SK_CHK_FILTER(9) Linux Networking SK_CHK_FILTER(9)NAME
sk_chk_filter - verify socket filter code
int sk_chk_filter(struct sock_filter * filter, unsigned int flen);
filter to verify
length of filter
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)
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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.
hfilter rtf_create_bandpass_analytic(unsigned int nch, int proctype,
double fl, double fh,
unsigned int num_pole);
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
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)
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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