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+.\" Copyright (c) 2007 Joseph Koshy.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 25, 2007
+.Dt PMC_GET_DRIVER_STATS 3
+.Os
+.Sh NAME
+.Nm pmc_get_driver_stats
+.Nd retrieve driver statistics
+.Sh LIBRARY
+.Lb libpmc
+.Sh SYNOPSIS
+.In pmc.h
+.Ft int
+.Fn pmc_get_driver_stats "struct pmc_driverstats *gms"
+.Sh DESCRIPTION
+The function
+.Fn pmc_get_driver_statistics
+retrieves a snapshot of the usage statistics maintained by
+.Xr hwpmc 4
+into the memory area pointed to by argument
+.Fa gms .
+.Pp
+The returned structure includes the following fields:
+.Bl -tag -width pmc_intr_bufferfull -offset indent -compact
+.It pm_intr_ignored
+The number of sampling interrupts ignored.
+.It pm_intr_processed
+The number of sampling interrupts processed.
+.It pm_intr_bufferfull
+The number of sampling interrupts dropped due to lack of space
+in the sample buffer.
+.It pm_syscalls
+The number of system calls into
+.Xr hwpmc 4 .
+.It pm_syscalls_errors
+The number of system calls into
+.Xr hwpmc 4
+that failed.
+.It pm_buffer_requests
+The number of log buffer requests so far.
+.It pm_buffer_requests_failed
+The number of log buffer requests that failed due to lack of buffers.
+.It pm_log_sweeps
+The number of sample buffer processing sweeps.
+.El
+.Sh RETURN VALUES
+.Rv -std
+.Sh SEE ALSO
+.Xr pmc 3 ,
+.Xr hwpmc 4