signal.c

   1 #ifdef __x86_64__
   2
   3 #include <signal.h>
   4
   5 #define SIG_BLOCK       0
   6 #define SIG_UNBLOCK     1
   7 #define SIG_SETMASK     2
   8
   9 #define SA_NOCLDSTOP  1
  10 #define SA_NOCLDWAIT  2
  11 #define SA_SIGINFO    4
  12 #define SA_ONSTACK    0x08000000
  13 #define SA_RESTART    0x10000000
  14 #define SA_NODEFER    0x40000000
  15 #define SA_RESETHAND  0x80000000
  16 #define SA_RESTORER   0x04000000
  17
  18 struct sigset_t {
  19         unsigned long __bits[128 / sizeof(long)];
  20 };
  21 typedef struct sigset_t sigset_t;
  22
  23 struct sigaction {
  24         void (*sa_handler)(int);
  25         sigset_t sa_mask;
  26         int sa_flags;
  27         void (*sa_restorer)(void);
  28 };
  29
  30 int sigreturn(unsigned long n);
  31
  32 struct ksa {
  33         void *handler;
  34         unsigned long flags;
  35         int (*restorer)(unsigned long n);
  36         sigset_t mask;
  37 };
  38
  39 int __sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
  40 {
  41         struct ksa ksa, _ksa;
  42         if (sa) {
  43                 ksa.handler = sa->sa_handler;
  44                 ksa.flags = sa->sa_flags | SA_RESTORER;
  45                 ksa.restorer = sigreturn;
  46                 ksa.mask = sa->sa_mask;
  47         }
  48         if (sigaction(sig, sa ? (long) &ksa : 0, old ? (long) &_ksa : 0, 8))
  49                 return -1;
  50         if (old) {
  51                 old->sa_handler = _ksa.handler;
  52                 old->sa_flags = _ksa.flags;
  53                 old->sa_mask = _ksa.mask;
  54         }
  55         return 0;
  56 }
  57
  58 int sigaction(int sig, struct sigaction *sa, struct sigaction *old_sa);
  59
  60 sighandler_t signal(int sig, sighandler_t func)
  61 {
  62         struct sigaction sa = {.sa_handler = func, .sa_flags = SA_RESTART};
  63         if (__sigaction(sig, &sa, &sa) < 0)
  64                 return SIG_ERR;
  65         return sa.sa_handler;
  66 }
  67
  68 #endif