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124 lines
2.5 KiB
C
124 lines
2.5 KiB
C
/*
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* Network library.
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* Copyright (C) 1997 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <zebra.h>
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#include "log.h"
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#include "network.h"
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#include "lib_errors.h"
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/* Read nbytes from fd and store into ptr. */
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int readn(int fd, uint8_t *ptr, int nbytes)
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{
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int nleft;
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int nread;
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nleft = nbytes;
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while (nleft > 0) {
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nread = read(fd, ptr, nleft);
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if (nread < 0)
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return (nread);
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else if (nread == 0)
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break;
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nleft -= nread;
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ptr += nread;
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}
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return nbytes - nleft;
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}
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/* Write nbytes from ptr to fd. */
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int writen(int fd, const uint8_t *ptr, int nbytes)
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{
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int nleft;
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int nwritten;
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nleft = nbytes;
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while (nleft > 0) {
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nwritten = write(fd, ptr, nleft);
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if (nwritten < 0) {
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if (!ERRNO_IO_RETRY(errno))
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return nwritten;
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}
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if (nwritten == 0)
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return (nwritten);
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nleft -= nwritten;
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ptr += nwritten;
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}
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return nbytes - nleft;
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}
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int set_nonblocking(int fd)
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{
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int flags;
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/* According to the Single UNIX Spec, the return value for F_GETFL
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should
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never be negative. */
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if ((flags = fcntl(fd, F_GETFL)) < 0) {
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flog_err(EC_LIB_SYSTEM_CALL,
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"fcntl(F_GETFL) failed for fd %d: %s", fd,
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safe_strerror(errno));
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return -1;
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}
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if (fcntl(fd, F_SETFL, (flags | O_NONBLOCK)) < 0) {
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flog_err(EC_LIB_SYSTEM_CALL,
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"fcntl failed setting fd %d non-blocking: %s", fd,
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safe_strerror(errno));
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return -1;
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}
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return 0;
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}
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int set_cloexec(int fd)
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{
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int flags;
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flags = fcntl(fd, F_GETFD, 0);
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if (flags == -1)
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return -1;
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flags |= FD_CLOEXEC;
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if (fcntl(fd, F_SETFD, flags) == -1)
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return -1;
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return 0;
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}
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float htonf(float host)
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{
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uint32_t lu1, lu2;
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float convert;
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memcpy(&lu1, &host, sizeof(uint32_t));
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lu2 = htonl(lu1);
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memcpy(&convert, &lu2, sizeof(uint32_t));
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return convert;
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}
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float ntohf(float net)
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{
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return htonf(net);
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}
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