653 lines
16 KiB
C
653 lines
16 KiB
C
/*
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* rtcwake -- enter a system sleep state until specified wakeup time.
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*
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* This uses cross-platform Linux interfaces to enter a system sleep state,
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* and leave it no later than a specified time. It uses any RTC framework
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* driver that supports standard driver model wakeup flags.
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*
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* This is normally used like the old "apmsleep" utility, to wake from a
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* suspend state like ACPI S1 (standby) or S3 (suspend-to-RAM). Most
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* platforms can implement those without analogues of BIOS, APM, or ACPI.
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*
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* On some systems, this can also be used like "nvram-wakeup", waking
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* from states like ACPI S4 (suspend to disk). Not all systems have
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* persistent media that are appropriate for such suspend modes.
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*
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* The best way to set the system's RTC is so that it holds the current
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* time in UTC. Use the "-l" flag to tell this program that the system
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* RTC uses a local timezone instead (maybe you dual-boot MS-Windows).
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* That flag should not be needed on systems with adjtime support.
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*/
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#include <stdio.h>
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#include <getopt.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <time.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <linux/rtc.h>
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#include "nls.h"
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#include "xalloc.h"
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#include "pathnames.h"
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#include "strutils.h"
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#include "c.h"
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#include "closestream.h"
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/* constants from legacy PC/AT hardware */
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#define RTC_PF 0x40
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#define RTC_AF 0x20
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#define RTC_UF 0x10
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#define MAX_LINE 1024
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#define RTC_PATH "/sys/class/rtc/%s/device/power/wakeup"
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#define SYS_POWER_STATE_PATH "/sys/power/state"
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#define DEFAULT_DEVICE "/dev/rtc0"
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#define DEFAULT_MODE "standby"
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enum ClockMode {
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CM_AUTO,
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CM_UTC,
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CM_LOCAL
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};
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static char *adjfile = _PATH_ADJTIME;
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static unsigned verbose;
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static unsigned dryrun;
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enum ClockMode clock_mode = CM_AUTO;
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static void __attribute__((__noreturn__)) usage(FILE *out)
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{
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fputs(USAGE_HEADER, out);
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fprintf(out,
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_(" %s [options]\n"), program_invocation_short_name);
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fputs(USAGE_SEPARATOR, out);
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fputs(_("Enter a system sleep state until a specified wakeup time.\n"), out);
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fputs(USAGE_OPTIONS, out);
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fputs(_(" -a, --auto reads the clock mode from adjust file (default)\n"), out);
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fprintf(out,
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_(" -A, --adjfile <file> specifies the path to the adjust file\n"
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" the default is %s\n"), _PATH_ADJTIME);
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fputs(_(" -d, --device <device> select rtc device (rtc0|rtc1|...)\n"), out);
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fputs(_(" -n, --dry-run does everything, but suspend\n"), out);
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fputs(_(" -l, --local RTC uses local timezone\n"), out);
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fputs(_(" -m, --mode <mode> standby|mem|... sleep mode\n"), out);
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fputs(_(" -s, --seconds <seconds> seconds to sleep\n"), out);
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fputs(_(" -t, --time <time_t> time to wake\n"), out);
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fputs(_(" -u, --utc RTC uses UTC\n"), out);
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fputs(_(" -v, --verbose verbose messages\n"), out);
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printf(USAGE_SEPARATOR);
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printf(USAGE_HELP);
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printf(USAGE_VERSION);
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printf(USAGE_MAN_TAIL("rtcwake(8)"));
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exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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static int is_wakeup_enabled(const char *devname)
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{
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char buf[128], *s;
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FILE *f;
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/* strip the '/dev/' from the devname here */
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snprintf(buf, sizeof buf, RTC_PATH, devname + strlen("/dev/"));
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f = fopen(buf, "r");
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if (!f) {
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warn(_("cannot open %s"), buf);
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return 0;
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}
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s = fgets(buf, sizeof buf, f);
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fclose(f);
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if (!s)
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return 0;
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s = strchr(buf, '\n');
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if (!s)
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return 0;
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*s = 0;
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/* wakeup events could be disabled or not supported */
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return strcmp(buf, "enabled") == 0;
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}
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/* all times should be in UTC */
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static time_t sys_time;
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static time_t rtc_time;
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static int get_basetimes(int fd)
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{
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struct tm tm;
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struct rtc_time rtc;
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/* this process works in RTC time, except when working
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* with the system clock (which always uses UTC).
