xtt(ADM)                        19 June 1992                        xtt(ADM)


 Name

    xtt - extract and print xt driver packet traces

 Syntax

    xtt [ -f ] [ -o ]

 Description

    The xtt command is a debugging tool for the xt(HW) driver.  It performs
    an XTIOCTRACE ioctl(S) call on its standard input file to turn on tracing
    and extract the circular packet trace buffer for the attached group of
    channels.  This call will fail if tracing has not been configured in the
    driver, or the standard input is not attached to an xt(HW) channel.  The
    packets are printed on the standard output.

    The optional flags are:

    -f   Causes a ``formfeed'' character to be put out at the end of the out-
         put for the benefit of page-display programs.

    -o   Turns off further driver tracing.

 Diagnostics

    Returns 0 upon successful completion; 1 otherwise.

 Note

    If driver tracing has not been turned on for the terminal session by
    invoking layers(C) with the -t option, xtt will not generate any output
    the first time it is executed.

 See also

    ioctl(S), layers(C), layers(M), xt(HW), xtd(ADM), xts(ADM),