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setjmp.h
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/* Copyright (C) 1991-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ /* * ISO C99 Standard: 7.13 Nonlocal jumps <setjmp.h> */ #ifndef _SETJMP_H #define _SETJMP_H 1 #include <features.h> __BEGIN_DECLS #include <bits/setjmp.h> /* Get `__jmp_buf'. */ #include <bits/types/__sigset_t.h> /* Calling environment, plus possibly a saved signal mask. */ struct __jmp_buf_tag { /* NOTE: The machine-dependent definitions of `__sigsetjmp' assume that a `jmp_buf' begins with a `__jmp_buf' and that `__mask_was_saved' follows it. Do not move these members or add others before it. */ __jmp_buf __jmpbuf; /* Calling environment. */ int __mask_was_saved; /* Saved the signal mask? */ __sigset_t __saved_mask; /* Saved signal mask. */ }; typedef struct __jmp_buf_tag jmp_buf[1]; /* Store the calling environment in ENV, also saving the signal mask. Return 0. */ extern int setjmp (jmp_buf __env) __THROWNL; /* Store the calling environment in ENV, also saving the signal mask if SAVEMASK is nonzero. Return 0. This is the internal name for `sigsetjmp'. */ extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROWNL; /* Store the calling environment in ENV, not saving the signal mask. Return 0. */ extern int _setjmp (struct __jmp_buf_tag __env[1]) __THROWNL; /* Do not save the signal mask. This is equivalent to the `_setjmp' BSD function. */ #define setjmp(env) _setjmp (env) /* Jump to the environment saved in ENV, making the `setjmp' call there return VAL, or 1 if VAL is 0. */ extern void longjmp (struct __jmp_buf_tag __env[1], int __val) __THROWNL __attribute__ ((__noreturn__)); #if defined __USE_MISC || defined __USE_XOPEN /* Same. Usually `_longjmp' is used with `_setjmp', which does not save the signal mask. But it is how ENV was saved that determines whether `longjmp' restores the mask; `_longjmp' is just an alias. */ extern void _longjmp (struct __jmp_buf_tag __env[1], int __val) __THROWNL __attribute__ ((__noreturn__)); #endif #ifdef __USE_POSIX /* Use the same type for `jmp_buf' and `sigjmp_buf'. The `__mask_was_saved' flag determines whether or not `longjmp' will restore the signal mask. */ typedef struct __jmp_buf_tag sigjmp_buf[1]; /* Store the calling environment in ENV, also saving the signal mask if SAVEMASK is nonzero. Return 0. */ # define sigsetjmp(env, savemask) __sigsetjmp (env, savemask) /* Jump to the environment saved in ENV, making the sigsetjmp call there return VAL, or 1 if VAL is 0. Restore the signal mask if that sigsetjmp call saved it. This is just an alias `longjmp'. */ extern void siglongjmp (sigjmp_buf __env, int __val) __THROWNL __attribute__ ((__noreturn__)); #endif /* Use POSIX. */ /* Define helper functions to catch unsafe code. */ #if __USE_FORTIFY_LEVEL > 0 # include <bits/setjmp2.h> #endif __END_DECLS #endif /* setjmp.h */
