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1 | /* __sig_atomic_t, __sigset_t, and related definitions. Generic/BSD version. |
2 | Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
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 | |
17 | not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave, | |
18 | Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #ifndef _SIGSET_H_types | |
21 | #define _SIGSET_H_types 1 | |
22 | ||
23 | typedef int __sig_atomic_t; | |
24 | ||
25 | /* A `sigset_t' has a bit for each signal. */ | |
26 | typedef unsigned long int __sigset_t; | |
27 | ||
28 | #endif | |
29 | ||
30 | ||
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). */ | |
36 | ||
37 | #if !defined (_SIGSET_H_fns) && defined (_SIGNAL_H) | |
38 | #define _SIGSET_H_fns 1 | |
39 | ||
40 | /* Return a mask that includes SIG only. The cast to `sigset_t' avoids | |
41 | overflow if `sigset_t' is wider than `int'. */ | |
42 | #define __sigmask(sig) (((__sigset_t) 1) << ((sig) - 1)) | |
43 | ||
44 | #define __sigemptyset(set) ((*(set) = (__sigset_t) 0), 0) | |
45 | #define __sigfillset(set) ((*(set) = ~(__sigset_t) 0), 0) | |
46 | ||
47 | /* These functions must check for a bogus signal number. We detect it by a | |
48 | zero sigmask, since a number too low or too high will have shifted the 1 | |
49 | off the high end of the mask. If we find an error, we punt to a random | |
50 | call we know fails with EINVAL (kludge city!), so as to avoid referring | |
51 | to `errno' in this file (sigh). */ | |
52 | ||
53 | #ifndef _EXTERN_INLINE | |
54 | #define _EXTERN_INLINE extern __inline | |
55 | #endif | |
56 | #define __SIGSETFN(NAME, BODY, CONST) \ | |
57 | _EXTERN_INLINE int \ | |
58 | __##NAME (CONST __sigset_t *__set, int __sig) \ | |
59 | { \ | |
60 | if (__sig < 1 || __sig > sizeof (__sigset_t) * 8) \ | |
61 | { \ | |
62 | extern int raise (int); \ | |
63 | return raise (-1); \ | |
64 | } \ | |
65 | else \ | |
66 | { \ | |
67 | __sigset_t __mask = __sigmask (__sig); \ | |
68 | return BODY; \ | |
69 | } \ | |
70 | } | |
71 | ||
72 | __SIGSETFN (sigismember, (*__set & __mask) ? 1 : 0, __const) | |
73 | __SIGSETFN (sigaddset, ((*__set |= __mask), 0), ) | |
74 | __SIGSETFN (sigdelset, ((*__set &= ~__mask), 0), ) | |
75 | ||
76 | #undef __SIGSETFN | |
77 | ||
78 | ||
79 | #endif /* ! _SIGSET_H_fns. */ |