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