On 11/14/2014 10:50 PM, Mike Holmes wrote:
+       ret = ioctl(sockfd, SIOCSIFMTU, (caddr_t)&ifr);
>+       if (ret) {
 From the ioctl man page
Usually, on success zero is returned.  A few ioctl() requests use the
        return value as an output parameter and return a nonnegative value on
        success.  On error, -1 is returned, and errno is set appropriately.

So in this case you need to check for (-1==ret)


Mike, yes I saw that. But I don't think it's needed for ioctls which I'm using here. I.e. for SIOCSIFMTU and other. I want them to return 0. Any other value is error for that ioctls.

Maxim.

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