| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| use crate::trts; |
| use core::alloc::AllocError; |
| use core::mem; |
| use core::ptr; |
| use core::sync::atomic::{AtomicPtr, Ordering}; |
| |
| static SGX_OOM_HANDLER: AtomicPtr<()> = AtomicPtr::new(ptr::null_mut()); |
| |
| #[allow(clippy::needless_pass_by_value)] |
| fn default_oom_handler(_err: AllocError) -> ! { |
| trts::rsgx_abort() |
| } |
| |
| pub fn rsgx_oom(err: AllocError) -> ! { |
| let hook = SGX_OOM_HANDLER.load(Ordering::SeqCst); |
| let handler: fn(AllocError) -> ! = if hook.is_null() { |
| default_oom_handler |
| } else { |
| unsafe { mem::transmute(hook) } |
| }; |
| handler(err) |
| } |
| |
| /// Set a custom handler for out-of-memory conditions |
| /// |
| /// To avoid recursive OOM failures, it is critical that the OOM handler does |
| /// not allocate any memory itself. |
| pub fn set_oom_handler(handler: fn(AllocError) -> !) { |
| SGX_OOM_HANDLER.store(handler as *mut (), Ordering::SeqCst); |
| } |
| |
| /// Unregisters the current custom handler, returning it. |
| /// |
| pub fn take_oom_handler() -> fn(AllocError) -> ! { |
| let hook = SGX_OOM_HANDLER.swap(ptr::null_mut(), Ordering::SeqCst); |
| if hook.is_null() { |
| default_oom_handler |
| } else { |
| unsafe { mem::transmute(hook) } |
| } |
| } |