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