freebsd-dev/usr.bin/gcore/gcore.1

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.\" Copyright (c) 1983, 1990, 1992, 1993
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.\" @(#)gcore.1 8.2 (Berkeley) 4/18/94
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.\" $FreeBSD$
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.\"
.Dd April 18, 1994
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.Dt GCORE 1
.Os
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.Sh NAME
.Nm gcore
.Nd get core images of running process
.Sh SYNOPSIS
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.Nm
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.Op Fl s
.Op Fl c Ar core
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.Op Ar executable
.Ar pid
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.Sh DESCRIPTION
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The
.Nm
utility creates a core image of the specified process,
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suitable for use with
.Xr gdb 1 .
By default, the core is written to the file
.Dq Pa core.<pid> .
The process identifier,
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.Ar pid ,
must be given on the command line.
If no executable image is
specified,
.Nm
will use
.Dq Pa /proc/<pid>/file .
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.Pp
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The following options are available:
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.Bl -tag -width indent
.It Fl c
Write the core file to the specified file instead of
.Dq Pa core.<pid> .
.It Fl s
Stop the process while gathering the core image, and resume it
when done. This guarantees that the resulting core dump will
be in a consistent state. The process is resumed even if it was
already stopped.
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The same effect can be achieved manually with
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.Xr kill 1 .
.El
.Sh FILES
.Bl -tag -width /var/log/messages -compact
.It Pa core.<pid>
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the core image
.It Pa /proc/<pid>/file
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the executable image
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.El
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.Sh HISTORY
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A
.Nm
utility appeared in
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.Bx 4.2 .
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.Sh BUGS
Context switches or paging activity that occur while
.Nm
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is running may cause the program to become confused.
For best results, use
.Fl s
to temporarily stop the target process.
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.Pp
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The
.Nm
utility is not compatible with the original
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.Bx 4.2
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version.