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• Portable C++ library for IPC (processes and shared memory), Boost vs ACE vs Poco?

  - by user363778

  Hi, I need a portable C++ library for doing IPC. I used fork() and SysV shared memory until now but this limits me to Linux/Unix. I found out that there are 3 major C++ libraries that offer a portable solution (including Windows and Mac OS X). I really like Boost, and would like to use it but I need processes and it seems like that this is only an experimental branch until now!? I have never heard of ACE or POCO before and thus I am stuck I do not know which one to choose. I need fork(), sleep() (usleep() would be great) and shared memory of course. Performance and documentation are also important criteria. Thanks, for your Help!

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• svn diff including annotate/blame-alike information of when changes where made by who

  - by Wouter Coekaerts

  Can you add annotate/blame-alike information to svn diff, so that for every changed line it includes which user and revision changed that line? For example, an annotate-diff comparing revisions 8-10 could output something like: 9 user1 - some line that user1 deleted in revision 9 10 user2 + some line that user2 added in revision 10 The context, lines around it which haven't changed, may be included as well or not, doesn't matter. It's not just a matter of "quickly" writing a shell script combining the output of svn diff and svn annotate. annotate for example will never show you who removed a line. It's also not a matter of doing annotate on a revision in the past: We're not interested in who originally added the line that got removed (that's not the one who "caused" the diff), we want to know who removed it. I suspect the only way to implement something to do this is to inspect each and every commit between the two revisions being compared (and somehow map all the changes in the separate diffs to lines in the total diff)... Does there exist a tool that does something like that?

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• Hash 32bit int to 16bit int?

  - by dkamins

  What are some simple ways to hash a 32-bit integer (e.g. IP address, e.g. Unix time_t, etc.) down to a 16-bit integer? E.g. hash_32b_to_16b(0x12345678) might return 0xABCD. Let's start with this as a horrible but functional example solution: function hash_32b_to_16b(val32b) { return val32b % 0xffff; } Question is specifically about JavaScript, but feel free to add any language-neutral solutions, preferably without using library functions. Simple = good. Wacky+obfuscated = amusing.

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• Does openssl errno 104 mean that SSLv2 is disabled?

  - by David

  I want to check if my server has SSLv2 disabled. I am doing this by attempting to connect remotely with openssl with the following shell command. openssl s_client -connect HOSTNAME:443 -ssl2 Most literature I could find on the Internet says if I see something similar to the following error then SSLv2 is properly disabled. 29638:error:1407F0E5:SSL routines:SSL2_WRITE:ssl handshake failure:s2_pkt.c:428: I do get the above error when connecting to my Ubuntu server with SSLv2 disabled in Apache Apache but when I connect to my Windows Server 2008 R2 server with SSLv2 disabled in the registry I get the following output and error. CONNECTED(00000003) write:errno=104 I can't find any literature explaining this output and error. If anybody could explain to me if and why this output and error means that SSLv2 is properly disabled, I would appreciate it. Thanks!

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• telling java to accept self-signed ssl certificate

  - by Nikita Rybak

  It looks like a standard question, but I couldn't find clear directions anywhere. I have java code trying to connect server with probably self-signed (or expired) certificate. It gives something like this [HttpMethodDirector] I/O exception (javax.net.ssl.SSLHandshakeException) caught when processing request: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target As I understand, I have to play around with keytool and tell java that it's ok to allow this connection. But all comments I've found assume I'm fully proficient with keytool, like "generate private key for server and import it into keystore". And I'm not. Is there anybody who could post detailed instructions? I'm running unix, so bash script would be best. Not sure if it's important, but code executed in jboss. Thanks a lot!

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• Which operating systems book should I go for?

  - by pecker

  Hi, I'm in a confusion. For our course (1 year ago) I used Stallings. I read it. It was fine. But I don't own any operating system's book. I want to buy a book on operating systems. I'm confused!! which one to pick? Modern Operating Systems (3rd Edition) ~ Andrew S. Tanenbaum (Author) Operating System Concepts ~ Abraham Silberschatz , Peter B. Galvin, Greg Gagne Operating Systems: Internals and Design Principles (6th Edition) ~ William Stallings I've plans of getting into development of realworld operating systems : Linux, Unix & Windows Driver Development. I know that for each of these there are specific books available. But I feel one should have a basic book on the shelf. So, which one to go for?

