A collection of legacy interfaces for querying information about the current executing process. More...

#include "llvm/Support/Process.h"

Public Types
using	Pid = int32_t

Static Public Member Functions
static Pid	getProcessId ()
	Get the process's identifier.

static Expected< unsigned >	getPageSize ()
	Get the process's page size.

static unsigned	getPageSizeEstimate ()
	Get the process's estimated page size.

static size_t	GetMallocUsage ()
	Return process memory usage.

static void	GetTimeUsage (TimePoint<> &elapsed, std::chrono::nanoseconds &user_time, std::chrono::nanoseconds &sys_time)
	This static function will set `user_time` to the amount of CPU time spent in user (non-kernel) mode and `sys_time` to the amount of CPU time spent in system (kernel) mode.

static void	PreventCoreFiles ()
	This function makes the necessary calls to the operating system to prevent core files or any other kind of large memory dumps that can occur when a program fails.

static bool	AreCoreFilesPrevented ()
	true if PreventCoreFiles has been called, false otherwise.

static std::optional< std::string >	GetEnv (StringRef name)

static std::optional< std::string >	FindInEnvPath (StringRef EnvName, StringRef FileName, ArrayRef< std::string > IgnoreList, char Separator=EnvPathSeparator)
	This function searches for an existing file in the list of directories in a PATH like environment variable, and returns the first file found, according to the order of the entries in the PATH like environment variable.

static std::optional< std::string >	FindInEnvPath (StringRef EnvName, StringRef FileName, char Separator=EnvPathSeparator)

static std::error_code	FixupStandardFileDescriptors ()

static std::error_code	SafelyCloseFileDescriptor (int FD)

static bool	StandardInIsUserInput ()
	This function determines if the standard input is connected directly to a user's input (keyboard probably), rather than coming from a file or pipe.

static bool	StandardOutIsDisplayed ()
	This function determines if the standard output is connected to a "tty" or "console" window.

static bool	StandardErrIsDisplayed ()
	This function determines if the standard error is connected to a "tty" or "console" window.

static bool	FileDescriptorIsDisplayed (int fd)
	This function determines if the given file descriptor is connected to a "tty" or "console" window.

static bool	FileDescriptorHasColors (int fd)
	This function determines if the given file descriptor is displayd and supports colors.

static unsigned	StandardOutColumns ()
	This function determines the number of columns in the window if standard output is connected to a "tty" or "console" window.

static unsigned	StandardErrColumns ()
	This function determines the number of columns in the window if standard error is connected to a "tty" or "console" window.

static bool	StandardOutHasColors ()
	This function determines whether the terminal connected to standard output supports colors.

static bool	StandardErrHasColors ()
	This function determines whether the terminal connected to standard error supports colors.

static void	UseANSIEscapeCodes (bool enable)
	Enables or disables whether ANSI escape sequences are used to output colors.

static bool	ColorNeedsFlush ()
	Whether changing colors requires the output to be flushed.

static const char *	OutputColor (char c, bool bold, bool bg)
	This function returns the colorcode escape sequences.

static const char *	OutputBold (bool bg)
	Same as OutputColor, but only enables the bold attribute.

static const char *	OutputReverse ()
	This function returns the escape sequence to reverse forground and background colors.

static const char *	ResetColor ()
	Resets the terminals colors, or returns an escape sequence to do so.

static unsigned	GetRandomNumber ()
	Get the result of a process wide random number generator.

static void	Exit (int RetCode, bool NoCleanup=false)
	Equivalent to ::exit(), except when running inside a CrashRecoveryContext.

Detailed Description

A collection of legacy interfaces for querying information about the current executing process.

Definition at line 43 of file Process.h.

Member Typedef Documentation

◆ Pid

using llvm::sys::Process::Pid = int32_t

Definition at line 45 of file Process.h.

Member Function Documentation

◆ AreCoreFilesPrevented()

bool Process::AreCoreFilesPrevented ( )

static

true if PreventCoreFiles has been called, false otherwise.

Definition at line 109 of file Process.cpp.

References coreFilesPrevented.

◆ ColorNeedsFlush()

static bool llvm::sys::Process::ColorNeedsFlush ( )

static

Whether changing colors requires the output to be flushed.

This is needed on systems that don't support escape sequences for changing colors.

◆ Exit()

void Process::Exit	(	int	RetCode,
		bool	NoCleanup = `false`
	)

static

Equivalent to ::exit(), except when running inside a CrashRecoveryContext.

In that case, the control flow will resume after RunSafely(), like for a crash, rather than exiting the current process. Use

NoCleanup for calling _exit() instead of exit().

Definition at line 111 of file Process.cpp.

References llvm::CrashRecoveryContext::GetCurrent().

◆ FileDescriptorHasColors()

static bool llvm::sys::Process::FileDescriptorHasColors ( int fd )

static

This function determines if the given file descriptor is displayd and supports colors.

