ladybird/Tests/LibC/TestIo.cpp
Andrew Kaster 2ca1193d9a Userland+Tests: Convert test_io to be LibTest based
Add a few extra tests as well, to make sure we don't have any future
TmpFs regressions.
2021-07-11 19:42:00 +02:00

396 lines
11 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Andrew Kaster <akaster@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/Types.h>
#include <LibCore/File.h>
#include <LibTest/TestCase.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>
#define EXPECT_ERROR_2(err, syscall, arg1, arg2) \
do { \
rc = syscall(arg1, arg2); \
EXPECT(rc < 0); \
EXPECT_EQ(errno, err); \
if (rc >= 0 || errno != err) { \
warnln(__FILE__ ":{}: Expected " #err ": " #syscall "({}, {}), got rc={}, errno={}", __LINE__, arg1, arg2, rc, errno); \
} \
} while (0)
#define EXPECT_ERROR_3(err, syscall, arg1, arg2, arg3) \
do { \
rc = syscall(arg1, arg2, arg3); \
EXPECT(rc < 0); \
EXPECT_EQ(errno, err); \
if (rc >= 0 || errno != err) { \
warnln(__FILE__ ":{}: Expected " #err ": " #syscall "({}, {}, {}), got rc={}, errno={}", __LINE__, arg1, arg2, arg3, rc, errno); \
} \
} while (0)
TEST_CASE(read_from_directory)
{
char buffer[BUFSIZ];
int fd = open("/", O_DIRECTORY | O_RDONLY);
VERIFY(fd >= 0);
int rc;
EXPECT_ERROR_3(EISDIR, read, fd, buffer, sizeof(buffer));
rc = close(fd);
VERIFY(rc == 0);
}
TEST_CASE(write_to_directory)
{
char str[] = "oh frick";
int fd = open("/", O_DIRECTORY | O_RDONLY);
if (fd < 0)
perror("open");
VERIFY(fd >= 0);
int rc;
EXPECT_ERROR_3(EBADF, write, fd, str, sizeof(str));
rc = close(fd);
VERIFY(rc == 0);
}
TEST_CASE(read_from_writeonly)
{
char buffer[BUFSIZ];
int fd = open("/tmp/xxxx123", O_CREAT | O_WRONLY);
VERIFY(fd >= 0);
int rc;
EXPECT_ERROR_3(EBADF, read, fd, buffer, sizeof(buffer));
rc = close(fd);
VERIFY(rc == 0);
rc = unlink("/tmp/xxxx123");
VERIFY(rc == 0);
}
TEST_CASE(write_to_readonly)
{
char str[] = "hello";
int fd = open("/tmp/abcd123", O_CREAT | O_RDONLY);
VERIFY(fd >= 0);
int rc;
EXPECT_ERROR_3(EBADF, write, fd, str, sizeof(str));
rc = close(fd);
VERIFY(rc == 0);
rc = unlink("/tmp/abcd123");
VERIFY(rc == 0);
}
TEST_CASE(read_past_eof)
{
char buffer[BUFSIZ];
int fd = open("/home/anon/README.md", O_RDONLY);
if (fd < 0)
perror("open");
VERIFY(fd >= 0);
int rc;
rc = lseek(fd, 99999, SEEK_SET);
if (rc < 0)
perror("lseek");
rc = read(fd, buffer, sizeof(buffer));
if (rc < 0)
perror("read");
if (rc > 0)
warnln("read {} bytes past EOF", rc);
rc = close(fd);
VERIFY(rc == 0);
}
TEST_CASE(ftruncate_readonly)
{
int fd = open("/tmp/trunctest", O_RDONLY | O_CREAT, 0666);
VERIFY(fd >= 0);
int rc;
EXPECT_ERROR_2(EBADF, ftruncate, fd, 0);
rc = close(fd);
VERIFY(rc == 0);
rc = unlink("/tmp/trunctest");
VERIFY(rc == 0);
}
TEST_CASE(ftruncate_negative)
{
int fd = open("/tmp/trunctest", O_RDWR | O_CREAT, 0666);
VERIFY(fd >= 0);
int rc;
EXPECT_ERROR_2(EINVAL, ftruncate, fd, -1);
rc = close(fd);
VERIFY(rc == 0);
rc = unlink("/tmp/trunctest");
VERIFY(rc == 0);
}
TEST_CASE(mmap_directory)
{
int fd = open("/tmp", O_RDONLY | O_DIRECTORY);
VERIFY(fd >= 0);
auto* ptr = mmap(nullptr, 4096, PROT_READ, MAP_FILE | MAP_SHARED, fd, 0);
EXPECT_EQ(ptr, MAP_FAILED);
if (ptr != MAP_FAILED) {
warnln("Boo! mmap() of a directory succeeded!");
}
EXPECT_EQ(errno, ENODEV);
if (errno != ENODEV) {
warnln("Boo! mmap() of a directory gave errno={} instead of ENODEV!", errno);
return;
}
close(fd);
}
TEST_CASE(tmpfs_read_past_end)
