GETDOMAINNAME(2) Linux Programmer s Manual GETDOMAINNAME(2)

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 charac- ter 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 charac- ter array name, which has a length of len bytes. If the null-termi- nated 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 getdomain- name() 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).

SEE ALSO gethostname(2), sethostname(2), 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

Linux 2008-11-27 GETDOMAINNAME(2)