1 /* __sig_atomic_t, __sigset_t, and related definitions. Linux version.
2 Copyright (C) 1991, 1992, 1994, 1996, 1997, 2007
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
20
21 #ifndef _SIGSET_H_types
22 # define _SIGSET_H_types 1
23
24 typedef int __sig_atomic_t;
25
26 /* A `sigset_t' has a bit for each signal. */
27
28 # define _SIGSET_NWORDS (1024 / (8 * sizeof (unsigned long int)))
29 typedef struct
30 {
31 unsigned long int __val[_SIGSET_NWORDS];
32 } __sigset_t;
33
34 #endif
35
36
37 /* We only want to define these functions if <signal.h> was actually
38 included; otherwise we were included just to define the types. Since we
39 are namespace-clean, it wouldn't hurt to define extra macros. But
40 trouble can be caused by functions being defined (e.g., any global
41 register vars declared later will cause compilation errors). */
42
43 #if !defined _SIGSET_H_fns && defined _SIGNAL_H
44 # define _SIGSET_H_fns 1
45
46 # ifndef _EXTERN_INLINE
47 # define _EXTERN_INLINE __extern_inline
48 # endif
49
50 /* Return a mask that includes the bit for SIG only. */
51 # define __sigmask(sig) \
52 (((unsigned long int) 1) << (((sig) - 1) % (8 * sizeof (unsigned long int))))
53
54 /* Return the word index for SIG. */
55 # define __sigword(sig) (((sig) - 1) / (8 * sizeof (unsigned long int)))
56
57 # if defined __GNUC__ && __GNUC__ >= 2
58 # define __sigemptyset(set) \
59 (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
60 sigset_t *__set = (set); \
61 while (--__cnt >= 0) __set->__val[__cnt] = 0; \
62 0; }))
63 # define __sigfillset(set) \
64 (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
65 sigset_t *__set = (set); \
66 while (--__cnt >= 0) __set->__val[__cnt] = ~0UL; \
67 0; }))
68
69 # ifdef __USE_GNU
70 /* The POSIX does not specify for handling the whole signal set in one
71 command. This is often wanted and so we define three more functions
72 here. */
73 # define __sigisemptyset(set) \
74 (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
75 const sigset_t *__set = (set); \
76 int __ret = __set->__val[--__cnt]; \
77 while (!__ret && --__cnt >= 0) \
78 __ret = __set->__val[__cnt]; \
79 __ret == 0; }))
80 # define __sigandset(dest, left, right) \
81 (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
82 sigset_t *__dest = (dest); \
83 const sigset_t *__left = (left); \
84 const sigset_t *__right = (right); \
85 while (--__cnt >= 0) \
86 __dest->__val[__cnt] = (__left->__val[__cnt] \
87 & __right->__val[__cnt]); \
88 0; }))
89 # define __sigorset(dest, left, right) \
90 (__extension__ ({ int __cnt = _SIGSET_NWORDS; \
91 sigset_t *__dest = (dest); \
92 const sigset_t *__left = (left); \
93 const sigset_t *__right = (right); \
94 while (--__cnt >= 0) \
95 __dest->__val[__cnt] = (__left->__val[__cnt] \
96 | __right->__val[__cnt]); \
97 0; }))
98 # endif
99 # endif
100
101 /* These functions needn't check for a bogus signal number -- error
102 checking is done in the non __ versions. */
103
104 extern int __sigismember (__const __sigset_t *, int);
105 extern int __sigaddset (__sigset_t *, int);
106 extern int __sigdelset (__sigset_t *, int);
107
108 # ifdef __USE_EXTERN_INLINES
109 # define __SIGSETFN(NAME, BODY, CONST) \
110 _EXTERN_INLINE int \
111 NAME (CONST __sigset_t *__set, int __sig) \
112 { \
113 unsigned long int __mask = __sigmask (__sig); \
114 unsigned long int __word = __sigword (__sig); \
115 return BODY; \
116 }
117
118 __SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, __const)
119 __SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), )
120 __SIGSETFN (__sigdelset, ((__set->__val[__word] &= ~__mask), 0), )
121
122 # undef __SIGSETFN
123 # endif
124
125
126 #endif /* ! _SIGSET_H_fns. */
127