|ffs(3)||find first bit set in a bit string|
|ffs, fls, flsl(9)||kernel library find bit routines|
|FFS(3)||Library Functions Manual||FFS(3)|
ffs — find first
bit set in a bit string
function finds the first bit set in value and returns
the index of that bit. Bits are numbered starting from 1, starting at the
rightmost bit. A return value of 0 means that the argument was zero.
ffs() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).
ffs() function first appeared in
|August 30, 2019||OpenBSD-current|