gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/test/util/eventfd_util.h (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  #ifndef GVISOR_TEST_UTIL_EVENTFD_UTIL_H_
    16  #define GVISOR_TEST_UTIL_EVENTFD_UTIL_H_
    17  #include <asm/unistd.h>
    18  #include <sys/eventfd.h>
    19  
    20  #include <cerrno>
    21  
    22  #include "test/util/file_descriptor.h"
    23  #include "test/util/posix_error.h"
    24  #include "test/util/save_util.h"
    25  
    26  namespace gvisor {
    27  namespace testing {
    28  
    29  // Returns a new eventfd with the given initial value and flags.
    30  inline PosixErrorOr<FileDescriptor> NewEventFD(unsigned int initval = 0,
    31                                                 int flags = 0) {
    32    int fd = eventfd(initval, flags);
    33    MaybeSave();
    34    if (fd < 0) {
    35      return PosixError(errno, "eventfd");
    36    }
    37    return FileDescriptor(fd);
    38  }
    39  
    40  // This is a wrapper for the eventfd2(2) system call.
    41  inline int Eventdfd2Setup(unsigned int initval, int flags) {
    42    return syscall(__NR_eventfd2, initval, flags);
    43  }
    44  
    45  }  // namespace testing
    46  }  // namespace gvisor
    47  
    48  #endif  // GVISOR_TEST_UTIL_EVENTFD_UTIL_H_