{
int fd = open("/tmp/x", O_RDWR | O_CREAT | O_TRUNC, 0600);
VERIFY(fd >= 0);
int rc = ftruncate(fd, 1);
VERIFY(rc == 0);
rc = lseek(fd, 4096, SEEK_SET);
VERIFY(rc == 4096);
char buffer[16];
int nread = read(fd, buffer, sizeof(buffer));
if (nread != 0) {
warnln("Expected 0-length read past end of file in /tmp");
}
rc = close(fd);
VERIFY(rc == 0);
rc = unlink("/tmp/x");
VERIFY(rc == 0);
}
TEST_CASE(procfs_read_past_end)
{
int fd = open("/proc/uptime", O_RDONLY);
VERIFY(fd >= 0);
int rc = lseek(fd, 4096, SEEK_SET);
VERIFY(rc == 4096);
char buffer[16];
int nread = read(fd, buffer, sizeof(buffer));
if (nread != 0) {
warnln("Expected 0-length read past end of file in /proc");
}
close(fd);
}
TEST_CASE(open_create_device)
{
int fd = open("/tmp/fakedevice", (O_RDWR | O_CREAT), (S_IFCHR | 0600));
VERIFY(fd >= 0);
struct stat st;
int rc = fstat(fd, &st);
EXPECT(rc >= 0);
if (rc < 0) {
perror("stat");
}
EXPECT_EQ(st.st_mode, 0100600);
if (st.st_mode != 0100600) {
warnln("Expected mode 0100600 after attempt to create a device node with open(O_CREAT), mode={:o}", st.st_mode);
}
rc = unlink("/tmp/fakedevice");
EXPECT_EQ(rc, 0);
close(fd);
EXPECT_EQ(rc, 0);
}
TEST_CASE(unlink_symlink)
{
int rc = symlink("/proc/2/foo", "/tmp/linky");
EXPECT(rc >= 0);
if (rc < 0) {
perror("symlink");
}
auto target = Core::File::read_link("/tmp/linky");
EXPECT_EQ(target, "/proc/2/foo");
rc = unlink("/tmp/linky");
EXPECT(rc >= 0);
if (rc < 0) {
perror("unlink");
warnln("Expected unlink() of a symlink into an unreadable directory to succeed!");
}
}
TEST_CASE(tmpfs_eoverflow)
{
int fd = open("/tmp/x", O_RDWR | O_CREAT);
EXPECT(fd >= 0);
off_t rc = lseek(fd, INT64_MAX, SEEK_SET);
EXPECT_EQ(rc, INT64_MAX);
char buffer[16] {};
char empty_buffer[16] {};
rc = read(fd, buffer, sizeof(buffer));
EXPECT_EQ(rc, -1);
EXPECT_EQ(errno, EOVERFLOW);
[[maybe_unused]] auto ignored = strlcpy(buffer, "abcdefghijklmno", sizeof(buffer) - 1);
rc = write(fd, buffer, sizeof(buffer));
EXPECT_EQ(rc, -1);
EXPECT_EQ(errno, EOVERFLOW);
if (rc >= 0 || errno != EOVERFLOW) {
warnln("Expected EOVERFLOW when trying to write past INT64_MAX");
}
// ok now, write something to it, and try again
rc = lseek(fd, 0, SEEK_SET);
EXPECT_EQ(rc, 0);
rc = write(fd, buffer, sizeof(buffer));
EXPECT_EQ(rc, 16);
rc = lseek(fd, INT64_MAX, SEEK_SET);
EXPECT_EQ(rc, INT64_MAX);
memset(buffer, 0, sizeof(buffer));
rc = read(fd, buffer, sizeof(buffer));
EXPECT_EQ(rc, -1);
EXPECT_EQ(errno, EOVERFLOW);
if (rc >= 0 || errno != EOVERFLOW) {
warnln("Expected EOVERFLOW when trying to read past INT64_MAX");
}
EXPECT_EQ(0, memcmp(buffer, empty_buffer, sizeof(buffer)));
rc = close(fd);
EXPECT_EQ(rc, 0);
rc = unlink("/tmp/x");
EXPECT_EQ(rc, 0);
}
TEST_CASE(tmpfs_massive_file)
{
int fd = open("/tmp/x", O_RDWR | O_CREAT);
EXPECT(fd >= 0);
off_t rc = lseek(fd, INT32_MAX, SEEK_SET);
EXPECT_EQ(rc, INT32_MAX);
char buffer[16] {};
rc = read(fd, buffer, sizeof(buffer));
EXPECT_EQ(rc, 0);
[[maybe_unused]] auto ignored = strlcpy(buffer, "abcdefghijklmno", sizeof(buffer) - 1);
rc = write(fd, buffer, sizeof(buffer));
EXPECT_EQ(rc, -1);
EXPECT_EQ(errno, ENOMEM);
// ok now, write something to it, and try again
rc = lseek(fd, 0, SEEK_SET);
EXPECT_EQ(rc, 0);
rc = write(fd, buffer, sizeof(buffer));
EXPECT_EQ(rc, 16);
rc = lseek(fd, INT32_MAX, SEEK_SET);
EXPECT_EQ(rc, INT32_MAX);
// FIXME: Should this return EOVERFLOW? Or is a 0 read fine?
