650 lines
21 KiB
C++
650 lines
21 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 <fcntl.h> /* Obtain O_* constant definitions */
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#include <sys/ioctl.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include <vector>
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#include "gtest/gtest.h"
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#include "absl/strings/str_cat.h"
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#include "absl/synchronization/notification.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/util/file_descriptor.h"
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#include "test/util/posix_error.h"
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#include "test/util/temp_path.h"
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#include "test/util/test_util.h"
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#include "test/util/thread_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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// Used as a non-zero sentinel value, below.
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constexpr int kTestValue = 0x12345678;
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// Used for synchronization in race tests.
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const absl::Duration syncDelay = absl::Seconds(2);
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struct PipeCreator {
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std::string name_;
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// void (fds, is_blocking, is_namedpipe).
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std::function<void(int[2], bool*, bool*)> create_;
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};
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class PipeTest : public ::testing::TestWithParam<PipeCreator> {
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public:
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static void SetUpTestSuite() {
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// Tests intentionally generate SIGPIPE.
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TEST_PCHECK(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
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}
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// Initializes rfd_ and wfd_ as a blocking pipe.
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//
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// The return value indicates success: the test should be skipped otherwise.
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bool CreateBlocking() { return create(true); }
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// Initializes rfd_ and wfd_ as a non-blocking pipe.
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//
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// The return value is per CreateBlocking.
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bool CreateNonBlocking() { return create(false); }
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// Returns true iff the pipe represents a named pipe.
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bool IsNamedPipe() const { return named_pipe_; }
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int Size() const {
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int s1 = fcntl(rfd_.get(), F_GETPIPE_SZ);
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int s2 = fcntl(wfd_.get(), F_GETPIPE_SZ);
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EXPECT_GT(s1, 0);
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EXPECT_GT(s2, 0);
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EXPECT_EQ(s1, s2);
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return s1;
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}
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static void TearDownTestSuite() {
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TEST_PCHECK(signal(SIGPIPE, SIG_DFL) != SIG_ERR);
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}
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private:
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bool create(bool wants_blocking) {
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// Generate the pipe.
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int fds[2] = {-1, -1};
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bool is_blocking = false;
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GetParam().create_(fds, &is_blocking, &named_pipe_);
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if (fds[0] < 0 || fds[1] < 0) {
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return false;
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}
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// Save descriptors.
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rfd_.reset(fds[0]);
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wfd_.reset(fds[1]);
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// Adjust blocking, if needed.
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if (!is_blocking && wants_blocking) {
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// Clear the blocking flag.
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EXPECT_THAT(fcntl(fds[0], F_SETFL, 0), SyscallSucceeds());
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EXPECT_THAT(fcntl(fds[1], F_SETFL, 0), SyscallSucceeds());
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} else if (is_blocking && !wants_blocking) {
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// Set the descriptors to blocking.
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EXPECT_THAT(fcntl(fds[0], F_SETFL, O_NONBLOCK), SyscallSucceeds());
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EXPECT_THAT(fcntl(fds[1], F_SETFL, O_NONBLOCK), SyscallSucceeds());
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}
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return true;
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}
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protected:
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FileDescriptor rfd_;
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FileDescriptor wfd_;
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private:
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bool named_pipe_ = false;
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};
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TEST_P(PipeTest, Inode) {
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SKIP_IF(!CreateBlocking());
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// Ensure that the inode number is the same for each end.
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struct stat rst;
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ASSERT_THAT(fstat(rfd_.get(), &rst), SyscallSucceeds());
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struct stat wst;
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ASSERT_THAT(fstat(wfd_.get(), &wst), SyscallSucceeds());
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EXPECT_EQ(rst.st_ino, wst.st_ino);
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}
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TEST_P(PipeTest, Permissions) {
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SKIP_IF(!CreateBlocking());
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// Attempt bad operations.
