C++ wxLogSysError函数代码示例

bool wxFFile::Seek(wxFileOffset ofs, wxSeekMode mode)
{
    wxCHECK_MSG( IsOpened(), false, wxT("can't seek on closed file") );

    int origin;
    switch ( mode )
    {
        default:
            wxFAIL_MSG(wxT("unknown seek mode"));
            // still fall through

        case wxFromStart:
            origin = SEEK_SET;
            break;

        case wxFromCurrent:
            origin = SEEK_CUR;
            break;

        case wxFromEnd:
            origin = SEEK_END;
            break;
    }

#ifndef wxHAS_LARGE_FFILES
    if ((long)ofs != ofs)
    {
        wxLogError(_("Seek error on file '%s' (large files not supported by stdio)"), m_name.c_str());

        return false;
    }

    if ( wxFseek(m_fp, (long)ofs, origin) != 0 )
#else
    if ( wxFseek(m_fp, ofs, origin) != 0 )
#endif
    {
        wxLogSysError(_("Seek error on file '%s'"), m_name.c_str());

        return false;
    }

    return true;
}

bool wxEpollDispatcher::ModifyFD(int fd, wxFDIOHandler* handler, int flags)
{
    epoll_event ev;
    ev.events = GetEpollMask(flags, fd);
    ev.data.ptr = handler;

    const int ret = epoll_ctl(m_epollDescriptor, EPOLL_CTL_MOD, fd, &ev);
    if ( ret != 0 )
    {
        wxLogSysError(_("Failed to modify descriptor %d in epoll descriptor %d"),
                      fd, m_epollDescriptor);

        return false;
    }

    wxLogTrace(wxEpollDispatcher_Trace,
                wxT("Modified fd %d (handler: %p) on epoll %d"), fd, handler, m_epollDescriptor);
    return true;
}

bool wxEpollDispatcher::RegisterFD(int fd, wxFDIOHandler* handler, int flags)
{
    epoll_event ev;
    ev.events = GetEpollMask(flags, fd);
    ev.data.ptr = handler;

    const int ret = epoll_ctl(m_epollDescriptor, EPOLL_CTL_ADD, fd, &ev);
    if ( ret != 0 )
    {
        wxLogSysError(_("Failed to add descriptor %d to epoll descriptor %d"),
                      fd, m_epollDescriptor);

        return false;
    }
    wxLogTrace(wxEpollDispatcher_Trace,
               _T("Added fd %d (handler %p) to epoll %d"), fd, handler, m_epollDescriptor);

    return true;
}

void wxThreadInternal::Wait()
{
   wxCHECK_RET( !m_isDetached, wxT("can't wait for a detached thread") );

    // if the thread we're waiting for is waiting for the GUI mutex, we will
    // deadlock so make sure we release it temporarily
    if ( wxThread::IsMain() )
    {
        // give the thread we're waiting for chance to do the GUI call
        // it might be in, we don't do this conditionally as the to be waited on
        // thread might have to acquire the mutex later but before terminating
        if ( wxGuiOwnedByMainThread() )
            wxMutexGuiLeave();
    }

    {
        wxCriticalSectionLocker lock(m_csJoinFlag);

        if ( m_shouldBeJoined )
        {
            void *param1, *param2, *rc;

            OSStatus err = MPWaitOnQueue(
                m_notifyQueueId,
                &param1,
                &param2,
                &rc,
                kDurationForever );
            if (err != noErr)
            {
                wxLogSysError( wxT( "Cannot wait for thread termination."));
                rc = (void*) -1;
            }

