pcap_setfilter(3) - NetBSD Manual Pages

PCAP_SETFILTER(3)                                            PCAP_SETFILTER(3)




NAME
pcap_setfilter - set the filter
SYNOPSIS
#include <pcap/pcap.h> int pcap_setfilter(pcap_t *p, struct bpf_program *fp);
DESCRIPTION
pcap_setfilter() is used to specify a filter program. fp is a pointer to a bpf_program struct, usually the result of a call to pcap_compile(3).
RETURN VALUE
pcap_setfilter() returns 0 on success, PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been created but not activated, or PCAP_ERROR on other errors. If PCAP_ERROR is returned, pcap_geterr(3) or pcap_perror(3) may be called with p as an argument to fetch or dis- play the error text.
SEE ALSO
pcap(3) 5 March 2022 PCAP_SETFILTER(3)

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