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