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rtcwake: add --dry-run option 

Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2010-04-08 09:20:21 +02:00
parent ecd55f9647
commit 569f3ca278
2 changed files with 37 additions and 19 deletions
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8
sys-utils/rtcwake.8
View File

@ -21,7 +21,7 @@
rtcwake - enter a system sleep state until specified wakeup time
.SH SYNOPSIS
.B rtcwake
.RB [ \-hvVlua ]
.RB [ \-hvVluan ]
.RB [ \-d
.IR device ]
.RB [ \-m
@ -52,11 +52,15 @@ Display a short help message that shows how to use the program.
\fB-V\fP | \fB--version\fP
Displays version information and exists.
.TP
\fB-n\fP | \fB--dry-run\fP
This option does everything but actually setup alarm, suspend system or wait
for the alarm.
.TP
\fB-a\fP | \fB--auto\fP
Reads the clock mode (whether the hardware clock is set to UTC or local time)
from \fI/etc/adjtime\fP. That's the location where the
.BR hwclock (8)
stores that information.
stores that information. This is the default.
.TP
\fB-l\fP | \fB--local\fP
Assumes that the hardware clock is set to local time, regardless of the

48
sys-utils/rtcwake.c
View File

@ -62,10 +62,12 @@ enum ClockMode {
};
static unsigned verbose;
static unsigned dryrun;
enum ClockMode clock_mode = CM_AUTO;
static struct option long_options[] = {
{"auto", no_argument, 0, 'a'},
{"dry-run", no_argument, 0, 'n'},
{"local", no_argument, 0, 'l'},
{"utc", no_argument, 0, 'u'},
{"verbose", no_argument, 0, 'v'},
@ -82,6 +84,7 @@ static void usage(int retval)
{
printf(_("usage: %s [options]\n"
" -d | --device <device> select rtc device (rtc0|rtc1|...)\n"
" -n | --dry-run does everything, but suspend\n"
" -l | --local RTC uses local timezone\n"
" -m | --mode standby|mem|... sleep mode\n"
" -s | --seconds <seconds> seconds to sleep\n"
@ -214,8 +217,9 @@ static int setup_alarm(int fd, time_t *wakeup)
wake.time.tm_isdst = -1;
wake.enabled = 1;
/* First try the preferred RTC_WKALM_SET */
if (ioctl(fd, RTC_WKALM_SET, &wake) < 0) {
if (!dryrun && ioctl(fd, RTC_WKALM_SET, &wake) < 0) {
wake.enabled = 0;
/* Fall back on the non-preferred way of setting wakeups; only
* works for alarms < 24 hours from now */
@ -246,8 +250,10 @@ static void suspend_system(const char *suspend)
return;
}
fprintf(f, "%s\n", suspend);
fflush(f);
if (!dryrun) {
fprintf(f, "%s\n", suspend);
fflush(f);
}
/* this executes after wake from suspend */
fclose(f);
@ -308,7 +314,7 @@ int main(int argc, char **argv)
progname = basename(argv[0]);
while ((t = getopt_long(argc, argv, "ahd:lm:s:t:uVv",
while ((t = getopt_long(argc, argv, "ahd:lm:ns:t:uVv",
long_options, NULL)) != EOF) {
switch (t) {
case 'a':
@ -347,6 +353,10 @@ int main(int argc, char **argv)
progname, optarg);
usage(EXIT_FAILURE);
case 'n':
dryrun = 1;
break;
/* alarm time, seconds-to-sleep (relative) */
case 's':
t = atoi(optarg);
@ -486,11 +496,13 @@ int main(int argc, char **argv)
arg[i++] = "now";
arg[i] = NULL;
execv(arg[0], arg);
if (!dryrun) {
execv(arg[0], arg);
fprintf(stderr, _("%s: unable to execute %s: %s\n"),
fprintf(stderr, _("%s: unable to execute %s: %s\n"),
progname, _PATH_SHUTDOWN, strerror(errno));
rc = EXIT_FAILURE;
rc = EXIT_FAILURE;
}
} else if (strcmp(suspend, "on") == 0) {
unsigned long data;
@ -498,15 +510,17 @@ int main(int argc, char **argv)
if (verbose)
printf(_("suspend mode: on; reading rtc\n"));
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 (!dryrun) {
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));
}
} else {
if (verbose)
@ -515,7 +529,7 @@ int main(int argc, char **argv)
suspend_system(suspend);
}
if (ioctl(fd, RTC_AIE_OFF, 0) < 0)
if (!dryrun && ioctl(fd, RTC_AIE_OFF, 0) < 0)
perror(_("disable rtc alarm interrupt"));
close(fd);