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• Shared Exchange Calendar View

  - by Mark A Johnson

  My department creates a shared calendar for everyone to enter their out-of-office times. This requires duplicate entry for those of us who keep all our info in our own Exchange calendar. Is there a way in Exchange to create a View that's simply a combination view of multiple users' calendars? For example, we would create a view with all the departments' users calendars combined, but only those marked "out of office". Ideally, the subject line would also include the user's name, but this would not be 100% necessary.

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• VMWare Workstation 8, Sharing a VM without copying them to "Shared VMs location"

  - by Stebi

  I have a host computer (Win7-64) with three different harddrives. It runs several VMs which are distributed among those harddrives for a better performance. Now with VMWare Workstation 8 it is possible to "share" the VMs. I'd like to use this feature, but I have to convert the VMs to "Shared VMs". When I try this WMWare forces me to copy the VMs to one predefined folder, thus making my effort of distributing the VMs among the harddrives meaningless. Is there any possibility to keep the VMs where they are and share them anyway?

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• Cygwin creates files with special (shared) icons on windows

  - by barjonah

  I use cygwin to transfer files between linux and windows machines. Everytime I transfer a file to a windows machine it adds an extra shared user icon on the file's or folder's icon itself. This also happens if I create a file from cygwin on windows using pretty much any command: echo, vim, nano, cat. This is what the cygwin-created folders (and files) look like. This is what a normal folder (or file) looks like. I'm thinking it has to do with permission, because I'd have to chmod it everytime if I want other applications to access the files or folders on windows. How can I tell cygwin to create regular ol' files just like a user or any program would?

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• Manipulating Exchange 2003 shared contacts folder remotely

  - by andybak

  I've got a CRM web app running on a remote server that needs to synchronise it's contacts with the in-house Exchange 2003 shared contacts. Exchange 2003 doesn't appear to support web services. What would the typical approach to this problem be? My initial instinct would be to open port 80 on the Exchange server, run a simple webserver, POST to it and then control Exchange via OLE automation scripting (if that's what people are still calling it!) but there might be a better solution I'm not aware of. Any suggestions?

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• Multiple iSCSI Targets or 1 that's shared?

  - by Joost Verdaasdonk

  On my network I have several types of files I want to save on a SAN like: SQL db's and logs Exchange data Random files Now I'm wondering if I should create one iSCSI Target with a large volume and initiate that from one of the servers. (and share it so other servers can use it too) Or I should create separate Targets to have each server use its own storage. For the record the storage could be separated because the servers aren't using the shared data. For one reason I was thinking of one storage is ease of backup. (but perhaps performance could be a problem?) What would be an advisable configuration for these type of data?

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• Accessing to shared folders with OpenVPN

  - by Ergec

  This is my first attempt to configure a vpn so I have very little knowledge about this. Network where centos server is having local IPs 192.168.123.* Network where windows machine is having local IPs 192.168.1.* I installed and configured my openpvn server on centos 5 and client on a windows machine. Generated all keys, certificates e.t.c and transferred them to client and I'm able to connect to server. Below there is a screenshot of the client log. Also on server side I can also see incoming packets with this command tcpdump -n port 1723 So I assume I did most of the things correct. But still when I try to open shared folders using \\192.168.123.33 or \\network-name I can't access folders

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• Shared printer can't be added

  - by Sandokan

  We have a small training network with server 2003, and XP clients and users in a AD domain. A printer is connected to a client with USB. We are trying to share the printer to all the users but it's not working. We come so far as the users can see the printer when they search for it. But when they try to add it, there appears a pop up window for user name and password. No matter what user name we try it doesn't work. We have checked the shared printer's security settings and they are all in order. Everyone has printer rights. But even with full rights it doesn't work. The only ones it works for are Domain Admins. Anyone have any ideas?

