ebc610fcb3
The dosynctodr kernel variable needs to be set to 0 to block automatic
synchronization of the system clock to the hardware clock. chronyd used
to disable dosynctodr on Solaris versions before 2.6, but it seems it is
now needed even on current versions as the clock driver sets frequency
only without calling adjtime() or setting the ntp_adjtime() PLL offset.
This issue was reproduced and fix tested on current OpenIndiana.
Fixes: 8feb37df2b ("sys_solaris: use timex driver")
95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/*
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chronyd/chronyc - Programs for keeping computer clocks accurate.
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**********************************************************************
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* Copyright (C) Richard P. Curnow 1997-2003
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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**********************************************************************
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=======================================================================
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Driver file for Solaris operating system
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*/
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#include "config.h"
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#include "sysincl.h"
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#include "logging.h"
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#include "privops.h"
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#include "sys_solaris.h"
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#include "sys_timex.h"
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#include "util.h"
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#include <kvm.h>
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#include <nlist.h>
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/* ================================================== */
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static void
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set_dosynctodr(int on_off)
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{
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struct nlist nl[] = { {"dosynctodr"}, {NULL} };
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kvm_t *kt;
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kt = kvm_open(NULL, NULL, NULL, O_RDWR, NULL);
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if (!kt)
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LOG_FATAL("Could not open kvm");
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if (kvm_nlist(kt, nl) < 0 || !nl[0].n_value)
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LOG_FATAL("Could not get dosynctodr address");
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if (kvm_kwrite(kt, nl[0].n_value, &on_off, sizeof (on_off)) < 0)
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LOG_FATAL("Could not write to dosynctodr");
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kvm_close(kt);
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}
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/* ================================================== */
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void
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SYS_Solaris_Initialise(void)
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{
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/* The kernel keeps the system clock and hardware clock synchronised to each
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other. The dosynctodr variable needs to be set to zero to prevent the
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the system clock from following the hardware clock when the system clock
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is not adjusted by adjtime() or ntp_adjtime(modes=MOD_OFFSET). */
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set_dosynctodr(0);
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/* The kernel allows the frequency to be set in the full range off int32_t */
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SYS_Timex_InitialiseWithFunctions(32500, 1.0 / 100, NULL, NULL, NULL,
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0.0, 0.0, NULL, NULL);
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}
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/* ================================================== */
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void
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SYS_Solaris_Finalise(void)
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{
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SYS_Timex_Finalise();
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}
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/* ================================================== */
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#ifdef FEAT_PRIVDROP
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void
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SYS_Solaris_DropRoot(uid_t uid, gid_t gid, SYS_ProcessContext context)
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{
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if (context == SYS_MAIN_PROCESS)
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PRV_StartHelper();
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UTI_DropRoot(uid, gid);
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}
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#endif
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