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01 Nov 2017 / Linux vs BSD in a man page

man gethostname on Linux:

The returned name shall be null-terminated, except that if namelen is
an insufficient length to hold the host name, then the returned name
shall be truncated and it is unspecified whether the returned name is
null-terminated.

and

RETURN VALUE
        Upon successful completion, 0 shall be returned; otherwise, −1 shall be returned.

ERRORS
        No errors are defined.

And on OpenBSD:

The returned name is always NUL terminated.

and

ERRORS
     The following errors may be returned by these calls:

     [EFAULT]           The name parameter gave an invalid address.

     [ENOMEM]           The namelen parameter was zero.

     [EPERM]            The caller tried to set the hostname and was not the
                        superuser.