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Diffstat (limited to '')
-rw-r--r-- | lib/network.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/lib/network.c b/lib/network.c new file mode 100644 index 0000000..b60ad9a --- /dev/null +++ b/lib/network.c @@ -0,0 +1,124 @@ +/* + * 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); +} |