1.\" Copyright (c) 1983, 1990, 1992, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)gcore.1 8.2 (Berkeley) 4/18/94 29.\" $FreeBSD: src/usr.bin/gcore/gcore.1,v 1.8.2.5 2002/07/15 06:25:27 keramida Exp $ 30.\" 31.Dd April 18, 1994 32.Dt GCORE 1 33.Os 34.Sh NAME 35.Nm gcore 36.Nd get core images of running process 37.Sh SYNOPSIS 38.Nm 39.Op Fl s 40.Op Fl c Ar core 41.Op Ar executable 42.Ar pid 43.Sh DESCRIPTION 44The 45.Nm 46utility creates a core image of the specified process, 47suitable for use with 48.Xr gdb 1 . 49By default, the core is written to the file 50.Dq Pa core.<pid> . 51The process identifier, 52.Ar pid , 53must be given on the command line. 54If no executable image is 55specified, 56.Nm 57will use 58.Dq Pa /proc/<pid>/file . 59.Pp 60The following options are available: 61.Bl -tag -width indent 62.It Fl c 63Write the core file to the specified file instead of 64.Dq Pa core.<pid> . 65.It Fl s 66Stop the process while gathering the core image, and resume it 67when done. This guarantees that the resulting core dump will 68be in a consistent state. The process is resumed even if it was 69already stopped. 70The same effect can be achieved manually with 71.Xr kill 1 . 72.El 73.Sh FILES 74.Bl -tag -width /var/log/messages -compact 75.It Pa core.<pid> 76the core image 77.It Pa /proc/<pid>/file 78the executable image 79.El 80.Sh HISTORY 81A 82.Nm 83utility appeared in 84.Bx 4.2 . 85.Sh BUGS 86Context switches or paging activity that occur while 87.Nm 88is running may cause the program to become confused. 89For best results, use 90.Fl s 91to temporarily stop the target process. 92.Pp 93The 94.Nm 95utility is not compatible with the original 96.Bx 4.2 97version. 98