1/* Copyright (C) 1991-2022 Free Software Foundation, Inc. 
2 This file is part of the GNU C Library. 
3 
4 The GNU C Library is free software; you can redistribute it and/or 
5 modify it under the terms of the GNU Lesser General Public 
6 License as published by the Free Software Foundation; either 
7 version 2.1 of the License, or (at your option) any later version. 
8 
9 The GNU C Library is distributed in the hope that it will be useful, 
10 but WITHOUT ANY WARRANTY; without even the implied warranty of 
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
12 Lesser General Public License for more details. 
13 
14 You should have received a copy of the GNU Lesser General Public 
15 License along with the GNU C Library; if not, see 
16 <https://www.gnu.org/licenses/>. */ 
17 
18/* 
19 * ISO C99 Standard: 7.13 Nonlocal jumps <setjmp.h> 
20 */ 
21 
22#ifndef _SETJMP_H 
23#define _SETJMP_H 1 
24 
25#include <features.h> 
26 
27__BEGIN_DECLS 
28 
29#include <bits/setjmp.h> /* Get `__jmp_buf'. */ 
30#include <bits/types/struct___jmp_buf_tag.h> 
31 
32typedef struct __jmp_buf_tag jmp_buf[1]; 
33 
34/* Store the calling environment in ENV, also saving the signal mask. 
35 Return 0. */ 
36extern int setjmp (jmp_buf __env) __THROWNL; 
37 
38/* Store the calling environment in ENV, also saving the 
39 signal mask if SAVEMASK is nonzero. Return 0. 
40 This is the internal name for `sigsetjmp'. */ 
41extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROWNL; 
42 
43/* Store the calling environment in ENV, not saving the signal mask. 
44 Return 0. */ 
45extern int _setjmp (struct __jmp_buf_tag __env[1]) __THROWNL; 
46 
47/* Do not save the signal mask. This is equivalent to the `_setjmp' 
48 BSD function. */ 
49#define setjmp(env) _setjmp (env) 
50 
51 
52/* Jump to the environment saved in ENV, making the 
53 `setjmp' call there return VAL, or 1 if VAL is 0. */ 
54extern void longjmp (struct __jmp_buf_tag __env[1], int __val) 
55 __THROWNL __attribute__ ((__noreturn__)); 
56 
57#if defined __USE_MISC || defined __USE_XOPEN 
58/* Same. Usually `_longjmp' is used with `_setjmp', which does not save 
59 the signal mask. But it is how ENV was saved that determines whether 
60 `longjmp' restores the mask; `_longjmp' is just an alias. */ 
61extern void _longjmp (struct __jmp_buf_tag __env[1], int __val) 
62 __THROWNL __attribute__ ((__noreturn__)); 
63#endif 
64 
65 
66#ifdef __USE_POSIX 
67/* Use the same type for `jmp_buf' and `sigjmp_buf'. 
68 The `__mask_was_saved' flag determines whether 
69 or not `longjmp' will restore the signal mask. */ 
70typedef struct __jmp_buf_tag sigjmp_buf[1]; 
71 
72/* Store the calling environment in ENV, also saving the 
73 signal mask if SAVEMASK is nonzero. Return 0. */ 
74# define sigsetjmp(env, savemask) __sigsetjmp (env, savemask) 
75 
76/* Jump to the environment saved in ENV, making the 
77 sigsetjmp call there return VAL, or 1 if VAL is 0. 
78 Restore the signal mask if that sigsetjmp call saved it. 
79 This is just an alias `longjmp'. */ 
80extern void siglongjmp (sigjmp_buf __env, int __val) 
81 __THROWNL __attribute__ ((__noreturn__)); 
82#endif /* Use POSIX. */ 
83 
84 
85/* Define helper functions to catch unsafe code. */ 
86#if __USE_FORTIFY_LEVEL > 0 
87# include <bits/setjmp2.h> 
88#endif 
89 
90__END_DECLS 
91 
92#endif /* setjmp.h */ 
93