github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/util/rlimit_util.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  #include "test/util/rlimit_util.h"
    16  
    17  #include <sys/resource.h>
    18  
    19  #include <cerrno>
    20  
    21  #include "test/util/cleanup.h"
    22  #include "test/util/logging.h"
    23  #include "test/util/posix_error.h"
    24  #include "test/util/test_util.h"
    25  
    26  namespace gvisor {
    27  namespace testing {
    28  
    29  PosixErrorOr<Cleanup> ScopedSetSoftRlimit(int resource, rlim_t newval) {
    30    struct rlimit old_rlim;
    31    if (getrlimit(resource, &old_rlim) != 0) {
    32      return PosixError(errno, "getrlimit failed");
    33    }
    34    struct rlimit new_rlim = old_rlim;
    35    new_rlim.rlim_cur = newval;
    36    if (setrlimit(resource, &new_rlim) != 0) {
    37      return PosixError(errno, "setrlimit failed");
    38    }
    39    return Cleanup([resource, old_rlim] {
    40      TEST_PCHECK(setrlimit(resource, &old_rlim) == 0);
    41    });
    42  }
    43  
    44  }  // namespace testing
    45  }  // namespace gvisor