4.4BSD/usr/src/contrib/rc-1.4/jbwrap.h

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/* certain braindamaged environments don't define jmp_buf as an array, so... */

struct Jbwrap {
	jmp_buf j;
};

extern Jbwrap slowbuf; /* for getting out of interrupts while performing slow i/o on BSD */

extern int setjmp(jmp_buf);
extern void longjmp(jmp_buf, int);