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95 lines
4.6 KiB
C++
95 lines
4.6 KiB
C++
//===- llvm/System/Program.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::Program class.
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//
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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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namespace llvm {
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namespace sys {
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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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/// @since 1.4
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/// @brief An abstraction for finding and executing programs.
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class Program {
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/// @name Methods
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/// @{
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public:
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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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/// @throws nothing
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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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/// This function executes the program using the \p arguments provided and
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/// waits for the program to exit. This function will block the current
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/// program until the invoked program exits. The invoked program will
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/// inherit the stdin, stdout, and stderr file descriptors, the
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/// environment and other configuration settings of the invoking program.
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/// If Path::executable() does not return true when this function is
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/// called then a std::string is thrown.
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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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/// @see FindProgrambyName
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/// @brief Executes the program with the given set of \p args.
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static int ExecuteAndWait(
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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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///< way.
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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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///< it doesn't.
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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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///< program.
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);
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// These methods change the specified standard stream (stdin or stdout) to
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// binary mode. They return true if an error occurred
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static bool ChangeStdinToBinary();
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static bool ChangeStdoutToBinary();
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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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