237 lines
8.0 KiB
C++
237 lines
8.0 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <poll.h>
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#include <stdio.h>
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#include <sys/un.h>
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#include "gtest/gtest.h"
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#include "absl/time/clock.h"
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#include "absl/time/time.h"
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#include "test/syscalls/linux/socket_test_util.h"
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#include "test/syscalls/linux/unix_domain_socket_test_util.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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// Test fixture for tests that apply to pairs of connected stream unix sockets.
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using StreamUnixSocketPairTest = SocketPairTest;
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TEST_P(StreamUnixSocketPairTest, WriteOneSideClosed) {
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auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
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ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
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constexpr char kStr[] = "abc";
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ASSERT_THAT(write(sockets->second_fd(), kStr, 3),
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SyscallFailsWithErrno(EPIPE));
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}
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TEST_P(StreamUnixSocketPairTest, ReadOneSideClosed) {
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auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
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ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
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char data[10] = {};
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ASSERT_THAT(read(sockets->second_fd(), data, sizeof(data)),
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SyscallSucceedsWithValue(0));
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}
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TEST_P(StreamUnixSocketPairTest, RecvmsgOneSideClosed) {
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auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
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// Set timeout so that it will not wait for ever.
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struct timeval tv {
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.tv_sec = 0, .tv_usec = 10
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};
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EXPECT_THAT(setsockopt(sockets->second_fd(), SOL_SOCKET, SO_RCVTIMEO, &tv,
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sizeof(tv)),
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SyscallSucceeds());
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ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
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char received_data[10] = {};
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struct iovec iov;
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iov.iov_base = received_data;
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iov.iov_len = sizeof(received_data);
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struct msghdr msg = {};
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msg.msg_flags = -1;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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ASSERT_THAT(recvmsg(sockets->second_fd(), &msg, MSG_WAITALL),
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SyscallSucceedsWithValue(0));
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}
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TEST_P(StreamUnixSocketPairTest, ReadOneSideClosedWithUnreadData) {
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auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
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char buf[10] = {};
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ASSERT_THAT(RetryEINTR(write)(sockets->second_fd(), buf, sizeof(buf)),
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SyscallSucceedsWithValue(sizeof(buf)));
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ASSERT_THAT(shutdown(sockets->first_fd(), SHUT_RDWR), SyscallSucceeds());
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ASSERT_THAT(RetryEINTR(read)(sockets->second_fd(), buf, sizeof(buf)),
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SyscallSucceedsWithValue(0));
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ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
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ASSERT_THAT(RetryEINTR(read)(sockets->second_fd(), buf, sizeof(buf)),
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SyscallFailsWithErrno(ECONNRESET));
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}
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TEST_P(StreamUnixSocketPairTest, Sendto) {
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auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
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struct sockaddr_un addr = {};
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addr.sun_family = AF_UNIX;
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constexpr char kPath[] = "\0nonexistent";
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memcpy(addr.sun_path, kPath, sizeof(kPath));
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constexpr char kStr[] = "abc";
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ASSERT_THAT(sendto(sockets->second_fd(), kStr, 3, 0, (struct sockaddr*)&addr,
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sizeof(addr)),
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SyscallFailsWithErrno(EISCONN));
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}
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TEST_P(StreamUnixSocketPairTest, SetAndGetSocketLinger) {
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auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
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struct linger sl = {1, 5};
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EXPECT_THAT(
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setsockopt(sockets->first_fd(), SOL_SOCKET, SO_LINGER, &sl, sizeof(sl)),
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SyscallSucceedsWithValue(0));
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struct linger got_linger = {};
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socklen_t length = sizeof(sl);
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EXPECT_THAT(getsockopt(sockets->first_fd(), SOL_SOCKET, SO_LINGER,
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&got_linger, &length),
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SyscallSucceedsWithValue(0));
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ASSERT_EQ(length, sizeof(got_linger));
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EXPECT_EQ(0, memcmp(&got_linger, &sl, length));
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}
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TEST_P(StreamUnixSocketPairTest, GetSocketAcceptConn) {
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auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
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int got = -1;
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socklen_t length = sizeof(got);
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ASSERT_THAT(
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getsockopt(sockets->first_fd(), SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
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SyscallSucceedsWithValue(0));
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ASSERT_EQ(length, sizeof(got));
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EXPECT_EQ(got, 0);
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}
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TEST_P(StreamUnixSocketPairTest, SetSocketSendBuf) {
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auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
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auto s = sockets->first_fd();
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int max = 0;
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int min = 0;
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{
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// Discover maxmimum buffer size by setting to a really large value.
