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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
GETDOMAINNAME(2) Linux Programmer's Manual GETDOMAINNAME(2)
getdomainname, setdomainname - get/set NIS domain name
#include <unistd.h>
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)):
getdomainname(), setdomainname():
Since glibc 2.21:
_DEFAULT_SOURCE
In glibc 2.19 and 2.20:
_DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
Up to and including glibc 2.19:
_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
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 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).
On success, zero is returned. On error, -1 is returned, and errno is
set appropriately.
setdomainname() can fail with the following errors:
EFAULT name pointed outside of user address space.
EINVAL len was negative or too large.
EPERM 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:
EINVAL For getdomainname() under libc: name is NULL or name is longer
than len bytes.
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).
gethostname(2), sethostname(2), uname(2)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2016-10-08 GETDOMAINNAME(2)
Pages that refer to this page: hostname(1), clone(2), gethostname(2), syscalls(2), uname(2), namespaces(7)