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• Cygwin/Git Bizarre Terminal Issue

  - by emptyset

  Alright, this is weird. First off, this is mintty running on up-to-date cygwin, with git pulled from cygwin's setup.exe. I am running zsh. $ git clone https://<user>@<domain>/<repository>/ ~/src/project/dev Initialized empty Git repository in /cygdrive/c/src/project/dev/.git/ Password: <actual password in plain text appears> # Nothing happens... ^C $ <password text that I just typed> zsh: command not found: <same password text> What is going on here? Is this a terminal problem, a shell problem, a git problem, or a cygwin problem? Update: Yes, I'm running the Cygwin git version, not the Windows version: $ which git /usr/bin/git $ git --version git version 1.7.1 $ /cygdrive/c/Program\ Files\ \(x86\)/Git/bin/git.exe --version git version 1.7.0.2.msysgit.0

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• Why powershell runs executables in separate window?

  - by Artem Tikhomirov

  On one of my servers (2008 R2) powershell refuses to run executables without extension, so typing cmd (or &cmd) in command prompt results in folowing error message: The term 'cmd' is not recognized as the name of a cmdlet Invoking executable one of the following ways pops out separate window (which executes asynchronously in respect to parent). I've tried that in x86 version of powershell and in x64 one. I've tried -Noprofile argument. PATH seems to be OK. It includes System32 and all. The only way I've managed to execute cmd inline form powershell is opening standard cmd.exe shell, executing powershell.exe from it and executing cmd /c echo test from it. Inception, huh? What should I try next?

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• Facebook links to my site resolve as 403 forbidden

  - by filip

  Hi I'm experiencing a super weird problem. Whenever I post links to my website on Facebook, they come up as Forbidden. The site itself works great and I have no seen this when linking on other sites. Could this be a server misconfiguration? Any thoughts on where to look? here's some Info: I have a dedicated server running WHM 11.25.0 i have 2 sites hosted here using cPanel 11.25.0 the error msg: Forbidden You don't have permission to access / on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at ---- Port 80

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• Why are all Linux commands broken after installing Perl?

  - by user115079

  I installed perl using following command: curl -L http://xrl.us/installperlnix | bash after that i run following command to create soft link ln -sf /usr/local/bin/perl /usr/bin/perl now I'm trying to run commands like dir, mkdir, ll, rm, vi but nothing seems to be working for me. also when i try to login into my shell i get following msg at startup: Last login: Wed Apr 4 21:50:12 2012 from x.y.z.ip -bash: perl: command not found please help. Here is system detail: cat /proc/version Linux version 2.6.18-274.18.1.el5.028stab098.1 (root@rhel5-build-x64) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) #1 SMP Sat Feb 11 15:30:41 MSK 2012 cat /etc/issue CentOS 5.7 32 bit Kernel \r on an \m Don't know if perl was already installed or not. and now i can't check.

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• How do I give MacPorts privileges?

  - by cojadate

  I tried to install PostgreSQL server development libraries using MacPorts and got the following: Warning: MacPorts running without privileges. You may be unable to complete certain actions (e.g. install). ---> Computing dependencies for postgresql-server-devel ---> Dependencies to be installed: postgresql-devel ---> Building postgresql-devel Error: Target org.macports.build returned: shell command failed Error: The following dependencies failed to build: postgresql-devel Error: Status 1 encountered during processing. To report a bug, see <http://guide.macports.org/#project.tickets> So I guess that means I need to running MacPorts with privileges and try again. Unfortunately I've no idea how to give MacPorts privileges. I'm running OS X 10.6.3

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• Thread safety of Matlab engine API

  - by Jeremy

  I have discovered through trial and error that the MATLAB engine function is not completely thread safe. Does anyone know the rules? Discovered through trial and error: On Windows, the connection to MATLAB is via COM, so the COM Apartment threading rules apply. All calls must occur in the same thread, but multiple connections can occur in multiple threads as long as each connection is isolated. From the answers below, it seems that this is not the case on UNIX, where calls can be made from multiple threads as long as the calls are made serially.

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• Java RandomAccessFile - dealing with different newline styles?

