usr/src/sys/h/callo.h

/*      callo.h 4.1     11/9/80 */

/*
 * 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 */
};
struct  callo   callout[NCALL];