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sourceware.org Git - glibc.git/blob - bits/sigset.h
1 /* __sig_atomic_t, __sigset_t, and related definitions. Generic/BSD version.
2 Copyright (C) 1991, 1992, 1994, 1996, 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #ifndef _SIGSET_H_types
21 #define _SIGSET_H_types 1
23 typedef int __sig_atomic_t
;
25 /* A `sigset_t' has a bit for each signal. */
26 typedef unsigned long int __sigset_t
;
31 /* We only want to define these functions if <signal.h> was actually
32 included; otherwise we were included just to define the types. Since we
33 are namespace-clean, it wouldn't hurt to define extra macros. But
34 trouble can be caused by functions being defined (e.g., any global
35 register vars declared later will cause compilation errors). */
37 #if !defined _SIGSET_H_fns && defined _SIGNAL_H
38 #define _SIGSET_H_fns 1
40 #ifndef _EXTERN_INLINE
41 # define _EXTERN_INLINE extern __inline
44 /* Return a mask that includes SIG only. The cast to `sigset_t' avoids
45 overflow if `sigset_t' is wider than `int'. */
46 #define __sigmask(sig) (((__sigset_t) 1) << ((sig) - 1))
48 #define __sigemptyset(set) ((*(set) = (__sigset_t) 0), 0)
49 #define __sigfillset(set) ((*(set) = ~(__sigset_t) 0), 0)
52 # define __sigisemptyset(set) (*(set) == (__sigset_t) 0)
53 # define __sigandset(dest, left, right) \
54 ((*(dest) = (*(left) & *(right))), 0)
55 # define __sigorset(dest, left, right) \
56 ((*(dest) = (*(left) | *(right))), 0)
59 /* These functions needn't check for a bogus signal number -- error
60 checking is done in the non __ versions. */
62 extern int __sigismember (__const __sigset_t
*, int);
63 extern int __sigaddset (__sigset_t
*, int);
64 extern int __sigdelset (__sigset_t
*, int);
66 #ifdef __USE_EXTERN_INLINES
67 # define __SIGSETFN(NAME, BODY, CONST) \
69 NAME (CONST __sigset_t *__set, int __sig) \
71 __sigset_t __mask = __sigmask (__sig); \
75 __SIGSETFN (__sigismember
, (*__set
& __mask
) ? 1 : 0, __const
)
76 __SIGSETFN (__sigaddset
, ((*__set
|= __mask
), 0), )
77 __SIGSETFN (__sigdelset
, ((*__set
&= ~__mask
), 0), )
83 #endif /* ! _SIGSET_H_fns. */
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