libc/test/src/unistd/read_write_test.cpp

   1 //===-- Unittests for read and write --------------------------------------===//
   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/errno/libc_errno.h"
  10 #include "src/fcntl/open.h"
  11 #include "src/stdio/remove.h"
  12 #include "src/unistd/close.h"
  13 #include "src/unistd/fsync.h"
  14 #include "src/unistd/read.h"
  15 #include "src/unistd/write.h"
  16 #include "test/UnitTest/ErrnoSetterMatcher.h"
  17 #include "test/UnitTest/Test.h"
  18
  19 #include <sys/stat.h>
  20
  21 TEST(LlvmLibcUniStd, WriteAndReadBackTest) {
  22   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  23   constexpr const char *FILENAME = "__unistd_read_write.test";
  24   auto TEST_FILE = libc_make_test_file_path(FILENAME);
  25
  26   int write_fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
  27   ASSERT_ERRNO_SUCCESS();
  28   ASSERT_GT(write_fd, 0);
  29   constexpr const char HELLO[] = "hello";
  30   constexpr int HELLO_SIZE = sizeof(HELLO);
  31   ASSERT_THAT(LIBC_NAMESPACE::write(write_fd, HELLO, HELLO_SIZE),
  32               Succeeds(HELLO_SIZE));
  33   ASSERT_THAT(LIBC_NAMESPACE::fsync(write_fd), Succeeds(0));
  34   ASSERT_THAT(LIBC_NAMESPACE::close(write_fd), Succeeds(0));
  35
  36   int read_fd = LIBC_NAMESPACE::open(TEST_FILE, O_RDONLY);
  37   ASSERT_ERRNO_SUCCESS();
  38   ASSERT_GT(read_fd, 0);
  39   char read_buf[10];
  40   ASSERT_THAT(LIBC_NAMESPACE::read(read_fd, read_buf, HELLO_SIZE),
  41               Succeeds(HELLO_SIZE));
  42   EXPECT_STREQ(read_buf, HELLO);
  43   ASSERT_THAT(LIBC_NAMESPACE::close(read_fd), Succeeds(0));
  44
  45   ASSERT_THAT(LIBC_NAMESPACE::remove(TEST_FILE), Succeeds(0));
  46 }
  47
  48 TEST(LlvmLibcUniStd, WriteFails) {
  49   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  50
  51   EXPECT_THAT(LIBC_NAMESPACE::write(-1, "", 1), Fails(EBADF));
  52   EXPECT_THAT(LIBC_NAMESPACE::write(1, reinterpret_cast<const void *>(-1), 1),
  53               Fails(EFAULT));
  54 }
  55
  56 TEST(LlvmLibcUniStd, ReadFails) {
  57   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  58
  59   EXPECT_THAT(LIBC_NAMESPACE::read(-1, nullptr, 1), Fails(EBADF));
  60   EXPECT_THAT(LIBC_NAMESPACE::read(0, reinterpret_cast<void *>(-1), 1),
  61               Fails(EFAULT));
  62 }