PProcess Class Reference

#include <pprocess.h>

Inheritance diagram for PProcess:

List of all members.

Construction
enum	CodeStatus { AlphaCode, BetaCode, ReleaseCode, NumCodeStatuses }
	Release status for the program. More...
	PProcess (const char *manuf="", const char *name="", WORD majorVersion=1, WORD minorVersion=0, CodeStatus status=ReleaseCode, WORD buildNumber=1)
Process information functions
virtual void	OnThreadStart (PThread &thread)
virtual void	OnThreadEnded (PThread &thread)
void	SetTerminationValue (int value)
int	GetTerminationValue () const
PArgList &	GetArguments ()
virtual const PString &	GetManufacturer () const
virtual const PString &	GetName () const
virtual PString	GetVersion (PBoolean full=PTrue) const
const PFilePath &	GetFile () const
DWORD	GetProcessID () const
PTime	GetStartTime () const
PString	GetUserName () const
PBoolean	SetUserName (const PString &username, PBoolean permanent=PFalse)
PString	GetGroupName () const
PBoolean	SetGroupName (const PString &groupname, PBoolean permanent=PFalse)
int	GetMaxHandles () const
PBoolean	SetMaxHandles (int newLimit)
void	SetConfigurationPath (const PString &path)
static PProcess &	Current ()
static PBoolean	IsInitialised ()
Public Member Functions
PTimerList *	GetTimerList ()
virtual int	_main (void *arg=NULL)
	Main function for process, called from real main after initialisation.
	~PProcess ()
PDirectory	PXGetHomeDir ()
char **	PXGetArgv () const
int	PXGetArgc () const
char **	PXGetEnvp () const
virtual void	PXOnSignal (int)
virtual void	PXOnAsyncSignal (int)
void	PXCheckSignals ()
void	PXAbortIOBlock (int fd)
Overrides from class PObject
Comparison	Compare (const PObject &obj) const
Overrides from class PThread
virtual void	Terminate ()
virtual PString	GetThreadName () const
virtual void	SetThreadName (const PString &name)
Static Public Member Functions
static void	PreInitialise (int argc, char **argv, char **envp)
static void	PreShutdown ()
static void	PostShutdown ()
static void	PXShowSystemWarning (PINDEX code)
static void	PXShowSystemWarning (PINDEX code, const PString &str)
Operating System information functions
static PString	GetOSClass ()
static PString	GetOSName ()
static PString	GetOSHardware ()
static PString	GetOSVersion ()
static PDirectory	GetOSConfigDir ()
Protected Member Functions
void	CommonConstruct ()
void	CommonDestruct ()
virtual void	_PXShowSystemWarning (PINDEX code, const PString &str)
void	CreateConfigFilesDictionary ()
Protected Attributes
int	pxSignals
PAbstractDictionary *	configFiles
PXFdDict	ioBlocks [3]
Friends
class	PThread
class	PApplication
class	PServiceProcess
class	PHouseKeepingThread
void	PXSignalHandler (int)
PString	PX_GetThreadName (pthread_t id)
void	PXSigHandler (int)
Classes
class	HostSystemURLHandlerInfo

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Detailed Description

This class represents an operating system process. This is a running "programme" in the context of the operating system. Note that there can only be one instance of a PProcess class in a given programme.

The instance of a PProcess or its GUI descendent PApplication# is usually a static variable created by the application writer. This is the initial "anchor" point for all data structures in an application. As the application writer never needs to access the standard system main()# function, it is in the library, the programmes execution begins with the virtual function PThread::Main()# on a process.

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Member Enumeration Documentation

enum PProcess::CodeStatus

Release status for the program.

Enumerator:

AlphaCode	Code is still very much under construction.
BetaCode	Code is largely complete and is under test.
ReleaseCode	Code has all known bugs removed and is shipping.
NumCodeStatuses

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Constructor & Destructor Documentation

PProcess::PProcess	(	const char *	manuf = "",
		const char *	name = "",
		WORD	majorVersion = 1,
		WORD	minorVersion = 0,
		CodeStatus	status = ReleaseCode,
		WORD	buildNumber = 1
	)

Create a new process instance.

Parameters:

manuf	Name of manufacturer
name	Name of product
majorVersion	Major version number of the product
minorVersion	Minor version number of the product
status	Development status of the product
buildNumber	Build number of the product

PProcess::~PProcess

(

)

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Member Function Documentation

Comparison PProcess::Compare

(

const PObject &

obj

)

const [virtual]

Compare two process instances. This should almost never be called as a programme only has access to a single process, its own.

Returns:

EqualTo# if the two process object have the same name.

Parameters:

obj	Other process to compare against.

Reimplemented from PObject.

virtual void PProcess::Terminate

(

)

[virtual]

Terminate the process. Usually only used in abnormal abort situation.

Reimplemented from PThread.

Reimplemented in PServiceProcess.

virtual PString PProcess::GetThreadName

(

)

const [virtual]

Get the name of the thread. Thread names are a optional debugging aid.

Returns:

current thread name.

