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Diffstat (limited to 'setjmp/setjmp.h')
| -rw-r--r-- | setjmp/setjmp.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/setjmp/setjmp.h b/setjmp/setjmp.h new file mode 100644 index 0000000000..479cf973ec --- /dev/null +++ b/setjmp/setjmp.h @@ -0,0 +1,112 @@ +/* Copyright (C) 1991, 1992, 1993, 1994, 1995 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 Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* + * ANSI Standard: 4.6 NON-LOCAL JUMPS <setjmp.h> + */ + +#ifndef _SETJMP_H + +#define _SETJMP_H 1 +#include <features.h> + +__BEGIN_DECLS + +/* Get the machine-dependent definition of `__jmp_buf'. */ +#include <jmp_buf.h> +#include <sigset.h> /* Get `__sigset_t'. */ + +/* Calling environment, plus possibly a saved signal mask. */ +typedef struct + { + /* NOTE: The machine-dependent definitions of `__sigsetjmp' + assume that a `jmp_buf' begins with a `__jmp_buf'. + Do not move this member 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. */ + } jmp_buf[1]; + + +/* 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 __P ((jmp_buf __env, int __savemask)); + +#ifndef __FAVOR_BSD +/* Set ENV to the current position and return 0, not saving the signal mask. + This is just like `sigsetjmp (ENV, 0)'. + The ANSI C standard says `setjmp' is a macro. */ +#define setjmp(env) __sigsetjmp ((env), 0) +#else +/* We are in 4.3 BSD-compatibility mode in which `setjmp' + saves the signal mask like `sigsetjmp (ENV, 1)'. */ +#define setjmp(env) __sigsetjmp ((env), 1) +#endif /* Favor BSD. */ + +#ifdef __USE_BSD +/* Set ENV to the current position and return 0, not saving the signal mask. + This is the 4.3 BSD name for ANSI `setjmp'. */ +#define _setjmp(env) __sigsetjmp ((env), 0) +#endif + + +/* Jump to the environment saved in ENV, making the + `setjmp' call there return VAL, or 1 if VAL is 0. */ +extern void longjmp __P ((jmp_buf __env, int __val)) + __attribute__ ((__noreturn__)); +#ifdef __USE_BSD +/* 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 __P ((jmp_buf __env, int __val)) + __attribute__ ((__noreturn__)); +#endif /* Use BSD. */ + +/* Internal machine-dependent function to restore context sans signal mask. */ +extern void __longjmp __P ((__jmp_buf __env, int __val)) + __attribute__ ((__noreturn__)); + +/* Internal function to possibly save the current mask of blocked signals + in ENV, and always set the flag saying whether or not it was saved. + This is used by the machine-dependent definition of `__sigsetjmp'. + Always returns zero, for convenience. */ +extern int __sigjmp_save __P ((jmp_buf __env, int __savemask)); + + +#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 jmp_buf sigjmp_buf; + +/* 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 __P ((sigjmp_buf __env, int __val)) + __attribute__ ((__noreturn__)); +#endif /* Use POSIX. */ + +__END_DECLS + +#endif /* setjmp.h */ |