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/*
* watchdog framework
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
enum {
Qdir,
Qwdctl,
};
static Watchdog *wd;
static Dirtab wddir[] = {
".", { Qdir, 0, QTDIR }, 0, 0550,
"wdctl", { Qwdctl, 0 }, 0, 0660,
};
void
addwatchdog(Watchdog *watchdog)
{
if(wd){
print("addwatchdog: watchdog already installed\n");
return;
}
wd = watchdog;
if(wd)
wd->disable();
}
static Chan*
wdattach(char *spec)
{
return devattach('w', spec);
}
static Walkqid*
wdwalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, wddir, nelem(wddir), devgen);
}
static int
wdstat(Chan *c, uchar *dp, int n)
{
return devstat(c, dp, n, wddir, nelem(wddir), devgen);
}
static Chan*
wdopen(Chan* c, int omode)
{
return devopen(c, omode, wddir, nelem(wddir), devgen);
}
static void
wdclose(Chan*)
{
}
static long
wdread(Chan* c, void* a, long n, vlong off)
{
ulong offset = off;
char *p;
switch((ulong)c->qid.path){
case Qdir:
return devdirread(c, a, n, wddir, nelem(wddir), devgen);
case Qwdctl:
if(wd == nil || wd->stat == nil)
return 0;
p = malloc(READSTR);
if(waserror()){
free(p);
nexterror();
}
wd->stat(p, p + READSTR);
n = readstr(offset, a, n, p);
free(p);
poperror();
return n;
default:
error(Egreg);
break;
}
return 0;
}
static long
wdwrite(Chan* c, void* a, long n, vlong off)
{
ulong offset = off;
char *p;
switch((ulong)c->qid.path){
case Qdir:
error(Eperm);
case Qwdctl:
if(wd == nil)
return n;
if(offset || n >= READSTR)
error(Ebadarg);
if((p = strchr(a, '\n')) != nil)
*p = 0;
if(strncmp(a, "enable", n) == 0)
wd->enable();
else if(strncmp(a, "disable", n) == 0)
wd->disable();
else if(strncmp(a, "restart", n) == 0)
wd->restart();
else
error(Ebadarg);
return n;
default:
error(Egreg);
break;
}
return 0;
}
Dev wddevtab = {
'w',
"watchdog",
devreset,
devinit,
devshutdown,
wdattach,
wdwalk,
wdstat,
wdopen,
devcreate,
wdclose,
wdread,
devbread,
wdwrite,
devbwrite,
devremove,
devwstat,
devpower,
};
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