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*/
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if (clock_mode == CM_UTC)
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setenv("TZ", "UTC", 1);
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tzset();
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/* read rtc and system clocks "at the same time", or as
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* precisely (+/- a second) as we can read them.
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*/
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if (ioctl(fd, RTC_RD_TIME, &rtc) < 0) {
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warn(_("read rtc time failed"));
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return -1;
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}
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sys_time = time(0);
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if (sys_time == (time_t)-1) {
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warn(_("read system time failed"));
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return -1;
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}
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/* convert rtc_time to normal arithmetic-friendly form,
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* updating tm.tm_wday as used by asctime().
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*/
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memset(&tm, 0, sizeof tm);
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tm.tm_sec = rtc.tm_sec;
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tm.tm_min = rtc.tm_min;
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tm.tm_hour = rtc.tm_hour;
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tm.tm_mday = rtc.tm_mday;
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tm.tm_mon = rtc.tm_mon;
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tm.tm_year = rtc.tm_year;
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tm.tm_isdst = -1; /* assume the system knows better than the RTC */
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rtc_time = mktime(&tm);
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if (rtc_time == (time_t)-1) {
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warn(_("convert rtc time failed"));
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return -1;
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}
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if (verbose) {
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/* Unless the system uses UTC, either delta or tzone
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* reflects a seconds offset from UTC. The value can
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* help sort out problems like bugs in your C library.
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*/
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printf("\tdelta = %ld\n", sys_time - rtc_time);
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printf("\ttzone = %ld\n", timezone);
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printf("\ttzname = %s\n", tzname[daylight]);
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gmtime_r(&rtc_time, &tm);
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printf("\tsystime = %ld, (UTC) %s",
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(long) sys_time, asctime(gmtime(&sys_time)));
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printf("\trtctime = %ld, (UTC) %s",
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(long) rtc_time, asctime(&tm));
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}
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return 0;
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}
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static int setup_alarm(int fd, time_t *wakeup)
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{
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struct tm *tm;
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struct rtc_wkalrm wake;
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/* The wakeup time is in POSIX time (more or less UTC).
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* Ideally RTCs use that same time; but PCs can't do that
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* if they need to boot MS-Windows. Messy...
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*
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* When clock_mode == CM_UTC this process's timezone is UTC,
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* so we'll pass a UTC date to the RTC.
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*
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* Else clock_mode == CM_LOCAL so the time given to the RTC
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* will instead use the local time zone.
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*/
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tm = localtime(wakeup);
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wake.time.tm_sec = tm->tm_sec;
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wake.time.tm_min = tm->tm_min;
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wake.time.tm_hour = tm->tm_hour;
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wake.time.tm_mday = tm->tm_mday;
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wake.time.tm_mon = tm->tm_mon;
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wake.time.tm_year = tm->tm_year;
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/* wday, yday, and isdst fields are unused by Linux */
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wake.time.tm_wday = -1;
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wake.time.tm_yday = -1;
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wake.time.tm_isdst = -1;
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wake.enabled = 1;
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/* First try the preferred RTC_WKALM_SET */
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if (!dryrun && ioctl(fd, RTC_WKALM_SET, &wake) < 0) {
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wake.enabled = 0;
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/* Fall back on the non-preferred way of setting wakeups; only
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* works for alarms < 24 hours from now */
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if ((rtc_time + (24 * 60 * 60)) > *wakeup) {
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if (ioctl(fd, RTC_ALM_SET, &wake.time) < 0) {
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warn(_("set rtc alarm failed"));
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return -1;
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}
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if (ioctl(fd, RTC_AIE_ON, 0) < 0) {
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warn(_("enable rtc alarm failed"));
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return -1;
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}
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} else {
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warn(_("set rtc wake alarm failed"));
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return -1;
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}
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}
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return 0;
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}
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static int is_suspend_available(const char *suspend)
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{
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int rc;
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char buf[32];
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FILE *f = fopen(SYS_POWER_STATE_PATH, "r");
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if (!f)
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return -1;
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if (fgets(buf, sizeof buf, f) == NULL)
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rc = -1;
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else
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rc = strstr(buf, suspend) != NULL;
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fclose(f);
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return rc;
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}
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static void suspend_system(const char *suspend)
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{
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FILE *f = fopen(SYS_POWER_STATE_PATH, "w");
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if (!f) {
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warn(_("cannot open %s"), SYS_POWER_STATE_PATH);
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return;
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}
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if (!dryrun) {
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fprintf(f, "%s\n", suspend);
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fflush(f);
