diff options
Diffstat (limited to 'share/man/man5/core.5')
| -rw-r--r-- | share/man/man5/core.5 | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/share/man/man5/core.5 b/share/man/man5/core.5 index e8a1653..a5fefc0 100644 --- a/share/man/man5/core.5 +++ b/share/man/man5/core.5 @@ -32,7 +32,7 @@ .\" @(#)core.5 8.3 (Berkeley) 12/11/93 .\" $FreeBSD$ .\" -.Dd November 22, 2012 +.Dd October 5, 2015 .Dt CORE 5 .Os .Sh NAME @@ -126,6 +126,29 @@ Core files will have the suffix .Em .gz appended to them. .El +.Sh NOTES +Corefiles are written with open file descriptor information as an ELF note. +By default, file paths are packed to only use as much space as needed. +However, file paths can change at any time, including during core dump, +and this can result in truncated file descriptor data. +.Pp +All file descriptor information can be preserved by disabling packing. +This potentially wastes up to PATH_MAX bytes per open fd. +Packing is disabled with +.Dl sysctl kern.coredump_pack_fileinfo=0 . +.Pp +Similarly, corefiles are written with vmmap information as an ELF note, which +contains file paths. +By default, they are packed to only use as much space as +needed. +By the same mechanism as for the open files note, these paths can also +change at any time and result in a truncated note. +.Pp +All vmmap information can be preserved by disabling packing. +Like the file information, this potentially wastes up to PATH_MAX bytes per +mapped object. +Packing is disabled with +.Dl sysctl kern.coredump_pack_vmmapinfo=0 . .Sh EXAMPLES In order to store all core images in per-user private areas under .Pa /var/coredumps , |
