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pcap_setnonblock(3pcap)

25 July 2018
Aliases: pcap_getnonblock(3pcap), pcap_getnonblock(3pcap), pcap_getnonblock(3pcap)

libpcap0.8-dev

development library and header files for libpcap0.8

libpcap

A system-independent interface for user-level packet capture

libpcap-devel

Libraries and header files for the libpcap library

NAME

pcap_setnonblock, pcap_getnonblock - set or get the state of non-blocking mode on a capture device

SYNOPSIS

#include <pcap/pcap.h>

char errbuf[PCAP_ERRBUF_SIZE];
int pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf); int pcap_getnonblock(pcap_t *p, char *errbuf);

DESCRIPTION

pcap_setnonblock() puts a capture handle into ‘‘non-blocking’’ mode, or takes it out of ‘‘non-blocking’’ mode, depending on whether the nonblock argument is non-zero or zero. It has no effect on ‘‘savefiles’’. If there is an error, PCAP_ERROR is returned and errbuf is filled in with an appropriate error message; otherwise, 0 is returned. In ‘‘non-blocking’’ mode, an attempt to read from the capture descriptor with pcap_dispatch(3PCAP) will, if no packets are currently available to be read, return 0 immediately rather than blocking waiting for packets to arrive. pcap_loop(3PCAP) and pcap_next(3PCAP) will not work in ‘‘non-blocking’’ mode.
When first activated with pcap_activate(3PCAP) or opened with pcap_open_live(3PCAP) , a capture handle is not in ‘‘non-blocking mode’’; a call to pcap_setnonblock() is required in order to put it into ‘‘non-blocking’’ mode.

RETURN VALUE

pcap_getnonblock() returns the current ‘‘non-blocking’’ state of the capture descriptor; it always returns 0 on ‘‘savefiles’’. If there is an error, PCAP_ERROR is returned and errbuf is filled in with an appropriate error message.
errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.
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