April 2005
Intermediate to advanced
344 pages
11h 59m
English
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Name
pcap_loop — Prototype: int pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
Synopsis
Purpose: pcap_loop enters a loop for processing
cnt packets from the opened capture (live or saved
file). Unlike pcap_dispatch,
pcap_loop does not observe read timeouts. If
cnt is set to a negative number, the loop
continues forever. The function specified by
callback is the name of a function of the
prototype void
callback
(u_char
*user,
const
struct
pcap_pkthdr
*header,
const
u_char*
packet). This function is called for each packet
captured. The user parameter is a user-specifiable
value that is passed to the callback function when it is invoked, and
can be NULL. The function
pcap_loop returns 0 if
cnt packets were successfully read,
-1 on an error, and -2 if a
call to pcap_breakloop occurred before packets
have been captured. If an error has occurred, you can use
pcap_perror( ) or pcap_geterr( )
to obtain the error message. You can find an example of
using the pcap_loop function in the Section 10.2.5
section earlier in this chapter.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.