How is the system call in Linux implemented?

Question

When I invoke a system call in user mode,how did the call get processed in OS?

Does it invoke some some executable binary or some standard library?

If yes,wh

Answer 1

It goes through glibc, which issues a 0x80 interrupt after filling registers with parameters. The kernel's interrupt handler then looks up the syscall in the syscall table and invokes the relevant sys_*() function.