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