signals.c

这个是LINUX下的GDB调度工具的源码

  if (hostsig == SIGLOST)
    return TARGET_SIGNAL_LOST;
#endif
#if defined (SIGWAITING)
  if (hostsig == SIGWAITING)
    return TARGET_SIGNAL_WAITING;
#endif
#if defined (SIGCANCEL)
  if (hostsig == SIGCANCEL)
    return TARGET_SIGNAL_CANCEL;
#endif
#if defined (SIGLWP)
  if (hostsig == SIGLWP)
    return TARGET_SIGNAL_LWP;
#endif
#if defined (SIGDANGER)
  if (hostsig == SIGDANGER)
    return TARGET_SIGNAL_DANGER;
#endif
#if defined (SIGGRANT)
  if (hostsig == SIGGRANT)
    return TARGET_SIGNAL_GRANT;
#endif
#if defined (SIGRETRACT)
  if (hostsig == SIGRETRACT)
    return TARGET_SIGNAL_RETRACT;
#endif
#if defined (SIGMSG)
  if (hostsig == SIGMSG)
    return TARGET_SIGNAL_MSG;
#endif
#if defined (SIGSOUND)
  if (hostsig == SIGSOUND)
    return TARGET_SIGNAL_SOUND;
#endif
#if defined (SIGSAK)
  if (hostsig == SIGSAK)
    return TARGET_SIGNAL_SAK;
#endif
#if defined (SIGPRIO)
  if (hostsig == SIGPRIO)
    return TARGET_SIGNAL_PRIO;
#endif

  /* Mach exceptions.  Assumes that the values for EXC_ are positive! */
#if defined (EXC_BAD_ACCESS) && defined (_NSIG)
  if (hostsig == _NSIG + EXC_BAD_ACCESS)
    return TARGET_EXC_BAD_ACCESS;
#endif
#if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
  if (hostsig == _NSIG + EXC_BAD_INSTRUCTION)
    return TARGET_EXC_BAD_INSTRUCTION;
#endif
#if defined (EXC_ARITHMETIC) && defined (_NSIG)
  if (hostsig == _NSIG + EXC_ARITHMETIC)
    return TARGET_EXC_ARITHMETIC;
#endif
#if defined (EXC_EMULATION) && defined (_NSIG)
  if (hostsig == _NSIG + EXC_EMULATION)
    return TARGET_EXC_EMULATION;
#endif
#if defined (EXC_SOFTWARE) && defined (_NSIG)
  if (hostsig == _NSIG + EXC_SOFTWARE)
    return TARGET_EXC_SOFTWARE;
#endif
#if defined (EXC_BREAKPOINT) && defined (_NSIG)
  if (hostsig == _NSIG + EXC_BREAKPOINT)
    return TARGET_EXC_BREAKPOINT;
#endif

#if defined (SIGINFO)
  if (hostsig == SIGINFO)
    return TARGET_SIGNAL_INFO;
#endif

#if defined (REALTIME_LO)
  if (hostsig >= REALTIME_LO && hostsig < REALTIME_HI)
    {
      /* This block of TARGET_SIGNAL_REALTIME value is in order.  */
      if (33 <= hostsig && hostsig <= 63)
	return (enum target_signal)
	  (hostsig - 33 + (int) TARGET_SIGNAL_REALTIME_33);
      else if (hostsig == 32)
	return TARGET_SIGNAL_REALTIME_32;
      else if (64 <= hostsig && hostsig <= 127)
	return (enum target_signal)
	  (hostsig - 64 + (int) TARGET_SIGNAL_REALTIME_64);
      else
	error ("GDB bug: target.c (target_signal_from_host): unrecognized real-time signal");
    }
#endif

  return TARGET_SIGNAL_UNKNOWN;
}

/* Convert a OURSIG (an enum target_signal) to the form used by the
   target operating system (refered to as the ``host'') or zero if the
   equivalent host signal is not available.  Set/clear OURSIG_OK
   accordingly. */

static int
do_target_signal_to_host (enum target_signal oursig,
			  int *oursig_ok)
{
  int retsig;

  *oursig_ok = 1;
  switch (oursig)
    {
    case TARGET_SIGNAL_0:
      return 0;

