Recent questions tagged linux

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linux kernel - how does open works for normal file and device drivers

Currently, I am learning Linux device drivers. And got stuck over how opening a device file works ? What I ... cdev_init(&c_dev, &pugs_fops); ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - How to reset emacs to save files in utf-8-unix character encoding?

I have a problem. I found out that emacs recently stopped to save all my new files with the default character ... the proper coding system??? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux raw ethernet socket bind to specific protocol

I'm writing code to send raw Ethernet frames between two Linux boxes. To test this I just want to get a simple ... solution. How do I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Tracking threads memory and CPU consumption

I'm writing a Linux application which observes other applications and tracks consumption of resources . I'm planning ... , OpenMP, any other. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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759 views

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linux - Create a thumbnail preview of documents (PDF, DOC, XLS, etc.) in PHP (LAMP)

When users upload certain files to my site (such as .doc, .xls, .pdf, etc) I'd like to be able to ... do the job (Linux highly preferred). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - How to return memory from process to the OS

I have an issue with memory management in various operating systems. My program is a server that does some processing ... why not all of it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - fork() failing with Out of memory error

The parent process fails with errno=12(Out of memory) when it tries to fork a child. The parent process runs on Linux ... with g++ 4.6.3. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Any porting available of backtrace for uclibc?

We are running the uclibc linux on ARM 9. The problem is uclibc doesn't support backtrace. When a core dump ... dump happens (uclibc+ARM+Linux)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Elasticsearch process memory locking failed

I have set boostrap.memory_lock=true Updated /etc/security/limits.conf added memlock unlimited for elastic search user ... locks (-x) unlimited See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Accessing Bluetooth dongle from inside Docker?

Is it possible to use a bluetooth (BLE in my case) dongle inside of a docker container? On my host ... to use bluetooth inside of Docker? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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749 views

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linux - Is there any shortcut to reference the path of the first argument in a MV command?

I often find myself using mv to rename a file. E.g. mv app/models/keywords_builder.rb app/models/ ... efficient way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Accessing a cygwin symlink from windows

I am quite new to cygwin. I created a symlink as follows $ ln -s /var/www /cygdrive/d/foo and when I ... for Windows instead of a system file? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Pycharm Startup Error: Unable to detect graphics environment

I'm trying to setup Pycharm professional edition on Fedora 25 x64. After downloading the files and extracting ... . Any suggestions please ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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703 views

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linux - pySerial works fine in Python interpreter, but not standalone

Good morning! Recently I bought an Arduino board to make sort of "light control" in my room. Here is the code ... ; Serial.println(control); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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731 views

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linux - Scripts launched from udev do not have DISPLAY access anymore?

I have a script that runs from udev when I plug in my external drive. It always worked. But after upgrading ... have this done auto'magic'ally? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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794 views

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linux - docker COPY with file globbing

Inside the dockerfile, I want to specify a copy operation for files which are defined by globbing and I want it to ... ENTRYPOINT ["dnx", "web"] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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819 views

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linux - How to get the exit status a loop in bash

I know how to check the status of the previously executed command using $?, and we can make that status using ... I want to check the status. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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885 views

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linux - RPM - Install time parameters

I have packaged my application into an RPM package, say, myapp.rpm. While installing this application, I would ... for the same application. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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673 views

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linux - Eclipse won't launch because `reload maven project has encountered a p?r?o?b?l?e?m`

When I try to start Eclipse Luna in CentOS 7, I get the following dialog box: How can I resolve this and get eclipse to start? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Syntax error: end of file unexpected (expecting "then")

I am making this code for a minecraft server plugin updater I am a new shell scripter so I don't know alot... ... notepad++ how can I fix this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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724 views

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linux - PhantomJS: pipe input

I am trying to use PhantomJS to render an html page to pdf. I do not want to write the files to disk, I ... is blank. Am I missing something? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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842 views

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linux - How to replace to apostrophe ' inside a file using SED

I have a file "test.txt" that contain the following +foo+ +bar+ What I want to do is to replace them into: ' ... What's the right way to do it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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759 views

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linux - Can 'connect' call on socket return successfully without server calling 'accept'?

Server has created a socket and bound to a port and started a thread which is in loop to accept the connection ... Am I missing something here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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808 views

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linux - what does a python process return code -9 mean?

I have a python script which returns the exit status of -9. I tried to get the root of the problem with the ... , operating system: linux 3.7.10 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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917 views

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linux - How do I properly write to FIFOs in Python?

Something very strange is happening when I open FIFOs (named pipes) in Python for writing. Consider what happens when I ... with Linux 2.6.38. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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800 views

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linux - Running docker on Ubuntu: mounted host volume is not writable from container

Docker works great on a Mac for me, but I have to run docker host inside of a VirtualBox (or Parallels, or ... 10, 64 bit edition, not CentOS. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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843 views

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linux - C++ shared library undefined reference to `FooClass::SayHello()'

I'm making a C++ Shared Library and when I compile a main exe that uses the library the compiler gives me: ... is an Ubuntu Linux 12 Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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990 views

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linux - Get rid of "gcc - /usr/bin/ld: warning lib not found"

I have the following warning during link: /usr/bin/ld: warning: libxxx.so.6, needed by /a/b/c/libyyy.so, ... times and it's very annoying)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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