Can anyone please help me to point out as what is the error in my program? Thanks in advance, kingsmasher1 Output: msgsnd failed: Invalid argument Answer You do not have enough space in your buf.mtext (15 characters) for “This is a test message” (23 characters plust one more for a NUL terminator). I’d say there’s a good chance that may
Tag: c++
what are advantages and limitations of using mono project to run c# code on linux?
If anybody having the solution of advantages and limitations of using mono project to run C# Code on Linux, Please tell me your thoughts… Answer There’s a huge advantage – it works. You can use C#, develop, and run on Linux (and other platforms, including Windows). The disadvantage is that things don’t always work the same way as they do
Paint Pixels to Screen via Linux FrameBuffer
I was recently struck by a curious idea to take input from /dev/urandom, convert relevant characters to random integers, and use those integers as the rgb/x-y values for pixels to paint onto the screen. I’ve done some research (here on StackOverflow and elsewhere) and many suggest that you can simply write to /dev/fb0 directly as it is the file representation
Sharing memory between processes through the use of mmap()
I’m in Linux 2.6. I have an environment where 2 processes simulate (using shared memory) the exchange of data through a simple implementation of the message passing mode. I have a client process (forked from the parent, which is the server) which writes a struct(message) to a memory mapped region created (after the fork) with: message *m = mmap(NULL, sizeof(message),
What are the GCC default include directories?
When I compile a very simple source file with gcc I don’t have to specify the path to standard include files such as stdio or stdlib. How does GCC know how to find these files? Does it have the /usr/include path hardwired inside, or it will get the paths from other OS components? Answer In order to figure out the
using C code to get same info as ifconfig
Is there a way in Linux, using C code, to get the same information that “ifconfig eth0” would return? I’m interested in things like IP address, link status, and MAC address. Here’s sample output from ifconfig: Answer Yes, ifconfig itself is written in C. 🙂 See: http://cvsweb.netbsd.org/bsdweb.cgi/src/sbin/ifconfig/ifconfig.c?rev=1.169&content-type=text/x-cvsweb-markup Do man netdevice to see the details (on Linux). You use the ioctl()
Why are designated initializers not implemented in g++
Is there any specific reason why has support for designated initializers not been added to g++? Is the reason that C99 standards came late and g++ was developed earlier and later people didn’t care about this issue, or there is some inherent difficulty in implementing designated initializers in the grammar of C++? Answer As I noted in a comment, G++
Resetting an ostream, C++
I have 2 different ostreams, one of them cerr, using the same streambuffer, I have some libraries in that might have modified cerr somehow,(flags? format modifiers?). prints: Debugging mystreambuffer I’ve noticed that cerr calls mystreambuffer->sync() every << operation while teststream does not call it at all. If I am correct cerr is just an standard ostream, then, why do I
Socket data length questions
I have a couple of questions related to the following code: The questions: Why I read 255 not 256 ? Let’s say I want to send the word: “Cool” from the client to the server. How many bytes should I write “in client” and how many bytes should i read “in the server”? I’m really confused. Answer You already have
I cannot get stdout to update in Qt
I need to call an executable, from my QT application, monitor the output and then display the out put in a text browser. The executable I call from my QT app will run for many hours (~12) and each time the executable spits something out to stdout, I need to parse the output to be able to monitor its progress,