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int buf = kTestValue;
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ASSERT_THAT(write(rfd_.get(), &buf, sizeof(buf)),
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SyscallFailsWithErrno(EBADF));
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EXPECT_THAT(read(wfd_.get(), &buf, sizeof(buf)),
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SyscallFailsWithErrno(EBADF));
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}
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TEST_P(PipeTest, Flags) {
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SKIP_IF(!CreateBlocking());
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if (IsNamedPipe()) {
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// May be stubbed to zero; define locally.
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constexpr int kLargefile = 0100000;
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EXPECT_THAT(fcntl(rfd_.get(), F_GETFL),
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SyscallSucceedsWithValue(kLargefile | O_RDONLY));
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EXPECT_THAT(fcntl(wfd_.get(), F_GETFL),
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SyscallSucceedsWithValue(kLargefile | O_WRONLY));
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} else {
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EXPECT_THAT(fcntl(rfd_.get(), F_GETFL), SyscallSucceedsWithValue(O_RDONLY));
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EXPECT_THAT(fcntl(wfd_.get(), F_GETFL), SyscallSucceedsWithValue(O_WRONLY));
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}
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}
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TEST_P(PipeTest, Write) {
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SKIP_IF(!CreateBlocking());
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int wbuf = kTestValue;
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int rbuf = ~kTestValue;
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ASSERT_THAT(write(wfd_.get(), &wbuf, sizeof(wbuf)),
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SyscallSucceedsWithValue(sizeof(wbuf)));
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ASSERT_THAT(read(rfd_.get(), &rbuf, sizeof(rbuf)),
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SyscallSucceedsWithValue(sizeof(rbuf)));
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EXPECT_EQ(wbuf, rbuf);
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}
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TEST_P(PipeTest, WritePage) {
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SKIP_IF(!CreateBlocking());
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std::vector<char> wbuf(kPageSize);
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RandomizeBuffer(wbuf.data(), wbuf.size());
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std::vector<char> rbuf(wbuf.size());
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ASSERT_THAT(write(wfd_.get(), wbuf.data(), wbuf.size()),
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SyscallSucceedsWithValue(wbuf.size()));
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ASSERT_THAT(read(rfd_.get(), rbuf.data(), rbuf.size()),
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SyscallSucceedsWithValue(rbuf.size()));
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EXPECT_EQ(memcmp(rbuf.data(), wbuf.data(), wbuf.size()), 0);
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}
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TEST_P(PipeTest, NonBlocking) {
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SKIP_IF(!CreateNonBlocking());
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int wbuf = kTestValue;
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int rbuf = ~kTestValue;
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EXPECT_THAT(read(rfd_.get(), &rbuf, sizeof(rbuf)),
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SyscallFailsWithErrno(EWOULDBLOCK));
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ASSERT_THAT(write(wfd_.get(), &wbuf, sizeof(wbuf)),
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SyscallSucceedsWithValue(sizeof(wbuf)));
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ASSERT_THAT(read(rfd_.get(), &rbuf, sizeof(rbuf)),
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SyscallSucceedsWithValue(sizeof(rbuf)));
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EXPECT_EQ(wbuf, rbuf);
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EXPECT_THAT(read(rfd_.get(), &rbuf, sizeof(rbuf)),
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SyscallFailsWithErrno(EWOULDBLOCK));
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}
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TEST(Pipe2Test, CloExec) {
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int fds[2];
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ASSERT_THAT(pipe2(fds, O_CLOEXEC), SyscallSucceeds());
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EXPECT_THAT(fcntl(fds[0], F_GETFD), SyscallSucceedsWithValue(FD_CLOEXEC));
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EXPECT_THAT(fcntl(fds[1], F_GETFD), SyscallSucceedsWithValue(FD_CLOEXEC));
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EXPECT_THAT(close(fds[0]), SyscallSucceeds());
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EXPECT_THAT(close(fds[1]), SyscallSucceeds());
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}
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TEST(Pipe2Test, BadOptions) {
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int fds[2];
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EXPECT_THAT(pipe2(fds, 0xDEAD), SyscallFailsWithErrno(EINVAL));
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}
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TEST_P(PipeTest, Seek) {
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SKIP_IF(!CreateBlocking());
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for (int i = 0; i < 4; i++) {
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// Attempt absolute seeks.
