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 February 2, 2019 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 sv 40.Op Fl c Ar core 41.Op Fl l Ar seglimit 42.Op Ar executable 43.Ar pid 44.Sh DESCRIPTION 45The 46.Nm 47utility creates a core image of the specified process, 48suitable for use with 49.Xr gdb 1 . 50By default, the core is written to the file 51.Dq Pa core.<pid> . 52The process identifier, 53.Ar pid , 54must be given on the command line. 55If no executable image is 56specified, 57.Nm 58will use 59.Dq Pa /proc/<pid>/file . 60.Pp 61The following options are available: 62.Bl -tag -width indent 63.It Fl c 64Write the core file to the specified file instead of 65.Dq Pa core.<pid> . 66.It Fl l Ar seglimit 67Tells gcore to skip map segments larger than the specified 68limit, in bytes. 69Specify a suffix 'k', 'm', 'g', or 't' for kilobytes, etc. 70Segments ignored due to the option will be reported. 71.It Fl s 72Stop the process while gathering the core image, and resume it 73when done. 74This guarantees that the resulting core dump will be in a consistent state. 75The process is resumed even if it was already stopped. 76The same effect can be achieved manually with 77.Xr kill 1 . 78.It Fl v 79Verbosely print out the map segments being dumped. 80.El 81.Sh FILES 82.Bl -tag -width /var/log/messages -compact 83.It Pa core.<pid> 84the core image 85.It Pa /proc/<pid>/file 86the executable image 87.El 88.Sh HISTORY 89A 90.Nm 91utility appeared in 92.Bx 4.2 . 93.Sh BUGS 94Context switches or paging activity that occur while 95.Nm 96is running may cause the program to become confused. 97For best results, use 98.Fl s 99to temporarily stop the target process. 100.Pp 101The 102.Nm 103utility is not compatible with the original 104.Bx 4.2 105version. 106