Function os_stack_low

codegraph-kernel/src/stack.rs:66–83

()

/// Low (deepest) address of the calling thread's stack, from the OS.
#[cfg(target_os = "linux")]
fn os_stack_low() -> Option<usize> {
    // SAFETY: plain pthread queries on the calling thread; `attr` is
    // initialised by pthread_getattr_np and destroyed before returning.
    unsafe {
        let mut attr: libc::pthread_attr_t = std::mem::zeroed();
        if libc::pthread_getattr_np(libc::pthread_self(), &mut attr) != 0 {
            return None;
        }
        let mut addr: *mut libc::c_void = std::ptr::null_mut();
        let mut size: libc::size_t = 0;
        let rc = libc::pthread_attr_getstack(&attr, &mut addr, &mut size);
        libc::pthread_attr_destroy(&mut attr);
        if rc != 0 || addr.is_null() || size == 0 {
            return None;
        }
        Some(addr as usize)
    }
}

#[cfg(target_os = "macos")]
fn os_stack_low() -> Option<usize> {