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 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-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 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).

SEE ALSO

       gethostname(2), sethostname(2), uname(2)

COLOPHON

       This  page is part of release 3.25 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/.

Linux								    2009-09-27							  GETDOMAINNAME(2)