When I converted the my text on this site, be converted correctly: http://string-functions.com/encodedecode.aspx I choose source ‘Windows-1252’ and target ‘utf-8’. See it in the screenshot below: https://i.stack.imgur.com/2Pn4E.png But when I convert with the following code, Some lette…
ESP8266 module fails at boot
I have a ESP8266MOD ESP-12-E hooked up to a USB-to-UART module. When I try to communicate with the module I get some intelligible output then an error message and the communication is closed. For ai-thinker-0.9.5.2-115200 and espressif-nonos-2.0.0-SDK (this is not the actual name of the file): For a nodeMCU f…
Unable to unzip large Linux zipped archive in Windows
Server environment: Linux RHEL5 x86_64, Apache, PHP Client environment: Windows 10 64 bit (VirtualBox MacOS host), 4GB Ram, 30GB free space, Browser IE11 (also tested with Edge/Firefox), 7zip The scenario is the following: I upload a zip (there is a file inside the archive that is 2.5GB) via browser to my PHP…
Scrapy KeyError in Linux Server but not on Windows
My Scrapy works just fine on my local machine, Windows. Then I try to run it on my AWS Linux server, but I got this Why is that? How can I run it on my Linux Server? Answer Suddenly solved and I confused myself. I solve it by updating all the requirements using pip install -r requirements.txt. I added Scrapy
How to store command output into array in Ansible?
Essentially, I want to be able to handle “wildcard filenames” in Linux using ansible. In essence, this means using the ls command with part of a filename followed by an “*” so that it will list ONLY certain files. However, I cannot store the output properly in a variable as there will …
can /proc/self/exe be mmap’ed?
Can a process read /proc/self/exe using mmap? This program fails to mmap the file: Answer You are making 2 mistakes here: Mapped size must be > 0. Zero-size mappings are invalid. You have to specify, if you want to create a shared (MAP_SHARED) or a private (MAP_PRIVATE) mapping. The following should work f…
Mitigating memory leaks by forking
This is a really ugly question. I have a C++ program which does the following in a loop: Waits for a JMS message Calculates some data Sends a JMS message in response My program (let’s call it “Bob”) has a rather severe memory leak. The memory leak is located in a shared library that someone …
Signals in ppoll not handled immediately
I wrote a small ppoll test but I am confused about the signal handling. The man page says: The relationship between poll() and ppoll() is analogous to the relationship between select(2) and pselect(2): like pselect(2), ppoll() allows an application to safely wait until either a file descriptor becomes ready o…
How does perf associate events to functions?
More precisely how does the perf tool associate PMU events to functions i already realized that when the kernel perf subsystem records the event counters it also records the Program Counter (PC) so it can associate the count to a function. However to really get fine grain result, you need to sample the counte…
linux files and folders are not inheriting parent directory permissions
I created a directory /share and gave chmod 2770 permission and chown root:stock /share. 1) When I create touch a file inside /share, I see the file has rw-rw-r– and I don’t see rwxrws— 2) When I create a directory in /share/data I see the permission as drwxrwsr-x where are the parent direct…