Reimplemented from PThread.

virtual void PProcess::SetThreadName

(

const PString &

name

)

[virtual]

Change the name of the thread. Thread names are a optional debugging aid.

Returns:

current thread name.

Parameters:

name	New name for the thread.

Reimplemented from PThread.

static PProcess& PProcess::Current

(

)

[static]

Get the current processes object instance. The { current process} is the one the application is running in.

Returns:

pointer to current process instance.

Reimplemented from PThread.

Reimplemented in PServiceProcess, and PHTTPServiceProcess.

virtual void PProcess::OnThreadStart

(

PThread &

thread

)

[virtual]

Callback for when a thread is started by the PTLib system. Note this is called in the context of the new thread.

virtual void PProcess::OnThreadEnded

(

PThread &

thread

)

[virtual]

Callback for when a thread is ended if wqas started in the PTLib system. Note this is called in the context of the old thread.

static PBoolean PProcess::IsInitialised

(

)

[static]

Determine if the current processes object instance has been initialised. If this returns PTrue it is safe to use the PProcess::Current() function.

Returns:

PTrue if process class has been initialised.

PINLINE void PProcess::SetTerminationValue

(

int

value

)

Set the termination value for the process.

The termination value is an operating system dependent integer which indicates the processes termiantion value. It can be considered a "return value" for an entire programme.

Parameters:

value

Value to return a process termination status.

PINLINE int PProcess::GetTerminationValue

(

)

const

Get the termination value for the process.

The termination value is an operating system dependent integer which indicates the processes termiantion value. It can be considered a "return value" for an entire programme.

Returns:

integer termination value.

PINLINE PArgList & PProcess::GetArguments

(

)

Get the programme arguments. Programme arguments are a set of strings provided to the programme in a platform dependent manner.

Returns:

argument handling class instance.

PINLINE const PString & PProcess::GetManufacturer

(

)

const [virtual]

Get the name of the manufacturer of the software. This is used in the default "About" dialog box and for determining the location of the configuration information as used by the PConfig# class.

The default for this information is the empty string.

Returns:

string for the manufacturer name eg "Equivalence".

PINLINE const PString & PProcess::GetName

(

)

const [virtual]

Get the name of the process. This is used in the default "About" dialog box and for determining the location of the configuration information as used by the PConfig# class.

The default is the title part of the executable image file.

Returns:

string for the process name eg "MyApp".

virtual PString PProcess::GetVersion

(

PBoolean

full = PTrue

)

const [virtual]

Get the version of the software. This is used in the default "About" dialog box and for determining the location of the configuration information as used by the PConfig# class.

If the full# parameter is PTrue then a version string built from the major, minor, status and build veriosn codes is returned. If PFalse then only the major and minor versions are returned.

The default for this information is "1.0".

Returns:

string for the version eg "1.0b3".

Parameters:

full	PTrue for full version, PFalse for short version.

PINLINE const PFilePath & PProcess::GetFile

(

)

const

Get the processes executable image file path.

Returns:

file path for program.

DWORD PProcess::GetProcessID

(

)

const

Get the platform dependent process identifier for the process. This is an arbitrary (and unique) integer attached to a process by the operating system.

Returns:

Process ID for process.

PTime PProcess::GetStartTime

(

)

const

Return the time at which the program was started

PString PProcess::GetUserName

(

)

const

Get the effective user name of the owner of the process, eg "root" etc. This is a platform dependent string only provided by platforms that are multi-user. Note that some value may be returned as a "simulated" user. For example, in MS-DOS an environment variable

Returns:

user name of processes owner.

PBoolean PProcess::SetUserName	(	const PString &	username,
		PBoolean	permanent = PFalse
	)

Set the effective owner of the process. This is a platform dependent string only provided by platforms that are multi-user.

For unix systems if the username may consist exclusively of digits and there is no actual username consisting of that string then the numeric uid value is used. For example "0" is the superuser. For the rare occassions where the users name is the same as their uid, if the username field starts with a '#' then the numeric form is forced.

If an empty string is provided then original user that executed the process in the first place (the real user) is set as the effective user.

The permanent flag indicates that the user will not be able to simple change back to the original user as indicated above, ie for unix systems setuid() is used instead of seteuid(). This is not necessarily meaningful for all platforms.

Returns:

PTrue if processes owner changed. The most common reason for failure is that the process does not have the privilege to change the effective user.

Parameters:

username	New user name or uid
permanent	Flag for if effective or real user

PString PProcess::GetGroupName

(

)

const

Get the effective group name of the owner of the process, eg "root" etc. This is a platform dependent string only provided by platforms that are multi-user. Note that some value may be returned as a "simulated" user. For example, in MS-DOS an environment variable

Returns:

group name of processes owner.

PBoolean PProcess::SetGroupName	(	const PString &	groupname,
		PBoolean	permanent = PFalse
	)

Set the effective group of the process. This is a platform dependent string only provided by platforms that are multi-user.

