Encapsulate OS-specific functions to manipulate file and directory paths. More...

Collaboration diagram for Host Filesystem:

Files
file	system-path-examples.cc
	Example program illustrating use of ns3::SystemPath.

file	system-path.cc
	ns3::SystemPath implementation.

file	system-path.h
	ns3::SystemPath declarations.

Namespaces
	ns3::SystemPath
	Namespace for various file and directory path functions.

Functions
std::string	ns3::SystemPath::Append (std::string left, std::string right)
	Join two file system path elements. More...

std::string	ns3::SystemPath::Dirname (std::string path)
	Get the directory path for a file. More...

bool	ns3::SystemPath::Exists (const std::string path)
	Check if a path exists. More...

std::string	ns3::SystemPath::FindSelfDirectory (void)
	Get the file system path to the current executable. More...

std::string	ns3::SystemPath::Join (std::list< std::string >::const_iterator begin, std::list< std::string >::const_iterator end)
	Join a list of file system path directories into a single file system path. More...

void	ns3::SystemPath::MakeDirectories (std::string path)
	Create all the directories leading to path. More...

std::string	ns3::SystemPath::MakeTemporaryDirectoryName (void)
	Get the name of a temporary directory. More...

std::list< std::string >	ns3::SystemPath::ReadFiles (std::string path)
	Get the list of files located in a file system directory. More...

std::tuple< std::list< std::string >, bool >	ns3::anonymous_namespace{system-path.cc}::ReadFilesNoThrow (std::string path)
	Get the list of files located in a file system directory with error. More...

std::list< std::string >	ns3::SystemPath::Split (std::string path)
	Split a file system path into directories according to the local path separator. More...

Detailed Description

Encapsulate OS-specific functions to manipulate file and directory paths.

The functions provided here are used mostly to implement the ns-3 test framework.

Function Documentation

◆ Append()

std::string ns3::SystemPath::Append	(	std::string	left,
		std::string	right
	)

Join two file system path elements.

Parameters

[in]	left	A path element
[in]	right	A path element

Returns: A concatenation of the two input paths

Definition at line 241 of file system-path.cc.

References NS_LOG_FUNCTION, and SYSTEM_PATH_SEP.

Referenced by ns3::TestCase::CreateDataDirFilename(), ns3::TestCase::CreateTempDirFilename(), ns3::DesMetrics::Initialize(), and ns3::CommandLine::PrintDoxygenUsage().

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◆ Dirname()

std::string ns3::SystemPath::Dirname ( std::string path )

Get the directory path for a file.

This is an internal function (by virtue of not being declared in a .h file); the public API is FindSelfDirectory().

Parameters

[in] path The full path to a file.

Returns: The full path to the containing directory.

Definition at line 141 of file system-path.cc.

References ns3::SystemPath::Join(), NS_LOG_FUNCTION, and ns3::SystemPath::Split().

Referenced by ns3::SystemPath::Exists(), and ns3::SystemPath::FindSelfDirectory().

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◆ Exists()

bool ns3::SystemPath::Exists ( const std::string path )

Check if a path exists.

Path can be a file or directory.

Parameters

[in] path The path to check.

Returns: true if the path exists.

Definition at line 393 of file system-path.cc.

References ns3::SystemPath::Dirname(), create-module::file, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::SystemPath::ReadFiles(), ns3::anonymous_namespace{system-path.cc}::ReadFilesNoThrow(), and ns3::SystemPath::Split().

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◆ FindSelfDirectory()

std::string ns3::SystemPath::FindSelfDirectory ( void )

Get the file system path to the current executable.

Returns: The directory in which the currently-executing binary is located

This function returns the path to the running $PREFIX. Mac OS X: _NSGetExecutablePath() (man 3 dyld) Linux: readlink /proc/self/exe Solaris: getexecname() FreeBSD: sysctl CTL_KERN KERN_PROC KERN_PROC_PATHNAME -1 BSD with procfs: readlink /proc/curproc/file Windows: GetModuleFileName() with hModule = NULL

Definition at line 150 of file system-path.cc.

References ns3::SystemPath::Dirname(), NS_ASSERT, NS_FATAL_ERROR, and NS_LOG_FUNCTION_NOARGS.

Referenced by ns3::TestRunnerImpl::GetTopLevelSourceDir().

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◆ Join()

std::string ns3::SystemPath::Join	(	std::list< std::string >::const_iterator	begin,
		std::list< std::string >::const_iterator	end
	)

Join a list of file system path directories into a single file system path.

This is the inverse of Split.

Parameters

[in]	begin	Iterator to first element to join
[in]	end	Iterator to one past the last element to join

Returns: A path that is a concatenation of all the input elements.

Definition at line 276 of file system-path.cc.

References NS_LOG_FUNCTION, and SYSTEM_PATH_SEP.

Referenced by ns3::TestCase::CreateTempDirFilename(), ns3::SystemPath::Dirname(), ns3::TestRunnerImpl::GetTopLevelSourceDir(), and ns3::SystemPath::MakeDirectories().

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◆ MakeDirectories()

void ns3::SystemPath::MakeDirectories ( std::string path )

Create all the directories leading to path.

Parameters

[in] path A path to a directory

Definition at line 361 of file system-path.cc.

References ns3::SystemPath::Join(), NS_LOG_ERROR, NS_LOG_FUNCTION, NS_LOG_LOGIC, and ns3::SystemPath::Split().

Referenced by ns3::TestCase::CreateTempDirFilename().

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◆ MakeTemporaryDirectoryName()

std::string ns3::SystemPath::MakeTemporaryDirectoryName ( void )

Get the name of a temporary directory.

The returned path identifies a directory which does not exist yet. Call ns3::SystemPath::MakeDirectories to create it. Yes, there is a well-known security race in this API but we don't care in ns-3.

The final path to the directory is going to look something like

/tmp/ns3.14.30.29.32767

The first part, "/tmp/" is the absolute path found by inspecting the environment variables TMPand TEMP, in order. If neither exists the hard-codes root path /tmp/ is used.

The directory name itself starts with the "ns3" identifier telling folks who is making all of the temp directories.

The next three number give the hour, minute and second, separated by periods.

The final number is randomly generated, to avoid name collisions.