GETDOMAINNAME

Section: Linux Programmer's Manual (2)
Updated: 2008-11-27
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NAME

getdomainname, setdomainname - get/set domain name

SYNOPSIS

#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(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)

DESCRIPTION

These functions are used to access or to change the domain name of the current processor.

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 VALUE

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

ERRORS

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 is unprivileged (Linux: does not have the CAP_SYS_ADMIN capability).

getdomainname() can fail with the following errors:

EINVAL: For getdomainname() under libc: name is NULL or name is longer than len bytes.

CONFORMING TO

POSIX does not specify these calls.

NOTES

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).

COLOPHON

This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.