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45 lines
2.1 KiB
Plaintext
45 lines
2.1 KiB
Plaintext
README file for directory ./util of the NTP Version 4 distribution
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This directory contains the sources for the various utility programs.
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See the README and RELNOTES files in the parent directory for directions
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on how to make and install these programs.
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The ntptime.c program checks the kernel configuration for the NTP user
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interface syscalls ntp_gettime() and ntp_adjtime(). If present, the
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current timekeeping data are displayed. If not, a dissapointment is
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displayed. See the kernel page file in the HTML documentation in
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distribution for further details. ntptime will be built be if configure
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believes your system can use it.
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The jitter.c program can be used to determine the timing jitter due to
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the operating system in a gettimeofday() call. For most systems the
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dominant contribution to the jitter budget is the period of the hardware
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interrupt, usually in the range 10 us-1 ms. For those systems with
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microsecond counters, such as recent Sun and certain HP and DEC systems,
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the jitter is dominated only by the operating system.
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The timetrim.c program can be used with SGI machines to implement a
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scheme to discipline the hardware clock frequency. See the source code
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for further information.
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The byteorder.c and longsize.c programs are used during the configuration
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process to determine the byte order (little or big endian) and longword
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size (32 or 64 bits). See the configure scripts for further details.
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The testrs6000.c program is used for testing purposes with the IBM
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RS/6000 AIX machines. Bill Jones <jones@chpc.utexas.edu> reports:
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"I could not get a tickadj of less than 40 us to work on a RS6000.
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If you set it less than 40 us do so at your own risk!"
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The tickadj.c program can be used to read and set various kernel
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parameters affecting NTP operations. See the tickadj page in the HTML
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documentation for further details. tickadj will be built if configure
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believes your system can use it.
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tg.c and tg2.c are tone generators. They make audio signals
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that emulate WWV or IRIG (-B and -E). tg runs on Solaris.
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tg2 is a clone that runs on Linux, FreeBSD, and NetBSD.
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Read the source for the fine print. tg2 has a help option
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available via -h.
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