anonymouspipeposix.cpp

Pegasus is an open-source implementationof the DMTF CIM and WBEM standards. It is designed to be por

//%2006////////////////////////////////////////////////////////////////////////
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// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
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#include "AnonymousPipe.h"
#include <Pegasus/Common/Signal.h>

#if defined (PEGASUS_OS_VMS)
# include <climsgdef.h>
# include <stdio.h>
# include <stdlib.h>
# include <perror.h>
# include <processes.h>
#endif /* PEGASUS_OS_VMS */

#if defined (PEGASUS_OS_OS400)
# include <unistd.cleinc>
#else
# include <unistd.h>
#endif
#include <errno.h>

PEGASUS_NAMESPACE_BEGIN

AnonymousPipe::AnonymousPipe ()
{
    PEG_METHOD_ENTER (TRC_OS_ABSTRACTION, "AnonymousPipe::AnonymousPipe ()");

    AnonymousPipeHandle thePipe [2];
    if (pipe (thePipe) < 0)
    {
        Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
            "Failed to create pipe: %s", strerror (errno));
        PEG_METHOD_EXIT ();

        MessageLoaderParms mlp ("Common.AnonymousPipe.CREATE_PIPE_FAILED",
            "Failed to create pipe.");
        throw Exception (mlp);
    }

    _readHandle = thePipe [0];
    _writeHandle = thePipe [1];
    _readOpen = true;
    _writeOpen = true;

    PEG_METHOD_EXIT ();
}

AnonymousPipe::AnonymousPipe (
    const char * readHandle,
    const char * writeHandle)
{
    PEG_METHOD_ENTER (TRC_OS_ABSTRACTION,
        "AnonymousPipe::AnonymousPipe (const char *, const char *)");

    _readHandle = 0;
    _writeHandle = 0;
    _readOpen = false;
    _writeOpen = false;

    if (readHandle != NULL)
    {
        if (sscanf (readHandle, "%d", &_readHandle) != 1)
        {
            Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
                "Failed to create pipe: invalid read handle %s", readHandle);
            PEG_METHOD_EXIT ();

            MessageLoaderParms mlp ("Common.AnonymousPipe.CREATE_PIPE_FAILED",
                "Failed to create pipe.");
            throw Exception (mlp);
        }
        _readOpen = true;
    }

    if (writeHandle != NULL)
    {
        if (sscanf (writeHandle, "%d", &_writeHandle) != 1)
        {
            Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
                "Failed to create pipe: invalid write handle %s", writeHandle);
            PEG_METHOD_EXIT ();

            MessageLoaderParms mlp ("Common.AnonymousPipe.CREATE_PIPE_FAILED",
                "Failed to create pipe.");
            throw Exception (mlp);
        }
        _writeOpen = true;
    }

    PEG_METHOD_EXIT ();
}

AnonymousPipe::~AnonymousPipe ()
{
    PEG_METHOD_ENTER (TRC_OS_ABSTRACTION, "AnonymousPipe::~AnonymousPipe");

    if (_readOpen)
    {
        closeReadHandle ();
    }
    if (_writeOpen)
    {
        closeWriteHandle ();
    }

    PEG_METHOD_EXIT ();
}

AnonymousPipe::Status AnonymousPipe::writeBuffer (
    const void * buffer,
    Uint32 bytesToWrite)
{
    //
    //  Treat invalid handle as connection closed
    //
    if (!_writeOpen)
    {
        Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
            "Attempted to write to pipe whose write handle is not open");
        return STATUS_CLOSED;
    }

    //
    //  Ignore SIGPIPE signals
    //
    SignalHandler::ignore (PEGASUS_SIGPIPE);

    const char * writeBuffer = reinterpret_cast<const char*>(buffer);
    int expectedBytes = bytesToWrite;
    do
    {
        int bytesWritten = write (_writeHandle, writeBuffer, expectedBytes);

        if (bytesWritten < 0)
        {
            Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
                "Failed to write buffer to pipe: %s", strerror (errno));

            if (errno == EPIPE)
            {
                //
                //  Other end of pipe is closed
                //
                return STATUS_CLOSED;
            }
            else if (errno == EINTR)
            {
                //
                //  Keep trying to write
                //
                bytesWritten = 0;
            }
            else
            {
                return STATUS_ERROR;
            }
        }

        expectedBytes -= bytesWritten;
        writeBuffer += bytesWritten;
    } while (expectedBytes > 0);

    return STATUS_SUCCESS;
}

AnonymousPipe::Status AnonymousPipe::readBuffer (
    void * buffer,
    Uint32 bytesToRead)
{
    //
    //  Treat invalid handle as connection closed
    //
    if (!_readOpen)
    {
        Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
            "Attempted to read from pipe whose read handle is not open");
        return STATUS_CLOSED;
    }

    Uint32 expectedBytes = bytesToRead;

    do
    {
        int bytesRead = read (_readHandle, buffer, bytesToRead);

        if (bytesRead == 0)
        {
            //
            //  Connection closed
            //
            Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
                "Failed to read buffer from pipe: connection closed");
            return STATUS_CLOSED;
        }

        if (bytesRead < 0)
        {
            Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
                "Failed to read buffer from pipe: %s", strerror (errno));

            //
            //  If read was interrupted, keep trying
            //  Otherwise, return error
            //
            if (errno == EINTR)
            {
                if (bytesToRead == expectedBytes)
                {
                    //
                    //  Got a signal and haven't read any bytes yet
                    //
                    return STATUS_INTERRUPT;
                }
                bytesRead = 0;
            }
            else
            {
                //
                //  Error reading from pipe
                //
                return STATUS_ERROR;
            }
        }

        buffer = reinterpret_cast<char *>(buffer) + bytesRead;
        bytesToRead -= bytesRead;
    } while (bytesToRead > 0);

    return STATUS_SUCCESS;
}

void AnonymousPipe::exportReadHandle (
    char * buffer) const
{
    PEG_METHOD_ENTER (TRC_OS_ABSTRACTION, "AnonymousPipe::exportReadHandle");

    sprintf (buffer, "%d", _readHandle);

    PEG_METHOD_EXIT ();
}

void AnonymousPipe::exportWriteHandle (
    char * buffer) const
{
    PEG_METHOD_ENTER (TRC_OS_ABSTRACTION, "AnonymousPipe::exportWriteHandle");

    sprintf (buffer, "%d", _writeHandle);

    PEG_METHOD_EXIT ();
}

void AnonymousPipe::closeReadHandle ()
{
    PEG_METHOD_ENTER (TRC_OS_ABSTRACTION, "AnonymousPipe::closeReadHandle");

    if (_readOpen)
    {
        if (close (_readHandle) != 0)
        {
            Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
                "Failed to close read handle: %s", strerror (errno));
        }
        else
        {
            _readOpen = false;
        }
    }
    else
    {
        Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
            "Attempted to close read handle that was not open");
    }

    PEG_METHOD_EXIT ();
}

void AnonymousPipe::closeWriteHandle ()
{
    PEG_METHOD_ENTER (TRC_OS_ABSTRACTION, "AnonymousPipe::closeWriteHandle");

    if (_writeOpen)
    {
        if (close (_writeHandle) != 0)
        {
            Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
                "Failed to close write handle: %s", strerror (errno));
        }
        else
        {
            _writeOpen = false;
        }
    }
    else
    {
        Tracer::trace (TRC_OS_ABSTRACTION, Tracer::LEVEL2,
            "Attempted to close write handle that was not open");
    }

    PEG_METHOD_EXIT ();
}

PEGASUS_NAMESPACE_END