-//===- llvm/Support/Process.h ------------------------------------*- C++ -*-===//
+//===- llvm/Support/Process.h -----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
-//
-// This file declares the llvm::sys::Process class.
-//
+/// \file
+///
+/// Provides a library for accessing information about this process and other
+/// processes on the operating system. Also provides means of spawning
+/// subprocess for commands. The design of this library is modeled after the
+/// proposed design of the Boost.Process library, and is design specifically to
+/// follow the style of standard libraries and potentially become a proposal
+/// for a standard library.
+///
+/// This file declares the llvm::sys::Process class which contains a collection
+/// of legacy static interfaces for extracting various information about the
+/// current process. The goal is to migrate users of this API over to the new
+/// interfaces.
+///
//===----------------------------------------------------------------------===//
-#ifndef LLVM_SYSTEM_PROCESS_H
-#define LLVM_SYSTEM_PROCESS_H
+#ifndef LLVM_SUPPORT_PROCESS_H
+#define LLVM_SUPPORT_PROCESS_H
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/DataTypes.h"
#include "llvm/Support/TimeValue.h"
+#include <system_error>
namespace llvm {
+class StringRef;
+
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();
- /// @}
- };
+
+/// \brief A collection of legacy interfaces for querying information about the
+/// current executing process.
+class Process {
+public:
+ static unsigned getPageSize();
+
+ /// \brief 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.
+ static size_t GetMallocUsage();
+
+ /// 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.
+ /// \param elapsed Returns the TimeValue::now() giving current time
+ /// \param user_time Returns the current amount of user time for the process
+ /// \param sys_time Returns the current amount of system time for the process
+ static void GetTimeUsage(TimeValue &elapsed, TimeValue &user_time,
+ TimeValue &sys_time);
+
+ /// 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 returns the environment variable \arg name's value as a UTF-8
+ // string. \arg Name is assumed to be in UTF-8 encoding too.
+ static Optional<std::string> GetEnv(StringRef name);
+
+ /// 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 Optional<std::string> FindInEnvPath(const std::string& EnvName,
+ const std::string& FileName);
+
+ /// This function returns a SmallVector containing the arguments passed from
+ /// the operating system to the program. This function expects to be handed
+ /// the vector passed in from main.
+ static std::error_code
+ GetArgumentVector(SmallVectorImpl<const char *> &Args,
+ ArrayRef<const char *> ArgsFromMain,
+ SpecificBumpPtrAllocator<char> &ArgAllocator);
+
+ // This functions ensures that the standard file descriptors (input, output,
+ // and error) are properly mapped to a file descriptor before we use any of
+ // them. This should only be called by standalone programs, library
+ // components should not call this.
+ static std::error_code FixupStandardFileDescriptors();
+
+ // This function safely closes a file descriptor. It is not safe to retry
+ // close(2) when it returns with errno equivalent to EINTR; this is because
+ // *nixen cannot agree if the file descriptor is, in fact, closed when this
+ // occurs.
+ //
+ // N.B. Some operating systems, due to thread cancellation, cannot properly
+ // guarantee that it will or will not be closed one way or the other!
+ static std::error_code SafelyCloseFileDescriptor(int FD);
+
+ /// 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 if the given file descriptor is displayd and
+ /// supports colors.
+ static bool FileDescriptorHasColors(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();
+
+ /// 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.
+ static void UseANSIEscapeCodes(bool enable);
+
+ /// 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);
+
+ /// This function returns the escape sequence to reverse forground and
+ /// background colors.
+ static const char *OutputReverse();
+
+ /// Resets the terminals colors, or returns an escape sequence to do so.
+ static const char *ResetColor();
+
+ /// Get the result of a process wide random number generator. The
+ /// generator will be automatically seeded in non-deterministic fashion.
+ static unsigned GetRandomNumber();
+};
+
}
}
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