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• Cross domains sessions - shared shopping cart cross domains

  - by Jaroslav Moravec

  Hi, we are solving the problem with eshop (php, mysql). The client want to have the same eshop on two domains with shared shopping cart. In the shop customer can do the shopping without users account (can't be logged in). And there is the problem, how to make the shared shopping cart cross domain. The data from cart is stored in sessions, which we stored in database too. But we can't solve the problem in carrying data over domains. Identifying unlogged user is not holeproof (research). The example, how it should work Customer goes to domainOne and add some things to the cart. Than he goes to domainTwo (by link, typing domain address, however) and add some other things to the cart. In the cart he has things from both domains (after refreshing page). Do you have any idea, how to solve this problem? What didn't work: redirecting is not possible due to customer requirments cookies are related to domain set_cookie with the other domain didn't work the simpliest way is to carry over only the sessionid (stored in cookies) but we don't know, how to wholeproof identify unlogged users. is there any other place, where data can be stored on client side except cookies? (probably not) we can't use sending sessionid by params in url (if user click to link to the other domain) or resolving the header referer, bcs we don't know, how user can achieve the other domain. If you can't understand me, take me a question. If you think, that having eshop on two domains with shared (common) cart is bad idea, don't tell me, we know it. Thanks for each answer.

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• Porting - Shared Memory x32 & x64 processes

  - by dpb

  A 32 bit host Windows application setups shared memory (using memory mapped file / CreateFileMapping() API), and then other 32 bit client processes use this shared memory to communicate with each other. I am planning to port the host application to 64 bit platform and once it is ready, I intend that both 32 bit and 64 bit client processes should be able to use the shared memory setup by the main 64 bit host application. The original code written for host x32 application uses "size_t" almost everywhere, since this differs from 4 bytes to 8 bytes as we move from x32 to x64, I am looking for replacing it. I intend to replace "size_t" by "unsigned long long", so that its size will be same on 32 bit & 64 bit. Can you please suggest me better alternative? Also, will the use of "unsigned long long" have performance impact on x32 app .. i guess yes? Research Done - Found very useful articles - a) 20 issue in porting from 32 bit to 64 bit (www.viva64.com) b) No way to restrict/change "size_t" on x64 platform to 4 bytes using compiler flags or any hooks/crooks since it is typedef

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• PHP/MySQL - Working with two databases, one shared and one local to an instance of application

  - by Extrakun

  The situation: Using a off-the-shelf PHP application, I have to add in a new module for extra functionality. Today, it is made known that eventually four different instances of the application are to be deployed, but the data from the new functionality is to be shared among those 4 instances. Each instance should still have their own database for users, content and etc. So the data for the new functionality goes into a 'shared' database. The data for the application (user login, content, uploads) go into a 'local' database To make things more complex, the new module I am writing will fetch data from the local DB and the shared DB at the same time. A re-write of the base application will take too long. I only have control over the new module which I am writing. The ideal solution: Is there a way to encapsulate 2 databases into one name using MySQL? I do not wish to switch DB connections or specifically name the DB to query from inside my SQL statements. The application uses a DB wrapper, so I am able to change it somehow so I can invisibly attempt to read/write to two different DB. What is the best way to handle this problem?

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• iPhone toolbar shared by multiple views

  - by codemonkey

  Another iPhone noob question. The app I'm building needs to show a shared custom UIToolbar for multiple views (and their subviews) within a UITabBarController framework. The contents of the custom toolbar are the same across all the views. I'd like to be able to design the custom toolbar as a xib and handle UI events from its own controller class (I'm assuming I can subclass UIToolbar to do so?). That way I could define IBOutlet & IBAction items, etc. Then I could associate this custom toolbar with eachs of the UITabBarController views (and their subviews). But I'm having trouble finding out whether that's possible - and if so, how to do it. In particular, I want to be able to push new views onto UINavigationControllers that are each associated with parent UITabBarController tabs. So, to summarize, I want a: custom toolbar shared by multiple views which are managed by multiple navigation controllers and the navigation controllers are associated with different tabs of a parent tab bar controller The tab bar controller itself is launched modally, though I don't believe that's relevant. Anyway, the tab bar controller is working, as are its child navigation controllers. I'm just having a little trouble figuring out how to persist the shared toolbar to the various subviews. I'd settle for a good clean way of implementing programmatically... though I'd prefer the flexibility of keeping the toolbar's visual design in a xib. Anyone have any suggestions?

