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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:53:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:53:30 +0000 |
commit | 2c7cac91ed6e7db0f6937923d2b57f97dbdbc337 (patch) | |
tree | c05dc0f8e6aa3accc84e3e5cffc933ed94941383 /lib/network.h | |
parent | Initial commit. (diff) | |
download | frr-upstream/8.4.4.tar.xz frr-upstream/8.4.4.zip |
Adding upstream version 8.4.4.upstream/8.4.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | lib/network.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/lib/network.h b/lib/network.h new file mode 100644 index 0000000..10ed917 --- /dev/null +++ b/lib/network.h @@ -0,0 +1,106 @@ +/* + * Network library header. + * Copyright (C) 1998 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 + */ + +#ifndef _ZEBRA_NETWORK_H +#define _ZEBRA_NETWORK_H + +#ifdef HAVE_SYS_ENDIAN_H +#include <sys/endian.h> +#endif +#ifdef HAVE_ENDIAN_H +#include <endian.h> +#endif + +#ifdef __cplusplus +extern "C" { +#endif + +/* Both readn and writen are deprecated and will be removed. They are not + suitable for use with non-blocking file descriptors. + */ +extern int readn(int, uint8_t *, int); +extern int writen(int, const uint8_t *, int); + +/* Set the file descriptor to use non-blocking I/O. Returns 0 for success, + -1 on error. */ +extern int set_nonblocking(int fd); + +extern int set_cloexec(int fd); + +/* Does the I/O error indicate that the operation should be retried later? */ +#define ERRNO_IO_RETRY(EN) \ + (((EN) == EAGAIN) || ((EN) == EWOULDBLOCK) || ((EN) == EINTR)) + +extern float htonf(float); +extern float ntohf(float); + +/* force type for be64toh/htobe64 to be uint64_t, *without* a direct cast + * + * this is a workaround for false-positive printfrr warnings from FRR's + * frr-format GCC plugin that would be triggered from + * { printfrr("%"PRIu64, (uint64_t)be64toh(...)); } + * + * the key element here is that "(uint64_t)expr" causes the warning, while + * "({ uint64_t x = expr; x; })" does not. (The cast is the trigger, a + * variable of the same type works correctly.) + */ + +/* zap system definitions... */ +#ifdef be64toh +#undef be64toh +#endif +#ifdef htobe64 +#undef htobe64 +#endif + +#if BYTE_ORDER == LITTLE_ENDIAN +#define be64toh(x) ({ uint64_t r = __builtin_bswap64(x); r; }) +#define htobe64(x) ({ uint64_t r = __builtin_bswap64(x); r; }) +#elif BYTE_ORDER == BIG_ENDIAN +#define be64toh(x) ({ uint64_t r = (x); r; }) +#define htobe64(x) ({ uint64_t r = (x); r; }) +#else +#error nobody expects the endianish inquisition. check OS endian.h headers. +#endif + +/** + * Helper function that returns a random long value. The main purpose of + * this function is to hide a `random()` call that gets flagged by coverity + * scan and put it into one place. + * + * The main usage of this function should be for generating jitter or weak + * random values for simple purposes. + * + * See 'man 3 random' for more information. + * + * \returns random long integer. + */ +static inline long frr_weak_random(void) +{ + /* coverity[dont_call] */ + return random(); +} + +#ifdef __cplusplus +} +#endif + +#endif /* _ZEBRA_NETWORK_H */ |