| This library is used directly in libc. So it cannot use most high-level | |
| facilities. In particular, <zircon/assert.h> is not permitted because it | |
| uses printf. It's also important to restrict the (non-hidden) symbols | |
| used to only standard C symbols and the reserved namespace (external | |
| linkage symbols starting with `_`). The Zircon system call API can be | |
| used freely, but only via the `_zx_` names and not the `zx_` names. |