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

     1  // Copyright 2018 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/epoll_util.h"
    16  
    17  #include <sys/epoll.h>
    18  
    19  #include "gmock/gmock.h"
    20  #include "test/util/file_descriptor.h"
    21  #include "test/util/posix_error.h"
    22  #include "test/util/save_util.h"
    23  
    24  namespace gvisor {
    25  namespace testing {
    26  
    27  PosixErrorOr<FileDescriptor> NewEpollFD(int size) {
    28    // "Since Linux 2.6.8, the size argument is ignored, but must be greater than
    29    // zero." - epoll_create(2)
    30    int fd = epoll_create(size);
    31    MaybeSave();
    32    if (fd < 0) {
    33      return PosixError(errno, "epoll_create");
    34    }
    35    return FileDescriptor(fd);
    36  }
    37  
    38  PosixError RegisterEpollFD(int epoll_fd, int target_fd, int events,
    39                             uint64_t data) {
    40    struct epoll_event event;
    41    event.events = events;
    42    event.data.u64 = data;
    43    int rc = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, target_fd, &event);
    44    MaybeSave();
    45    if (rc < 0) {
    46      return PosixError(errno, "epoll_ctl");
    47    }
    48    return NoError();
    49  }
    50  
    51  }  // namespace testing
    52  }  // namespace gvisor