include/linux/signal.h

   1 #ifndef _LINUX_SIGNAL_H
   2 #define _LINUX_SIGNAL_H
   3
   4 #include <asm/signal.h>
   5 #include <asm/siginfo.h>
   6
   7 #ifdef __KERNEL__
   8 /*
   9  * Real Time signals may be queued.
  10  */
  11
  12 struct signal_queue
  13 {
  14         struct signal_queue *next;
  15         siginfo_t info;
  16 };
  17
  18 /*
  19  * Define some primitives to manipulate sigset_t.
  20  */
  21
  22 #ifndef __HAVE_ARCH_SIG_BITOPS
  23 #include <asm/bitops.h>
  24
  25 /* We don't use <asm/bitops.h> for these because there is no need to
  26    be atomic.  */
  27 extern inline void sigaddset(sigset_t *set, int _sig)
  28 {
  29         unsigned long sig = _sig - 1;
  30         if (_NSIG_WORDS == 1)
  31                 set->sig[0] |= 1UL << sig;
  32         else
  33                 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
  34 }
  35
  36 extern inline void sigdelset(sigset_t *set, int _sig)
  37 {
  38         unsigned long sig = _sig - 1;
  39         if (_NSIG_WORDS == 1)
  40                 set->sig[0] &= ~(1UL << sig);
  41         else
  42                 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
  43 }
  44
  45 extern inline int sigismember(sigset_t *set, int _sig)
  46 {
  47         unsigned long sig = _sig - 1;
  48         if (_NSIG_WORDS == 1)
  49                 return 1 & (set->sig[0] >> sig);
  50         else
  51                 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
  52 }
  53
  54 extern inline int sigfindinword(unsigned long word)
  55 {
  56         return ffz(~word);
  57 }
  58
  59 #define sigmask(sig)    (1UL << ((sig) - 1))
  60
  61 #endif /* __HAVE_ARCH_SIG_BITOPS */
  62
  63 #ifndef __HAVE_ARCH_SIG_SETOPS
  64 #include <linux/string.h>
  65
  66 #define _SIG_SET_BINOP(name, op)                                        \
  67 extern inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
  68 {                                                                       \
  69         unsigned long a0, a1, a2, a3, b0, b1, b2, b3;                   \
  70         unsigned long i;                                                \
  71                                                                         \
  72         for (i = 0; i < _NSIG_WORDS/4; ++i) {                           \
  73                 a0 = a->sig[4*i+0]; a1 = a->sig[4*i+1];                 \
  74                 a2 = a->sig[4*i+2]; a3 = a->sig[4*i+3];                 \
  75                 b0 = b->sig[4*i+0]; b1 = b->sig[4*i+1];                 \
  76                 b2 = b->sig[4*i+2]; b3 = b->sig[4*i+3];                 \
  77                 r->sig[4*i+0] = op(a0, b0);                             \
  78                 r->sig[4*i+1] = op(a1, b1);                             \
  79                 r->sig[4*i+2] = op(a2, b2);                             \
  80                 r->sig[4*i+3] = op(a3, b3);                             \
  81         }                                                               \
  82         switch (_NSIG_WORDS % 4) {                                      \
  83             case 3:                                                     \
  84                 a0 = a->sig[4*i+0]; a1 = a->sig[4*i+1]; a2 = a->sig[4*i+2]; \
  85                 b0 = b->sig[4*i+0]; b1 = b->sig[4*i+1]; b2 = b->sig[4*i+2]; \
  86                 r->sig[4*i+0] = op(a0, b0);                             \
  87                 r->sig[4*i+1] = op(a1, b1);                             \
  88                 r->sig[4*i+2] = op(a2, b2);                             \
  89                 break;                                                  \
  90             case 2:                                                     \
  91                 a0 = a->sig[4*i+0]; a1 = a->sig[4*i+1];                 \
  92                 b0 = b->sig[4*i+0]; b1 = b->sig[4*i+1];                 \
  93                 r->sig[4*i+0] = op(a0, b0);                             \
  94                 r->sig[4*i+1] = op(a1, b1);                             \
  95                 break;                                                  \
