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, 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) __THROWNL; 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) __THROWNL; 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]) __THROWNL; 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 __THROWNL __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 __THROWNL __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 __THROWNL __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
