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Block grace time: 00:01; Inode grace time: 00:01 Block limits File limits User used soft hard grace used soft hard grace ---------------------------------------------------------------------root -17676 0 0 4 0 0 chivas -80 1000 1500 10 15 20 anna -56 0 0 7 0 0 Listing 5-7. Summary of Quota Usage for All Groups [root@server ~]# repquota -ag *** Report for group quotas on device /dev/hda3 Block grace time: 7days; Inode grace time: 7days Block limits File limits Group used soft hard grace used soft hard grace ---------------------------------------------------------------------root -17676 0 0 4 0 0 chivas -80 0 0 10 100 150 anna -56 0 0 7 100 150

Interfaces may have properties and events, but not fields. An implementing class must implement a trivial property s get and set methods, or an event. This could occur by redeclaring the trivial property or event in the implementing class, as in Listing 9-6. Listing 9-6. Implementing Properties and Events // interface_properties_events.cpp using namespace System; interface class I { property int P1; event EventHandler^ E; property int P2 { int get(); void set(int v); } }; ref class R : I { int value; public: virtual property int P1; virtual event EventHandler^ E; virtual property int P2 { int get() { return value; } void set(int v) { value = v; } } };

It s not only excessive disk usage that can cause problems. Services can be disrupted if users bog down the system by running too many things, and eventually, the system could be rendered unusable for others. Luckily, you can also set resource limits on a user session. Resource limits are implemented via PAM (pluggable authentication modules). Though PAM is primarily an authentication mechanism, one of its modules, pam_limits, is responsible for applying resource limits to user sessions. These limits can be viewed and configured in /etc/security/limits.conf.

Figure 8-11. Receive Location Properties dialog box 3. Select FILE from the Transport Type drop-down list, as shown in Figure 8-12. After selecting the File adapter, you ll notice that Receive Pipeline option has been automatically set as PassThruReceive. Coincidentally, that s the value you want.

Note: For more information on PAM, check http://en.wikipedia.org/wiki/Pluggable_ Authentication_Modules.

Name conflicts can occur between interface methods and class methods or between methods in multiple interfaces being implemented by the same class. In the case of a class that has a method conflict with an interface, you use the explicit implementation syntax you saw in the previous chapter to specify which method implements the interface method (see Listing 9-7).

The syntax of setting a resource limit is: <username|@groupname|*> <soft|hard> <resource limit> <value> The first property can be a username or group, which means the resource limit will either affect a user or a whole group. If for the limit applies to a user, just supply the username; if it s for a group, prefix the group name with an at sign (@). An asterisk (*) would denote all users are affected by this resource limit. The second property specifies whether the resource limit is a soft limit or a hard limit. On the soft limit, the user is warned by the system resource limit has been exceeded. The hard limit, on the other hand, is the maximum resource limit, and when a user attempts to exceed this limit, the system logs this behavior and prevents the requested action from taking place. The <resource limit> specifies what limitations you can set, such as maximum CPU time, file size, the number of simultaneous logins, and number of processes. Finally, the <value> property specifies the maximum value of the resource limit.

Let s try setting a couple of resource limitations. For example, if you want to limit the maximum logins of the staff group to two, you can do this by adding this limit: @staff hard maxlogins 2 If you would like to limit the login time for a user, juan, to 1 hour, you may do so by adding a limit to maximum CPU time in minutes like so: juan hard cpu 60 To limit maximum memory allocated to the staff group to 2 MB, you can set the resource limit memlock in kilobytes as follows: @staff hard memlock 2048

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