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• UnauthorizedAccessException when running desktop application from shared folder

  - by Atara

  I created a desktop application using VS 2008. When I run it locally, all works well. I shared my output folder (WITHOUT allowing network users to change my files) and ran my exe from another Vista computer on our intranet. When running the shared exe, I receive "System.UnauthorizedAccessException" when trying to read a file. How can I give permission to allow reading the file? Should I change the code? Should I grant permission to the application\folder on the Vista computer? how? Notes: I do not use ClickOnce. the application should be distributed using xcopy. My application target framework is ".Net Framework 2.0" On the Vista computer, "controlPanel | UninstallOrChangePrograms" it says it has "Microsoft .Net Framework 3.5 SP1" I also tried to map the folder drive, but got the same errors, only now the fileName is "T:\my.ocx" ' ---------------------------------------------------------------------- ' my code: Dim src As String = mcGlobals.cmcFiles.mcGetFileNameOcx() Dim ioStream As New System.IO.FileStream(src, IO.FileMode.Open) ' ---------------------------------------------------------------------- Public Shared Function mcGetFileNameOcx() As String ' ---------------------------------------------------------------------- Dim dirName As String = Application.StartupPath & "\" Dim sFiles() As String = System.IO.Directory.GetFiles(dirName, "*.ocx") Dim i As Integer For i = 0 To UBound(sFiles) Debug.WriteLine(System.IO.Path.GetFullPath(sFiles(i))) ' if found any - return the first: Return System.IO.Path.GetFullPath(sFiles(i)) Next Return "" End Function ' ---------------------------------------------------------------------- ' The Exception I receive: System.UnauthorizedAccessException: Access to the path '\\computerName\sharedFolderName\my.ocx' is denied. at System.IO._Error(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.Init(...) at System.IO.FileStream..ctor(...) at System.IO.FileStream..ctor(String path, FileMode mode) ' ----------------------------------------------------------------------

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• OSX - User home directories shared via NFS

  - by Hugh

  Hi, I've run into some problems with how I've got user home directories set up on our system here. Our server is an XServe, using Open Directory to manage the user accounts. The majority of our workstations are OSX, but there are a few running Linux (Centos 5.3), and, as time goes on, we expect the proportion of Linux workstations to increase (at some point, we expect to move the server side over to Linux too, but for now we're running with what we've already got) To ensure that the Linux and OSX workstations both see user's home directories in the same place, I shared the home directories using NFS. On the server end, the home directories are stored in: /Volumes/data/company_users This is mounted on the workstations to: /mount/company_users This work fine on the Linux workstations, but there is some weirdness under OSX. For the user who is logged in through the GUI, it all works just fine. However, if a user tries to SSH into a machine that they are not the primary user on, they often have no access to their own home directory. It looks as though OSX is trying to do something else to the user home directories mount point when you log in through the GUI.... For example, on this machine (nv001), I (hugh) am logged into the GUI. Last login: Mon Mar 8 18:17:52 on ttys011 [nv001:~] hugh% ls -al /mount/company_users total 40 drwxrwxrwx 26 hugh wheel 840 27 Jan 19:09 . drwxr-xr-x 6 admin admin 204 19 Dec 18:36 .. drwx------+ 128 hugh staff 4308 27 Feb 23:36 hugh drwx------+ 26 matt staff 840 4 Dec 14:14 matt [nv001:~] hugh% So Matt's home directory is accessible to him. However, if I try to switch to him: [nv001:~] hugh% su - matt Password: su: no directory [nv001:~] hugh% Or: [nv001:~] hugh% su matt Password: tcsh: Permission denied tcsh: Trying to start from "/mount/company_users/matt" tcsh: Trying to start from "/" [nv001:/] matt% Does anyone have any idea why it might be doing this? It's causing me all sorts of problems at the moment... The only machine that I can successfully switch users at the moment is the server that the user directories are stored on, where /mount/company_users is actually just a symlink to /Volumes/data/company_users Thanks

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• Mac OS X - User home directories shared via NFS

