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//===- llvm/System/Process.h ------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the llvm::sys::Process class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SYSTEM_PROCESS_H
#define LLVM_SYSTEM_PROCESS_H
#include "llvm/System/TimeValue.h"
namespace llvm {
namespace sys {
/// This class provides an abstraction for getting information about the
/// currently executing process.
/// @since 1.4
/// @brief An abstraction for operating system processes.
class Process {
/// @name Accessors
/// @{
public:
/// This static function will return the operating system's virtual memory
/// page size.
/// @returns The number of bytes in a virtual memory page.
/// @throws nothing
/// @brief Get the virtual memory page size
static unsigned GetPageSize();
/// 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.
/// @throws nothing
/// @brief Return process memory usage.
static size_t GetMallocUsage();
/// This static function will return the total memory usage of the
/// process. This includes code, data, stack and mapped pages usage. Notei
/// that the value returned here is not necessarily the Running Set Size,
/// it is the total virtual memory usage, regardless of mapped state of
/// that memory.
static size_t GetTotalMemoryUsage();
/// This static function will set \p user_time to the amount of CPU time
/// spent in user (non-kernel) mode and \p 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 TimeValue will be for both
/// values.
static void GetTimeUsage(
TimeValue& elapsed,
///< Returns the TimeValue::now() giving current time
TimeValue& user_time,
///< Returns the current amount of user time for the process
TimeValue& sys_time
///< Returns the current amount of system time for the process
);
/// This static function will return the process' current user id number.
/// Not all operating systems support this feature. Where it is not
/// supported, the function should return 65536 as the value.
static int GetCurrentUserId();
/// This static function will return the process' current group id number.
/// Not all operating systems support this feature. Where it is not
/// supported, the function should return 65536 as the value.
static int GetCurrentGroupId();
/// 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.
/// @brief Prevent core file generation.
static void PreventCoreFiles();
/// 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 StandardInIsUserInput();
/// 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.
static bool StandardOutIsDisplayed();
/// 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.
static bool StandardErrIsDisplayed();
/// @}
};
}
}
#endif
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