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Linux 2.6 - man page for getdomainname (linux section 2)

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 character array name.  The
       len argument specifies the number of bytes in name.  (Thus, name does not require a termi-
       nating 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).

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

COLOPHON
       This page is part of release 3.55 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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