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}
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/* this executes after wake from suspend */
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if (close_stream(f))
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errx(EXIT_FAILURE, _("write error"));
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}
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static int read_clock_mode(void)
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{
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FILE *fp;
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char linebuf[MAX_LINE];
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fp = fopen(adjfile, "r");
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if (!fp)
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return -1;
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/* skip first line */
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if (!fgets(linebuf, MAX_LINE, fp)) {
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fclose(fp);
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return -1;
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}
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/* skip second line */
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if (!fgets(linebuf, MAX_LINE, fp)) {
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fclose(fp);
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return -1;
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}
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/* read third line */
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if (!fgets(linebuf, MAX_LINE, fp)) {
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fclose(fp);
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return -1;
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}
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if (strncmp(linebuf, "UTC", 3) == 0)
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clock_mode = CM_UTC;
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else if (strncmp(linebuf, "LOCAL", 5) == 0)
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clock_mode = CM_LOCAL;
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fclose(fp);
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return 0;
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}
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/**
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* print basic alarm settings
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*/
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static int print_alarm(int fd)
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{
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struct rtc_wkalrm wake;
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struct rtc_time rtc;
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struct tm tm;
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time_t alarm;
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/* First try the preferred RTC_WKALM_RD */
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if (ioctl(fd, RTC_WKALM_RD, &wake) < 0) {
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/* Fall back on the non-preferred way of reading wakeups; only
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* works for alarms < 24 hours from now
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*
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* set wake.enabled to 1 and determine from value of the year-1
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* means disabled
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*/
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wake.enabled = 1;
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if (ioctl(fd, RTC_ALM_READ, &wake.time) < 0) {
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warn(_("read rtc alarm failed"));
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return -1;
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}
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}
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if (wake.enabled != 1 || wake.time.tm_year == -1) {
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printf(_("alarm: off\n"));
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return 0;
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}
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rtc = wake.time;
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memset(&tm, 0, sizeof tm);
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tm.tm_sec = rtc.tm_sec;
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tm.tm_min = rtc.tm_min;
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tm.tm_hour = rtc.tm_hour;
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tm.tm_mday = rtc.tm_mday;
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tm.tm_mon = rtc.tm_mon;
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tm.tm_year = rtc.tm_year;
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tm.tm_isdst = -1; /* assume the system knows better than the RTC */
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alarm = mktime(&tm);
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if (alarm == (time_t)-1) {
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warn(_("convert time failed"));
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return -1;
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}
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/* 0 if both UTC, or expresses diff if RTC in local time */
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alarm += sys_time - rtc_time;
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printf(_("alarm: on %s"), ctime(&alarm));
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return 0;
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}
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int main(int argc, char **argv)
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{
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char *devname = DEFAULT_DEVICE;
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unsigned seconds = 0;
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char *suspend = DEFAULT_MODE;
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int rc = EXIT_SUCCESS;
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int t;
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int fd;
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time_t alarm = 0;
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static const struct option long_options[] = {
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{"adjfile", required_argument, 0, 'A'},
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{"auto", no_argument, 0, 'a'},
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{"dry-run", no_argument, 0, 'n'},
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{"local", no_argument, 0, 'l'},
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{"utc", no_argument, 0, 'u'},
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{"verbose", no_argument, 0, 'v'},
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{"version", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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{"mode", required_argument, 0, 'm'},
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{"device", required_argument, 0, 'd'},
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{"seconds", required_argument, 0, 's'},
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{"time", required_argument, 0, 't'},
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{0, 0, 0, 0 }
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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atexit(close_stdout);
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while ((t = getopt_long(argc, argv, "A:ahd:lm:ns:t:uVv",
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long_options, NULL)) != EOF) {
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switch (t) {
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case 'A':
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/* for better compatibility with hwclock */
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adjfile = optarg;
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break;
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case 'a':
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/* CM_AUTO is default */
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break;
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case 'd':
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devname = optarg;
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break;
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case 'l':
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clock_mode = CM_LOCAL;
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break;
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/* what system power mode to use? for now handle only
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* standardized mode names; eventually when systems
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* define their own state names, parse
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* /sys/power/state.
