text: 
  /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  #include "config.h"
  #include "io.h"
  
  #include <unistd.h>
  
  int guac_drv_write(int fd, void* buffer, int length) {
      
      unsigned char* bytes = (unsigned char*) buffer;
  
      while (length > 0) {
  
          /* Attempt write */
          int bytes_written = write(fd, bytes, length);
          if (bytes_written < 0)
              return bytes_written;
  
          /* Update buffer */
          length -= bytes_written;
          bytes += bytes_written;
  
      }
  
      /* Success */
      return length;
  
  }
  
  int guac_drv_read(int fd, void* buffer, int length) {
  
      unsigned char* bytes = (unsigned char*) buffer;
  
      while (length > 0) {
  
          /* Attempt read */
          int bytes_read = read(fd, bytes, length);
          if (bytes_read < 0)
              return bytes_read;
  
          /* Update buffer */
          length -= bytes_read;
          bytes += bytes_read;
  
      }
  
      /* Success */
      return length;
  
  }
  
  