#if defined (SIGHUP)
    case TARGET_SIGNAL_HUP:
      return SIGHUP;
#endif
#if defined (SIGINT)
    case TARGET_SIGNAL_INT:
      return SIGINT;
#endif
#if defined (SIGQUIT)
    case TARGET_SIGNAL_QUIT:
      return SIGQUIT;
#endif
#if defined (SIGILL)
    case TARGET_SIGNAL_ILL:
      return SIGILL;
#endif
#if defined (SIGTRAP)
    case TARGET_SIGNAL_TRAP:
      return SIGTRAP;
#endif
#if defined (SIGABRT)
    case TARGET_SIGNAL_ABRT:
      return SIGABRT;
#endif
#if defined (SIGEMT)
    case TARGET_SIGNAL_EMT:
      return SIGEMT;
#endif
#if defined (SIGFPE)
    case TARGET_SIGNAL_FPE:
      return SIGFPE;
#endif
#if defined (SIGKILL)
    case TARGET_SIGNAL_KILL:
      return SIGKILL;
#endif
#if defined (SIGBUS)
    case TARGET_SIGNAL_BUS:
      return SIGBUS;
#endif
#if defined (SIGSEGV)
    case TARGET_SIGNAL_SEGV:
      return SIGSEGV;
#endif
#if defined (SIGSYS)
    case TARGET_SIGNAL_SYS:
      return SIGSYS;
#endif
#if defined (SIGPIPE)
    case TARGET_SIGNAL_PIPE:
      return SIGPIPE;
#endif
#if defined (SIGALRM)
    case TARGET_SIGNAL_ALRM:
      return SIGALRM;
#endif
#if defined (SIGTERM)
    case TARGET_SIGNAL_TERM:
      return SIGTERM;
#endif
#if defined (SIGUSR1)
    case TARGET_SIGNAL_USR1:
      return SIGUSR1;
#endif
#if defined (SIGUSR2)
    case TARGET_SIGNAL_USR2:
      return SIGUSR2;
#endif
#if defined (SIGCHLD) || defined (SIGCLD)
    case TARGET_SIGNAL_CHLD:
#if defined (SIGCHLD)
      return SIGCHLD;
#else
      return SIGCLD;
#endif
#endif /* SIGCLD or SIGCHLD */
#if defined (SIGPWR)
    case TARGET_SIGNAL_PWR:
      return SIGPWR;
#endif
#if defined (SIGWINCH)
    case TARGET_SIGNAL_WINCH:
      return SIGWINCH;
#endif
#if defined (SIGURG)
    case TARGET_SIGNAL_URG:
      return SIGURG;
#endif
#if defined (SIGIO)
    case TARGET_SIGNAL_IO:
      return SIGIO;
#endif
#if defined (SIGPOLL)
    case TARGET_SIGNAL_POLL:
      return SIGPOLL;
#endif
#if defined (SIGSTOP)
    case TARGET_SIGNAL_STOP:
      return SIGSTOP;
#endif
#if defined (SIGTSTP)
    case TARGET_SIGNAL_TSTP:
      return SIGTSTP;
#endif
#if defined (SIGCONT)
    case TARGET_SIGNAL_CONT:
      return SIGCONT;
#endif
#if defined (SIGTTIN)
    case TARGET_SIGNAL_TTIN:
      return SIGTTIN;
#endif
#if defined (SIGTTOU)
    case TARGET_SIGNAL_TTOU:
      return SIGTTOU;
#endif
#if defined (SIGVTALRM)
    case TARGET_SIGNAL_VTALRM:
      return SIGVTALRM;
#endif
#if defined (SIGPROF)
    case TARGET_SIGNAL_PROF:
      return SIGPROF;
#endif
#if defined (SIGXCPU)
    case TARGET_SIGNAL_XCPU:
      return SIGXCPU;
#endif
#if defined (SIGXFSZ)
    case TARGET_SIGNAL_XFSZ:
      return SIGXFSZ;
#endif
#if defined (SIGWIND)
    case TARGET_SIGNAL_WIND:
      return SIGWIND;
#endif
#if defined (SIGPHONE)
    case TARGET_SIGNAL_PHONE:
      return SIGPHONE;
#endif
#if defined (SIGLOST)
    case TARGET_SIGNAL_LOST:
      return SIGLOST;
#endif
#if defined (SIGWAITING)
    case TARGET_SIGNAL_WAITING:
      return SIGWAITING;
#endif
#if defined (SIGCANCEL)
    case TARGET_SIGNAL_CANCEL:
      return SIGCANCEL;
#endif
#if defined (SIGLWP)
    case TARGET_SIGNAL_LWP:
      return SIGLWP;
#endif
#if defined (SIGDANGER)
    case TARGET_SIGNAL_DANGER:
      return SIGDANGER;
#endif
#if defined (SIGGRANT)
    case TARGET_SIGNAL_GRANT:
      return SIGGRANT;
#endif
#if defined (SIGRETRACT)
    case TARGET_SIGNAL_RETRACT:
      return SIGRETRACT;
#endif
#if defined (SIGMSG)
    case TARGET_SIGNAL_MSG:
      return SIGMSG;
#endif
#if defined (SIGSOUND)
    case TARGET_SIGNAL_SOUND:
      return SIGSOUND;
#endif
#if defined (SIGSAK)
    case TARGET_SIGNAL_SAK:
      return SIGSAK;
#endif
#if defined (SIGPRIO)
    case TARGET_SIGNAL_PRIO:
      return SIGPRIO;
#endif

