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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
       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).

       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

       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).

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

       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)

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