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SETBIT(9) NetBSD Kernel Developer's Manual SETBIT(9)
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setbit -- macros related to bitmaps
The setbit family of macros operate with bitmaps, also known as bit
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.
The following example declares a buffer of 10 chars, treating it as an
array of 80 bits:
setbit(buf, 12); /* set the fifth bit in the second byte */
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.
NetBSD 8.1 December 4, 2012 NetBSD 8.1