01-01-2009
In addition to cjcox advice.
You could intercept the editor and script a flag file to show that the file is being edited and then stop edits if the flag file exists. The flag method used by unix command "vipw" to prevent two "vipw" users editing the password file at the same time.
Depending on how the file is being edited you may find unix command "fuser" useful. It is however no good for editor processes which don't open the file for write (e.g. vi).
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vipw(1B) SunOS/BSD Compatibility Package Commands vipw(1B)
NAME
vipw - edit the password file
SYNOPSIS
/usr/ucb/vipw
DESCRIPTION
vipw edits the password file while setting the appropriate locks, and does any necessary processing after the password file is unlocked. If
the password file is already being edited, then you will be told to try again later. The vi(1) editor will be used unless the environment
variable VISUAL or EDITOR indicates an alternate editor.
vipw performs a number of consistency checks on the password entry for root, and will not allow a password file with a "mangled" root entry
to be installed. It also checks the /etc/shells file to verify the login shell for root.
FILES
/etc/ptmp
/etc/shells
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
passwd(1), vi(1), passwd(4), attributes(5)
SunOS 5.10 14 Sep 1992 vipw(1B)