test_write
__u8 test_write : 1;
__u8 test_write : 1;
test_write("/dev/null", buf, TEST_BUFFER_SIZE,
test_write("/dev/zero", buf, TEST_BUFFER_SIZE, -1, EPERM);
.write = test_write,
ssize_t test_write(int fd, const void *buf, size_t count);