            // actually param1 would be the address of m_exitcode
            // but we don't need this here
            m_exitcode = rc;

            m_shouldBeJoined = false;
        }
    }
}

    int ReadEventsToBuf(char* buf, int size)
    {
        wxCHECK_MSG( IsOk(), false,
                    "Inotify not initialized or invalid inotify descriptor" );

        memset(buf, 0, size);
        ssize_t left = read(m_ifd, buf, size);
        if (left == -1)
        {
            wxLogSysError(_("Unable to read from inotify descriptor"));
            return -1;
        }
        else if (left == 0)
        {
            wxLogWarning(_("EOF while reading from inotify descriptor"));
            return -1;
        }

        return left;
    }

    virtual bool DoRemove(wxSharedPtr<wxFSWatchEntryUnix> watch)
    {
        wxCHECK_MSG( IsOk(), false,
                    "Inotify not initialized or invalid inotify descriptor" );

        int ret = DoRemoveInotify(watch.get());
        if (ret == -1)
        {
            wxLogSysError( _("Unable to remove inotify watch") );
            return false;
        }

        if (m_watchMap.erase(watch->GetWatchDescriptor()) != 1)
        {
            wxFAIL_MSG( wxString::Format("Path %s is not watched",
                                          watch->GetPath()) );
        }
        watch->SetWatchDescriptor(-1);
        return true;
    }

bool wxThreadInternal::Resume()
{
    ULONG ulrc = ::DosResumeThread(m_hThread);

    if (ulrc != 0)
    {
        wxLogSysError(_("Can not resume thread %lu"), m_hThread);
        return false;
    }

    // don't change the state from STATE_EXITED because it's special and means
    // we are going to terminate without running any user code - if we did it,
    // the codei n Delete() wouldn't work
    if ( m_eState != STATE_EXITED )
    {
        m_eState = STATE_RUNNING;
    }

    return true;
}

int wxEpollDispatcher::Dispatch(int timeout)
{
    epoll_event events[16];

    const int rc = DoPoll(events, WXSIZEOF(events), timeout);

    if ( rc == -1 )
    {
        wxLogSysError(_("Waiting for IO on epoll descriptor %d failed"),
                      m_epollDescriptor);
        return -1;
    }

    int numEvents = 0;
    for ( epoll_event *p = events; p < events + rc; p++ )
    {
        wxFDIOHandler * const handler = (wxFDIOHandler *)(p->data.ptr);
        if ( !handler )
        {
            wxFAIL_MSG( wxT("NULL handler in epoll_event?") );
            continue;
        }

        // note that for compatibility with wxSelectDispatcher we call
        // OnReadWaiting() on EPOLLHUP as this is what epoll_wait() returns
        // when the write end of a pipe is closed while with select() the
        // remaining pipe end becomes ready for reading when this happens
        if ( p->events & (EPOLLIN | EPOLLHUP) )
            handler->OnReadWaiting();
        else if ( p->events & EPOLLOUT )
            handler->OnWriteWaiting();
        else if ( p->events & EPOLLERR )
            handler->OnExceptionWaiting();
        else
            continue;

        numEvents++;
    }

    return numEvents;
}

// get current file length
wxFileOffset wxFile::Length() const
{
    wxASSERT( IsOpened() );

    // we use a special method for Linux systems where files in sysfs (i.e.
    // those under /sys typically) return length of 4096 bytes even when
    // they're much smaller -- this is a problem as it results in errors later
    // when we try reading 4KB from them
#ifdef __LINUX__
    struct stat st;
    if ( fstat(m_fd, &st) == 0 )
    {
        // returning 0 for the special files indicates to the caller that they
        // are not seekable
        return st.st_blocks ? st.st_size : 0;
    }
    //else: failed to stat, try the normal method
#endif // __LINUX__

    wxFileOffset iRc = Tell();
    if ( iRc != wxInvalidOffset ) {
        wxFileOffset iLen = const_cast<wxFile *>(this)->SeekEnd();
        if ( iLen != wxInvalidOffset ) {
            // restore old position
            if ( ((wxFile *)this)->Seek(iRc) == wxInvalidOffset ) {
                // error
                iLen = wxInvalidOffset;
            }
        }

        iRc = iLen;
    }

    if ( iRc == wxInvalidOffset )
    {
        // last error was already set by Tell()
        wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);
    }

    return iRc;
}

wxMutexError wxMutexInternal::Lock(unsigned long ms)
{
    wxCHECK_MSG( m_isOk , wxMUTEX_MISC_ERROR , wxT("Invalid Mutex") );

