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FEATURE_PRESENT(3)	    Library Functions Manual	    FEATURE_PRESENT(3)

NAME
       feature_present -- query	presence of a kernel feature

LIBRARY
       Standard	C Library (libc, -lc)

SYNOPSIS
       #include	<unistd.h>

       int
       feature_present(const char *feature);

DESCRIPTION
       The  feature_present() function provides	a method for an	application to
       determine if a specific kernel feature is present in the	currently run-
       ning kernel.  The feature argument specifies the	name of	the feature to
       check.  The feature_present() function will return 1 if	the  specified
       feature	 is   present,	 otherwise   it	  will	 return	  0.   If  the
       feature_present() function is not able to  determine  the  presence  of
       feature due to an internal error	it will	return 0.

RETURN VALUES
       If feature is present then 1 is returned; otherwise 0 is	returned.

SEE ALSO
       sysconf(3), sysctl(3)

HISTORY
       The feature_present() function first appeared in	FreeBSD	8.0.

FreeBSD	13.5			January	8, 2008		    FEATURE_PRESENT(3)

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<https://man.freebsd.org/cgi/man.cgi?query=feature_present&sektion=3&manpath=FreeBSD+13.5-RELEASE+and+Ports>

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