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 sigqueue {
  13         struct sigqueue *next;
  14         siginfo_t info;
  15 };
  16
  17 struct sigpending {
  18         struct sigqueue *head, **tail;
  19         sigset_t signal;
  20 };
  21
  22 /*
  23  * Define some primitives to manipulate sigset_t.
  24  */
  25
  26 #ifndef __HAVE_ARCH_SIG_BITOPS
  27 #include <asm/bitops.h>
  28
  29 /* We don't use <asm/bitops.h> for these because there is no need to
  30    be atomic.  */
  31 static inline void sigaddset(sigset_t *set, int _sig)
  32 {
  33         unsigned long sig = _sig - 1;
  34         if (_NSIG_WORDS == 1)
  35                 set->sig[0] |= 1UL << sig;
  36         else
  37                 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
  38 }
  39
  40 static inline void sigdelset(sigset_t *set, int _sig)
  41 {
  42         unsigned long sig = _sig - 1;
  43         if (_NSIG_WORDS == 1)
  44                 set->sig[0] &= ~(1UL << sig);
  45         else
  46                 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
  47 }
  48
  49 static inline int sigismember(sigset_t *set, int _sig)
  50 {
  51         unsigned long sig = _sig - 1;
  52         if (_NSIG_WORDS == 1)
  53                 return 1 & (set->sig[0] >> sig);
  54         else
  55                 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
  56 }
  57
  58 static inline int sigfindinword(unsigned long word)
  59 {
  60         return ffz(~word);
  61 }
  62
  63 #define sigmask(sig)    (1UL << ((sig) - 1))
  64
  65 #endif /* __HAVE_ARCH_SIG_BITOPS */
  66
  67 #ifndef __HAVE_ARCH_SIG_SETOPS
  68 #include <linux/string.h>
  69
  70 #define _SIG_SET_BINOP(name, op)                                        \
  71 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
  72 {                                                                       \
  73         unsigned long a0, a1, a2, a3, b0, b1, b2, b3;                   \
  74         unsigned long i;                                                \
  75                                                                         \
  76         for (i = 0; i < _NSIG_WORDS/4; ++i) {                           \
  77                 a0 = a->sig[4*i+0]; a1 = a->sig[4*i+1];                 \
  78                 a2 = a->sig[4*i+2]; a3 = a->sig[4*i+3];                 \
  79                 b0 = b->sig[4*i+0]; b1 = b->sig[4*i+1];                 \
  80                 b2 = b->sig[4*i+2]; b3 = b->sig[4*i+3];                 \
  81                 r->sig[4*i+0] = op(a0, b0);                             \
  82                 r->sig[4*i+1] = op(a1, b1);                             \
  83                 r->sig[4*i+2] = op(a2, b2);                             \
  84                 r->sig[4*i+3] = op(a3, b3);                             \
  85         }                                                               \
  86         switch (_NSIG_WORDS % 4) {                                      \
  87             case 3:                                                     \
  88                 a0 = a->sig[4*i+0]; a1 = a->sig[4*i+1]; a2 = a->sig[4*i+2]; \
  89                 b0 = b->sig[4*i+0]; b1 = b->sig[4*i+1]; b2 = b->sig[4*i+2]; \
  90                 r->sig[4*i+0] = op(a0, b0);                             \
  91                 r->sig[4*i+1] = op(a1, b1);                             \
  92                 r->sig[4*i+2] = op(a2, b2);                             \
  93                 break;                                                  \
  94             case 2:                                                     \
  95                 a0 = a->sig[4*i+0]; a1 = a->sig[4*i+1];                 \
  96                 b0 = b->sig[4*i+0]; b1 = b->sig[4*i+1];                 \
  97                 r->sig[4*i+0] = op(a0, b0);                             \
  98                 r->sig[4*i+1] = op(a1, b1);                             \
  99                 break;                                                  \
 100             case 1:                                                     \
 101                 a0 = a->sig[4*i+0]; b0 = b->sig[4*i+0];                 \
 102                 r->sig[4*i+0] = op(a0, b0);                             \
