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//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
//
// copyright : (C) 2014 Eran Ifrah
// file name : named_pipe.cpp
//
// -------------------------------------------------------------------------
// A
// _____ _ _ _ _
// / __ \ | | | | (_) |
// | / \/ ___ __| | ___| | _| |_ ___
// | | / _ \ / _ |/ _ \ | | | __/ _ )
// | \__/\ (_) | (_| | __/ |___| | || __/
// \____/\___/ \__,_|\___\_____/_|\__\___|
//
// F i l e
//
// 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.
//
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
#include "named_pipe.h"
#ifndef __WXMSW__
# include <sys/types.h>
# include <sys/unistd.h>
# include <sys/socket.h>
# include <sys/time.h>
#endif
#ifdef __WXMSW__
class HandleLocker
{
HANDLE m_event;
public:
HandleLocker(HANDLE event) : m_event(event) {}
~HandleLocker() {
if(m_event != INVALID_PIPE_HANDLE)
CloseHandle(m_event);
}
};
#endif
clNamedPipe::clNamedPipe(const char* pipePath)
: _pipeHandle(INVALID_PIPE_HANDLE)
, _lastError(ZNP_OK)
{
setPipePath(pipePath);
}
clNamedPipe::~clNamedPipe()
{
}
bool clNamedPipe::write( const void* data, size_t dataLength, size_t *written, long timeToLive )
{
#ifdef __WXMSW__
_lastError = ZNP_OK;
OVERLAPPED ov = {0};
ov.hEvent = CreateEvent(NULL, FALSE, TRUE, NULL);
HandleLocker locker(ov.hEvent);
DWORD actualWrote;
if (!WriteFile(_pipeHandle, data, (DWORD)dataLength, &actualWrote, &ov)) {
*written = static_cast<int>(actualWrote);
int err = GetLastError();
if (err == ERROR_IO_PENDING) {
if (WaitForSingleObject(ov.hEvent, timeToLive) == WAIT_OBJECT_0) {
//data is ready
if (!GetOverlappedResult(_pipeHandle, &ov, &actualWrote, FALSE)) {
setLastError(ZNP_WRITE_ERROR);
return false;
}
*written = static_cast<int>(actualWrote);
} else {
// the wait exited on the timeout
setLastError(ZNP_TIMEOUT);
CancelIo(_pipeHandle);
return false;
}
} else {
this->setLastError(ZNP_WRITE_ERROR);
return false;
}
}
*written = static_cast<int>(actualWrote);
return true;
#else
int dataSent(0);
dataSent = ::write(_pipeHandle, data, dataLength);
if (dataSent < 0) {
setLastError(ZNP_WRITE_ERROR);
return false;
}
*written = dataSent;
return true;
#endif
}
bool clNamedPipe::read( void* data, size_t dataLength, size_t *read, long timeToLive )
{
#ifdef __WXMSW__
_lastError = ZNP_OK;
OVERLAPPED ov = {0};
ov.hEvent = CreateEvent(NULL, FALSE, TRUE, NULL);
HandleLocker locker( ov.hEvent );
//start an asynch read on the named pipe
if (!ReadFile(_pipeHandle, data, (DWORD)dataLength, (LPDWORD) read, &ov)) {
int err = GetLastError();
if (err == ERROR_IO_PENDING) {
DWORD waitRes;
//wait for the asynch result
waitRes = WaitForSingleObject(ov.hEvent, timeToLive);
if ( waitRes == WAIT_OBJECT_0) {
//data is ready
if (!GetOverlappedResult(_pipeHandle, &ov, (LPDWORD) read, FALSE)) {
this->setLastError(ZNP_READ_ERROR);
return false;
}
} else {
// the wait exited on the timeout
this->setLastError(ZNP_TIMEOUT);
CancelIo(_pipeHandle);
return false;
}
} else {
this->setLastError(ZNP_READ_ERROR);
return false;
}
}
return true;
#else
fd_set rset;
FD_ZERO(&rset);
FD_SET(_pipeHandle, &rset);
struct timeval tv;
struct timeval *ptv = NULL;
if (timeToLive > 0) {
tv.tv_sec = timeToLive / 1000;
tv.tv_usec = (timeToLive % 1000)*1000;
ptv = &tv;
}
int rc = select(_pipeHandle+1, &rset, 0, 0, ptv);
if (rc == 0) {
// timeout
setLastError(ZNP_TIMEOUT);
return false;
} else if(rc < 0){
// error
setLastError(ZNP_UNKNOWN);
return false;
} else {
// read the data
int dataRead (0);
dataRead = ::read(_pipeHandle, data, dataLength);
if(dataRead < 0){
setLastError(ZNP_READ_ERROR);
return false;
} else if(dataRead == 0) {
setLastError(ZNP_CONN_CLOSED);
return false;
}
*read = dataRead;
return true;
}
#endif
}
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