github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/util/save_util_linux.cc (about)

     1  // Copyright 2019 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  #ifdef __linux__
    16  
    17  #include <errno.h>
    18  #include <sys/syscall.h>
    19  #include <unistd.h>
    20  
    21  #include "test/util/save_util.h"
    22  
    23  #if defined(__x86_64__) || defined(__i386__)
    24  #define SYS_TRIGGER_SAVE SYS_create_module
    25  #elif defined(__aarch64__)
    26  #define SYS_TRIGGER_SAVE SYS_finit_module
    27  #else
    28  #error "Unknown architecture"
    29  #endif
    30  
    31  namespace gvisor {
    32  namespace testing {
    33  namespace internal {
    34  
    35  void DoCooperativeSave() {
    36    int orig_errno = errno;
    37    // We use it to trigger saving the sentry state
    38    // when this syscall is called.
    39    // Notice: this needs to be a valid syscall
    40    // that is not used in any of the syscall tests.
    41    syscall(SYS_TRIGGER_SAVE, nullptr, 0);
    42    errno = orig_errno;
    43  }
    44  
    45  }  // namespace internal
    46  }  // namespace testing
    47  }  // namespace gvisor
    48  
    49  #endif  // __linux__