    OSStatus err = MPEnterCriticalRegion( m_critRegion, ms );
    switch ( err )
    {
        case noErr:
            break;

        case kMPTimeoutErr:
            wxASSERT_MSG( ms != kDurationForever, wxT("unexpected timeout") );
            return wxMUTEX_TIMEOUT;

        default:
            wxLogSysError(wxT("Could not lock mutex"));
            return wxMUTEX_MISC_ERROR;
    }

    return wxMUTEX_NO_ERROR;
}

/* static */
THREAD_RETVAL wxThreadInternal::DoThreadStart(wxThread *thread)
{
    wxON_BLOCK_EXIT1(DoThreadOnExit, thread);

    THREAD_RETVAL rc = THREAD_ERROR_EXIT;

    wxTRY
    {
        // store the thread object in the TLS
        if ( !::TlsSetValue(gs_tlsThisThread, thread) )
        {
            wxLogSysError(_("Cannot start thread: error writing TLS."));

            return THREAD_ERROR_EXIT;
        }

        rc = wxPtrToUInt(thread->Entry());
    }
    wxCATCH_ALL( wxTheApp->OnUnhandledException(); )

    return rc;

    bool Init()
    {
        wxCHECK_MSG( !IsOk(), false,
                     "Kqueue appears to be already initialized" );

        wxEventLoopBase *loop = wxEventLoopBase::GetActive();
        wxCHECK_MSG( loop, false, "File system watcher needs an active loop" );

        // create kqueue
        m_kfd = kqueue();
        if (m_kfd == -1)
        {
            wxLogSysError(_("Unable to create kqueue instance"));
            return false;
        }

        // create source
        m_source = loop->AddSourceForFD(m_kfd, m_handler, wxEVENT_SOURCE_INPUT);

        return m_source != NULL;
    }

wxThreadError wxThread::Kill()
{
    if ( !IsRunning() )
        return wxTHREAD_NOT_RUNNING;

//    if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
    {
        wxLogSysError(_("Couldn't terminate thread"));

        return wxTHREAD_MISC_ERROR;
    }

    m_internal->Free();

    if ( IsDetached() )
    {
        delete this;
    }

    return wxTHREAD_NO_ERROR;
}

bool wxThreadInternal::Suspend()
{
    OSErr err ;

    err = ::ThreadBeginCritical();
    wxASSERT( err == noErr ) ;

    if ( m_state != STATE_RUNNING )
    {
        err = ::ThreadEndCritical() ;
        wxASSERT( err == noErr ) ;
        wxLogSysError(_("Can not suspend thread %x"), m_tid);
        return FALSE;
    }

    m_state = STATE_PAUSED;

    err = ::SetThreadStateEndCritical(m_tid, kStoppedThreadState, kNoThreadID);

    return TRUE;
}

/* static */
void wxGUIEventLoop::InitBuffer()
{
    // create DirectFB events buffer:
    ms_buffer = wxIDirectFB::Get()->CreateEventBuffer();

    // and setup a file descriptor that we can watch for new events:

    ms_buffer->CreateFileDescriptor(&ms_bufferFd);
    int flags = fcntl(ms_bufferFd, F_GETFL, 0);
    if ( flags == -1 || fcntl(ms_bufferFd, F_SETFL, flags | O_NONBLOCK) == -1 )
    {
        wxLogSysError(_("Failed to switch DirectFB pipe to non-blocking mode"));
        return;
    }

    wxFDIODispatcher *dispatcher = wxFDIODispatcher::Get();
    wxCHECK_RET( dispatcher, "wxDFB requires wxFDIODispatcher" );

    gs_DFBEventsHandler.SetFD(ms_bufferFd);
    dispatcher->RegisterFD(ms_bufferFd, &gs_DFBEventsHandler, wxFDIO_INPUT);
}