Konsole::ProcessInfo Class Reference

#include <ProcessInfo.h>

Inheritance diagram for Konsole::ProcessInfo:

Public Types
enum	Error { NoError , UnknownError , PermissionsError }
enum	Field {   PROCESS_ID = 1 , PARENT_PID = 2 , FOREGROUND_PID = 4 , ARGUMENTS = 8 ,   ENVIRONMENT = 16 , NAME = 32 , CURRENT_DIR = 64 , UID = 128 }
typedef QFlags< Field >	Fields

Public Member Functions
QVector< QString >	arguments (bool *ok) const
QString	currentDir (bool *ok) const
QMap< QString, QString >	environment (bool *ok) const
Error	error () const
int	foregroundPid (bool *ok) const
QString	format (const QString &text) const
bool	isValid () const
QString	name (bool *ok) const
int	parentPid (bool *ok) const
int	pid (bool *ok) const
void	setUserHomeDir ()
void	update ()
QString	userHomeDir () const
int	userId (bool *ok) const
QString	userName () const
QString	validCurrentDir () const

Static Public Member Functions
static QString	localHost ()
static std::unique_ptr< ProcessInfo >	newInstance (int pid, bool readEnvironment=false)

Protected Member Functions
	ProcessInfo (int pid, bool readEnvironment=false)
void	addArgument (const QString &argument)
void	addEnvironmentBinding (const QString &name, const QString &value)
void	clearArguments ()
virtual bool	readProcessInfo (int pid, bool readEnvironment)=0
virtual void	readUserName (void)=0
void	setCurrentDir (const QString &dir)
void	setError (Error error)
void	setFileError (QFile::FileError error)
void	setForegroundPid (int pid)
void	setName (const QString &name)
void	setParentPid (int pid)
void	setPid (int pid)
void	setUserId (int uid)
void	setUserName (const QString &name)

Detailed Description

Takes a snapshot of the state of a process and provides access to information such as the process name, parent process, the foreground process in the controlling terminal, the arguments with which the process was started and the environment.

To create a new snapshot, construct a new ProcessInfo instance, using ProcessInfo::newInstance(), passing the process identifier of the process you are interested in.

After creating a new instance, call the update() method to take a snapshot of the current state of the process.

Before calling any additional methods, check that the process state was read successfully using the isValid() method.

Each accessor method which provides information about the process state ( such as pid(), currentDir(), name() ) takes a pointer to a boolean as an argument. If the information requested was read successfully then the boolean is set to true, otherwise it is set to false, in which case the return value from the function should be ignored. If this boolean is set to false, it may indicate an error reading the process information, or it may indicate that the information is not available on the current platform.

eg.

ProcessInfo* info = ProcessInfo::newInstance(pid);
info->update();
 
if ( info->isValid() )
{
   bool ok;
 
   QString name = info->name(&ok);
   if ( ok ) qDebug() << "process name - " << name;
   int parentPid = info->parentPid(&ok);
   if ( ok ) qDebug() << "parent process - " << parentPid;
   int foregroundPid = info->foregroundPid(&ok);
   if ( ok ) qDebug() << "foreground process - " << foregroundPid;
}

Definition at line 74 of file ProcessInfo.h.

Member Typedef Documentation

Fields

typedef QFlags< Field > Konsole::ProcessInfo::Fields

Definition at line 214 of file ProcessInfo.h.

Member Enumeration Documentation

Error

enum Konsole::ProcessInfo::Error

This enum describes the errors which can occur when trying to read a process's information.

Enumerator
NoError	No error occurred.
UnknownError	The nature of the error is unknown.
PermissionsError	Konsole does not have permission to obtain the process information.

Definition at line 199 of file ProcessInfo.h.

Field

enum Konsole::ProcessInfo::Field

Definition at line 213 of file ProcessInfo.h.

Constructor & Destructor Documentation

~ProcessInfo()

virtual Konsole::ProcessInfo::~ProcessInfo ( )

inlinevirtual

Definition at line 90 of file ProcessInfo.h.

