I was wondering if there is any way to notify a server if a client side application was closed. Normally, if I Ctrl+C my client side terminal an EOF-signal is sent to the server side. The server side async_read function has a handle which has boost::system::error_code ec argument fed into it. The handle is ca…
Tag: c++
how to return a phys_addr_t type value to user space
I need my driver to return phys_addr_t type value through an ioctl call. I need to return this value through a struct which is passed through arg. The question is what type do I use in this struct? For example, say the following struct is passed through an arg virt_to_phys returns a phys_addr_t, however this …
meaning of p in %pa[p] in the printk formats
The question is with regard to the printk formats. The documentation that I’m reading is located here Here is an excerpt that I’m asking about: What does [p] in %pa[p] stand for? What does it mean? Answer The p in [p] stands for phys_addr_t when used in %pap. This is analogous to the d in %pad sta…
Compile libxml2 get “error: storage size of ‘hints’ isn’t known”
I download libxml2 2.9.4 in here, when i ./configure; make, i get following error: the full output is here here is my environment: I try version 2.9.2 and 2.9.3, i get same error, how to compile libxml2 success? Answer I find the solution: in nanohttp.c, the error line: so i can disable ipv6 to don’t co…
Is there a way to automatically link all libraries an OpenGL program needs, without explicitly writing their flags on compile?
For an entry level program, I’m currently compiling with g++ manip.c -o manip -lglfw3 -lX11 -lXxf86vm -lXrandr -lpthread -ldl -lXinerama -lXcursor -lGLEW It was a very time-consuming process of trial and error figuring out which flags were necessary, googling the ‘undefined references to’, c…
Error: ‘GL/glfw3.h: No such file or directory’ when compiling C++ programs using OpenGL on Linux
I receive the error message when I try to compile the example program given in the tutorial here, section ‘Opening a window’. I have installed all the libraries they referred to in the ‘Building on Linux’ section. (My distribution is Ubuntu 16.04.) I have also successfully run as I fou…
Running bash using posix instead of fork/execv
I have a CLI, one of the commands is entering into Linux bash shell. This is the code which does it using fork & execv: I want to replace the fork/execv and to use posix_spawn instead: But it doesn’t work. Any help? Answer Let’s look at what the code in the original fork/exec does: close all f…
Linux: Reading file while other program might modify it
A program Foo periodically updates a file and calls my C program Bar to process the file. The issue is that the Foo might update the file, call Bar to process it, and while Bar reads the file, Foo might update the file again. Is it possible for Bar to read the file in inconsistent state, e.g. read first half
Cannot get mixed C and Ada program to link with pthread library
I am writing a program in C. I am getting the error: This specific error comes up when gcc is linking my file_name.o with my main ADA file. For the actual compilation of the C file, I have tried using both: as well as: Neither of these seem to work. Any thoughts? UPDATE: One thing I did not realize is
Socket Server Memory usage goes up, becomes unresponsive
I have the following socket server code for Linux using Pthreads. If I start stress testing this with: The memory increases to about 270MB then the server becomes unresponsive: On ARMv7 architecture this takes a shorter time. If I stop the requests with the for loop, the memory does not get freed up, meaning …