Why does calling setuid() return "Bad system call"?

So actually, I have Android 13. The problem is in my C code (probably?). When I call setuid(0) or setuid(getuid()) in my phone, I get this output:

Bad system call

Meanwhile on my laptop with Ubuntu, setuid() doesn't throw any error, and returns -1 (so that's how it should be). Then why does Android's setuid() throw that? And if Bad system call is normal for Android, then how can the Android system call setuid() for each Java application (uid 10000 and greater)?