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//===- llvm/System/Process.h ------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file 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.
/// @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.
/// @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();
/// 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.
static bool FileDescriptorIsDisplayed(int fd);
/// 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.
static unsigned StandardOutColumns();
/// 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.
static unsigned StandardErrColumns();
/// 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.
static bool StandardOutHasColors();
/// 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.
static bool StandardErrHasColors();
/// Whether changing colors requires the output to be flushed.
/// This is needed on systems that don't support escape sequences for
/// changing colors.
static bool ColorNeedsFlush();
/// 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.
static const char *OutputColor(char c, bool bold, bool bg);
/// Same as OutputColor, but only enables the bold attribute.
static const char *OutputBold(bool bg);
/// Resets the terminals colors, or returns an escape sequence to do so.
static const char *ResetColor();
/// @}
};
}
}
#endif
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