1 /* Copyright (C) 1991-1999,2001,2002,2007,2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
19 * ISO C99 Standard: 7.13 Nonlocal jumps <setjmp.h>
29 #include <bits/setjmp.h> /* Get `__jmp_buf'. */
30 #include <bits/sigset.h> /* Get `__sigset_t'. */
33 /* Calling environment, plus possibly a saved signal mask. */
36 /* NOTE: The machine-dependent definitions of `__sigsetjmp'
37 assume that a `jmp_buf' begins with a `__jmp_buf' and that
38 `__mask_was_saved' follows it. Do not move these members
39 or add others before it. */
40 __jmp_buf __jmpbuf
; /* Calling environment. */
41 int __mask_was_saved
; /* Saved the signal mask? */
42 __sigset_t __saved_mask
; /* Saved signal mask. */
48 typedef struct __jmp_buf_tag
jmp_buf[1];
50 /* Store the calling environment in ENV, also saving the signal mask.
52 extern int setjmp (jmp_buf __env
) __THROWNL
;
56 /* Store the calling environment in ENV, also saving the
57 signal mask if SAVEMASK is nonzero. Return 0.
58 This is the internal name for `sigsetjmp'. */
59 extern int __sigsetjmp (struct __jmp_buf_tag __env
[1], int __savemask
)
63 /* Store the calling environment in ENV, not saving the signal mask.
65 extern int _setjmp (struct __jmp_buf_tag __env
[1]) __THROWNL
;
67 /* Do not save the signal mask. This is equivalent to the `_setjmp'
69 # define setjmp(env) _setjmp (env)
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. */
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 __THROWNL
__attribute__ ((__noreturn__
));
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 __THROWNL
__attribute__ ((__noreturn__
));
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];
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)
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 __THROWNL
__attribute__ ((__noreturn__
));
112 #endif /* Use POSIX. */
117 extern void __longjmp(__jmp_buf __env
, int __val
) __THROWNL attribute_noreturn
;
118 libc_hidden_proto(__longjmp
)
119 extern __typeof(longjmp
) __libc_longjmp __THROWNL attribute_noreturn
;
120 extern __typeof(siglongjmp
) __libc_siglongjmp __THROWNL attribute_noreturn
;
121 extern void _longjmp_unwind(jmp_buf __env
, int __val
);
122 libc_hidden_proto(_longjmp_unwind
)
123 extern int __sigjmp_save(sigjmp_buf __env
, int __savemask
) attribute_hidden
;
124 /* We use the normal longjmp for unwinding */
125 # define __libc_unwind_longjmp(buf, val) __libc_longjmp(buf, val)
128 #endif /* setjmp.h */