| //===-- Unittests for dup3 ------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "src/errno/libc_errno.h" |
| #include "src/fcntl/open.h" |
| #include "src/unistd/close.h" |
| #include "src/unistd/dup3.h" |
| #include "src/unistd/read.h" |
| #include "src/unistd/unlink.h" |
| #include "src/unistd/write.h" |
| #include "test/UnitTest/ErrnoSetterMatcher.h" |
| #include "test/UnitTest/Test.h" |
| |
| // The tests here are exactly the same as those of dup2. We only test the |
| // plumbing of the dup3 syscall and not the dup3 functionality itself as it is |
| // a simple syscall wrapper. Testing dup3 functionality is beyond the scope of |
| // this test. |
| |
| TEST(LlvmLibcdupTest, ReadAndWriteViaDup) { |
| constexpr int DUPFD = 0xD0; |
| libc_errno = 0; |
| using __llvm_libc::testing::ErrnoSetterMatcher::Fails; |
| using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds; |
| constexpr const char *TEST_FILE = "testdata/dup3.test"; |
| int fd = __llvm_libc::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU); |
| ASSERT_EQ(libc_errno, 0); |
| ASSERT_GT(fd, 0); |
| int dupfd = __llvm_libc::dup3(fd, DUPFD, 0); |
| ASSERT_EQ(libc_errno, 0); |
| ASSERT_EQ(dupfd, DUPFD); |
| |
| // Write something via the dup |
| constexpr char WRITE_DATA[] = "Hello, dup!"; |
| constexpr size_t WRITE_SIZE = sizeof(WRITE_DATA); |
| ASSERT_EQ(ssize_t(WRITE_SIZE), |
| __llvm_libc::write(dupfd, WRITE_DATA, WRITE_SIZE)); |
| ASSERT_THAT(__llvm_libc::close(dupfd), Succeeds(0)); |
| |
| // Reopen the file for reading and create a dup. |
| fd = __llvm_libc::open(TEST_FILE, O_RDONLY); |
| ASSERT_EQ(libc_errno, 0); |
| ASSERT_GT(fd, 0); |
| dupfd = __llvm_libc::dup3(fd, DUPFD, 0); |
| ASSERT_EQ(libc_errno, 0); |
| ASSERT_EQ(dupfd, DUPFD); |
| |
| // Read the file content via the dup. |
| char buf[WRITE_SIZE]; |
| ASSERT_THAT(__llvm_libc::read(dupfd, buf, WRITE_SIZE), Succeeds(WRITE_SIZE)); |
| ASSERT_STREQ(buf, WRITE_DATA); |
| |
| // Verify that, unlike dup2, duping to the same fd value with dup3 fails. |
| ASSERT_THAT(__llvm_libc::dup3(dupfd, dupfd, 0), Fails(EINVAL)); |
| |
| ASSERT_THAT(__llvm_libc::close(dupfd), Succeeds(0)); |
| ASSERT_THAT(__llvm_libc::unlink(TEST_FILE), Succeeds(0)); |
| } |
| |
| TEST(LlvmLibcdupTest, DupBadFD) { |
| using __llvm_libc::testing::ErrnoSetterMatcher::Fails; |
| ASSERT_THAT(__llvm_libc::dup3(-1, 123, 0), Fails(EBADF)); |
| } |