gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/test/util/errno_safe_allocator.cc (about)

     1  // Copyright 2024 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // new and delete that preserves errno in case of success.
    16  
    17  #include <errno.h>
    18  #include <stdlib.h>
    19  
    20  namespace {
    21  void* errno_safe_malloc(size_t size) {
    22    int original_errno = errno;
    23    void* result = malloc(size);
    24    if (result != nullptr) {
    25      errno = original_errno;
    26    }
    27    return result;
    28  }
    29  
    30  void errno_safe_free(void* p) {
    31    int original_errno = errno;
    32    free(p);
    33    errno = original_errno;
    34  }
    35  }  // namespace
    36  
    37  void* operator new(size_t size) { return errno_safe_malloc(size); }
    38  void* operator new[](size_t size) { return errno_safe_malloc(size); }
    39  void operator delete(void* p) { errno_safe_free(p); }
    40  void operator delete[](void* p) { errno_safe_free(p); }