'\" te
.\" Copyright (c) 1992, Sun Microsystems, Inc.
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License.
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.  See the License for the specific language governing permissions and limitations under the License.
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.TH DUMP 9E "Oct 9, 2001"
.SH NAME
dump \- dump memory to device during system failure
.SH SYNOPSIS
.nf
#include <sys/types.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>



\fBint\fR \fBdump\fR(\fBdev_t\fR \fIdev\fR, \fBcaddr_t\fR \fIaddr\fR, \fBdaddr_t\fR \fIblkno\fR, \fBint\fR \fInblk\fR);
.fi

.SH INTERFACE LEVEL
illumos specific (illumos DDI). This entry point is \fBrequired\fR. For drivers
that do not implement \fBdump()\fR routines, \fBnodev\fR(9F) should be used.
.SH ARGUMENTS
.ne 2
.na
\fB\fIdev\fR \fR
.ad
.RS 10n
Device number.
.RE

.sp
.ne 2
.na
\fB\fIaddr\fR \fR
.ad
.RS 10n
Address for the beginning of the area to be dumped.
.RE

.sp
.ne 2
.na
\fB\fIblkno\fR \fR
.ad
.RS 10n
Block offset to dump memory.
.RE

.sp
.ne 2
.na
\fB\fInblk\fR \fR
.ad
.RS 10n
Number of blocks to dump.
.RE

.SH DESCRIPTION
\fBdump()\fR is used to dump a portion of virtual address space directly to a
device in the case of system failure. It can also be used for checking the
state of the kernel during a checkpoint operation. The memory area to be dumped
is specified by \fIaddr\fR (base address) and \fInblk\fR (length). It is dumped
to the device specified by \fIdev\fR starting at offset \fIblkno\fR. Upon
completion \fBdump()\fR returns the status of the transfer.
.sp
.LP
When the system is panicking, the calls of functions scheduled by
\fBtimeout\fR(9F) and \fBddi_trigger_softintr\fR(9F) will never occur. Neither
can delay(9F) be relied upon, since it is implemented via \fBtimeout()\fR. See
\fBddi_in_panic\fR(9F).
.sp
.LP
\fBdump()\fR is called at interrupt priority.
.SH RETURN VALUES
\fBdump()\fR returns \fB0\fR on success, or the appropriate error number.
.SH SEE ALSO
.BR cpr (4),
.BR nodev (9F)
.sp
.LP
\fIWriting Device Drivers\fR