source: lib/format_helper.c @ 8184acc

/*
 * This file is part of libtrace
 *
 * Copyright (c) 2004 The University of Waikato, Hamilton, New Zealand.
 * Authors: Daniel Lawson 
 *          Perry Lorier 
 *          
 * All rights reserved.
 *
 * This code has been developed by the University of Waikato WAND 
 * research group. For further information please see http://www.wand.net.nz/
 *
 * libtrace 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.
 *
 * libtrace 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 libtrace; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id$
 *
 */

#include "libtrace.h"
#include "libtrace_int.h"

#ifdef HAVE_INTTYPES_H
#  include <inttypes.h>
#else
#  error "Can't find inttypes.h - this needs to be fixed"
#endif
#include  "format_helper.h"

#include <sys/ioctl.h>
/*
int trace_read(struct libtrace_t *libtrace, void *buffer, size_t len) {
        int numbytes;
        static short lctr = 0;
        int rlen;
        assert(libtrace);
        assert(len >= 0);

        if (buffer == 0)
                buffer = malloc(len);

        while(1) {
                switch(libtrace->sourcetype) {
                        case DEVICE:
                                if ((numbytes=read(INPUT.fd, 
                                                                buffer, 
                                                                len)) == -1) {
                                        perror("read");
                                        return -1;
                                }
                                break;
                        default:
#if HAVE_ZLIB
                                if ((numbytes=gzread(INPUT.file,
                                                                buffer,
                                                                len)) == -1) {
                                        perror("gzread");
                                        return -1;
                                }
#else
                                if ((numbytes=fread(buffer,len,1,
                                        INPUT.file)) == 0 ) {
                                        if(feof(INPUT.file)) {
                                                return 0;
                                        }
                                        if(ferror(INPUT.file)) {
                                                perror("fread");
                                                return -1;
                                        }
                                        return 0;
                                }
#endif
                }
                break;
        }
        return numbytes;

}
*/

struct libtrace_eventobj_t trace_event_device(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
        struct libtrace_eventobj_t event;
        int data;

        if (packet->trace->format->get_fd) {
                event.fd = packet->trace->format->get_fd(packet);
        } else {
                event.fd = 0;
        }
        if (ioctl(event.fd,FIONREAD,&data)==-1) {
                perror("ioctl(FIONREAD)");
        }
        if (data>0) {
                event.size = trace_read_packet(trace,packet);
                event.type = TRACE_EVENT_PACKET;
                return event;
        }
        event.type= TRACE_EVENT_IOWAIT;
        return event;
}

struct libtrace_eventobj_t trace_event_trace(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
        struct libtrace_eventobj_t event;
        double ts;
        double now;
        struct timeval stv;

        if (!trace->event.packet.buffer) {
                trace->event.packet.buffer = malloc(4096);
                trace->event.packet.size=
                        trace_read_packet(trace,packet);
                event.size = trace->event.packet.size;
                if (trace->event.packet.size > 0 ) {
                        memcpy(trace->event.packet.buffer,
                                        packet->buffer,
                                        trace->event.packet.size);
                } else {
                        // return here, the test for
                        // event.size will sort out the error
                        event.type = TRACE_EVENT_PACKET;
                        return event;
                }
        }

        ts=trace_get_seconds(packet);
        if (trace->event.tdelta!=0) {
                // Get the adjusted current time
                gettimeofday(&stv, NULL);
                now = stv.tv_sec + 
                        ((double)stv.tv_usec / 1000000.0);
                // adjust for trace delta
                now -= trace->event.tdelta; 

                //if the trace timestamp is still in the 
                //future, return a SLEEP event, 
                //otherwise fire the packet
                if (ts > now) {
                        event.seconds = ts - 
                                trace->event.trace_last_ts;
                        event.type = TRACE_EVENT_SLEEP;
                        return event;
                }
        } else {
                gettimeofday(&stv, NULL);
                // work out the difference between the 
                // start of trace replay, and the first
                // packet in the trace
                trace->event.tdelta = stv.tv_sec + 
                        ((double)stv.tv_usec / 1000000.0);
                trace->event.tdelta -= ts;
        }

        // This is the first packet, so just fire away.
        packet->size = trace->event.packet.size;
        memcpy(packet->buffer,
                        trace->event.packet.buffer,
                        trace->event.packet.size);
        free(trace->event.packet.buffer);
        trace->event.packet.buffer = 0;
        event.type = TRACE_EVENT_PACKET;

        trace->event.trace_last_ts = ts;

        return event;
        
}