April 19, 1994 FFS 3

### NAME

ffs - find first bit set in a bit string

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```int` ffs(```int value`)

### DESCRIPTION

The ffs(``) function finds the first bit set in ```value` and returns the index of that bit. Bits are numbered starting from 1, starting at the right-most bit. A return value of 0 means that the argument was zero.

### SEE ALSO

bitstring(3)

### HISTORY

The ffs(``) function appeared in 4.3BSD.