  - by Hugh

  I've run into some problems with how I've got user home directories set up on our system here. Our server is an XServe, using Open Directory to manage the user accounts. The majority of our workstations are OS X, but there are a few running Linux (Centos 5.3), and, as time goes on, we expect the proportion of Linux workstations to increase (at some point, we expect to move the server side over to Linux too, but for now we're running with what we've already got) To ensure that the Linux and OS X workstations both see user's home directories in the same place, I shared the home directories using NFS. On the server end, the home directories are stored in: /Volumes/data/company_users This is mounted on the workstations to: /mount/company_users This work fine on the Linux workstations, but there is some weirdness under OS X. For the user who is logged in through the GUI, it all works just fine. However, if a user tries to SSH into a machine that they are not the primary user on, they often have no access to their own home directory. It looks as though OS X is trying to do something else to the user home directories mount point when you log in through the GUI.... For example, on this machine (nv001), I (hugh) am logged into the GUI. Last login: Mon Mar 8 18:17:52 on ttys011 [nv001:~] hugh% ls -al /mount/company_users total 40 drwxrwxrwx 26 hugh wheel 840 27 Jan 19:09 . drwxr-xr-x 6 admin admin 204 19 Dec 18:36 .. drwx------+ 128 hugh staff 4308 27 Feb 23:36 hugh drwx------+ 26 matt staff 840 4 Dec 14:14 matt [nv001:~] hugh% So Matt's home directory is accessible to him. However, if I try to switch to him: [nv001:~] hugh% su - matt Password: su: no directory [nv001:~] hugh% Or: [nv001:~] hugh% su matt Password: tcsh: Permission denied tcsh: Trying to start from "/mount/company_users/matt" tcsh: Trying to start from "/" [nv001:/] matt% Does anyone have any idea why it might be doing this? It's causing me all sorts of problems at the moment... The only machine that I can successfully switch users at the moment is the server that the user directories are stored on, where /mount/company_users is actually just a symlink to /Volumes/data/company_users

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• Configuring OS X L2TP VPN to use Certificate for IPSEC layer instead of Pre Shared Key

  - by Matthew Savage

  I'm trying to setup a L2TP VPN on an OS X Snow Leopard Server setup, and have had success using a pre-shared key, however I would rather not rely on a simple string, and use a certificate instead. Setting this up on the server side is seemingly easy, you simply select a certificate you have generated from the list, and hit apply, however when I try to use the certificate on the client side it fails. I have exported the certificate into a P12 file, and then transferred to the client, and imported into the login keychain, however when I try to choose the certificate (from Network preferences, clicking Authentication Settings, then selecting Certificate and pressing Select) I am shown the following error: No machine certificates found Certificate authentication cannot be used because your keychain does not contain any suitable certificates. Use Keychain Access to import the certificate into your keychain. If you do not have the certificates required for authentication, contact your network administrator. Unfortunately even when I try to generate a certificate where I override the defaults, ensure the DNS name etc are set properly this doesn't change. When I select Certificate Authentication for the User Auth, and click Select the certificate for the server shows up there, but obviously this isn't where I need it to be available.

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• locked files on HFS+ home partition shared between OSX/Linux

  - by HazyBlueDot

  I dual boot into Arch Linux and OS X 10.6 on my MacBook pro. I synced my UID between both OSes and created an HFS partition (with no journaling) to use as a shared home/Users partition. For the most part it works just as I'd expect, but sometimes when I'm booted into OS X certain files are "locked" (when I get info on a particular file the "Locked" box is checked under the "General" pane. I can resolve the issue by manually unchecking the box) and/or I get "Operation not permitted" when I try deleting or chmod'ing a file. In both cases I don't see anything out of the ordinary on the permission bits displayed with ls -l, except for a trailing '@' character in the position where the sticky bit would normally occur: -rw-r--r--@ 1 myuser mygroup 296 Mar 29 11:44 myfile This '@' character shows up on ALL normal files, so doesn't seem to be linked to the locked/operation not permission situation. On the Linux side of things I never have permission problems. To the best of my limited knowledge and experience with ACLs I've not found any ACLs on any of the files in question. For what it's worth, I do most of my file editing using emacs (Aquamacs in OSX), is it possible it is setting weird permission bits? What is the "locked" setting that OS X uses and does it have a permission bit equivalent (so at the very least I could recursively unlock all files in my home directory from the terminal) why might some, but not other files get "locked" when booting into OS X what is the meaning of the '@' character?