Referenced by llvm::raw_fd_ostream::has_colors().

◆ FileDescriptorIsDisplayed()

static bool llvm::sys::Process::FileDescriptorIsDisplayed ( int fd )

static

This function determines if the given file descriptor is connected to a "tty" or "console" window.

That is, the output would be displayed to the user rather than being put on a pipe or stored in a file.

Referenced by llvm::raw_fd_ostream::is_displayed().

◆ FindInEnvPath() [1/2]

std::optional< std::string > Process::FindInEnvPath	(	StringRef	EnvName,
		StringRef	FileName,
		ArrayRef< std::string >	IgnoreList,
		char	Separator = `EnvPathSeparator`
	)

static

This function searches for an existing file in the list of directories in a PATH like environment variable, and returns the first file found, according to the order of the entries in the PATH like environment variable.

If an ignore list is specified, then any folder which is in the PATH like environment variable but is also in IgnoreList is not considered.

Definition at line 40 of file Process.cpp.

References llvm::any_of(), llvm::sys::path::append(), assert(), llvm::sys::fs::equivalent(), llvm::sys::fs::exists(), GetEnv(), and llvm::sys::path::is_absolute().

Referenced by FindInEnvPath().

◆ FindInEnvPath() [2/2]

std::optional< std::string > Process::FindInEnvPath	(	StringRef	EnvName,
		StringRef	FileName,
		char	Separator = `EnvPathSeparator`
	)

static

Definition at line 35 of file Process.cpp.

References FindInEnvPath().

◆ FixupStandardFileDescriptors()

static std::error_code llvm::sys::Process::FixupStandardFileDescriptors ( )

static

◆ GetEnv()

static std::optional< std::string > llvm::sys::Process::GetEnv ( StringRef name )

static

Referenced by llvm::cl::expandResponseFiles(), FindInEnvPath(), llvm::findVCToolChainViaEnvironment(), getSearchPaths(), and llvm::cl::ParseCommandLineOptions().

◆ GetMallocUsage()

static size_t llvm::sys::Process::GetMallocUsage ( )

static

Return process memory usage.

This static function will return the total amount of memory allocated by the process. This only counts the memory allocated via the malloc, calloc and realloc functions and includes any "free" holes in the allocated space.

Referenced by getMemUsage().

◆ getPageSize()

static Expected< unsigned > llvm::sys::Process::getPageSize ( )

static

Get the process's page size.

This may fail if the underlying syscall returns an error. In most cases, page size information is used for optimization, and this error can be safely discarded by calling consumeError, and an estimated page size substituted instead.

Referenced by llvm::jitlink::InProcessMemoryManager::Create(), llvm::orc::InProcessMemoryMapper::Create(), llvm::orc::SharedMemoryMapper::Create(), llvm::orc::SelfExecutorProcessControl::Create(), and getPageSizeEstimate().

◆ getPageSizeEstimate()

static unsigned llvm::sys::Process::getPageSizeEstimate ( )

inlinestatic

Get the process's estimated page size.

This function always succeeds, but if the underlying syscall to determine the page size fails then this will silently return an estimated page size. The estimated page size is guaranteed to be a power of 2.

Definition at line 61 of file Process.h.

References llvm::consumeError(), getPageSize(), and PageSize.

Referenced by llvm::orc::ELFDebugObject::finalizeWorkingMemory(), getOpenFileImpl(), llvm::orc::SelfExecutorProcessControl::SelfExecutorProcessControl(), and llvm::trimBlockToPageSize().

◆ getProcessId()

static Pid llvm::sys::Process::getProcessId ( )

static

Get the process's identifier.

Referenced by llvm::CodeGenCoverage::emit(), llvm::LockFileManager::LockFileManager(), and llvm::orc::rt_bootstrap::ExecutorSharedMemoryMapperService::reserve().

◆ GetRandomNumber()

static unsigned llvm::sys::Process::GetRandomNumber ( )

static

Get the result of a process wide random number generator.

The generator will be automatically seeded in non-deterministic fashion.

Referenced by llvm::sys::fs::createUniquePath().

◆ GetTimeUsage()

static void llvm::sys::Process::GetTimeUsage	(	TimePoint<> &	elapsed,
		std::chrono::nanoseconds &	user_time,
		std::chrono::nanoseconds &	sys_time
	)

static

This static function will set user_time to the amount of CPU time spent in user (non-kernel) mode and sys_time to the amount of CPU time spent in system (kernel) mode.

If the operating system does not support collection of these metrics, a zero duration will be for both values.

Parameters

elapsed	Returns the system_clock::now() giving current time
user_time	Returns the current amount of user time for the process
sys_time	Returns the current amount of system time for the process

Referenced by llvm::TimeRecord::getCurrentTime().

