signals.c

这个是LINUX下的GDB调度工具的源码

/* Target signal translation functions for GDB.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   2000, 2001, 2002 Free Software Foundation, Inc.
   Contributed by Cygnus Support.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifdef GDBSERVER
#include "server.h"
#else
#include "defs.h"
#include "target.h"
#include "gdb_string.h"
#endif

#include <signal.h>

/* Always use __SIGRTMIN if it's available.  SIGRTMIN is the lowest
   _available_ realtime signal, not the lowest supported; glibc takes
   several for its own use.  */

#ifndef REALTIME_LO
# if defined(__SIGRTMIN)
#  define REALTIME_LO __SIGRTMIN
#  define REALTIME_HI __SIGRTMAX
# elif defined(SIGRTMIN)
#  define REALTIME_LO SIGRTMIN
#  define REALTIME_HI SIGRTMAX
# endif
#endif

/* This table must match in order and size the signals in enum target_signal
   in target.h.  */
/* *INDENT-OFF* */
static struct {
  char *name;
  char *string;
  } signals [] =
{
  {"0", "Signal 0"},
  {"SIGHUP", "Hangup"},
  {"SIGINT", "Interrupt"},
  {"SIGQUIT", "Quit"},
  {"SIGILL", "Illegal instruction"},
  {"SIGTRAP", "Trace/breakpoint trap"},
  {"SIGABRT", "Aborted"},
  {"SIGEMT", "Emulation trap"},
  {"SIGFPE", "Arithmetic exception"},
  {"SIGKILL", "Killed"},
  {"SIGBUS", "Bus error"},
  {"SIGSEGV", "Segmentation fault"},
  {"SIGSYS", "Bad system call"},
  {"SIGPIPE", "Broken pipe"},
  {"SIGALRM", "Alarm clock"},
  {"SIGTERM", "Terminated"},
  {"SIGURG", "Urgent I/O condition"},
  {"SIGSTOP", "Stopped (signal)"},
  {"SIGTSTP", "Stopped (user)"},
  {"SIGCONT", "Continued"},
  {"SIGCHLD", "Child status changed"},
  {"SIGTTIN", "Stopped (tty input)"},
  {"SIGTTOU", "Stopped (tty output)"},
  {"SIGIO", "I/O possible"},
  {"SIGXCPU", "CPU time limit exceeded"},
  {"SIGXFSZ", "File size limit exceeded"},
  {"SIGVTALRM", "Virtual timer expired"},
  {"SIGPROF", "Profiling timer expired"},
  {"SIGWINCH", "Window size changed"},
  {"SIGLOST", "Resource lost"},
  {"SIGUSR1", "User defined signal 1"},
  {"SIGUSR2", "User defined signal 2"},
  {"SIGPWR", "Power fail/restart"},
  {"SIGPOLL", "Pollable event occurred"},
  {"SIGWIND", "SIGWIND"},
  {"SIGPHONE", "SIGPHONE"},
  {"SIGWAITING", "Process's LWPs are blocked"},
  {"SIGLWP", "Signal LWP"},
  {"SIGDANGER", "Swap space dangerously low"},
  {"SIGGRANT", "Monitor mode granted"},
  {"SIGRETRACT", "Need to relinquish monitor mode"},
  {"SIGMSG", "Monitor mode data available"},
  {"SIGSOUND", "Sound completed"},
  {"SIGSAK", "Secure attention"},
  {"SIGPRIO", "SIGPRIO"},
  {"SIG33", "Real-time event 33"},
  {"SIG34", "Real-time event 34"},
  {"SIG35", "Real-time event 35"},
  {"SIG36", "Real-time event 36"},
  {"SIG37", "Real-time event 37"},
  {"SIG38", "Real-time event 38"},
  {"SIG39", "Real-time event 39"},
  {"SIG40", "Real-time event 40"},
  {"SIG41", "Real-time event 41"},
  {"SIG42", "Real-time event 42"},
  {"SIG43", "Real-time event 43"},
  {"SIG44", "Real-time event 44"},
  {"SIG45", "Real-time event 45"},
