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/*
* 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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, 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)
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;
}
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