Tag: linux

pthread_cancel and cancellation point

I’m learning the pthread_cancel function and testing whether thread would be cancelled when it doesn’t reach cancellation point. Thread is created by default attribute and make it running in add loop. But when cancellation request was sent and thread exit immediately. It doesn’t reach cancel…

sh/awk (partly) script returning a null value but want it to return a value

awk linux sh

I have the following sh script: the values that it is outputting looks like the following: As you can see it is returning a null value against the following line: This should look like the lines above and below. ([time] – [time] – [duration] etc) Which is in turn effecting the time calculation ( n…

Phusion Passenger – ActiveRecord::PendingMigrationError

activerecord linux mysql ruby ruby-on-rails

I am trying to run simple RoR application with Phusion Passenger. At the moment when go to localhost I see the error from subject. In fact I don’t have any pending migration: My platform is Linux (Debian 8 Jessie 64x). My database is MySQL (gem ‘mysql2’, ‘~> 0.3.18’). I am usi…

How to disable serial console(non-kernel) in u-boot

embedded-linux intel-edison linux u-boot yocto

I am building a Yocto image for Intel Edison. One of the image’s components is u-boot with an Edison-specific patch. By default, Edison’s UART port is used for u-boot console. I want to disable this feature, but only on the serial interface(u-boot also listens on USB and that needs to stay). My ma…

linux Makefile syntax for blank lines in screen output

linux makefile screen

i have this makefile: It results the below output: what i am looking to do is create a space between “prompt> make” and the first happening of gfortran. and ideally i would like the output on the screen to first print out the contents of my COMPILER_VERSION variable before the first gfortran ha…

RaspBerry Pi Command Line/Application – List IP Devices

ip java linux networking raspberry-pi2

I’m trying to make a very simple Raspberry Pi application that would auto-update with all the IP addresses, Mac addresses, and their respective device names that are all on the same network. I have absolutely no idea where to start, any recommendations on how to get this done? I play to connect a LCD an…

How to detect that a child process has crashed?

c++ linux

A child process can: Exit normally (by exiting using exit(0),exit(22), exit(23)) — This is obviously specific to my application Exit abnormally (code throws an exception, receives an unhandled signal, core dumps, etc…) I am doing a fork/exec from a parent process and looping on waitpid, when I det…

Strange mouse bug on linux [closed]

archlinux linux mouse

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack …

How to call user/group IDs in Linux bash scripts

bash linux

I have this bash script. I run it with the following command: sudo ./install.sh Calling the user core as 500 and root as 0 not working. I’ve got the following error: The reason why I want to use user or group numbers, because I want to make it multiplatform (would be nice if it can choose between 500 or…