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  * These values of sa_flags are used only by the kernel as part of the
  13  * irq handling routines.
  14  *
  15  * SA_INTERRUPT is also used by the irq handling routines.
  16  * SA_SHIRQ is for shared interrupt support on PCI and EISA.
  17  */
  18 #define SA_PROBE                SA_ONESHOT
  19 #define SA_SAMPLE_RANDOM        SA_RESTART
  20 #define SA_SHIRQ                0x04000000
  21
  22 /*
  23  * Real Time signals may be queued.
  24  */
  25
  26 struct sigqueue {
  27         struct list_head list;
  28         int flags;
  29         siginfo_t info;
  30         struct user_struct *user;
  31 };
  32
  33 /* flags values. */
  34 #define SIGQUEUE_PREALLOC       1
  35
  36 struct sigpending {
  37         struct list_head list;
  38         sigset_t signal;
  39 };
  40
  41 /*
  42  * Define some primitives to manipulate sigset_t.
  43  */
  44
  45 #ifndef __HAVE_ARCH_SIG_BITOPS
  46 #include <linux/bitops.h>
  47
  48 /* We don't use <linux/bitops.h> for these because there is no need to
  49    be atomic.  */
  50 static inline void sigaddset(sigset_t *set, int _sig)
  51 {
  52         unsigned long sig = _sig - 1;
  53         if (_NSIG_WORDS == 1)
  54                 set->sig[0] |= 1UL << sig;
  55         else
  56                 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
  57 }
  58
  59 static inline void sigdelset(sigset_t *set, int _sig)
  60 {
  61         unsigned long sig = _sig - 1;
  62         if (_NSIG_WORDS == 1)
  63                 set->sig[0] &= ~(1UL << sig);
  64         else
  65                 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
  66 }
  67
  68 static inline int sigismember(sigset_t *set, int _sig)
  69 {
  70         unsigned long sig = _sig - 1;
  71         if (_NSIG_WORDS == 1)
  72                 return 1 & (set->sig[0] >> sig);
  73         else
  74                 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
  75 }
  76
  77 static inline int sigfindinword(unsigned long word)
  78 {
  79         return ffz(~word);
  80 }
  81
  82 #endif /* __HAVE_ARCH_SIG_BITOPS */
  83
  84 #define sigmask(sig)    (1UL << ((sig) - 1))
  85
  86 #ifndef __HAVE_ARCH_SIG_SETOPS
  87 #include <linux/string.h>
  88
  89 #define _SIG_SET_BINOP(name, op)                                        \
  90 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
  91 {                                                                       \
  92         extern void _NSIG_WORDS_is_unsupported_size(void);              \
  93         unsigned long a0, a1, a2, a3, b0, b1, b2, b3;                   \
  94                                                                         \
  95         switch (_NSIG_WORDS) {                                          \
  96             case 4:                                                     \
  97                 a3 = a->sig[3]; a2 = a->sig[2];                         \
  98                 b3 = b->sig[3]; b2 = b->sig[2];                         \
  99                 r->sig[3] = op(a3, b3);                                 \
 100                 r->sig[2] = op(a2, b2);                                 \
 101             case 2:                                                     \
 102                 a1 = a->sig[1]; b1 = b->sig[1];                         \
 103                 r->sig[1] = op(a1, b1);                                 \
 104             case 1:                                                     \
 105                 a0 = a->sig[0]; b0 = b->sig[0];                         \
 106                 r->sig[0] = op(a0, b0);                                 \
 107                 break;                                                  \
 108             default:                                                    \
 109                 _NSIG_WORDS_is_unsupported_size();                      \
 110         }                                                               \
 111 }
 112
 113 #define _sig_or(x,y)    ((x) | (y))
 114 _SIG_SET_BINOP(sigorsets, _sig_or)
 115
 116 #define _sig_and(x,y)   ((x) & (y))
 117 _SIG_SET_BINOP(sigandsets, _sig_and)
 118
 119 #define _sig_nand(x,y)  ((x) & ~(y))
 120 _SIG_SET_BINOP(signandsets, _sig_nand)
 121
 122 #undef _SIG_SET_BINOP
 123 #undef _sig_or
 124 #undef _sig_and
 125 #undef _sig_nand
 126
 127 #define _SIG_SET_OP(name, op)                                           \
 128 static inline void name(sigset_t *set)                                  \
 129 {                                                                       \
 130         extern void _NSIG_WORDS_is_unsupported_size(void);              \
 131                                                                         \
 132         switch (_NSIG_WORDS) {                                          \
 133             case 4: set->sig[3] = op(set->sig[3]);                      \
 134                     set->sig[2] = op(set->sig[2]);                      \
 135             case 2: set->sig[1] = op(set->sig[1]);                      \
 136             case 1: set->sig[0] = op(set->sig[0]);                      \
 137                     break;                                              \
 138             default:                                                    \
 139                 _NSIG_WORDS_is_unsupported_size();                      \
 140         }                                                               \
 141 }
 142
 143 #define _sig_not(x)     (~(x))
 144 _SIG_SET_OP(signotset, _sig_not)
 145
 146 #undef _SIG_SET_OP
 147 #undef _sig_not
 148
 149 static inline void sigemptyset(sigset_t *set)
 150 {
 151         switch (_NSIG_WORDS) {
 152         default:
 153                 memset(set, 0, sizeof(sigset_t));
 154                 break;
 155         case 2: set->sig[1] = 0;
 156         case 1: set->sig[0] = 0;
 157                 break;
 158         }
 159 }
 160
 161 static inline void sigfillset(sigset_t *set)
 162 {
 163         switch (_NSIG_WORDS) {
 164         default:
 165                 memset(set, -1, sizeof(sigset_t));
 166                 break;
 167         case 2: set->sig[1] = -1;
 168         case 1: set->sig[0] = -1;
 169                 break;
 170         }
 171 }
 172
 173 /* Some extensions for manipulating the low 32 signals in particular.  */
 174
 175 static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
 176 {
 177         set->sig[0] |= mask;
 178 }
 179
 180 static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
 181 {
 182         set->sig[0] &= ~mask;
 183 }
 184
 185 static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
 186 {
 187         return (set->sig[0] & mask) != 0;
 188 }
 189
 190 static inline void siginitset(sigset_t *set, unsigned long mask)
 191 {
 192         set->sig[0] = mask;
 193         switch (_NSIG_WORDS) {
 194         default:
 195                 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
 196                 break;
 197         case 2: set->sig[1] = 0;
 198         case 1: ;
 199         }
 200 }
 201
 202 static inline void siginitsetinv(sigset_t *set, unsigned long mask)
 203 {
 204         set->sig[0] = ~mask;
 205         switch (_NSIG_WORDS) {
 206         default:
 207                 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
 208                 break;
 209         case 2: set->sig[1] = -1;
 210         case 1: ;
 211         }
 212 }
 213
 214 #endif /* __HAVE_ARCH_SIG_SETOPS */
 215
 216 static inline void init_sigpending(struct sigpending *sig)
 217 {
 218         sigemptyset(&sig->signal);
 219         INIT_LIST_HEAD(&sig->list);
 220 }
 221
 222 /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
 223 static inline int valid_signal(unsigned long sig)
 224 {
 225         return sig <= _NSIG ? 1 : 0;
 226 }
 227
 228 extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
 229 extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
 230 extern long do_sigpending(void __user *, unsigned long);
 231 extern int sigprocmask(int, sigset_t *, sigset_t *);
 232
 233 struct pt_regs;
 234 extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
 235
 236 #endif /* __KERNEL__ */
 237
 238 #endif /* _LINUX_SIGNAL_H */