40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/*
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* setjmp.h - save/restore calling environment
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*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Header$ */
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#if !defined(_SETJMP_H)
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#define _SETJMP_H
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/* In a jmp_buf, there is room for: 1 mask (long), 1 flag (int) and 3
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* pointers (stack-pointer, local base and program-counter). This may be
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* too big, but that doesn't matter. It could also be too small, when
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* sigset_t is larger than a long. The fields is in the structure have no
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* meaning, they just get the size right.
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* The identifier __setjmp has a special meaning to the compiler.
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*/
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typedef struct {
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long __mask;
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int __flag;
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void (*__pc)();
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void *__sp;
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void *__lb;
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} jmp_buf[1];
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int __setjmp(jmp_buf _env, int _savemask);
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#define setjmp(env) __setjmp(env, 0)
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void longjmp(jmp_buf _env, int _val);
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#if defined(_POSIX_SOURCE)
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typedef jmp_buf sigjmp_buf;
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#define sigsetjmp(env, savemask) __setjmp(env, savemask)
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int siglongjmp(sigjmp_buf _env, int _val);
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#endif
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#endif /* _SETJMP_H */
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