ffs(3)                                                           ffs(3)

  ffs()

  NAME

    ffs() - find first bit set in a bit string

  SYNOPSIS

    #include 

    int ffs (int value)

  DESCRIPTION

    The ffs(3) 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.

  RETURN VALUES

    Ffs(3) returns the index to the first bit set; the right-most bit is
    numbered 1. A return value of 0 means that the argument was zero.

  USAGE NOTES

    The ffs function is thread safe.

    The ffs function is not async-signal safe.