ubase

suckless linux base utils
git clone git://git.2f30.org/ubase.git
Log | Files | Refs | README | LICENSE

commit dacfb76c75bbd9a5020d4a3bd22b993e1e9dfebd
parent c4051021c90a5af2b62cd9fcdb800cc992eb2d7c
Author: sin <sin@2f30.org>
Date:   Tue Jun  3 14:46:27 +0100

Add initial version of hwclock(8)

Diffstat:
Makefile | 3++-
hwclock.c | 106+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
rtc.h | 2++
3 files changed, 110 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile @@ -3,7 +3,7 @@ include config.mk .POSIX: .SUFFIXES: .c .o -HDR = arg.h config.def.h proc.h reboot.h util.h +HDR = arg.h config.def.h proc.h reboot.h rtc.h util.h LIB = \ util/agetcwd.o \ util/apathmax.o \ @@ -29,6 +29,7 @@ SRC = \ free.c \ getty.c \ halt.c \ + hwclock.c \ id.c \ insmod.c \ killall5.c \ diff --git a/hwclock.c b/hwclock.c @@ -0,0 +1,106 @@ +/* See LICENSE file for copyright and license details. */ +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/time.h> +#include <sys/types.h> +#include <time.h> +#include <unistd.h> +#include "rtc.h" +#include "util.h" + +static void echotime(char *); +static void readrtctm(struct tm *, int); +static void writertctm(struct tm *, int); +static void writetime(char *); + +static void +usage(void) +{ + eprintf("usage: %s [-rw] [-u]\n", argv0); +} + +int +main(int argc, char *argv[]) +{ + char *dev = "/dev/rtc"; + int rflag = 0; + int wflag = 0; + + ARGBEGIN { + case 'r': + rflag = 1; + break; + case 'w': + wflag = 1; + break; + case 'u': + break; + default: + usage(); + } ARGEND; + + if ((rflag ^ wflag) == 0) + eprintf("missing or incompatible function\n"); + + /* Only UTC support at the moment */ + setenv("TZ", "UTC0", 1); + tzset(); + + if (rflag == 1) + echotime(dev); + else if (wflag == 1) + writetime(dev); + + return EXIT_SUCCESS; +} + +static void +echotime(char *dev) +{ + struct tm tm; + time_t t; + int fd; + + fd = open(dev, O_RDONLY); + if (fd < 0) + eprintf("open %s:", dev); + readrtctm(&tm, fd); + t = mktime(&tm); + printf("%s", asctime(localtime(&t))); + close(fd); +} + +static void +readrtctm(struct tm *tm, int fd) +{ + memset(tm, 0, sizeof(*tm)); + ioctl(fd, RTC_RD_TIME, tm); +} + +static void +writertctm(struct tm *tm, int fd) +{ + ioctl(fd, RTC_SET_TIME, tm); +} + +static void +writetime(char *dev) +{ + struct timeval tv; + struct tm *tm; + time_t t; + int fd; + + fd = open(dev, O_WRONLY); + if (fd < 0) + eprintf("open %s:", dev); + gettimeofday(&tv, NULL); + t = tv.tv_sec; + tm = gmtime(&t); + writertctm(tm, fd); + close(fd); +} diff --git a/rtc.h b/rtc.h @@ -0,0 +1,2 @@ +#define RTC_RD_TIME _IOR('p', 0x09, struct tm) /* Read RTC time */ +#define RTC_SET_TIME _IOW('p', 0x0a, struct tm) /* Set RTC time */