I have a short snippet of code, with some inline assembly that prints argv[0] properly in O0, but does not print anything in O2 (when using Clang. GCC, on the other hand, prints the string stored in envp[0] when printing argv[0]). This problem is also restricted to only argv (the other two function parameters…
Is it safe to remove SQLAlchemy-generated extensionless file from my PyCharm project?
I am making a Flask web app in PyCharm on Linux virtual machine. I recently noticed a strange file named ”$’a0406′ directly in the project’s directory. Any clues what it might be and if it’s safe to remove? Here’s the output of pip freeze in case you need it: Edit: I moved …
How can I stop the while?
I have A TCP Server-Client where I enter a number with the number of times that I want to send the word to the server. So I send correctly because I print the information on a loop(in client) but in the server shows infinitely because I put while(1) but if I don’t use just print it one time. I don’…
How to insert char in mathed lines in a file
For example, I have a file with the content: I want to add “_1” in all the lines with “a : “, and get the result as: Are there any ways by bash commands Answer Your spacing is unclear, whether you have “a : …” or “a: …”. You also have what appears si…
Segmentation fault error as the reader tries to read from the shared memory
I am trying to understand the System V shared memory APIs. I created a small program where one writes into the shared memory and another reads from the shared memory. But for some reason, I am getting an error : as I try to read from the shared memory. I could not find the reason for it. Here is what
Shell script: Using own IP adresss as variable
I have to write a shell script which initializes docker swarm. I need to pass the own IP address as argument: How can I do this dynamically? I know the ifconfig command, which allows me to see the IP, but I can not pass the whole thing as variable. It should look like this Answer The following command will re…
What is “(void*)-1” in the context of sbrk’s return value?
The Linux Man Page for sbrk() states that upon failure, it returns (void*) -1. What is (void*) -1 and does it have any significance or is it simply a number that could never actually be a void* which is cast to a void* just to meet the function signature of returning a void*? I ask this because I’ve nev…
How to get supported display refresh rates on Linux?
drmModeModeInfo structure from DRM contains uint32_t vrefresh; field, and the values are actually good there i.e. I’m getting 24-75Hz for different video modes. But refresh rates aren’t integers, they’re rational numbers, right now for my display the value is 59997/1000. Is it possible to get the precise numb…
Assimp aiString empty when compiling for Linux
I’m working on a simple OpenGL project and I’m new to C++. I’ve been slowly adding features to a very simple primitive 3D “engine” and I’ve worked to make sure it compiles cross-platform. I have a make file that I run for OSX and Linux (Ubuntu) and for Windows I have a Visu…
Why does the Linux Kernel copy implementation use the AC flag?
The implementation of copy_user_enhanced_fast_string in the Linux Kernel copy routine uses stac/clac in the epilog and prolog. perf annotate shows the following code: AC is “Alignment check (or access control) flag”. What is the reason stac/clac are used in the routine? What would be the consequen…