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 #define MAX_SIGPENDING  1024
  12
  13 /*
  14  * Real Time signals may be queued.
  15  */
  16
  17 struct sigqueue {
  18         struct list_head list;
  19         spinlock_t *lock;
  20         int flags;
  21         siginfo_t info;
  22         struct user_struct *user;
  23 };
  24
  25 /* flags values. */
  26 #define SIGQUEUE_PREALLOC       1
  27
  28 struct sigpending {
  29         struct list_head list;
  30         sigset_t signal;
  31 };
  32
  33 /*
  34  * Define some primitives to manipulate sigset_t.
  35  */
  36
  37 #ifndef __HAVE_ARCH_SIG_BITOPS
  38 #include <linux/bitops.h>
  39
  40 /* We don't use <linux/bitops.h> for these because there is no need to
  41    be atomic.  */
  42 static inline void sigaddset(sigset_t *set, int _sig)
  43 {
  44         unsigned long sig = _sig - 1;
  45         if (_NSIG_WORDS == 1)
  46                 set->sig[0] |= 1UL << sig;
  47         else
  48                 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
  49 }
  50
  51 static inline void sigdelset(sigset_t *set, int _sig)
  52 {
  53         unsigned long sig = _sig - 1;
  54         if (_NSIG_WORDS == 1)
  55                 set->sig[0] &= ~(1UL << sig);
  56         else
  57                 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
  58 }
  59
  60 static inline int sigismember(sigset_t *set, int _sig)
  61 {
  62         unsigned long sig = _sig - 1;
  63         if (_NSIG_WORDS == 1)
  64                 return 1 & (set->sig[0] >> sig);
  65         else
  66                 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
  67 }
  68
  69 static inline int sigfindinword(unsigned long word)
  70 {
  71         return ffz(~word);
  72 }
  73
  74 #endif /* __HAVE_ARCH_SIG_BITOPS */
  75
  76 #define sigmask(sig)    (1UL << ((sig) - 1))
  77
  78 #ifndef __HAVE_ARCH_SIG_SETOPS
  79 #include <linux/string.h>
  80
  81 #define _SIG_SET_BINOP(name, op)                                        \
  82 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
  83 {                                                                       \
  84         extern void _NSIG_WORDS_is_unsupported_size(void);              \
  85         unsigned long a0, a1, a2, a3, b0, b1, b2, b3;                   \
  86                                                                         \
  87         switch (_NSIG_WORDS) {                                          \
  88             case 4:                                                     \
  89                 a3 = a->sig[3]; a2 = a->sig[2];                         \
  90                 b3 = b->sig[3]; b2 = b->sig[2];                         \
  91                 r->sig[3] = op(a3, b3);                                 \
  92                 r->sig[2] = op(a2, b2);                                 \
  93             case 2:                                                     \
  94                 a1 = a->sig[1]; b1 = b->sig[1];                         \
  95                 r->sig[1] = op(a1, b1);                                 \
  96             case 1:                                                     \
  97                 a0 = a->sig[0]; b0 = b->sig[0];                         \
  98                 r->sig[0] = op(a0, b0);                                 \
  99                 break;                                                  \
 100             default:                                                    \
 101                 _NSIG_WORDS_is_unsupported_size();                      \
 102         }                                                               \
 103 }
 104
 105 #define _sig_or(x,y)    ((x) | (y))
 106 _SIG_SET_BINOP(sigorsets, _sig_or)
 107
 108 #define _sig_and(x,y)   ((x) & (y))
 109 _SIG_SET_BINOP(sigandsets, _sig_and)
 110
 111 #define _sig_nand(x,y)  ((x) & ~(y))
 112 _SIG_SET_BINOP(signandsets, _sig_nand)
 113
 114 #undef _SIG_SET_BINOP
 115 #undef _sig_or
 116 #undef _sig_and
 117 #undef _sig_nand
 118
 119 #define _SIG_SET_OP(name, op)                                           \
 120 static inline void name(sigset_t *set)                                  \
 121 {                                                                       \
 122         extern void _NSIG_WORDS_is_unsupported_size(void);              \
 123                                                                         \
 124         switch (_NSIG_WORDS) {                                          \
 125             case 4: set->sig[3] = op(set->sig[3]);                      \
 126                     set->sig[2] = op(set->sig[2]);                      \
 127             case 2: set->sig[1] = op(set->sig[1]);                      \
 128             case 1: set->sig[0] = op(set->sig[0]);                      \
 129                     break;                                              \
 130             default:                                                    \
 131                 _NSIG_WORDS_is_unsupported_size();                      \
 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 static 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 static 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 static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
 168 {
 169         set->sig[0] |= mask;
 170 }
 171
 172 static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
 173 {
 174         set->sig[0] &= ~mask;
 175 }
 176
 177 static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
 178 {
 179         return (set->sig[0] & mask) != 0;
 180 }
 181
 182 static 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 static 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 static inline void init_sigpending(struct sigpending *sig)
 209 {
 210         sigemptyset(&sig->signal);
 211         INIT_LIST_HEAD(&sig->list);
 212 }
 213
 214 extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
 215 extern long do_sigpending(void __user *, unsigned long);
 216 extern int sigprocmask(int, sigset_t *, sigset_t *);
 217
 218 #ifndef HAVE_ARCH_GET_SIGNAL_TO_DELIVER
 219 struct pt_regs;
 220 extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
 221 #endif
 222
 223 #endif /* __KERNEL__ */
 224
 225 #endif /* _LINUX_SIGNAL_H */