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  * SA_PROBEIRQ is set by callers when they expect sharing mismatches to occur
  18  */
  19 #define SA_SAMPLE_RANDOM        SA_RESTART
  20 #define SA_SHIRQ                0x04000000
  21 #define SA_PROBEIRQ             0x08000000
  22
  23 /*
  24  * As above, these correspond to the IORESOURCE_IRQ_* defines in
  25  * linux/ioport.h to select the interrupt line behaviour.  When
  26  * requesting an interrupt without specifying a SA_TRIGGER, the
  27  * setting should be assumed to be "as already configured", which
  28  * may be as per machine or firmware initialisation.
  29  */
  30 #define SA_TRIGGER_LOW          0x00000008
  31 #define SA_TRIGGER_HIGH         0x00000004
  32 #define SA_TRIGGER_FALLING      0x00000002
  33 #define SA_TRIGGER_RISING       0x00000001
  34 #define SA_TRIGGER_MASK (SA_TRIGGER_HIGH|SA_TRIGGER_LOW|\
  35                                  SA_TRIGGER_RISING|SA_TRIGGER_FALLING)
  36
  37 /*
  38  * Real Time signals may be queued.
  39  */
  40
  41 struct sigqueue {
  42         struct list_head list;
  43         int flags;
  44         siginfo_t info;
  45         struct user_struct *user;
  46 };
  47
  48 /* flags values. */
  49 #define SIGQUEUE_PREALLOC       1
  50
  51 struct sigpending {
  52         struct list_head list;
  53         sigset_t signal;
  54 };
  55
  56 /*
  57  * Define some primitives to manipulate sigset_t.
  58  */
  59
  60 #ifndef __HAVE_ARCH_SIG_BITOPS
  61 #include <linux/bitops.h>
  62
  63 /* We don't use <linux/bitops.h> for these because there is no need to
  64    be atomic.  */
  65 static inline void sigaddset(sigset_t *set, int _sig)
  66 {
  67         unsigned long sig = _sig - 1;
  68         if (_NSIG_WORDS == 1)
  69                 set->sig[0] |= 1UL << sig;
  70         else
  71                 set->sig[sig / _NSIG_BPW] |= 1UL << (sig % _NSIG_BPW);
  72 }
  73
  74 static inline void sigdelset(sigset_t *set, int _sig)
  75 {
  76         unsigned long sig = _sig - 1;
  77         if (_NSIG_WORDS == 1)
  78                 set->sig[0] &= ~(1UL << sig);
  79         else
  80                 set->sig[sig / _NSIG_BPW] &= ~(1UL << (sig % _NSIG_BPW));
  81 }
  82
  83 static inline int sigismember(sigset_t *set, int _sig)
  84 {
  85         unsigned long sig = _sig - 1;
  86         if (_NSIG_WORDS == 1)
  87                 return 1 & (set->sig[0] >> sig);
  88         else
  89                 return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
  90 }
  91
  92 static inline int sigfindinword(unsigned long word)
  93 {
  94         return ffz(~word);
  95 }
  96
  97 #endif /* __HAVE_ARCH_SIG_BITOPS */
  98
  99 static inline int sigisemptyset(sigset_t *set)
 100 {
 101         extern void _NSIG_WORDS_is_unsupported_size(void);
 102         switch (_NSIG_WORDS) {
 103         case 4:
 104                 return (set->sig[3] | set->sig[2] |
 105                         set->sig[1] | set->sig[0]) == 0;
 106         case 2:
 107                 return (set->sig[1] | set->sig[0]) == 0;
 108         case 1:
 109                 return set->sig[0] == 0;
 110         default:
 111                 _NSIG_WORDS_is_unsupported_size();
 112                 return 0;
 113         }
 114 }
 115
 116 #define sigmask(sig)    (1UL << ((sig) - 1))
 117
 118 #ifndef __HAVE_ARCH_SIG_SETOPS
 119 #include <linux/string.h>
 120
 121 #define _SIG_SET_BINOP(name, op)                                        \
 122 static inline void name(sigset_t *r, const sigset_t *a, const sigset_t *b) \
 123 {                                                                       \
 124         extern void _NSIG_WORDS_is_unsupported_size(void);              \
 125         unsigned long a0, a1, a2, a3, b0, b1, b2, b3;                   \
 126                                                                         \
 127         switch (_NSIG_WORDS) {                                          \
 128             case 4:                                                     \
 129                 a3 = a->sig[3]; a2 = a->sig[2];                         \
 130                 b3 = b->sig[3]; b2 = b->sig[2];                         \
 131                 r->sig[3] = op(a3, b3);                                 \
 132                 r->sig[2] = op(a2, b2);                                 \
 133             case 2:                                                     \
 134                 a1 = a->sig[1]; b1 = b->sig[1];                         \
 135                 r->sig[1] = op(a1, b1);                                 \
 136             case 1:                                                     \
 137                 a0 = a->sig[0]; b0 = b->sig[0];                         \
