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dmeventd: info status report

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To quickly get info about some internal dmeventd status,
implment   'dmeventd -i' support.

Reported messages are some 'raw' internal informations mainly
useful to developers.
This commit is contained in:
Zdenek Kabelac 2023-09-25 11:49:14 +02:00
parent 637d812df5
commit 80d34abf49
2 changed files with 74 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
daemons/dmeventd/dmeventd.c
View File

@ -2065,6 +2065,68 @@ static int _reinstate_registrations(struct dm_event_fifos *fifos)
return 1;
}
static int _info_dmeventd(const char *name, struct dm_event_fifos *fifos)
{
struct dm_event_daemon_message msg = { 0 };
int i, count = 0;
char *line;
int version;
int ret = 0;
/* Get the list of registrations from the running daemon. */
if (!init_fifos(fifos)) {
fprintf(stderr, "Could not initiate communication with existing dmeventd.\n");
return 0;
}
if (!dm_event_get_version(fifos, &version)) {
fprintf(stderr, "Could not communicate with existing dmeventd.\n");
goto out;
}
if (version < 1) {
fprintf(stderr, "The running dmeventd instance is too old.\n"
"Protocol version %d (required: 1). Action cancelled.\n", version);
goto out;
}
if (daemon_talk(fifos, &msg, DM_EVENT_CMD_GET_STATUS, "-", "-", 0, 0)) {
fprintf(stderr, "Failed to acquire status from existing dmeventd.\n");
goto out;
}
line = strchr(msg.data, ' ') + 1;
for (i = 0; msg.data[i]; ++i)
if (msg.data[i] == ';') {
msg.data[i] = 0;
if (!count)
printf("%s is monitoring:\n", name);
printf("%s\n", line);
line = msg.data + i + 1;
++count;
}
free(msg.data);
if (!count)
printf("%s does not monitor any device.\n", name);
if (version >= 2) {
if (daemon_talk(fifos, &msg, DM_EVENT_CMD_GET_PARAMETERS, "-", "-", 0, 0)) {
fprintf(stderr, "Failed to acquire parameters from existing dmeventd.\n");
goto out;
}
printf("%s internal status: %s\n", name, msg.data);
free(msg.data);
}
ret = 1;
out:
fini_fifos(fifos);
return ret;
}
static void _restart_dmeventd(void)
{
struct dm_event_fifos fifos = {
@ -2180,10 +2242,11 @@ bad:
static void _usage(char *prog, FILE *file)
{
fprintf(file, "Usage:\n"
"%s [-d [-d [-d]]] [-f] [-h] [-l] [-R] [-V] [-?]\n\n"
"%s [-d [-d [-d]]] [-f] [-h] [i] [-l] [-R] [-V] [-?]\n\n"
" -d Log debug messages to syslog (-d, -dd, -ddd)\n"
" -f Don't fork, run in the foreground\n"
" -h Show this help information\n"
" -i Query running instance of dmeventd for info\n"
" -l Log to stdout,stderr instead of syslog\n"
" -? Show this help information on stderr\n"
" -R Restart dmeventd\n"
@ -2203,7 +2266,7 @@ int main(int argc, char *argv[])
optopt = optind = opterr = 0;
optarg = (char*) "";
while ((opt = getopt(argc, argv, "?fhVdlR")) != EOF) {
while ((opt = getopt(argc, argv, "?fhiVdlR")) != EOF) {
switch (opt) {
case 'h':
_usage(argv[0], stdout);
@ -2211,6 +2274,8 @@ int main(int argc, char *argv[])
case '?':
_usage(argv[0], stderr);
return EXIT_SUCCESS;
case 'i':
return _info_dmeventd(argv[0], &fifos) ? EXIT_SUCCESS : EXIT_FAILURE;
case 'R':
_restart++;
break;

7
man/dmeventd.8_main
View File

@ -12,6 +12,7 @@ dmeventd \(em Device-mapper event daemon
.RB [ -d ]]]
.RB [ -f ]
.RB [ -h ]
.RB [ -i ]
.RB [ -l ]
.RB [ -R ]
.RB [ -V ]
@ -44,6 +45,12 @@ Don't fork, run in the foreground.
Show help information.
.
.TP
.B -i
Query the running daemon instance for the status informations. The format is
internal and unstable and it is targeted for developers.
Format may change between versions.
.
.TP
.B -l
Log through stdout and stderr instead of syslog.
This option works only with option -f, otherwise it is ignored.