* Karel Zak <kzak@xxxxxxxxxx> [2007-07-05 23:59]:
> On Thu, Jul 05, 2007 at 04:44:25PM +0200, Bernhard Walle wrote:
> > Hi,
> >
> > wouldn't it make sense to include the wakeup tool from kernel commit
> > k87ac84f42a7a580d0dd72ae31d6a5eb4bfe04c6d [1] to util-linux?
>
> Send patch ;-)
See below. I can write a manual page and adjust the program to read
utc/localtime from /etc/adjtime, but it makes no sense to do the
effort if you don't want such a program in utils-linux-ng.
---
misc-utils/Makefile.am | 2
misc-utils/wakeup.c | 379 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 380 insertions(+), 1 deletion(-)
--- a/misc-utils/Makefile.am
+++ b/misc-utils/Makefile.am
@@ -5,7 +5,7 @@ EXTRA_DIST = README.flushb
bin_PROGRAMS =
usrbinexec_PROGRAMS = cal ddate logger look mcookie \
- namei script whereis
+ namei script whereis wakeup
EXTRA_DIST += README.cal README.ddate README.namei README.namei2
mcookie_SOURCES = mcookie.c ../lib/md5.c
--- /dev/null
+++ b/misc-utils/wakeup.c
@@ -0,0 +1,379 @@
+/* gcc -Wall -Os -o rtcwake rtcwake.c */
+
+#include <stdio.h>
+#include <getopt.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <time.h>
+
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include <linux/rtc.h>
+
+/* constants from legacy PC/AT hardware */
+#define RTC_PF 0x40
+#define RTC_AF 0x20
+#define RTC_UF 0x10
+
+/*
+ * rtcwake -- enter a system sleep state until specified wakeup time.
+ *
+ * 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).
+ */
+
+static char *progname;
+
+#ifdef DEBUG
+#define VERSION "1.0 dev (" __DATE__ " " __TIME__ ")"
+#else
+#define VERSION "0.9"
+#endif
+
+static unsigned verbose;
+static int rtc_is_utc = -1;
+
+static int may_wakeup(const char *devname)
+{
+ char buf[128], *s;
+ FILE *f;
+
+ snprintf(buf, sizeof buf, "/sys/class/rtc/%s/device/power/wakeup",
+ devname);
+ f = fopen(buf, "r");
+ if (!f) {
+ perror(buf);
+ return 0;
+ }
+ fgets(buf, sizeof buf, f);
+ fclose(f);
+
+ s = strchr(buf, '\n');
+ if (!s)
+ return 0;
+ *s = 0;
+
+ /* wakeup events could be disabled or not supported */
+ return strcmp(buf, "enabled") == 0;
+}
+
+/* all times should be in UTC */
+static time_t sys_time;
+static time_t rtc_time;
+
+static int get_basetimes(int fd)
+{
+ struct tm tm;
+ struct rtc_time rtc;
+
+ /* this process works in RTC time, except when working
+ * with the system clock (which always uses UTC).
+ */
+ if (rtc_is_utc)
+ setenv("TZ", "UTC", 1);
+ tzset();
+
+ /* read rtc and system clocks "at the same time", or as
+ * precisely (+/- a second) as we can read them.
+ */
+ if (ioctl(fd, RTC_RD_TIME, &rtc) < 0) {
+ perror("read rtc time");
+ return 0;
+ }
+ sys_time = time(0);
+ if (sys_time == (time_t)-1) {
+ perror("read system time");
+ return 0;
+ }
+
+ /* convert rtc_time to normal arithmetic-friendly form,
+ * updating tm.tm_wday as used by asctime().
+ */
+ memset(&tm, 0, sizeof tm);
+ tm.tm_sec = rtc.tm_sec;
+ tm.tm_min = rtc.tm_min;
+ tm.tm_hour = rtc.tm_hour;
+ tm.tm_mday = rtc.tm_mday;
+ tm.tm_mon = rtc.tm_mon;
+ tm.tm_year = rtc.tm_year;
+ tm.tm_isdst = rtc.tm_isdst; /* stays unspecified? */
+ rtc_time = mktime(&tm);
+
+ if (rtc_time == (time_t)-1) {
+ perror("convert rtc time");
+ return 0;
+ }
+
+ if (verbose) {
+ if (!rtc_is_utc) {
+ printf("\ttzone = %ld\n", timezone);
+ printf("\ttzname = %s\n", tzname[daylight]);
+ gmtime_r(&rtc_time, &tm);
+ }
+ printf("\tsystime = %ld, (UTC) %s",
+ (long) sys_time, asctime(gmtime(&sys_time)));
+ printf("\trtctime = %ld, (UTC) %s",
+ (long) rtc_time, asctime(&tm));
+ }
+
+ return 1;
+}
+
+static int setup_alarm(int fd, time_t *wakeup)
+{
+ struct tm *tm;
+ struct rtc_wkalrm wake;
+
+ tm = gmtime(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;
+ wake.time.tm_wday = tm->tm_wday;
+ wake.time.tm_yday = tm->tm_yday;
+ wake.time.tm_isdst = tm->tm_isdst;
+
+ /* many rtc alarms only support up to 24 hours from 'now' ... */
+ if ((rtc_time + (24 * 60 * 60)) > *wakeup) {
+ if (ioctl(fd, RTC_ALM_SET, &wake.time) < 0) {
+ perror("set rtc alarm");
+ return 0;
+ }
+ if (ioctl(fd, RTC_AIE_ON, 0) < 0) {
+ perror("enable rtc alarm");
+ return 0;
+ }
+
+ /* ... so use the "more than 24 hours" request only if we must */
+ } else {
+ /* avoid an extra AIE_ON call */
+ wake.enabled = 1;
+
+ if (ioctl(fd, RTC_WKALM_SET, &wake) < 0) {
+ perror("set rtc wake alarm");
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+static void suspend_system(const char *suspend)
+{
+ FILE *f = fopen("/sys/power/state", "w");
+
+ if (!f) {
+ perror("/sys/power/state");
+ return;
+ }
+
+ fprintf(f, "%s\n", suspend);
+ fflush(f);
+
+ /* this executes after wake from suspend */
+ fclose(f);
+}
+
+int main(int argc, char **argv)
+{
+ static char *devname = "rtc0";
+ static unsigned seconds = 0;
+ static char *suspend = "standby";
+
+ int t;
+ int fd;
+ time_t alarm = 0;
+
+ progname = strrchr(argv[0], '/');
+ if (progname)
+ progname++;
+ else
+ progname = argv[0];
+ if (chdir("/dev/") < 0) {
+ perror("chdir /dev");
+ return 1;
+ }
+
+ while ((t = getopt(argc, argv, "d:lm:s:t:uVv")) != EOF) {
+ switch (t) {
+
+ case 'd':
+ devname = optarg;
+ break;
+
+ case 'l':
+ rtc_is_utc = 0;
+ break;
+
+ /* what system power mode to use? for now handle only
+ * standardized mode names; eventually when systems define
+ * their own state names, parse /sys/power/state.