  - by waitinforatrain

  Hey, I'm trying to seek through a RandomAccessFile, and as part of an algorithm I have to read a line, and then seek backwards from the end of the line E.g String line = raf.readLine(); raf.seek (raf.getFilePointer() - line.length() + m.start() + m.group().length()); //m is a Matcher for regular expressions I've been getting loads of off-by-one errors and couldn't figure out why. I just discovered it's because some files I'm reading from have UNIX-style linefeeds, \r\n, and some have just windows-style \n. Is there an easy to have the RandomAccessFile treat all linefeeds as windows-style linefeeds?

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• Understanding the Linux boot process, subsystem initialization, & udev rules?

  - by quack quixote

  I'm creating UDEV rules for automounting external drives on a headless server, much in the same way as Gnome-VFS does automounting during a user session. I'm concerned with the rule's behavior at boot-time. There's a good chance one of these drives will be connected during a boot, and I'd prefer any connected drives get mounted in the right place. The drives might be either USB or Firewire, and they are mounted from a shell script fired off by UDEV on detecting an "add". Here are my questions: When UDEV runs the mount for these devices at boot, will the system be ready to mount it? Or will the script get triggered too early? If it's too early, what's a good way for a script to tell that the system isn't ready yet (so sleep a while before checking again)? The UDEV rule matches ACTION=="add". Does this event even fire at system boot?

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• C: Compiling GNU Projects on Windows

  - by Shiftbit

  I would like to port a few applications that I use on Linux to Windows. In particular I have been working on wdiff. A program that compares the differences word by word of two files. Currently I have been able to successfully compile the program on windows through Cygwin. However, I would like to run the program natively on Windows similar to the Project: UnixUtils. How would I go about porting unix utilities on a windows environment? My possible guess it to manually create the ./configure file so that I can create a proper makefile. Am I on the right track? Has anyone had experience porting GNU software to windows?

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• Sane(r) way to get character-encoding of CLI?

  - by danyowdee

  Hi all! I was writing a CLI-Tool for Mac OS X (10.5+) that has to deal with command-line arguments which are very likely to contain non-ASCII characters. For further processing, I convert these arguments using +[NSString stringWithCString:encoding:]. My problem is, that I couldn't find good information on how to determine the character-encoding used by the shell in which said cli-tool is running in. What I came up with as a solution is the following: NSDictionary *environment = [[NSProcessInfo processInfo] environment]; NSString *ianaName = [[environment objectForKey:@"LANG"] pathExtension]; NSStringEncoding encoding = CFStringConvertEncodingToNSStringEncoding( CFStringConvertIANACharSetNameToEncoding( (CFStringRef)ianaName ) ); NSString *someArgument = [NSString stringWithCString:argv[someIndex] encoding:encoding]; I find that a little crude, however -- which makes me think that I missed out something obvious...but what? Is there a saner/cleaner way of achieving essentially the same? Thanks in advance D

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• bash disable line wrap without truncation

  - by Eric Huang

  I am using a template heavy library in c++ and need to understand the template errors. Reading line wrapped template errors is a serious pain. Is there a way to disable line wrapping in bash without also truncating the output. Additionally, is there a way to do horizontal scrolling on the output. I have seen this answer, how to make bash not to wrap output?, but the output is truncated. The solution doesn't have to be bash targeted, if there is method for this using another shell, tmux, piping make output to another program, compiling from within vim, etc, I'll use it. (Except for copy-pasting into gedit)

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• How can I allow a linux subversion user to only execute svnserve?

  - by sbleon

  I've got a user that I'd like to only be able to use subversion. We like to use svn+ssh:// URLs sometimes (for public keys and whatnot), so I need them to be able to connect over ssh and run only the svnserve command. When using a svn+ssh URL, svn ssh'es in and passes the arguments "-c svnserve -t". I wrote a custom shell as follows to filter the commands that can be run. This works, but it's not passing the input to svnserve, so when I try to "svn up" I get "svn: Connection closed unexpectedly". #!/bin/bash if [ "$1" == "-c" ] && [ "$2" == "svnserve" ] && [ "$3" == "-t" ] && [ "$4" == ""] ; then exec svnserve -t else echo "Access denied. User may only run svnserve." fi

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• DD-WRT login does not work on Linux in Virtualbox

  - by superuser

  I am running on Windows 8 and installed Lubuntu 13.04 in VirtualBox. I cannot login to DD-WRT in Virtualbox. I can login to DD-WRT on Windows 8. I have used the same credentials and tried many times, but to no avail. How can I login successfully to DD-WRT in VirtualBox? I have even tried searching on the Internet but I could not find any relevant solutions. Additional Information: Using Chromium ( I have tried it on Firefox and it does not work ) Enabled secure shell: but it still does not work. If you require more information, please kindly make a comment below.

