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Command: isset | Section: 9 | Source: NetBSD | File: isset.9
SETBIT(9) FreeBSD Kernel Developer's Manual SETBIT(9)
NAME
setbit - macros related to bitmaps
SYNOPSIS
#include <sys/param.h>
void
setbit(array, x);
void
clrbit(array, x);
int
isset(array, x);
int
isclr(array, x);
DESCRIPTION
The setbit family of macros operate with bitmaps, also known as bit
arrays.
In a nutshell, setbit() sets the bit x in array, clrbit() clears it,
isset() tests whether x is set, and isclr() returns 1 if x is not set.
EXAMPLES
The following example declares a buffer of 10 chars, treating it as an
array of 80 bits:
char buf[10];
...
setbit(buf, 12); /* set the fifth bit in the second byte */
SEE ALSO
bitmap(3), bitstring(3)
CAVEATS
The number of valid bits in a given array is assumed to be multiple of
CHAR_BIT, the number of bits for smallest object that is not a bit-field.
FreeBSD 14.1-RELEASE-p8 December 4, 2012 FreeBSD 14.1-RELEASE-p8