Created
October 1, 2012 19:49
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Morning Alarms
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| #include <stdio.h> | |
| #include <linux/rtc.h> | |
| #include <sys/ioctl.h> | |
| #include <fcntl.h> | |
| #include <unistd.h> | |
| #include <stdlib.h> | |
| #include <errno.h> | |
| #include <time.h> | |
| #include <sys/types.h> | |
| /* | |
| * This expects the new RTC class driver framework, working with | |
| * clocks that will often not be clones of what the PC-AT had. | |
| * Use the command line to specify another RTC if you need one. | |
| */ | |
| static const char default_rtc[] = "/dev/rtc0"; | |
| int days_per_month[12] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | |
| int main(int argc, char **argv) | |
| { | |
| int fd, retval; | |
| struct tm *tm; | |
| time_t now; | |
| const char *rtc = default_rtc; | |
| /* Get current time */ | |
| now = time(0); | |
| tm = localtime(&now); | |
| if ((tm->tm_year + 1900) % 4 != 0) { | |
| days_per_month[1]--; | |
| } | |
| if (tm->tm_hour > 7) { | |
| tm->tm_mday++; | |
| } | |
| tm->tm_hour = 6; | |
| tm->tm_min = 59; | |
| tm->tm_sec = 30; | |
| if (tm->tm_mday > days_per_month[tm->tm_mon]) { | |
| tm->tm_mday = 1; | |
| tm->tm_mon++; | |
| } | |
| if (tm->tm_mon > 12) { | |
| tm->tm_mon = 0; | |
| tm->tm_year++; | |
| } | |
| fd = open(rtc, O_RDONLY); | |
| if (fd == -1) { | |
| perror(rtc); | |
| exit(errno); | |
| } | |
| retval = ioctl(fd, RTC_ALM_SET, tm); | |
| if (retval == -1) { | |
| perror("RTC_ALM_SET ioctl"); | |
| exit(errno); | |
| } | |
| /* Enable alarm interrupts */ | |
| retval = ioctl(fd, RTC_AIE_ON, 0); | |
| if (retval == -1) { | |
| perror("RTC_AIE_ON ioctl"); | |
| exit(errno); | |
| } | |
| /* Read the current alarm settings */ | |
| retval = ioctl(fd, RTC_ALM_READ, tm); | |
| if (retval == -1) { | |
| perror("RTC_ALM_READ ioctl"); | |
| exit(errno); | |
| } | |
| fprintf(stdout, "Alarm time now set to %d-%d-%d, %02d:%02d:%02d.\n", | |
| tm->tm_mday, tm->tm_mon + 1, tm->tm_year + 1900, | |
| tm->tm_hour, tm->tm_min, tm->tm_sec); | |
| setgid(1000); setuid(1000); | |
| system("at 7:00 -f /home/mik/play"); | |
| return 0; | |
| } |
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