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hwclock: fix sizeof bug (used it on pointer, not array); make --systohc exact

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function                                             old     new   delta
hwclock_main                                         329     428     +99
rtc_adjtime_is_utc                                   138     134      -4
edir                                                 365     354     -11
read_rtc                                              39      23     -16
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/3 up/down: 99/-31)             Total: 68 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-01-06 18:16:39 +01:00
parent 06667f21d6
commit 695fa51c80
4 changed files with 74 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
libbb/rtc.c
View File

@ -19,7 +19,7 @@ int FAST_FUNC rtc_adjtime_is_utc(void)
FILE *f = fopen_for_read(ADJTIME_PATH);
if (f) {
RESERVE_CONFIG_BUFFER(buffer, 128);
char buffer[128];
while (fgets(buffer, sizeof(buffer), f)) {
int len = strlen(buffer);
@ -35,8 +35,6 @@ int FAST_FUNC rtc_adjtime_is_utc(void)
}
}
fclose(f);
RELEASE_CONFIG_BUFFER(buffer);
}
return utc;

5
networking/tc.c
View File

@ -191,8 +191,8 @@ static int cbq_print_opt(struct rtattr *opt)
struct tc_cbq_wrropt *wrr = NULL;
struct tc_cbq_fopt *fopt = NULL;
struct tc_cbq_ovl *ovl = NULL;
const char * const error = "CBQ: too short %s opt";
RESERVE_CONFIG_BUFFER(buf, 64);
const char *const error = "CBQ: too short %s opt";
char buf[64];
if (opt == NULL)
goto done;
@ -272,7 +272,6 @@ static int cbq_print_opt(struct rtattr *opt)
}
}
done:
RELEASE_CONFIG_BUFFER(buf);
return 0;
}

3
runit/chpst.c
View File

@ -104,7 +104,7 @@ static NOINLINE void edir(const char *directory_name)
xchdir(directory_name);
dir = xopendir(".");
for (;;) {
RESERVE_CONFIG_BUFFER(buf, 256);
char buf[256];
char *tail;
int size;
@ -148,7 +148,6 @@ static NOINLINE void edir(const char *directory_name)
break;
}
xsetenv(d->d_name, buf);
RELEASE_CONFIG_BUFFER(buf);
}
closedir(dir);
if (fchdir(wdir) == -1)

94
util-linux/hwclock.c
View File

@ -27,27 +27,12 @@ static time_t read_rtc(int utc)
fd = rtc_xopen(&rtcname, O_RDONLY);
ret = rtc_read_time(fd, utc);
close(fd);
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
return ret;
}
static void write_rtc(time_t t, int utc)
{
struct tm tm;
int rtc = rtc_xopen(&rtcname, O_WRONLY);
if (utc)
gmtime_r(&t, &tm);
else
localtime_r(&t, &tm);
tm.tm_isdst = 0;
xioctl(rtc, RTC_SET_TIME, &tm);
close(rtc);
}
static void show_clock(int utc)
{
//struct tm *ptm;
@ -58,10 +43,10 @@ static void show_clock(int utc)
//ptm = localtime(&t); /* Sets 'tzname[]' */
cp = ctime(&t);
if (cp[0])
cp[strlen(cp) - 1] = '\0';
strchrnul(cp, '\n')[0] = '\0';
//printf("%s %.6f seconds %s\n", cp, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
//printf("%s 0.000000 seconds %s\n", cp, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
/* 0.000000 stand for unimplemented difference between RTC and system clock */
printf("%s 0.000000 seconds\n", cp);
}
@ -81,12 +66,73 @@ static void to_sys_clock(int utc)
static void from_sys_clock(int utc)
{
#define TWEAK_USEC 200
struct tm tm;
struct timeval tv;
unsigned adj = TWEAK_USEC;
int rtc = rtc_xopen(&rtcname, O_WRONLY);
gettimeofday(&tv, NULL);
//if (gettimeofday(&tv, NULL))
// bb_perror_msg_and_die("gettimeofday() failed");
write_rtc(tv.tv_sec, utc);
/* Try to catch the moment when whole second is close */
while (1) {
unsigned rem_usec;
time_t t;
gettimeofday(&tv, NULL);
rem_usec = 1000000 - tv.tv_usec;
if (rem_usec < 1024) {
/* Less than 1ms to next second. Good enough */
small_rem:
tv.tv_sec++;
}
/* Prepare tm */
t = tv.tv_sec;
if (utc)
gmtime_r(&t, &tm); /* may read /etc/xxx (it takes time) */
else
localtime_r(&t, &tm); /* same */
tm.tm_isdst = 0;
/* gmtime/localtime took some time, re-get cur time */
gettimeofday(&tv, NULL);
if (tv.tv_sec < t /* may happen if rem_usec was < 1024 */
|| (tv.tv_sec == t && tv.tv_usec < 1024)
) {
/* We are not too far into next second. Good. */
break;
}
adj += 32; /* 2^(10-5) = 2^5 = 32 iterations max */
if (adj >= 1024) {
/* Give up trying to sync */
break;
}
/* Try to sync up by sleeping */
rem_usec = 1000000 - tv.tv_usec;
if (rem_usec < 1024) {
goto small_rem; /* already close, don't sleep */
}
/* Need to sleep.
* Note that small adj on slow processors can make us
* to always overshoot tv.tv_usec < 1024 check on next
* iteration. That's why adj is increased on each iteration.
* This also allows it to be reused as a loop limiter.
*/
usleep(rem_usec - adj);
}
xioctl(rtc, RTC_SET_TIME, &tm);
/* Debug aid to find "good" TWEAK_USEC.
* Look for a value which makes tv_usec close to 999999 or 0.
* for 2.20GHz Intel Core 2: TWEAK_USEC ~= 200
*/
//bb_error_msg("tv.tv_usec:%d adj:%d", (int)tv.tv_usec, adj);
if (ENABLE_FEATURE_CLEAN_UP)
close(rtc);
}
#define HWCLOCK_OPT_LOCALTIME 0x01