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*
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* "on" is used just to test the RTC alarm mechanism,
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* bypassing all the wakeup-from-sleep infrastructure.
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*/
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case 'm':
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if (strcmp(optarg, "standby") == 0
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|| strcmp(optarg, "mem") == 0
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|| strcmp(optarg, "disk") == 0
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|| strcmp(optarg, "on") == 0
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|| strcmp(optarg, "no") == 0
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|| strcmp(optarg, "off") == 0
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|| strcmp(optarg, "freeze") == 0
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|| strcmp(optarg, "disable") == 0
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|| strcmp(optarg, "show") == 0
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) {
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suspend = optarg;
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break;
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}
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errx(EXIT_FAILURE, _("unrecognized suspend state '%s'"),
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optarg);
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break;
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case 'n':
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dryrun = 1;
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break;
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/* alarm time, seconds-to-sleep (relative) */
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case 's':
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seconds = strtou32_or_err(optarg, _("invalid seconds argument"));
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break;
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/* alarm time, time_t (absolute, seconds since
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* 1/1 1970 UTC)
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*/
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case 't':
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alarm = strtou32_or_err(optarg, _("invalid time argument"));
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break;
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case 'u':
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clock_mode = CM_UTC;
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break;
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case 'v':
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verbose++;
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break;
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case 'V':
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printf(UTIL_LINUX_VERSION);
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exit(EXIT_SUCCESS);
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case 'h':
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usage(stdout);
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default:
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usage(stderr);
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}
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}
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if (clock_mode == CM_AUTO) {
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if (read_clock_mode() < 0) {
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printf(_("%s: assuming RTC uses UTC ...\n"),
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program_invocation_short_name);
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clock_mode = CM_UTC;
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}
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}
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if (verbose)
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printf("%s", clock_mode == CM_UTC ? _("Using UTC time.\n") :
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_("Using local time.\n"));
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if (!alarm && !seconds && strcmp(suspend,"disable") &&
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strcmp(suspend,"show")) {
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warnx(_("must provide wake time (see -t and -s options)"));
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usage(stderr);
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}
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/* when devname doesn't start with /dev, append it */
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if (strncmp(devname, "/dev/", strlen("/dev/")) != 0) {