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• Very slow browsing shared folder XP client/host

  - by Ickster

  I have a pretty straightforward setup where I'm storing media files on an XP pro machine, and sharing the folder to be accessed by other XP pro machines around the house. (Typically, there's only one client accessing the share at a time, although there may be several with the share mounted.) It's been working just fine for years, but I've recently started having some problems. A couple of days ago, the host PC had power disconnected while it was running. It was restarted and everything seemed fine initially, but since then browsing the shared folder from client machines has been extremely slow and actually reading data is all but impossible. The problem exists in every access method I've tried: Windows Explorer, VLC dialogs, command line, etc. My first thought was that the disk was experiencing problems, but there are no problems viewing the files locally on the host machine. My second thought was that there was a network problem on the host machine, so I removed and reinstalled drivers for the NIC with no change. My third thought was that there might've been a problem elsewhere on the network, so I swapped out hardware to no avail. I'm regrouping and trying to come up with a methodical approach to figuring out what might be wrong. I would of course be thrilled if you can suggest specific problems (Microsoft KB articles, etc.) that I might check, but I'm not expecting a silver bullet. If you can help me outline an approach to identify the problem (including recommended tools, e.g., disk checkers, network analyzers, etc.) I'd greatly appreciate it.

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• Shared printer hosted by Windows 7 to XP peers [closed]

  - by Alistair Knock

  Possible Duplicate: Add Network Printer drivers in Windows 7/Server 2008 R2? A Canon Pixma ip4600 installed all by itself when connected to a Windows 7-64 bit machine. I then updated it with the add-on Canon provide to give additional functionality. I then wish to share it with a box which is running Windows XP 32-bit. The XP box can see the printer but can't find a driver from the 7 machine, which is fine. I ask the 7 machine to get the x86 drivers, but it can't. I install the 32-bit XP drivers on the XP machine, but unlike previous Canon drivers (which unzip to give an .inf file), they assume a local printer and partially give up. I find the .inf file in the Program files\CanonBJ\... directory. Neither the XP machine, nor the 7 machine when the CanonBJ directory is shared to it, is happy with the .inf file. I attempt to install the 32-bit drivers on the 64-bit 7 machine, which, understandably, fail. Where do we go from here? (I apologise for posting in the first-person, I'm not sure why this was)

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• Set proper rights for sshfs mountpoint so it can be shared with samba

  - by CS01

  I have a domain hoster that provides access via SSH. My platforms are: Gentoo 2.6.36-r5 Windows (XP/Vista/7) I work on my Windows, I use Gentoo to do all the magic Windows can't do. Therefore I use sshfs to mount the remote public directory for my domain to /mnt/mydomain.com. Authentication is done via keys, so lazy me don't have to type in my password every now and then. Since I do my coding on Windows, and I don't want to upload/download the changed files all the time, I want to access this /mnt/mydomain.com via a samba share. So I shared /mnt in samba, all mounts except mydomain.com is listed on my Windows Explorer. My theories are: sshfs does not set the mountpoint uid/gid to something that samba expects samba does not know that it has to include the uid/gid that /mnt/mydomain.com has been set. All above is wrong, and I don't know. Here are configs and output from console, need anything else just let me know. Also no errors or warnings that I take notice of being relevant to this issue, but I might be wrong. gentoo ~ # ls -lah /mnt total 20K drwxr-xr-x 9 root root 4.0K Mar 26 16:15 . drwxr-xr-x 18 root root 4.0K Mar 26 2011 .. -rw-r--r-- 1 root root 0 Feb 1 16:12 .keep drwxr-xr-x 1 root root 0 Mar 18 12:09 buffer drwxr-s--x 1 68591 68591 4.0K Feb 16 15:43 mydomain.com drwx------ 2 root root 4.0K Feb 1 16:12 cdrom drwx------ 2 root root 4.0K Feb 1 16:12 floppy drwxr-xr-x 1 root root 0 Sep 1 2009 services drwxr-xr-x 1 root root 0 Feb 10 15:08 www /etc/samba/smb.conf [mnt] comment = Mount points writable = yes writeable = yes browseable = yes browsable = yes path = /mnt /etc/fstab sshfs#[email protected]:/home/to/pub/dir/ /mnt/mydomain.com/ fuse comment=sshfs,noauto,users,exec,uid=0,gid=0,allow_other,reconnect,follow_symlinks,transform_symlinks,idmap=none,SSHOPT=HostBasedAuthentication 0 0 For an easier read: [email protected] /home/to/pub/dir/ /mnt/mydomain.com/ options: comment=sshfs noauto users exec uid=0 gid=0 allow_other reconnect follow_symlinks transform_symlinks idmap=none SSHOPT=HostBasedAuthentication Help!