      /* Mach exceptions.  Assumes that the values for EXC_ are positive! */
#if defined (EXC_BAD_ACCESS) && defined (_NSIG)
    case TARGET_EXC_BAD_ACCESS:
      return _NSIG + EXC_BAD_ACCESS;
#endif
#if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
    case TARGET_EXC_BAD_INSTRUCTION:
      return _NSIG + EXC_BAD_INSTRUCTION;
#endif
#if defined (EXC_ARITHMETIC) && defined (_NSIG)
    case TARGET_EXC_ARITHMETIC:
      return _NSIG + EXC_ARITHMETIC;
#endif
#if defined (EXC_EMULATION) && defined (_NSIG)
    case TARGET_EXC_EMULATION:
      return _NSIG + EXC_EMULATION;
#endif
#if defined (EXC_SOFTWARE) && defined (_NSIG)
    case TARGET_EXC_SOFTWARE:
      return _NSIG + EXC_SOFTWARE;
#endif
#if defined (EXC_BREAKPOINT) && defined (_NSIG)
    case TARGET_EXC_BREAKPOINT:
      return _NSIG + EXC_BREAKPOINT;
#endif

#if defined (SIGINFO)
    case TARGET_SIGNAL_INFO:
      return SIGINFO;
#endif

    default:
#if defined (REALTIME_LO)
      retsig = 0;

      if (oursig >= TARGET_SIGNAL_REALTIME_33
	  && oursig <= TARGET_SIGNAL_REALTIME_63)
	{
	  /* This block of signals is continuous, and
             TARGET_SIGNAL_REALTIME_33 is 33 by definition.  */
	  retsig = (int) oursig - (int) TARGET_SIGNAL_REALTIME_33 + 33;
	}
      else if (oursig == TARGET_SIGNAL_REALTIME_32)
	{
	  /* TARGET_SIGNAL_REALTIME_32 isn't contiguous with
             TARGET_SIGNAL_REALTIME_33.  It is 32 by definition.  */
	  retsig = 32;
	}
      else if (oursig >= TARGET_SIGNAL_REALTIME_64
	  && oursig <= TARGET_SIGNAL_REALTIME_127)
	{
	  /* This block of signals is continuous, and
             TARGET_SIGNAL_REALTIME_64 is 64 by definition.  */
	  retsig = (int) oursig - (int) TARGET_SIGNAL_REALTIME_64 + 64;
	}

      if (retsig >= REALTIME_LO && retsig < REALTIME_HI)
	return retsig;
#endif

      *oursig_ok = 0;
      return 0;
    }
}

int
target_signal_to_host_p (enum target_signal oursig)
{
  int oursig_ok;
  do_target_signal_to_host (oursig, &oursig_ok);
  return oursig_ok;
}

int
target_signal_to_host (enum target_signal oursig)
{
  int oursig_ok;
  int targ_signo = do_target_signal_to_host (oursig, &oursig_ok);
  if (!oursig_ok)
    {
      /* The user might be trying to do "signal SIGSAK" where this system
         doesn't have SIGSAK.  */
      warning ("Signal %s does not exist on this system.\n",
	       target_signal_to_name (oursig));
      return 0;
    }
  else
    return targ_signo;
}

/* In some circumstances we allow a command to specify a numeric
   signal.  The idea is to keep these circumstances limited so that
   users (and scripts) develop portable habits.  For comparison,
   POSIX.2 `kill' requires that 1,2,3,6,9,14, and 15 work (and using a
   numeric signal at all is obsolescent.  We are slightly more
   lenient and allow 1-15 which should match host signal numbers on
   most systems.  Use of symbolic signal names is strongly encouraged.  */

enum target_signal
target_signal_from_command (int num)
{
  if (num >= 1 && num <= 15)
    return (enum target_signal) num;
  error ("Only signals 1-15 are valid as numeric signals.\n\
Use \"info signals\" for a list of symbolic signals.");
}

#ifndef GDBSERVER
extern initialize_file_ftype _initialize_signals; /* -Wmissing-prototype */

void
_initialize_signals (void)
{
  if (strcmp (signals[TARGET_SIGNAL_LAST].string, "TARGET_SIGNAL_MAGIC") != 0)
    internal_error (__FILE__, __LINE__, "failed internal consistency check");
}
#endif