source/Target/UnixSignals.cpp

//===-- UnixSignals.cpp -----------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "lldb/Target/UnixSignals.h"

// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes

using namespace lldb_private;

UnixSignals::Signal::Signal (const char *name, bool default_suppress, bool default_stop, bool default_notify) :
    m_name (name),
    m_conditions ()
{
    m_conditions[Signal::eCondSuppress] = default_suppress;
    m_conditions[Signal::eCondStop]     = default_stop;
    m_conditions[Signal::eCondNotify]   = default_notify;
}

//----------------------------------------------------------------------
// UnixSignals constructor
//----------------------------------------------------------------------
UnixSignals::UnixSignals ()
{
    Reset ();
}

//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
UnixSignals::~UnixSignals ()
{
}

void
UnixSignals::Reset ()
{
    // This builds one standard set of Unix Signals.  If yours aren't quite in this
    // order, you can either subclass this class, and use Add & Remove to change them
    // or you can subclass and build them afresh in your constructor;
    m_signals.clear();

    AddSignal(1, "SIGHUP",     false, true,  true );    // 1    hangup
    AddSignal(2, "SIGINT",     true,  true,  true );    // 2    interrupt
    AddSignal(3, "SIGQUIT",    false, true,  true );    // 3    quit
    AddSignal(4, "SIGILL",     false, true,  true );    // 4    illegal instruction (not reset when caught)
    AddSignal(5, "SIGTRAP",    true,  true,  true );    // 5    trace trap (not reset when caught)
    AddSignal(6, "SIGABRT",    false, true,  true );    // 6    abort()
    AddSignal(7, "SIGEMT",     false, true,  true );    // 7    pollable event ([XSR] generated, not supported)
    AddSignal(8, "SIGFPE",     false, true,  true );    // 8    floating point exception
    AddSignal(9, "SIGKILL",    false, true,  true );    // 9    kill (cannot be caught or ignored)
    AddSignal(10, "SIGBUS",    false, true,  true );    // 10    bus error
    AddSignal(11, "SIGSEGV",   false, true,  true );    // 11    segmentation violation
    AddSignal(12, "SIGSYS",    false, true,  true );    // 12    bad argument to system call
    AddSignal(13, "SIGPIPE",   false, true,  true );    // 13    write on a pipe with no one to read it
    AddSignal(14, "SIGALRM",   false, false, true );    // 14    alarm clock
    AddSignal(15, "SIGTERM",   false, true,  true );    // 15    software termination signal from kill
    AddSignal(16, "SIGURG",    false, false, false);    // 16    urgent condition on IO channel
    AddSignal(17, "SIGSTOP",   false, true,  true );    // 17    sendable stop signal not from tty
    AddSignal(18, "SIGTSTP",   false, true,  true );    // 18    stop signal from tty
    AddSignal(19, "SIGCONT",   false, true,  true );    // 19    continue a stopped process
    AddSignal(20, "SIGCHLD",   false, false, true );    // 20    to parent on child stop or exit
    AddSignal(21, "SIGTTIN",   false, true,  true );    // 21    to readers pgrp upon background tty read
    AddSignal(22, "SIGTTOU",   false, true,  true );    // 22    like TTIN for output if (tp->t_local&LTOSTOP)
    AddSignal(23, "SIGIO",     false, false, false);    // 23    input/output possible signal
    AddSignal(24, "SIGXCPU",   false, true,  true );    // 24    exceeded CPU time limit
    AddSignal(25, "SIGXFSZ",   false, true,  true );    // 25    exceeded file size limit
    AddSignal(26, "SIGVTALRM", false, false, false);    // 26    virtual time alarm
    AddSignal(27, "SIGPROF",   false, false, false);    // 27    profiling time alarm
    AddSignal(28, "SIGWINCH",  false, false, false);    // 28    window size changes
    AddSignal(29, "SIGINFO",   false, true,  true );    // 29    information request
    AddSignal(30, "SIGUSR1",   false, true,  true );    // 30    user defined signal 1
    AddSignal(31, "SIGUSR2",   false, true,  true );    // 31    user defined signal 2
}
void
UnixSignals::AddSignal (int signo, const char *name, bool default_suppress, bool default_stop, bool default_notify)
{
    collection::iterator iter = m_signals.find (signo);
    struct Signal new_signal (name, default_suppress, default_stop, default_notify);

    if (iter != m_signals.end())
        m_signals.erase (iter);

    m_signals.insert (iter, collection::value_type (signo, new_signal));
}

void
UnixSignals::RemoveSignal (int signo)
{
    collection::iterator pos = m_signals.find (signo);
    if (pos != m_signals.end())
        m_signals.erase (pos);
}

