getdomainname(2)

1getdomainname(2)              System Calls Manual             getdomainname(2)
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NAME

6       getdomainname, setdomainname - get/set NIS domain name
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <unistd.h>
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14       int getdomainname(char *name, size_t len);
15       int setdomainname(const char *name, size_t len);
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17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19       getdomainname(), setdomainname():
20           Since glibc 2.21:
21               _DEFAULT_SOURCE
22           In glibc 2.19 and 2.20:
23               _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
24           Up to and including glibc 2.19:
25               _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
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DESCRIPTION

28       These  functions are used to access or to change the NIS domain name of
29       the host system.  More precisely, they operate on the NIS  domain  name
30       associated with the calling process's UTS namespace.
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32       setdomainname()  sets the domain name to the value given in the charac‐
33       ter array name.  The len argument specifies  the  number  of  bytes  in
34       name.  (Thus, name does not require a terminating null byte.)
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36       getdomainname()  returns the null-terminated domain name in the charac‐
37       ter array name, which has a length of len bytes.   If  the  null-termi‐
38       nated domain name requires more than len bytes, getdomainname() returns
39       the first len bytes (glibc) or gives an error (libc).
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RETURN VALUE

42       On success, zero is returned.  On error, -1 is returned, and  errno  is
43       set to indicate the error.
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ERRORS

46       setdomainname() can fail with the following errors:
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48       EFAULT name pointed outside of user address space.
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50       EINVAL len was negative or too large.
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52       EPERM  The caller did not have the CAP_SYS_ADMIN capability in the user
53              namespace associated with its UTS namespace (see namespaces(7)).
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55       getdomainname() can fail with the following errors:
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57       EINVAL For getdomainname() under libc: name is NULL or name  is  longer
58              than len bytes.
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VERSIONS

61       On  most  Linux  architectures  (including x86), there is no getdomain‐
62       name() system call; instead, glibc implements getdomainname() as a  li‐
63       brary  function  that  returns  a copy of the domainname field returned
64       from a call to uname(2).
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STANDARDS

67       None.
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HISTORY

70       Since Linux 1.0, the limit on the length of a  domain  name,  including
71       the  terminating  null  byte,  is 64 bytes.  In older kernels, it was 8
72       bytes.
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