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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 performed.
       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_NETMASK_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
       argument to fetch or display the error text.

       pcap(3), pcap_setfilter(3), pcap_freecode(3), pcap_geterr(3), pcap-

                                 7 April 2014                  PCAP_COMPILE(3)