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Implement -s support for hwclock(8)

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Rename some functions as well.
This commit is contained in:
sin 2014-06-03 15:52:45 +01:00
parent cd0c6cf5b8
commit 5836145a5c
1 changed files with 50 additions and 23 deletions
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73
hwclock.c
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@ -12,15 +12,16 @@
#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 show(char *);
static void hctosys(char *);
static void systohc(char *);
static void
usage(void)
{
eprintf("usage: %s [-rw] [-u]\n", argv0);
eprintf("usage: %s [-rsw] [-u]\n", argv0);
}
int
@ -28,12 +29,16 @@ main(int argc, char *argv[])
{
char *dev = "/dev/rtc";
int rflag = 0;
int sflag = 0;
int wflag = 0;
ARGBEGIN {
case 'r':
rflag = 1;
break;
case 's':
sflag = 1;
break;
case 'w':
wflag = 1;
break;
@ -43,7 +48,7 @@ main(int argc, char *argv[])
usage();
} ARGEND;
if ((rflag ^ wflag) == 0)
if ((rflag ^ sflag ^ wflag) == 0)
eprintf("missing or incompatible function\n");
/* Only UTC support at the moment */
@ -51,29 +56,15 @@ main(int argc, char *argv[])
tzset();
if (rflag == 1)
echotime(dev);
show(dev);
else if (sflag == 1)
hctosys(dev);
else if (wflag == 1)
writetime(dev);
systohc(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)
{
@ -110,7 +101,43 @@ writertctm(struct tm *tm, int fd)
}
static void
writetime(char *dev)
show(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
hctosys(char *dev)
{
struct timeval tv;
struct tm tm;
int r;
int fd;
fd = open(dev, O_RDONLY);
if (fd < 0)
eprintf("open %s:", dev);
readrtctm(&tm, fd);
tv.tv_sec = mktime(&tm);
tv.tv_usec = 0;
r = settimeofday(&tv, NULL);
if (r < 0)
eprintf("settimeofday:");
close(fd);
}
static void
systohc(char *dev)
{
struct timeval tv;
struct tm *tm;