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This page displays the COHERENT manpage for ffs() [Translate a bit mask into an integer value].

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ffs() -- Sockets Function (libsocket)

Translate a bit mask into an integer value
int mask (mask);

Function  ffs() translates  the bit  mask mask into  an integer  value.  It
returns the integer value of the first bit to be turned on (i.e., one, two,
three, etc.).  If no bit is turned on within mask, it returns zero.

See Also

libsocket

Notes

This function  is used  by a  number of X  programs that  manipulate fonts.
COHERENT includes it for compatibility with X11R6.