ffs(9)

ffs9

Find first set bit in word

Usage

int ffs(int x);

Arguments

x

the word to search

Overview

This is defined the same way as the libc and compiler builtin ffs routines, therefore differs in spirit from the other bitops.

ffs(value) returns 0 if value is 0 or the position of the first set bit if value is nonzero. The first (least significant) bit is at position 1.

Releases

6 releases since Debian 4.0 (Etch); the text changed 5 times.

  1. 4.0
  2. 5.0
  3. 6.0
  4. 7
  5. 8
  6. 9

From linux-manual-4.9 4.9.228-1 in Debian 9 (Stretch). Parsed by carta from the page's man source.