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glibc/bits/sigset.h
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/* __sig_atomic_t, __sigset_t, and related definitions. Generic/BSD version. | |
Copyright (C) 1991-2016 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/>. */ | |
#ifndef _SIGSET_H_types | |
#define _SIGSET_H_types 1 | |
typedef int __sig_atomic_t; | |
/* A `sigset_t' has a bit for each signal. */ | |
typedef unsigned long int __sigset_t; | |
#endif | |
/* We only want to define these functions if <signal.h> was actually | |
included; otherwise we were included just to define the types. Since we | |
are namespace-clean, it wouldn't hurt to define extra macros. But | |
trouble can be caused by functions being defined (e.g., any global | |
register vars declared later will cause compilation errors). */ | |
#if !defined _SIGSET_H_fns && defined _SIGNAL_H | |
#define _SIGSET_H_fns 1 | |
#ifndef _EXTERN_INLINE | |
# define _EXTERN_INLINE __extern_inline | |
#endif | |
/* Return a mask that includes SIG only. The cast to `sigset_t' avoids | |
overflow if `sigset_t' is wider than `int'. */ | |
#define __sigmask(sig) (((__sigset_t) 1) << ((sig) - 1)) | |
#define __sigemptyset(set) \ | |
(__extension__ ({ *(set) = (__sigset_t) 0; 0; }) | |
#define __sigfillset(set) \ | |
(__extension__ ({ *(set) = ~(__sigset_t) 0; 0; })) | |
#ifdef _GNU_SOURCE | |
# define __sigisemptyset(set) (*(set) == (__sigset_t) 0) | |
# define __sigandset(dest, left, right) \ | |
(__extension__ ({ *(dest) = *(left) & *(right); 0; })) | |
# define __sigorset(dest, left, right) \ | |
(__extension__ ({ *(dest) = *(left) | *(right); 0; })) | |
#endif | |
/* These functions needn't check for a bogus signal number -- error | |
checking is done in the non __ versions. */ | |
extern int __sigismember (const __sigset_t *, int); | |
extern int __sigaddset (__sigset_t *, int); | |
extern int __sigdelset (__sigset_t *, int); | |
#ifdef __USE_EXTERN_INLINES | |
# define __SIGSETFN(NAME, BODY, CONST) \ | |
_EXTERN_INLINE int \ | |
NAME (CONST __sigset_t *__set, int __sig) \ | |
{ \ | |
__sigset_t __mask = __sigmask (__sig); \ | |
return BODY; \ | |
} | |
__SIGSETFN (__sigismember, (*__set & __mask) ? 1 : 0, const) | |
__SIGSETFN (__sigaddset, ((*__set |= __mask), 0), ) | |
__SIGSETFN (__sigdelset, ((*__set &= ~__mask), 0), ) | |
# undef __SIGSETFN | |
#endif | |
#endif /* ! _SIGSET_H_fns. */ |