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

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