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)

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)