| core.5 (35934) | core.5 (37810) |
|---|---|
| 1.\" Copyright (c) 1980, 1991, 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. --- 16 unchanged lines hidden (view full) --- 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.\" @(#)core.5 8.3 (Berkeley) 12/11/93 | 1.\" Copyright (c) 1980, 1991, 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. --- 16 unchanged lines hidden (view full) --- 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.\" @(#)core.5 8.3 (Berkeley) 12/11/93 |
| 33.\" $Id: core.5,v 1.5 1997/02/22 13:25:57 peter Exp $ | 33.\" $Id: core.5,v 1.6 1998/05/11 03:41:51 steve Exp $ |
| 34.\" 35.Dd December 11, 1993 36.Dt CORE 5 37.Os BSD 4 38.Sh NAME 39.Nm core 40.Nd memory image file format 41.Sh SYNOPSIS 42.Fd #include <sys/param.h> 43.Sh DESCRIPTION 44A small number of signals which cause abnormal termination of a process 45also cause a record of the process's in-core state to be written 46to disk for later examination by one of the available debuggers. 47(See 48.Xr sigaction 2 . ) | 34.\" 35.Dd December 11, 1993 36.Dt CORE 5 37.Os BSD 4 38.Sh NAME 39.Nm core 40.Nd memory image file format 41.Sh SYNOPSIS 42.Fd #include <sys/param.h> 43.Sh DESCRIPTION 44A small number of signals which cause abnormal termination of a process 45also cause a record of the process's in-core state to be written 46to disk for later examination by one of the available debuggers. 47(See 48.Xr sigaction 2 . ) |
| 49This memory image is written to a file named | 49This memory image is written to a file named by default |
| 50.Nm programname.core 51in the working directory; 52provided the terminated process had write permission in the directory, 53and provided the abnormality did not cause 54a system crash. 55(In this event, the decision to save the core file is arbitrary, see 56.Xr savecore 8 . ) 57.Pp | 50.Nm programname.core 51in the working directory; 52provided the terminated process had write permission in the directory, 53and provided the abnormality did not cause 54a system crash. 55(In this event, the decision to save the core file is arbitrary, see 56.Xr savecore 8 . ) 57.Pp |
| 58The maximum size of a 59.Nm programname.core 60file is limited by | 58The maximum size of a core file is limited by |
| 61.Xr setrlimit 2 . 62Files which would be larger than the limit are not created. 63.Pp | 59.Xr setrlimit 2 . 60Files which would be larger than the limit are not created. 61.Pp |
| 64The 65.Nm programname.core 66file consists of the | 62The name of the file is controlled via the 63.Xr sysctl 8 64variable 65.Va kern.corefile . 66The contents of this variable describes a filename to store 67the core image to. This filename can be absolute, or relative (which 68will resolve to the current working directory of the program 69generating it). Any sequence of 70.Em \&%N 71in this filename template will be replaced by the process name, 72.Em \&%P 73by the processes PID, and 74.Em \&%U 75by the UID. The name defaults to 76.Em \&%N.core , 77yielding the traditional FreeBSD behaviour. 78.Pp 79The core file consists of the |
| 67.Fa u . 68area, whose size (in pages) is 69defined by the 70.Dv UPAGES 71manifest in the 72.Aq Pa sys/param.h 73file. The 74.Fa u . 75area starts with a 76.Fa user 77structure as given in 78.Aq Pa sys/user.h . | 80.Fa u . 81area, whose size (in pages) is 82defined by the 83.Dv UPAGES 84manifest in the 85.Aq Pa sys/param.h 86file. The 87.Fa u . 88area starts with a 89.Fa user 90structure as given in 91.Aq Pa sys/user.h . |
| 79The remainder of the 80.Nm programname.core | 92The remainder of the core |
| 81file consists of the data pages followed by 82the stack pages of the process image. | 93file consists of the data pages followed by 94the stack pages of the process image. |
| 83The amount of data space image in the 84.Nm programname.core | 95The amount of data space image in the core |
| 85file is given (in pages) by the 86variable 87.Fa u_dsize 88in the 89.Fa u . 90area. 91The amount of stack image in the core file is given (in pages) by the 92variable 93.Fa u_ssize 94in the 95.Ar u . 96area. 97The size of a ``page'' is given by the constant 98.Dv PAGE_SIZE 99(also from 100.Aq Pa sys/param.h ) . | 96file is given (in pages) by the 97variable 98.Fa u_dsize 99in the 100.Fa u . 101area. 102The amount of stack image in the core file is given (in pages) by the 103variable 104.Fa u_ssize 105in the 106.Ar u . 107area. 108The size of a ``page'' is given by the constant 109.Dv PAGE_SIZE 110(also from 111.Aq Pa sys/param.h ) . |
| 112.Sh EXAMPLES 113In order to store all core images in per-user private areas under 114.Pa /var/coredumps , 115the following 116.Xr sysctl 8 117command can be used: 118.Pp 119.Dl sysctl -w kern.corefile="/var/coredumps/\&%U/\&%N.core" |
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| 101.Sh SEE ALSO 102.Xr gdb 1 , 103.Xr kgdb 1 , 104.Xr setrlimit 2 , | 120.Sh SEE ALSO 121.Xr gdb 1 , 122.Xr kgdb 1 , 123.Xr setrlimit 2 , |
| 105.Xr sigaction 2 | 124.Xr sigaction 2 , 125.Xr sysctl 8 |
| 106.Sh HISTORY 107A 108.Nm core 109file format appeared in 110.At v6 . | 126.Sh HISTORY 127A 128.Nm core 129file format appeared in 130.At v6 . |