pcap_set_immediate_mode - set immediate mode for a not-yet-activated capture handle
int pcap_set_immediate_mode(pcap_t *p, int immediate_mode);
pcap_set_immediate_mode() sets whether immediate mode should be set on a capture handle when the handle is activated. In immediate mode, packets are always delivered as soon as they arrive, with no buffering. If immediate_mode is non-zero, immediate mode will be set, otherwise it will not be set.
pcap_set_immediate_mode() returns 0 on success or PCAP_ERROR_ACTIVATED if called on a capture handle that has been activated.
This function became available in libpcap release 1.5.0. In previous releases, if immediate delivery of packets is required:
On Linux, with previous releases of libpcap, capture devices are always in immediate mode; however, in 1.5.0 and later, they are, by default, not in immediate mode, so if pcap_set_immediate_mode() is available, it should be used.
On other platforms, capture devices are always in immediate mode.
pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)
|23 August 2018|