memset(buffer, 0, sizeof(buffer));
rc = read(fd, buffer, sizeof(buffer));
EXPECT_EQ(rc, 0);
EXPECT(buffer != "abcdefghijklmno"sv);
rc = close(fd);
EXPECT_EQ(rc, 0);
rc = unlink("/tmp/x");
EXPECT_EQ(rc, 0);
}
TEST_CASE(rmdir_while_inside_dir)
{
int rc = mkdir("/home/anon/testdir", 0700);
VERIFY(rc == 0);
rc = chdir("/home/anon/testdir");
VERIFY(rc == 0);
rc = rmdir("/home/anon/testdir");
VERIFY(rc == 0);
int fd = open("x", O_CREAT | O_RDWR, 0600);
EXPECT(fd < 0);
EXPECT_EQ(errno, ENOENT);
if (fd >= 0 || errno != ENOENT) {
warnln("Expected ENOENT when trying to create a file inside a deleted directory. Got {} with errno={}", fd, errno);
}
rc = chdir("/home/anon");
VERIFY(rc == 0);
}
TEST_CASE(writev)
{
int pipefds[2];
int rc = pipe(pipefds);
EXPECT(rc == 0);
iovec iov[2];
iov[0].iov_base = const_cast<void*>((const void*)"Hello");
iov[0].iov_len = 5;
iov[1].iov_base = const_cast<void*>((const void*)"Friends");
iov[1].iov_len = 7;
int nwritten = writev(pipefds[1], iov, 2);
EXPECT_EQ(nwritten, 12);
if (nwritten < 0) {
perror("writev");
}
if (nwritten != 12) {
warnln("Didn't write 12 bytes to pipe with writev");
}
char buffer[32] {};
int nread = read(pipefds[0], buffer, sizeof(buffer));
EXPECT_EQ(nread, 12);
EXPECT_EQ(buffer, "HelloFriends"sv);
if (nread != 12 || memcmp(buffer, "HelloFriends", 12)) {
warnln("Didn't read the expected data from pipe after writev");
VERIFY_NOT_REACHED();
}
close(pipefds[0]);
close(pipefds[1]);
}
TEST_CASE(rmdir_root)
{
int rc = rmdir("/");
EXPECT_EQ(rc, -1);
EXPECT_EQ(errno, EBUSY);
if (rc != -1 || errno != EBUSY) {
warnln("rmdir(/) didn't fail with EBUSY");
}
}
TEST_CASE(open_silly_things)
{
int rc = -1;
EXPECT_ERROR_2(ENOTDIR, open, "/dev/zero", (O_DIRECTORY | O_RDONLY));
EXPECT_ERROR_2(EINVAL, open, "/dev/zero", (O_DIRECTORY | O_CREAT | O_RDWR));
EXPECT_ERROR_2(EEXIST, open, "/dev/zero", (O_CREAT | O_EXCL | O_RDWR));
EXPECT_ERROR_2(EINVAL, open, "/tmp/abcdef", (O_DIRECTORY | O_CREAT | O_RDWR));
EXPECT_ERROR_2(EACCES, open, "/proc/all", (O_RDWR));
EXPECT_ERROR_2(ENOENT, open, "/boof/baaf/nonexistent", (O_CREAT | O_RDWR));
EXPECT_ERROR_2(EISDIR, open, "/tmp", (O_DIRECTORY | O_RDWR));
EXPECT_ERROR_2(EPERM, link, "/", "/home/anon/lolroot");
}