◆ OutputBold()

static const char * llvm::sys::Process::OutputBold ( bool bg )

static

Same as OutputColor, but only enables the bold attribute.

Referenced by llvm::raw_ostream::changeColor().

◆ OutputColor()

static const char * llvm::sys::Process::OutputColor	(	char	c,
		bool	bold,
		bool	bg
	)

static

This function returns the colorcode escape sequences.

If ColorNeedsFlush() is true then this function will change the colors and return an empty escape sequence. In that case it is the responsibility of the client to flush the output stream prior to calling this function.

Referenced by llvm::raw_ostream::changeColor().

◆ OutputReverse()

static const char * llvm::sys::Process::OutputReverse ( )

static

This function returns the escape sequence to reverse forground and background colors.

Referenced by llvm::raw_ostream::reverseColor().

◆ PreventCoreFiles()

static void llvm::sys::Process::PreventCoreFiles ( )

static

This function makes the necessary calls to the operating system to prevent core files or any other kind of large memory dumps that can occur when a program fails.

Prevent core file generation.

◆ ResetColor()

static const char * llvm::sys::Process::ResetColor ( )

static

Resets the terminals colors, or returns an escape sequence to do so.

Referenced by llvm::raw_ostream::resetColor().

◆ SafelyCloseFileDescriptor()

static std::error_code llvm::sys::Process::SafelyCloseFileDescriptor ( int FD )

static

Referenced by llvm::FilePermissionsApplier::apply(), llvm::raw_fd_ostream::close(), copyAccessAndModificationTime(), and llvm::raw_fd_ostream::~raw_fd_ostream().

◆ StandardErrColumns()

static unsigned llvm::sys::Process::StandardErrColumns ( )

static

This function determines the number of columns in the window if standard error is connected to a "tty" or "console" window.

If standard error is not connected to a tty or console, or if the number of columns cannot be determined, this routine returns zero.

◆ StandardErrHasColors()

static bool llvm::sys::Process::StandardErrHasColors ( )

static

This function determines whether the terminal connected to standard error supports colors.

If standard error is not connected to a terminal, this function returns false.

◆ StandardErrIsDisplayed()

static bool llvm::sys::Process::StandardErrIsDisplayed ( )

static

This function determines if the standard error is connected to a "tty" or "console" window.

That is, the output would be displayed to the user rather than being put on a pipe or stored in a file.

◆ StandardInIsUserInput()

static bool llvm::sys::Process::StandardInIsUserInput ( )

static

This function determines if the standard input is connected directly to a user's input (keyboard probably), rather than coming from a file or pipe.

◆ StandardOutColumns()

static unsigned llvm::sys::Process::StandardOutColumns ( )

static

This function determines the number of columns in the window if standard output is connected to a "tty" or "console" window.

If standard output is not connected to a tty or console, or if the number of columns cannot be determined, this routine returns zero.

◆ StandardOutHasColors()

static bool llvm::sys::Process::StandardOutHasColors ( )

static

This function determines whether the terminal connected to standard output supports colors.

If standard output is not connected to a terminal, this function returns false.

◆ StandardOutIsDisplayed()

static bool llvm::sys::Process::StandardOutIsDisplayed ( )

static

This function determines if the standard output is connected to a "tty" or "console" window.

That is, the output would be displayed to the user rather than being put on a pipe or stored in a file.

◆ UseANSIEscapeCodes()

static void llvm::sys::Process::UseANSIEscapeCodes ( bool enable )

static

Enables or disables whether ANSI escape sequences are used to output colors.

This only has an effect on Windows. Note: Setting this option is not thread-safe and should only be done during initialization.

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

include/llvm/Support/Process.h
lib/Support/Process.cpp

Public Types

Static Public Member Functions

Detailed Description

Member Typedef Documentation

◆ Pid

Member Function Documentation

◆ AreCoreFilesPrevented()

◆ ColorNeedsFlush()

◆ Exit()

◆ FileDescriptorHasColors()

◆ FileDescriptorIsDisplayed()

◆ FindInEnvPath() [1/2]

◆ FindInEnvPath() [2/2]

◆ FixupStandardFileDescriptors()

◆ GetEnv()

◆ GetMallocUsage()

◆ getPageSize()

◆ getPageSizeEstimate()

◆ getProcessId()

◆ GetRandomNumber()

◆ GetTimeUsage()

◆ OutputBold()

◆ OutputColor()

◆ OutputReverse()

◆ PreventCoreFiles()

◆ ResetColor()

◆ SafelyCloseFileDescriptor()

◆ StandardErrColumns()

◆ StandardErrHasColors()

◆ StandardErrIsDisplayed()

◆ StandardInIsUserInput()

◆ StandardOutColumns()

◆ StandardOutHasColors()

◆ StandardOutIsDisplayed()

◆ UseANSIEscapeCodes()