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, -1 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() will, if no packets are currently available to be read, return 0 immediately rather than blocking waiting for packets to arrive. pcap_loop() and pcap_next() will not work in 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, -1 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.