source: lib/format_helper.c @ 3d4d52d

4.0.1-hotfixescachetimestampsdevelopdpdk-ndagetsilivegetfragoffhelplibtrace4ndag_formatpfringrc-4.0.1rc-4.0.2rc-4.0.3rc-4.0.4ringdecrementfixringperformanceringtimestampfixes
Last change on this file since 3d4d52d was 3d4d52d, checked in by Perry Lorier <perry@…>, 16 years ago

Abstract away opening up traces into a single trace_open_trace that's more
simple and reliable.

  • Property mode set to 100644
File size: 4.2 KB
Line 
1/*
2 * This file is part of libtrace
3 *
4 * Copyright (c) 2004 The University of Waikato, Hamilton, New Zealand.
5 * Authors: Daniel Lawson
6 *          Perry Lorier
7 *         
8 * All rights reserved.
9 *
10 * This code has been developed by the University of Waikato WAND
11 * research group. For further information please see http://www.wand.net.nz/
12 *
13 * libtrace is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * libtrace is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with libtrace; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
26 *
27 * $Id$
28 *
29 */
30
31#include "libtrace.h"
32#include "libtrace_int.h"
33#include "config.h"
34
35#include <stdlib.h>
36#include <stdio.h>
37#include <string.h>
38#include <errno.h>
39#include <fcntl.h> /* for O_LARGEFILE */
40#ifdef HAVE_INTTYPES_H
41#  include <inttypes.h>
42#else
43#  error "Can't find inttypes.h - this needs to be fixed"
44#endif
45#include  "format_helper.h"
46
47#include <sys/ioctl.h>
48
49struct libtrace_eventobj_t trace_event_device(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
50        struct libtrace_eventobj_t event = {0,0,0.0,0};
51        int data;
52
53        if (packet->trace->format->get_fd) {
54                event.fd = packet->trace->format->get_fd(packet);
55        } else {
56                event.fd = 0;
57        }
58        if (ioctl(event.fd,FIONREAD,&data)==-1) {
59                event.type = TRACE_EVENT_TERMINATE;
60                return event;
61        }
62        if (data>0) {
63                event.size = trace_read_packet(trace,packet);
64                event.type = TRACE_EVENT_PACKET;
65                return event;
66        }
67        event.type= TRACE_EVENT_IOWAIT;
68        return event;
69}
70
71struct libtrace_eventobj_t trace_event_trace(struct libtrace_t *trace, struct libtrace_packet_t *packet) {
72        struct libtrace_eventobj_t event = {0,0,0.0,0};
73        double ts;
74        double now;
75        struct timeval stv;
76
77        if (!trace->event.packet.buffer) {
78                trace->event.packet.buffer = (void *)malloc(4096);
79                trace->event.packet.size=
80                        trace_read_packet(trace,packet);
81                event.size = trace->event.packet.size;
82                if (trace->event.packet.size > 0 ) {
83                        memcpy(trace->event.packet.buffer,
84                                        packet->buffer,
85                                        trace->event.packet.size);
86                } else {
87                        /* return here, the test for
88                         * event.size will sort out the error
89                         */
90                        event.type = TRACE_EVENT_TERMINATE;
91                        return event;
92                }
93        }
94
95        ts=trace_get_seconds(packet);
96        if (trace->event.tdelta!=0) {
97                /* Get the adjusted current time */
98                gettimeofday(&stv, NULL);
99                now = stv.tv_sec + 
100                        ((double)stv.tv_usec / 1000000.0);
101                /* adjust for trace delta */
102                now -= trace->event.tdelta; 
103
104                /*if the trace timestamp is still in the
105                //future, return a SLEEP event,
106                //otherwise fire the packet
107                 */
108                if (ts > now) {
109                        event.seconds = ts - 
110                                trace->event.trace_last_ts;
111                        event.type = TRACE_EVENT_SLEEP;
112                        return event;
113                }
114        } else {
115                gettimeofday(&stv, NULL);
116                /* work out the difference between the
117                // start of trace replay, and the first
118                // packet in the trace
119                 */
120                trace->event.tdelta = stv.tv_sec + 
121                        ((double)stv.tv_usec / 1000000.0);
122                trace->event.tdelta -= ts;
123        }
124
125        /* This is the first packet, so just fire away. */
126        packet->size = trace->event.packet.size;
127        memcpy(packet->buffer,
128                        trace->event.packet.buffer,
129                        trace->event.packet.size);
130        free(trace->event.packet.buffer);
131        trace->event.packet.buffer = 0;
132        event.type = TRACE_EVENT_PACKET;
133
134        trace->event.trace_last_ts = ts;
135
136        return event;
137       
138}
139
140/* Catch undefined O_LARGEFILE on *BSD etc */
141#ifndef O_LARGEFILE
142#  define O_LARGEFILE 0
143#endif
144
145LIBTRACE_FILE trace_open_file(libtrace_t *trace)
146{
147        int fd;
148        LIBTRACE_FILE ret;
149
150
151        if (strcmp(trace->uridata,"-")==0) {
152                ret=LIBTRACE_FDOPEN(fileno(stdin),"r");
153                return ret;
154        }
155
156        /* We open the file with open(2), so we can provide O_LARGEFILE
157         * as zlib doesn't always do it itself
158         */
159        fd=open(trace->uridata,O_LARGEFILE);
160        if (fd==-1) {
161                trace_set_err(errno,"Unable to open %s",trace->uridata);
162                return 0;
163        }
164        ret=LIBTRACE_FDOPEN(fd,"r");
165        return ret;
166}
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