; edi - fd
; si - events
pollfds__append:
    ; TODO check against pollfds_capacity
    mov r10, [pollfds_len]
    mov [pollfds + r10 * pollfd_size], edi
    mov [pollfds + r10 * pollfd_size + 4], si
    mov r11w, 0
    mov [pollfds + r10 * pollfd_size + 6], r11w
    add r10, 1
    mov [pollfds_len], r10
    ret

; rdi - pollfds array index to remove
pollfds__remove:
    mov r11, [pollfds_len]
    cmp rdi, r11
    jge return  ; XXX index out of bounds, do some other error?
    cmp r11, 1
    jle pollfds__clear
    mov r10, [pollfds + (r11 - 1) * pollfd_size]
    mov [pollfds + rdi * pollfd_size], r10
    sub r11, 1
    mov [pollfds_len], r11
    ret

pollfds__clear:
    mov r10, 0
    mov [pollfds_len], r10
    ret