1 /* Copyright (C) 1991-1999,2001,2002,2007,2009 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, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
18
19 /*
20 * ISO C99 Standard: 7.13 Nonlocal jumps <setjmp.h>
21 */
22
23 #ifndef _SETJMP_H
24 #define _SETJMP_H 1
25
26 #include <features.h>
27
28 __BEGIN_DECLS
29
30 #include <bits/setjmp.h> /* Get `__jmp_buf'. */
31 #include <bits/sigset.h> /* Get `__sigset_t'. */
32
33
34 /* Calling environment, plus possibly a saved signal mask. */
35 struct __jmp_buf_tag
36 {
37 /* NOTE: The machine-dependent definitions of `__sigsetjmp'
38 assume that a `jmp_buf' begins with a `__jmp_buf' and that
39 `__mask_was_saved' follows it. Do not move these members
40 or add others before it. */
41 __jmp_buf __jmpbuf; /* Calling environment. */
42 int __mask_was_saved; /* Saved the signal mask? */
43 __sigset_t __saved_mask; /* Saved signal mask. */
44 };
45
46
47 __BEGIN_NAMESPACE_STD
48
49 typedef struct __jmp_buf_tag jmp_buf[1];
50
51 /* Store the calling environment in ENV, also saving the signal mask.
52 Return 0. */
53 extern int setjmp (jmp_buf __env) __THROW;
54
55 __END_NAMESPACE_STD
56
57 /* Store the calling environment in ENV, also saving the
58 signal mask if SAVEMASK is nonzero. Return 0.
59 This is the internal name for `sigsetjmp'. */
60 extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROW;
61
62 #ifndef __FAVOR_BSD
63 /* Store the calling environment in ENV, not saving the signal mask.
64 Return 0. */
65 extern int _setjmp (struct __jmp_buf_tag __env[1]) __THROW;
66
67 /* Do not save the signal mask. This is equivalent to the `_setjmp'
68 BSD function. */
69 # define setjmp(env) _setjmp (env)
70 #else
71 /* We are in 4.3 BSD-compatibility mode in which `setjmp'
72 saves the signal mask like `sigsetjmp (ENV, 1)'. We have to
73 define a macro since ISO C says `setjmp' is one. */
74 # define setjmp(env) setjmp (env)
75 #endif /* Favor BSD. */
76
77
78 __BEGIN_NAMESPACE_STD
79
80 /* Jump to the environment saved in ENV, making the
81 `setjmp' call there return VAL, or 1 if VAL is 0. */
82 extern void longjmp (struct __jmp_buf_tag __env[1], int __val)
83 __THROW __attribute__ ((__noreturn__));
84
85 __END_NAMESPACE_STD
86
87 #if defined __USE_BSD || defined __USE_XOPEN
88 /* Same. Usually `_longjmp' is used with `_setjmp', which does not save
89 the signal mask. But it is how ENV was saved that determines whether
90 `longjmp' restores the mask; `_longjmp' is just an alias. */
91 extern void _longjmp (struct __jmp_buf_tag __env[1], int __val)
92 __THROW __attribute__ ((__noreturn__));
93 #endif
94
95
96 #ifdef __USE_POSIX
97 /* Use the same type for `jmp_buf' and `sigjmp_buf'.
98 The `__mask_was_saved' flag determines whether
99 or not `longjmp' will restore the signal mask. */
100 typedef struct __jmp_buf_tag sigjmp_buf[1];
101
102 /* Store the calling environment in ENV, also saving the
103 signal mask if SAVEMASK is nonzero. Return 0. */
104 # define sigsetjmp(env, savemask) __sigsetjmp (env, savemask)
105
106 /* Jump to the environment saved in ENV, making the
107 sigsetjmp call there return VAL, or 1 if VAL is 0.
108 Restore the signal mask if that sigsetjmp call saved it.
109 This is just an alias `longjmp'. */
110 extern void siglongjmp (sigjmp_buf __env, int __val)
111 __THROW __attribute__ ((__noreturn__));
112 #endif /* Use POSIX. */
113
114
115 /* Define helper functions to catch unsafe code. */
116 #if __USE_FORTIFY_LEVEL > 0
117 # include <bits/setjmp2.h>
118 #endif
119
120 __END_DECLS
121
122 #endif /* setjmp.h */
123