ProcessInfo()

ProcessInfo::ProcessInfo ( int pid, bool readEnvironment = false )

explicitprotected

Constructs a new process instance.

You should not call the constructor of ProcessInfo or its subclasses directly. Instead use the static ProcessInfo::newInstance() method which will return a suitable ProcessInfo instance for the current platform.

Definition at line 60 of file ProcessInfo.cpp.

Member Function Documentation

addArgument()

void ProcessInfo::addArgument ( const QString & argument )

protected

Adds a commandline argument for the process, as returned by arguments()

Definition at line 305 of file ProcessInfo.cpp.

addEnvironmentBinding()

void ProcessInfo::addEnvironmentBinding ( const QString & name, const QString & value )

protected

Adds an environment binding for the process, as returned by environment()

Parameters

name	The name of the environment variable, eg. "PATH"
value	The value of the environment variable, eg. "/bin"

Definition at line 315 of file ProcessInfo.cpp.

arguments()

QVector< QString > ProcessInfo::arguments

(

bool *

ok

)

const

Returns the command-line arguments which the process was started with.

The first argument is the name used to launch the process.

Parameters

ok	Set to true if the arguments were read successfully or false otherwise.

Definition at line 184 of file ProcessInfo.cpp.

clearArguments()

void ProcessInfo::clearArguments ( )

protected

clear the commandline arguments for the process, as returned by arguments()

Definition at line 310 of file ProcessInfo.cpp.

currentDir()

QString ProcessInfo::currentDir

(

bool *

ok

)

const

Returns the current working directory of the process.

Parameters

ok	Set to true if the current working directory was read successfully or false otherwise

Definition at line 287 of file ProcessInfo.cpp.

environment()

QMap< QString, QString > ProcessInfo::environment

(

bool *

ok

)

const

Returns the environment bindings which the process was started with.

In the returned map, the key is the name of the environment variable, and the value is the corresponding value.

Parameters

ok	Set to true if the environment bindings were read successfully or false otherwise

Definition at line 191 of file ProcessInfo.cpp.

error()

ProcessInfo::Error ProcessInfo::error

(

)

const

Returns the last error which occurred.

Definition at line 79 of file ProcessInfo.cpp.

foregroundPid()

int ProcessInfo::foregroundPid

(

bool *

ok

)

const

Returns the id of the current foreground process.

NOTE: Using the foregroundProcessGroup() method of the Pty instance associated with the terminal of interest is preferred over using this method.

Parameters

ok	Set to true if the foreground process id was read successfully or false otherwise

Definition at line 217 of file ProcessInfo.cpp.

format()

QString ProcessInfo::format

(

const QString &

text

)

const

Parses an input string, looking for markers beginning with a '' character and returns a string with the markers replaced with information from this process description.

The markers recognized are:

• u - Name of the user which owns the process.
• n - Replaced with the name of the process.

• d - Replaced with the last part of the path name of the process' current working directory.

  (eg. if the current directory is '/home/bob' then 'bob' would be returned)

• D - Replaced with the current working directory of the process.

Definition at line 111 of file ProcessInfo.cpp.

isValid()

bool ProcessInfo::isValid

(

)

const

Returns true if the process state was read successfully.

Definition at line 198 of file ProcessInfo.cpp.

localHost()

QString ProcessInfo::localHost ( )

static

Returns the local host.

Definition at line 248 of file ProcessInfo.cpp.

name()

QString ProcessInfo::name

(

bool *

ok

)

const

Returns the name of the current process.

Definition at line 224 of file ProcessInfo.cpp.

newInstance()

std::unique_ptr< ProcessInfo > ProcessInfo::newInstance ( int pid, bool readEnvironment = false )

static

Constructs a new instance of a suitable ProcessInfo sub-class for the current platform which provides information about a given process.

Parameters

pid	The pid of the process to examine
readEnvironment	Specifies whether environment bindings should be read. If this is false, then environment() calls will always fail. This is an optimization to avoid the overhead of reading the (potentially large) environment data when it is not required.