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• Set proper rights for sshfs mountpoint so it can be shared with samba

  - by CS01

  I have a domain hoster that provides access via SSH. My platforms are: Gentoo 2.6.36-r5 Windows (XP/Vista/7) I work on my Windows, I use Gentoo to do all the magic Windows can't do. Therefore I use sshfs to mount the remote public directory for my domain to /mnt/mydomain.com. Authentication is done via keys, so lazy me don't have to type in my password every now and then. Since I do my coding on Windows, and I don't want to upload/download the changed files all the time, I want to access this /mnt/mydomain.com via a samba share. So I shared /mnt in samba, all mounts except mydomain.com is listed on my Windows Explorer. My theories are: sshfs does not set the mountpoint uid/gid to something that samba expects samba does not know that it has to include the uid/gid that /mnt/mydomain.com has been set. All above is wrong, and I don't know. Here are configs and output from console, need anything else just let me know. Also no errors or warnings that I take notice of being relevant to this issue, but I might be wrong. gentoo ~ # ls -lah /mnt total 20K drwxr-xr-x 9 root root 4.0K Mar 26 16:15 . drwxr-xr-x 18 root root 4.0K Mar 26 2011 .. -rw-r--r-- 1 root root 0 Feb 1 16:12 .keep drwxr-xr-x 1 root root 0 Mar 18 12:09 buffer drwxr-s--x 1 68591 68591 4.0K Feb 16 15:43 mydomain.com drwx------ 2 root root 4.0K Feb 1 16:12 cdrom drwx------ 2 root root 4.0K Feb 1 16:12 floppy drwxr-xr-x 1 root root 0 Sep 1 2009 services drwxr-xr-x 1 root root 0 Feb 10 15:08 www /etc/samba/smb.conf [mnt] comment = Mount points writable = yes writeable = yes browseable = yes browsable = yes path = /mnt /etc/fstab sshfs#[email protected]:/home/to/pub/dir/ /mnt/mydomain.com/ fuse comment=sshfs,noauto,users,exec,uid=0,gid=0,allow_other,reconnect,follow_symlinks,transform_symlinks,idmap=none,SSHOPT=HostBasedAuthentication 0 0 For an easier read: [email protected] /home/to/pub/dir/ /mnt/mydomain.com/ options: comment=sshfs noauto users exec uid=0 gid=0 allow_other reconnect follow_symlinks transform_symlinks idmap=none SSHOPT=HostBasedAuthentication Help!

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• Shared Files stuck locked even after closing all sessions

  - by Chris S

  We run a business app from a shared network drive (has to be this way). When I go to do updates it complains that files are locked. Generally there are open sessions from people who left their computer on, but with no locks on files; there aren't necessarily always sessions open when it complains about locked files. If I close these sessions they disappear. I say "disappear" because I suspect they're actually hanging open. If I try to restart the Server service, it hangs on stopping. Restarting the whole server (it's a VM) unlocks the files. The Server is a Windows 2008 R2 Ent VM running on Hyper-V; the share is accessed through DFS. Offline Files and caching are disabled (Share and GPO). All clients are Win7. Nothing has SP1 yet. Any ideas on what causes the file locks to hang? Any ideas for a solution other than rebooting the server every time?

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• Can you force a crash if a write occurs to a given memory location with finer than page granularity?

  - by Joseph Garvin

  I'm writing a program that for performance reasons uses shared memory (alternatives have been evaluated, and they are not fast enough for my task, so suggestions to not use it will be downvoted). In the shared memory region I am writing many structs of a fixed size. There is one program responsible for writing the structs into shared memory, and many clients that read from it. However, there is one member of each struct that clients need to write to (a reference count, which they will update atomically). All of the other members should be read only to the clients. Because clients need to change that one member, they can't map the shared memory region as read only. But they shouldn't be tinkering with the other members either, and since these programs are written in C++, memory corruption is possible. Ideally, it should be as difficult as possible for one client to crash another. I'm only worried about buggy clients, not malicious ones, so imperfect solutions are allowed. I can try to stop clients from overwriting by declaring the members in the header they use as const, but that won't prevent memory corruption (buffer overflows, bad casts, etc.) from overwriting. I can insert canaries, but then I have to constantly pay the cost of checking them. Instead of storing the reference count member directly, I could store a pointer to the actual data in a separate mapped write only page, while keeping the structs in read only mapped pages. This will work, the OS will force my application to crash if I try to write to the pointed to data, but indirect storage can be undesirable when trying to write lock free algorithms, because needing to follow another level of indirection can change whether something can be done atomically. Is there any way to mark smaller areas of memory such that writing them will cause your app to blow up? Some platforms have hardware watchpoints, and maybe I could activate one of those with inline assembly, but I'd be limited to only 4 at a time on 32-bit x86 and each one could only cover part of the struct because they're limited to 4 bytes. It'd also make my program painful to debug ;)

