oact->sa_handler = k_osigact.k_sa_handler; oact->sa_mask.__val[0] = k_osigact.sa_mask; oact->sa_flags = k_osigact.sa_flags; oact->sa_restorer = NULL;
if (oact) { oact->sa_handler = k_osigact.k_sa_handler; oact->sa_mask.__val[0] = k_osigact.sa_mask; oact->sa_flags = k_osigact.sa_flags; oact->sa_restorer = NULL; }
__sigaction (int sig, __const struct sigaction *act, struct sigaction *oact){  struct old_kernel_sigaction k_sigact, k_osigact;  int ret;#ifdef __NR_rt_sigaction  /* First try the RT signals.  */  if (!__libc_missing_rt_sigs)    {      struct kernel_sigaction kact, koact;      unsigned long stub = 0;      int saved_errno = errno;      if (act)	{	  kact.k_sa_handler = act->sa_handler;	  memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));	  if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO) != 0)	    stub = (unsigned long) &__rt_sigreturn_stub;	  else	    stub = (unsigned long) &__sigreturn_stub;	  stub -= 8;	  kact.sa_restorer = NULL;	}      /* XXX The size argument hopefully will have to be changed to the	 real size of the user-level sigset_t.  */      ret = __syscall_rt_sigaction (sig, act ? &kact : 0,				    oact ? &koact : 0,				    stub, _NSIG / 8);      if (ret >= 0 || errno != ENOSYS)	{	  if (oact && ret >= 0)	    {	      oact->sa_handler = koact.k_sa_handler;	      memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));	      oact->sa_flags = koact.sa_flags;	      oact->sa_restorer = koact.sa_restorer;	    }	  return ret;	}      __set_errno (saved_errno);      __libc_missing_rt_sigs = 1;    }#endif  /* Magic to tell the kernel we are using "new-style" signals, in that     the signal table is not kept in userspace.  Not the same as the     really-new-style rt signals.  */  sig = -sig;  if (act)    {      k_sigact.k_sa_handler = act->sa_handler;      k_sigact.sa_mask = act->sa_mask.__val[0];      k_sigact.sa_flags = act->sa_flags;      k_sigact.sa_restorer = NULL;    }  {    register int r_syscallnr __asm__("%g1") = __NR_sigaction;    register int r_sig __asm__("%o0") = sig;    register struct old_kernel_sigaction *r_act __asm__("%o1");    register struct old_kernel_sigaction *r_oact __asm__("%o2");    r_act = act ? &k_sigact : NULL;    r_oact = oact ? &k_osigact : NULL;    __asm__ __volatile__("t 0x10\n\t"			 "bcc 1f\n\t"			 " nop\n\t"			 "sub %%g0,%%o0,%%o0\n"			 "1:"			 : "=r"(r_sig)			 : "r"(r_syscallnr), "r"(r_act), "r"(r_oact),			   "0"(r_sig));    ret = r_sig;  }  if (oact && ret >= 0)    {      oact->sa_handler = k_osigact.k_sa_handler;      oact->sa_mask.__val[0] = k_osigact.sa_mask;      oact->sa_flags = k_osigact.sa_flags;      oact->sa_restorer = NULL;      return ret;    }  __set_errno (-ret);  return -1;}