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

       getdomainname, setdomainname - get/set domain name

       #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)

       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 speci-
       fies 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).

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

       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.

       POSIX does not specify these calls.

       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

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

       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at

Linux                             2008-11-27                  GETDOMAINNAME(2)