For unix systems if the groupname may consist exclusively of digits and there is no actual groupname consisting of that string then the numeric uid value is used. For example "0" is the superuser. For the rare occassions where the groups name is the same as their uid, if the groupname field starts with a '#' then the numeric form is forced.

If an empty string is provided then original group that executed the process in the first place (the real group) is set as the effective group.

The permanent flag indicates that the group will not be able to simply change back to the original group as indicated above, ie for unix systems setgid() is used instead of setegid(). This is not necessarily meaningful for all platforms.

Returns:

PTrue if processes group changed. The most common reason for failure is that the process does not have the privilege to change the effective group.

Parameters:

groupname	New group name or gid
permanent	Flag for if effective or real group

PINLINE int PProcess::GetMaxHandles

(

)

const

Get the maximum file handle value for the process. For some platforms this is meaningless.

Returns:

user name of processes owner.

PBoolean PProcess::SetMaxHandles

(

int

newLimit

)

Set the maximum number of file handles for the process. For unix systems the user must be run with the approriate privileges before this function can set the value above the system limit.

For some platforms this is meaningless.

Returns:

PTrue if successfully set the maximum file hadles.

Parameters:

newLimit

New limit on file handles

void PProcess::SetConfigurationPath

(

const PString &

path

)

Set the default file or set of directories to search for use in PConfig. To find the .ini file for use in the default PConfig() instance, this explicit filename is used, or if it is a set of directories separated by either ':' or ';' characters, then the application base name postfixed with ".ini" is searched for through those directories.

The search is actually done when the GetConfigurationFile() is called, this function only sets the internal variable.

Note for Windows, a path beginning with "HKEY_LOCAL_MACHINE\\" or "HKEY_CURRENT_USER\\" will actually search teh system registry for the application base name only (no ".ini") in that folder of the registry.

Parameters:

path	Explicit file or set of directories

static PString PProcess::GetOSClass

(

)

[static]

Get the class of the operating system the process is running on, eg "unix".

Returns:

String for OS class.

static PString PProcess::GetOSName

(

)

[static]

Get the name of the operating system the process is running on, eg "Linux".

Returns:

String for OS name.

static PString PProcess::GetOSHardware

(

)

[static]

Get the hardware the process is running on, eg "sparc".

Returns:

String for OS name.

static PString PProcess::GetOSVersion

(

)

[static]

Get the version of the operating system the process is running on, eg "2.0.33".

Returns:

String for OS version.

static PDirectory PProcess::GetOSConfigDir

(

)

[static]

Get the configuration directory of the operating system the process is running on, eg "/etc" for Unix, "c:\windows" for Win95 or "c:\winnt\system32\drivers\etc" for NT.

Returns:

Directory for OS configuration files.

PINLINE PTimerList * PProcess::GetTimerList

(

)

Get the list of timers handled by the application. This is an internal function and should not need to be called by the user.

Returns:

list of timers.

static void PProcess::PreInitialise	(	int	argc,
		char **	argv,
		char **	envp
	)			[static]

Internal initialisation function called directly from _main()#. The user should never call this function.

static void PProcess::PreShutdown

(

)

[static]

Internal shutdown function called directly from the ~PProcess _main()#. The user should never call this function.

static void PProcess::PostShutdown

(

)

[static]

virtual int PProcess::_main

(

void *

arg = NULL

)

[virtual]

Main function for process, called from real main after initialisation.

Reimplemented in PServiceProcess.

PDirectory PProcess::PXGetHomeDir

(

)

char** PProcess::PXGetArgv

(

)

const [inline]

int PProcess::PXGetArgc

(

)

const [inline]

char** PProcess::PXGetEnvp

(

)

const [inline]

virtual void PProcess::PXOnSignal

(

int

)

[virtual]

Reimplemented in PServiceProcess.

virtual void PProcess::PXOnAsyncSignal

(

int

)

[virtual]

Reimplemented in PServiceProcess.

void PProcess::PXCheckSignals

(

)

static void PProcess::PXShowSystemWarning

(

PINDEX

code

)

[static]

static void PProcess::PXShowSystemWarning	(	PINDEX	code,
		const PString &	str
	)			[static]

void PProcess::CommonConstruct

(

)

[protected]

void PProcess::CommonDestruct

(

)

[protected]

virtual void PProcess::_PXShowSystemWarning	(	PINDEX	code,
		const PString &	str
	)			[protected, virtual]

Reimplemented in PServiceProcess.

void PProcess::CreateConfigFilesDictionary

(

)

[protected]

void PProcess::PXAbortIOBlock

(

int

fd

)

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Friends And Related Function Documentation

friend class PThread [friend]

friend class PApplication [friend]

friend class PServiceProcess [friend]

friend class PHouseKeepingThread [friend]

void PXSignalHandler

(

int

)

[friend]

PString PX_GetThreadName

(

pthread_t

id

)

[friend]

void PXSigHandler

(

int

)

[friend]

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Member Data Documentation

int PProcess::pxSignals [protected]

PAbstractDictionary* PProcess::configFiles [protected]

PXFdDict PProcess::ioBlocks[3] [protected]

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

• pprocess.h
• osutil.inl

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