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sys: add sync status setting to generic and Linux driver

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Set the adjtimex status, esterror and maxerror fields to the values
provided by the reference module.
This commit is contained in:
Miroslav Lichvar
2014-12-09 17:31:10 +01:00
parent 2645e632a8
commit 02cbe5e1ad
5 changed files with 54 additions and 17 deletions
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30
sys_linux.c
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@@ -58,6 +58,9 @@ int LockAll = 0;
#include "logging.h"
#include "wrap_adjtimex.h"
/* The threshold for adjtimex maxerror when the kernel sets the UNSYNC flag */
#define UNSYNC_MAXERROR 16.0
/* This is the uncompensated system tick value */
static int nominal_tick;
@@ -181,6 +184,29 @@ set_leap(int leap)
/* ================================================== */
static void
set_sync_status(int synchronised, double est_error, double max_error)
{
if (synchronised) {
if (est_error > UNSYNC_MAXERROR)
est_error = UNSYNC_MAXERROR;
if (max_error >= UNSYNC_MAXERROR) {
max_error = UNSYNC_MAXERROR;
synchronised = 0;
}
} else {
est_error = max_error = UNSYNC_MAXERROR;
}
/* Clear the UNSYNC flag only if rtcsync is enabled */
if (!CNF_GetRtcSync())
synchronised = 0;
TMX_SetSync(synchronised, est_error, max_error);
}
/* ================================================== */
/* Estimate the value of USER_HZ given the value of txc.tick that chronyd finds when
* it starts. The only credible values are 100 (Linux/x86) or powers of 2.
* Also, the bounds checking inside the kernel's adjtimex system call enforces
@@ -334,13 +360,11 @@ SYS_Linux_Initialise(void)
have_setoffset = 0;
}
TMX_SetSync(CNF_GetRtcSync());
SYS_Generic_CompleteFreqDriver(1.0e6 * max_tick_bias / nominal_tick,
1.0 / tick_update_hz,
read_frequency, set_frequency,
have_setoffset ? apply_step_offset : NULL,
set_leap, NULL);
set_leap, set_sync_status);
}
/* ================================================== */