include/linux/signal.h

   1 #ifndef _LINUX_SIGNAL_H
   2 #define _LINUX_SIGNAL_H
   3
   4 #include <linux/list.h>
   5 #include <linux/spinlock.h>
   6 #include <asm/signal.h>
   7 #include <asm/siginfo.h>
   8
   9 #ifdef __KERNEL__
  10 /*
  11  * Real Time signals may be queued.
  12  */
  13
  14 struct sigqueue {
  15         struct list_head list;
  16         spinlock_t *lock;
  17         int flags;
  18         siginfo_t info;
  19 };
  20
  21 /* flags values. */
  22 #define SIGQUEUE_PREALLOC       1
  23
  24 struct sigpending {
  25         struct list_head list;
  26         sigset_t signal;
  27 };
  28
  29 /*
  30  * Define some primitives to manipulate sigset_t.
  31  */
  32
  33 #ifndef __HAVE_ARCH_SIG_BITOPS
  34 #include <linux/bitops.h>
  35
  36 /* We don't use <linux/bitops.h> for these because there is no need to
  37    be atomic.  */
  38 static inline void sigaddset(sigset_t *set, int _sig)
  39 {
  40         unsigned long sig = _sig - 1;
  41         if (_NSIG_WORDS == 1)
  42                 set->sig[0] |= 1UL << sig;
  43         else
  44                 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
  45 }
  46
  47 static inline void sigdelset(sigset_t *set, int _sig)
  48 {
  49         unsigned long sig = _sig - 1;
  50         if (_NSIG_WORDS == 1)
  51                 set->sig[0] &= ~(1UL << sig);
  52         else
  53                 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
  54 }
  55
  56 static inline int sigismember(sigset_t *set, int _sig)
  57 {
  58         unsigned long sig = _sig - 1;
  59         if (_NSIG_WORDS == 1)
  60                 return 1 & (set->sig[0] >> sig);
  61         else
  62                 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
  63 }
  64
  65 static inline int sigfindinword(unsigned long word)
  66 {
  67         return ffz(~word);
  68 }
  69
  70 #endif /* __HAVE_ARCH_SIG_BITOPS */
  71
  72 #define sigmask(sig)    (1UL << ((sig) - 1))
  73
  74 #ifndef __HAVE_ARCH_SIG_SETOPS
  75 #include <linux/string.h>
  76
  77 #define _SIG_SET_BINOP(name, op)                                        \
  78 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
  79 {                                                                       \
  80         extern void _NSIG_WORDS_is_unsupported_size(void);              \
  81         unsigned long a0, a1, a2, a3, b0, b1, b2, b3;                   \
  82                                                                         \
  83         switch (_NSIG_WORDS) {                                          \
  84             case 4:                                                     \
  85                 a3 = a->sig[3]; a2 = a->sig[2];                         \
  86                 b3 = b->sig[3]; b2 = b->sig[2];                         \
  87                 r->sig[3] = op(a3, b3);                                 \
  88                 r->sig[2] = op(a2, b2);                                 \
  89             case 2:                                                     \
  90                 a1 = a->sig[1]; b1 = b->sig[1];                         \
  91                 r->sig[1] = op(a1, b1);                                 \
  92             case 1:                                                     \
  93                 a0 = a->sig[0]; b0 = b->sig[0];                         \
  94                 r->sig[0] = op(a0, b0);                                 \
  95                 break;                                                  \
  96             default:                                                    \
  97                 _NSIG_WORDS_is_unsupported_size();                      \
  98         }                                                               \
  99 }
 100
 101 #define _sig_or(x,y)    ((x) | (y))
 102 _SIG_SET_BINOP(sigorsets, _sig_or)
 103
 104 #define _sig_and(x,y)   ((x) & (y))
 105 _SIG_SET_BINOP(sigandsets, _sig_and)
 106
 107 #define _sig_nand(x,y)  ((x) & ~(y))
 108 _SIG_SET_BINOP(signandsets, _sig_nand)
 109
 110 #undef _SIG_SET_BINOP
 111 #undef _sig_or
 112 #undef _sig_and
 113 #undef _sig_nand
 114
 115 #define _SIG_SET_OP(name, op)                                           \
 116 static inline void name(sigset_t *set)                                  \
 117 {                                                                       \
 118         extern void _NSIG_WORDS_is_unsupported_size(void);              \
 119                                                                         \
 120         switch (_NSIG_WORDS) {                                          \
 121             case 4: set->sig[3] = op(set->sig[3]);                      \
 122                     set->sig[2] = op(set->sig[2]);                      \
 123             case 2: set->sig[1] = op(set->sig[1]);                      \
 124             case 1: set->sig[0] = op(set->sig[0]);                      \
 125                     break;                                              \
 126             default:                                                    \
 127                 _NSIG_WORDS_is_unsupported_size();                      \
 128         }                                                               \
 129 }
 130
 131 #define _sig_not(x)     (~(x))
 132 _SIG_SET_OP(signotset, _sig_not)
 133
 134 #undef _SIG_SET_OP
 135 #undef _sig_not
 136
 137 static inline void sigemptyset(sigset_t *set)
 138 {
 139         switch (_NSIG_WORDS) {
 140         default:
 141                 memset(set, 0, sizeof(sigset_t));
 142                 break;
 143         case 2: set->sig[1] = 0;
 144         case 1: set->sig[0] = 0;
 145                 break;
 146         }
 147 }
 148
 149 static inline void sigfillset(sigset_t *set)
 150 {
 151         switch (_NSIG_WORDS) {
 152         default:
 153                 memset(set, -1, sizeof(sigset_t));
 154                 break;
 155         case 2: set->sig[1] = -1;
 156         case 1: set->sig[0] = -1;
 157                 break;
 158         }
 159 }
 160
 161 /* Some extensions for manipulating the low 32 signals in particular.  */
 162
 163 static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
 164 {
 165         set->sig[0] |= mask;
 166 }
 167
 168 static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
 169 {
 170         set->sig[0] &= ~mask;
 171 }
 172
 173 static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
 174 {
 175         return (set->sig[0] & mask) != 0;
 176 }
 177
 178 static inline void siginitset(sigset_t *set, unsigned long mask)
 179 {
 180         set->sig[0] = mask;
 181         switch (_NSIG_WORDS) {
 182         default:
 183                 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
 184                 break;
 185         case 2: set->sig[1] = 0;
 186         case 1: ;
 187         }
 188 }
 189
 190 static inline void siginitsetinv(sigset_t *set, unsigned long mask)
 191 {
 192         set->sig[0] = ~mask;
 193         switch (_NSIG_WORDS) {
 194         default:
 195                 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
 196                 break;
 197         case 2: set->sig[1] = -1;
 198         case 1: ;
 199         }
 200 }
 201
 202 #endif /* __HAVE_ARCH_SIG_SETOPS */
 203
 204 static inline void init_sigpending(struct sigpending *sig)
 205 {
 206         sigemptyset(&sig->signal);
 207         INIT_LIST_HEAD(&sig->list);
 208 }
 209
 210 extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
 211 extern long do_sigpending(void __user *, unsigned long);
 212 extern int sigprocmask(int, sigset_t *, sigset_t *);
 213
 214 #ifndef HAVE_ARCH_GET_SIGNAL_TO_DELIVER
 215 struct pt_regs;
 216 extern int get_signal_to_deliver(siginfo_t *info, struct pt_regs *regs, void *cookie);
 217 #endif
 218
 219 #endif /* __KERNEL__ */
 220
 221 #endif /* _LINUX_SIGNAL_H */