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Add support for ADJ_SETOFFSET mode

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This adjtimex mode allows precise stepping of the system clock.
This commit is contained in:
Miroslav Lichvar
2011-06-09 12:55:28 +02:00
parent b088b70f82
commit 6ab3d1daa3
4 changed files with 87 additions and 15 deletions
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51
sys_linux.c
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@@ -115,6 +115,9 @@ static int have_readonly_adjtime;
adjustments. */
static int have_nanopll;
/* Flag indicating whether adjtimex() can step the clock */
static int have_setoffset;
/* ================================================== */
static void handle_end_of_slew(void *anything);
@@ -612,23 +615,29 @@ apply_step_offset(double offset)
abort_slew();
}
if (gettimeofday(&old_time, NULL) < 0) {
LOG_FATAL(LOGF_SysLinux, "gettimeofday() failed");
if (have_setoffset) {
if (TMX_ApplyStepOffset(-offset) < 0) {
LOG_FATAL(LOGF_SysLinux, "adjtimex() failed");
}
} else {
if (gettimeofday(&old_time, NULL) < 0) {
LOG_FATAL(LOGF_SysLinux, "gettimeofday() failed");
}
UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
if (settimeofday(&new_time, NULL) < 0) {
LOG_FATAL(LOGF_SysLinux, "settimeofday() failed");
}
if (gettimeofday(&old_time, NULL) < 0) {
LOG_FATAL(LOGF_SysLinux, "gettimeofday() failed");
}
UTI_DiffTimevalsToDouble(&err, &old_time, &new_time);
lcl_InvokeDispersionNotifyHandlers(fabs(err));
}
UTI_AddDoubleToTimeval(&old_time, -offset, &new_time);
if (settimeofday(&new_time, NULL) < 0) {
LOG_FATAL(LOGF_SysLinux, "settimeofday() failed");
}
if (gettimeofday(&old_time, NULL) < 0) {
LOG_FATAL(LOGF_SysLinux, "gettimeofday() failed");
}
UTI_DiffTimevalsToDouble(&err, &old_time, &new_time);
lcl_InvokeDispersionNotifyHandlers(fabs(err));
initiate_slew();
}
@@ -1010,6 +1019,13 @@ get_version_specific_details(void)
have_nanopll = 1;
}
/* ADJ_SETOFFSET support */
if (kernelvercmp(major, minor, patch, 2, 6, 39) < 0) {
have_setoffset = 0;
} else {
have_setoffset = 1;
}
/* Override freq_scale if it appears in conf file */
CNF_GetLinuxFreqScale(&set_config_freq_scale, &config_freq_scale);
if (set_config_freq_scale) {
@@ -1049,6 +1065,11 @@ SYS_Linux_Initialise(void)
have_nanopll = 0;
}
if (have_setoffset && TMX_TestStepOffset() < 0) {
LOG(LOGS_INFO, LOGF_SysLinux, "adjtimex() doesn't support ADJ_SETOFFSET");
have_setoffset = 0;
}
TMX_SetSync(CNF_GetRTCSync());
/* Read current kernel frequency */