132 lines
3.5 KiB
Groff
132 lines
3.5 KiB
Groff
.\" Copyright (c) 2007 Joseph Koshy. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd November 24, 2007
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.Dt PMC_CONFIGURE_LOGFILE 3
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.Os
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.Sh NAME
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.Nm pmc_configure_logfile ,
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.Nm pmc_flush_logfile ,
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.Nm pmc_writelog ,
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.Nm pmc_close_logfile
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.Nd log file management
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.Sh LIBRARY
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.Lb libpmc
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.Sh SYNOPSIS
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.In pmc.h
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.Ft int
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.Fn pmc_configure_logfile "int fd"
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.Ft int
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.Fn pmc_flush_logfile void
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.Ft int
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.Fn pmc_writelog "uint32_t userdata"
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.Ft int
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.Fn pmc_close_logfile void
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.Sh DESCRIPTION
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The functions manage logging of
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.Xr hwpmc 4
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events.
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.Pp
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Function
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.Fn pmc_configure_logfile
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is used to turn on and turn off logging.
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If argument
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.Fa fd
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is a valid file handle returned by a prior call to
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.Xr open 2
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or
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.Xr socket 2
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then performance events will be logged to the file corresponding
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to the specified handle.
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If the value of argument
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.Fa fd
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is -1 then logging will be stopped after any pending data is flushed.
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.Pp
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Function
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.Fn pmc_flush_logfile
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will force all log data queued inside the
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.Xr hwpmc 4
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driver to be written out.
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.Pp
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Function
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.Fn pmc_writelog
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will append a log entry containing the value of argument
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.Fa userdata
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to the log file.
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.Pp
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Function
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.Fn pmc_close_logfile
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will flush all pending log data and close
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.Xr hwpmc 4 Ns Ap s
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side of the stream.
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.Sh RETURN VALUES
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.Rv -std
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.Sh ERRORS
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A call to
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.Fn pmc_configure_logfile
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may fail with the following errors:
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.Bl -tag -width Er
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.It Bq Er EAGAIN
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The
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.Xr hwpmc 4
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driver was not able to create a helper process due to system limits
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being reached.
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.It Bq Er EBUSY
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Function
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.Fn pmc_configure_logfile
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was called with a log file already configured.
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.It Bq Er EINVAL
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Function
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.Fn pmc_configure_logfile
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was called with an argument of -1 without a log file being previously
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configured.
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.It Bq Er ENOMEM
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The system encountered a memory shortage when servicing this request.
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.El
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.Pp
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A call to
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.Fn pmc_flush_logfile
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may fail with the following errors:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Function
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.Fn pmc_flush_logfile
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was called without a log file being previously configured.
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.El
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.Pp
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A call to
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.Fn pmc_writelog
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may fail with the following errors:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Function
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.Fn pmc_writelog
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was called without a log file being previously configured.
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.It Bq Er ENOMEM
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The system encountered a memory shortage when servicing this
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request.
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.El
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.Sh SEE ALSO
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.Xr pmc 3 ,
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.Xr hwpmc 4
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