  {"SIG46", "Real-time event 46"},
  {"SIG47", "Real-time event 47"},
  {"SIG48", "Real-time event 48"},
  {"SIG49", "Real-time event 49"},
  {"SIG50", "Real-time event 50"},
  {"SIG51", "Real-time event 51"},
  {"SIG52", "Real-time event 52"},
  {"SIG53", "Real-time event 53"},
  {"SIG54", "Real-time event 54"},
  {"SIG55", "Real-time event 55"},
  {"SIG56", "Real-time event 56"},
  {"SIG57", "Real-time event 57"},
  {"SIG58", "Real-time event 58"},
  {"SIG59", "Real-time event 59"},
  {"SIG60", "Real-time event 60"},
  {"SIG61", "Real-time event 61"},
  {"SIG62", "Real-time event 62"},
  {"SIG63", "Real-time event 63"},
  {"SIGCANCEL", "LWP internal signal"},
  {"SIG32", "Real-time event 32"},
  {"SIG64", "Real-time event 64"},
  {"SIG65", "Real-time event 65"},
  {"SIG66", "Real-time event 66"},
  {"SIG67", "Real-time event 67"},
  {"SIG68", "Real-time event 68"},
  {"SIG69", "Real-time event 69"},
  {"SIG70", "Real-time event 70"},
  {"SIG71", "Real-time event 71"},
  {"SIG72", "Real-time event 72"},
  {"SIG73", "Real-time event 73"},
  {"SIG74", "Real-time event 74"},
  {"SIG75", "Real-time event 75"},
  {"SIG76", "Real-time event 76"},
  {"SIG77", "Real-time event 77"},
  {"SIG78", "Real-time event 78"},
  {"SIG79", "Real-time event 79"},
  {"SIG80", "Real-time event 80"},
  {"SIG81", "Real-time event 81"},
  {"SIG82", "Real-time event 82"},
  {"SIG83", "Real-time event 83"},
  {"SIG84", "Real-time event 84"},
  {"SIG85", "Real-time event 85"},
  {"SIG86", "Real-time event 86"},
  {"SIG87", "Real-time event 87"},
  {"SIG88", "Real-time event 88"},
  {"SIG89", "Real-time event 89"},
  {"SIG90", "Real-time event 90"},
  {"SIG91", "Real-time event 91"},
  {"SIG92", "Real-time event 92"},
  {"SIG93", "Real-time event 93"},
  {"SIG94", "Real-time event 94"},
  {"SIG95", "Real-time event 95"},
  {"SIG96", "Real-time event 96"},
  {"SIG97", "Real-time event 97"},
  {"SIG98", "Real-time event 98"},
  {"SIG99", "Real-time event 99"},
  {"SIG100", "Real-time event 100"},
  {"SIG101", "Real-time event 101"},
  {"SIG102", "Real-time event 102"},
  {"SIG103", "Real-time event 103"},
  {"SIG104", "Real-time event 104"},
  {"SIG105", "Real-time event 105"},
  {"SIG106", "Real-time event 106"},
  {"SIG107", "Real-time event 107"},
  {"SIG108", "Real-time event 108"},
  {"SIG109", "Real-time event 109"},
  {"SIG110", "Real-time event 110"},
  {"SIG111", "Real-time event 111"},
  {"SIG112", "Real-time event 112"},
  {"SIG113", "Real-time event 113"},
  {"SIG114", "Real-time event 114"},
  {"SIG115", "Real-time event 115"},
  {"SIG116", "Real-time event 116"},
  {"SIG117", "Real-time event 117"},
  {"SIG118", "Real-time event 118"},
  {"SIG119", "Real-time event 119"},
  {"SIG120", "Real-time event 120"},
  {"SIG121", "Real-time event 121"},
  {"SIG122", "Real-time event 122"},
  {"SIG123", "Real-time event 123"},
  {"SIG124", "Real-time event 124"},
  {"SIG125", "Real-time event 125"},
  {"SIG126", "Real-time event 126"},
  {"SIG127", "Real-time event 127"},

