---
name: "ffz"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/ffz"
---

# ffz(9)

find first zero bit in word

## NAME

ffz - find first zero bit in word

## SYNOPSIS

**unsigned long ffz(unsigned long** *word***);**

## ARGUMENTS

*word*

The word to search

## DESCRIPTION

Undefined if no zero exists, so code should check against ~0UL first.

## COPYRIGHT