#include <util/system.h>
#include <boost/process.hpp>
#include <chainparamsbase.h>
#include <sync.h>
#include <util/check.h>
#include <util/getuniquepath.h>
#include <util/strencodings.h>
#include <util/string.h>
#include <util/translation.h>
#include <algorithm>
#include <cassert>
#include <fcntl.h>
#include <sched.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <boost/algorithm/string/replace.hpp>
#include <thread>
#include <typeinfo>
#include <univalue.h>

Include dependency graph for system.cpp:

Namespaces
	util

Functions
static std::map< std::string, std::unique_ptr< fsbridge::FileLock > > dir_locks	GUARDED_BY (cs_dir_locks)
	A map that contains all the currently held directory locks. More...

bool	LockDirectory (const fs::path &directory, const std::string lockfile_name, bool probe_only)

void	UnlockDirectory (const fs::path &directory, const std::string &lockfile_name)

void	ReleaseDirectoryLocks ()
	Release all directory locks. More...

bool	DirIsWritable (const fs::path &directory)

bool	CheckDiskSpace (const fs::path &dir, uint64_t additional_bytes)

std::streampos	GetFileSize (const char *path, std::streamsize max)
	Get the size of a file by scanning it. More...

static bool	InterpretBool (const std::string &strValue)
	Interpret a string argument as a boolean. More...

static std::string	SettingName (const std::string &arg)

static util::SettingsValue	InterpretOption (std::string &section, std::string &key, const std::string &value)
	Interpret -nofoo as if the user supplied -foo=0. More...

static bool	CheckValid (const std::string &key, const util::SettingsValue &val, unsigned int flags, std::string &error)
	Check settings value validity according to flags. More...

static void	SaveErrors (const std::vector< std::string > errors, std::vector< std::string > *error_out)

bool	HelpRequested (const ArgsManager &args)

void	SetupHelpOptions (ArgsManager &args)
	Add help options to the args manager. More...

std::string	HelpMessageGroup (const std::string &message)
	Format a string to be used as group of options in help messages. More...

std::string	HelpMessageOpt (const std::string &option, const std::string &message)
	Format a string to be used as option description in help messages. More...

static std::string	FormatException (const std::exception pex, const char pszThread)

void	PrintExceptionContinue (const std::exception pex, const char pszThread)

fs::path	GetDefaultDataDir ()

bool	CheckDataDirOption ()

fs::path	GetConfigFile (const std::string &confPath)

static bool	GetConfigOptions (std::istream &stream, const std::string &filepath, std::string &error, std::vector< std::pair< std::string, std::string >> &options, std::list< SectionInfo > &sections)

bool	RenameOver (fs::path src, fs::path dest)

bool	TryCreateDirectories (const fs::path &p)
	Ignores exceptions thrown by Boost's create_directories if the requested directory exists. More...

bool	FileCommit (FILE *file)
	Ensure file contents are fully committed to disk, using a platform-specific feature analogous to fsync(). More...

void	DirectoryCommit (const fs::path &dirname)
	Sync directory contents. More...

bool	TruncateFile (FILE *file, unsigned int length)

int	RaiseFileDescriptorLimit (int nMinFD)
	this function tries to raise the file descriptor limit to the requested number. More...

void	AllocateFileRange (FILE *file, unsigned int offset, unsigned int length)
	this function tries to make a particular range of a file allocated (corresponding to disk space) it is advisory, and the range specified in the arguments will never contain live data More...

std::string	ShellEscape (const std::string &arg)

UniValue	RunCommandParseJSON (const std::string &str_command, const std::string &str_std_in)
	Execute a command which returns JSON, and parse the result. More...

void	SetupEnvironment ()

bool	SetupNetworking ()

int	GetNumCores ()
	Return the number of cores available on the current system. More...

std::string	CopyrightHolders (const std::string &strPrefix)

int64_t	GetStartupTime ()

fs::path	AbsPathForConfigVal (const fs::path &path, bool net_specific)
	Most paths passed as configuration arguments are treated as relative to the datadir if they are not absolute. More...

void	ScheduleBatchPriority ()
	On platforms that support it, tell the kernel the calling thread is CPU-intensive and non-interactive. More...