Definition at line 1182 of file ProcessInfo.cpp.

parentPid()

int ProcessInfo::parentPid

(

bool *

ok

)

const

Returns the id of the parent process id was read successfully or false otherwise.

Parameters

ok	Set to true if the parent process id

Definition at line 210 of file ProcessInfo.cpp.

pid()

int ProcessInfo::pid

(

bool *

ok

)

const

Returns the process id.

Parameters

ok	Set to true if the process id was read successfully or false otherwise

Definition at line 203 of file ProcessInfo.cpp.

readProcessInfo()

virtual bool Konsole::ProcessInfo::readProcessInfo ( int pid, bool readEnvironment )

protectedpure virtual

This is called on construction to read the process state Subclasses should reimplement this function to provide platform-specific process state reading functionality.

When called, readProcessInfo() should attempt to read all of the necessary state information. If the attempt is successful, it should set the process id using setPid(), and update the other relevant information using setParentPid(), setName(), setArguments() etc.

Calls to isValid() will return true only if the process id has been set using setPid()

Parameters

pid	The process id of the process to read
readEnvironment	Specifies whether the environment bindings for the process should be read

Implemented in Konsole::NullProcessInfo, and Konsole::UnixProcessInfo.

setCurrentDir()

void ProcessInfo::setCurrentDir ( const QString & dir )

protected

Sets the current working directory for the process.

Definition at line 294 of file ProcessInfo.cpp.

setError()

void ProcessInfo::setError ( Error error )

protected

Sets the error.

Definition at line 83 of file ProcessInfo.cpp.

setFileError()

void ProcessInfo::setFileError ( QFile::FileError error )

protected

Convenience method.

Sets the error based on a QFile error code.

Definition at line 320 of file ProcessInfo.cpp.

setForegroundPid()

void ProcessInfo::setForegroundPid ( int pid )

protected

Sets the foreground process id as returned by foregroundPid()

Definition at line 281 of file ProcessInfo.cpp.

setName()

void ProcessInfo::setName ( const QString & name )

protected

Sets the name of the process as returned by name()

Definition at line 300 of file ProcessInfo.cpp.

setParentPid()

void ProcessInfo::setParentPid ( int pid )

protected

Sets the parent process id as returned by parentPid()

Definition at line 276 of file ProcessInfo.cpp.

setPid()

void ProcessInfo::setPid ( int pid )

protected

Sets the process id associated with this ProcessInfo instance.

Definition at line 253 of file ProcessInfo.cpp.

setUserHomeDir()

void ProcessInfo::setUserHomeDir

(

)

Forces the user home directory to be calculated.

Definition at line 271 of file ProcessInfo.cpp.

setUserId()

void ProcessInfo::setUserId ( int uid )

protected

Sets the user id associated with this ProcessInfo instance.

Definition at line 259 of file ProcessInfo.cpp.

setUserName()

void ProcessInfo::setUserName ( const QString & name )

protected

Sets the user name of the process as set by readUserName()

Definition at line 265 of file ProcessInfo.cpp.

update()

void ProcessInfo::update

(

)

Updates the information about the process.

This must be called before attempting to use any of the accessor methods.

Definition at line 88 of file ProcessInfo.cpp.

userHomeDir()

QString ProcessInfo::userHomeDir

(

)

const

Returns the user's home directory of the process.

Definition at line 243 of file ProcessInfo.cpp.

userId()

int ProcessInfo::userId

(

bool *

ok

)

const

Definition at line 231 of file ProcessInfo.cpp.

userName()

QString ProcessInfo::userName

(

)

const

Returns the user's name of the process.

Definition at line 238 of file ProcessInfo.cpp.

validCurrentDir()

QString ProcessInfo::validCurrentDir

(

)

const

Returns the current working directory of the process (or its parent)

Definition at line 93 of file ProcessInfo.cpp.

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

• ProcessInfo.h
• ProcessInfo.cpp