freebsd man page for feature_present

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