Variables
const int64_t	nStartupTime = GetTime()

const char *const	BITCOIN_CONF_FILENAME = "bitcoin.conf"

const char *const	BITCOIN_SETTINGS_FILENAME = "settings.json"

ArgsManager	gArgs

static Mutex	cs_dir_locks
	Mutex to protect dir_locks. More...

static const int	screenWidth = 79

static const int	optIndent = 2

static const int	msgIndent = 7

Function Documentation

◆ AbsPathForConfigVal()

fs::path AbsPathForConfigVal	(	const fs::path &	path,
		bool	net_specific = `true`
	)

Most paths passed as configuration arguments are treated as relative to the datadir if they are not absolute.

Parameters

path	The path to be conditionally prefixed with datadir.
net_specific	Use network specific datadir variant

Returns: The normalized path.

Definition at line 1367 of file system.cpp.

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◆ AllocateFileRange()

void AllocateFileRange	(	FILE *	file,
		unsigned int	offset,
		unsigned int	length
	)

this function tries to make a particular range of a file allocated (corresponding to disk space) it is advisory, and the range specified in the arguments will never contain live data

Definition at line 1171 of file system.cpp.

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◆ CheckDataDirOption()

bool CheckDataDirOption ( )

Definition at line 811 of file system.cpp.

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◆ CheckDiskSpace()

bool CheckDiskSpace	(	const fs::path &	dir,
		uint64_t	additional_bytes
	)

Definition at line 144 of file system.cpp.

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◆ CheckValid()

static bool CheckValid	(	const std::string &	key,
		const util::SettingsValue &	val,
		unsigned int	flags,
		std::string &	error
	)

static

Check settings value validity according to flags.

TODO: Add more meaningful error checks here in the future See "here's how the flags are meant to behave" in https://github.com/bitcoin/bitcoin/pull/16097#issuecomment-514627823

Definition at line 234 of file system.cpp.

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◆ CopyrightHolders()

std::string CopyrightHolders ( const std::string & strPrefix )

Definition at line 1349 of file system.cpp.

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◆ DirectoryCommit()

void DirectoryCommit ( const fs::path & dirname )

Sync directory contents.

This is required on some environments to ensure that newly created files are committed to disk.

Definition at line 1125 of file system.cpp.

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◆ DirIsWritable()

bool DirIsWritable ( const fs::path & directory )

Definition at line 131 of file system.cpp.

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◆ FileCommit()

bool FileCommit ( FILE * file )

Ensure file contents are fully committed to disk, using a platform-specific feature analogous to fsync().

Definition at line 1094 of file system.cpp.

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◆ FormatException()

static std::string FormatException	(	const std::exception *	pex,
		const char *	pszThread
	)

static

Definition at line 763 of file system.cpp.

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◆ GetConfigFile()

fs::path GetConfigFile ( const std::string & confPath )

Definition at line 817 of file system.cpp.

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◆ GetConfigOptions()

static bool GetConfigOptions	(	std::istream &	stream,
		const std::string &	filepath,
		std::string &	error,
		std::vector< std::pair< std::string, std::string >> &	options,
		std::list< SectionInfo > &	sections
	)

static

Definition at line 822 of file system.cpp.

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◆ GetDefaultDataDir()

fs::path GetDefaultDataDir ( )

Definition at line 786 of file system.cpp.

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◆ GetFileSize()

std::streampos GetFileSize	(	const char *	path,
		std::streamsize	max = `std::numeric_limits< std::streamsize >::max()`
	)

Get the size of a file by scanning it.

Parameters

[in]	path	The file path
[in]	max	Stop seeking beyond this limit

Returns: The file size or max

Definition at line 152 of file system.cpp.

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◆ GetNumCores()

int GetNumCores ( )

Return the number of cores available on the current system.

Note: This does count virtual cores, such as those provided by HyperThreading.

Definition at line 1344 of file system.cpp.

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◆ GetStartupTime()

int64_t GetStartupTime ( )

Definition at line 1362 of file system.cpp.