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EXPECT_THAT(lseek(rfd_.get(), 0, SEEK_SET), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(lseek(rfd_.get(), 4, SEEK_SET), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(lseek(wfd_.get(), 0, SEEK_SET), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(lseek(wfd_.get(), 4, SEEK_SET), SyscallFailsWithErrno(ESPIPE));
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// Attempt relative seeks.
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EXPECT_THAT(lseek(rfd_.get(), 0, SEEK_CUR), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(lseek(rfd_.get(), 4, SEEK_CUR), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(lseek(wfd_.get(), 0, SEEK_CUR), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(lseek(wfd_.get(), 4, SEEK_CUR), SyscallFailsWithErrno(ESPIPE));
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// Attempt end-of-file seeks.
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EXPECT_THAT(lseek(rfd_.get(), 0, SEEK_CUR), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(lseek(rfd_.get(), -4, SEEK_END), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(lseek(wfd_.get(), 0, SEEK_CUR), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(lseek(wfd_.get(), -4, SEEK_END), SyscallFailsWithErrno(ESPIPE));
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// Add some more data to the pipe.
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int buf = kTestValue;
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ASSERT_THAT(write(wfd_.get(), &buf, sizeof(buf)),
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SyscallSucceedsWithValue(sizeof(buf)));
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}
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}
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TEST_P(PipeTest, OffsetCalls) {
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SKIP_IF(!CreateBlocking());
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int buf;
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EXPECT_THAT(pread(wfd_.get(), &buf, sizeof(buf), 0),
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SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(pwrite(rfd_.get(), &buf, sizeof(buf), 0),
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SyscallFailsWithErrno(ESPIPE));
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struct iovec iov;
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EXPECT_THAT(preadv(wfd_.get(), &iov, 1, 0), SyscallFailsWithErrno(ESPIPE));
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EXPECT_THAT(pwritev(rfd_.get(), &iov, 1, 0), SyscallFailsWithErrno(ESPIPE));
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}
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TEST_P(PipeTest, WriterSideCloses) {
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SKIP_IF(!CreateBlocking());
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ScopedThread t([this]() {
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int buf = ~kTestValue;
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ASSERT_THAT(read(rfd_.get(), &buf, sizeof(buf)),
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SyscallSucceedsWithValue(sizeof(buf)));
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EXPECT_EQ(buf, kTestValue);
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// This will return when the close() completes.
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ASSERT_THAT(read(rfd_.get(), &buf, sizeof(buf)), SyscallSucceeds());
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// This will return straight away.
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ASSERT_THAT(read(rfd_.get(), &buf, sizeof(buf)),
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SyscallSucceedsWithValue(0));
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});
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// Sleep a bit so the thread can block.
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absl::SleepFor(syncDelay);
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// Write to unblock.
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int buf = kTestValue;
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ASSERT_THAT(write(wfd_.get(), &buf, sizeof(buf)),
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SyscallSucceedsWithValue(sizeof(buf)));
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// Sleep a bit so the thread can block again.
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absl::SleepFor(syncDelay);
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// Allow the thread to complete.
