82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2023 Google LLC. 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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// Shamelessly copied from the protobuf compiler's subprocess.h
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// except this version passes strings instead of Messages.
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#ifndef THIRD_PARTY_UPB_UPB_GENERATOR_H_
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#define THIRD_PARTY_UPB_UPB_GENERATOR_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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namespace upb {
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namespace generator {
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// Utility class for launching sub-processes.
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class 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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// Pipe the input message to the subprocess's stdin, then close the pipe.
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// Meanwhile, read from the subprocess's stdout and copy into *output.
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// 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 std::string& input_data, std::string* output_data,
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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 generator
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} // namespace upb
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#endif // THIRD_PARTY_UPB_UPB_GENERATOR_H_
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