#ifndef _SIGNALS_H_169f36e0_
#define _SIGNALS_H_169f36e0_

/*
 * APIs exported by signals.c.  These are related to SIGINT processing.
 *
 * A SIGINT - when not blocked - jumps to the top JMP on an internal
 *  stack, the SIGINT jump-to stack.  Code that wishes to catch SIGINT
 *  should push a JMP on this stack, then pop it when it's done.
 *  SIGINT processing may also be blocked; while blocked, jumping is
 *  disabled, but signals are remembered and provoke a jump when
 *  processing is unblocked.
 */

#include "structs.h"

/*
 * Initialize the signal-processing code.  Called during startup.
 */
extern void initsignals(void);

/*
 * Return a serial number, essentially a count of the SIGINTs handled.
 *  This can be called before and after a section of code to find out
 *  whether a SIGINT was handled during that section.
 */
extern int interrupted(void);

/*
 * Push a JMP on the SIGINT jump-to stack.
 */
extern void push_sigint_throw(JMP *);

/*
 * Push a JMP on the SIGINT jump-to stack.
 */
extern void pop_sigint_throw(void);

/*
 * Block SIGINT processing.
 */
extern void block_int(void);

/*
 * Unblock SIGINT processing.
 */
extern void unblock_int(void);

#endif