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