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105 lines
3.3 KiB
Groff
105 lines
3.3 KiB
Groff
.\" Copyright (c) 1983, 1990, 1992, 1993
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.\" The Regents of the University of California. 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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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" @(#)gcore.1 8.2 (Berkeley) 4/18/94
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.\" $FreeBSD$
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.\"
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.Dd July 14, 2010
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.Dt GCORE 1
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.Os
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.Sh NAME
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.Nm gcore
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.Nd get core images of running process
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.Sh SYNOPSIS
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.Nm
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.Op Fl f
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.Op Fl s
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.Op Fl c Ar core
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.Op Ar executable
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.Ar pid
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.Sh DESCRIPTION
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The
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.Nm
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utility creates a core image of the specified process,
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suitable for use with
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.Xr gdb 1 .
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By default, the core is written to the file
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.Dq Pa core.<pid> .
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The process identifier,
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.Ar pid ,
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must be given on the command line.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl c
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Write the core file to the specified file instead of
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.Dq Pa core.<pid> .
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.It Fl f
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Dumps all available segments, excluding only malformed and undumpable segments.
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Unlike the default invocation, this flag dumps mappings of devices which
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may invalidate the state of device transactions or trigger other unexpected
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behavior.
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As a result, this flag should only be used when the behavior of the
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application and any devices it has mapped is fully understood and any side
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effects can be controlled or tolerated.
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.It Fl s
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Stop the process while gathering the core image, and resume it
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when done.
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This guarantees that the resulting core dump will
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be in a consistent state.
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The process is resumed even if it was
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already stopped.
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The same effect can be achieved manually with
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.Xr kill 1 .
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.El
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.Sh FILES
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.Bl -tag -width /var/log/messages -compact
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.It Pa core.<pid>
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the core image
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.El
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.Bx 4.2 .
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.Sh BUGS
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Because of the
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.Xr ptrace 2
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usage
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.Nm
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may not work with processes which are actively being investigated with
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.Xr truss 1
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or
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.Xr gdb 1 .
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Additionally, interruptable sleeps may exit with EINTR.
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.Pp
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The
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.Nm
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utility is not compatible with the original
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.Bx 4.2
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version.
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