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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 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"
#include "lib_errors.h"
/* Read nbytes from fd and store into ptr. */
int readn(int fd, uint8_t *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 uint8_t *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. */
flags = fcntl(fd, F_GETFL);
if (flags < 0) {
flog_err(EC_LIB_SYSTEM_CALL,
"fcntl(F_GETFL) failed for fd %d: %s", fd,
safe_strerror(errno));
return -1;
}
if (fcntl(fd, F_SETFL, (flags | O_NONBLOCK)) < 0) {
flog_err(EC_LIB_SYSTEM_CALL,
"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)
{
uint32_t lu1, lu2;
float convert;
memcpy(&lu1, &host, sizeof(uint32_t));
lu2 = htonl(lu1);
memcpy(&convert, &lu2, sizeof(uint32_t));
return convert;
}
float ntohf(float net)
{
return htonf(net);
}
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