92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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// Author: kenton@google.com (Kenton Varda)
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#ifndef GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
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#define GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
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#ifdef _WIN32
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN // right...
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#endif
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#include <windows.h>
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#else // _WIN32
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#include <sys/types.h>
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#include <unistd.h>
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#endif // !_WIN32
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#include <string>
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#include "google/protobuf/port.h"
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// Must be included last.
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#include "google/protobuf/port_def.inc"
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namespace google {
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namespace protobuf {
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class Message;
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namespace compiler {
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// Utility class for launching sub-processes.
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class PROTOC_EXPORT Subprocess {
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public:
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Subprocess();
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~Subprocess();
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enum SearchMode {
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SEARCH_PATH, // Use PATH environment variable.
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EXACT_NAME // Program is an exact file name; don't use the PATH.
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};
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// Start the subprocess. Currently we don't provide a way to specify
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// arguments as protoc plugins don't have any.
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void Start(const std::string& program, SearchMode search_mode);
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// Serialize the input message and pipe it to the subprocess's stdin, then
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// close the pipe. Meanwhile, read from the subprocess's stdout and parse
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// the data into *output. All this is done carefully to avoid deadlocks.
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// Returns true if successful. On any sort of error, returns false and sets
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// *error to a description of the problem.
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bool Communicate(const Message& input, Message* output, std::string* error);
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#ifdef _WIN32
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// Given an error code, returns a human-readable error message. This is
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// defined here so that CommandLineInterface can share it.
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static std::string Win32ErrorMessage(DWORD error_code);
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#endif
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private:
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#ifdef _WIN32
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DWORD process_start_error_;
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HANDLE child_handle_;
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// The file handles for our end of the child's pipes. We close each and
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// set it to NULL when no longer needed.
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HANDLE child_stdin_;
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HANDLE child_stdout_;
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#else // _WIN32
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pid_t child_pid_;
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// The file descriptors for our end of the child's pipes. We close each and
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// set it to -1 when no longer needed.
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int child_stdin_;
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int child_stdout_;
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#endif // !_WIN32
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};
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} // namespace compiler
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} // namespace protobuf
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} // namespace google
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#include "google/protobuf/port_undef.inc"
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#endif // GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
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