1 /* __sig_atomic_t, __sigset_t, and related definitions. Linux 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 Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the 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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #ifndef _SIGSET_H_types
20 # define _SIGSET_H_types 1
22 typedef int __sig_atomic_t;
24 /* A 'sigset_t' has a bit for each signal.
25 * glibc has space for 1024 signals (!), but most arches supported
26 * by Linux have 64 signals, and only MIPS has 128.
27 * There seems to be some historical baggage in sparc[64]
28 * where they might have (or had in the past) 32 signals only,
29 * I hope it's irrelevant now.
30 * Signal 0 does not exist, so we have signals 1..64, not 0..63.
31 * In uclibc, kernel and userspace sigset_t is always the same.
32 * BTW, struct sigaction is also the same on kernel and userspace side.
35 # define _SIGSET_NWORDS (128 / (8 * sizeof (unsigned long)))
37 # define _SIGSET_NWORDS (64 / (8 * sizeof (unsigned long)))
40 unsigned long __val[_SIGSET_NWORDS];
46 /* We only want to define these functions if <signal.h> was actually
47 included; otherwise we were included just to define the types. Since we
48 are namespace-clean, it wouldn't hurt to define extra macros. But
49 trouble can be caused by functions being defined (e.g., any global
50 register vars declared later will cause compilation errors). */
52 #if !defined _SIGSET_H_fns && defined _SIGNAL_H
53 # define _SIGSET_H_fns 1
55 /* Return a mask that includes the bit for SIG only. */
56 /* Unsigned cast ensures shift/mask insns are used. */
57 # define __sigmask(sig) \
58 (((unsigned long) 1) << ((unsigned)((sig) - 1) % (8 * sizeof (unsigned long))))
60 /* Return the word index for SIG. */
61 # define __sigword(sig) ((unsigned)((sig) - 1) / (8 * sizeof (unsigned long)))
63 /* gcc 4.3.1 is not clever enough to optimize for _SIGSET_NWORDS == 1 and 2,
64 * which are about the only values which can be there */
66 # if defined __GNUC__ && __GNUC__ >= 2
67 # define __sigemptyset(set) \
69 sigset_t *__set = (set); \
70 if (_SIGSET_NWORDS <= 2) { \
71 __set->__val[0] = 0; \
72 if (_SIGSET_NWORDS == 2) \
73 __set->__val[1] = 0; \
75 int __cnt = _SIGSET_NWORDS; \
76 while (--__cnt >= 0) __set->__val[__cnt] = 0; \
80 # define __sigfillset(set) \
82 sigset_t *__set = (set); \
83 if (_SIGSET_NWORDS <= 2) { \
84 __set->__val[0] = ~0UL; \
85 if (_SIGSET_NWORDS == 2) \
86 __set->__val[1] = ~0UL; \
88 int __cnt = _SIGSET_NWORDS; \
89 while (--__cnt >= 0) __set->__val[__cnt] = ~0UL; \
95 /* The POSIX does not specify for handling the whole signal set in one
96 command. This is often wanted and so we define three more functions
98 # define __sigisemptyset(set) \
101 const sigset_t *__set = (set); \
102 if (_SIGSET_NWORDS == 1) { \
103 __ret = __set->__val[0]; \
104 } else if (_SIGSET_NWORDS == 2) { \
105 __ret = __set->__val[0] | __set->__val[1]; \
107 int __cnt = _SIGSET_NWORDS; \
108 __ret = __set->__val[--__cnt]; \
109 while (!__ret && --__cnt >= 0) \
110 __ret = __set->__val[__cnt]; \
114 # define __sigandset(dest, left, right) \
116 sigset_t *__dest = (dest); \
117 const sigset_t *__left = (left); \
118 const sigset_t *__right = (right); \
119 if (_SIGSET_NWORDS <= 2) { \
120 __dest->__val[0] = __left->__val[0] & __right->__val[0];\
121 if (_SIGSET_NWORDS == 2) \
122 __dest->__val[1] = __left->__val[1] & __right->__val[1];\
124 int __cnt = _SIGSET_NWORDS; \
125 while (--__cnt >= 0) \
126 __dest->__val[__cnt] = (__left->__val[__cnt] \
127 & __right->__val[__cnt]); \
131 # define __sigorset(dest, left, right) \
133 sigset_t *__dest = (dest); \
134 const sigset_t *__left = (left); \
135 const sigset_t *__right = (right); \
136 if (_SIGSET_NWORDS <= 2) { \
137 __dest->__val[0] = __left->__val[0] | __right->__val[0];\
138 if (_SIGSET_NWORDS == 2) \
139 __dest->__val[1] = __left->__val[1] | __right->__val[1];\
141 int __cnt = _SIGSET_NWORDS; \
142 while (--__cnt >= 0) \
143 __dest->__val[__cnt] = (__left->__val[__cnt] \
144 | __right->__val[__cnt]); \
151 /* These functions needn't check for a bogus signal number -- error
152 checking is done in the non __ versions. */
154 # if !defined __USE_EXTERN_INLINES || defined __PROVIDE_OUT_OF_LINE_SIGSETFN
155 extern int __sigismember (const __sigset_t *, int);
156 libc_hidden_proto(__sigismember)
157 extern int __sigaddset (__sigset_t *, int);
158 libc_hidden_proto(__sigaddset)
159 extern int __sigdelset (__sigset_t *, int);
160 libc_hidden_proto(__sigdelset)
163 # ifdef __USE_EXTERN_INLINES
164 # undef _EXTERN_INLINE
165 # ifdef __PROVIDE_OUT_OF_LINE_SIGSETFN
166 # define _EXTERN_INLINE
167 # else /* normal case */
168 /* dropped extern below: otherwise every module with __USE_EXTERN_INLINES
169 * will have its own copy of out-of line function emitted. */
170 # define _EXTERN_INLINE /*extern*/ __always_inline
172 # define __SIGSETFN(NAME, BODY, CONST) \
174 NAME (CONST __sigset_t *__set, int __sig) \
176 unsigned long __mask = __sigmask (__sig); \
177 unsigned __word = __sigword (__sig); \
181 __SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, const)
182 __SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), )
183 __SIGSETFN (__sigdelset, ((__set->__val[__word] &= ~__mask), 0), )
189 /* It's far too much PITA to __USE_EXTERN_INLINES from within libc.
190 * Especially since we want to inline only calls with const sig,
191 * but __USE_EXTERN_INLINES will inline all calls!
193 static __always_inline unsigned long
194 const_sigismember(const __sigset_t *set, int sig)
196 unsigned long mask = __sigmask(sig);
197 unsigned word = __sigword(sig);
198 return (set->__val[word] & mask);
200 # define __sigismember(set, sig) \
201 (__builtin_constant_p(sig) ? (const_sigismember(set, sig) != 0) : __sigismember(set, sig))
202 static __always_inline void
203 const_sigaddset(__sigset_t *set, int sig)
205 unsigned long mask = __sigmask(sig);
206 unsigned word = __sigword(sig);
207 set->__val[word] |= mask;
209 # define __sigaddset(set, sig) \
210 (__builtin_constant_p(sig) ? (const_sigaddset(set, sig), 0) : __sigaddset(set, sig))
211 static __always_inline void
212 const_sigdelset(__sigset_t *set, int sig)
214 unsigned long mask = __sigmask(sig);
215 unsigned word = __sigword(sig);
216 set->__val[word] &= ~mask;
218 # define __sigdelset(set, sig) \
219 (__builtin_constant_p(sig) ? (const_sigdelset(set, sig), 0) : __sigdelset(set, sig))
222 #endif /* ! _SIGSET_H_fns. */