What is the purpose of the sendto and epoll_wait system calls in Android?

Question

Android

Good afternoon. I would very much like to know what the sentto and epoll_wait system calls are responsible for and what functions they perform in the android OS (not in Linux!). Tell me please.

Answer 1

at the bottom of the android, all of a sudden, the Linux kernel. why should system calls be different?
bionic . on my own :)

Answer 2

So sendto() is used to send datagrams? epoll_wait - wait for an I/O event on an epoll file descriptor? Can it be clearer what they do?
I noticed such a feature. I ran malicious programs in the emulator and looked at what processes they were using with the stace -c command. Up to 91% of the time, the sendto process was used.
can this be?