summaryrefslogtreecommitdiffstats
path: root/sys_netbsd.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--sys_netbsd.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/sys_netbsd.c b/sys_netbsd.c
new file mode 100644
index 0000000..e1b99bb
--- /dev/null
+++ b/sys_netbsd.c
@@ -0,0 +1,158 @@
+/*
+ chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Richard P. Curnow 1997-2001
+ * Copyright (C) J. Hannken-Illjes 2001
+ * Copyright (C) Miroslav Lichvar 2015
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ **********************************************************************
+
+ =======================================================================
+
+ Driver file for the NetBSD and FreeBSD operating system.
+ */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include "sys_netbsd.h"
+#include "sys_timex.h"
+#include "logging.h"
+#include "privops.h"
+#include "util.h"
+
+/* Maximum frequency offset accepted by the kernel (in ppm) */
+#define MAX_FREQ 500.0
+
+/* Minimum assumed rate at which the kernel updates the clock frequency */
+#define MIN_TICK_RATE 100
+
+/* Interval between kernel updates of the adjtime() offset */
+#define ADJTIME_UPDATE_INTERVAL 1.0
+
+/* Maximum adjtime() slew rate (in ppm) */
+#define MAX_ADJTIME_SLEWRATE 5000.0
+
+/* Minimum offset adjtime() slews faster than MAX_FREQ */
+#define MIN_FASTSLEW_OFFSET 1.0
+
+/* ================================================== */
+
+/* Positive offset means system clock is fast of true time, therefore
+ slew backwards */
+
+static void
+accrue_offset(double offset, double corr_rate)
+{
+ struct timeval newadj, oldadj;
+ double doldadj;
+
+ UTI_DoubleToTimeval(-offset, &newadj);
+
+ if (PRV_AdjustTime(&newadj, &oldadj) < 0)
+ LOG_FATAL("adjtime() failed");
+
+ /* Add the old remaining adjustment if not zero */
+ doldadj = UTI_TimevalToDouble(&oldadj);
+ if (doldadj != 0.0) {
+ UTI_DoubleToTimeval(-offset + doldadj, &newadj);
+ if (PRV_AdjustTime(&newadj, NULL) < 0)
+ LOG_FATAL("adjtime() failed");
+ }
+}
+
+/* ================================================== */
+
+static void
+get_offset_correction(struct timespec *raw,
+ double *corr, double *err)
+{
+ struct timeval remadj;
+ double adjustment_remaining;
+#ifdef MACOSX
+ struct timeval tv = {0, 0};
+
+ if (PRV_AdjustTime(&tv, &remadj) < 0)
+ LOG_FATAL("adjtime() failed");
+
+ if (PRV_AdjustTime(&remadj, NULL) < 0)
+ LOG_FATAL("adjtime() failed");
+#else
+ if (PRV_AdjustTime(NULL, &remadj) < 0)
+ LOG_FATAL("adjtime() failed");
+#endif
+
+ adjustment_remaining = UTI_TimevalToDouble(&remadj);
+
+ *corr = adjustment_remaining;
+ if (err) {
+ if (*corr != 0.0)
+ *err = 1.0e-6 * MAX_ADJTIME_SLEWRATE / ADJTIME_UPDATE_INTERVAL;
+ else
+ *err = 0.0;
+ }
+}
+
+/* ================================================== */
+
+void
+SYS_NetBSD_Initialise(void)
+{
+ SYS_Timex_InitialiseWithFunctions(MAX_FREQ, 1.0 / MIN_TICK_RATE,
+ NULL, NULL, NULL,
+ MIN_FASTSLEW_OFFSET, MAX_ADJTIME_SLEWRATE,
+ accrue_offset, get_offset_correction);
+}
+
+/* ================================================== */
+
+void
+SYS_NetBSD_Finalise(void)
+{
+ SYS_Timex_Finalise();
+}
+
+/* ================================================== */
+
+#ifdef FEAT_PRIVDROP
+void
+SYS_NetBSD_DropRoot(uid_t uid, gid_t gid, SYS_ProcessContext context, int clock_control)
+{
+#ifdef NETBSD
+ int fd;
+#endif
+
+ /* On NetBSD the helper is used only for socket binding, but on FreeBSD
+ it's used also for setting and adjusting the system clock */
+ if (context == SYS_MAIN_PROCESS)
+ PRV_StartHelper();
+
+ UTI_DropRoot(uid, gid);
+
+#ifdef NETBSD
+ if (!clock_control)
+ return;
+
+ /* Check if we have write access to /dev/clockctl */
+ fd = open("/dev/clockctl", O_WRONLY);
+ if (fd < 0)
+ LOG_FATAL("Can't write to /dev/clockctl");
+ close(fd);
+#endif
+}
+#endif