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https://git.proxmox.com/git/mirror_frr
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acddc0ed3c
Done with a combination of regex'ing and banging my head against a wall. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Network library header.
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* Copyright (C) 1998 Kunihiro Ishiguro
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*/
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#ifndef _ZEBRA_NETWORK_H
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#define _ZEBRA_NETWORK_H
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#ifdef HAVE_SYS_ENDIAN_H
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#include <sys/endian.h>
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#endif
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#ifdef HAVE_ENDIAN_H
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#include <endian.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Both readn and writen are deprecated and will be removed. They are not
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suitable for use with non-blocking file descriptors.
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*/
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extern int readn(int, uint8_t *, int);
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extern int writen(int, const uint8_t *, int);
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/* Set the file descriptor to use non-blocking I/O. Returns 0 for success,
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-1 on error. */
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extern int set_nonblocking(int fd);
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extern int set_cloexec(int fd);
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/* Does the I/O error indicate that the operation should be retried later? */
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#define ERRNO_IO_RETRY(EN) \
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(((EN) == EAGAIN) || ((EN) == EWOULDBLOCK) || ((EN) == EINTR))
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extern float htonf(float);
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extern float ntohf(float);
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/* force type for be64toh/htobe64 to be uint64_t, *without* a direct cast
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*
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* this is a workaround for false-positive printfrr warnings from FRR's
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* frr-format GCC plugin that would be triggered from
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* { printfrr("%"PRIu64, (uint64_t)be64toh(...)); }
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*
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* the key element here is that "(uint64_t)expr" causes the warning, while
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* "({ uint64_t x = expr; x; })" does not. (The cast is the trigger, a
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* variable of the same type works correctly.)
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*/
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/* zap system definitions... */
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#ifdef be64toh
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#undef be64toh
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#endif
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#ifdef htobe64
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#undef htobe64
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define be64toh(x) ({ uint64_t r = __builtin_bswap64(x); r; })
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#define htobe64(x) ({ uint64_t r = __builtin_bswap64(x); r; })
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#elif BYTE_ORDER == BIG_ENDIAN
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#define be64toh(x) ({ uint64_t r = (x); r; })
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#define htobe64(x) ({ uint64_t r = (x); r; })
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#else
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#error nobody expects the endianish inquisition. check OS endian.h headers.
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#endif
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/**
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* Generate a sequence number using monotonic clock with a same second call
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* protection to help guarantee a unique incremental sequence number that never
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* goes back (except when wrapping/overflow).
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*
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* **NOTE** this function is not thread safe since it uses `static` variable.
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*
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* This function and `frr_sequence32_next` should be used to initialize
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* sequence numbers without directly calling other `time_t` returning
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* functions because of `time_t` truncation warnings.
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*
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* \returns `uint64_t` number based on the monotonic clock.
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*/
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extern uint64_t frr_sequence_next(void);
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/** Same as `frr_sequence_next` but returns truncated number. */
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extern uint32_t frr_sequence32_next(void);
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/**
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* Helper function that returns a random long value. The main purpose of
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* this function is to hide a `random()` call that gets flagged by coverity
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* scan and put it into one place.
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*
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* The main usage of this function should be for generating jitter or weak
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* random values for simple purposes.
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*
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* See 'man 3 random' for more information.
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*
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* \returns random long integer.
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*/
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static inline long frr_weak_random(void)
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{
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/* coverity[dont_call] */
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return random();
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ZEBRA_NETWORK_H */
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