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


     getdomainname, setdomainname - get/set NIS 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():
         Since glibc 2.21:
         In glibc 2.19 and 2.20:
             _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
         Up to and including glibc 2.19:
             _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)


     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).


     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 did not have the CAP_SYS_ADMIN capability in the user
            namespace associated with its UTS namespace (see namespaces(7)).
     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 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at

Linux 2017-09-15 GETDOMAINNAME(2)

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