Difference between UNIX domain STREAM and DATAGRAM sockets?
This question is NOT for the difference between STREAM type and DATAGRAM type INTERNET sockets. I know that STREAM sockets use TCP, Datagram sockets use UDP and all the TCP,UDP stuff, packets arriving in order, ACK, NACK etc. I understand the importance of these over internet. Q1) When I create a UNIX domain socket which is a local socket, how would it matter if the socket is STREAM socket or DATA
How to cherry-pick multiple commits
I have two branches. Commit a is the head of one, while the other has b, c, d, e and f on top of a. I want to move c, d, e and f to first branch without commit b. Using cherry pick it is easy: checkout first branch cherry-pick one by one c to f and rebase second branch onto first. But is there any way to cherry-pick all c-f in one command? Here is a visual description of the scenario (thanks JJD):
What is the intention of using React's useCallback hook in place of useEffect?
useEffect has very specific timing aspects related to it that you can read about here. The function specified will be executed after rendering is complete and the DOM has been updated. This will happen after each rendering where any of the values specified in the second-argument array change. useCallback doesn't automatically execute anything. It returns a function that can be executed by whatever
gdb in docker container returns "ptrace: Operation not permitted."
I've checked /proc/sys/kernel/yama/ptrace_scope in the container and on the host - both report the value as zero but when attached to pid one gdb reports Reading symbols from /opt/my-web-proxy/bin/my-web-proxy...done. Attaching to program: /opt/my-web-proxy/bin/my-web-proxy, process 1 ptrace: Operation not permitted. I've also tried attached to the container with the privileged flag docker exec --
ruby on rails - Can't heroku run rake db migrate through my app - Stack Overflow
it is my first time to encounter such error(s): Running `rake db:migrate` attached to terminal... up, run.8524 ! Heroku client internal error. ! Search for help at: https://help.heroku.com ! Or report a bug at: https://github.com/heroku/heroku/issues/new Error: Operation timed out - connect(2) (Errno::ETIMEDOUT) Backtrace: /usr/local/heroku/lib/heroku/client/rendezvous.rb:39:in `initialize' /usr/l
sql - ActiveRecord Arel OR condition - Stack Overflow
How can you combine 2 different conditions using logical OR instead of AND? NOTE: 2 conditions are generated as rails scopes and can't be easily changed into something like where("x or y") directly. Simple example: admins = User.where(:kind => :admin) authors = User.where(:kind => :author) It's easy to apply AND condition (which for this particular case is meaningless): (admins.merge authors).to_s
How to stop Server-Sent Events
Hello I have a javascript code that listens to a PHP code via Server-Sent Events, it is working well the response is sent from the server trough a loop and when the loop ends the Server-Sent Events stops however a few seconds after the script is again listening. how can I end the Server-Sent Events when the loop from the server side ends too? Thanks. JS : var sse=new EventSource("data.php"); sse.o
EventSource / Server-Sent Events through Nginx
On server-side using Sinatra with a stream block. get '/stream', :provides => 'text/event-stream' do stream :keep_open do |out| connections << out out.callback { connections.delete(out) } end end On client side: var es = new EventSource('/stream'); es.onmessage = function(e) { $('#chat').append(e.data + "\n") }; When i using app directly, via http://localhost:9292/, everything works perfect. The c
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