GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
PCAP_OPEN_OFFLINE(3) FreeBSD Library Functions Manual PCAP_OPEN_OFFLINE(3)

pcap_open_offline, pcap_open_offline_with_tstamp_precision, pcap_fopen_offline, pcap_fopen_offline_with_tstamp_precision - open a saved capture file for reading

#include <pcap/pcap.h>

char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *pcap_open_offline(const char *fname, char *errbuf);
pcap_t *pcap_open_offline_with_tstamp_precision(const char *fname,
    u_int precision, char *errbuf);
pcap_t *pcap_fopen_offline(FILE *fp, char *errbuf);
pcap_t *pcap_fopen_offline_with_tstamp_precision(FILE *fp,
    u_int precision, char *errbuf);

pcap_open_offline() and pcap_open_offline_with_tstamp_precision() are called to open a ``savefile'' for reading.

fname specifies the name of the file to open. The file can have the pcap file format as described in pcap-savefile(5), which is the file format used by, among other programs, tcpdump(1) and tcpslice(1), or can have the pcapng file format, although not all pcapng files can be read. The name "-" is a synonym for stdin.

pcap_open_offline_with_tstamp_precision() takes an additional precision argument specifying the time stamp precision desired; if PCAP_TSTAMP_PRECISION_MICRO is specified, packet time stamps will be supplied in seconds and microseconds, and if PCAP_TSTAMP_PRECISION_NANO is specified, packet time stamps will be supplied in seconds and nanoseconds. If the time stamps in the file do not have the same precision as the requested precision, they will be scaled up or down as necessary before being supplied.

Alternatively, you may call pcap_fopen_offline() or pcap_fopen_offline_with_tstamp_precision() to read dumped data from an existing open stream fp. pcap_fopen_offline_with_tstamp_precision() takes an additional precision argument as described above. Note that on Windows, that stream should be opened in binary mode.

pcap_open_offline(), pcap_open_offline_with_tstamp_precision(), pcap_fopen_offline(), and pcap_fopen_offline_with_tstamp_precision() return a pcap_t * on success and NULL on failure. If NULL is returned, errbuf is filled in with an appropriate error message. errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.

pcap_open_offline_with_tstamp_precision and pcap_fopen_offline_with_tstamp_precision became available in libpcap release 1.5.1. In previous releases, time stamps from a savefile are always given in seconds and microseconds.

pcap(3), pcap-savefile(5)
8 January 2018

Search for    or go to Top of page |  Section 3 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.