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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include <pal.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <pal_assert.h>
#include "twowaypipe.h"
// Creates a server side of the pipe.
// Id is used to create pipes names and uniquely identify the pipe on the machine.
// true - success, false - failure (use GetLastError() for more details)
bool TwoWayPipe::CreateServer(DWORD id)
{
_ASSERTE(m_state == NotInitialized);
if (m_state != NotInitialized)
return false;
m_id = id;
PAL_GetTransportPipeName(m_inPipeName, id, "in");
PAL_GetTransportPipeName(m_outPipeName, id, "out");
if (mkfifo(m_inPipeName, S_IRWXU) == -1)
{
return false;
}
if (mkfifo(m_outPipeName, S_IRWXU) == -1)
{
unlink(m_inPipeName);
return false;
}
m_state = Created;
return true;
}
// Connects to a previously opened server side of the pipe.
// Id is used to locate the pipe on the machine.
// true - success, false - failure (use GetLastError() for more details)
bool TwoWayPipe::Connect(DWORD id)
{
_ASSERTE(m_state == NotInitialized);
if (m_state != NotInitialized)
return false;
m_id = id;
//"in" and "out" are switched deliberately, because we're on the client
PAL_GetTransportPipeName(m_inPipeName, id, "out");
PAL_GetTransportPipeName(m_outPipeName, id, "in");
// Pipe opening order is reversed compared to WaitForConnection()
// in order to avaid deadlock.
m_outboundPipe = open(m_outPipeName, O_WRONLY);
if (m_outboundPipe == INVALID_PIPE)
{
return false;
}
m_inboundPipe = open(m_inPipeName, O_RDONLY);
if (m_inboundPipe == INVALID_PIPE)
{
close(m_outboundPipe);
m_outboundPipe = INVALID_PIPE;
return false;
}
m_state = ClientConnected;
return true;
}
// Waits for incoming client connections, assumes GetState() == Created
// true - success, false - failure (use GetLastError() for more details)
bool TwoWayPipe::WaitForConnection()
{
_ASSERTE(m_state == Created);
if (m_state != Created)
return false;
m_inboundPipe = open(m_inPipeName, O_RDONLY);
if (m_inboundPipe == INVALID_PIPE)
{
return false;
}
m_outboundPipe = open(m_outPipeName, O_WRONLY);
if (m_outboundPipe == INVALID_PIPE)
{
close(m_inboundPipe);
m_inboundPipe = INVALID_PIPE;
return false;
}
m_state = ServerConnected;
return true;
}
// Reads data from pipe. Returns number of bytes read or a negative number in case of an error.
// use GetLastError() for more details
// UNIXTODO - mjm 9/6/15 - does not set last error on failure
int TwoWayPipe::Read(void *buffer, DWORD bufferSize)
{
_ASSERTE(m_state == ServerConnected || m_state == ClientConnected);
int totalBytesRead = 0;
int bytesRead;
int cb = bufferSize;
while ((bytesRead = (int)read(m_inboundPipe, buffer, cb)) > 0)
{
totalBytesRead += bytesRead;
_ASSERTE(totalBytesRead <= bufferSize);
if (totalBytesRead >= bufferSize)
{
break;
}
buffer = (char*)buffer + bytesRead;
cb -= bytesRead;
}
return bytesRead == -1 ? -1 : totalBytesRead;
}
// Writes data to pipe. Returns number of bytes written or a negative number in case of an error.
// use GetLastError() for more details
// UNIXTODO - mjm 9/6/15 - does not set last error on failure
int TwoWayPipe::Write(const void *data, DWORD dataSize)
{
_ASSERTE(m_state == ServerConnected || m_state == ClientConnected);
int totalBytesWritten = 0;
int bytesWritten;
int cb = dataSize;
while ((bytesWritten = (int)write(m_outboundPipe, data, cb)) > 0)
{
totalBytesWritten += bytesWritten;
_ASSERTE(totalBytesWritten <= dataSize);
if (totalBytesWritten >= dataSize)
{
break;
}
data = (char*)data + bytesWritten;
cb -= bytesWritten;
}
return bytesWritten == -1 ? -1 : totalBytesWritten;
}
// Disconnect server or client side of the pipe.
// true - success, false - failure (use GetLastError() for more details)
bool TwoWayPipe::Disconnect()
{
// IMPORTANT NOTE: This function must not call any signal unsafe functions
// since it is called from signal handlers.
// That includes ASSERT and TRACE macros.
if (m_state == ServerConnected || m_state == Created)
{
unlink(m_inPipeName);
unlink(m_outPipeName);
}
m_state = NotInitialized;
return true;
}
// Used by debugger side (RS) to cleanup the target (LS) named pipes
// and semaphores when the debugger detects the debuggee process exited.
void TwoWayPipe::CleanupTargetProcess()
{
unlink(m_inPipeName);
unlink(m_outPipeName);
}
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