libc/test/src/unistd/dup_test.cpp

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