pdp11v/usr/include/sys/callo.h

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/* @(#)callo.h	1.1 */
/*
 * The callout structure is for a routine arranging
 * to be called by the clock interrupt
 * (clock.c) with a specified argument,
 * in a specified amount of time.
 * Used, for example, to time tab delays on typewriters.
 */

struct	callo
{
	int	c_time;		/* incremental time */
	caddr_t	c_arg;		/* argument to routine */
	int	(*c_func)();	/* routine */
};
extern struct callo callout[];