I have a simple program that listens to a socket. Everything goes fine except when the connection is lost in while(1) cycle. In this case the program falls into read from socket for many times without result. How can I detect a disconnected client in while(1) cycle? Answer Change: To: Also, your code mishandl…
Tag: linux
How to run Ionic serve permanently?
I am using Ionic framework for one application. The code is on a linux server. I am running the application using ionic serve command through putty. But, the problem is if I close the putty the application is stopped. Is there any way to run the ionic serve permanently as a daemon process? Answer I’m su…
how to rearrange all paragraphs from vertical to horizontal (all next to each other)
I have a file with about 25 paragraphs, they are separated by a blank line, each paragraph has about 2 to 20 lines, and each line has 5 columns separated by a semicolon.How can I move paragraph 2 next right to paragraph 1,paragraph 3 next right to paragraph 2 and so on. My goal is to paste everything later in…
Linux Mint: Bitnami Xampp access issue
I have installed Bitnami Xampp on linux mint, it is installed inside /opt/ The application is unable to access(Write/Read) files and hence not able to work on it. Any Solution Please…….. Thank You Answer After the previous setting –$ sudo chmod -R 777 opt Xampp is not working with following …
Are git commands supposed to be run under the working directory directly?
Suppose I have a git working directory, i.e. the directory which has a subdirectory called .git. I wonder if the current directory matters when I run a git command. Is it okay to run a git command directly under the working directory directly under some subdirectory of (subdirectory of) the working directory …
Why can only async-signal-safe functions be called from signal handlers safely?
I am still a little confused as to why exactly it is unsafe to receive a signal and call a non async safe function from within that signal handler. Could someone explain the reasoning behind this and possibly try and give me some references that I can follow to read up more on this myself? In other words I am
How to invoke scull_open() in user-space, where scull_open is defined in scull kernel driver
I am newbie to Linux device driver programming. I am just trying to use the scull driver which is explained in Linux Device Drivers. Would like to invoke the scull_open() from user-space for write/read or close operations. Currently I’m able to insert the scull module successfully using insmod and got t…
CGI script not executing bash commands such as ‘CP’
I have a web server (apache2) set up to execute files with a .cgi file extension. This works for some commands. However, I need it to copy the file /var/www/on.html to the location of /var/www/a1.html. I am using Debian Linux. The script is as follows: I am using cp to copy a html webpage with a green backgro…
Time spends in CPU faster than in reality
I am wondering why my entire application runs in less than 8 seconds while the time obtained from clock_gettime is 19.3468 seconds which is more than two times as much as what happens in reality. Where is the problem from? Update: I am not using any OpenMP explicitly. Answer CLOCK_MONOTONIC should be used if …
Docker compose build error
If I use command docker-compose build, I’ll get error that looks like: I use the last version docker and docker-compose. My docker-compose.yml has the next code: I use an ubuntu 14.04 Could you tell me how is fix it? Answer You need to put the port definitions in quotes for short ports (2 digits). This …