release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/sysroot/usr/include/bits/sigset.h

   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.
   4
   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.
   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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 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  * glibc has space for 1024 signals (!), but most arches supported
  27  * by Linux have 64 signals, and only MIPS has 128.
  28  * There seems to be some historical baggage in sparc[64]
  29  * where they might have (or had in the past) 32 signals only,
  30  * I hope it's irrelevant now.
  31  * Signal 0 does not exist, so we have signals 1..64, not 0..63.
  32  * In uclibc, kernel and userspace sigset_t is always the same.
  33  * BTW, struct sigaction is also the same on kernel and userspace side.
  34  */
  35 #if defined(__mips__)
  36 # define _SIGSET_NWORDS (128 / (8 * sizeof (unsigned long)))
  37 #else
  38 # define _SIGSET_NWORDS (64 / (8 * sizeof (unsigned long)))
  39 #endif
  40 typedef struct {
  41         unsigned long __val[_SIGSET_NWORDS];
  42 } __sigset_t;
  43
  44 #endif
  45
  46
  47 /* We only want to define these functions if <signal.h> was actually
  48    included; otherwise we were included just to define the types.  Since we
  49    are namespace-clean, it wouldn't hurt to define extra macros.  But
  50    trouble can be caused by functions being defined (e.g., any global
  51    register vars declared later will cause compilation errors).  */
  52
  53 #if !defined _SIGSET_H_fns && defined _SIGNAL_H
  54 # define _SIGSET_H_fns 1
  55
  56 /* Return a mask that includes the bit for SIG only.  */
  57 /* Unsigned cast ensures shift/mask insns are used.  */
  58 # define __sigmask(sig) \
  59   (((unsigned long) 1) << ((unsigned)((sig) - 1) % (8 * sizeof (unsigned long))))
  60
  61 /* Return the word index for SIG.  */
  62 # define __sigword(sig) ((unsigned)((sig) - 1) / (8 * sizeof (unsigned long)))
  63
  64 /* gcc 4.3.1 is not clever enough to optimize for _SIGSET_NWORDS == 1 and 2,
  65  * which are about the only values which can be there */
  66
  67 # if defined __GNUC__ && __GNUC__ >= 2
  68 #  define __sigemptyset(set) \
  69 (__extension__ ({ \
  70         sigset_t *__set = (set);                                        \
  71         if (_SIGSET_NWORDS <= 2) {                                      \
  72                 __set->__val[0] = 0;                                    \
  73                 if (_SIGSET_NWORDS == 2)                                \
  74                         __set->__val[1] = 0;                            \
  75         } else {                                                        \
  76                 int __cnt = _SIGSET_NWORDS;                             \
  77                 while (--__cnt >= 0) __set->__val[__cnt] = 0;           \
  78         }                                                               \
  79         0;                                                              \
  80 }))
  81 #  define __sigfillset(set) \
  82 (__extension__ ({ \
  83         sigset_t *__set = (set);                                        \
  84         if (_SIGSET_NWORDS <= 2) {                                      \
  85                 __set->__val[0] = ~0UL;                                 \
  86                 if (_SIGSET_NWORDS == 2)                                \
  87                         __set->__val[1] = ~0UL;                         \
  88         } else {                                                        \
  89                 int __cnt = _SIGSET_NWORDS;                             \
  90                 while (--__cnt >= 0) __set->__val[__cnt] = ~0UL;        \
  91         }                                                               \
  92         0;                                                              \
  93 }))
  94
  95 #  ifdef __USE_GNU
  96 /* The POSIX does not specify for handling the whole signal set in one
  97    command.  This is often wanted and so we define three more functions
  98    here.  */
  99 #   define __sigisemptyset(set) \
 100 (__extension__ ({ \
 101         long __ret;                                                     \
 102         const sigset_t *__set = (set);                                  \
 103         if (_SIGSET_NWORDS == 1) {                                      \
 104                 __ret = __set->__val[0];                                \
 105         } else if (_SIGSET_NWORDS == 2) {                               \
 106                 __ret = __set->__val[0] | __set->__val[1];              \
