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• Deleting a possibly locked file in c

  - by Moev4

  I am using fcntl locks in C on linux and have a dilemma of trying to delete a file that may possibly be locked from other processes that also check for the fcntl locking mechanism. What would be the preferred way of handling this file which must be deleted, (Should I simply delete the file w/o regard of other processes that may have reader locks or is there a better way)? Any help would be much appreciated.

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• POSIX: allocate 64KB on 64KB boundary.

  - by Eloff

  I would really like to actually only allocate 64KB of memory, not 128KB and then do the alignment manually - far too wasteful. VirtualAlloc on windows gives precisely this behavior. Supposedly there's code in SquirrelFish for doing this on just about every platform, but I haven't managed to locate it. Is there a space efficient way to allocate 64KB on a 64KB boundary in POSIX? Failing that, in Linux?

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• Good book for learning Bourne shell?

  - by John Isaacks

  I want to learn how to write shell scripts. Particularly I want to write a svn post-commit script to upload files from a test server to a production server. I am sure I will want to write more as I get more into it. I have very little linux/unix knowledge. Can anyone recommend a good book?

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• wx.NotificationMessage AttributeError: 'module' object has no attribute 'NotificationMessage'

  - by HughGrigg

  I get this error when trying to use wxPython's NotificationMessage class: wx.NotificationMessage("", "Hello world!").Show() AttributeError: 'module' object has no attribute 'NotificationMessage' The code is quite simply: #!/usr/bin/python import wx app = wx.App() wx.NotificationMessage("", "Hello world!").Show() app.MainLoop() What am I missing? This is running on Linux Mint 13, MATE 1.2 desktop environment, Python 2.7.3.

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• Getting the DLL name from a mingw32-compiled lib/a file

  - by epsy

  Hi, I am changing our build system in order to handle cross-compiling and packaging. It is a common thing to ship dependencies' DLLs but CMake's FindXXX modules(./configure checks) don't provide the path to these DLLs but only to .a files. I quickly looked inside the .a libs and they all seem to contain the DLL's name. What would be a proper way of extracting them from the .a file on a Linux build machine?

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• embedded web browser

  - by Ilya

  Hi, I'm looking for Linux embedded web browser, or preferably just a rendering object (it will not be used for actual browsing, just for displaying web based gui). The requirements are: Written in C (small footprint) Support Dynamic HTML Support Java script Minimum dependencies on the libraries (although i understand that it can not be completely standalone) No Dependency on X11 (i.e working with direct frame qui libraries) So far i only found Embedded Konqueror. Any suggestions are welcomed, commercial solutions are OK, but open source is preferable.

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• How 2 make a Nis Server

  - by Abhishek

  CAn any1 plz tell me how 2 make a NIS server... plz do tell me d files which r goin 2 b used alongwid their path... Nd im usin Linux nt Solaris any other machine....

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• Displaying an image from the tmp directory

  - by Roland

  I have the following. A website that create temporarily images in the /tmp folder on the Linux server. The reason why I store it within this folder is since these images need to be cleared once in a while and it's so much easier just to clear the tmp directory using tmpwatch. Now my issue is to display the image within my browser? Code <img src="/tmp/3d34636.png" alt="image" /> I'm running Centos with PHP

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• Amazon Machine Image(AMI) for PHP5

  - by user365941

  Hi, I would like to move my application on EC2. I would like to know the AMI Image which has Linux(Preferably Ubuntu),PHP 5,MemCached, eAccelerator or XCache. Please advise. Regards, Mugil.

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• Books for transport layer protocol implementation in Computer Networks

  - by bala1486

  Hello. I am trying to implement a transport layer protocol for my project. I am going to use Linux as my operating system. Could you please suggest me some books or links that explain the implementation of transport layer (like TCP)? Thank you.. Thanks, Bala

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• Use OpenBSD's malloc, realloc and free in my program

  - by bobby

  I would like to use OpenBSD's implementation of malloc, realloc and free on my Debian lenny desktop rather than glibc's. Are they simply drop in replacements: will they work on my Linux desktop ? Which are the file(s) that I need and which OpenBSD package contains them ?

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• how to check if the OS is Windows or Debian in c++?

