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/********************************************************************************
* *
* P i p e C l a s s *
* *
*********************************************************************************
* Copyright (C) 2005,2022 by Jeroen van der Zijp. All Rights Reserved. *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/> *
********************************************************************************/
#include "xincs.h"
#include "fxver.h"
#include "fxdefs.h"
#include "fxascii.h"
#include "FXArray.h"
#include "FXHash.h"
#include "FXStream.h"
#include "FXString.h"
#include "FXPath.h"
#include "FXIO.h"
#include "FXIODevice.h"
#include "FXPipe.h"
/*
Notes:
- Create a pipe for reading or writing; if created for reading,
the "other" is the write-side. If created for writing, the
"other" is the read-side.
- The pipe may be inherited by a sub-process if so indicated.
- On Linux, we prefer to use pipe2(), elsewhere we use pipe()
and set the flags properly afterwards, using fcntl().
- Both our end the other end FXPipe instances should not be open
yet prior to a call to open().
- FIXME Probably need special class to implement unix socket
or named pipe, this will be just for anonymous pipes.
*/
// Bad handle value
#ifdef WIN32
#define BadHandle INVALID_HANDLE_VALUE
#else
#define BadHandle -1
#endif
using namespace FX;
/*******************************************************************************/
namespace FX {
// Construct and open pipes with access mode m for this one and the reverse for the other
FXPipe::FXPipe(FXPipe& other,FXuint m){
open(other,m);
}
// Construct file and attach existing handle h
FXPipe::FXPipe(FXInputHandle h){
attach(h);
}
#if defined(WIN32)
// Open pipes with access mode m for this one and the reverse for the other
FXbool FXPipe::open(FXPipe& other,FXuint m){
if(device==BadHandle && other.device==BadHandle){
HANDLE hnd[2];
// Inheritable
SECURITY_ATTRIBUTES security;
security.nLength=sizeof(SECURITY_ATTRIBUTES);
security.bInheritHandle=((m&FXIO::Inheritable)==0);
security.lpSecurityDescriptor=nullptr;
// Create connected pipe
if(CreatePipe(&hnd[0],&hnd[1],&security,0)!=0){
// Who's is the read-side?
if(m&FXIO::ReadOnly){
device=hnd[0];
other.device=hnd[1];
}
else{
device=hnd[1];
other.device=hnd[0];
}
return true;
}
}
return false;
}
#else
// Open pipes with access mode m for this one and the reverse for the other
FXbool FXPipe::open(FXPipe& other,FXuint m){
if(device==BadHandle && other.device==BadHandle){
FXint hnd[2];
#if defined(HAVE_PIPE2)
FXint flags=0;
// Non-blocking
if(m&FXIO::NonBlocking){ flags|=O_NONBLOCK; }
// Inheritable
#if defined(O_CLOEXEC)
if(!(m&FXIO::Inheritable)){ flags|=O_CLOEXEC; }
#endif
// Create pipe
if(pipe2(hnd,flags)==0){
// Who's is the read-side?
if(m&FXIO::ReadOnly){
device=hnd[0];
other.device=hnd[1];
}
else{
device=hnd[1];
other.device=hnd[0];
}
return true;
}
#else
// Create pipe
if(pipe(hnd)==0){
// Who's is the read-side?
if(m&FXIO::ReadOnly){
device=hnd[0];
other.device=hnd[1];
}
else{
device=hnd[1];
other.device=hnd[0];
}
// Non-blocking
if(m&FXIO::NonBlocking){
fcntl(device,F_SETFL,O_NONBLOCK);
}
// Inheritable
#if defined(O_CLOEXEC)
if(!(m&FXIO::Inheritable)){
fcntl(device,F_SETFD,FD_CLOEXEC);
}
#endif
return true;
}
#endif
}
return false;
}
#endif
/*******************************************************************************/
// Create a named pipe (not available on Windows)
FXbool FXPipe::create(const FXString& file,FXuint perm){
#if !defined(WIN32)
if(!file.empty()){
return ::mkfifo(file.text(),perm&0777)==0;
}
#endif
return false;
}
// Remove a named pipe (not available on Windows)
FXbool FXPipe::remove(const FXString& file){
#if !defined(WIN32)
if(!file.empty()){
return ::unlink(file.text())==0;
}
#endif
return false;
}
/*
// FIXME move elsewhere
HANDLE WINAPI CreateNamedPipe(
__in LPCTSTR lpName,
__in DWORD dwOpenMode,
__in DWORD dwPipeMode,
__in DWORD nMaxInstances,
__in DWORD nOutBufferSize,
__in DWORD nInBufferSize,
__in DWORD nDefaultTimeOut,
__in_opt LPSECURITY_ATTRIBUTES lpSecurityAttributes
);
*/
}
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