netbsd man page for set

SET(9)							   BSD Kernel Developer's Manual						    SET(9)

NAME
     SET -- primitive bit macros

SYNOPSIS
     #include <sys/types.h>

     void
     SET(val, x);

     void
     ISSET(val, x);

     void
     CLR(val, x);

DESCRIPTION
     These macros define three standard bit-operations:

	   1.	SET() sets the bit x in val;

	   2.	CLR() clears the bit x in val; and

	   3.	ISSET() returns 1 if the bit x is set in val.

SEE ALSO
     bits(3)

BUGS
     The rationale is to provide clarity in the source code, but arguably these operations are clear enough without the use of the macros.

BSD
								  April 13, 2010							       BSD