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◆ GUARDED_BY()

static std::map<std::string, std::unique_ptr<fsbridge::FileLock> > dir_locks GUARDED_BY ( cs_dir_locks )

static

A map that contains all the currently held directory locks.

After successful locking, these will be held here until the global destructor cleans them up and thus automatically unlocks them, or ReleaseDirectoryLocks is called.

◆ HelpMessageGroup()

std::string HelpMessageGroup ( const std::string & message )

Format a string to be used as group of options in help messages.

Parameters

message Group name (e.g. "RPC server options:")

Returns: the formatted string

Definition at line 752 of file system.cpp.

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◆ HelpMessageOpt()

std::string HelpMessageOpt	(	const std::string &	option,
		const std::string &	message
	)

Format a string to be used as option description in help messages.

Parameters

option	Option message (e.g. "-rpcuser=<user>")
message	Option description (e.g. "Username for JSON-RPC connections")

Returns: the formatted string

Definition at line 756 of file system.cpp.

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◆ HelpRequested()

bool HelpRequested ( const ArgsManager & args )

Returns: true if help has been requested via a command-line arg

Definition at line 737 of file system.cpp.

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◆ InterpretBool()

static bool InterpretBool ( const std::string & strValue )

static

Interpret a string argument as a boolean.

The definition of atoi() requires that non-numeric string values like "foo", return 0. This means that if a user unintentionally supplies a non-integer argument here, the return value is always false. This means that -foo=false does what the user probably expects, but -foo=true is well defined but does not do what they probably expected.

The return value of atoi() is undefined when given input not representable as an int. On most systems this means string value between "-2147483648" and "2147483647" are well defined (this method will return true). Setting -txindex=2147483648 on most systems, however, is probably undefined.

For a more extensive discussion of this topic (and a wide range of opinions on the Right Way to change this code), see PR12713.

Definition at line 175 of file system.cpp.

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◆ InterpretOption()

static util::SettingsValue InterpretOption	(	std::string &	section,
		std::string &	key,
		const std::string &	value
	)

static

Interpret -nofoo as if the user supplied -foo=0.

This method also tracks when the -no form was supplied, and if so, checks whether there was a double-negative (-nofoo=0 -> -foo=1).

If there was not a double negative, it removes the "no" from the key and returns false.

If there was a double negative, it removes "no" from the key, and returns true.

If there was no "no", it returns the string value untouched.

Where an option was negated can be later checked using the IsArgNegated() method. One use case for this is to have a way to disable options that are not normally boolean (e.g. using -nodebuglogfile to request that debug log output is not sent to any file at all).

Definition at line 207 of file system.cpp.

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◆ LockDirectory()

bool LockDirectory	(	const fs::path &	directory,
		const std::string	lockfile_name,
		bool	probe_only
	)

Definition at line 95 of file system.cpp.

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◆ PrintExceptionContinue()

void PrintExceptionContinue	(	const std::exception *	pex,
		const char *	pszThread
	)

Definition at line 779 of file system.cpp.

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◆ RaiseFileDescriptorLimit()

int RaiseFileDescriptorLimit ( int nMinFD )

this function tries to raise the file descriptor limit to the requested number.

It returns the actual file descriptor limit (which may be more or less than nMinFD)

Definition at line 1148 of file system.cpp.

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◆ ReleaseDirectoryLocks()

void ReleaseDirectoryLocks ( )

Release all directory locks.

This is used for unit testing only, at runtime the global destructor will take care of the locks.

Definition at line 125 of file system.cpp.

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◆ RenameOver()

bool RenameOver	(	fs::path	src,
		fs::path	dest
	)

Definition at line 1064 of file system.cpp.

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◆ RunCommandParseJSON()

UniValue RunCommandParseJSON	(	const std::string &	str_command,
		const std::string &	str_std_in = `""`
	)

Execute a command which returns JSON, and parse the result.

Parameters

str_command	The command to execute, including any arguments
str_std_in	string to pass to stdin

Returns: parsed JSON

Definition at line 1256 of file system.cpp.

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◆ SaveErrors()

static void SaveErrors	(	const std::vector< std::string >	errors,
		std::vector< std::string > *	error_out
	)

static

Definition at line 527 of file system.cpp.