 103                 break;                                                  \
 104         }                                                               \
 105 }
 106
 107 #define _sig_or(x,y)    ((x) | (y))
 108 _SIG_SET_BINOP(sigorsets, _sig_or)
 109
 110 #define _sig_and(x,y)   ((x) & (y))
 111 _SIG_SET_BINOP(sigandsets, _sig_and)
 112
 113 #define _sig_nand(x,y)  ((x) & ~(y))
 114 _SIG_SET_BINOP(signandsets, _sig_nand)
 115
 116 #undef _SIG_SET_BINOP
 117 #undef _sig_or
 118 #undef _sig_and
 119 #undef _sig_nand
 120
 121 #define _SIG_SET_OP(name, op)                                           \
 122 static inline void name(sigset_t *set)                                  \
 123 {                                                                       \
 124         unsigned long i;                                                \
 125                                                                         \
 126         for (i = 0; i < _NSIG_WORDS/4; ++i) {                           \
 127                 set->sig[4*i+0] = op(set->sig[4*i+0]);                  \
 128                 set->sig[4*i+1] = op(set->sig[4*i+1]);                  \
 129                 set->sig[4*i+2] = op(set->sig[4*i+2]);                  \
 130                 set->sig[4*i+3] = op(set->sig[4*i+3]);                  \
 131         }                                                               \
 132         switch (_NSIG_WORDS % 4) {                                      \
 133             case 3: set->sig[4*i+2] = op(set->sig[4*i+2]);              \
 134             case 2: set->sig[4*i+1] = op(set->sig[4*i+1]);              \
 135             case 1: set->sig[4*i+0] = op(set->sig[4*i+0]);              \
 136         }                                                               \
 137 }
 138
 139 #define _sig_not(x)     (~(x))
 140 _SIG_SET_OP(signotset, _sig_not)
 141
 142 #undef _SIG_SET_OP
 143 #undef _sig_not
 144
 145 static inline void sigemptyset(sigset_t *set)
 146 {
 147         switch (_NSIG_WORDS) {
 148         default:
 149                 memset(set, 0, sizeof(sigset_t));
 150                 break;
 151         case 2: set->sig[1] = 0;
 152         case 1: set->sig[0] = 0;
 153                 break;
 154         }
 155 }
 156
 157 static inline void sigfillset(sigset_t *set)
 158 {
 159         switch (_NSIG_WORDS) {
 160         default:
 161                 memset(set, -1, sizeof(sigset_t));
 162                 break;
 163         case 2: set->sig[1] = -1;
 164         case 1: set->sig[0] = -1;
 165                 break;
 166         }
 167 }
 168
 169 extern char * render_sigset_t(sigset_t *set, char *buffer);
 170
 171 /* Some extensions for manipulating the low 32 signals in particular.  */
 172
 173 static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
 174 {
 175         set->sig[0] |= mask;
 176 }
 177
 178 static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
 179 {
 180         set->sig[0] &= ~mask;
 181 }
 182
 183 static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
 184 {
 185         return (set->sig[0] & mask) != 0;
 186 }
 187
 188 static inline void siginitset(sigset_t *set, unsigned long mask)
 189 {
 190         set->sig[0] = mask;
 191         switch (_NSIG_WORDS) {
 192         default:
 193                 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
 194                 break;
 195         case 2: set->sig[1] = 0;
 196         case 1: ;
 197         }
 198 }
 199
 200 static inline void siginitsetinv(sigset_t *set, unsigned long mask)
 201 {
 202         set->sig[0] = ~mask;
 203         switch (_NSIG_WORDS) {
 204         default:
 205                 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
 206                 break;
 207         case 2: set->sig[1] = -1;
 208         case 1: ;
 209         }
 210 }
 211
 212 #endif /* __HAVE_ARCH_SIG_SETOPS */
 213
 214 static inline void init_sigpending(struct sigpending *sig)
 215 {
 216         sigemptyset(&sig->signal);
 217         sig->head = NULL;
 218         sig->tail = &sig->head;
 219 }
 220
 221 extern long do_sigpending(void *, unsigned long);
 222
 223 #endif /* __KERNEL__ */
 224
 225 #endif /* _LINUX_SIGNAL_H */