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fd: make the close method on IOHandle private

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Fd's cache does not handle changes in the state of its IOHandle parameter.
If we allow:

	Fd f;
	f->close();

then Fd ends up caching a pointer to a closed Fd, and will become very
badly confused if a new Fd appears with the same int identifier.

Fix by removing the close method.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2021-04-04 14:17:32 -04:00
parent 06062cfd96
commit 7cffad5fc3
2 changed files with 13 additions and 8 deletions
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2
include/crucible/fd.h
View File

@ -35,11 +35,11 @@ namespace crucible {
IOHandle& operator=(IOHandle &&) = delete;
IOHandle& operator=(const IOHandle &) = delete;
int m_fd;
void close();
public:
virtual ~IOHandle();
IOHandle(int fd = -1);
int get_fd() const;
void close();
};
class Fd {

19
test/fd.cc
View File

@ -37,7 +37,7 @@ test_basic_read()
char read_buf[test_string_len];
read_or_die(f, read_buf);
assert(!strncmp(read_buf, test_string, test_string_len));
f->close();
f = Fd();
}
static
@ -262,24 +262,29 @@ static void test_map()
assert_is_closed(c, false);
}
static void test_close_method()
static void test_close()
{
Fd fd = open("fd.cc", O_RDONLY);
int i = fd;
assert_is_closed(i, false);
fd->close();
fd = Fd();
assert_is_closed(i, true);
}
static void test_shared_close_method()
static void test_shared_close()
{
Fd fd = open("fd.cc", O_RDONLY);
int i = fd;
Fd fd2 = fd;
assert_is_closed(i, false);
assert_is_closed(fd2, false);
fd->close();
fd2 = Fd();
assert_is_closed(i, false);
assert_is_closed(fd, false);
assert_is_closed(fd2, true);
fd = Fd();
assert_is_closed(i, true);
assert_is_closed(fd, true);
assert_is_closed(fd2, true);
}
@ -391,8 +396,8 @@ int main(int, const char **)
RUN_A_TEST(test_assign_int_close());
RUN_A_TEST(test_assign_int_close_2());
RUN_A_TEST(test_map());
RUN_A_TEST(test_close_method());
RUN_A_TEST(test_shared_close_method());
RUN_A_TEST(test_close());
RUN_A_TEST(test_shared_close());
RUN_A_TEST(test_derived_resource_type());
RUN_A_TEST(test_derived_map());
RUN_A_TEST(test_derived_cast());