sk_unattached_filter_create(9) [centos man page]

SK_UNATTACHED_FILTER(9) 					 Linux Networking					   SK_UNATTACHED_FILTER(9)

NAME

       sk_unattached_filter_create - create an unattached filter

SYNOPSIS

       int sk_unattached_filter_create(struct sk_filter ** pfp, struct sock_fprog * fprog);

ARGUMENTS

       pfp
	   the unattached filter that is created

       fprog
	   the filter program

DESCRIPTION

       Create a filter independent of any socket. We first run some sanity checks on it to make sure it does not explode on us later. If an error
       occurs or there is insufficient memory for the filter a negative errno code is returned. On success the return is zero.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   SK_UNATTACHED_FILTER(9)

PCAP_COMPILE(3) 					     Library Functions Manual						   PCAP_COMPILE(3)

NAME

       pcap_compile - compile a filter expression

SYNOPSIS

       #include <pcap/pcap.h>

       int pcap_compile(pcap_t *p, struct bpf_program *fp,
	       const char *str, int optimize, bpf_u_int32 netmask);

DESCRIPTION

       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.

RETURN VALUE

       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.

SEE ALSO

       pcap(3), pcap_setfilter(3), pcap_freecode(3), pcap_geterr(3), pcap-filter(7)

								  1 December 2009						   PCAP_COMPILE(3)