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timemaster: add option to specify first SHM segment. 

This allows using a sequence of SHM segments that starts with a number
larger than zero, which can be useful to avoid conflicts with time
sources that are not started by timemaster, e.g. gpsd using segments
number 0 and 1.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
master
Miroslav Lichvar 2016-07-14 13:43:47 +02:00 committed by Richard Cochran
parent ac77099493
commit 395544d117
2 changed files with 21 additions and 1 deletions
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8
timemaster.8
View File

@ -80,6 +80,13 @@ Specify the directory where should be generated \fBchronyd\fR, \fBntpd\fR and
\fBptp4l\fR configuration files and sockets. The directory will be created if
it doesn't exist. The default value is \fB/var/run/timemaster\fR.
.TP
.B first_shm_segment
Specify the first number in a sequence of SHM segments that will be used by
\fBptp4l\fR and \fBphc2sys\fR. The default value is 0. Increasing the number
can be useful to avoid conflicts with time sources that are not started by
\fBtimemaster\fR, e.g. \fBgpsd\fR using segments number 0 and 1.
.SS [ntp_server address]
The \fBntp_server\fR section specifies an NTP server that should be used as a
@ -310,6 +317,7 @@ ptp4l_option delay_mechanism P2P
[timemaster]
ntp_program chronyd
rundir /var/run/timemaster
first_shm_segment 1
[chronyd]
path /usr/sbin/chronyd

14
timemaster.c
View File

@ -41,6 +41,8 @@
#define DEFAULT_RUNDIR "/var/run/timemaster"
#define DEFAULT_FIRST_SHM_SEGMENT 0
#define DEFAULT_NTP_PROGRAM CHRONYD
#define DEFAULT_NTP_MINPOLL 6
#define DEFAULT_NTP_MAXPOLL 10
@ -103,6 +105,7 @@ struct timemaster_config {
struct source **sources;
enum ntp_program ntp_program;
char *rundir;
int first_shm_segment;
struct program_config chronyd;
struct program_config ntpd;
struct program_config phc2sys;
@ -363,6 +366,7 @@ static int parse_timemaster_settings(char **settings,
struct timemaster_config *config)
{
char *name, *value;
int r = 0;
for (; *settings; settings++) {
parse_setting(*settings, &name, &value);
@ -377,10 +381,16 @@ static int parse_timemaster_settings(char **settings,
}
} else if (!strcasecmp(name, "rundir")) {
replace_string(value, &config->rundir);
} else if (!strcasecmp(name, "first_shm_segment")) {
r = parse_int(value, &config->first_shm_segment);
} else {
pr_err("unknown timemaster setting %s", name);
return 1;
}
if (r) {
pr_err("invalid value %s for %s", value, name);
return 1;
}
}
return 0;
@ -495,6 +505,7 @@ static struct timemaster_config *config_parse(char *path)
config->sources = (struct source **)parray_new();
config->ntp_program = DEFAULT_NTP_PROGRAM;
config->rundir = xstrdup(DEFAULT_RUNDIR);
config->first_shm_segment = DEFAULT_FIRST_SHM_SEGMENT;
init_program_config(&config->chronyd, "chronyd",
NULL, DEFAULT_CHRONYD_SETTINGS, NULL);
@ -876,12 +887,13 @@ static struct script *script_create(struct timemaster_config *config)
struct source *source, **sources;
struct config_file *ntp_config = NULL;
int **allocated_phcs = (int **)parray_new();
int ret = 0, shm_segment = 0;
int ret = 0, shm_segment;
script->configs = (struct config_file **)parray_new();
script->commands = (char ***)parray_new();
ntp_config = add_ntp_program(config, script);
shm_segment = config->first_shm_segment;
for (sources = config->sources; (source = *sources); sources++) {
switch (source->type) {