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• How to associate the ".exe" extension to be opened with Mono?

  - by wuser

  I want to asssociate the .exe file extension to Mono (don't care about wine). Apparently, when using Finder's GUI, only .app files (application bundles) can be selected. But the Mono executable (/Libraries/Frameworks/Mono.Framework/Current/bin/mono) is no such bundle. I tried some AppleScript on run this_file do shell script "mono this_file &" end run but Finder's GUI still doesn't allow to associate that with .exe's. How to associate a specific file extension to a command-line application in Mac OS X?

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• Load Balancer recommendations

  - by delerious010

  I provide hosting service for about 250 clients to date, and this is increasing on a monthly basis. For each client, I have 2 "services" configured for L4 balancing / persistence .. one on port 80, another for port 443 which redirects to another internal port as well as 4 servers per service. This equates to a total of 500 "services" and 2000 "servers". I'm currently running with a couple CoyotePoint load balancers, and have had a look at some Barracudas but so far I'm really not impressed by those. Could anyone recommend some good load balancers which would be able to support this sort of load ? And which offer a good API, or shell access to automate management.

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• dmenu doesn't set environment variable as per my .bash_profile when running Emacs

  - by proofit404

  I have following ~/.bash_profile [[ -f ~/.bashrc ]] && . ~/.bashrc and ~/.bashrc ### Check for shell interactivity. if [[ $- != *i* ]] ; then return fi ### Nyan-cat prompt. PS1="\`if [ \$? = 0 ]; then echo \[\e[35m\]^_^\[\e[0m\]; else echo \[\e[31m\]O_O\[\e[0m\]; fi\` \$ " ### PATH export PATH=$PATH:$HOME/bin So when I run emacs from terminal all OK. When I start it with dmenu (getenv "PATH") and exec-path variable doesn't contain ~/bin directory. When I do it in xfce with xfrun4 command with same bash configuration all seams to work too. What is the problem with dmenu?

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• Installing PostGIS on Windows

  - by Cornflake

  I've installed PostgreSQL and PostGIS, and now I'm trying to follow these instructions: http://docs.djangoproject.com/en/dev/ref/contrib/gis/install/#spatialdb-template But I keep getting the following error, both in the command prompt and in Cygwin: C:\Users\Home>createdb -E UTF8 template_postgis createdb: could not connect to database postgres: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"? And I know PostgreSQL is running, because I'm using it right now! Installing open source applications can sometimes be so frustrating... I'll be very grateful for your help!

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• Trying to rename a computer via the netdom command and force a reboot

  - by user57020

  Why doesn't this work? it looks like it will but nothing happens. Option Explicit Dim wshNetwork Dim wshShell Dim PCname Dim Newname Set wshNetwork = WScript.CreateObject("WScript.Network") Set wshShell = WScript.CreateObject("WScript.Shell") PCname = InputBox("Type in the name of the pc you want to rename") Newname = InputBox("Type in the name of the new pc name") wshShell.run("netdom renamecomputer " &PCname& " /NewName:"&Newname& " /reboot:00 " ) 'MsgBox("netdom renamecomputer " &PCname& " /NewName:"&Newname& " /reboot:00 /y")

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• Linux bash: when to use egrep instead of grep?

  - by Michael Mao

  Hi all : I am preparing for a Linux terminal assessment now, I tried to Google and found most resources are referring to the basic "grep" rather than the more powerful "egrep" -- well, that is at least what the professor said in lecture. I am always working with small samples so performance tuning is a thing too far away. So basically I'd like to know are there any areas where I must switch to egrep to do it in a better way? Is it safe to work with basic "grep" as for now? will there be potential risks? Sorry about my limited knowledge on Linux shell commands, the man page looks like a maze to me and honestly I haven't put much time in understanding all the features both command provide.

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