2007-11-25 03:18:42 +00:00
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.\" 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 Joseph Koshy ``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 Joseph Koshy 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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.\" $FreeBSD$
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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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2010-04-14 19:08:06 +00:00
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.Os
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2007-11-25 03:18:42 +00:00
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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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.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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.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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.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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