i386/linux-2.3.21/include/asm-i386/signal.h

   1 #ifndef _ASMi386_SIGNAL_H
   2 #define _ASMi386_SIGNAL_H
   3
   4 #include <linux/types.h>
   5
   6 /* Avoid too many header ordering problems.  */
   7 struct siginfo;
   8
   9 #ifdef __KERNEL__
  10 /* Most things should be clean enough to redefine this at will, if care
  11    is taken to make libc match.  */
  12
  13 #define _NSIG           64
  14 #define _NSIG_BPW       32
  15 #define _NSIG_WORDS     (_NSIG / _NSIG_BPW)
  16
  17 typedef unsigned long old_sigset_t;             /* at least 32 bits */
  18
  19 typedef struct {
  20         unsigned long sig[_NSIG_WORDS];
  21 } sigset_t;
  22
  23 #else
  24 /* Here we must cater to libcs that poke about in kernel headers.  */
  25
  26 #define NSIG            32
  27 typedef unsigned long sigset_t;
  28
  29 #endif /* __KERNEL__ */
  30
  31 #define SIGHUP           1
  32 #define SIGINT           2
  33 #define SIGQUIT          3
  34 #define SIGILL           4
  35 #define SIGTRAP          5
  36 #define SIGABRT          6
  37 #define SIGIOT           6
  38 #define SIGBUS           7
  39 #define SIGFPE           8
  40 #define SIGKILL          9
  41 #define SIGUSR1         10
  42 #define SIGSEGV         11
  43 #define SIGUSR2         12
  44 #define SIGPIPE         13
  45 #define SIGALRM         14
  46 #define SIGTERM         15
  47 #define SIGSTKFLT       16
  48 #define SIGCHLD         17
  49 #define SIGCONT         18
  50 #define SIGSTOP         19
  51 #define SIGTSTP         20
  52 #define SIGTTIN         21
  53 #define SIGTTOU         22
  54 #define SIGURG          23
  55 #define SIGXCPU         24
  56 #define SIGXFSZ         25
  57 #define SIGVTALRM       26
  58 #define SIGPROF         27
  59 #define SIGWINCH        28
  60 #define SIGIO           29
  61 #define SIGPOLL         SIGIO
  62 /*
  63 #define SIGLOST         29
  64 */
  65 #define SIGPWR          30
  66 #define SIGUNUSED       31
  67
  68 /* These should not be considered constants from userland.  */
  69 #define SIGRTMIN        32
  70 #define SIGRTMAX        (_NSIG-1)
  71
  72 /*
  73  * SA_FLAGS values:
  74  *
  75  * SA_ONSTACK indicates that a registered stack_t will be used.
  76  * SA_INTERRUPT is a no-op, but left due to historical reasons. Use the
  77  * SA_RESTART flag to get restarting signals (which were the default long ago)
  78  * SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
  79  * SA_RESETHAND clears the handler when the signal is delivered.
  80  * SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
  81  * SA_NODEFER prevents the current signal from being masked in the handler.
  82  *
  83  * SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
  84  * Unix names RESETHAND and NODEFER respectively.
  85  */
  86 #define SA_NOCLDSTOP    0x00000001
  87 #define SA_NOCLDWAIT    0x00000002 /* not supported yet */
  88 #define SA_SIGINFO      0x00000004
  89 #define SA_ONSTACK      0x08000000
  90 #define SA_RESTART      0x10000000
  91 #define SA_NODEFER      0x40000000
  92 #define SA_RESETHAND    0x80000000
  93
  94 #define SA_NOMASK       SA_NODEFER
  95 #define SA_ONESHOT      SA_RESETHAND
  96 #define SA_INTERRUPT    0x20000000 /* dummy -- ignored */
  97
  98 #define SA_RESTORER     0x04000000
  99
 100 /*
 101  * sigaltstack controls
 102  */
 103 #define SS_ONSTACK      1
 104 #define SS_DISABLE      2
 105
 106 #define MINSIGSTKSZ     2048
 107 #define SIGSTKSZ        8192
 108
 109 #ifdef __KERNEL__
 110
 111 /*
 112  * These values of sa_flags are used only by the kernel as part of the
 113  * irq handling routines.
