Problem: I have timer(s) running, upon expiration of timer(s) certain function needs to be invoked. Output: There is a segfault inside Hndlr() function As per man page of sigevent, it says, SIGEV_THREAD – Notify the process by invoking sigev_notify_function “as if” it were the start function…
Editing root-owned files after “unshare -Ur”
Say I am in the initial user namespace and there is an empty root-owned file in some directory: Now I am switching to a new user namespace with unshare -Ur. In this namespace, root.txt is reported to be owned by “nobody” because original root uid(0) is not mapped to the new namespace: Then I use v…
How to add number assigned as array
I have that script that is supposed to read data from two txt files and add them. For that matter I have used array. I can read the data but there is a problem with the addition. Instead of ${dataAll[$i]}= $( ${data1[$i]}+${data2[$i]} ), I have also used ‘expr ${data1[$i]}+${data2[$i]}’ The analys…
How do i fix ksoftirqd 100% cpu
I am doing nothing and ksofttirqd uses 100% of my cpu and my pc is very slow. I looked in my /proc/interrupts and there are a lot of “local time interrupts”, “thermal event interrupts”. How do i fix it? (I run ubuntu 18.4) sensors Answer As you can see from the sensors output, your CPU…
Why print empty path in shell script?
samuel@:~/…/linux$ ./test.sh find . -type f -name “*” samuel@:~/…/linux$ How do I fix this to get find . -type f -name “*” ‘s result? Answer I suggest to use an array:
How can I ask GCC to use a different standard library?
I have a debug version of libstdc++ 6 in /usr/lib/debug/usr/lib/x86_64-linux-gnu/. I would like to tell gcc/g++ to use this library instead of the standard library version without debug symbols. I tried using -nostdlib and passing the library path explicitly with -L, but get linking errors such as It seems th…
Share Memory in Linux using C
Is it safe to use shm_unlink even there are other process currently open the shared memory? For exmaple: Process B shm_open and then Process A shm_unlink. Is it ok for Process B? Answer Yes, it is safe to call shm_unlink if another process has it opened. Per the man page for shm_unlink: The operation of shm_u…
FTP using Apache commons not working – Error: 550 Dataset not found (FTPid that i am using is getting appended to filename)
I am trying to ftp the file from Linux VM to an AS400 server. I was able to login to server in passive mode but when trying to use the STOR command to upload the file getting below error: Not sure why the ftpid that i am using is getting prefixed to the filename. Is there any way to avoid
How do I correct this printing out copied files from directory in Unix Bourne Shell?
So i need to write a Unix Bourne Shell to to copy all the files from the directories named dir1 and dir2 into a new directory named dir3. The script first copies all the files from dir1 into dir3. The script then copies every file from dir2 to dir3 subject to these conditions: if the file from dir2 is not
Linux CentOS 8 – Pip3 install Mariadb
Currently i’m working on a school project where I have to use MariaDB in a Python3 assignment. I have to build a Python script that connects to a database and put information into it. So said and done, I have created a Python script: But now my real issue is starting. I’m working with a Linux Cent…