getdomainname, setdomainname - get/set NIS domain name
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
These functions are used to access or to change the NIS domain name of the host system.
setdomainname() sets the domain name to the value given in the character array
len argument specifies the number of bytes in
name does not require a terminating null byte.)
getdomainname() returns the null-terminated domain name in the character array
name, which has a length of
len bytes. If the null-terminated domain name requires more than
len bytes, getdomainname() returns the first
len bytes (glibc) or gives an error (libc).
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
setdomainname() can fail with the following errors:
name pointed outside of user address space.
len was negative or too large.
The caller did not have the CAP_SYS_ADMIN capability in the user namespace associated with its UTS namespace (see namespaces(7)).
getdomainname() can fail with the following errors:
For getdomainname() under libc:
name is NULL or
name is longer than
POSIX does not specify these calls.
Since Linux 1.0, the limit on the length of a domain name, including the terminating null byte, is 64 bytes. In older kernels, it was 8 bytes.
On most Linux architectures (including x86), there is no getdomainname() system call; instead, glibc implements getdomainname() as a library function that returns a copy of the
domainname field returned from a call to uname(2).
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