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/*
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* Copyright (c) 2010-2011, Red Hat, Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND RED HAT, INC. DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL RED HAT, INC. BE LIABLE
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* FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Author: Jan Friesse <jfriesse@redhat.com>
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*/
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#ifndef _UTIL_H_
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#define _UTIL_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "addrfunc.h"
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/*
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* Definitions
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*/
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/*
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* Number of nanoseconds in one milisecond
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*/
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#define UTIL_NSINMS 1000000.0
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/*
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* (4 bytes of pid) + (16 bytes of IPV6 addr) + 4 bytes of random data
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*/
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enum { CLIENTID_LEN = (4 + 16 + 4) };
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/*
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* (4 bytes of pid) + 12 bytes of random data
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*/
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enum { SESSIONID_LEN = (4 + 12) };
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/*
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* Functions
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*/
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extern double util_fabs(double n);
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extern void util_gen_cid(char *client_id, const struct ai_item *local_addr);
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extern void util_gen_sid(char *session_id);
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extern struct timeval util_get_time(void);
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extern void util_random_init(const struct sockaddr_storage *local_addr);
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extern uint64_t util_time_absdiff(struct timeval t1, struct timeval t2);
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extern double util_time_double_absdiff(struct timeval t1, struct timeval t2);
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extern double util_time_double_absdiff_ns(struct timeval t1, struct timeval t2);
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extern double util_time_double_absdiff_us(struct timeval t1, struct timeval t2);
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extern double util_ov_std_dev(double m2, uint64_t n);
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extern void util_ov_update(double *mean, double *m2, double x, uint64_t n);
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extern double util_ov_variance(double m2, uint64_t n);
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extern uint64_t util_tv_to_ms(struct timeval t1);
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extern uint64_t util_u64_absdiff(uint64_t u1, uint64_t u2);
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extern uint32_t util_u64sqrt(uint64_t n);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _UTIL_H_ */
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