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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)gcore.1 8.2 (Berkeley) 4/18/94 33.\" $FreeBSD$ 34.\" 35.Dd July 14, 2010 36.Dt GCORE 1 37.Os 38.Sh NAME 39.Nm gcore 40.Nd get core images of running process 41.Sh SYNOPSIS 42.Nm 43.Op Fl f 44.Op Fl s 45.Op Fl c Ar core 46.Op Ar executable 47.Ar pid 48.Sh DESCRIPTION 49The 50.Nm 51utility creates a core image of the specified process, 52suitable for use with 53.Xr gdb 1 . 54By default, the core is written to the file 55.Dq Pa core.<pid> . 56The process identifier, 57.Ar pid , 58must be given on the command line. 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 f 66Dumps all the available segments, excluding only the malformed ones and 67un-dumpable ones. Unlike the default invocation, it also dumps 68device- and sglist-mapped areas that may invalidate the state of 69some transactions. This flag must be used very carefully, when the 70behavior of the application is fully understood and the fallouts can 71be easily controlled. 72.It Fl s 73Stop the process while gathering the core image, and resume it 74when done. 75This guarantees that the resulting core dump will 76be in a consistent state. 77The process is resumed even if it was 78already stopped. 79The same effect can be achieved manually with 80.Xr kill 1 . 81.El 82.Sh FILES 83.Bl -tag -width /var/log/messages -compact 84.It Pa core.<pid> 85the core image 86.El 87.Sh HISTORY 88A 89.Nm 90utility appeared in 91.Bx 4.2 . 92.Sh BUGS 93Because of the 94.Xr ptrace 2 95usage 96.Nm 97may not work with processes which are actively investigated with 98.Xr truss 1 99or 100.Xr gdb 1 . 101Additionally, interruptable sleeps may exit with EINTR. 102.Pp 103The 104.Nm 105utility is not compatible with the original 106.Bx 4.2 107version. 108