  {"SIGINFO", "Information request"},

  {NULL, "Unknown signal"},
  {NULL, "Internal error: printing TARGET_SIGNAL_DEFAULT"},

  /* Mach exceptions */
  {"EXC_BAD_ACCESS", "Could not access memory"},
  {"EXC_BAD_INSTRUCTION", "Illegal instruction/operand"},
  {"EXC_ARITHMETIC", "Arithmetic exception"},
  {"EXC_EMULATION", "Emulation instruction"},
  {"EXC_SOFTWARE", "Software generated exception"},
  {"EXC_BREAKPOINT", "Breakpoint"},

  /* Last entry, used to check whether the table is the right size.  */
  {NULL, "TARGET_SIGNAL_MAGIC"}
};
/* *INDENT-ON* */



/* Return the string for a signal.  */
char *
target_signal_to_string (enum target_signal sig)
{
  if ((sig >= TARGET_SIGNAL_FIRST) && (sig <= TARGET_SIGNAL_LAST))
    return signals[sig].string;
  else
    return signals[TARGET_SIGNAL_UNKNOWN].string;
}

/* Return the name for a signal.  */
char *
target_signal_to_name (enum target_signal sig)
{
  if ((sig >= TARGET_SIGNAL_FIRST) && (sig <= TARGET_SIGNAL_LAST)
      && signals[sig].name != NULL)
    return signals[sig].name;
  else
    /* I think the code which prints this will always print it along
       with the string, so no need to be verbose (very old comment).  */
    return "?";
}

/* Given a name, return its signal.  */
enum target_signal
target_signal_from_name (char *name)
{
  enum target_signal sig;

  /* It's possible we also should allow "SIGCLD" as well as "SIGCHLD"
     for TARGET_SIGNAL_SIGCHLD.  SIGIOT, on the other hand, is more
     questionable; seems like by now people should call it SIGABRT
     instead.  */

  /* This ugly cast brought to you by the native VAX compiler.  */
  for (sig = TARGET_SIGNAL_HUP;
       sig < TARGET_SIGNAL_LAST;
       sig = (enum target_signal) ((int) sig + 1))
    if (signals[sig].name != NULL
	&& strcmp (name, signals[sig].name) == 0)
      return sig;
  return TARGET_SIGNAL_UNKNOWN;
}

/* The following functions are to help certain targets deal
   with the signal/waitstatus stuff.  They could just as well be in
   a file called native-utils.c or unixwaitstatus-utils.c or whatever.  */

/* Convert host signal to our signals.  */
enum target_signal
target_signal_from_host (int hostsig)
{
  /* A switch statement would make sense but would require special kludges
     to deal with the cases where more than one signal has the same number.  */

  if (hostsig == 0)
    return TARGET_SIGNAL_0;

