tools/testing/selftests/filesystems/eventfd/eventfd_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/filesystems/eventfd/eventfd_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/filesystems/eventfd/eventfd_test.c
Extension
.c
Size
6295 bytes
Lines
312
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct error {
	int  code;
	char msg[512];
};

static int error_set(struct error *err, int code, const char *fmt, ...)
{
	va_list args;
	int r;

	if (code == 0 || !err || err->code != 0)
		return code;

	err->code = code;
	va_start(args, fmt);
	r = vsnprintf(err->msg, sizeof(err->msg), fmt, args);
	assert((size_t)r < sizeof(err->msg));
	va_end(args);

	return code;
}

static inline int sys_eventfd2(unsigned int count, int flags)
{
	return syscall(__NR_eventfd2, count, flags);
}

TEST(eventfd_check_flag_rdwr)
{
	int fd, flags;

	fd = sys_eventfd2(0, 0);
	ASSERT_GE(fd, 0);

	flags = fcntl(fd, F_GETFL);
	// The kernel automatically adds the O_RDWR flag.
	EXPECT_EQ(flags, O_RDWR);

	close(fd);
}

TEST(eventfd_check_flag_cloexec)
{
	int fd, flags;

	fd = sys_eventfd2(0, EFD_CLOEXEC);
	ASSERT_GE(fd, 0);

	flags = fcntl(fd, F_GETFD);
	ASSERT_GT(flags, -1);
	EXPECT_EQ(flags, FD_CLOEXEC);

	close(fd);
}

TEST(eventfd_check_flag_nonblock)
{
	int fd, flags;

	fd = sys_eventfd2(0, EFD_NONBLOCK);
	ASSERT_GE(fd, 0);

	flags = fcntl(fd, F_GETFL);
	ASSERT_GT(flags, -1);
	EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK);
	EXPECT_EQ(flags & O_RDWR, O_RDWR);

	close(fd);
}

TEST(eventfd_check_flag_cloexec_and_nonblock)
{
	int fd, flags;

	fd = sys_eventfd2(0, EFD_CLOEXEC|EFD_NONBLOCK);
	ASSERT_GE(fd, 0);

	flags = fcntl(fd, F_GETFL);
	ASSERT_GT(flags, -1);
	EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK);
	EXPECT_EQ(flags & O_RDWR, O_RDWR);

	flags = fcntl(fd, F_GETFD);
	ASSERT_GT(flags, -1);
	EXPECT_EQ(flags, FD_CLOEXEC);

	close(fd);
}

static inline void trim_newline(char *str)

Annotation

Implementation Notes