Hi Cygwin, May I ask if there will be an implementation of msgget() on Cygwin for Windows? $ gcc -o sender sender.c $ ./sender key is 62720123 qid is -1 couldn't get queue id: Function not implemented I googled the above error and it seems like this issue was raised in 2017. It was meant to be fixed but I seem to have the same problem. May I ask what I should do? I've attached the files that I used. Thank you. Kind Regards, YEO Kai Wei