#if defined (SIGHUP)
  if (hostsig == SIGHUP)
    return TARGET_SIGNAL_HUP;
#endif
#if defined (SIGINT)
  if (hostsig == SIGINT)
    return TARGET_SIGNAL_INT;
#endif
#if defined (SIGQUIT)
  if (hostsig == SIGQUIT)
    return TARGET_SIGNAL_QUIT;
#endif
#if defined (SIGILL)
  if (hostsig == SIGILL)
    return TARGET_SIGNAL_ILL;
#endif
#if defined (SIGTRAP)
  if (hostsig == SIGTRAP)
    return TARGET_SIGNAL_TRAP;
#endif
#if defined (SIGABRT)
  if (hostsig == SIGABRT)
    return TARGET_SIGNAL_ABRT;
#endif
#if defined (SIGEMT)
  if (hostsig == SIGEMT)
    return TARGET_SIGNAL_EMT;
#endif
#if defined (SIGFPE)
  if (hostsig == SIGFPE)
    return TARGET_SIGNAL_FPE;
#endif
#if defined (SIGKILL)
  if (hostsig == SIGKILL)
    return TARGET_SIGNAL_KILL;
#endif
#if defined (SIGBUS)
  if (hostsig == SIGBUS)
    return TARGET_SIGNAL_BUS;
#endif
#if defined (SIGSEGV)
  if (hostsig == SIGSEGV)
    return TARGET_SIGNAL_SEGV;
#endif
#if defined (SIGSYS)
  if (hostsig == SIGSYS)
    return TARGET_SIGNAL_SYS;
#endif
#if defined (SIGPIPE)
  if (hostsig == SIGPIPE)
    return TARGET_SIGNAL_PIPE;
#endif
#if defined (SIGALRM)
  if (hostsig == SIGALRM)
    return TARGET_SIGNAL_ALRM;
#endif
#if defined (SIGTERM)
  if (hostsig == SIGTERM)
    return TARGET_SIGNAL_TERM;
#endif
#if defined (SIGUSR1)
  if (hostsig == SIGUSR1)
    return TARGET_SIGNAL_USR1;
#endif
#if defined (SIGUSR2)
  if (hostsig == SIGUSR2)
    return TARGET_SIGNAL_USR2;
#endif
#if defined (SIGCLD)
  if (hostsig == SIGCLD)
    return TARGET_SIGNAL_CHLD;
#endif
#if defined (SIGCHLD)
  if (hostsig == SIGCHLD)
    return TARGET_SIGNAL_CHLD;
#endif
#if defined (SIGPWR)
  if (hostsig == SIGPWR)
    return TARGET_SIGNAL_PWR;
#endif
#if defined (SIGWINCH)
  if (hostsig == SIGWINCH)
    return TARGET_SIGNAL_WINCH;
#endif
#if defined (SIGURG)
  if (hostsig == SIGURG)
    return TARGET_SIGNAL_URG;
#endif
#if defined (SIGIO)
  if (hostsig == SIGIO)
    return TARGET_SIGNAL_IO;
#endif
#if defined (SIGPOLL)
  if (hostsig == SIGPOLL)
    return TARGET_SIGNAL_POLL;
#endif
#if defined (SIGSTOP)
  if (hostsig == SIGSTOP)
    return TARGET_SIGNAL_STOP;
#endif
#if defined (SIGTSTP)
  if (hostsig == SIGTSTP)
    return TARGET_SIGNAL_TSTP;
#endif
#if defined (SIGCONT)
  if (hostsig == SIGCONT)
    return TARGET_SIGNAL_CONT;
#endif
#if defined (SIGTTIN)
  if (hostsig == SIGTTIN)
    return TARGET_SIGNAL_TTIN;
#endif
#if defined (SIGTTOU)
  if (hostsig == SIGTTOU)
    return TARGET_SIGNAL_TTOU;
#endif
#if defined (SIGVTALRM)
  if (hostsig == SIGVTALRM)
    return TARGET_SIGNAL_VTALRM;
#endif
#if defined (SIGPROF)
  if (hostsig == SIGPROF)
    return TARGET_SIGNAL_PROF;
#endif
#if defined (SIGXCPU)
  if (hostsig == SIGXCPU)
    return TARGET_SIGNAL_XCPU;
#endif
#if defined (SIGXFSZ)
  if (hostsig == SIGXFSZ)
    return TARGET_SIGNAL_XFSZ;
#endif
#if defined (SIGWIND)
  if (hostsig == SIGWIND)
    return TARGET_SIGNAL_WIND;
#endif
#if defined (SIGPHONE)
  if (hostsig == SIGPHONE)
    return TARGET_SIGNAL_PHONE;
#endif
#if defined (SIGLOST)