*: add indent control files

[mirror_frr.git] / lib / network.c

/*
 * Network library.
 * Copyright (C) 1997 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra 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 Zebra 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 this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>
#include "log.h"
#include "network.h"

/* Read nbytes from fd and store into ptr. */
int
readn (int fd, u_char *ptr, int nbytes)
{
  int nleft;
  int nread;

  nleft = nbytes;

  while (nleft > 0) 
    {
      nread = read (fd, ptr, nleft);

      if (nread < 0) 
	return (nread);
      else
	if (nread == 0) 
	  break;

      nleft -= nread;
      ptr += nread;
    }

  return nbytes - nleft;
}  

/* Write nbytes from ptr to fd. */
int
writen(int fd, const u_char *ptr, int nbytes)
{
  int nleft;
  int nwritten;

  nleft = nbytes;

  while (nleft > 0) 
    {
      nwritten = write(fd, ptr, nleft);

      if (nwritten < 0)
	{
	  if (!ERRNO_IO_RETRY(errno))
	    return nwritten;
	}
      if (nwritten == 0) 
	return (nwritten);

      nleft -= nwritten;
      ptr += nwritten;
    }
  return nbytes - nleft;
}

int
set_nonblocking(int fd)
{
  int flags;

  /* According to the Single UNIX Spec, the return value for F_GETFL should
     never be negative. */
  if ((flags = fcntl(fd, F_GETFL)) < 0)
    {
      zlog_warn("fcntl(F_GETFL) failed for fd %d: %s",
      		fd, safe_strerror(errno));
      return -1;
    }
  if (fcntl(fd, F_SETFL, (flags | O_NONBLOCK)) < 0)
    {
      zlog_warn("fcntl failed setting fd %d non-blocking: %s",
      		fd, safe_strerror(errno));
      return -1;
    }
  return 0;
}

int
set_cloexec(int fd)
{
  int flags;
  flags = fcntl(fd, F_GETFD, 0);
  if (flags == -1)
    return -1;

  flags |= FD_CLOEXEC;
  if (fcntl(fd, F_SETFD, flags) == -1)
    return -1;
  return 0;
}

float
htonf (float host)
{
  u_int32_t lu1, lu2;
  float convert;

  memcpy (&lu1, &host, sizeof (u_int32_t));
  lu2 = htonl (lu1);
  memcpy (&convert, &lu2, sizeof (u_int32_t));
  return convert;
}

float
ntohf (float net)
{
  return htonf (net);
}