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-rw-r--r--toys/pending/hwclock.c178
1 files changed, 75 insertions, 103 deletions
diff --git a/toys/pending/hwclock.c b/toys/pending/hwclock.c
index 003174f7..5ca035aa 100644
--- a/toys/pending/hwclock.c
+++ b/toys/pending/hwclock.c
@@ -2,9 +2,9 @@
*
* Copyright 2014 Bilal Qureshi <bilal.jmi@gmail.com>
*
- * No Standard.
+ * No standard, but see Documentation/rtc.txt in the linux kernel source..
*
-USE_HWCLOCK(NEWTOY(hwclock, ">0(fast)f(rtc):u(utc)l(localtime)t(systz)w(systohc)s(hctosys)r(show)[!ul][!rsw]", TOYFLAG_USR|TOYFLAG_BIN))
+USE_HWCLOCK(NEWTOY(hwclock, ">0(fast)f(rtc):u(utc)l(localtime)t(systz)w(systohc)s(hctosys)r(show)[-ul][!rtsw]", TOYFLAG_USR|TOYFLAG_BIN))
config HWCLOCK
bool "hwclock"
@@ -12,7 +12,7 @@ config HWCLOCK
help
usage: hwclock [-rswtluf]
- -f FILE Use specified device file instead of /dev/rtc (--show)
+ -f FILE Use specified device file instead of /dev/rtc (--rtc)
-l Hardware clock uses localtime (--localtime)
-r Show hardware clock time (--show)
-s Set system time from hardware clock (--hctosys)
@@ -20,6 +20,7 @@ config HWCLOCK
-u Hardware clock uses UTC (--utc)
-w Set hardware clock from system time (--systohc)
*/
+
#define FOR_hwclock
#include "toys.h"
#include <linux/rtc.h>
@@ -30,7 +31,7 @@ GLOBALS(
int utc;
)
-static int check_hctosys(struct dirtree* node)
+static int rtc_find(struct dirtree* node)
{
FILE *fp;
@@ -39,147 +40,118 @@ static int check_hctosys(struct dirtree* node)
snprintf(toybuf, sizeof(toybuf), "/sys/class/rtc/%s/hctosys", node->name);
fp = fopen(toybuf, "r");
if (fp) {
- int hctosys = 0;
- int items = fscanf(fp, "%d", &hctosys);
+ int hctosys = 0, items = fscanf(fp, "%d", &hctosys);
+
fclose(fp);
if (items == 1 && hctosys == 1) {
snprintf(toybuf, sizeof(toybuf), "/dev/%s", node->name);
TT.fname = toybuf;
+
return DIRTREE_ABORT;
}
}
- return 0;
-}
-// Search /sys/class/rtc for the RTC that the system clock is set from.
-// See the kernel's Documentation/rtc.txt.
-static int open_wall_clock_rtc(int flag)
-{
- TT.fname = NULL;
- dirtree_read("/sys/class/rtc", check_hctosys);
- return TT.fname ? xopen(TT.fname, flag) : -1;
+ return 0;
}
+// Your system should have a /dev/rtc symlink. If your system is misconfigured,
+// search /sys/class/rtc for RTC system clock set from, then try /dev/misc/rtc.
static int rtc_open(int flag)
{
if (!TT.fname) {
int fd;
if ((fd = open((TT.fname = "/dev/rtc"), flag)) != -1) return fd;
- else if ((fd = open_wall_clock_rtc(flag)) != -1) return fd;
- else TT.fname = "/dev/misc/rtc";
+ TT.fname = 0;
+ dirtree_read("/sys/class/rtc", rtc_find);
+ if (TT.fname) return xopen(TT.fname, flag);
+ TT.fname = "/dev/misc/rtc";
}
+
return xopen(TT.fname, flag);
}
-static time_t get_rtc()
+// Get current time in seconds from rtc device. We could get subsecond time by
+// waiting for next time change, but haven't implemented that yet.
+static time_t get_rtc_seconds()
{
struct tm time;
time_t tm;
- char *ptz_old = 0;
+ char *ptz_old = ptz_old;
int fd = rtc_open(O_RDONLY);
xioctl(fd, RTC_RD_TIME, &time);
close(fd);
- if (TT.utc) {
- ptz_old = getenv("TZ");
- if (putenv((char*)"TZ=UTC0")) perror_exit("putenv");
- tzset();
- }
+
+ if (TT.utc) ptz_old = xtzset("UTC0");
if ((tm = mktime(&time)) < 0) error_exit("mktime failed");
if (TT.utc) {
- if (unsetenv("TZ") < 0) perror_exit("unsetenv");
- if (ptz_old && putenv(ptz_old - 3)) perror_exit("putenv");
- tzset();
+ free(xtzset(ptz_old));
+ free(ptz_old);
}
- return tm;
-}
-static void set_sysclock_from_hwclock()
-{
- struct timezone tmzone;
- struct timeval tmval;
-
- tmzone.tz_minuteswest = timezone / 60 - 60 * daylight;
- tmzone.tz_dsttime = 0;
- tmval.tv_sec = get_rtc();
- tmval.tv_usec = 0;
- if (settimeofday(&tmval, &tmzone) < 0) perror_exit("settimeofday");
-}
-
-static void set_hwclock_from_sysclock()
-{
- struct timeval tmval;
- struct tm time;
- int fd = rtc_open(O_WRONLY);
-
- if (gettimeofday(&tmval, NULL) < 0) perror_exit("gettimeofday");
- // converting a time value to broken-down UTC time
- if (TT.utc && !gmtime_r((time_t*)&tmval.tv_sec, &time))
- error_exit("gmtime_r failed");
- // converting a time value to a broken-down localtime
- else if (!(localtime_r((time_t*)&tmval.tv_sec, &time)))
- error_exit("localtime_r failed");
-
- /* The value of tm_isdst will positive if daylight saving time is in effect,
- * zero if it is not and negative if the information is not available.
