From 96084e1a1f2e0a49c961bbddb9fffd2e03bfae3f Mon Sep 17 00:00:00 2001 From: "/C=EU/ST=EU/CN=Pablo Neira Ayuso/emailAddress=pablo@netfilter.org" Date: Mon, 9 Jul 2007 19:11:53 +0000 Subject: - conntrack-tools requires libnetfilter_conntrack >= 0.0.81 - add len field to nethdr - implement buffered send/recv to batch messages - stop using netlink format for network messages: use similar TLV-based format - reduce synchronization messages size up to 60% - introduce periodic alive messages for sync-nack protocol - timeslice alarm implementation: remove alarm pthread, remove locking - simplify debugging functions: use nfct_snprintf instead - remove major use of libnfnetlink functions: use libnetfilter_conntrack API - deprecate conntrackd -F, use conntrack -F instead - major rework of the network infrastructure: much simple, less messy --- src/timer.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 src/timer.c (limited to 'src/timer.c') diff --git a/src/timer.c b/src/timer.c new file mode 100644 index 0000000..b85c286 --- /dev/null +++ b/src/timer.c @@ -0,0 +1,75 @@ +/* + * (C) 2006-2007 by Pablo Neira Ayuso + * + * This program 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 of the License, or + * (at your option) any later version. + * + * This program 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; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include +#include +#include +#include "conntrackd.h" +#include "timer.h" + +#define TIMESLICE_CREDIT (1000000 / STEPS_PER_SECONDS) /* 200 ms timeslice */ + +void timer_init(struct timer *timer) +{ + memset(timer, 0, sizeof(struct timer)); + timer->credits = TIMESLICE_CREDIT; +} + +void timer_start(struct timer *timer) +{ + gettimeofday(&timer->start, NULL); +} + +static int timeval_subtract(struct timeval *diff, + struct timeval *start, + struct timeval *stop) +{ + diff->tv_sec = stop->tv_sec - start->tv_sec; + diff->tv_usec = stop->tv_usec - start->tv_usec; + + if (diff->tv_usec < 0) { + diff->tv_usec += 1000000; + diff->tv_sec--; + } + + /* Return 1 if result is negative. */ + return diff->tv_sec < 0; +} + +void timer_stop(struct timer *timer) +{ + gettimeofday(&timer->stop, NULL); + timeval_subtract(&timer->diff, &timer->start, &timer->stop); +} + +int timer_adjust_credit(struct timer *timer) +{ + if (timer->diff.tv_sec != 0) { + timer->credits = TIMESLICE_CREDIT; + return 1; + } + + timer->credits -= timer->diff.tv_usec; + + if (timer->credits < 0) { + timer->credits += TIMESLICE_CREDIT; + if (timer->credits < 0) + timer->credits = TIMESLICE_CREDIT; + return 1; + } + return 0; +} -- cgit v1.2.3