// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Author: kenton@google.com (Kenton Varda)
#ifndef GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
#define GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
#include <vector>
#include <string>
#include <sys/types.h>
#include <unistd.h>
#include <google/protobuf/stubs/common.h>
namespace google {
namespace protobuf {
class Message;
namespace compiler {
// Utility class for launching sub-processes.
class Subprocess {
public:
Subprocess();
~Subprocess();
enum SearchMode {
SEARCH_PATH, // Use PATH environment variable.
EXACT_NAME // Program is an exact file name; don't use the PATH.
};
// Start the subprocess. Currently we don't provide a way to specify
// arguments as protoc plugins don't have any.
void Start(const string& program, SearchMode search_mode);
// Serialize the input message and pipe it to the subprocess's stdin, then
// close the pipe. Meanwhile, read from the subprocess's stdout and parse
// the data into *output. All this is done carefully to avoid deadlocks.
// Returns true if successful. On any sort of error, returns false and sets
// *error to a description of the problem.
bool Communicate(const Message& input, Message* output, string* error);
private:
pid_t child_pid_;
// The file descriptors for our end of the child's pipes. We close each and
// set it to -1 when no longer needed.
int child_stdin_;
int child_stdout_;
};
} // namespace compiler
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
