Copyright 1993 Rickard E. Faith (firstname.lastname@example.org) %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since th...
NAMEgetdomainname, setdomainname - get/set NIS domain name
int getdomainname(char *name, size_t len);
int setdomainname(const char *name, size_t len);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
- _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
DESCRIPTIONThese 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 name. The len argument specifies the number of bytes in name. (Thus, 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).
RETURN VALUEOn success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORSsetdomainname() can fail with the following errors:
- name pointed outside of user address space.
- len was negative or too large.
- the caller is unprivileged (Linux: does not have the CAP_SYS_ADMIN capability).
getdomainname() can fail with the following errors:
- For getdomainname() under libc: name is NULL or name is longer than len bytes.
CONFORMING TOPOSIX does not specify these calls.
NOTESSince 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).