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constexpr int kRcvBufSz = INT_MAX;
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ASSERT_THAT(
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setsockopt(s, SOL_SOCKET, SO_SNDBUF, &kRcvBufSz, sizeof(kRcvBufSz)),
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SyscallSucceeds());
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max = 0;
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socklen_t max_len = sizeof(max);
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ASSERT_THAT(getsockopt(s, SOL_SOCKET, SO_SNDBUF, &max, &max_len),
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SyscallSucceeds());
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}
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{
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// Discover minimum buffer size by setting it to zero.
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constexpr int kRcvBufSz = 0;
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ASSERT_THAT(
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setsockopt(s, SOL_SOCKET, SO_SNDBUF, &kRcvBufSz, sizeof(kRcvBufSz)),
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SyscallSucceeds());
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socklen_t min_len = sizeof(min);
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ASSERT_THAT(getsockopt(s, SOL_SOCKET, SO_SNDBUF, &min, &min_len),
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SyscallSucceeds());
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}
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int quarter_sz = min + (max - min) / 4;
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ASSERT_THAT(
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setsockopt(s, SOL_SOCKET, SO_SNDBUF, &quarter_sz, sizeof(quarter_sz)),
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SyscallSucceeds());
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int val = 0;
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socklen_t val_len = sizeof(val);
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ASSERT_THAT(getsockopt(s, SOL_SOCKET, SO_SNDBUF, &val, &val_len),
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SyscallSucceeds());
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// Linux doubles the value set by SO_SNDBUF/SO_SNDBUF.
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quarter_sz *= 2;
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ASSERT_EQ(quarter_sz, val);
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}
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TEST_P(StreamUnixSocketPairTest, IncreasedSocketSendBufUnblocksWrites) {
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auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
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int sock = sockets->first_fd();
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int buf_size = 0;
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socklen_t buf_size_len = sizeof(buf_size);
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ASSERT_THAT(getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &buf_size, &buf_size_len),
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SyscallSucceeds());
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int opts;
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ASSERT_THAT(opts = fcntl(sock, F_GETFL), SyscallSucceeds());
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opts |= O_NONBLOCK;
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ASSERT_THAT(fcntl(sock, F_SETFL, opts), SyscallSucceeds());
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std::vector<char> buf(buf_size / 4);
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// Write till the socket buffer is full.
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while (RetryEINTR(send)(sock, buf.data(), buf.size(), 0) != -1) {
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// Sleep to give linux a chance to move data from the send buffer to the
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// receive buffer.
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absl::SleepFor(absl::Milliseconds(10)); // 10ms.
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}
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// The last error should have been EWOULDBLOCK.
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ASSERT_EQ(errno, EWOULDBLOCK);
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// Now increase the socket send buffer.
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buf_size = buf_size * 2;
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ASSERT_THAT(
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setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &buf_size, sizeof(buf_size)),
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SyscallSucceeds());
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// The send should succeed again.
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ASSERT_THAT(RetryEINTR(send)(sock, buf.data(), buf.size(), 0),
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SyscallSucceeds());
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}
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INSTANTIATE_TEST_SUITE_P(
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AllUnixDomainSockets, StreamUnixSocketPairTest,
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::testing::ValuesIn(IncludeReversals(VecCat<SocketPairKind>(
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ApplyVec<SocketPairKind>(UnixDomainSocketPair,
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AllBitwiseCombinations(List<int>{SOCK_STREAM},
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List<int>{
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0, SOCK_NONBLOCK})),
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ApplyVec<SocketPairKind>(FilesystemBoundUnixDomainSocketPair,
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AllBitwiseCombinations(List<int>{SOCK_STREAM},
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List<int>{
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0, SOCK_NONBLOCK})),
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ApplyVec<SocketPairKind>(
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AbstractBoundUnixDomainSocketPair,
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AllBitwiseCombinations(List<int>{SOCK_STREAM},
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List<int>{0, SOCK_NONBLOCK}))))));
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} // namespace
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} // namespace testing
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} // namespace gvisor
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