ffs man page on CentOS

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FFS(3)			   Linux Programmer's Manual			FFS(3)

NAME
       ffs - find first bit set in a word

SYNOPSIS
       #include <strings.h>

       int ffs(int i);

       #define _GNU_SOURCE
       #include <string.h>

       int ffsl(long int i);

       int ffsll(long long int i);

DESCRIPTION
       The  ffs()  function  returns the position of the first (least signifi‐
       cant) bit set in the word i.  The least significant bit is  position  1
       and  the	 most  significant  position  e.g.  32	or 64.	 The functions
       ffsll() and ffsl() do the same but take arguments of possibly different
       size.

RETURN VALUE
       These  functions	 return	 the position of the first bit set, or 0 if no
       bits are set in i.

CONFORMING TO
       4.3BSD, POSIX.1-2001.

NOTES
       BSD systems have a prototype in <string.h>.

GNU				  2003-08-05				FFS(3)
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