1 /* Copyright (C) 1991-1999,2001,2002,2007,2009,2011 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/sigset.h> /* Get `__sigset_t'. */ 31 32 33 /* Calling environment, plus possibly a saved signal mask. */ 34 struct __jmp_buf_tag 35 { 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. */ 43 }; 44 45 46 __BEGIN_NAMESPACE_STD 47 48 typedef struct __jmp_buf_tag jmp_buf[1]; 49 50 /* Store the calling environment in ENV, also saving the signal mask. 51 Return 0. */ 52 extern int setjmp (jmp_buf __env) __THROWNL; 53 54 __END_NAMESPACE_STD 55 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) __THROWNL; 60 61 #ifndef __FAVOR_BSD 62 /* Store the calling environment in ENV, not saving the signal mask. 63 Return 0. */ 64 extern int _setjmp (struct __jmp_buf_tag __env[1]) __THROWNL; 65 66 /* Do not save the signal mask. This is equivalent to the `_setjmp' 67 BSD function. */ 68 # define setjmp(env) _setjmp (env) 69 #else 70 /* We are in 4.3 BSD-compatibility mode in which `setjmp' 71 saves the signal mask like `sigsetjmp (ENV, 1)'. We have to 72 define a macro since ISO C says `setjmp' is one. */ 73 # define setjmp(env) setjmp (env) 74 #endif /* Favor BSD. */ 75 76 77 __BEGIN_NAMESPACE_STD 78 79 /* Jump to the environment saved in ENV, making the 80 `setjmp' call there return VAL, or 1 if VAL is 0. */ 81 extern void longjmp (struct __jmp_buf_tag __env[1], int __val) 82 __THROWNL __attribute__ ((__noreturn__)); 83 84 __END_NAMESPACE_STD 85 86 #if defined __USE_BSD || defined __USE_XOPEN 87 /* Same. Usually `_longjmp' is used with `_setjmp', which does not save 88 the signal mask. But it is how ENV was saved that determines whether 89 `longjmp' restores the mask; `_longjmp' is just an alias. */ 90 extern void _longjmp (struct __jmp_buf_tag __env[1], int __val) 91 __THROWNL __attribute__ ((__noreturn__)); 92 #endif 93 94 95 #ifdef __USE_POSIX 96 /* Use the same type for `jmp_buf' and `sigjmp_buf'. 97 The `__mask_was_saved' flag determines whether 98 or not `longjmp' will restore the signal mask. */ 99 typedef struct __jmp_buf_tag sigjmp_buf[1]; 100 101 /* Store the calling environment in ENV, also saving the 102 signal mask if SAVEMASK is nonzero. Return 0. */ 103 # define sigsetjmp(env, savemask) __sigsetjmp (env, savemask) 104 105 /* Jump to the environment saved in ENV, making the 106 sigsetjmp call there return VAL, or 1 if VAL is 0. 107 Restore the signal mask if that sigsetjmp call saved it. 108 This is just an alias `longjmp'. */ 109 extern void siglongjmp (sigjmp_buf __env, int __val) 110 __THROWNL __attribute__ ((__noreturn__)); 111 #endif /* Use POSIX. */ 112 113 114 /* Define helper functions to catch unsafe code. */ 115 #if __USE_FORTIFY_LEVEL > 0 116 # include <bits/setjmp2.h> 117 #endif 118 119 __END_DECLS 120 121 #endif /* setjmp.h */ 122