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Make kern.rtc_offset writable at securelevel <= 0. 

This allows boot-time adjustment when a machine runs other OSes with
RTC == localtime.
This commit is contained in:
martin 2003-12-26 23:49:39 +00:00
parent d59fb7b8a3
commit be59b63fe2
1 changed files with 39 additions and 3 deletions
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42
sys/kern/init_sysctl.c
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@ -1,4 +1,4 @@
/* $NetBSD: init_sysctl.c,v 1.13 2003/12/20 07:33:03 yamt Exp $ */
/* $NetBSD: init_sysctl.c,v 1.14 2003/12/26 23:49:39 martin Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
@ -113,6 +113,7 @@ sysctl_ncpus(void)
#endif /* MULTIPROCESSOR */
static int sysctl_kern_maxvnodes(SYSCTLFN_PROTO);
static int sysctl_kern_rtc_offset(SYSCTLFN_PROTO);
static int sysctl_kern_maxproc(SYSCTLFN_PROTO);
static int sysctl_kern_securelevel(SYSCTLFN_PROTO);
static int sysctl_kern_hostid(SYSCTLFN_PROTO);
@ -338,9 +339,9 @@ SYSCTL_SETUP(sysctl_kern_setup, "sysctl kern subtree setup")
CTLTYPE_INT, "autoniceval", NULL,
sysctl_kern_autonice, 0, &autoniceval, 0,
CTL_KERN, KERN_AUTONICEVAL, CTL_EOL);
sysctl_createv(SYSCTL_PERMANENT,
sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
CTLTYPE_INT, "rtc_offset", NULL,
NULL, 0, &rtc_offset, 0,
sysctl_kern_rtc_offset, 0, &rtc_offset, 0,
CTL_KERN, KERN_RTC_OFFSET, CTL_EOL);
sysctl_createv(SYSCTL_PERMANENT,
CTLTYPE_STRING, "root_device", NULL,
@ -752,6 +753,41 @@ sysctl_kern_maxvnodes(SYSCTLFN_ARGS)
return (0);
}
/*
* sysctl helper routine for rtc_offset - set time after changes
*/
static int
sysctl_kern_rtc_offset(SYSCTLFN_ARGS)
{
struct timeval tv, delta;
int s, error, new_rtc_offset;
struct sysctlnode node;
new_rtc_offset = rtc_offset;
node = *rnode;
node.sysctl_data = &new_rtc_offset;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);
if (securelevel > 0)
return (EPERM);
if (rtc_offset == new_rtc_offset)
return (0);
/* if we change the offset, adjust the time */
s = splclock();
tv = time;
splx(s);
delta.tv_sec = 60*(new_rtc_offset - rtc_offset);
delta.tv_usec = 0;
timeradd(&tv, &delta, &tv);
rtc_offset = new_rtc_offset;
settime(&tv);
return (0);
}
/*
* sysctl helper routine for kern.maxvnodes. ensures that the new
* values are not too low or too high.