 138                 r->sig[0] = op(a0, b0);                                 \
 139                 break;                                                  \
 140             default:                                                    \
 141                 _NSIG_WORDS_is_unsupported_size();                      \
 142         }                                                               \
 143 }
 144
 145 #define _sig_or(x,y)    ((x) | (y))
 146 _SIG_SET_BINOP(sigorsets, _sig_or)
 147
 148 #define _sig_and(x,y)   ((x) & (y))
 149 _SIG_SET_BINOP(sigandsets, _sig_and)
 150
 151 #define _sig_nand(x,y)  ((x) & ~(y))
 152 _SIG_SET_BINOP(signandsets, _sig_nand)
 153
 154 #undef _SIG_SET_BINOP
 155 #undef _sig_or
 156 #undef _sig_and
 157 #undef _sig_nand
 158
 159 #define _SIG_SET_OP(name, op)                                           \
 160 static inline void name(sigset_t *set)                                  \
 161 {                                                                       \
 162         extern void _NSIG_WORDS_is_unsupported_size(void);              \
 163                                                                         \
 164         switch (_NSIG_WORDS) {                                          \
 165             case 4: set->sig[3] = op(set->sig[3]);                      \
 166                     set->sig[2] = op(set->sig[2]);                      \
 167             case 2: set->sig[1] = op(set->sig[1]);                      \
 168             case 1: set->sig[0] = op(set->sig[0]);                      \
 169                     break;                                              \
 170             default:                                                    \
 171                 _NSIG_WORDS_is_unsupported_size();                      \
 172         }                                                               \
 173 }
 174
 175 #define _sig_not(x)     (~(x))
 176 _SIG_SET_OP(signotset, _sig_not)
 177
 178 #undef _SIG_SET_OP
 179 #undef _sig_not
 180
 181 static inline void sigemptyset(sigset_t *set)
 182 {
 183         switch (_NSIG_WORDS) {
 184         default:
 185                 memset(set, 0, sizeof(sigset_t));
 186                 break;
 187         case 2: set->sig[1] = 0;
 188         case 1: set->sig[0] = 0;
 189                 break;
 190         }
 191 }
 192
 193 static inline void sigfillset(sigset_t *set)
 194 {
 195         switch (_NSIG_WORDS) {
 196         default:
 197                 memset(set, -1, sizeof(sigset_t));
 198                 break;
 199         case 2: set->sig[1] = -1;
 200         case 1: set->sig[0] = -1;
 201                 break;
 202         }
 203 }
 204
 205 /* Some extensions for manipulating the low 32 signals in particular.  */
 206
 207 static inline void sigaddsetmask(sigset_t *set, unsigned long mask)
 208 {
 209         set->sig[0] |= mask;
 210 }
 211
 212 static inline void sigdelsetmask(sigset_t *set, unsigned long mask)
 213 {
 214         set->sig[0] &= ~mask;
 215 }
 216
 217 static inline int sigtestsetmask(sigset_t *set, unsigned long mask)
 218 {
 219         return (set->sig[0] & mask) != 0;
 220 }
 221
 222 static inline void siginitset(sigset_t *set, unsigned long mask)
 223 {
 224         set->sig[0] = mask;
 225         switch (_NSIG_WORDS) {
 226         default:
 227                 memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
 228                 break;
 229         case 2: set->sig[1] = 0;
 230         case 1: ;
 231         }
 232 }
 233
 234 static inline void siginitsetinv(sigset_t *set, unsigned long mask)
 235 {
 236         set->sig[0] = ~mask;
 237         switch (_NSIG_WORDS) {
 238         default:
 239                 memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
 240                 break;
 241         case 2: set->sig[1] = -1;
 242         case 1: ;
 243         }
 244 }
 245
 246 #endif /* __HAVE_ARCH_SIG_SETOPS */
 247
 248 static inline void init_sigpending(struct sigpending *sig)
 249 {
 250         sigemptyset(&sig->signal);
 251         INIT_LIST_HEAD(&sig->list);
 252 }
 253
 254 extern void flush_sigqueue(struct sigpending *queue);
 255
 256 /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
 257 static inline int valid_signal(unsigned long sig)
 258 {
 259         return sig <= _NSIG ? 1 : 0;
 260 }
 261
 262 extern int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p);
 263 extern int __group_send_sig_info(int, struct siginfo *, struct task_struct *);
 264 extern long do_sigpending(void __user *, unsigned long);
 265 extern int sigprocmask(int, sigset_t *, sigset_t *);
 266
 267 struct pt_regs;
 268 extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
 269
 270 #endif /* __KERNEL__ */
 271
 272 #endif /* _LINUX_SIGNAL_H */