  96             case 1:                                                     \
  97                 a0 = a->sig[4*i+0]; b0 = b->sig[4*i+0];                 \
  98                 r->sig[4*i+0] = op(a0, b0);                             \
  99                 break;                                                  \
 100         }                                                               \
 101 }
 102
 103 #define _sig_or(x,y)    ((x) | (y))
 104 _SIG_SET_BINOP(sigorsets, _sig_or)
 105
 106 #define _sig_and(x,y)   ((x) & (y))
 107 _SIG_SET_BINOP(sigandsets, _sig_and)
 108
 109 #define _sig_nand(x,y)  ((x) & ~(y))
 110 _SIG_SET_BINOP(signandsets, _sig_nand)
 111
 112 #undef _SIG_SET_BINOP
 113 #undef _sig_or
 114 #undef _sig_and
 115 #undef _sig_nand
 116
 117 #define _SIG_SET_OP(name, op)                                           \
 118 extern inline void name(sigset_t *set)                                  \
 119 {                                                                       \
 120         unsigned long i;                                                \
 121                                                                         \
 122         for (i = 0; i < _NSIG_WORDS/4; ++i) {                           \
 123                 set->sig[4*i+0] = op(set->sig[4*i+0]);                  \
 124                 set->sig[4*i+1] = op(set->sig[4*i+1]);                  \
 125                 set->sig[4*i+2] = op(set->sig[4*i+2]);                  \
 126                 set->sig[4*i+3] = op(set->sig[4*i+3]);                  \
 127         }                                                               \
 128         switch (_NSIG_WORDS % 4) {                                      \
 129             case 3: set->sig[4*i+2] = op(set->sig[4*i+2]);              \
 130             case 2: set->sig[4*i+1] = op(set->sig[4*i+1]);              \
 131             case 1: set->sig[4*i+0] = op(set->sig[4*i+0]);              \
 132         }                                                               \
 133 }
 134
 135 #define _sig_not(x)     (~(x))
 136 _SIG_SET_OP(signotset, _sig_not)
 137
 138 #undef _SIG_SET_OP
 139 #undef _sig_not
 140
 141 extern inline void sigemptyset(sigset_t *set)
 142 {
 143         switch (_NSIG_WORDS) {
 144         default:
 145                 memset(set, 0, sizeof(sigset_t));
 146                 break;
 147         case 2: set->sig[1] = 0;
 148         case 1: set->sig[0] = 0;
 149                 break;
 150         }
 151 }
 152
 153 extern inline void sigfillset(sigset_t *set)
 154 {
 155         switch (_NSIG_WORDS) {
 156         default:
 157                 memset(set, -1, sizeof(sigset_t));
 158                 break;
 159         case 2: set->sig[1] = -1;
 160         case 1: set->sig[0] = -1;
 161                 break;
 162         }
 163 }
 164
 165 /* Some extensions for manipulating the low 32 signals in particular.  */
 166
 167 extern inline void sigaddsetmask(sigset_t *set, unsigned long mask)
 168 {
 169         set->sig[0] |= mask;
 170 }
 171
 172 extern inline void sigdelsetmask(sigset_t *set, unsigned long mask)
 173 {
 174         set->sig[0] &= ~mask;
 175 }
 176
 177 extern inline int sigtestsetmask(sigset_t *set, unsigned long mask)
 178 {
 179         return (set->sig[0] & mask) != 0;
 180 }
 181
 182 extern inline void siginitset(sigset_t *set, unsigned long mask)
 183 {
 184         set->sig[0] = mask;
 185         switch (_NSIG_WORDS) {
 186         default:
 187                 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
 188                 break;
 189         case 2: set->sig[1] = 0;
 190         case 1:
 191         }
 192 }
 193
 194 extern inline void siginitsetinv(sigset_t *set, unsigned long mask)
 195 {
 196         set->sig[0] = ~mask;
 197         switch (_NSIG_WORDS) {
 198         default:
 199                 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
 200                 break;
 201         case 2: set->sig[1] = -1;
 202         case 1:
 203         }
 204 }
 205
 206 #endif /* __HAVE_ARCH_SIG_SETOPS */
 207
 208 #endif /* __KERNEL__ */
 209
 210 #endif /* _LINUX_SIGNAL_H */