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• How to pass parameters to manage_shared_memory.construct() in Boost.Interprocess

  - by recipriversexclusion

  I've stared at the Boost.Interprocess documentation for hours but still haven't been able to figure this out. In the doc, they have an example of creating a vector in shared memory like so: //Define an STL compatible allocator of ints that allocates from the managed_shared_memory. //This allocator will allow placing containers in the segment typedef allocator<int, managed_shared_memory::segment_manager> ShmemAllocator; //Alias a vector that uses the previous STL-like allocator so that allocates //its values from the segment typedef vector<int, ShmemAllocator> MyVector; int main(int argc, char *argv[]) { //Create a new segment with given name and size managed_shared_memory segment(create_only, "MySharedMemory", 65536); //Initialize shared memory STL-compatible allocator const ShmemAllocator alloc_inst (segment.get_segment_manager()); //Construct a vector named "MyVector" in shared memory with argument alloc_inst MyVector *myvector = segment.construct<MyVector>("MyVector")(alloc_inst); Now, I understand this. What I'm stuck is how to pass a second parameter to segment.construct() to specify the number of elements. The interprocess document gives the prototype for construct() as MyType *ptr = managed_memory_segment.construct<MyType>("Name") (par1, par2...); but when I try MyVector *myvector = segment.construct<MyVector>("MyVector")(100, alloc_inst); I get compilation errors. My questions are: Who actually gets passed the parameters par1, par2 from segment.construct, the constructor of the object, e.g. vector? My understanding is that the template allocator parameter is being passed. Is that correct? How can I add another parameter, in addition to alloc_inst that is required by the constructor of the object being created in shared memory? There's very little information other than the terse Boost docs on this.

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• `:Zone.Identifier` files keep on appearing in Windows XP virtual machine

  - by Jonathan Reno

  I have a Windows XP Home Edition guest and a Linux Mint 13 host. I use VirtualBox and the ~/Public directory is shared with the guest. It sometimes happens that I use IE on the guest system to download files (until I get a better Windows browser). All of the downloaded files go the the L:\ drive (the ~/Public directory). When they are finished downloading, Windows Explorer adds a :Zone.Identifier file for each file I download. When I extract a downloaded ZIP archive on the guest (on drive L:\), Windows creates a :Zone.Identifier file for every file in the extracted directory. This even occurs if I use the host to move a file to the ~/Public directory. The shared ~/Public directory is on an ext4 partition and the colon character is supposed to be illegal in file names in Windows, but not on the ext4 partition. Is there any way to stop Windows from putting all this rubbish on my filesystem? (I might have to create a shell script to clean up after Windows' act.) Here is what I see in Windows Explorer: By the way, if I were running a Mac OS X host (where colons are illegal file name characters) this would be even more horrendous.

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• Why do hosts prefer Linux to Windows Server?

  - by iconiK

  So far I see a HUGE majority of hosts provide only Linux shared hosting, providing Windows only to VPS (or even to only dedicated servers). Why is it so? While Windows is a lot more expensive than Linux (though it depends on a lot of factors, not just initial and support license cost), it also provides ASP.NET, IIS and of course, Microsoft SQL Server. I know in the past it might have been because of cPanel being Linux only but now they have a Windows version. But still, why is Linux predominantly used on shared hosting? PHP works on both systems. IIS can be (and probably is) faster. MySQL runs on both systems as well. cPanel has a Windows version. Python, Perl, Ruby, all run on Windows as well. You even have MS SQL Server Express, which I find more superior than MySQL in both speed and features. Access is there for low usage requirements, as is SQLite (which is so great for quick small stuff). And with PowerShell you have a good alternative to the Unix shell. EDIT: I am looking for common reasons, I realize each hosting company (and/or it's clients) may have different needs. This becomes very important when you get to VPS or Cloud which give you a full operating system to use.

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