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rewritted to use sysctl, no more /var/run/.adjkerntz now

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This commit is contained in:
Andrey A. Chernov 1994-09-19 23:09:34 +00:00
parent 075e8696f8
commit bb84bd5c6b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=2910
3 changed files with 26 additions and 39 deletions
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1
sbin/adjkerntz/Makefile
View File

@ -1,4 +1,5 @@
PROG= adjkerntz
MAN8= adjkerntz.8
CFLAGS+= -Wall
.include <bsd.prog.mk>

57
sbin/adjkerntz/adjkerntz.c
View File

@ -45,11 +45,12 @@ char copyright[] =
#include <unistd.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/param.h>
#include <machine/cpu.h>
#include <sys/sysctl.h>
#include "pathnames.h"
char storage[] = _PATH_OFFSET;
int main(argc, argv)
int argc;
char **argv;
@ -57,11 +58,13 @@ int main(argc, argv)
struct tm local, utc;
struct timeval tv, *stv;
struct timezone tz, *stz;
int kern_offset;
size_t len;
int mib[2];
/* Avoid time_t here, can be unsigned long or worse */
long offset, oldoffset, utcsec, localsec, diff;
long offset, utcsec, localsec, diff;
time_t initial_sec, final_sec;
int ch, init = -1, verbose = 0;
FILE *f;
while ((ch = getopt(argc, argv, "aiv")) != EOF)
switch((char)ch) {
@ -93,20 +96,13 @@ int main(argc, argv)
/* Restore saved offset */
if (!init) {
if ((f = fopen(storage, "r")) == NULL) {
perror(storage);
mib[0] = CTL_MACHDEP;
mib[1] = CPU_ADJKERNTZ;
len = sizeof(kern_offset);
if (sysctl(mib, 2, &kern_offset, &len, NULL, 0) == -1) {
perror("sysctl(get_offset)");
return 1;
}
if (fscanf(f, "%ld", &oldoffset) != 1) {
fprintf(stderr, "Misformatted offset in %s\n",
storage);
return 1;
}
(void) fclose(f);
}
else
oldoffset = 0;
/****** Critical section, do all things as fast as possible ******/
@ -142,7 +138,7 @@ int main(argc, argv)
/* correct the kerneltime for this diffs */
/* subtract kernel offset, if present, old offset too */
diff = offset - tz.tz_minuteswest * 60 - oldoffset;
diff = offset - tz.tz_minuteswest * 60 - kern_offset;
if (diff != 0) {
@ -172,7 +168,7 @@ int main(argc, argv)
/* correct the kerneltime for this diffs */
/* subtract kernel offset, if present, old offset too */
diff = offset - tz.tz_minuteswest * 60 - oldoffset;
diff = offset - tz.tz_minuteswest * 60 - kern_offset;
if (diff != 0) {
tv.tv_sec += diff;
@ -185,6 +181,17 @@ int main(argc, argv)
else
stv = NULL;
if (kern_offset != offset) {
kern_offset = offset;
mib[0] = CTL_MACHDEP;
mib[1] = CPU_ADJKERNTZ;
len = sizeof(kern_offset);
if (sysctl(mib, 2, NULL, NULL, &kern_offset, len) == -1) {
perror("sysctl(update_offset)");
return 1;
}
}
if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
tz.tz_dsttime = tz.tz_minuteswest = 0; /* zone info is garbage */
stz = &tz;
@ -205,20 +212,6 @@ int main(argc, argv)
printf("Calculated zone offset difference: %ld seconds\n",
diff);
if (offset != oldoffset) {
(void) umask(022);
/* Save offset for next calls from crontab */
if ((f = fopen(storage, "w")) == NULL) {
perror(storage);
return 1;
}
fprintf(f, "%ld\n", offset);
if (fclose(f)) {
perror(storage);
return 1;
}
}
return 0;
}

7
sbin/adjkerntz/pathnames.h
View File

@ -26,11 +26,4 @@
#include <paths.h>
/*
* Offset file name started with '.', because "adjkerntz -i"
* called in /etc/rc before cleaning '*' in /var/run,
* and this file should be keeped after it.
*/
#define _PATH_OFFSET "/var/run/.adjkerntz"
#define _PATH_CLOCK "/etc/wall_cmos_clock"