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//===- llvm/Support/Program.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::Program class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_PROGRAM_H
#define LLVM_SUPPORT_PROGRAM_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/system_error.h"
namespace llvm {
class error_code;
namespace sys {
/// This static constructor (factory) will attempt to locate a program in
/// the operating system's file system using some pre-determined set of
/// locations to search (e.g. the PATH on Unix). Paths with slashes are
/// returned unmodified.
/// @returns A Path object initialized to the path of the program or a
/// Path object that is empty (invalid) if the program could not be found.
/// @brief Construct a Program by finding it by name.
std::string FindProgramByName(const std::string& name);
// These functions change the specified standard stream (stdin, stdout, or
// stderr) to binary mode. They return errc::success if the specified stream
// was changed. Otherwise a platform dependent error is returned.
error_code ChangeStdinToBinary();
error_code ChangeStdoutToBinary();
error_code ChangeStderrToBinary();
/// This function executes the program using the arguments provided. The
/// invoked program will inherit the stdin, stdout, and stderr file
/// descriptors, the environment and other configuration settings of the
/// invoking program.
/// This function waits the program to finish.
/// @returns an integer result code indicating the status of the program.
/// A zero or positive value indicates the result code of the program.
/// -1 indicates failure to execute
/// -2 indicates a crash during execution or timeout
int ExecuteAndWait(
StringRef Program, ///< Path of the program to be executed. It is
/// presumed this is the result of the FindProgramByName method.
const char **args, ///< A vector of strings that are passed to the
///< program. The first element should be the name of the program.
///< The list *must* be terminated by a null char* entry.
const char **env = 0, ///< An optional vector of strings to use for
///< the program's environment. If not provided, the current program's
///< environment will be used.
const StringRef **redirects = 0, ///< An optional array of pointers to
///< paths. If the array is null, no redirection is done. The array
///< should have a size of at least three. The inferior process's
///< stdin(0), stdout(1), and stderr(2) will be redirected to the
///< corresponding paths.
///< When an empty path is passed in, the corresponding file
///< descriptor will be disconnected (ie, /dev/null'd) in a portable
///< way.
unsigned secondsToWait = 0, ///< If non-zero, this specifies the amount
///< of time to wait for the child process to exit. If the time
///< expires, the child is killed and this call returns. If zero,
///< this function will wait until the child finishes or forever if
///< it doesn't.
unsigned memoryLimit = 0, ///< If non-zero, this specifies max. amount
///< of memory can be allocated by process. If memory usage will be
///< higher limit, the child is killed and this call returns. If zero
///< - no memory limit.
std::string *ErrMsg = 0, ///< If non-zero, provides a pointer to a string
///< instance in which error messages will be returned. If the string
///< is non-empty upon return an error occurred while invoking the
///< program.
bool *ExecutionFailed = 0);
/// Similar to ExecuteAndWait, but return immediately.
void ExecuteNoWait(StringRef Program, const char **args, const char **env = 0,
const StringRef **redirects = 0, unsigned memoryLimit = 0,
std::string *ErrMsg = 0);
// Return true if the given arguments fit within system-specific
// argument length limits.
bool argumentsFitWithinSystemLimits(ArrayRef<const char*> Args);
}
}
#endif
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