I’m writing my first linux kernel module. It is a standard char device to communicate over a GPIO pin. It works like a charme. It is registered with its device name under /dev and in my own class name under /sys (it has some attributes available for configuration by the host application). My wish is to …
Can I be sure that a UDP recv executed immediately after a successfull call to recv with MSG_PEEK will not block?
Assume the following code (for the sake of simplicity I’ve omitted the necessary error handling here): In that case: Can I be sure that after the first call to recv the whole datagram is already received and therefore the second call to to recv will not block? Or can it happen that if IP splits the datagram, …
The directory is being deleted too early
I’m trying to create a tar file from a directory’s contents using Codec.Archive.Tar, but I also want to clean up the directory once the tar file has been created. Here’s a small example which demonstrates my issue: When I call the function listFile e.g. from within ghci, I get back which I&#…
implement a read operation list in debugfs
i’m implementing a kernel module. using several techniques. 1 of them is to give read/write to different module variables. i was able to read/write all variables except the list i have in my module. the linked list: i would like to have a corresponding file in debugfs that will print the full list. i tr…
Domain argument to socket() and socketpair()
I’ve been studying Linux socket programming recently, and the concepts are still swirling and unsettled in my head. Can someone confirm or correct my understanding of the domain argument to socket() and socketpair(): one should choose PF_LOCAL (or PF_UNIX) if one wants the socket communication to be str…
Why I have to “source vitrualenvwrapper.sh” every time I open a new Terminal?
I use Zsh as my shell and I want to use vitrualenvwrapper. But when I close a terminal then open a new one, I have to “source virtualenvwrapper.sh” again then I can use virtualenvwrapper. Answer You need to put your script source-ing in some shell session initialization file e.g. /etc/zsh/zshrc (g…
Linux time conversion fail
My program will take the current system time in HH:MM:SS and convert it into seconds. The reason i convert it into second is because i want to find out the time that was 90 seconds ago. For example :Current time : 12:30:30Time 90 sec ago : 12:29:00 But i can’t make it to the correct timestamp. Here are …
How to filter properly my access logs with GoAccess?
I want to generate a report with only the POST /xmlrpc.php requests, so I run the following command : The results of the report are not all displayed (in the graph I see only 9 days, but I checked on the others logs and I have POST /xmlrpc.php requests almost every days (30 in total) ). Am I using zat
How to auto answer linux terminal
My code is But after question is “do you want install [y/n]”. How can I automaticaly answer to question? I want Whenever the terminal asks a question, my answer is be “y”. Answer Just add following to your command: It makes sure that confirmation is avoided.
MonoDevelop Error: Unknown MSBuild failure. Please try building the project again
Just installed MonoDevelop and I tried to compile a simple “Hello World”. Code I used: The error that I get is : My system info: Ubuntu 16.04 LTS , updated The MonoDevelop and mono are freshly installed. Mono JIT compiler version 5.0.1.1 MonoDevelop Version 5.10 I can use mcs and run it but can…