- * */
- time.tm_isdst = 0;
- xioctl(fd, RTC_SET_TIME, &time);
- close(fd);
-}
-
-static void set_sysclock_timezone()
-{
- struct timezone tmzone;
- struct timeval tmval;
- struct tm *pb;
-
- if (gettimeofday(&tmval, NULL) < 0) perror_exit("gettimeofday");
- if (!(pb = localtime(&tmval.tv_sec))) error_exit("localtime failed");
- // extern long timezone => defined in header sys/time.h
- tmzone.tz_minuteswest = timezone / 60;
- if (pb->tm_isdst) tmzone.tz_minuteswest -= 60;
- tmzone.tz_dsttime = 0; // daylight saving time is not in effect
- if (gettimeofday(&tmval, NULL) < 0) perror_exit("gettimeofday");
- if (!TT.utc) tmval.tv_sec += tmzone.tz_minuteswest * 60;
- if (settimeofday(&tmval, &tmzone) < 0) perror_exit("settimeofday");
+ return tm;
}
void hwclock_main()
{
- // check for UTC
- if (!(toys.optflags & FLAG_u)) {
+ struct timezone tzone;
+ struct timeval timeval;
+
+ // check for Grenich Mean Time
+ if (toys.optflags & FLAG_u) TT.utc = 1;
+ else {
FILE *fp = fopen("/etc/adjtime", "r");
if (fp) {
- char *line = NULL;
- size_t st;
-
- while (0 < getline(&line, &st, fp)) {
- if (!strncmp(line, "UTC", 3)) {
- TT.utc = 1;
- break;
- }
+ for (;;) {
+ char *line = 0;
+
+ if (getline(&line, (void *)toybuf, fp) <= 0) break;
+ TT.utc += !strncmp(line, "UTC", 3);
free(line);
}
fclose(fp);
}
- } else TT.utc = 1;
-
- if (toys.optflags & FLAG_w) set_hwclock_from_sysclock();
- else if (toys.optflags & FLAG_s) set_sysclock_from_hwclock();
- else if (toys.optflags & FLAG_t) set_sysclock_timezone();
- else if ((toys.optflags & FLAG_r) || (toys.optflags & FLAG_l)
- || !*toys.optargs)
- {
- time_t tm = get_rtc();
- char *s, *pctm = ctime(&tm);
-
- // ctime() is defined as equivalent to asctime(localtime(t)),
- // which is defined to overflow its buffer rather than return NULL.
- // if (!pctm) error_exit("can't happen");
- if ((s = strrchr(pctm, '\n'))) *s = '\0';
+ }
+
+ if (toys.optflags & FLAG_w) {
+ struct tm tm;
+ int fd = rtc_open(O_WRONLY);
+
+ if (gettimeofday(&timeval, 0)) perror_exit("gettimeofday");
+ if ((TT.utc ? gmtime_r : localtime_r)(&timeval.tv_sec, &tm))
+ error_exit("timeval");
+
+ /* The value of tm_isdst will positive if daylight saving time is in effect,
+ * zero if it is not and negative if the information is not available.
+ * */
+ tm.tm_isdst = 0;
+ xioctl(fd, RTC_SET_TIME, &time);
+ close(fd);
+ } else if (toys.optflags & FLAG_s) {
+ tzone.tz_minuteswest = timezone / 60 - 60 * daylight;
+ tzone.tz_dsttime = 0;
+ timeval.tv_sec = get_rtc_seconds();
+ timeval.tv_usec = 0;
+ if (settimeofday(&timeval, &tzone) < 0) perror_exit("settimeofday");
+ } else if (toys.optflags & FLAG_t) {
+ struct tm *pb;
+
+ if (gettimeofday(&timeval, NULL) < 0) perror_exit("gettimeofday");
+ if (!(pb = localtime(&timeval.tv_sec))) error_exit("localtime failed");
+ // extern long timezone is defined in header sys/time.h
+ tzone.tz_minuteswest = timezone / 60;
+ if (pb->tm_isdst) tzone.tz_minuteswest -= 60;
+ tzone.tz_dsttime = 0; // daylight saving time is not in effect
+ if (gettimeofday(&timeval, NULL) < 0) perror_exit("gettimeofday");
+ if (!TT.utc) timeval.tv_sec += tzone.tz_minuteswest * 60;
+ if (settimeofday(&timeval, &tzone) < 0) perror_exit("settimeofday");
+ } else {
+ time_t tm = get_rtc_seconds();
+ char *pctm = ctime(&tm), *s = strrchr(pctm, '\n');
+
+ if (s) *s = '\0';
// TODO: implement this.
xprintf("%s 0.000000 seconds\n", pctm);
}