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119 lines
3.9 KiB
119 lines
3.9 KiB
/* rtcwake.c - enter sleep state until given time.
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*
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* Copyright 2020 The Android Open Source Project
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USE_RTCWAKE(NEWTOY(rtcwake, "(list-modes);(auto)a(device)d:(local)l(mode)m:(seconds)s#(time)t#(utc)u(verbose)v[!alu]", TOYFLAG_USR|TOYFLAG_BIN))
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config RTCWAKE
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bool "rtcwake"
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default y
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help
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usage: rtcwake [-aluv] [-d FILE] [-m MODE] [-s SECS] [-t UNIX]
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Enter the given sleep state until the given time.
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-a RTC uses time specified in /etc/adjtime
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-d FILE Device to use (default /dev/rtc)
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-l RTC uses local time
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-m Mode (--list-modes to see those supported by your kernel):
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standby S1: default mem S3: suspend to RAM
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disk S4: suspend to disk off S5: power off
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disable Cancel current alarm freeze stop processes/processors
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no just set wakeup time on just poll RTC for alarm
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show just show current alarm
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-s SECS Wake SECS seconds from now
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-t UNIX Wake UNIX seconds from epoch
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-u RTC uses UTC
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-v Verbose
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*/
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#define FOR_rtcwake
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#include "toys.h"
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#include <linux/rtc.h>
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GLOBALS(
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long t, s;
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char *m, *d;
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)
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void rtcwake_main(void)
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{
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struct rtc_wkalrm *alarm = (void *)(toybuf+2048);
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struct tm rtc_tm;
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time_t now, rtc_now, then;
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int fd, utc;
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if (FLAG(list_modes)) {
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printf("off no on disable show %s",
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xreadfile("/sys/power/state", toybuf, 2048));
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return;
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}
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// util-linux defaults to "suspend", even though I don't have anything that
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// supports that (testing everything from a ~2010 laptop to a 2019 desktop).
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if (!TT.m) TT.m = "suspend";
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if (FLAG(u)) utc = 1;
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else if (FLAG(l)) utc = 0;
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else utc = !readfile("/etc/adjtime", toybuf, 2048) || !!strstr(toybuf, "UTC");
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if (FLAG(v)) xprintf("RTC time: %s\n", utc ? "UTC" : "local");
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if (!TT.d) TT.d = "/dev/rtc0";
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if (FLAG(v)) xprintf("Device: %s\n", TT.d);
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fd = xopen(TT.d, O_RDWR);
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now = time(0);
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xioctl(fd, RTC_RD_TIME, &rtc_tm);
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rtc_now = xmktime(&rtc_tm, utc);
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if (FLAG(v)) {
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xprintf("System time:\t%lld / %s", (long long)now, ctime(&now));
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xprintf("RTC time:\t%lld / %s", (long long)rtc_now, ctime(&rtc_now));
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}
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if (!strcmp(TT.m, "show")) { // Don't suspend, just show current alarm.
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xioctl(fd, RTC_WKALM_RD, alarm);
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if (!alarm->enabled) xputs("alarm: off");
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else {
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if ((then = mktime((void *)&alarm->time)) < 0) perror_exit("mktime");
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xprintf("alarm: on %s", ctime(&then));
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}
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return;
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} else if (!strcmp(TT.m, "disable")) { // Cancel current alarm.
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xioctl(fd, RTC_WKALM_RD, alarm);
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alarm->enabled = 0;
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xioctl(fd, RTC_WKALM_SET, alarm);
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return;
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}
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if (FLAG(s)) then = rtc_now + TT.s + 1; // strace shows util-linux adds 1.
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else if (FLAG(t)) {
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then = TT.t + (rtc_now - now);
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if (then<=rtc_now) error_exit("rtc %lld >= %ld", (long long)rtc_now, TT.t);
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} else help_exit("-m %s needs -s or -t", TT.m);
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if (FLAG(v)) xprintf("Wake time:\t%lld / %s", (long long)then, ctime(&then));
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if (!(utc ? gmtime_r : localtime_r)(&then, (void *)&alarm->time))
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error_exit("%s failed", utc ? "gmtime_r" : "localtime_r");
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alarm->enabled = 1;
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xioctl(fd, RTC_WKALM_SET, alarm);
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sync();
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xprintf("wakeup using \"%s\" from %s at %s", TT.m, TT.d, ctime(&then));
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msleep(10);
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if (!strcmp(TT.m, "no")); // Don't suspend, just set wakeup time.
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else if (!strcmp(TT.m, "on")) { // Don't suspend, poll RTC for alarm.
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unsigned long data = 0;
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if (FLAG(v)) xputs("Reading RTC...");
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while (!(data & RTC_AF)) {
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if (read(fd, &data, sizeof(data)) != sizeof(data)) perror_exit("read");
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if (FLAG(v)) xprintf("... %s: %lx\n", TT.d, data);
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}
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} else if (!strcmp(TT.m, "off")) xexec((char *[]){"poweroff", 0});
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// Everything else lands here for one final step. The write will fail with
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// EINVAL if the mode is not supported.
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else xwrite(xopen("/sys/power/state", O_WRONLY), TT.m, strlen(TT.m));
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}
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