//! Process control.

use crate::sys;

unsafe extern "C" {
    // libc exit(): runs atexit handlers (and .fini_array), then SYS_EXIT.
    #[link_name = "exit"]
    fn libc_exit(code: i32) -> !;
}

/// Exit the process. From a sibling thread this ends only that thread
/// (kernel semantics); use [`abort`] to take the whole process down.
pub fn exit(code: i32) -> ! {
    unsafe { libc_exit(code) }
}

pub fn id() -> u32 {
    unsafe { sys::syscall0(sys::SYS_GETPID) as u32 }
}

/// Terminate the whole process from any thread. Waiters see exit code
/// TerminatedAborted (256 + SIGABRT).
pub fn abort() -> ! {
    unsafe {
        sys::syscall0(sys::SYS_ABORT);
        // Not reached. No panic here: the panic handler calls abort().
        loop {
            sys::syscall0(sys::SYS_YIELD);
        }
    }
}