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ASSERT_THAT(close(wfd_.release()), SyscallSucceeds());
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t.Join();
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}
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TEST_P(PipeTest, WriterSideClosesReadDataFirst) {
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SKIP_IF(!CreateBlocking());
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int wbuf = kTestValue;
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ASSERT_THAT(write(wfd_.get(), &wbuf, sizeof(wbuf)),
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SyscallSucceedsWithValue(sizeof(wbuf)));
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ASSERT_THAT(close(wfd_.release()), SyscallSucceeds());
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int rbuf;
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ASSERT_THAT(read(rfd_.get(), &rbuf, sizeof(rbuf)),
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SyscallSucceedsWithValue(sizeof(rbuf)));
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EXPECT_EQ(wbuf, rbuf);
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EXPECT_THAT(read(rfd_.get(), &rbuf, sizeof(rbuf)),
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SyscallSucceedsWithValue(0));
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}
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TEST_P(PipeTest, ReaderSideCloses) {
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SKIP_IF(!CreateBlocking());
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ASSERT_THAT(close(rfd_.release()), SyscallSucceeds());
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int buf = kTestValue;
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EXPECT_THAT(write(wfd_.get(), &buf, sizeof(buf)),
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SyscallFailsWithErrno(EPIPE));
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}
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TEST_P(PipeTest, CloseTwice) {
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SKIP_IF(!CreateBlocking());
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int reader = rfd_.release();
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int writer = wfd_.release();
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ASSERT_THAT(close(reader), SyscallSucceeds());
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ASSERT_THAT(close(writer), SyscallSucceeds());
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EXPECT_THAT(close(reader), SyscallFailsWithErrno(EBADF));
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EXPECT_THAT(close(writer), SyscallFailsWithErrno(EBADF));
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}
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// Blocking write returns EPIPE when read end is closed if nothing has been
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// written.
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TEST_P(PipeTest, BlockWriteClosed) {
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SKIP_IF(!CreateBlocking());
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absl::Notification notify;
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ScopedThread t([this, ¬ify]() {
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std::vector<char> buf(Size());
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// Exactly fill the pipe buffer.
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ASSERT_THAT(WriteFd(wfd_.get(), buf.data(), buf.size()),
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SyscallSucceedsWithValue(buf.size()));
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notify.Notify();
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// Attempt to write one more byte. Blocks.
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// N.B. Don't use WriteFd, we don't want a retry.
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EXPECT_THAT(write(wfd_.get(), buf.data(), 1), SyscallFailsWithErrno(EPIPE));
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});
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notify.WaitForNotification();
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ASSERT_THAT(close(rfd_.release()), SyscallSucceeds());
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t.Join();
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}
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// Blocking write returns EPIPE when read end is closed even if something has
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// been written.
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TEST_P(PipeTest, BlockPartialWriteClosed) {
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SKIP_IF(!CreateBlocking());
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ScopedThread t([this]() {
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const int pipe_size = Size();
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std::vector<char> buf(2 * pipe_size);
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// Write more than fits in the buffer. Blocks then returns partial write
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// when the other end is closed. The next call returns EPIPE.
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ASSERT_THAT(write(wfd_.get(), buf.data(), buf.size()),
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SyscallSucceedsWithValue(pipe_size));
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EXPECT_THAT(write(wfd_.get(), buf.data(), buf.size()),
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SyscallFailsWithErrno(EPIPE));
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});
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// Leave time for write to become blocked.
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absl::SleepFor(syncDelay);
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// Unblock the above.
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ASSERT_THAT(close(rfd_.release()), SyscallSucceeds());
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t.Join();
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}
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TEST_P(PipeTest, ReadFromClosedFd_NoRandomSave) {
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SKIP_IF(!CreateBlocking());
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absl::Notification notify;
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ScopedThread t([this, ¬ify]() {
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notify.Notify();
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int buf;
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ASSERT_THAT(read(rfd_.get(), &buf, sizeof(buf)),
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SyscallSucceedsWithValue(sizeof(buf)));
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ASSERT_EQ(kTestValue, buf);
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});
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notify.WaitForNotification();
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// Make sure that the thread gets to read().
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absl::SleepFor(syncDelay);
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{
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// We cannot save/restore here as the read end of pipe is closed but there
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// is ongoing read() above. We will not be able to restart the read()
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// successfully in restore run since the read fd is closed.
