4.3BSD-Reno/src/lib/libF77/sigframe.h

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/*
 * Definition of signal handler frame.
 */

struct sigframe {
	int	sf_signum;
	int	sf_code;
	struct	sigcontext *sf_scp;
	int	(*sf_handler)();
	int	r1;
	int 	r0;
	struct	sigcontext *sf_scpcopy;
};