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char *new_devname;
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new_devname = xmalloc(strlen(devname) + strlen("/dev/") + 1);
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strcpy(new_devname, "/dev/");
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strcat(new_devname, devname);
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devname = new_devname;
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}
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if (strcmp(suspend, "on") != 0 && strcmp(suspend, "no") != 0
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&& !is_wakeup_enabled(devname))
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errx(EXIT_FAILURE, _("%s not enabled for wakeup events"), devname);
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/* this RTC must exist and (if we'll sleep) be wakeup-enabled */
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#ifdef O_CLOEXEC
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fd = open(devname, O_RDONLY | O_CLOEXEC);
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#else
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fd = open(devname, O_RDONLY);
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#endif
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if (fd < 0)
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err(EXIT_FAILURE, _("cannot open %s"), devname);
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/* relative or absolute alarm time, normalized to time_t */
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if (get_basetimes(fd) < 0)
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exit(EXIT_FAILURE);
|
|
if (verbose)
|
|
printf(_("alarm %ld, sys_time %ld, rtc_time %ld, seconds %u\n"),
|
|
alarm, sys_time, rtc_time, seconds);
|
|
|
|
if (strcmp(suspend, "show") && strcmp(suspend, "disable")) {
|
|
if (strcmp(suspend, "no") && strcmp(suspend, "on") &&
|
|
strcmp(suspend, "off") && is_suspend_available(suspend) <= 0) {
|
|
errx(EXIT_FAILURE, _("suspend to \"%s\" unavailable"), suspend);
|
|
}
|
|
|
|
/* care about alarm setup only if the show|disable
|
|
* modes are not set
|
|
*/
|
|
if (alarm) {
|
|
if (alarm < sys_time)
|
|
errx(EXIT_FAILURE, _("time doesn't go backward to %s"),
|
|
ctime(&alarm));
|
|
alarm += sys_time - rtc_time;
|
|
} else
|
|
alarm = rtc_time + seconds + 1;
|
|
|
|
if (setup_alarm(fd, &alarm) < 0)
|
|
exit(EXIT_FAILURE);
|
|
|
|
if (strcmp(suspend, "no") == 0 || strcmp(suspend, "on") == 0)
|
|
printf(_("%s: wakeup using %s at %s"),
|
|
program_invocation_short_name, devname,
|
|
ctime(&alarm));
|
|
else
|
|
printf(_("%s: wakeup from \"%s\" using %s at %s"),
|
|
program_invocation_short_name, suspend, devname,
|
|
ctime(&alarm));
|
|
fflush(stdout);
|
|
xusleep(10 * 1000);
|
|
}
|
|
|
|
if (strcmp(suspend, "no") == 0) {
|
|
if (verbose)
|
|
printf(_("suspend mode: no; leaving\n"));
|
|
dryrun = 1; /* to skip disabling alarm at the end */
|
|
|
|
} else if (strcmp(suspend, "off") == 0) {
|
|
char *arg[5];
|
|
int i = 0;
|
|
|
|
if (verbose)
|
|
printf(_("suspend mode: off; executing %s\n"),
|
|
_PATH_SHUTDOWN);
|
|
arg[i++] = _PATH_SHUTDOWN;
|
|
arg[i++] = "-h";
|
|
arg[i++] = "-P";
|
|
arg[i++] = "now";
|
|
arg[i] = NULL;
|
|
|
|
if (!dryrun) {
|
|
execv(arg[0], arg);
|
|
|
|
warn(_("failed to execute %s"), _PATH_SHUTDOWN);
|
|
rc = EXIT_FAILURE;
|
|
}
|
|
|
|
} else if (strcmp(suspend, "on") == 0) {
|
|
unsigned long data;
|
|
|
|
if (verbose)
|
|
printf(_("suspend mode: on; reading rtc\n"));
|
|
|
|
if (!dryrun) {
|
|
do {
|
|
t = read(fd, &data, sizeof data);
|
|
if (t < 0) {
|
|
warn(_("rtc read failed"));
|
|
break;
|
|
}
|
|
if (verbose)
|
|
printf("... %s: %03lx\n", devname, data);
|
|
} while (!(data & RTC_AF));
|
|
}
|
|
|
|
} else if (strcmp(suspend, "disable") == 0) {
|
|
/* just break, alarm gets disabled in the end */
|
|
if (verbose)
|
|
printf(_("suspend mode: disable; disabling alarm\n"));
|
|
|
|
} else if(strcmp(suspend,"show") == 0) {
|
|
if (verbose)
|
|
printf(_("suspend mode: show; printing alarm info\n"));
|
|
if (print_alarm(fd))
|
|
rc = EXIT_FAILURE;
|
|
dryrun = 1; /* don't really disable alarm in the end, just show */
|
|
|
|
} else {
|
|
if (verbose)
|
|
printf(_("suspend mode: %s; suspending system\n"), suspend);
|
|
sync();
|
|
suspend_system(suspend);
|
|
}
|
|
|
|
if (!dryrun) {
|
|
/* try to disable the alarm with the preferred RTC_WKALM_RD and
|
|
* RTC_WKALM_SET calls, if it fails fall back to RTC_AIE_OFF
|
|
*/
|
|
struct rtc_wkalrm wake;
|
|
|
|
if (ioctl(fd, RTC_WKALM_RD, &wake) < 0) {
|
|
if (ioctl(fd, RTC_AIE_OFF, 0) < 0) {
|
|
warn(_("disable rtc alarm interrupt failed"));
|
|
rc = EXIT_FAILURE;
|
|
}
|
|
} else {
|
|
wake.enabled = 0;
|
|
if (ioctl(fd, RTC_WKALM_SET, &wake) < 0) {
|
|
warn(_("disable rtc alarm interrupt failed"));
|
|
rc = EXIT_FAILURE;
|
|
}
|
|
}
|
|
}
|
|
|
|
close(fd);
|
|
return rc;
|
|
}
|