1/* Copyright (C) 1991-2018 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 <http://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