What system calls does one use for sending data over the internet?

Question

Seeing as network interfaces don't have a location within /dev , I'm curious as to how one would program utilities that make web requests (or configure stuff), ie

ip link set *interface* up
iw dev *interface* scan

Specifically, what system calls would one even use?

Answer 1

Try this,

strace -e trace=network ip link 2>log2.txt

then read log2.txt to see what system calls were made by ip link . From there you can search the web or man pages for more specific details.