DMA buffers are memory mapped by the driver. For example, in pci-skeleton.c, which uses rtl8319 we have: But DMA engine can reside in soc or in device. **Is it that dma buffers should be allocated even if DMA engine is in device ? Why ? ** rtl8139cp datasheet (I think the dma is part of the device, but not su…
grep string after first occurrence of numbers
How do I get a string after the first occurrence of a number? For example, I have a file with multiple lines: I want to get the following output: Thank you. Answer Imagine the following two input files : A quick solution with awk would be : This line substitutes the first string of anything that does not cont…
OSError: [Errno 19] Failed to open the uinput device: No such device
I am pretty new to raspberry and Linux. I am trying to run basic example of python library uinput on Raspbian (r Pi 3 B) with following code: I get the error: Traceback (most recent call last): File “/home/pi/Desktop/t1.py”, line 7, in uinput.REL_Y, File “/home/pi/.local/lib/python3.5/site-p…
How to download a website where javascript code lookup results are included? [closed]
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 terminate terminal that is connected to a AWS box but still leave process on?
I have ssh’d into a ubuntu AWS box via terminal on mac. I have successfully setup the process I want to run in the box. How do can exit out of terminal without killing the process running? Thank you in advance. P.S New to linux and terminal on mac Answer Personally I use screen to get in/out of the syst…
pcap library not found error when trying to install reaver on linux fedora
I use a Linux Fedora 27 machine and I would like to install reaver-1.4. I have the same problem as described here: error pcap library not found but I tried both commands: sudo yum install sqlite-devel and sudo yum install sqlite3 libsqlite3-dev libpcap0.8-dev and nothing works. With the first command nothing …
How to kill a process after a given real running time in Bash?
For killing a process after a given timeout in Bash, there is a nice command called timeout. However, I’m running my program on a multi-user server, and I don’t want the performance of my program to be influenced by others. Is there a way to kill a process in Bash, after a given time that the prog…
Colorizing echo works in Solaris but doesn’t work in Linux
I have 2 different servers where I log in with same network user and run the same script. One is Solaris and another is Linux. Sample echo line from the script works differently on those servers: In Solaris -> it displays the text “auto update” correctly in green In Linux -> it displays the …
reboot raspberry if python script stop with error
I use a Python script on a raspberry that communicates with the Internet and USB with an Arduino and it happens that one of the 2 communications blow because of some error, and I would like in case this file python stops because of an error that the Raspberry restarts ! can some one hepl me ? Answer This is
Predefine a macro in kernel module
I would like to define a macro for my kernel module by using the -D flag, but I can’t figure out how to do it in a custom loadable kernel module. Just to be clear, to set the macro TEST to 1 I usually do something like: cc -D TEST=1 file.c -o file And inside the file.c I have Now,