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103 lines
4.1 KiB
C++
103 lines
4.1 KiB
C++
//===- llvm/System/Process.h ------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys::Process class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SYSTEM_PROCESS_H
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#define LLVM_SYSTEM_PROCESS_H
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#include "llvm/System/TimeValue.h"
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namespace llvm {
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namespace sys {
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/// This class provides an abstraction for getting information about the
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/// currently executing process.
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/// @since 1.4
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/// @brief An abstraction for operating system processes.
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class Process {
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/// @name Accessors
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/// @{
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public:
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/// This static function will return the operating system's virtual memory
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/// page size.
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/// @returns The number of bytes in a virtual memory page.
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/// @throws nothing
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/// @brief Get the virtual memory page size
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static unsigned GetPageSize();
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/// This static function will return the total amount of memory allocated
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/// by the process. This only counts the memory allocated via the malloc,
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/// calloc and realloc functions and includes any "free" holes in the
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/// allocated space.
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/// @throws nothing
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/// @brief Return process memory usage.
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static size_t GetMallocUsage();
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/// This static function will return the total memory usage of the
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/// process. This includes code, data, stack and mapped pages usage. Notei
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/// that the value returned here is not necessarily the Running Set Size,
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/// it is the total virtual memory usage, regardless of mapped state of
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/// that memory.
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static size_t GetTotalMemoryUsage();
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/// This static function will set \p user_time to the amount of CPU time
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/// spent in user (non-kernel) mode and \p sys_time to the amount of CPU
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/// time spent in system (kernel) mode. If the operating system does not
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/// support collection of these metrics, a zero TimeValue will be for both
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/// values.
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static void GetTimeUsage(
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TimeValue& elapsed,
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///< Returns the TimeValue::now() giving current time
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TimeValue& user_time,
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///< Returns the current amount of user time for the process
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TimeValue& sys_time
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///< Returns the current amount of system time for the process
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);
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/// This static function will return the process' current user id number.
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/// Not all operating systems support this feature. Where it is not
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/// supported, the function should return 65536 as the value.
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static int GetCurrentUserId();
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/// This static function will return the process' current group id number.
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/// Not all operating systems support this feature. Where it is not
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/// supported, the function should return 65536 as the value.
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static int GetCurrentGroupId();
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/// This function makes the necessary calls to the operating system to
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/// prevent core files or any other kind of large memory dumps that can
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/// occur when a program fails.
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/// @brief Prevent core file generation.
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static void PreventCoreFiles();
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/// This function determines if the standard input is connected directly
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/// to a user's input (keyboard probably), rather than coming from a file
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/// or pipe.
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static bool StandardInIsUserInput();
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/// This function determines if the standard output is connected to a
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/// "tty" or "console" window. That is, the output would be displayed to
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/// the user rather than being put on a pipe or stored in a file.
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static bool StandardOutIsDisplayed();
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/// This function determines if the standard error is connected to a
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/// "tty" or "console" window. That is, the output would be displayed to
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/// the user rather than being put on a pipe or stored in a file.
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static bool StandardErrIsDisplayed();
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/// @}
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};
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}
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}
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#endif
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