[9front] stats: resilience to machine disconnections

[rgl@antares-labs.eu]

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hi everyone,


the following is a patch to allow stats(1) to reconnect
to a machine that went awol, be it for network or other issues.

i don't think it's the best procedure, especially given how it
blocks the Mainproc, although it does the job for me and my
usual monitoring-after-reboot needs.

if any of you have a better method (to keep the graphs drawing
would be neat), please let me know. i'll keep fiddling with it
when i have more time.



best,

-rodri


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--- //.git/fs/object/658757abed7be283e06bae3b1722fc2703334d74/tree//sys/src/cmd/stats.c
+++ /sys/src/cmd/stats.c
@@ -550,6 +550,20 @@
 	return i;
 }
 
+char*
+delmachine(Machine *m)
+{
+	free(m->shortname);
+	close(m->statsfd);
+	close(m->swapfd);
+	close(m->etherfd);
+	close(m->ifstatsfd);
+	close(m->batteryfd);
+	close(m->bitsybatfd);
+	close(m->tempfd);
+	return m->name;
+}
+
 int
 initmach(Machine *m, char *name)
 {
@@ -717,11 +731,15 @@
 {
 	int n, i;
 	uvlong a[nelem(m->devsysstat)];
-	char buf[32];
+	char buf[32], *machname;
 
 	if(m->remote && (m->disable || setjmp(catchalarm))){
-		if (m->disable++ >= 5)
+		if (m->disable++ >= 5){
 			m->disable = 0; /* give it another chance */
+			machname = delmachine(m);
+			initmach(m, machname);
+			free(machname);
+		}
 		memmove(m->devsysstat, m->prevsysstat, sizeof m->devsysstat);
 		memmove(m->netetherstats, m->prevetherstats, sizeof m->netetherstats);
 		return;