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◆ ScheduleBatchPriority()

void ScheduleBatchPriority ( )

On platforms that support it, tell the kernel the calling thread is CPU-intensive and non-interactive.

See SCHED_BATCH in sched(7) for details.

Definition at line 1375 of file system.cpp.

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◆ SettingName()

static std::string SettingName ( const std::string & arg )

static

Definition at line 182 of file system.cpp.

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◆ SetupEnvironment()

void SetupEnvironment ( )

Definition at line 1295 of file system.cpp.

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◆ SetupHelpOptions()

void SetupHelpOptions ( ArgsManager & args )

Add help options to the args manager.

Definition at line 742 of file system.cpp.

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◆ SetupNetworking()

bool SetupNetworking ( )

Definition at line 1332 of file system.cpp.

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◆ ShellEscape()

std::string ShellEscape ( const std::string & arg )

Definition at line 1234 of file system.cpp.

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◆ TruncateFile()

bool TruncateFile	(	FILE *	file,
		unsigned int	length
	)

Definition at line 1136 of file system.cpp.

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◆ TryCreateDirectories()

bool TryCreateDirectories ( const fs::path & p )

Ignores exceptions thrown by Boost's create_directories if the requested directory exists.

Specifically handles case where path p exists, but it wasn't possible for the user to write to the parent directory.

Definition at line 1080 of file system.cpp.

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◆ UnlockDirectory()

void UnlockDirectory	(	const fs::path &	directory,
		const std::string &	lockfile_name
	)

Definition at line 119 of file system.cpp.

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Variable Documentation

◆ BITCOIN_CONF_FILENAME

const char* const BITCOIN_CONF_FILENAME = "bitcoin.conf"

Definition at line 81 of file system.cpp.

◆ BITCOIN_SETTINGS_FILENAME

const char* const BITCOIN_SETTINGS_FILENAME = "settings.json"

Definition at line 82 of file system.cpp.

◆ cs_dir_locks

Mutex cs_dir_locks

static

Mutex to protect dir_locks.

Definition at line 87 of file system.cpp.

◆ gArgs

ArgsManager gArgs

Definition at line 84 of file system.cpp.

◆ msgIndent

const int msgIndent = 7

static

Definition at line 750 of file system.cpp.

◆ nStartupTime

const int64_t nStartupTime = GetTime()

Definition at line 79 of file system.cpp.

◆ optIndent

const int optIndent = 2

static

Definition at line 749 of file system.cpp.

◆ screenWidth

const int screenWidth = 79

static

Definition at line 748 of file system.cpp.

Namespaces

Functions

Variables

Function Documentation

◆ AbsPathForConfigVal()

◆ AllocateFileRange()

◆ CheckDataDirOption()

◆ CheckDiskSpace()

◆ CheckValid()

◆ CopyrightHolders()

◆ DirectoryCommit()

◆ DirIsWritable()

◆ FileCommit()

◆ FormatException()

◆ GetConfigFile()

◆ GetConfigOptions()

◆ GetDefaultDataDir()

◆ GetFileSize()

◆ GetNumCores()

◆ GetStartupTime()

◆ GUARDED_BY()

◆ HelpMessageGroup()

◆ HelpMessageOpt()

◆ HelpRequested()

◆ InterpretBool()

◆ InterpretOption()

◆ LockDirectory()

◆ PrintExceptionContinue()

◆ RaiseFileDescriptorLimit()

◆ ReleaseDirectoryLocks()

◆ RenameOver()

◆ RunCommandParseJSON()

◆ SaveErrors()

◆ ScheduleBatchPriority()

◆ SettingName()

◆ SetupEnvironment()

◆ SetupHelpOptions()

◆ SetupNetworking()

◆ ShellEscape()

◆ TruncateFile()

◆ TryCreateDirectories()

◆ UnlockDirectory()

Variable Documentation

◆ BITCOIN_CONF_FILENAME

◆ BITCOIN_SETTINGS_FILENAME

◆ cs_dir_locks

◆ gArgs

◆ msgIndent

◆ nStartupTime

◆ optIndent

◆ screenWidth