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//===- llvm/System/Program.h ------------------------------------*- C++ -*-===//
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// The LLVM Compiler Infrastructure
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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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// This file declares the llvm::sys::Program class.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SYSTEM_PROGRAM_H
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#define LLVM_SYSTEM_PROGRAM_H
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#include "llvm/System/Path.h"
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// TODO: Add operations to communicate with the process, redirect its I/O,
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/// This class provides an abstraction for programs that are executable by the
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/// operating system. It provides a platform generic way to find executable
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/// programs from the path and to execute them in various ways. The sys::Path
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/// class is used to specify the location of the Program.
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/// @brief An abstraction for finding and executing programs.
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/// Opaque handle for target specific data.
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Program(const Program& other);
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Program& operator=(const Program& other);
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/// Return process ID of this program.
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unsigned GetPid() const;
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/// This function executes the program using the \p arguments provided. The
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/// invoked program will inherit the stdin, stdout, and stderr file
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/// descriptors, the environment and other configuration settings of the
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/// invoking program. If Path::executable() does not return true when this
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/// function is called then a std::string is thrown.
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/// @returns false in case of error, true otherwise.
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/// @see FindProgramByName
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/// @brief Executes the program with the given set of \p args.
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( const Path& path, ///< sys::Path object providing the path of the
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///< program to be executed. It is presumed this is the result of
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///< the FindProgramByName method.
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const char** args, ///< A vector of strings that are passed to the
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///< program. The first element should be the name of the program.
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///< The list *must* be terminated by a null char* entry.
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const char ** env = 0, ///< An optional vector of strings to use for
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///< the program's environment. If not provided, the current program's
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///< environment will be used.
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const sys::Path** redirects = 0, ///< An optional array of pointers to
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///< Paths. If the array is null, no redirection is done. The array
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///< should have a size of at least three. If the pointer in the array
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///< are not null, then the inferior process's stdin(0), stdout(1),
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///< and stderr(2) will be redirected to the corresponding Paths.
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///< When an empty Path is passed in, the corresponding file
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///< descriptor will be disconnected (ie, /dev/null'd) in a portable
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unsigned memoryLimit = 0, ///< If non-zero, this specifies max. amount
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///< of memory can be allocated by process. If memory usage will be
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///< higher limit, the child is killed and this call returns. If zero
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///< - no memory limit.
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std::string* ErrMsg = 0 ///< If non-zero, provides a pointer to a string
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///< instance in which error messages will be returned. If the string
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///< is non-empty upon return an error occurred while invoking the
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/// This function waits for the program to exit. This function will block
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/// the current program until the invoked program exits.
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/// @returns an integer result code indicating the status of the program.
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/// A zero or positive value indicates the result code of the program. A
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/// negative value is the signal number on which it terminated.
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/// @brief Waits for the program to exit.
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( unsigned secondsToWait = 0, ///< If non-zero, this specifies the amount
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///< of time to wait for the child process to exit. If the time
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///< expires, the child is killed and this call returns. If zero,
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///< this function will wait until the child finishes or forever if
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std::string* ErrMsg = 0 ///< If non-zero, provides a pointer to a string
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///< instance in which error messages will be returned. If the string
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///< is non-empty upon return an error occurred while waiting.
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/// This function terminates the program.
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/// @returns true if an error occured.
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/// @brief Terminates the program.
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( std::string* ErrMsg = 0 ///< If non-zero, provides a pointer to a string
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///< instance in which error messages will be returned. If the string
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///< is non-empty upon return an error occurred while killing the
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/// This static constructor (factory) will attempt to locate a program in
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/// the operating system's file system using some pre-determined set of
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/// locations to search (e.g. the PATH on Unix).
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/// @returns A Path object initialized to the path of the program or a
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/// Path object that is empty (invalid) if the program could not be found.
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/// @brief Construct a Program by finding it by name.
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static Path FindProgramByName(const std::string& name);
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// These methods change the specified standard stream (stdin,
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// stdout, or stderr) to binary mode. They return true if an error
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static bool ChangeStdinToBinary();
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static bool ChangeStdoutToBinary();
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static bool ChangeStderrToBinary();
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/// A convenience function equivalent to Program prg; prg.Execute(..);
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/// @see Execute, Wait
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static int ExecuteAndWait(const Path& path,
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const char ** env = 0,
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const sys::Path** redirects = 0,
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unsigned secondsToWait = 0,
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unsigned memoryLimit = 0,
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std::string* ErrMsg = 0);
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/// A convenience function equivalent to Program prg; prg.Execute(..);
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static void ExecuteNoWait(const Path& path,
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const char ** env = 0,
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const sys::Path** redirects = 0,
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unsigned memoryLimit = 0,
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std::string* ErrMsg = 0);