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This is necessary to ensure errno is not updated while allocating. Allocators are allowed to update errno, even in case of success. As gvisor uses matchers to check the value of errno, the tests might fail if errno is overriden by an allocation done while building the matcher. Using a custom implementation of new and delete ensures this is not the case. PiperOrigin-RevId: 619238390
41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
// Copyright 2024 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// new and delete that preserves errno in case of success.
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#include <errno.h>
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#include <stdlib.h>
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namespace {
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void* errno_safe_malloc(size_t size) {
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int original_errno = errno;
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void* result = malloc(size);
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if (result != nullptr) {
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errno = original_errno;
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}
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return result;
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}
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void errno_safe_free(void* p) {
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int original_errno = errno;
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free(p);
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errno = original_errno;
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}
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} // namespace
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void* operator new(size_t size) { return errno_safe_malloc(size); }
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void* operator new[](size_t size) { return errno_safe_malloc(size); }
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void operator delete(void* p) { errno_safe_free(p); }
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void operator delete[](void* p) { errno_safe_free(p); }
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