getdomainname man page on ElementaryOS

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

NAME
       getdomainname, setdomainname - get/set NIS 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 NIS domain name of
       the host system.

       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 3.54 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				  2012-10-25		      GETDOMAINNAME(2)
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