 107         } else {                                                        \
 108                 int __cnt = _SIGSET_NWORDS;                             \
 109                 __ret = __set->__val[--__cnt];                          \
 110                 while (!__ret && --__cnt >= 0)                          \
 111                         __ret = __set->__val[__cnt];                    \
 112         }                                                               \
 113         __ret == 0;                                                     \
 114 }))
 115 #   define __sigandset(dest, left, right) \
 116 (__extension__ ({ \
 117         sigset_t *__dest = (dest);                                      \
 118         const sigset_t *__left = (left);                                \
 119         const sigset_t *__right = (right);                              \
 120         if (_SIGSET_NWORDS <= 2) {                                      \
 121                 __dest->__val[0] = __left->__val[0] & __right->__val[0];\
 122                 if (_SIGSET_NWORDS == 2)                                \
 123                         __dest->__val[1] = __left->__val[1] & __right->__val[1];\
 124         } else {                                                        \
 125                 int __cnt = _SIGSET_NWORDS;                             \
 126                 while (--__cnt >= 0)                                    \
 127                         __dest->__val[__cnt] = (__left->__val[__cnt]    \
 128                                         & __right->__val[__cnt]);       \
 129         }                                                               \
 130         0;                                                              \
 131 }))
 132 #   define __sigorset(dest, left, right) \
 133 (__extension__ ({ \
 134         sigset_t *__dest = (dest);                                      \
 135         const sigset_t *__left = (left);                                \
 136         const sigset_t *__right = (right);                              \
 137         if (_SIGSET_NWORDS <= 2) {                                      \
 138                 __dest->__val[0] = __left->__val[0] | __right->__val[0];\
 139                 if (_SIGSET_NWORDS == 2)                                \
 140                         __dest->__val[1] = __left->__val[1] | __right->__val[1];\
 141         } else {                                                        \
 142                 int __cnt = _SIGSET_NWORDS;                             \
 143                 while (--__cnt >= 0)                                    \
 144                         __dest->__val[__cnt] = (__left->__val[__cnt]    \
 145                                         | __right->__val[__cnt]);       \
 146         }                                                               \
 147         0;                                                              \
 148 }))
 149 #  endif
 150 # endif
 151
 152 /* These functions needn't check for a bogus signal number -- error
 153    checking is done in the non __ versions.  */
 154
 155 # if !defined __USE_EXTERN_INLINES || defined __PROVIDE_OUT_OF_LINE_SIGSETFN
 156 extern int __sigismember (__const __sigset_t *, int);
 157 extern int __sigaddset (__sigset_t *, int);
 158 extern int __sigdelset (__sigset_t *, int);
 159 # endif
 160
 161 # ifdef __USE_EXTERN_INLINES
 162 #  undef _EXTERN_INLINE
 163 #  ifdef __PROVIDE_OUT_OF_LINE_SIGSETFN
 164 #   define _EXTERN_INLINE
 165 #  else /* normal case */
 166     /* dropped extern below: otherwise every module with __USE_EXTERN_INLINES
 167      * will have its own copy of out-of line function emitted. */
 168 #   define _EXTERN_INLINE /*extern*/ __always_inline
 169 #  endif
 170 #  define __SIGSETFN(NAME, BODY, CONST)                                 \
 171 _EXTERN_INLINE int                                                      \
 172 NAME (CONST __sigset_t *__set, int __sig)                               \
 173 {                                                                       \
 174         unsigned long __mask = __sigmask (__sig);                       \
 175         unsigned __word = __sigword (__sig);                            \
 176         return BODY;                                                    \
 177 }
 178
 179 __SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, __const)
 180 __SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), )
 181 __SIGSETFN (__sigdelset, ((__set->__val[__word] &= ~__mask), 0), )
 182
 183 #  undef __SIGSETFN
 184 # endif
 185
 186
 187 #endif /* ! _SIGSET_H_fns.  */