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const DisableSave ds;
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ASSERT_THAT(close(rfd_.release()), SyscallSucceeds());
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int buf = kTestValue;
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ASSERT_THAT(write(wfd_.get(), &buf, sizeof(buf)),
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SyscallSucceedsWithValue(sizeof(buf)));
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t.Join();
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}
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}
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TEST_P(PipeTest, FionRead) {
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SKIP_IF(!CreateBlocking());
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int n;
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ASSERT_THAT(ioctl(rfd_.get(), FIONREAD, &n), SyscallSucceedsWithValue(0));
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EXPECT_EQ(n, 0);
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ASSERT_THAT(ioctl(wfd_.get(), FIONREAD, &n), SyscallSucceedsWithValue(0));
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EXPECT_EQ(n, 0);
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std::vector<char> buf(Size());
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ASSERT_THAT(write(wfd_.get(), buf.data(), buf.size()),
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SyscallSucceedsWithValue(buf.size()));
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EXPECT_THAT(ioctl(rfd_.get(), FIONREAD, &n), SyscallSucceedsWithValue(0));
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EXPECT_EQ(n, buf.size());
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EXPECT_THAT(ioctl(wfd_.get(), FIONREAD, &n), SyscallSucceedsWithValue(0));
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EXPECT_EQ(n, buf.size());
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}
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// Test that opening an empty anonymous pipe RDONLY via /proc/self/fd/N does not
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// block waiting for a writer.
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TEST_P(PipeTest, OpenViaProcSelfFD) {
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SKIP_IF(!CreateBlocking());
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SKIP_IF(IsNamedPipe());
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// Close the write end of the pipe.
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ASSERT_THAT(close(wfd_.release()), SyscallSucceeds());
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// Open other side via /proc/self/fd. It should not block.
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FileDescriptor proc_self_fd = ASSERT_NO_ERRNO_AND_VALUE(
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Open(absl::StrCat("/proc/self/fd/", rfd_.get()), O_RDONLY));
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}
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// Test that opening and reading from an anonymous pipe (with existing writes)
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// RDONLY via /proc/self/fd/N returns the existing data.
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TEST_P(PipeTest, OpenViaProcSelfFDWithWrites) {
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SKIP_IF(!CreateBlocking());
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SKIP_IF(IsNamedPipe());
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// Write to the pipe and then close the write fd.
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int wbuf = kTestValue;
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ASSERT_THAT(write(wfd_.get(), &wbuf, sizeof(wbuf)),
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SyscallSucceedsWithValue(sizeof(wbuf)));
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ASSERT_THAT(close(wfd_.release()), SyscallSucceeds());
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// Open read side via /proc/self/fd, and read from it.
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FileDescriptor proc_self_fd = ASSERT_NO_ERRNO_AND_VALUE(
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Open(absl::StrCat("/proc/self/fd/", rfd_.get()), O_RDONLY));
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int rbuf;
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ASSERT_THAT(read(proc_self_fd.get(), &rbuf, sizeof(rbuf)),
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SyscallSucceedsWithValue(sizeof(rbuf)));
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EXPECT_EQ(wbuf, rbuf);
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}
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// Test that accesses of /proc/<PID>/fd correctly decrement the refcount.
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TEST_P(PipeTest, ProcFDReleasesFile) {
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SKIP_IF(!CreateBlocking());
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// Stat the pipe FD, which shouldn't alter the refcount.
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struct stat wst;
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ASSERT_THAT(lstat(absl::StrCat("/proc/self/fd/", wfd_.get()).c_str(), &wst),
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SyscallSucceeds());
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// Close the write end and ensure that read indicates EOF.
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wfd_.reset();
|
|
char buf;
|
|
ASSERT_THAT(read(rfd_.get(), &buf, 1), SyscallSucceedsWithValue(0));
|
|
}
|
|
|
|
// Same for /proc/<PID>/fdinfo.
|
|
TEST_P(PipeTest, ProcFDInfoReleasesFile) {
|
|
SKIP_IF(!CreateBlocking());
|
|
|
|
// Stat the pipe FD, which shouldn't alter the refcount.
|
|
struct stat wst;
|
|
ASSERT_THAT(
|
|
lstat(absl::StrCat("/proc/self/fdinfo/", wfd_.get()).c_str(), &wst),
|
|
SyscallSucceeds());
|
|
|
|
// Close the write end and ensure that read indicates EOF.
