m:s:t:", &rtcname, &suspend, &opt_seconds, &opt_time);
+ opt = getopt32long(argv,
+ /* Must have -s or -t, exclusive */
+ "^alud:m:s:t:" "\0" "s:t:s--t:t--s", rtcwake_longopts,
+ &rtcname, &suspend, &opt_seconds, &opt_time);
/* this is the default
if (opt & RTCWAKE_OPT_AUTO)
*/
if (opt & (RTCWAKE_OPT_UTC | RTCWAKE_OPT_LOCAL))
utc = opt & RTCWAKE_OPT_UTC;
- if (!(opt & RTCWAKE_OPT_SUSPEND_MODE))
- suspend = DEFAULT_MODE;
- if (opt & RTCWAKE_OPT_SECONDS)
+ if (opt & RTCWAKE_OPT_SECONDS) {
/* alarm time, seconds-to-sleep (relative) */
- seconds = xatoi(opt_seconds);
- if (opt & RTCWAKE_OPT_TIME)
+ seconds = xatou(opt_seconds);
+ } else {
+ /* RTCWAKE_OPT_TIME */
/* alarm time, time_t (absolute, seconds since 1/1 1970 UTC) */
- alarm_time = xatoi(opt_time);
-
- if (!alarm_time && !seconds)
- bb_error_msg_and_die("must provide wake time");
+ 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();
/* this RTC must exist and (if we'll sleep) be wakeup-enabled */
fd = rtc_xopen(&rtcname, O_RDONLY);
- if (strcmp(suspend, "on") && !may_wakeup(rtcname))
- bb_error_msg_and_die("%s not enabled for wakeup events", rtcname);
+ 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(0);
- if (sys_time == (time_t)-1)
- bb_perror_msg_and_die("read system time");
- rtc_time = rtc_read_time(fd, utc);
+ sys_time = time(NULL);
+ {
+ struct tm tm_time;
+ rtc_read_tm(&tm_time, fd);
+ rtc_time = rtc_tm2time(&tm_time, utc);
+ }
- if (alarm_time) {
- if (alarm_time < sys_time)
+ 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));
- alarm_time += sys_time - rtc_time;
} else
alarm_time = rtc_time + seconds + 1;
- setup_alarm(fd, &alarm_time);
+ 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(stdout);
+ fflush_all();
usleep(10 * 1000);
- if (strcmp(suspend, "on"))
+ if (strcmp(suspend, "on") != 0)
xopen_xwrite_close(SYS_POWER_PATH, suspend);
else {
/* "fake" suspend ... we'll do the delay ourselves */
projects / oweals / busybox.git / blobdiff