Method read_stdout

coprocess-win32.cpp:252–269

}

size_t		Coprocess::read_stdout (void* handle, void* buf, size_t count)
{
	// Note that ReadFile on a pipe may return with bytes_read==0 if the other
	// end of the pipe writes zero bytes, so retry when this happens.
	// When the other end of the pipe actually closes, ReadFile
	// fails with ERROR_BROKEN_PIPE.
	DWORD bytes_read;
	do {
		if (!ReadFile(static_cast<Coprocess*>(handle)->stdout_pipe_reader, buf, count, &bytes_read, nullptr)) {
			const DWORD	read_error = GetLastError();
			if (read_error != ERROR_BROKEN_PIPE) {
				throw System_error("ReadFile", "", read_error);
			}
			return 0;
		}
	} while (bytes_read == 0);
	return bytes_read;
}