|
|
wfd_.reset();
|
|
char buf;
|
|
ASSERT_THAT(read(rfd_.get(), &buf, 1), SyscallSucceedsWithValue(0));
|
|
}
|
|
|
|
TEST_P(PipeTest, SizeChange) {
|
|
SKIP_IF(!CreateBlocking());
|
|
|
|
// Set the minimum possible size.
|
|
ASSERT_THAT(fcntl(rfd_.get(), F_SETPIPE_SZ, 0), SyscallSucceeds());
|
|
int min = Size();
|
|
EXPECT_GT(min, 0); // Should be rounded up.
|
|
|
|
// Set from the read end.
|
|
ASSERT_THAT(fcntl(rfd_.get(), F_SETPIPE_SZ, min + 1), SyscallSucceeds());
|
|
int med = Size();
|
|
EXPECT_GT(med, min); // Should have grown, may be rounded.
|
|
|
|
// Set from the write end.
|
|
ASSERT_THAT(fcntl(wfd_.get(), F_SETPIPE_SZ, med + 1), SyscallSucceeds());
|
|
int max = Size();
|
|
EXPECT_GT(max, med); // Ditto.
|
|
}
|
|
|
|
TEST_P(PipeTest, SizeChangeMax) {
|
|
SKIP_IF(!CreateBlocking());
|
|
|
|
// Assert there's some maximum.
|
|
EXPECT_THAT(fcntl(rfd_.get(), F_SETPIPE_SZ, 0x7fffffffffffffff),
|
|
SyscallFailsWithErrno(EINVAL));
|
|
EXPECT_THAT(fcntl(wfd_.get(), F_SETPIPE_SZ, 0x7fffffffffffffff),
|
|
SyscallFailsWithErrno(EINVAL));
|
|
}
|
|
|
|
TEST_P(PipeTest, SizeChangeFull) {
|
|
SKIP_IF(!CreateBlocking());
|
|
|
|
// Ensure that we adjust to a large enough size to avoid rounding when we
|
|
// perform the size decrease. If rounding occurs, we may not actually
|
|
// adjust the size and the call below will return success. It was found via
|
|
// experimentation that this granularity avoids the rounding for Linux.
|
|
constexpr int kDelta = 64 * 1024;
|
|
ASSERT_THAT(fcntl(wfd_.get(), F_SETPIPE_SZ, Size() + kDelta),
|
|
SyscallSucceeds());
|
|
|
|
// Fill the buffer and try to change down.
|
|
std::vector<char> buf(Size());
|
|
ASSERT_THAT(write(wfd_.get(), buf.data(), buf.size()),
|
|
SyscallSucceedsWithValue(buf.size()));
|
|
EXPECT_THAT(fcntl(wfd_.get(), F_SETPIPE_SZ, Size() - kDelta),
|
|
SyscallFailsWithErrno(EBUSY));
|
|
}
|
|
|
|
TEST_P(PipeTest, Streaming) {
|
|
SKIP_IF(!CreateBlocking());
|
|
|
|
// We make too many calls to go through full save cycles.
|
|
DisableSave ds;
|
|
|
|
// Size() requires 2 syscalls, call it once and remember the value.
|
|
const int pipe_size = Size();
|
|
|
|
absl::Notification notify;
|
|
ScopedThread t([this, ¬ify, pipe_size]() {
|
|
// Don't start until it's full.
|
|
notify.WaitForNotification();
|
|
for (int i = 0; i < pipe_size; i++) {
|
|
int rbuf;
|
|
ASSERT_THAT(read(rfd_.get(), &rbuf, sizeof(rbuf)),
|
|
SyscallSucceedsWithValue(sizeof(rbuf)));
|
|
EXPECT_EQ(rbuf, i);
|
|
}
|
|
});
|
|
|
|
// Write 4 bytes * pipe_size. It will fill up the pipe once, notify the reader
|
|
// to start. Then we write pipe size worth 3 more times to ensure the reader
|
|
// can follow along.
