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FreeBSD 11.0 - man page for pcap_compile (freebsd section 3)

PCAP_COMPILE(3) 					     Library Functions Manual						   PCAP_COMPILE(3)

pcap_compile - compile a filter expression
#include <pcap/pcap.h> int pcap_compile(pcap_t *p, struct bpf_program *fp, const char *str, int optimize, bpf_u_int32 netmask);
pcap_compile() is used to compile the string str into a filter program. See pcap-filter(7) for the syntax of that string. program is a pointer to a bpf_program struct and is filled in by pcap_compile(). optimize controls whether optimization on the resulting code is per- formed. netmask specifies the IPv4 netmask of the network on which packets are being captured; it is used only when checking for IPv4 broadcast addresses in the filter program. If the netmask of the network on which packets are being captured isn't known to the program, or if packets are being captured on the Linux "any" pseudo-interface that can capture on more than one network, a value of PCAP_NET- MASK_UNKNOWN can be supplied; tests for IPv4 broadcast addresses will fail to compile, but all other tests in the filter program will be OK.
pcap_compile() returns 0 on success and -1 on failure. If -1 is returned, pcap_geterr() or pcap_perror() may be called with p as an argu- ment to fetch or display the error text.
pcap(3), pcap_setfilter(3), pcap_freecode(3), pcap_geterr(3), pcap-filter(7) 1 December 2009 PCAP_COMPILE(3)

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