 114  *
 115  * SA_INTERRUPT is also used by the irq handling routines.
 116  * SA_SHIRQ is for shared interrupt support on PCI and EISA.
 117  */
 118 #define SA_PROBE                SA_ONESHOT
 119 #define SA_SAMPLE_RANDOM        SA_RESTART
 120 #define SA_SHIRQ                0x04000000
 121 #endif
 122
 123 #define SIG_BLOCK          0    /* for blocking signals */
 124 #define SIG_UNBLOCK        1    /* for unblocking signals */
 125 #define SIG_SETMASK        2    /* for setting the signal mask */
 126
 127 /* Type of a signal handler.  */
 128 typedef void (*__sighandler_t)(int);
 129
 130 #define SIG_DFL ((__sighandler_t)0)     /* default signal handling */
 131 #define SIG_IGN ((__sighandler_t)1)     /* ignore signal */
 132 #define SIG_ERR ((__sighandler_t)-1)    /* error return from signal */
 133
 134 #ifdef __KERNEL__
 135 struct old_sigaction {
 136         __sighandler_t sa_handler;
 137         old_sigset_t sa_mask;
 138         unsigned long sa_flags;
 139         void (*sa_restorer)(void);
 140 };
 141
 142 struct sigaction {
 143         __sighandler_t sa_handler;
 144         unsigned long sa_flags;
 145         void (*sa_restorer)(void);
 146         sigset_t sa_mask;               /* mask last for extensibility */
 147 };
 148
 149 struct k_sigaction {
 150         struct sigaction sa;
 151 };
 152 #else
 153 /* Here we must cater to libcs that poke about in kernel headers.  */
 154
 155 struct sigaction {
 156         union {
 157           __sighandler_t _sa_handler;
 158           void (*_sa_sigaction)(int, struct siginfo *, void *);
 159         } _u;
 160         sigset_t sa_mask;
 161         unsigned long sa_flags;
 162         void (*sa_restorer)(void);
 163 };
 164
 165 #define sa_handler      _u._sa_handler
 166 #define sa_sigaction    _u._sa_sigaction
 167
 168 #endif /* __KERNEL__ */
 169
 170 typedef struct sigaltstack {
 171         void *ss_sp;
 172         int ss_flags;
 173         size_t ss_size;
 174 } stack_t;
 175
 176 #ifdef __KERNEL__
 177 #include <asm/sigcontext.h>
 178
 179 #define __HAVE_ARCH_SIG_BITOPS
 180
 181 extern __inline__ void sigaddset(sigset_t *set, int _sig)
 182 {
 183         __asm__("btsl %1,%0" : "=m"(*set) : "Ir"(_sig - 1) : "cc");
 184 }
 185
 186 extern __inline__ void sigdelset(sigset_t *set, int _sig)
 187 {
 188         __asm__("btrl %1,%0" : "=m"(*set) : "Ir"(_sig - 1) : "cc");
 189 }
 190
 191 extern __inline__ int __const_sigismember(sigset_t *set, int _sig)
 192 {
 193         unsigned long sig = _sig - 1;
 194         return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
 195 }
 196
 197 extern __inline__ int __gen_sigismember(sigset_t *set, int _sig)
 198 {
 199         int ret;
 200         __asm__("btl %2,%1\n\tsbbl %0,%0"
 201                 : "=r"(ret) : "m"(*set), "Ir"(_sig-1) : "cc");
 202         return ret;
 203 }
 204
 205 #define sigismember(set,sig)                    \
 206         (__builtin_constant_p(sig) ?            \
 207          __const_sigismember((set),(sig)) :     \
 208          __gen_sigismember((set),(sig)))
 209
 210 #define sigmask(sig)    (1UL << ((sig) - 1))
 211
 212 extern __inline__ int sigfindinword(unsigned long word)
 213 {
 214         __asm__("bsfl %1,%0" : "=r"(word) : "rm"(word) : "cc");
 215         return word;
 216 }
 217
 218 #endif /* __KERNEL__ */
 219
 220 #endif