ProcessBuf Class Reference

A std::streambuf interface for creating child processes and writing/reading data via stdin/stdout. More...

#include <include/dlvhex2/ProcessBuf.h>

Public Member Functions
	ProcessBuf ()
	Constructor.
	ProcessBuf (const ProcessBuf &b)
	Copy-constructor.
virtual	~ProcessBuf ()
	Destructor.
virtual void	endoffile ()
	Send EOF to the process.
virtual pid_t	open (const std::vector< std::string > &c)
	Open a commandline in a seprate process.
virtual int	close (bool kill=false)
	Wait for end of process.
Protected Member Functions
virtual std::streambuf::int_type	overflow (std::streambuf::int_type c)
	Called when an overflow occurred.
virtual std::streambuf::int_type	underflow ()
	Called when an underflow occurred.
virtual std::streambuf::int_type	sync ()
	Synchronization.
Private Member Functions
void	initBuffers ()
	Initializes obuf and ibuf.
Private Attributes
int	status
	Status of the child process.
unsigned	bufsize
	Buffer size.
std::streambuf::char_type *	obuf
	Data of the output buffer.
std::streambuf::char_type *	ibuf
	Data of the input buffer.

---

Detailed Description

A std::streambuf interface for creating child processes and writing/reading data via stdin/stdout.

Definition at line 63 of file ProcessBuf.h.

---

Constructor & Destructor Documentation

DLVHEX_NAMESPACE_BEGIN ProcessBuf::ProcessBuf

(

)

Constructor.

Definition at line 60 of file ProcessBuf.cpp.

References initBuffers().

ProcessBuf::ProcessBuf

(

const ProcessBuf &

b

)

Copy-constructor.

Parameters:

b	Other ProcessBuf.

Definition at line 84 of file ProcessBuf.cpp.

References initBuffers().

ProcessBuf::~ProcessBuf

(

)

[virtual]

Destructor.

Definition at line 104 of file ProcessBuf.cpp.

References close(), ibuf, and obuf.

---

Member Function Documentation

int ProcessBuf::close

(

bool

kill = false

)

[virtual]

Wait for end of process.

Parameters:

If	true the process will be killed, otherwise the method waits.

Returns:

Return code of the process.

Definition at line 338 of file ProcessBuf.cpp.

References endoffile(), ibuf, LOG, and status.

Referenced by DLVProcess::close(), endoffile(), open(), DLVProcess::~DLVProcess(), and ~ProcessBuf().

void ProcessBuf::endoffile

(

)

[virtual]

Send EOF to the process.

Definition at line 300 of file ProcessBuf.cpp.

References bufsize, close(), and obuf.

Referenced by close(), and DLVProcess::endoffile().

void ProcessBuf::initBuffers

(

)

[private]

Initializes obuf and ibuf.

Definition at line 121 of file ProcessBuf.cpp.

References bufsize, ibuf, and obuf.

Referenced by ProcessBuf().

pid_t ProcessBuf::open

(

const std::vector< std::string > &

c

)

[virtual]

Open a commandline in a seprate process.

Parameters:

c	Commandline to open.

Returns:

Process ID if the new process.

Definition at line 131 of file ProcessBuf.cpp.

References close(), LOG, printvector(), and WARNING().

Referenced by DLVProcess::spawn().

std::streambuf::int_type ProcessBuf::overflow

(

std::streambuf::int_type

c

)

[protected, virtual]

Called when an overflow occurred.

Parameters:

c	See std::streambuf.

Returns:

std::streambuf.

Definition at line 416 of file ProcessBuf.cpp.

References sync().

std::streambuf::int_type ProcessBuf::sync

(

)

[protected, virtual]

Synchronization.

Parameters:

c	See std::streambuf.

Returns:

std::streambuf.

Definition at line 477 of file ProcessBuf.cpp.

References bufsize, ibuf, and obuf.

Referenced by overflow().

std::streambuf::int_type ProcessBuf::underflow

(

)

[protected, virtual]

Called when an underflow occurred.

Parameters:

c	See std::streambuf.

Returns:

std::streambuf.

Definition at line 436 of file ProcessBuf.cpp.

References bufsize, and ibuf.

---

Field Documentation

unsigned ProcessBuf::bufsize [private]

Buffer size.

Definition at line 119 of file ProcessBuf.h.

Referenced by endoffile(), initBuffers(), sync(), and underflow().

std::streambuf::char_type* ProcessBuf::ibuf [private]

Data of the input buffer.

Definition at line 124 of file ProcessBuf.h.

Referenced by close(), initBuffers(), sync(), underflow(), and ~ProcessBuf().

std::streambuf::char_type* ProcessBuf::obuf [private]

Data of the output buffer.

Definition at line 122 of file ProcessBuf.h.

Referenced by endoffile(), initBuffers(), sync(), and ~ProcessBuf().

int ProcessBuf::status [private]

Status of the child process.

Definition at line 117 of file ProcessBuf.h.

Referenced by close().

---

The documentation for this class was generated from the following files:

• include/dlvhex2/ProcessBuf.h
• src/ProcessBuf.cpp