| 1 | //===-- Unittests for dup -------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/fcntl/open.h" |
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| 10 | #include "src/unistd/close.h" |
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| 11 | #include "src/unistd/dup2.h" |
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| 12 | #include "src/unistd/read.h" |
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| 13 | #include "src/unistd/unlink.h" |
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| 14 | #include "src/unistd/write.h" |
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| 15 | #include "test/UnitTest/ErrnoCheckingTest.h" |
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| 16 | #include "test/UnitTest/ErrnoSetterMatcher.h" |
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| 17 | #include "test/UnitTest/Test.h" |
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| 18 | |
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| 19 | #include <sys/stat.h> |
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| 20 | |
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| 21 | using LlvmLibcdupTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest; |
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| 22 | |
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| 23 | TEST_F(LlvmLibcdupTest, ReadAndWriteViaDup) { |
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| 24 | constexpr int DUPFD = 0xD0; |
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| 25 | using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds; |
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| 26 | constexpr const char *FILENAME = "dup2.test" ; |
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| 27 | auto TEST_FILE = libc_make_test_file_path(FILENAME); |
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| 28 | int fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU); |
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| 29 | ASSERT_ERRNO_SUCCESS(); |
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| 30 | ASSERT_GT(fd, 0); |
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| 31 | int dupfd = LIBC_NAMESPACE::dup2(fd, DUPFD); |
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| 32 | ASSERT_ERRNO_SUCCESS(); |
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| 33 | ASSERT_EQ(dupfd, DUPFD); |
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| 34 | |
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| 35 | // Write something via the dup |
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| 36 | constexpr char WRITE_DATA[] = "Hello, dup!" ; |
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| 37 | constexpr size_t WRITE_SIZE = sizeof(WRITE_DATA); |
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| 38 | ASSERT_EQ(ssize_t(WRITE_SIZE), |
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| 39 | LIBC_NAMESPACE::write(dupfd, WRITE_DATA, WRITE_SIZE)); |
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| 40 | ASSERT_THAT(LIBC_NAMESPACE::close(dupfd), Succeeds(0)); |
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| 41 | |
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| 42 | // Reopen the file for reading and create a dup. |
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| 43 | fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY); |
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| 44 | ASSERT_ERRNO_SUCCESS(); |
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| 45 | ASSERT_GT(fd, 0); |
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| 46 | dupfd = LIBC_NAMESPACE::dup2(fd, DUPFD); |
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| 47 | ASSERT_ERRNO_SUCCESS(); |
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| 48 | ASSERT_EQ(dupfd, DUPFD); |
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| 49 | |
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| 50 | // Read the file content via the dup. |
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| 51 | char buf[WRITE_SIZE]; |
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| 52 | ASSERT_THAT(LIBC_NAMESPACE::read(dupfd, buf, WRITE_SIZE), |
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| 53 | Succeeds(WRITE_SIZE)); |
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| 54 | ASSERT_STREQ(buf, WRITE_DATA); |
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| 55 | |
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| 56 | // Verify that duping to the same fd value succeeds. |
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| 57 | ASSERT_THAT(LIBC_NAMESPACE::dup2(dupfd, dupfd), Succeeds(dupfd)); |
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| 58 | |
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| 59 | ASSERT_THAT(LIBC_NAMESPACE::close(dupfd), Succeeds(0)); |
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| 60 | ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0)); |
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| 61 | } |
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| 62 | |
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| 63 | TEST_F(LlvmLibcdupTest, DupBadFD) { |
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| 64 | using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails; |
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| 65 | ASSERT_THAT(LIBC_NAMESPACE::dup2(-1, 123), Fails(EBADF)); |
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| 66 | } |
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| 67 | |
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