gr_file_descriptor_sink.cc

gnuradio软件无线电源程序.现在的手机多基于软件无线电

/* -*- c++ -*- */
/*
 * Copyright 2004 Free Software Foundation, Inc.
 * 
 * This file is part of GNU Radio
 * 
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 * 
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gr_file_descriptor_sink.h>
#include <gr_io_signature.h>
#include <cstdio>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdexcept>


gr_file_descriptor_sink::gr_file_descriptor_sink (size_t itemsize, int fd)
  : gr_sync_block ("file_descriptor_sink",
		   gr_make_io_signature (1, 1, itemsize),
		   gr_make_io_signature (0, 0, 0)),
    d_itemsize (itemsize), d_fd (fd)
{
}

gr_file_descriptor_sink_sptr
gr_make_file_descriptor_sink (size_t itemsize, int fd)
{
  return gr_file_descriptor_sink_sptr (new gr_file_descriptor_sink (itemsize, fd));
}

gr_file_descriptor_sink::~gr_file_descriptor_sink ()
{
  close (d_fd);
}

int 
gr_file_descriptor_sink::work (int noutput_items,
			       gr_vector_const_void_star &input_items,
			       gr_vector_void_star &output_items)
{
  char *inbuf = (char *) input_items[0];
  unsigned long byte_size = noutput_items * d_itemsize;

  while (byte_size > 0){
    ssize_t	r;

    r = write (d_fd, inbuf, byte_size);
    if (r == -1){
      if (errno == EINTR)
	continue;
      else {
	perror ("gr_file_descriptor_sink");
	return -1;		// indicate we're done
      }
    }
    else {
      byte_size -= r;
      inbuf += r;
    }
  }

  return noutput_items;
}