12-21-2009
block it, instead of spot it ...
here's my two cents:
- as the easier/cheaper alternative, I would recommend using disk quotas in order to block the growing of the suspicious file, thus triggering a syslog event for quota-offenders ;
- now deeper (and way different) than that approach, a Dtrace probe to inspect the stat/lstat syscalls and the st_size value can spot your file, at the costs of some overhead to your overall performance, and some Dtrace programming ;
good luck, and success !
alexandre botao
<< botao {dot} org >>
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LEARN ABOUT MOJAVE
repquota
REPQUOTA(8) BSD System Manager's Manual REPQUOTA(8)
NAME
repquota -- summarize quotas for a file system
SYNOPSIS
repquota [-g] [-u] [-v] filesystem ...
repquota [-g] [-u] [-v] -a
DESCRIPTION
Repquota prints a summary of the disk usage and quotas for the specified file systems.
Available options:
-a Print the quotas of all the filesystems configured with a quota mount option file at its root.
-g Print only group quotas (the default is to print both group and user quotas if they exist).
-u Print only user quotas (the default is to print both group and user quotas if they exist).
-v Print a header line before printing each filesystem quotas.
For each user or group, the current number of files and amount of space (in kilobytes) is printed, along with any quotas created with
edquota(8).
Only members of the operator group or the super-user may use this command.
FILES
Each of the following quota files is located at the root of the mounted filesystem. The mount option files are empty files whose existence
indicates that quotas are to be enabled for that filesystem.
.quota.user data file containing user quotas
.quota.group data file containing group quotas
.quota.ops.user mount option file used to enable user quotas
.quota.ops.group mount option file used to enable group quotas
SEE ALSO
quota(1), quotactl(2), edquota(8), quotacheck(8), quotaon(8)
DIAGNOSTICS
Various messages about inaccessible files; self-explanatory.
HISTORY
The repquota command appeared in 4.2BSD.
4.2 Berkeley Distribution March 28, 2002 4.2 Berkeley Distribution