ASSERT(kfile_putc(i, &fd2.fd) != EOF);
ASSERT(kfile_seek(&fd2.fd, 0, KSM_SEEK_SET) == 0);
memset(buf, 0, sizeof(buf));
ASSERT(kfile_read(&fd2.fd, buf, sizeof(buf)) == sizeof(buf));
ASSERT(kfile_putc(i, &fd2.fd) != EOF);
ASSERT(kfile_seek(&fd2.fd, 0, KSM_SEEK_SET) == 0);
memset(buf, 0, sizeof(buf));
ASSERT(kfile_read(&fd2.fd, buf, sizeof(buf)) == sizeof(buf));