1/* Copyright (C) 1991-2020 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/__sigset_t.h> 
31 
32/* Calling environment, plus possibly a saved signal mask. */ 
33struct __jmp_buf_tag 
34 { 
35 /* NOTE: The machine-dependent definitions of `__sigsetjmp' 
36 assume that a `jmp_buf' begins with a `__jmp_buf' and that 
37 `__mask_was_saved' follows it. Do not move these members 
38 or add others before it. */ 
39 __jmp_buf __jmpbuf; /* Calling environment. */ 
40 int __mask_was_saved; /* Saved the signal mask? */ 
41 __sigset_t __saved_mask; /* Saved signal mask. */ 
42 }; 
43 
44 
45typedef struct __jmp_buf_tag jmp_buf[1]; 
46 
47/* Store the calling environment in ENV, also saving the signal mask. 
48 Return 0. */ 
49extern int setjmp (jmp_buf __env) __THROWNL; 
50 
51/* Store the calling environment in ENV, also saving the 
52 signal mask if SAVEMASK is nonzero. Return 0. 
53 This is the internal name for `sigsetjmp'. */ 
54extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROWNL; 
55 
56/* Store the calling environment in ENV, not saving the signal mask. 
57 Return 0. */ 
58extern int _setjmp (struct __jmp_buf_tag __env[1]) __THROWNL; 
59 
60/* Do not save the signal mask. This is equivalent to the `_setjmp' 
61 BSD function. */ 
62#define setjmp(env) _setjmp (env) 
63 
64 
65/* Jump to the environment saved in ENV, making the 
66 `setjmp' call there return VAL, or 1 if VAL is 0. */ 
67extern void longjmp (struct __jmp_buf_tag __env[1], int __val) 
68 __THROWNL __attribute__ ((__noreturn__)); 
69 
70#if defined __USE_MISC || defined __USE_XOPEN 
71/* Same. Usually `_longjmp' is used with `_setjmp', which does not save 
72 the signal mask. But it is how ENV was saved that determines whether 
73 `longjmp' restores the mask; `_longjmp' is just an alias. */ 
74extern void _longjmp (struct __jmp_buf_tag __env[1], int __val) 
75 __THROWNL __attribute__ ((__noreturn__)); 
76#endif 
77 
78 
79#ifdef __USE_POSIX 
80/* Use the same type for `jmp_buf' and `sigjmp_buf'. 
81 The `__mask_was_saved' flag determines whether 
82 or not `longjmp' will restore the signal mask. */ 
83typedef struct __jmp_buf_tag sigjmp_buf[1]; 
84 
85/* Store the calling environment in ENV, also saving the 
86 signal mask if SAVEMASK is nonzero. Return 0. */ 
87# define sigsetjmp(env, savemask) __sigsetjmp (env, savemask) 
88 
89/* Jump to the environment saved in ENV, making the 
90 sigsetjmp call there return VAL, or 1 if VAL is 0. 
91 Restore the signal mask if that sigsetjmp call saved it. 
92 This is just an alias `longjmp'. */ 
93extern void siglongjmp (sigjmp_buf __env, int __val) 
94 __THROWNL __attribute__ ((__noreturn__)); 
95#endif /* Use POSIX. */ 
96 
97 
98/* Define helper functions to catch unsafe code. */ 
99#if __USE_FORTIFY_LEVEL > 0 
100# include <bits/setjmp2.h> 
101#endif 
102 
103__END_DECLS 
104 
105#endif /* setjmp.h */ 
106