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Add a SIGINFO handler to devd. It will send useful statistics to syslog or

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stderr as appropriate.  Currently, the only statistic printed is the number of
events received.

Reviewed by:	eadler
Approved by:	gibbs (co-mentor)
This commit is contained in:
Alan Somers 2013-07-01 21:33:05 +00:00
parent 6d1014a32b
commit be685e0128
1 changed files with 19 additions and 0 deletions
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19
sbin/devd/devd.cc
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@ -117,6 +117,8 @@ static struct pidfh *pfh;
int dflag;
int nflag;
static unsigned total_events = 0;
static volatile sig_atomic_t got_siginfo = 0;
static volatile sig_atomic_t romeo_must_die = 0;
static const char *configfile = CF;
@ -965,6 +967,11 @@ event_loop(void)
tv.tv_usec = 0;
}
rv = select(max_fd, &fds, NULL, NULL, &tv);
if (got_siginfo) {
devdlog(LOG_INFO, "Events received so far=%ld\n",
total_events);
got_siginfo = 0;
}
if (rv == -1) {
if (errno == EINTR)
continue;
@ -974,6 +981,7 @@ event_loop(void)
if (FD_ISSET(fd, &fds)) {
rv = read(fd, buffer, sizeof(buffer) - 1);
if (rv > 0) {
total_events++;
if (rv == sizeof(buffer) - 1) {
devdlog(LOG_WARNING, "Warning: "
"available event data exceeded "
@ -1090,6 +1098,16 @@ gensighand(int)
romeo_must_die = 1;
}
/*
* SIGINFO handler. Will print useful statistics to the syslog or stderr
* as appropriate
*/
static void
siginfohand(int)
{
got_siginfo = 1;
}
/*
* Local logging function. Prints to syslog if we're daemonized; syslog
* otherwise.
@ -1169,6 +1187,7 @@ main(int argc, char **argv)
signal(SIGHUP, gensighand);
signal(SIGINT, gensighand);
signal(SIGTERM, gensighand);
signal(SIGINFO, siginfohand);
event_loop();
return (0);
}