|
|
ssize_t total = 0;
|
|
for (int i = 0; i < pipe_size; i++) {
|
|
ssize_t written = write(wfd_.get(), &i, sizeof(i));
|
|
ASSERT_THAT(written, SyscallSucceedsWithValue(sizeof(i)));
|
|
total += written;
|
|
|
|
// Is the next write about to fill up the buffer? Wake up the reader once.
|
|
if (total < pipe_size && (total + written) >= pipe_size) {
|
|
notify.Notify();
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string PipeCreatorName(::testing::TestParamInfo<PipeCreator> info) {
|
|
return info.param.name_; // Use the name specified.
|
|
}
|
|
|
|
INSTANTIATE_TEST_SUITE_P(
|
|
Pipes, PipeTest,
|
|
::testing::Values(
|
|
PipeCreator{
|
|
"pipe",
|
|
[](int fds[2], bool* is_blocking, bool* is_namedpipe) {
|
|
ASSERT_THAT(pipe(fds), SyscallSucceeds());
|
|
*is_blocking = true;
|
|
*is_namedpipe = false;
|
|
},
|
|
},
|
|
PipeCreator{
|
|
"pipe2blocking",
|
|
[](int fds[2], bool* is_blocking, bool* is_namedpipe) {
|
|
ASSERT_THAT(pipe2(fds, 0), SyscallSucceeds());
|
|
*is_blocking = true;
|
|
*is_namedpipe = false;
|
|
},
|
|
},
|
|
PipeCreator{
|
|
"pipe2nonblocking",
|
|
[](int fds[2], bool* is_blocking, bool* is_namedpipe) {
|
|
ASSERT_THAT(pipe2(fds, O_NONBLOCK), SyscallSucceeds());
|
|
*is_blocking = false;
|
|
*is_namedpipe = false;
|
|
},
|
|
},
|
|
PipeCreator{
|
|
"smallbuffer",
|
|
[](int fds[2], bool* is_blocking, bool* is_namedpipe) {
|
|
// Set to the minimum available size (will round up).
|
|
ASSERT_THAT(pipe(fds), SyscallSucceeds());
|
|
ASSERT_THAT(fcntl(fds[0], F_SETPIPE_SZ, 0), SyscallSucceeds());
|
|
*is_blocking = true;
|
|
*is_namedpipe = false;
|
|
},
|
|
},
|
|
PipeCreator{
|
|
"namednonblocking",
|
|
[](int fds[2], bool* is_blocking, bool* is_namedpipe) {
|
|
// Create a new file-based pipe (non-blocking).
|
|
auto file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
|
|
ASSERT_THAT(unlink(file.path().c_str()), SyscallSucceeds());
|
|
SKIP_IF(mkfifo(file.path().c_str(), 0644) != 0);
|
|
fds[0] = open(file.path().c_str(), O_NONBLOCK | O_RDONLY);
|
|
fds[1] = open(file.path().c_str(), O_NONBLOCK | O_WRONLY);
|
|
MaybeSave();
|
|
*is_blocking = false;
|
|
*is_namedpipe = true;
|
|
},
|
|
},
|
|
PipeCreator{
|
|
"namedblocking",
|
|
[](int fds[2], bool* is_blocking, bool* is_namedpipe) {
|
|
// Create a new file-based pipe (blocking).
|
|
auto file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
|
|
ASSERT_THAT(unlink(file.path().c_str()), SyscallSucceeds());
|
|
SKIP_IF(mkfifo(file.path().c_str(), 0644) != 0);
|
|
ScopedThread t([&file, &fds]() {
|
|
fds[1] = open(file.path().c_str(), O_WRONLY);
|
|
});
|
|
fds[0] = open(file.path().c_str(), O_RDONLY);
|
|
t.Join();
|
|
MaybeSave();
|
|
*is_blocking = true;
|
|
*is_namedpipe = true;
|
|
},
|
|
}),
|
|
PipeCreatorName);
|
|
|
|
} // namespace
|
|
} // namespace testing
|
|
} // namespace gvisor
|