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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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getdomainname(2) System Calls Manual getdomainname(2)
getdomainname, setdomainname - get/set NIS domain name
Standard C library (libc, -lc)
#include <unistd.h>
int getdomainname(size_t size;
char name[size], size_t size);
int setdomainname(size_t size;
const char name[size], size_t size);
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. More precisely, they operate on the NIS
domain name associated with the calling process's UTS namespace.
setdomainname() sets the domain name to the value given in the
character array name. The size 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 size of size 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 to indicate the error.
setdomainname() can fail with the following errors:
EFAULT name pointed outside of user address space.
EINVAL size 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
equal or longer than size 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).
None.
Since Linux 1.0, the limit on the size of a domain name, including
the terminating null byte, is 64 bytes. In older kernels, it was
8 bytes.
gethostname(2), sethostname(2), uname(2), uts_namespaces(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-06-28 getdomainname(2)
Pages that refer to this page: hostname(1), gethostname(2), syscalls(2), uname(2), capabilities(7), uts_namespaces(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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