  - by tsubasa

  I want to clear console screen every time the user make an input in C++. I'm thinking of using system command. For Windows, it is "cls". For Linux, it is "clear". Is there a way check which system to use the appropriate command in c++? Thanks.

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• Can I automate the finding of -l parameter I use when linking based on header files (gcc)?

  - by kavic

  Normally when linking against a static library, I have to specify a library directory and the name of a libX.so (or its symbolic link) as -lX flag for linking [and its directory with -L flag]. Can I automate this based on my header files (in c/c++) only? Or maybe it is not a good idea? Is there a software for locating the -L and -l parameters automatically? Is some table stored somewhere on the system about this on popular linux systems or even cygwin?

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• What size of folders show ls -la

  - by Bkmz

  Hi. I'm interesting in information what show me output ls -la in linux. So, default size is 4K. But if there are a lot of files, maybe with zero size, such as PHP sessions =), the size != 4K. What showing me ls -la? And after, when i clean this folder i see tha last max size.

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• Graphing the DAG generated by make?

  - by Robert S. Barnes

  My understanding is that when make executes, it generates a DAG internally to represent all the dependencies in the project. Is there a way to get at that DAG and graph it, say using something like graphviz? I'm using gnu make on Linux.

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• Which posix flavor of regex does perl use?

  - by Kyle

  Specifically, I'm using the linux command: find . -regextype posix-extended -regex '' ... I just want to make sure the posix type I'm using is the type Perl uses, since that is by far the one I am most familiar with.

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• Downloading all files from an FTP Server

  - by Navarr

  I need to download everything from an FTP server to hosting on a different server. I have shell access only to the server I'm downloading the files to. How, using the Linux FTP comnand, can I download every file, creating the directories needed for them in the process?

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• stderr to file; but without buffering

  - by l.thee.a

  I am trying to isolate a nasty bug, which brings down my linux kernel. I am printing messages to stderr and stderr is redirected to a log file. Is there a way to disable buffering on the file access? When kernel hangs, I am losing the messages in the buffer.

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• How do I build git on Red Hat EL 3?

  - by Steve Hanov

  When you try to build git on Red Hat Enterprise Linux 3, you get an error: In file included from /usr/include/openssl/ssl.h:179, from git-compat-util.h:139, from builtin.h:4, from fast-import.c:147: /usr/include/openssl/kssl.h:72:18: krb5.h: No such file or directory

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• length of captured packets more than MTU

  - by kumar

  Hi, I m running iperf between two machines (linux) and I can observe the mtu of both the interfaces connected is 1500. I ran tcpdump to capture packets and I observed some packets have "length as 2962"....how come this is possible with mtu as only 1500? Please clarify. Thanks! Note: flags field is set as DF. and proto is TCP

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• Rookie file permissions question

  - by Camran

  What is the ending 'r' for and the leading 'd' for in file permissions on Linux? Example: drwxr-xr-x I know about the user, group, others part, and I know w=write, r=read, x=execute. But I don't know about the leading 'd' and the trailing 'r'. Care to explain? Thanks

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• stat() doesn't find a file in c++

  - by user1432779

  on Linux 12.04 I have an executable file located in say: /a/b/exe and a config file on /a/b/config when doing: cd /a/b/ ./exe everything's ok and the stat function finds the file config on /a/b/ HOWEVER,when running from root /a/b/exe the stat doesn't find the config file any idea why? it makes it impossible to run the binary using a script that isn't ran from the folder of the exe.... Thanks

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• java on all platforms

  - by noname

  if you wanna code a desktop application in java for windows, mac and linux, will the code be the same for all of them? and you just change the GUI so that the Windows application will be more Windows-like and so on? how does it work without digging into details?

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• Equivalent of print "-"x20 of perl in Bash or command line

  - by khmarbaise

  In perl you can simply write print "-" x 20 and you get a line with dashes...but i need the same thing in bash/commandline on linux without perl/(g)awk etc. any ideas? The intention is to use it in the -exec of the find command and i want to prevent using simple echo "---------" ...

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• Copy the contents of one partition to another partition hardrive

  - by user326613

  if i write this command in linux "dd if=/dev/sda of=/dev/sdb" it copy the whole dev/sda partition bit by bit to dev/sdb.....is there any way that i can just only copy the contents of /dev/sda to /dev/sdb and not the whole partition bit by bit......

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