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sk_chk_filter(9) [centos man page]

SK_CHK_FILTER(9)						 Linux Networking						  SK_CHK_FILTER(9)

NAME
sk_chk_filter - verify socket filter code SYNOPSIS
int sk_chk_filter(struct sock_filter * filter, unsigned int flen); ARGUMENTS
filter filter to verify flen length of filter DESCRIPTION
Check the user's filter code. If we let some ugly filter code slip through kaboom! The filter must contain no references or jumps that are out of range, no illegal instructions, and must end with a RET instruction. All jumps are forward as they are not signed. Returns 0 if the rule set is legal or -EINVAL if not. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SK_CHK_FILTER(9)

Check Out this Related Man Page

RTF_CREATE_BANDPASS_ANALYTIC(3) 				 rtfilter library				   RTF_CREATE_BANDPASS_ANALYTIC(3)

NAME
rtf_create_bandpass_analytic - Creates an IIR filter estimating the analytic signal in a bandpass. SYNOPSIS
#include <rtf_common.h> hfilter rtf_create_bandpass_analytic(unsigned int nch, int proctype, double fl, double fh, unsigned int num_pole); DESCRIPTION
rtf_create_chebychev() creates a IIR chebychev filter processing nch channels of data type specified by proctype. The output of the filter is the analytic signal of the bandpassed data between the normalized frequencies fl and fh. The num_pole parameter specifies the number of poles of the Chebychev filter used as the basis of the analytic filter. A normalized frequency is the ratio between the absolute frequency and the sampling frequency (i.e. a value of 1.0 refers to the sampling frequency). The Z-transform of this filter has complex coefficients. So like rtf_create_filter(3) the created filter will output complex values keeping the precision specified by proctype. It is important to note that this filter can quickly become unstable as the number of pole specified increased. Please refers to the authors of the library to know the stability domain (TODO: provides the stability domain here) RETURN VALUE
Returns the handle to the created filter in case of success, NULL otherwise. SEE ALSO
rtf_create_filter(3), rtf_destroy_filter(3) EPFL
2010 RTF_CREATE_BANDPASS_ANALYTIC(3)

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