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FreeBSD 11.0 - man page for feature_present (freebsd section 3)

FEATURE_PRESENT(3)					   BSD 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 running kernel. The feature argument specifies the name of the feature to check. The feature_present() function will return 1 if the speci- fied 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.
BSD
January 8, 2008 BSD