1307 struct	callout {  struct
1311     struct		callout *c_next;  argument
1314 static struct callout *callout = NULL;	/* Callout list */  variable
1326     struct callout *newp, *p, **pp;
1331     if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1346     for (pp = &callout; (p = *pp); pp = &p->c_next)
1364     struct callout **copp, *freep;
1369     for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1384     struct callout *p;  in calltimeout()
1386     while (callout != NULL) {  in calltimeout()
1387 	p = callout;  in calltimeout()
1396 	callout = p->c_next;  in calltimeout()
1411     if (callout == NULL)
1415     tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1416     tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;