[PATCH v4] nvme/069: add a test for multipath cdev lifetime

[Nilay Shroff]

On 7/16/26 10:06 PM, John Garry wrote:
> On 16/07/2026 16:16, Nilay Shroff wrote:
>>> +    kill(getppid(), SIGUSR2);
>>> +    count = 0;
>>> +    for (;;) {
>>> +        fd1 = open(argv[1], O_RDONLY);
>>> +        usleep(500000);
>>> +        if (fd1 < 0)
>>> +            break;
>>
>> Does it make sense to check for errno set to ENODEV or ENOENT
>> before breaking out here?
> 
> ehh, if the errno is not ENODEV or ENOENT, then how to handle? Would it to fail the test due to unexpected errno?

I think yes, something like below:

for (;;) {
         fd1 = open(argv[1], O_RDONLY);
         if (fd1 < 0) {
                 if (errno == EINTR)
                         continue;

                 if (errno == ENOENT || errno == ENODEV)
                         break;

                 perror("open");
                 return EINVAL;
         }

         close(fd1);
         usleep(500000);

         if (++count > 10) {
                 fprintf(stderr, "%s still present\n", argv[0]);
                 return EINVAL;
         }
}

Thanks,
--Nilay