1603 struct	callout {  struct
1607     struct		callout *c_next;  argument
1610 static struct callout *callout = NULL;	/* Callout list */  variable
1625     struct callout *newp, *p, **pp;
1632     if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1643     for (pp = &callout; (p = *pp) != NULL; pp = &p->c_next)
1661     struct callout **copp, *freep;
1668     for (copp = &callout; (freep = *copp) != NULL; copp = &freep->c_next)
1683     struct callout *p;  in calltimeout()
1685     while (callout != NULL) {  in calltimeout()
1686 	p = callout;  in calltimeout()
1695 	callout = p->c_next;  in calltimeout()
1710     if (callout == NULL)
1714     tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1715     tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;