github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/syscalls/linux/socket_unix_dgram.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/syscalls/linux/socket_unix_dgram.h"
    16  
    17  #include <stdio.h>
    18  #include <sys/un.h>
    19  
    20  #include "gtest/gtest.h"
    21  #include "absl/time/clock.h"
    22  #include "absl/time/time.h"
    23  #include "test/syscalls/linux/socket_test_util.h"
    24  #include "test/syscalls/linux/unix_domain_socket_test_util.h"
    25  #include "test/util/test_util.h"
    26  
    27  namespace gvisor {
    28  namespace testing {
    29  
    30  namespace {
    31  
    32  TEST_P(DgramUnixSocketPairTest, WriteOneSideClosed) {
    33    // FIXME(b/35925052): gVisor datagram sockets return EPIPE instead of
    34    // ECONNREFUSED.
    35    SKIP_IF(IsRunningOnGvisor());
    36  
    37    auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
    38    ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
    39    constexpr char kStr[] = "abc";
    40    ASSERT_THAT(write(sockets->second_fd(), kStr, 3),
    41                SyscallFailsWithErrno(ECONNREFUSED));
    42  }
    43  
    44  TEST_P(DgramUnixSocketPairTest, IncreasedSocketSendBufUnblocksWrites) {
    45    auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
    46    int sock = sockets->first_fd();
    47    int buf_size = 0;
    48    socklen_t buf_size_len = sizeof(buf_size);
    49    ASSERT_THAT(getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &buf_size, &buf_size_len),
    50                SyscallSucceeds());
    51    int opts;
    52    ASSERT_THAT(opts = fcntl(sock, F_GETFL), SyscallSucceeds());
    53    opts |= O_NONBLOCK;
    54    ASSERT_THAT(fcntl(sock, F_SETFL, opts), SyscallSucceeds());
    55  
    56    std::vector<char> buf(buf_size / 4);
    57    // Write till the socket buffer is full.
    58    while (RetryEINTR(send)(sock, buf.data(), buf.size(), 0) != -1) {
    59      // Sleep to give linux a chance to move data from the send buffer to the
    60      // receive buffer.
    61      absl::SleepFor(absl::Milliseconds(10));  // 10ms.
    62    }
    63    // The last error should have been EWOULDBLOCK.
    64    ASSERT_EQ(errno, EWOULDBLOCK);
    65  
    66    // Now increase the socket send buffer.
    67    buf_size = buf_size * 2;
    68    ASSERT_THAT(
    69        setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &buf_size, sizeof(buf_size)),
    70        SyscallSucceeds());
    71  
    72    // The send should succeed again.
    73    ASSERT_THAT(RetryEINTR(send)(sock, buf.data(), buf.size(), 0),
    74                SyscallSucceeds());
    75  }
    76  
    77  }  // namespace
    78  
    79  }  // namespace testing
    80  }  // namespace gvisor