+ *
+ * "on" is used just to test the RTC alarm mechanism,
+ * bypassing all the wakeup-from-sleep infrastructure.
+ */
+ case 'm':
+ if (strcmp(optarg, "standby") == 0
+ || strcmp(optarg, "mem") == 0
+ || strcmp(optarg, "disk") == 0
+ || strcmp(optarg, "on") == 0
+ ) {
+ suspend = optarg;
+ break;
+ }
+ printf("%s: unrecognized suspend state '%s'\n",
+ progname, optarg);
+ goto usage;
+
+ /* alarm time, seconds-to-sleep (relative) */
+ case 's':
+ t = atoi(optarg);
+ if (t < 0) {
+ printf("%s: illegal interval %s seconds\n",
+ progname, optarg);
+ goto usage;
+ }
+ seconds = t;
+ break;
+
+ /* alarm time, time_t (absolute, seconds since 1/1 1970 UTC) */
+ case 't':
+ t = atoi(optarg);
+ if (t < 0) {
+ printf("%s: illegal time_t value %s\n",
+ progname, optarg);
+ goto usage;
+ }
+ alarm = t;
+ break;
+
+ case 'u':
+ rtc_is_utc = 1;
+ break;
+
+ case 'v':
+ verbose++;
+ break;
+
+ case 'V':
+ printf("%s: version %s\n", progname, VERSION);
+ break;
+
+ default:
+usage:
+ printf("usage: %s [options]"
+ "\n\t"
+ "-d rtc0|rtc1|...\t(select rtc)"
+ "\n\t"
+ "-l\t\t\t(RTC uses local timezone)"
+ "\n\t"
+ "-m standby|mem|...\t(sleep mode)"
+ "\n\t"
+ "-s seconds\t\t(seconds to sleep)"
+ "\n\t"
+ "-t time_t\t\t(time to wake)"
+ "\n\t"
+ "-u\t\t\t(RTC uses UTC)"
+ "\n\t"
+ "-v\t\t\t(verbose messages)"
+ "\n\t"
+ "-V\t\t\t(show version)"
+ "\n",
+ progname);
+ return 1;
+ }
+ }
+
+ if (!alarm && !seconds) {
+ printf("%s: must provide wake time\n", progname);
+ goto usage;
+ }
+
+ /* REVISIT: if /etc/adjtime exists, read it to see what
+ * the util-linux version of hwclock assumes.
+ */
+ if (rtc_is_utc == -1) {
+ printf("%s: assuming RTC uses UTC ...\n", progname);
+ rtc_is_utc = 1;
+ }
+
+ /* this RTC must exist and (if we'll sleep) be wakeup-enabled */
+ fd = open(devname, O_RDONLY);
+ if (fd < 0) {
+ perror(devname);
+ return 1;
+ }
+ if (strcmp(suspend, "on") != 0 && !may_wakeup(devname)) {
+ printf("%s: %s not enabled for wakeup events\n",
+ progname, devname);
+ return 1;
+ }
+
+ /* relative or absolute alarm time, normalized to time_t */
+ if (!get_basetimes(fd))
+ return 1;
+ if (verbose)
+ printf("alarm %ld, sys_time %ld, rtc_time %ld, seconds %u\n",
+ alarm, sys_time, rtc_time, seconds);
+ if (alarm) {
+ if (alarm < sys_time) {
+ printf("%s: time doesn't go backward to %s",
+ progname, ctime(&alarm));
+ return 1;
+ }
+ alarm += sys_time - rtc_time;
+ } else
+ alarm = rtc_time + seconds + 1;
+ if (setup_alarm(fd, &alarm) < 0)
+ return 1;
+
+ sync();
+ printf("%s: wakeup from \"%s\" using %s at %s",
+ progname, suspend, devname,
+ ctime(&alarm));
+ fflush(stdout);
+ usleep(10 * 1000);
+
+ if (strcmp(suspend, "on") != 0)
+ suspend_system(suspend);
+ else {
+ unsigned long data;
+
+ do {
+ t = read(fd, &data, sizeof data);
+ if (t < 0) {
+ perror("rtc read");
+ break;
+ }
+ if (verbose)
+ printf("... %s: %03lx\n", devname, data);
+ } while (!(data & RTC_AF));
+ }
+
+ if (ioctl(fd, RTC_AIE_OFF, 0) < 0)
+ perror("disable rtc alarm interrupt");
+
+ close(fd);
+ return 0;
+}
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