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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "test/syscalls/linux/socket_unix_dgram.h"
#include <stdio.h>
#include <sys/un.h>
#include "gtest/gtest.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "test/syscalls/linux/unix_domain_socket_test_util.h"
#include "test/util/socket_util.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
TEST_P(DgramUnixSocketPairTest, WriteOneSideClosed) {
// FIXME(b/35925052): gVisor datagram sockets return EPIPE instead of
// ECONNREFUSED.
SKIP_IF(IsRunningOnGvisor());
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
constexpr char kStr[] = "abc";
ASSERT_THAT(write(sockets->second_fd(), kStr, 3),
SyscallFailsWithErrno(ECONNREFUSED));
}
TEST_P(DgramUnixSocketPairTest, IncreasedSocketSendBufUnblocksWrites) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
int sock = sockets->first_fd();
int buf_size = 0;
socklen_t buf_size_len = sizeof(buf_size);
ASSERT_THAT(getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &buf_size, &buf_size_len),
SyscallSucceeds());
int opts;
ASSERT_THAT(opts = fcntl(sock, F_GETFL), SyscallSucceeds());
opts |= O_NONBLOCK;
ASSERT_THAT(fcntl(sock, F_SETFL, opts), SyscallSucceeds());
std::vector<char> buf(buf_size / 4);
// Write till the socket buffer is full.
while (RetryEINTR(send)(sock, buf.data(), buf.size(), 0) != -1) {
// Sleep to give linux a chance to move data from the send buffer to the
// receive buffer.
absl::SleepFor(absl::Milliseconds(10)); // 10ms.
}
// The last error should have been EWOULDBLOCK.
ASSERT_EQ(errno, EWOULDBLOCK);
// Now increase the socket send buffer.
buf_size = buf_size * 2;
ASSERT_THAT(
setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &buf_size, sizeof(buf_size)),
SyscallSucceeds());
// The send should succeed again.
ASSERT_THAT(RetryEINTR(send)(sock, buf.data(), buf.size(), 0),
SyscallSucceeds());
}
} // namespace
} // namespace testing
} // namespace gvisor
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