ggaaooppeenngg questions

• What's the relationship between GPIO and SPI?
• Why need to sleep(1) to allow socket to drain?
• How GPIO is mapped in memory?
• How can I silence the "Terminated" message when my command is killed by timeout?
• How to set memory limit to a process in Golang
• What's the difference among Expression,Statements and Declaration from the view of compiler?
• Is there any example and usage of url.QueryEscape ? for golang
• what is the function of /etc/apt/sources.list.d?

ggaaooppeenngg answers