UnixSignals::Signal *
UnixSignals::GetSignalByName (const char *name, int32_t &signo)
{
    ConstString const_name (name);

    collection::iterator pos, end = m_signals.end ();
    for (pos = m_signals.begin (); pos != end; pos++)
    {
        if (const_name == (*pos).second.m_name)
        {
            signo = (*pos).first;
            return &((*pos).second);
        }
    }
    return NULL;
}


const UnixSignals::Signal *
UnixSignals::GetSignalByName (const char *name, int32_t &signo) const
{
    ConstString const_name (name);

    collection::const_iterator pos, end = m_signals.end ();
    for (pos = m_signals.begin (); pos != end; pos++)
    {
        if (const_name == (*pos).second.m_name)
        {
            signo = (*pos).first;
            return &((*pos).second);
        }
    }
    return NULL;
}

const char *
UnixSignals::GetSignalAsCString (int signo) const
{
    collection::const_iterator pos = m_signals.find (signo);
    if (pos == m_signals.end())
        return NULL;
    else
        return (*pos).second.m_name.GetCString ();
}


bool
UnixSignals::SignalIsValid (int32_t signo) const
{
    return m_signals.find (signo) != m_signals.end();
}


int32_t
UnixSignals::GetSignalNumberFromName (const char *name) const
{
    int32_t signo;
    const Signal *signal = GetSignalByName (name, signo);
    if (signal == NULL)
        return LLDB_INVALID_SIGNAL_NUMBER;
    else
        return signo;
}

int32_t
UnixSignals::GetFirstSignalNumber () const
{
    if (m_signals.empty())
        return LLDB_INVALID_SIGNAL_NUMBER;

    return (*m_signals.begin ()).first;
}

int32_t
UnixSignals::GetNextSignalNumber (int32_t current_signal) const
{
    collection::const_iterator pos = m_signals.find (current_signal);
    collection::const_iterator end = m_signals.end();
    if (pos == end)
        return LLDB_INVALID_SIGNAL_NUMBER;
    else
    {
        pos++;
        if (pos == end)
            return LLDB_INVALID_SIGNAL_NUMBER;
        else
            return (*pos).first;
    }
}

const char *
UnixSignals::GetSignalInfo
(
    int32_t signo,
    bool &should_suppress,
    bool &should_stop,
    bool &should_notify
) const
{
    collection::const_iterator pos = m_signals.find (signo);
    if (pos == m_signals.end())
        return NULL;
    else
    {
        const Signal &signal = (*pos).second;
        should_suppress = signal.m_conditions[Signal::eCondSuppress];
        should_stop     = signal.m_conditions[Signal::eCondStop];
        should_notify   = signal.m_conditions[Signal::eCondNotify];
        return signal.m_name.AsCString("");
    }
}

bool
UnixSignals::GetCondition
(
    int32_t signo,
    UnixSignals::Signal::Condition cond_pos
) const
{
    collection::const_iterator pos = m_signals.find (signo);
    if (pos == m_signals.end())
        return false;
    else
        return (*pos).second.m_conditions[cond_pos];
}

bool
UnixSignals::SetCondition (int32_t signo, UnixSignals::Signal::Condition cond_pos, bool value)
{
    collection::iterator pos = m_signals.find (signo);
    if (pos == m_signals.end())
        return false;
    else
    {
        bool ret_value = (*pos).second.m_conditions[cond_pos];
        (*pos).second.m_conditions[cond_pos] = value;
        return ret_value;
    }
}

bool
UnixSignals::SetCondition (const char *signal_name, UnixSignals::Signal::Condition cond_pos, bool value)
{
    int32_t signo;
    Signal *signal = GetSignalByName (signal_name, signo);
    if (signal == NULL)
        return false;
    else
    {
        bool ret_value = signal->m_conditions[cond_pos];
        signal->m_conditions[cond_pos] = value;
        return ret_value;
    }
}

bool
UnixSignals::GetShouldSuppress (int signo) const
{
    return GetCondition (signo, Signal::eCondSuppress);
}

bool
UnixSignals::SetShouldSuppress (int signo, bool value)
{
    return SetCondition (signo, Signal::eCondSuppress, value);
}

bool
UnixSignals::SetShouldSuppress (const char *signal_name, bool value)
{
    return SetCondition (signal_name, Signal::eCondSuppress, value);
}

bool
UnixSignals::GetShouldStop (int signo) const
{
    return GetCondition (signo, Signal::eCondStop);
}

bool
UnixSignals::SetShouldStop (int signo, bool value)
{
    return SetCondition (signo, Signal::eCondStop, value);
}

bool
UnixSignals::SetShouldStop (const char *signal_name, bool value)
{
    return SetCondition (signal_name, Signal::eCondStop, value);
}

bool
UnixSignals::GetShouldNotify (int signo) const
{
    return GetCondition (signo, Signal::eCondNotify);
}

bool
UnixSignals::SetShouldNotify (int signo, bool value)
{
    return SetCondition (signo, Signal::eCondNotify, value);
}

bool
UnixSignals::SetShouldNotify (const char *signal_name, bool value)
{
    return SetCondition (signal_name, Signal::eCondNotify, value);
}